JP3198208B2 - Cutting jig for cylindrical work, positioning jig between cylindrical work and cutting jig, chip processing method, and cutting tool for cylindrical work - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting jig used for cutting an inner diameter of a cylindrical work having an inner diameter reference hole, a positioning jig for the cutting jig, a cutting method, and a cutting tool.

[0002]

2. Description of the Related Art In general, in order to obtain high machining accuracy in the inner diameter cutting of a cylindrical work having an inner diameter reference hole, the work is rotated around a shaft center of the reference hole by a rotating means. It is necessary to perform cutting by bringing a blade attached to a tool shank into contact with the inner diameter. When rotating the cylindrical work around the axis of the reference hole, it is necessary to chuck the reference hole of the cylindrical work by the rotating means. However, a cutting jig for chucking the inner diameter reference hole of the cylindrical work is required. Various tools, positioning jigs for positioning a cylindrical work on the cutting jig, and cutting methods and cutting tools for discharging chips generated during cutting to the outside of the cylindrical work have been considered.

FIG. 30 is a cross-sectional view showing the structure of a conventional cutting tool of this type. In the figure, 1 is a cylindrical work having an inner diameter reference hole 1a, 2 is fitted into the inner diameter reference hole 1a of the cylindrical work 1, and tapered portions 2a and 2b are formed on inner circumferential surfaces of both ends, and both ends are formed. A cylindrical collet in which a plurality of slits (not shown) extending in the axial direction from the cylindrical collet are formed in the circumferential direction, and 3 are tapered center holes 3a and 3b at both end surfaces.
Is a rod-shaped chuck body on which a collet 2 is partially formed.
And a threaded portion 3d is formed on the small diameter side of the tapered outer peripheral portion 3c, that is, on the outer peripheral surface on the side where the center hole 3b is formed. Reference numeral 4 denotes a tapered cone which is slidably fitted to the chuck body 3, has a tapered outer peripheral portion 4 a fitted at one end to the tapered portion 2 b of the collet 2, and has an engaging hole 4 b formed on the side surface. A collar slidably fitted to the chuck body 3 from the other end of the tapered cone 4, a nut 6 screwed into the screw portion 3 d of the chuck body 3, 7 is an end of the tapered cone 4 on the outer periphery of the chuck body 3. Reference numeral 8 denotes a set screw which is disposed in the engagement hole 4 b of the tapered cone 4 and is fixed to the chuck body 3.

Next, the operation of the conventional cutting jig configured as described above will be described. First, the cylindrical work 1 is inserted into the outer peripheral side of the cutting jig with the collar 5 and the nut 6 removed, and the cylindrical work 1 and the cutting jig are connected to each other when the inner diameter reference hole 1a and the collet 2 match. Relative positioning is performed. Next, the collar 5 is inserted into the chuck body 3, and the nut 6 is screwed. When the nut 6 is further tightened, the tightening thrust is applied via the collar 5 to the tapered cone 4.
And the tapered outer peripheral portion 4 a of the tapered cone 4 is slidably inserted into the tapered portion 2 b of the collet 2. At the same time, the tapered portion 2a of the collet 2 slides on the tapered outer peripheral portion 3c of the chuck body 3, and the tapered outer peripheral portion 3c of the chuck body 3 is relatively inserted into the tapered portion 2a of the collet 2. As a result, the collet 2 is expanded in the radial direction, the outer diameter is pressed against the inner diameter reference hole 1a, and the cylindrical work 1 is expanded.
Is fixed to the cutting jig. In this state, the compression coil spring 7 is compressed by the tapered cone 4. When the cutting process is completed and the nut 6 is loosened, the compression coil spring 7 expands, and the tapered cone 4 is pushed back until the side surface of the engagement hole 4b comes into contact with the set screw 8, so that the collet 2 is reduced and the cylindrical workpiece 1 is reduced. Is released.

FIG. 31 is a cross-sectional view showing the configuration of another different conventional cutting tool. In the figure, the same parts as those shown in FIG. 30 are denoted by the same reference numerals, and description thereof will be omitted. Reference numeral 9 denotes a rod-shaped chuck body having tapered center holes 9a and 9b formed at both end surfaces. A hole 9c is formed in the axial center portion from the center hole 9a side to near the center in the axial direction. A screw hole 9d is formed at a connection portion with the hole 9a, and a small-diameter portion 9e is formed at an outer peripheral portion near a central portion in the axial direction. Reference numeral 10 denotes a slidable piston fitted into the hole 9c of the chuck main body 9, reference numeral 11 denotes a screw which comes into contact with the piston 10 and is screwed into the screw hole 9d, and reference numeral 12 denotes a small-diameter portion 9e of the chuck main body 9. A thin metal cylinder that covers
And the void 13 is formed. And this gap 1
Reference numeral 3 communicates with the inside of the hole 9c of the chuck body 9, and the inside is filled with oil.

Next, the operation of the conventional cutting jig configured as described above will be described. First, when the screw 11 is tightened, the tightening thrust is urged through the piston 10 to the oil filled in the hole 9c and the gap 13 communicating with the hole 9c, and the urging force causes the metal cylinder 12 to expand in the radial direction. Then, the outer diameter is pressed by the reference hole 1a of the cylindrical work 1, and the cylindrical work 1 is fixed to the cutting jig. When the screw 11 is loosened after the cutting process is completed, the metal cylinder 12 contracts and returns to the original diameter, and the cylindrical workpiece 1 is no longer pressed against the reference hole 1a, and the cylindrical workpiece is released.

FIG. 32 is a cross-sectional view showing the configuration of a third different conventional cutting jig. In the figure, the same parts as those of the cutting jig shown in FIG. 30 are denoted by the same reference numerals, and description thereof is omitted. Reference numeral 14 denotes a rotating center which is fixed to the lathe main shaft 15 and which fits a tapered portion 14a formed at the tip into a center hole 3a of the chuck body 3 to support one end of the chuck body 3, and 16 denotes a tailstock ( (Not shown), and is a stop center that supports the other end of the chuck body 3 by fitting the tapered portion 16a into the center hole 3b of the chuck body 3.

Reference numeral 17 denotes a ring-shaped disc-shaped member fixed to the lathe main shaft 15 by bolting, 18 denotes a rotation transmitting rod projecting from the outer periphery of the disc-shaped member 17, and 19 denotes one end of the main body chuck 3. A rotation transmission plate fitted to the side and fixed by a set screw 20 has a flange portion 19b having a notch 19a at one end where the rotation transmission rod 18 is engaged. Reference numeral 21 denotes a temporary receiving table on which the cylindrical work 1 is placed before and after cutting. The centers of both center holes 3a and 3b of the chuck body 3 integrated with the cylindrical work 1 are located at both centers 1 of the lathe.
The height is adjusted so as to be located slightly vertically below the center of the tip of 4, 4.

Next, the operation of the third conventional cutting jig configured as described above will be described. First, the cylindrical workpiece 1 in the same manner as shown in FIG. 30 is integrally fixed to the chuck body 3, the rotation transmission plate 19 is fixed by the set screw 20 is fitted to one end of the chuck body 3. Next, the notch 19a of the rotation transmission rod 18 and the rotation transmission plate 19
The integrated cylindrical work 1 and chuck body 3 are placed on the temporary receiving table 21 so that the positions of the cylindrical work 1 and the chuck body 3 coincide with each other. At this time, the stop center 16 has been retracted,
A space in which the chuck body 3 and the cylindrical work 1 are placed is provided between the chuck body 3 and the rotation center 14.

Next, the stop center 16 is moved forward to slide into the center hole 3b of the chuck body 3, and the chuck body 3 and the cylindrical work 1 are moved to the lathe spindle while being lifted there. Then, the center hole 3a of the chuck body 3 rotates and slides on the center 14, where the chuck body 3 and the cylindrical work 1 are lifted and separated from the temporary receiving table 21. At the same time, the rotation transmission rod 18 and the rotation transmission plate 19 are engaged in the notch 19a. An appropriate thrust is given to the stop center 16, which causes the center holes 3 a, 3 a
b, the stop center 16 and the rotation center 14 are pressed against each other, and the chuck body 3 and the cylindrical workpiece 1
6 supported. In this state, the lathe spindle 15 is rotated, and the rotational power is transmitted to the cylindrical workpiece 1 via the disk-shaped member 17, the rotation transmission rod 18, the rotation transmission plate 19, and the chuck body 3, and the rotation of the chuck body 3 is performed. The cylindrical workpiece 1 is rotated about an axis connecting the centers of both center holes 3a, 3b and the centers of both contact surfaces of the centers 14, 16 of the lathe.

FIG. 33 is a sectional view showing the structure of a fourth different conventional cutting tool. In the figure, portions similar to those of the cutting jig shown in FIG. 32 are denoted by the same reference numerals, and description thereof is omitted. Reference numeral 22 denotes a power chuck coaxially mounted on the lathe spindle 15, and a plurality of claws 22a which are opened and closed in a radial direction by a hydraulic mechanism (not shown) are provided at equal pitches on a circumference centered on the axis. Have been. As a method for regulating the position of the chuck body 3 in the lathe rotation axis direction, a power chuck 22 is provided with a rotation center coaxially with one end thereof to support the chuck body 3, and a claw 22 a is provided with the rotation center of the chuck body 3. One that forms a stepped portion having an end face that abuts on one end face has been considered.

Next, the operation of the fourth conventional cutting tool configured as described above will be described. First, in the case where the power chuck 22 is provided with a rotation center (not shown) for supporting one end of the chuck body 3 coaxially therewith, FIG.
After the chuck body 3 and the cylindrical work 1 are supported by the turning center and the stop center 16 in the same manner as shown in FIG. Rotates, and the cylindrical work 1 is rotated together with the chuck body 3.

In the case of forming a stepped portion having an end face abutting on one end face of the chuck main body 3 on the claw 22a, the chuck main body placed on the temporary receiving table 21 in the same manner as shown in FIG. The chuck 3 and the cylindrical work 1 are stopped and moved toward the lathe spindle 15 while being lifted by the center 16, so that one end surface of the chuck main body 3 is brought into contact with the stepped end surface of the claw 22a with an inclination. At this time, the side surface of each stepped portion of the claw 22a is equidistant from the axis of the power chuck 22, and is located at a position where a small clearance is formed between the outer diameter of one end of the chuck main body 3 and the clearance. Next, the claw 22a is closed, the inclination of the one end surface of the chuck body 3 with respect to the end surface of the step portion of the claw 22a is corrected by the stepped portion side surface, and the outer diameter of one end of the chuck body 3 is gripped. When the lathe spindle 15 is rotated in this state, the chuck body 3 is rotated.
The cylindrical work 1 is rotated about an axis connecting the outer diameter of one end of the hook 22a to the contact surface of the stepped portion side surface of the claw 22a and the center of the contact surface of the chuck body 3a with the center hole 3b and the stop center 16.

FIG. 34 is a sectional view showing the structure of a fifth different conventional cutting jig. In the figures, FIGS.
The same parts as those in the cutting jig shown in FIG. Reference numeral 23 denotes a cylindrical member having one end coaxially attached to the lathe main shaft 15, a tapered outer peripheral portion 23 a fitted to the tapered portion 2 a of the collet 2 at the other end, and a through hole 23 b formed in the shaft center. , 24 are shaft members which are slidably fitted in the through holes 23b of the cylindrical member 23. A center hole 24a which stops at the end face and fits with the tapered portion 16a of the center 16 is formed on one end side. In addition, a tapered outer peripheral portion 24b fitted to the tapered portion 2b of the collet 2 is formed on the outer peripheral surface, and the other end is connected to a hydraulic draw bar 25 pushed and pulled by a mechanism (not shown). Then, these cylindrical member 23 and shaft member 2
4 constitute the chuck body 26.

Next, the operation of the fifth conventional cutting tool configured as described above will be described. First, with the stop center 16 retracted, the cylindrical work 1 is inserted into the chuck body 26 by a mechanism (not shown), and the cylindrical work 1
Is positioned where the inner diameter reference hole 1a and the collet 2 match. Next, when the shaft member 24 is pulled in via a hydraulic draw bar 25 by a mechanism (not shown), the tapered outer peripheral portion 24 b of the shaft member 24 is slidably inserted into the tapered portion 2 b of the collet 2. At the same time, the tapered portion 2a of the collet 2 is slidably fitted on the tapered outer peripheral portion 23a of the cylindrical member 23, and the tapered outer peripheral portion 23a is relatively inserted into the tapered portion 2a of the collet 2. As a result, the collet 2 is expanded in the radial direction, the outer diameter is pressed against the reference hole 1a of the cylindrical work 1, and the cylindrical work 1 is fixed to the cutting jig. Further, the stop center 16 is advanced, and one end of the shaft-shaped member 24 is supported by the stop center 15 via the center hole 24a. When the lathe spindle 15 rotates in this state, the cylindrical work 1 is rotated about the axis of the lathe spindle 15.

In general, in the inner diameter cutting of a cylindrical work having an inner diameter reference hole, especially when the cut portion is thin, or the inner diameter of the cut portion is larger than the diameter of the inner diameter reference hole, or is relatively long and relatively thin. In the case of, cutting chatter occurs due to self-excited vibration of the thin portion of the cylindrical work, and the machining accuracy is significantly reduced. Is applied to the outside diameter of the thin portion of the cylindrical work, and one end is hooked or weighted to any one so that the thin portion of the cylindrical work is temporarily thickened so as not to be caught in the cylindrical work during cutting. By increasing rigidity and weight, the natural frequency is reduced to suppress self-excited vibration.

In a seventh different conventional cutting tool, a rubber band is wound around the outer diameter of a thin portion of a cylindrical work (not shown) so that self-excited vibration is suppressed by a damper function of the rubber band. ing.

Further, in the inner diameter cutting of a cylindrical work having an inner diameter reference hole, chips are entangled with the chuck main body, which may hinder the separation between the cylindrical work and the chuck main body . In the case of a tool or the like, since the cutting adheres between the collet 2 and the inner diameter of the cylindrical work 1, thereby impairing the chuck accuracy and the chucking force, chips are introduced inside from the end of the cutting portion of the inner diameter of the cylindrical work. It is necessary to prevent intrusion.

FIG. 35 is a cross-sectional view showing the structure of a chip cover provided on an eighth different conventional cutting jig for preventing chips from entering the inside of a cylindrical workpiece as described above. In the drawing, reference numeral 27 is provided near the end of cutting the inner diameter of the cylindrical work. For example, in the case of the cutting jig shown in FIG.
Is a disk-shaped member whose outer diameter is slightly smaller than the inner diameter of the cylindrical work.
Is fixed to one end surface of the chip by a countersunk screw 29, and a chip cover 30 is constituted by these 27 to 29.

The chip cover 30 constructed as described above
Is disposed at a position where the outer diameter portion of the disc-shaped member 28 is slightly inside the cutting portion end of the inner diameter of the cylindrical work, so that chips generated during cutting enter the inside of the cylindrical work. prevent.

FIG. 36 is a sectional view showing the structure of a chip cover provided on a ninth conventional cutting tool for preventing chips from entering the inside of a cylindrical work as described above. In the figure, reference numeral 31 is disposed near the end of cutting the inner diameter of the cylindrical work . For example, in the case of the cutting jig shown in FIG.
The ring 32 is formed with an outer diameter slightly larger than the inner diameter of the cylindrical work, and a rubber plate disposed in contact with one end surface of the ring 31 is a rubber plate 33 having an outer diameter of the rubber plate 32. It is formed smaller than the outer diameter, and a rubber plate 32
, And is fixed to one end surface of the ring 31 with a countersunk screw 34.
Is configured.

The chip cover 35 constructed as described above
Is a rubber plate 32 similar to the chip cover 30 shown in FIG.
Is disposed at a position where the outer diameter portion of the inside of the cylindrical work is slightly inside from the end of the chip portion of the inner diameter of the cylindrical work, thereby preventing chips generated during cutting from entering the inside of the cylindrical work. Since the outer diameter is in contact with the entire inner circumference of the cylindrical work, the intrusion of the swarf crushed into powder is also prevented.

Also, in the case of internal diameter cutting of a cylindrical work having an internal diameter reference hole, especially in the case where automation of cutting is performed by an NC lathe or the like, the position of the cylindrical work in the lathe is strictly determined in order to obtain necessary dimensional accuracy of the cut portion. Need to be managed. The position of the chuck body is such that the center hole provided in the chuck body fits around the center of the lathe, one end surface of the chuck body abuts the stepped end surface of the power chuck claw, or the chuck body is directly In particular, determining the relative position of the cylindrical work with respect to the chuck body poses a problem.

FIG. 37 is a view showing the structure of a conventional positioning jig of this type. In the figure, the cutting jig is shown in FIG.
And the same reference numerals are given, and the description is omitted. Reference numeral 36 denotes a plurality of claws of a vice or scroll chuck, and an upper surface 36a on which the cylindrical workpiece 1 is placed, a stepped end surface 36b with which the stepped end surface 3e of the chuck body 3 is in contact, and one end of the chuck body 3 Side surface 36 contacting the outer diameter
c.

Next, the operation of the conventional positioning jig configured as described above will be described. First, one end of the chuck body 3 is inserted into the claw 36 in a state where the claw 36 is opened so that a slight gap is formed between the outer diameter of one end of the chuck body 3 and the side surface 36c of the claw 36, and the stepped portion is formed. The end face 3e is brought into contact with the stepped end face 36b of the claw 36, and the chuck body 3 is placed on the claw 36. Next, the pawl 36 is closed and the chuck body 3 is fixed. Further, the cylindrical work 1 is inserted into the chuck body 3 and placed on the upper surface 36 a of the claw 36. Then, the cylindrical work 1 is chucked by the chuck body 3 in this state, and the relative position of the cylindrical work 1 with respect to the chuck body 3 is determined.

FIG. 38 is a view showing the structure of a different conventional positioning jig. In the figure, the cutting jig is the same as that shown in FIG. 37 is fitted to the chuck body 3, one end of which abuts against the stepped end face 3f of the chuck body 3 and is fixed to the chuck body 3, the outer diameter of which is fitted to the inner diameter of the cylindrical work 1; The end face 1b of the cylindrical work 1 has an inner diameter step.
Is a cylindrical member as a positioning jig which is brought into contact with the member.

In the different conventional positioning jigs constructed as described above, the cylindrical work 1 is inserted into the chuck body 3 on which the cylindrical member 37 is fixed and integrated, and the stepped end face of the cylindrical work 1 has an inner diameter. In a state where 1b is in contact with the other end surface of the cylindrical member 37, the position of the cylindrical work 1 with respect to the chuck body 3 is determined and held.

FIG. 39 is a view showing the structure of a third different conventional positioning jig. In the figure, the cutting jig is the same as that shown in FIG. Reference numeral 38 is fitted to the chuck body 3, one end face is abutted on the stepped end face 3 f of the chuck body 3 and is fixed to the chuck body 3, and the other end face is abutted on one end face of the cylindrical workpiece 1. It is a cylindrical member as a positioning jig.

In the third conventional positioning tool having the above-described configuration, the cylindrical work 1 is inserted into the chuck body 3 in which the cylindrical member 38 is fixedly integrated, and the cylindrical work 1 is inserted into the chuck body 3. With the end surface in contact with the other end surface of the cylindrical member 38, the cylindrical work 1 is
Is determined and held. Note that FIG.
The positioning jig shown in FIG. 1 is applied when only one inner diameter of the cylindrical work 1 is cut.

In the case of cutting the inside diameter of a cylindrical work having an inside diameter reference hole, chips generated during cutting stick to the chuck body and the cutting tool, which hinders the cutting operation. There is. Conventionally, as this type of chip processing method, a barrier called a chip breaker is provided near the cutting edge of a blade, or a groove or a projection is provided near a corner of the cutting edge by finely cutting the cutting edge so that chips flowing out are curvedly deformed. A method of mechanically cutting chips by applying vibration to the workpiece or cutting tool during cutting, changing the angle of the cutting edge, or periodically applying an impact to the chip with a rotating body, and applying a pair of electrodes to the chip. How to burn with Joule heat,
Various methods have been considered, such as a method in which a fluid is jetted to the tip of a blade to apply a break force to the chips to curl the chips to separate them.

FIGS. 40 and 41 show, for example, Japanese Patent Publication No.
BRIEF DESCRIPTION OF THE DRAWINGS It is the top view of the conventional cutting tool shown by 44544 gazette, and the front view which made a part into section. In the figure, 39
Is a bite shank provided with a concave portion 39a at the front part;
Is a square super-hard material blade attached to the recess 39a of the bite shank 39 via a floor plate 41, and 42 can rotate around the tip of the blade 40 so that the distance from the tip of the blade 40 can be varied. A fan-shaped nozzle attached to the bite shank 39, 43 is a fluid supply pipe attached to the rear part of the sector-shaped nozzle 42, 44 is connected to the fluid supply pipe 43, and is a nozzle outlet formed in the sector-shaped nozzle 42 and ejecting fluid. It is.

In the conventional cutting tool configured as described above, the fluid supplied from the fluid supply pipe 43 during the cutting is wedge-shaped from the nozzle outlet 44 to the space between the rake face of the blade 40 and the chips. The chips are broken by applying a break force to the chips by using the wedge force of the high-pressure injection force to curl the chips.

[0033]

In the conventional cutting jig shown in FIG. 30, the outer diameter of the chuck body 3 is set to the two center holes 3.
By precisely finishing on the basis of a and 3b, the axis of the chuck body 3 and the rotation center of the cylindrical work 1 can be made to match with high accuracy. Due to the dimensional error described above, a gap is generated in these fitting portions, and the axis of the tapered cone 4 is shifted from the axis of the chuck body 3 by the amount of the gap. This taper cone 4
As a result, the axis of the collet 2 is inclined with respect to the axis of the chuck body 3. As a result, the axis of the inner diameter reference hole 1a of the cylindrical work 1 is shifted with respect to the rotation center of the cylindrical work 1,
There is a problem that the coaxiality of the inner diameter of the cutting portion with respect to the inner diameter reference hole 1a cannot be guaranteed with high accuracy.

On the other hand, in the conventional cutting jig shown in FIG. 31, there is no fitting and sliding member like the tapered cone 4 shown in FIG. 30, and the metal cylinder 12 is enlarged and the center holes 9a, 9b are formed.
By precisely finishing the cylindrical workpiece 1
Metal cylinder 1 in a state enlarged to the same diameter as the diameter of reference hole 1a
Since the coaxiality of the outer diameter of the cylindrical work 1 with respect to the center of rotation of the cylindrical work 1 can be set with high accuracy, the axis of the inner diameter reference hole 1a of the cylindrical work 1 and the center of rotation of the cylindrical work 1 are matched with high accuracy. Can be. However, the thin metal cylinder 1
2 can be expanded against the contraction force, and the amount of expansion that can obtain a sufficient chucking force of the cylindrical work 1 is at most about 50 μm. The clearance between the inner diameter reference hole 1a of the workpiece 1 and the outer diameter of the metal cylinder 12 is very small.
That is, there is a problem that it becomes very difficult to insert the cylindrical work 1 into the chuck body 3, which hinders automation of the chucking operation.

The present invention has been made in order to solve the above-mentioned problems. A cylindrical work is chucked with a sufficient chucking force in its inner diameter reference hole, and the axis of the inner diameter reference hole and the rotation of the work are rotated. It is an object of the present invention to provide a cutting tool for a cylindrical work in which the centers can be matched with high accuracy and the chuck work can be easily automated.

In the conventional cutting jig shown in FIG.
Since both ends of the rotation center 14 and the stop center 16 support both ends of the chuck main body 3, the rotation center of the cylindrical work 1 and the axis of the chuck main body 3 are highly accurate as shown in FIG. But the lathe spindle 15, the turning center 14, the chuck body 3,
Since the dynamic bending rigidity of the work support system including the stop center 16 and the like is small, cutting chatter due to bending vibration of the work support system is likely to occur when the cutting resistance is increased. For this reason, it is necessary to lower the cutting speed and reduce the cutting amount and the feed amount of the blade, and there has been a problem that machining efficiency is deteriorated.

In the conventional cutting jig shown in FIG. 33,
Attach one end of the chuck body 3 to the pawl 22 of the power chuck 22.
a, the other end of the chuck body 3 stops and the center 16
In this case, the dynamic bending rigidity of the work supporting system is relatively large, which is effective as a measure against cutting chatter due to bending vibration of the work supporting system. However, in a method in which one end of the chuck body 3 is supported by a rotation center coaxially mounted on the power chuck 22 and is gripped by the stepped portion side surface of the claw 22a, a plurality of claws 22a are simultaneously attached to the chuck body 3 Cannot be pressed against the outer diameter of the one end, and the rotation center receives a force in the pressing direction by the claw 22a first pressed against the chuck body 3. Therefore, the gripping force of the power chuck 22 is restricted by the static rigidity and strength of the rotation center and cannot be set large. That is, it is necessary to reduce the cutting resistance, and there is a problem that the machining time is increased by lowering the cutting speed or reducing the depth of cut. In addition, a stepped portion is provided on the claw 22a so that one end of the chuck body 3 is attached. In the gripping method, since the three surfaces of the side surface and the end surface of 22a and the side surface of the stop center 16 determine the position and posture of the chuck body 3, it is necessary to strictly manage the relative accuracy of the three surfaces. In practice it is very difficult. Further, since it is also difficult to always maintain a constant relationship between the forces acting on the three surfaces, it is difficult to match the rotational center of the cylindrical work 1 with the axis of the chuck body 3 with high accuracy. was there.

Further, in the conventional cutting jig shown in FIG. 34, one end of the cylindrical member 23 constituting the chuck body 26 is fixed to the lathe spindle 15, so that
The dynamic bending stiffness of the work support system is further larger than that of the configuration shown in FIG. 33, and the effect of suppressing cutting chatter due to bending vibration of the work support system is extremely large. However, in order to insert the cylindrical work 1 into the chuck main body 26, it is necessary to increase the moving distance of the stop center 16, so that the lathe main body becomes large and a large space is required for installing the processing equipment. Also, the work is chucked on the lathe, and this time leads to an increase in machine tact time,
There was a problem that the operating efficiency of the lathe was reduced.

The present invention has been made in order to solve the above-mentioned problems. In a lathe configuration in which both ends of a chuck body are supported at both a turning center and a stop center, insufficient bending rigidity of a work supporting system is provided. An object of the present invention is to provide a cutting tool for a cylindrical work capable of suppressing cutting chatter caused by the rotation of the cylindrical work and aligning the rotation center of the cylindrical work with the axis of the chuck body with high accuracy and improving the machining efficiency. Is what you do.

The natural frequency is reduced and the self-excited vibration is suppressed by applying a chain mat to the outer diameter of the thin portion of the cylindrical work to temporarily increase the thickness of the thin portion to increase its rigidity and weight. In conventional cutting jigs, it is necessary to provide a mechanism in the lathe for applying a chain mat to the outer diameter of the cylindrical work, and to suppress heat generation due to friction between the outer diameter of the cylindrical work and the chain mat. Therefore, it is necessary to supply the lubricating oil during that time, so that the configuration becomes complicated, which leads to an increase in the cost of the lathe, and there is a problem that it cannot be used for processing a semi-finished product that cannot be cleaned in a later step.

Further, in a conventional cutting jig in which a rubber band is wound around an outer diameter of a thin portion of a cylindrical work so as to suppress self-excited vibration by a damper function of the rubber band, a manual operation for attaching and detaching the rubber band is required. Has been added to increase the processing cycle time, and there has been a problem in that an automatic line requires an attaching / detaching device to increase the processing cost.

The present invention has been made to solve the above-described problems. Conventionally, a chip cover having only a function of preventing chips from entering the inside of a work is provided with a damper function, thereby reducing cutting chatter. An object of the present invention is to provide a cutting tool for a cylindrical work capable of reducing the machining cost by reducing or omitting work or devices for preventing chatter by suppressing the chatter.

In the conventional positioning jig shown in FIG. 37, when the cylindrical work 1 is inserted into the chuck body 3 and placed on a plurality of claws 36 of a vice or scroll chuck, the inner diameter of the cylindrical work 1 is reduced. Perpendicularity between the reference hole 1a and the end face,
In addition, the axis of the inner diameter reference hole 1a of the cylindrical work 1 is inclined with respect to the axis of the chuck body 3 by the integration error of the perpendicularity between the axis of the chuck body 3 and the upper surface 36a of the claw 36. When the collet 2 is expanded in this state, the collet 2 first comes into contact with two points of the inner diameter reference hole 1a of the cylindrical work 1 and then the axis of the inner diameter reference hole 1a of the cylindrical work 1 Although a couple acts to match the core, the reaction force generated on the end surface of the cylindrical work prevents the cylindrical work 1 from being chucked by the chucking force opposing the cutting force.
When the collet 2 is further expanded, the inner diameter reference hole 1a and the end face of the cylindrical work, the end face, the collet 2, and the taper cone 4 are distorted or plastically deformed. There was a problem that the accuracy could not be guaranteed with high accuracy.

Further, in the conventional positioning jig shown in FIG. 38, a couple acts to match the axis of the inner diameter reference hole 1a of the cylindrical work 1 with the chuck body 3, but the coupling work of the cylindrical work 1 is performed. It is hindered by the reaction force generated on the inner end surface 1b. In this case, the action / reaction force acting on each part in the closed system of the chuck body 3 and the cylindrical work 1 is balanced, so that even if a cutting force is applied, the chuck body 3
Although the fixed state of the cylindrical work 1 is maintained, the coaxiality of the cutting portion with respect to the reference hole 1a cannot be guaranteed with high precision because the inner diameter reference hole 1a is machined while being inclined with respect to the chuck body 3. Cylindrical member 37 as positioning jig
Even if the end face of the cylindrical workpiece 1 is precisely finished with reference to the two center holes 3a and 3b so that the error of the perpendicularity of the end face of the cylindrical member 37 with respect to the axis of the chuck body 3 can be ignored, Pre-processing is required to precisely finish the attached end face 1b with reference to the inner diameter reference hole 1a, and there is a problem that the processing cost increases.

Further, in the conventional positioning jig shown in FIG. 39, both end surfaces of the cylindrical member 38 as the positioning jig are referenced to the center holes 3a and 3b of the chuck body 3 as in the case shown in FIG. However, there is a problem in that the end face of the cylindrical work 1 needs to be pre-processed to be precisely finished with reference to the inner diameter reference hole 1a, thereby increasing the processing cost.

The present invention has been made in order to solve the above-mentioned problems, and has a high accuracy in aligning the axis of the reference hole of the cylindrical work with the axis of the chuck body and opposing the cutting force. It is an object of the present invention to provide a positioning jig for performing relative positioning between a cylindrical work and a chuck body capable of obtaining a sufficient chucking force.

Further, in the conventional chip processing method, a method of providing a barrier called a chip breaker near the cutting edge of the blade to mechanically curve and deform the chips flowing out and cutting them is as follows.
In the case of small cutting and feeding of the blade, that is, in the case of finish cutting, the breaker does not work well, and helical chips that are long-lasting are generated. Further, in the method of forming a groove or a projection near the corner of the cutting edge by working the cutting edge finely, in the case of finish cutting, the chip is formed into a cylindrical coil shape, but the function of finely dividing the chip cannot be expected. Further, the method of dividing the chips by applying vibration to the cutting tool or changing the cutting edge angle deteriorates the surface roughness of the finished surface. In addition, the method of periodically hitting chips with a rotating body or burning out a pair of electrodes against the chips by Joule heat has a complicated structure, which leads to an increase in the cost of a processing apparatus and a problem in the reliability of cutting. There has been a problem that the extended chips are entangled with the rotating mechanism and the electrodes.

Further, in the conventional cutting tool shown in FIGS. 40 and 41, a considerably high jetting force is required to curl the chips by the jetting force of the fluid. Since it is impossible to inject accurately into
Irregular chip generation and outflow induces cutting chatter.
Also, grooves and projections are provided near the corners of the cutting edge to generate cylindrical coil-shaped chips, and by injecting fluid at a low pressure, the chips can be cut into a certain length and the chips can be scattered from the cutting edge. However, since the tip of the fan-shaped nozzle 42 is close to the tip of the blade 40, chips may enter the nozzle outlet 44,
Chips may be caught in the V-groove formed by the chamfered portion at the tip of the fan-shaped nozzle 42 and the upper surface of the blade 40, and the chips may be entangled with the cutting edge. Also, the inner surface of the work or the tool shank 3
9, there is a problem that chips are entangled in the cutting edge due to bouncing back on the chuck body, or riding on the inner surface of the rotating work and returning to the original position after making a round.

The present invention has been made in order to solve the above-mentioned problems, and is intended to process chips generated within a limited space in the internal diameter cutting of a cylindrical work having an internal diameter reference hole. It is an object of the present invention to provide a swarf processing method and a cutting tool for discharging chips to the outside of a work without entanglement with a cutting tool, a tool shank, a chuck body or the like.

[0050]

According to a first aspect of the present invention, there is provided a cylindrical workpiece cutting jig which is fitted into an inner diameter reference hole of a cylindrical work having an inner diameter reference hole, and has a tapered portion on both inner peripheral surfaces. first extending from both ends in the axial direction while being formed
A cylindrical collet having a plurality of slits formed in the circumferential direction, and a first tapered outer periphery in which tapered center holes are formed at both end faces and partially fitted into a first tapered portion on one end side of the collet. Rod-shaped chuck body having a threaded portion formed on an outer peripheral surface of an end portion located on a small diameter side of the first tapered outer peripheral portion, and a collet slidably fitted to the chuck main body and having one end side. Fits into the second tapered portion on the other end
A plurality of second slits having a second tapered outer peripheral portion and extending in the axial direction from one end side are formed in the circumferential direction.
And a Te Pakon was, first tapered portion of the collet
Slide into the first tapered outer periphery of the chuck body
The collet is expanded radially by the first slit of
And the second tapered outer periphery of the tapered cone
The second taper of the taper cone
The inner diameter of the taper cone is reduced by the slit
Ri, a plate-shaped elastic member on an inner peripheral surface formed in contact with a ring-shaped outer peripheral surface the cylindrical workpiece thinner than the outer circumferential thickness of the fitting and the plate-shaped elastic member on the inner periphery of the plate-like elastic member thickness A first plate-like member having an outer diameter slightly smaller than the inner diameter of the cylindrical work, sandwiching the plate-like elastic member and the first plate-like member from both sides, and at the position of the first plate-like member. A chip cover comprising fixed second and third plate-like members is provided on the chuck body near the inner peripheral cutting end of the cylindrical work.

The cylindrical work according to claim 2 of the present invention.
The cutting tool according to claim 1, wherein the cutting jig is integrated with a turning center engaged with the tapered center hole on one end side of the chuck body and fixed coaxially to the main shaft of the lathe.
And a mass that is at least three times the total mass of the
It has a disk-shaped vibration suppression member having an inertia of 15 times or more of the moment of inertia .

The cylindrical work according to claim 3 of the present invention.
The cutting jig according to claim 1, wherein the circular center is formed around the tapered center hole on one end side of the chuck body.
3 times or more the total weight of the cylindrical workpiece and chuck body
And an inertia of 15 times or more of the total moment of inertia .

Further, the positioning jig for positioning the cylindrical work and the cutting jig according to claim 4 of the present invention is as described in claim 1.
A positioning jig between a cylindrical workpiece and a cutting jig
Te, on the chuck body one end to support the fitting hole to be fitted from above, the end surface of the cylindrical workpiece while being arranged at substantially equal intervals on a circumference around the axial center of the fitting hole A plurality of support pins having the same end face and slidable downward ;
The lower part of each support pin is held and the elastic member of the chip cover acts on the cylindrical work and the frictional force generated when the inner periphery of the cylindrical work is rubbed so that the support pins descend with the axes aligned. An urging means for applying an urging force slightly larger than the resultant force with gravity.

A positioning jig for positioning a cylindrical work and a cutting jig according to a fifth aspect of the present invention has an inner diameter reference hole.
Into the inner diameter reference hole of the cylindrical workpiece to be
The tapered part is formed and extends in the axial direction from both ends.
Cylindrical slit in which a plurality of first slits are formed in the circumferential direction.
The collet has tapered center holes at both end faces.
The first part which fits into the first tapered part on one end side of the collet
It has a tapered outer peripheral portion and is provided outside the first tapered shape.
A thread is formed on the outer peripheral surface of the end located on the small diameter side of the peripheral part.
Rod-shaped chuck body and slidable on this chuck body
And the other end of the collet.
It has a second tapered outer peripheral portion that fits and
2nd slits extending in the axial direction
And a first tapered collet.
The sliding part slides over the first tapered outer peripheral part of the chuck body.
The first slit of the collet expands the collet in the radial direction.
Tensioned and a second tapered outer periphery of the tapered cone
Part slides into the second tapered part of the collet to form a tapered cone
The second slit reduces the inner diameter of the taper cone.
Positioning jig between cylindrical work and cutting jig
A central hole into which one end of the chuck body is fitted from above, and an upper end surface which is disposed at substantially equal intervals on a circumference around the axis of the central hole and supports the end surface of the cylindrical work. A plurality of support pins which are slidable downward on the same surface, and a shaft center of an inner diameter reference hole of the cylindrical workpiece and the chuck.
Make sure that the support pins descend when the axes of the
And urging means for holding a lower portion of each of the support pins and applying an urging force slightly larger than the gravity acting on the cylindrical work.

According to a sixth aspect of the present invention, there is provided a cutting method comprising the steps of cutting a cylindrical workpiece and a cutting jig according to the first aspect.
In the chip disposal method, during cutting of the inner periphery of the cylindrical work, a fluid is ejected from a fluid ejection port that moves while maintaining a relative position with the blade to the inner peripheral surface of the chip cover and the cylindrical work, By reflecting this fluid on the chip cover and the inner peripheral surface of the cylindrical work, a fluid flow is generated in a direction opposite to the rotation of the cylindrical work and from the inside to the outside of the cylindrical work, and the fluid flows. The chips are discharged to the outside of the cylindrical work.

A cutting tool for a cylindrical work according to claim 7 of the present invention is a cutting tool for a cylindrical work according to claim 1.
A fluid ejection port for ejecting a fluid in front of the blade and in parallel with the feeding direction , wherein the fluid ejection port is disposed above the mounting surface side of the blade held by the bite shank of the tool holder and behind the blade. A nozzle, and a second nozzle in which a fluid ejection port is disposed below and opposite to the blade mounting surface and behind the blade to inject fluid between the inner surface of the cylindrical workpiece and the bite shank. is there.

According to the eighth aspect of the present invention, there is provided a cylindrical workpiece cutting tool according to the first aspect.
Wherein each of the fluid ejection ports is disposed above the mounting surface side of the blade held by the bite shank of the bite holder and behind the blade, and injects fluid in front of the blade and parallel to the feed direction. A second nozzle for injecting fluid in a direction opposite to the cutting edge of the first nozzle and the blade and in a direction away from the mounting surface of the blade in the feed direction; A chip control member having a slope formed at a predetermined elevation angle with respect to the chip control member.

The cylindrical work according to claim 9 of the present invention.
The cutting tool according to claim 7 or 8, wherein the fluid is a battery.
The first and the second through a fluid flow passage formed in the light fixture.
This is supplied to the second nozzle.

According to a tenth aspect of the present invention, there is provided a cutting tool for cutting a cylindrical workpiece according to the first aspect.
A first fluid ejection port which is a tool, and which is opened at a position on the attachment surface side of the cutting tool of the cutting tool of the cutting tool holder and at a position behind the cutting tool, and injects fluid in front of the cutting tool and parallel to the feed direction ; And a second fluid ejection port for ejecting fluid in the direction of the cutting edge of the blade and away from the mounting surface of the blade.

According to the eleventh aspect of the present invention, there is provided a cutting tool for a cylindrical work.
A first fluid ejection port which is a tool, and which is opened at a position on the tool mounting surface side of the bite shank of the bite holder and at a position behind the blade, and injects fluid in front of the tool and parallel to the feed direction; A second fluid ejection port for ejecting fluid in the direction of the cutting edge of the blade and away from the attachment surface of the blade, and a third fluid ejection port for ejecting fluid in the direction of feed of the knife and away from the attachment surface. It has a fluid ejection port and a fourth fluid ejection port for ejecting a fluid in a direction opposite to the cutting edge of the blade and above the tip of the cutting tool shank.

[0061]

According to the first aspect of the present invention, the tapered cone of the cutting jig has a tapered outer peripheral portion which can be expanded and contracted by a slit, and is pressed by a pressing nut and slid toward the collet, thereby forming a tapered portion on the other end side of the collet. The shaft is aligned with the chuck body , and the chip cover is fitted with a plate-like elastic part.
Elastic holding of the inner diameter of the cylindrical work with sufficient force around the material,
Self-excited vibration of the cylindrical work is suppressed by the damper action.

The cutting jig according to claim 2 of the present invention
The tool support system including the chuck body
To attenuate bending vibration.

The cutting jig according to claim 3 of the present invention.
The center of the tool is located at the center including the chuck body due to inertia.
To attenuate the bending vibration of the support system.

Further , the cylindrical wire according to claim 4 of the present invention.
Multiple support pins of positioning jig between workpiece and cutting jig
Supports the end faces of the cylindrical workpiece, respectively.
When fixing the workpiece to the chuck body,
Up due to couple generated at the chuck part of the reference hole
Following the end face of the cylindrical workpiece that moves downward,
Move.

Further , according to claim 5 of the present invention, the cylindrical
Multiple support pins of positioning jig between workpiece and cutting jig
Supports the end faces of the cylindrical workpiece, respectively.
When fixing the workpiece to the chuck body,
Up due to couple generated at the chuck part of the reference hole
Moves to follow each end face of the cylindrical workpiece to be moved downward
Move.

The cutting process according to claim 6 of the present invention.
The method is opposite to the rotation of the cylindrical workpiece and cylindrical
Generates a fluid flow from the inside of the work to the outside,
Discharge chips to outside of cylindrical workpiece by fluid flow
You.

Further , according to claim 7 of the present invention,
The first nozzle of the cutting tool is in front of the cutting tool and feeds
Parallel to the direction, and the second nozzle is the inner surface of the cylindrical workpiece
Inject fluid between the tool and the tool shank
The direction of rotation of the cylindrical work is opposite to that of the cylindrical work
Generates a fluid flow from the inside of the work to the outside,
Discharge chips to outside of cylindrical workpiece by fluid flow
You.

Further , according to claim 8 of the present invention,
The first nozzle of the cutting tool is in front of the cutting tool and feeds
Parallel to the direction, and the second nozzle is the inner surface of the cylindrical workpiece
Inject fluid between the tool and the tool shank
The direction of rotation of the cylindrical work is opposite to that of the cylindrical work
Generates a fluid flow from the inside of the work to the outside,
The flow direction is controlled by the chip control member due to the fluid flow.
The controlled chips are discharged to the outside of the cylindrical work.

Further , according to claim 9 of the present invention, the cylindrical
The fluid flow path of the cutting tool of the workpiece has first and second nozzles.
To supply fluid.

Further , according to claim 10 of the present invention,
The first fluid ejection port of the work cutting tool is in front of the blade and
Parallel to the feed direction, and the second fluid ejection port is a blade
In the forward direction and away from the blade mounting surface.
By injecting each fluid, the rotation of the cylindrical work
Is the fluid flowing from the inside to the outside of the cylindrical workpiece in the opposite direction
Generates a flow of fluid, and the flow of fluid
Discharge outside the workpiece.

Further , according to claim 11 of the present invention,
The first fluid ejection port of the work cutting tool is in front of the blade and
Parallel to the feed direction, and the second fluid ejection port is a blade
In the forward direction and away from the blade mounting surface,
The third fluid ejection port is in the feed direction of the blade and at the mounting surface.
And the fourth fluid ejection port is a blade
In the opposite direction and above the tip of the tool shank
By injecting each fluid, the rotation of the cylindrical work
Is the fluid flowing from the inside to the outside of the cylindrical workpiece in the opposite direction
Generates a flow of fluid, and the flow of fluid
Discharge outside the workpiece.

[0072]

[Embodiment 1] Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG.
1 is a cross-sectional view showing the configuration of a cutting tool according to Embodiment 1 of the present invention, FIG. 2 is a front view and a side view showing the configuration of a tapered cone in FIG. 1, and FIG. 3 shows the configuration of a first chip cover in FIG. FIG. 4 is a sectional view showing the configuration of the second chip cover in FIG.

In the figure, the same parts as those of the prior art shown in FIG. As shown in FIG. 2, reference numeral 39 denotes a cobb-shaped hole 39 a at four locations on the circumference, a tapered outer peripheral portion 39 b fitted to the tapered portion 2 b of the collet 2 at one end, and a hole 39 a from one end. The setscrew 8 is a tapered cone having slits 39c formed therein, and the set screw 8 fitted to the chuck main body 3 and fixed to the chuck main body 3 is disposed in the hole 39a. The coaxiality and taper angle of the outer diameter of the tapered outer peripheral portion 39b with respect to the axis of the inner diameter of the tapered cone 39 are guaranteed with high accuracy.

Numeral 40 denotes a first chip cover disposed between the tapered cone 39 and the nut 6, and as shown in FIG.
A cylindrical member 41 fitted to the chuck body 3 and having a flange portion 41a formed at one end side; a neoprene rubber plate 42 having an outer diameter of 1 mm larger than the inner diameter of the cut portion of the cylindrical work 1 and a thickness of 2 mm; A first plate member 43 fitted between the cylindrical member 41 and the neoprene rubber plate 42, which is 1.5 mm slightly thinner than the neoprene rubber plate 42, and an outer diameter of about 8 mm from the outer diameter of the neoprene rubber plate 42 The neoprene rubber plate 4 is formed to be small and fitted to the cylindrical member 41.
The second and third plate-like members 43 sandwich the second and first plate-like members 43 from both sides, and are fixed to the flange portion 41a of the cylindrical member 41 at the position of the first plate-like member 43 by flat screws 44. 45 and 46,
The coaxiality of the outer diameter of the neoprene rubber plate 42 with respect to the axis of the chuck body 3 is managed by fitting the inner and outer diameters of the neoprene rubber plate 42, the first plate member 43, and the cylindrical member 41.

Reference numeral 47 denotes a second chip cover, one end of which is disposed in contact with the stepped end face 3f of the chuck body 3, and as shown in FIG.
f, the outer diameter of the cylindrical member 48 is larger than the inner diameter of the cut portion of the cylindrical work 1 by 1 mm, and the thickness is 2 m.
m neoprene rubber plate 49 and a first 1.5 mm thick neoprene rubber plate 49 fitted to chuck body 3
And the outer diameter of the neoprene rubber plate 49 is formed to be smaller than the outer diameter of the neoprene rubber plate 49 by about 8 mm. A second and third plate-like member 52 fixed to the cylindrical member 48 by a flat screw 51,
The neoprene rubber plate 49 and the first plate-shaped member 50 are fitted with the inner and outer diameters so that the neoprene rubber plate 4 with respect to the axis of the chuck body 3 is formed.
The concentricity of the outer diameter of 9 is controlled.

Next, the operation of the cutting jig in the first embodiment configured as described above will be described. First, the cylindrical work 1 is inserted into the chuck body 3 with the first chip cover 40 and the nut 6 removed, and the cylindrical work 1 and the chuck body 3 are positioned at a position where the inner diameter reference hole 1a and the collet 2 match. Relative positioning is performed. Next, the first chip cover 40 is inserted into the chuck body 3 and the nut 6
Is screwed into the screw portion 3d. Then, when the nut 6 is further tightened, the tightening thrust is transmitted to the tapered cone 39 via the cylindrical member 41 of the first chip cover 40, and the tapered outer peripheral portion 39 b of the tapered cone 39 is transferred to the tapered portion 2 b of the collet 2. As it is slipped and inserted,
The diameter is reduced and the inner diameter of the taper cone 39 and the chuck body 3
Is in close contact with the outer diameter of no gap.

At the same time, the tapered portion 2a of the collet 2 is slidably fitted to the tapered outer peripheral portion 3c of the chuck body 3, and the tapered outer peripheral portion 3c of the chuck body 3 is relatively inserted into the tapered portion 2a of the collet 2. Becomes Thereby, the collet 2 is expanded in the radial direction without tilting with respect to the axis of the chuck body 3, the outer diameter of the collet 2 is pressed against the inner diameter reference hole 1 a of the cylindrical work 1, and the cylindrical work 1 is To a fixed state. Then, both center holes 3a and 3b of the chuck body 3 are supported by a center and a stop center of the lathe and driven to rotate to perform cutting.

On the other hand, the first and second chip covers 40,
The cylindrical workpiece 1 is formed by fitting the chuck body 3, the first plate member 43, and the neoprene rubber plate 49, or the chuck body 3, the first plate member 50, and the neoprene rubber plate 49, respectively. Each neoprene rubber plate 4
The outer diameters of 2, 49 are evenly contacted without any gap. Further, each neoprene rubber plate 42, 49 is sandwiched in the vicinity of its outer diameter by the second and third plate members 45, 46 and 52, 53, and the clamping force is applied to each of the first plate members 43, 49. By being controlled to have a thickness of 50, the cylindrical work 1 is pressed against the inner diameter of the cylindrical work 1 with a sufficient pressing force without impairing elasticity.

As described above, according to the first embodiment, the tapered outer peripheral portion 39b of the tapered cone 39 is fitted to the tapered portion 2b of the collet 2 and reduced, so that the tapered cone 39 and the chuck body 3 have no gap. Since the center of rotation of the cylindrical workpiece 1 and the axis of the inner diameter reference hole 1a coincide with high accuracy and chucking is facilitated, the chucking operation can be automated.

Further, the respective outer diameters of the neoprene rubber plates 42, 49 of both the chip covers 40, 47 are evenly brought into contact with the inner diameter of the cylindrical work 1 without any gap, and are pressed with a sufficient pressing force. Each neoprene rubber plate 42, 49
Functions as a damper, and can suppress self-excited vibration of the cutting portion of the cylindrical workpiece 1 to prevent cutting chatter, so that there is no need to reduce the cutting speed or the like, thereby improving machining efficiency. Can be.

Embodiment 2 FIG. FIG. 5 is a sectional view showing the configuration of the cutting jig according to the second embodiment of the present invention. In the figure, the same parts as those in the first embodiment shown in FIG. 1 and the conventional example shown in FIG. Reference numeral 54 denotes a disk-shaped vibration suppressing member having a predetermined mass and a moment of inertia. A tapered hole 54a formed at one end side is fitted into the tapered end portion 15a of the lathe spindle 15, and the lathe spindle 5 15 and the other end side fixedly supports the turning center 14.

Next, the operation of the cutting jig in the second embodiment configured as described above will be described. In the second embodiment as well, both ends of the chuck body 3 are supported by the turning center 14 and the stop center 16 and driven to rotate in the same manner as in the first embodiment, but the lathe spindle 15 and the vibration suppressing member 5 are driven.
4, rotation center 14, chuck body 3, stop center 1
6 is attenuated by the large inertia of the vibration suppressing member 54, and the center of rotation of the cylindrical work 1 and the axis of the inner diameter reference hole 1a coincide with high accuracy.

An experiment performed to prove the vibration damping effect of the vibration suppressing member 54 will be described below. First, the lathes are PNC-L551 type NC lathe manufactured by Daihatsu Kogyo Co., Ltd. and NK20 type NC lathe manufactured by Hitachi Seiki Co., Ltd.
And The main specifications of the cylindrical work 1, the chuck body 3, the rotation center 14, and the vibration suppressing member 54 are shown in Tables 1 to 4.
4 as shown in FIG.

[0084]

[Table 1]

[0085]

[Table 2]

[0086]

[Table 3]

[0087]

[Table 4]

As a result of the experiment, when the cylindrical work 1 was cut by directly attaching the center 14 around the main shaft 15 of each lathe, cutting chatter occurred.
No. shown in Table 4 for NC-L551 NC lathe. 541
The cutting chatter can be suppressed by attaching the vibration suppressing member 54 of the specification of No. No. NK20 type NC lathe manufactured by Hitachi Seiki Co., Ltd. By attaching the vibration suppression member 54 having the specification of 542, cutting chatter could be suppressed. From the above, it is considered that the vibration suppressing member 54 only needs to have a mass of three times or more of the total mass of the cylindrical work 1 and the chuck body 3 and an inertia of 15 times or more of the total moment of inertia. The upper limits of the mass and the moment of inertia are limited by the rigidity of the main shaft of the lathe to be used, the load resistance to the cutting conditions, and the like.

As described above, according to the second embodiment, the vibration suppressing member 54 is arranged coaxially with the lathe main shaft 15, and the bending vibration of the work supporting system including the chuck body 3 is attenuated by its inertia. Therefore, cutting chatter caused by insufficient bending stiffness of the work supporting system can be suppressed, and the center of rotation of the cylindrical work 1 and the axis of the inner diameter reference hole 1a can be matched with high accuracy to improve machining efficiency. it can.

Embodiment 3 FIG. In the second embodiment, the rotation center 14 is the rotation transmitting rod 1.
8 is integrated with the disk-shaped member 17 to which the rotation transmission rod 18 is attached.
Can be directly attached to the other end surface of the vibration suppressing member 54, the same effect as that of the second embodiment can be exerted.

Embodiment 4 FIG. In the second embodiment, the bending vibration of the work supporting system is suppressed by the inertia of the vibration suppressing member 54. However, the turning center 14 is enlarged, and the bending of the work supporting system is Even when the vibration is suppressed, not only the same effects as in the case of the second embodiment but also the effect of simplifying the structure can be obtained.

Embodiment 5 FIG. FIG. 6 is a partial cross-sectional front view showing a configuration of a positioning jig for a cylindrical workpiece and a cutting jig in Embodiment 5 of the present invention, and FIG. 7 is a plan view of the positioning jig in FIG. In the figure, the same parts as those in the first embodiment shown in FIG. Reference numeral 55 denotes a jig main body, a receiving surface 55a for receiving the stepped end surface 3e of the chuck main body 3 on the upper surface, and a fitting hole 55b into which one end side of the chuck main body 3 is fitted in a central portion. A sliding hole 55c and a hole 55d having a slightly larger diameter than the sliding hole 55c are formed at three equally spaced positions on a predetermined circumference centered on the fitting hole 55b. Gobo 55b
Are formed at the side portions of the through holes 55e.

Reference numeral 56 denotes a support pin which is slidably fitted in each of the sliding holes 55c and has a protruding portion 56a formed below. The support pins 56 support the one end face of the cylindrical work 1 at the upper end faces. 5
7 is a compression coil spring mounted in each hole 55d.
The support pin 56 is urged upward by a force slightly greater than the frictional force generated when the chip cover 40 of the above-mentioned chip rubs the inner diameter of the cylindrical work 1 and the gravity acting on the cylindrical work 1. The upper surface of the projecting portion 56a of the support pin 56 is inserted into the sliding hole 55c.
And the step portion of the hole 55d. 58 is through hole 5
A pressing member that slides inside 5e by driving of a pressing mechanism 59 such as an air cylinder, and presses one end side of the chuck body 3 in the fitting hole 55b from the side. And these 5
The positioning jig 60 is constituted by 5-59.

Next, the operation of the positioning jig in the fifth embodiment configured as described above will be described. First, one end of the chuck body 3 is inserted into the fitting hole 55b of the jig body 55, and the stepped end face 3e of the chuck body 3 is
5 is placed on the receiving surface 55a. At this time, the chip cover 40
And the nut 6 is removed from the chuck body 3. Next, the driving of the pressing mechanism 59 causes the pressing member 58 to slide in the through hole 55 e and press the one end side surface of the chuck main body 3, so that the chuck main body 3 is fixed to the jig main body 55.

Thereafter, the cylindrical work 1 is inserted into the chuck body 3 from above, and one end side end surface of the cylindrical work 1 is supported by the upper end surface of each support pin 56. At this time, a force is applied to each support pin 56 by subtracting the frictional force generated between the neoprene rubber plate 42 of the first chip cover 40 and the inner diameter of the cylindrical work 1 from the gravity acting on the cylindrical work 1. However, the support pin 56 maintains its position by the urging force of the compression coil spring 57. Then, the first chip cover 40 is inserted into the chuck body 3 and the nut 6 is screwed. In this state, the nut 6 is tightened, the collet 2 is expanded, and the cylindrical work 1 is chucked in the inner diameter reference hole 1a.

At this time, the outer diameter of the neoprene rubber plate 42 of the first chip cover 40 rubs the inner diameter of the cylindrical workpiece 1, and
The frictional force generated by this acts on the support pin 56, but the support pin 56 maintains its position by the urging force of the compression coil spring 57. Also, when expanding collet 2,
First, the collet 2 is the inner diameter reference hole 1a of the cylindrical workpiece 1.
At two points where the end face of the work 1 is inclined, the couple acting to make the axis of the inner diameter reference hole 1a of the cylindrical work 1 conform to the axis of the chuck body 3 is tilted. Since the support pin 56 is lowered, the operation of aligning the axis of the inner diameter reference hole 1a of the cylindrical workpiece 1 with the axis of the chuck body 3 is not hindered. The couple is a compression coil spring 5
7, the reaction force of the compression coil spring 57 can be ignored as a force opposing the chuck force.

As described above, according to the fifth embodiment, the first
The support pin 56 urged by a force slightly smaller than the frictional force generated when the chip cover 40 rubs the inner diameter of the cylindrical work 1 and the gravitational force acting on the cylindrical work 1 causes the cylindrical work Since the positioning is performed in a state where the end face of the first end 1 is supported, the axis of the inner diameter reference hole 1a of the cylindrical work 1 and the axis of the chuck main body 3 match with high precision and oppose the cutting force. The work is chucked with a sufficient chucking force.

Embodiment 6 FIG. In the above-described fifth embodiment, the case where the first chip cover 40 is provided has been described. However, for example, when only the inner diameter of one end side of the cylindrical workpiece 1 is cut, the first chip cover is unnecessary. Needless to say, in this case, the urging force of the compression coil spring 57 may be slightly larger than the gravitational force acting on the cylindrical work 1, and the same effect as in the fifth embodiment is exerted. be able to.

Embodiment 7 FIG. 8 is a perspective view for explaining the concept of a chip processing method in Embodiment 7 of the present invention, FIG. 9 is a top view showing the shape of the blade edge, FIG. 10 is a cross-sectional view along line XX in FIG.
FIG. 11 is a top view showing a cutting edge shape of the blade different from that in FIG. 9, and FIG. 12 is a cross-sectional view along line XII-XII in FIG. In the figure, the arrow A indicates the rotation direction of the work 1. Reference numerals 61 and 62 denote fluid ejection nozzles attached to a tool rest (not shown). The fluid ejection nozzle 61 a of the fluid ejection nozzle 61 is located above the mounting surface side of the cutting tool 64 of the bite shank 63 and outside the cylindrical workpiece 1. The fluid ejection port 62 a of the fluid ejection nozzle 62 is arranged below the cutting surface side of the cutting tool 64 of the bite shank 63 and outside the cylindrical work 1. The fluid ejection port 61a is provided with the blade 6
A fluid is ejected from the inner surface of the cylindrical work 1 to the third plate-shaped member 46 of the first chip cover in a relatively wide area in the directions indicated by arrows C, D, and E around the tip of the fluid discharge port 62a. Ejects a fluid over a relatively wide area in the directions indicated by arrows F, G, and H into the gap between the inner surface of the cylindrical work 1 and the cutting tool shank 63,
The fluid ejected in the directions indicated by the arrows C, D, E, F, G, and H is reflected and merges on the inner surface of the cylindrical work 1 and the third plate-like member 46 of the first chip cover to form a cylindrical shape. Work 1
The diameter and the angle are adjusted so that the fluid flows from the inside to the outside in the anti-rotational direction.

The tool shank 63 is provided with a concave portion on the tip of which the tool 64 is placed, and is attached to the tool post via a tool holder (not shown). Knife 64
Is a triangular shaped throw-away tip as shown in FIGS. 9 and 10, and has a concave groove 64a and a projection 64b at its tip.
These form a chip curl surface 64c, and a groove 64d similar to the groove 64a has a front cutting edge 64e.
And along the horizontal cutting edge 64f. Alternatively, as shown in FIGS. 11 and 12, an arc-shaped concave groove 64g is provided along the front end of the blade 64, the front cutting edge 64e, and the horizontal cutting edge 64f, and the projection 64i forming the chip curl surface 64h is provided with the blade 64. Is provided in the tip concave groove 64g. These blades 64 are positioned with respect to the tool shank 63 by being fitted into the recesses of the tool shank 63, and are fastened with screws 65. Numeral 66 denotes a cylindrical groove provided at the tip of the blade 65, a projection, and a cylindrical coil-shaped chip generated and discharged by the ejection of the fluid.

Next, a chip processing method will be described with reference to FIGS. Groove 64 provided at the tip of blade 64
A, the projection 64b or the concave groove 64g, the projection 64i, and the ejection of the fluid from the fluid ejection ports 61a, 62a generate the chip 66 having a cylindrical coil shape. The chips 66 are divided by the ejection force of the fluid or hit by the chuck body 3, the inner surface of the cylindrical work 1, or the tip of the bite shank 63. The broken chip 66 is indicated by an arrow F,
G and H prevent the fluid from entering between the cylindrical workpiece 1 and the cutting tool shank 63 and are lifted above the blade 64, and the arrows C, D,
E is ejected toward the third plate member 46 of the first chip cover by the ejection of the fluid indicated by E, and is constituted as it is by the inner surface of the cylindrical work 1 and the nut 6 and the cylindrical member 41 of the first chip cover. The fluid flows on the flow B of the fluid and is discharged to the outside of the cylindrical work 1. Fluid flow rate,
The injection pressure and the injection angle are the rotational speed of the cylindrical work 1, the chip 6
6 is set according to the size of the space formed by the inner surface of the work 1, the inner diameter chuck, and the metal plate 49 of the chip cover, and the chips 66 are cut along the inner surface of the cylindrical work 1 by the bite shank 63. Adjusted so that it does not return to the side.

As described above, according to the seventh embodiment, the flow B of fluid from the inside to the outside of the cylindrical work 1 is generated in the direction opposite to the rotation direction A of the cylindrical work 1, Since the chips 66 are discharged to the outside of the cylindrical work 1 by the flow B, the chips 66 are not entangled with the bite shank 63, the blade 64, the nut 6 mounted on the chuck body 3, the cylindrical member 41, and the like. It can be discharged to the outside of the cylindrical work 1.

Embodiment 8 FIG. FIG. 13 is a perspective view for explaining the concept of chip processing by a cutting tool for a cylindrical work in Embodiment 8 of the present invention.
14 is a front view showing the configuration of the cutting tool in FIG. 13 as a partial cross section, and FIGS. 15 and 16 are a left side view and a right side view showing the configuration of the cutting tool in FIG. In the figure, the same parts as those in the seventh embodiment shown in FIG. Numeral 67 denotes a tool holder in which a fluid passage 67a is formed and a connection joint 68 is fixed on the fluid inlet side, and a bite shank 63 is fixed on the side facing the cylindrical work 1.

Reference numerals 69, 70 denote first and second nozzles connected to both ends of the fluid path 67a on the fluid outlet side, respectively. 13 and ejects fluid in front of the blade 64 and in parallel with the feed direction as indicated by an arrow I in FIG.
Is disposed below and opposite to the mounting surface side of the cutting tool 64 and behind the cutting tool 64, as shown by an arrow J in FIG. Inject.

The ejection angles of the fluid ejection ports 69a and 70a of the nozzles 69 and 70 are adjusted so as to generate the same fluid flow B as in the seventh embodiment. Note that the diameters of the first and second nozzles 69 and 70 are practically restricted due to the space issue allowed for the cutting tool, so that the ejection pressure and flow rate of the fluid are restricted. Therefore, the nozzle ports 69a and 70a are arranged near the blade in order to accurately capture the chips and discharge the chips along the flow B of the fluid.

Next, the operation of the cutting tool according to the eighth embodiment configured as described above will be described. In the same manner as in the seventh embodiment, a cylindrical coil-shaped chip 66 is generated and cut by the ejection of the fluid from the concave groove and the projection provided on the cutting edge of the blade 64 and the fluid ejection ports 69a and 70a. Most of the cut chips 66 are prevented from entering between the cylindrical workpiece 1 and the cutting tool 63 by the ejection of the fluid indicated by the arrow J, are lifted above the cutting tool 64, and are indicated by the arrow I. The fluid is ejected toward the third plate-shaped member 46 of the first chip cover, and the space is formed as it is by the inner surface of the cylindrical work 1 or the nut 6 and the cylindrical member 41 of the first chip cover. On the fluid flow B, and is discharged to the outside of the cylindrical work 1.
Partly returns to the bite shank 63 in the above space because the fluid injection I, J is limited to a narrow range,
It is blown off again by the fluid ejected in the directions I and J, and is discharged along the flow B of the fluid, or is dropped below the bite shank 63 on the inner surface of the cylindrical work 1 and each part. The dropped chips 66 flow on the inner surface of the cylindrical workpiece 1 in the direction of A, rotate once, and rotate
3 is stopped by the flow B of the fluid, and is discharged to the outside of the cylindrical work 1 along the flow. The flow rate, ejection pressure, and ejection angle of the fluid are the rotational speed of the cylindrical work 1, the width and thickness of the chip 66, the inner surface of the cylindrical work 1, the chuck body 3, and the third plate-shaped first chip cover. It is set according to the size of the space formed by the member 41 and the like, and is adjusted so that the chips 66 do not return to the cutting tool 63 along the inner surface of the cylindrical work 1.

As described above, according to the eighth embodiment, the fluid ejection ports 69a, 7 of the first and second nozzles 69, 70 are provided.
0a, the fluid is ejected into the gap between the cutting tool 64 and the inner surface of the cylindrical work 1 near the cutting edge of the cutting tool 64 and in parallel with the feeding direction, and the cutting tool 64 to generate a fluid flow B. Since the chips 66 are discharged to the outside of the cylindrical work 1 by the fluid flow B, the chips 6
6 can be discharged to the outside of the cylindrical work 1 without being entangled with the bite shank 63, the blade 64, the nut 6 mounted on the chuck body 3, the cylindrical member 41 and the like.

Embodiment 9 FIG. FIG. 17 is a perspective view for explaining the concept of chip processing by a cutting tool for a cylindrical work in Embodiment 9 of the present invention;
18 is a front view showing the configuration of the cutting tool in FIG. 17 as a partial cross section, FIG. 19 is a left side view showing the configuration of the cutting tool in FIG. 17, and FIG. 20 is a chip generation state at the cutting edge of the cutting tool in FIG. FIG. 21 is a side view as viewed from the outer diameter of the work toward the center of rotation, FIG. 21 is a perspective view of the state of chip generation at the cutting edge of the cutting tool in FIG. 17 viewed from the direction in which the cutting edge is sent, and FIG. FIG. 23 is a top view showing the cutting edge shape of the cutting tool, FIG. 23 is a side view showing the cutting edge shape of the cutting tool in FIG. 22, FIG. 24 is a top view showing the cutting edge shape of the cutting tool different from FIG. 22, and FIG. It is a side view which shows the cutting edge shape of a cutting tool.

In the figure, the same parts as those in the embodiments 7 and 8 are denoted by the same reference numerals, and the description is omitted.
Reference numeral 71 denotes a tool holder having a fluid path 71a formed therein and a connection joint 72 fixed to the fluid inlet side thereof. Reference numeral 73 denotes a recess fixed to the tool holder 71 and having a tip on which a blade 74 is placed. The bite shanks 75, 76 are first and second nozzles connected to the fluid outlet side of the fluid path 71a, and the fluid ejection port 75a of the first nozzle 75
Is disposed above the mounting surface side of the blade 74 and behind the blade, injects fluid in front of the blade 74 and in parallel with the feed direction as indicated by an arrow M in FIG.
The fluid outlet 76a of No. 6 is arranged in the same manner as the fluid outlet 75a of the first nozzle 75, and as shown by an arrow N in FIG. Ejects the fluid in the direction away from it. The fluid ejection angles of the fluid ejection ports 75a and 76a are adjusted so as to generate the same fluid flow B as in the seventh and eighth embodiments.

The cutting tool 74 is a triangular throw-away tip as shown in FIGS. 22 and 24. The tip has a chip curl surface inclined from the front cutting edge 74a to the horizontal cutting edge 74b with respect to the horizontal cutting edge 74b. A groove 77 or 78 having 77a or 78a is provided as shown in FIG. 23 and FIG. 79 is mounted on the upper surface 74 c of the blade 74 in close contact with the upper surface 7 c of the blade 74 near the tip of the blade 74.
4c is a chip control member having an inclined surface 79a forming an elevation angle θ with respect to 4c.
Is positioned with respect to the blade 74 by being fitted into the concave portion. The blade 74 and the chip control member 79 are pressed against the cutting tool shank 73 by the clamper 80 and fixed by screws 81. Reference numeral 82 denotes a spiral chip continuously generated and discharged by the groove 77 or 78 and the chip control member 79.

Next, the operation of the cutting tool according to the ninth embodiment configured as described above will be described. First, the knife 74
Spiral chips 82 are continuously generated by the grooves 77 or 78 provided at the tip of the spiral. The direction in which the chips 82 flow out varies depending on the shapes of the grooves 77 and 78 and the cutting conditions such as feed and cutting speed.
By adjusting the inclination with respect to b, the chips 82 are caused to flow out in front of the horizontal cutting edge 74b and in a direction away from the cutting edge. In addition, the ejection of the fluid indicated by the arrow M prevents the chip 82 from returning to the horizontal cutting edge 74b and the upper surface of the chip regulating member 79. The chips 8 thus drained
2 falls by its own weight, hits the inner surface of the cylindrical work 1, the nut 6, and the cylindrical member 41 of the first chip cover,
The fluid flows in the space formed by these components in the direction of arrow A, and tries to wind around the chuck body 3 and the like. Is discharged. The flow rate of the fluid,
The injection pressure and the injection angle are the rotational speed of the cylindrical workpiece 1, the chip 8
The chip 8 is set according to the width and thickness of the chip 2 and the size of the space formed by the inner surface of the cylindrical work 1, the chuck body 3, the third plate-shaped member 41 of the first chip cover, and the like.
2 is a tool shank 63 along the inner surface of the cylindrical work 1
Adjusted so that it does not return to the side.

As described above, according to the ninth embodiment, each of the fluid ejection ports 75a, 7a of the first and second nozzles 75, 76 is provided.
6a, in front of the blade 74 and parallel to the feed direction, and in the direction opposite to the blade edge of the blade 74 and in the feed direction, the blade 7
In addition to injecting fluid in a direction away from the mounting surface of the cutting tool 4, a chip control member 79 having a slope 79a formed at a predetermined elevation angle θ with respect to the transverse cutting edge is disposed on the upper surface 74c of the cutting tool 74. The chips 82 to be removed are caused to flow in a direction away from the cutting edge and then placed on the flow B of the fluid.
A knife 6 and a nut 6 attached to the chuck body 3;
It can be discharged to the outside of the cylindrical work 1 without being entangled with the cylindrical member 41 or the like.

Embodiment 10 FIG. FIG. 26 is a perspective view for explaining the concept of chip processing by a cutting tool for a cylindrical work in Embodiment 10 of the present invention. FIG. 27 is a front view showing a configuration of the cutting tool in FIG. 28 is a bottom view showing the configuration of the cutting tool in FIG. 26 as a partial cross section, and FIG. 29 is a left side view showing the configuration of the cutting tool in FIG. In the drawings, the same parts as those in the above embodiments are denoted by the same reference numerals, and description thereof will be omitted.

83 has a fluid passage 83a formed therein.
The fluid inlet side is a bite holder to which a connection joint 68 is fixed, and a concave portion 83b to which a bite shank described later is attached is formed at an end. Reference numeral 84 denotes a bite shank fitted into the recess 83b of the bite holder 83 and fastened and fixed by bolts 85, and has a rectangular shape having a cross section longer in the direction of the main component force, and has a bite holding portion therein. Tool 8
A fluid path 84a communicating with the third fluid path 83a is formed, and a blade 64 is fastened and fixed to the distal end portion with a screw 65, and at a position above the mounting surface side of the blade 64 and behind the blade 64. Are formed with first, second, third, and fourth fluid ejection ports 84b, 84c, 84d, and 84e, respectively.

Then, the first fluid jet port 84b is
As shown by an arrow O, the fluid is ejected in front of the blade 64 and in parallel with the feed direction.
26, the fluid is ejected in the direction of the cutting edge of the cutting tool 64 and away from the mounting surface of the cutting tool 64, as indicated by an arrow R in FIG.
In the feed direction of the blade 64 and the blade 6 as shown by the arrow P in FIG.
26, the fourth fluid ejection port 84e is directed in a direction opposite to the cutting edge of the cutting tool 64, and the fourth fluid ejection port 84e is moved in a direction opposite to the cutting edge of the cutting tool 64 as shown by an arrow Q in FIG. Each opening angle is adjusted so that a fluid flow B similar to that in each of the above-described embodiments is generated by ejecting the fluid above the distal end portion.

As described above, according to the tenth embodiment, the cross-sectional shape of the bite shank 84 is a rectangular parallelepiped shape which is long in the main component force direction. Not only can be prevented, but also heavy cutting can be performed, and machining efficiency is also improved. Further, since the diameter, position, and angle of each of the fluid ejection ports 84b to 84e are freely set and adjusted, a fluid flow B similar to that of each embodiment can be generated, and cutting can be performed similarly to each embodiment. The chips 66 generated therein can be discharged to the outside of the cylindrical work 1 without being entangled with the bite shank 84, the blade 64, the nut 6 mounted on the chuck body 3, the cylindrical member 41, and the like.

Since the fluid ejection ports 84b to 84e are formed directly on the cutting tool 84 itself, the nozzles in the above embodiments can be omitted.
The situation that the chips 66 are entangled with the nozzles is also eliminated, and the reliability of the chip processing is further improved, and the present invention can be applied to the case where the space formed between the cylindrical workpiece 1 and the chuck body 3 is narrow. There is.

Further, similarly to the above embodiments, each fluid path 8
3a and 84a are formed inside the cutting tool holder 83 and the cutting tool shank 84, respectively. Therefore, although not described in each of the above embodiments, the fluid piping can be omitted, and there is little factor that chips are entangled. As a result, not only the reliability of the chip processing is improved, but also the tool can be easily set up and the working efficiency is improved.

Embodiment 11 FIG. In the above-described tenth embodiment, the case where the chip control member 79 in the ninth embodiment is not attached is described.
By adjusting the diameter, position, and opening angle of each of the fluid ejection ports 84b to 84e, the same effects as in the ninth embodiment can be exerted.

Embodiment 12 FIG. In each of the above embodiments, the case where the inner diameter of the cylindrical work 1 supported on the stop center 16 is cut is described. However, the present invention is applied to the case where the inner diameter of the cylindrical work 1 supported on the turning center 14 is cut. Needless to say, the same effect can be obtained.

[0121]

As described above, according to the first aspect of the present invention , the first tapered portion of the collet is the first tapered portion of the chuck body.
To the first slit of the collet
Expands the collet in the radial direction.
The collet is not tilted with respect to the axis of the chuck body.
The outer diameter can be pressed against the inner diameter reference hole of the cylindrical work. Also,
The second tapered outer periphery of the tapered cone is the second
To the second slit of the taper cone
By reducing the inner diameter of the taper cone,
The inner diameter of the pakone and the outer diameter of the chuck body are tightly closed
And the center of rotation of the cylindrical workpiece
And the center of the bore hole can be matched with high accuracy.
Since chucking is also easy, chuck work can be automated.
It becomes possible and the processing efficiency can be improved. Furthermore, the outer peripheral surface
Abuts the inner peripheral surface of the cylindrical workpiece and is formed in a ring shape
The plate-like elastic member and the outer periphery are fitted to the inner periphery of this plate-like elastic member.
A first plate-like member having a thickness smaller than the thickness of the elastic member;
The outer diameter is slightly smaller than the inner diameter of the cylindrical workpiece.
Sandwiching the plate-shaped elastic member and the first plate-shaped member from both sides
Together with the second and fixed at the position of the first plate-like member
The chip cover consisting of the third plate-like member is
By mounting on the chuck body near the end of inner circumference cutting
The outer diameter of the plate-like elastic member is
The plate-like elastic member is near its outer diameter.
Is sandwiched between the second and third plate members, and
By controlling the force to the thickness of the first plate-shaped member,
Inner diameter of cylindrical workpiece with sufficient pressure contact without impairing workability
The present invention can provide a cutting tool for a cylindrical work, which can be pressed against the workpiece and can prevent cutting chatter caused by self-excited vibration of a cutting portion of the cylindrical work.

According to a second aspect of the present invention, in the first aspect, the rotation center is integrated with the rotation center engaged with the tapered center hole at one end side of the chuck body and fixed coaxially to the main shaft of the lathe. , Total weight of chuck body and cylindrical workpiece
More than 3 times the mass and more than 15 times the total moment of inertia
The Rukoto comprising a disc-shaped vibration suppressing member having a inertia
Reduces the bending vibration of the workpiece support system including the chuck body
Since so as to Decay, can suppress cutting chatter caused by the lack of bending stiffness of the workpiece support system, improve the machining efficiency by the axis of the rotation center and the inner diameter reference hole of the cylindrical workpiece are matched with high precision It is possible to provide a cutting tool for a cylindrical work that can perform the cutting.

According to a third aspect of the present invention, in the first aspect, the cylindrical work and the chuck main body are provided at the rotation center engaged with the tapered center hole on one end side of the chuck main body.
3 times or more of the total mass of
By Rukoto to have the inertia of more than 15 times, the work support system
Since the bending is to attenuate vibrations of depressive cutting chatter caused by the lack of bending stiffness of the workpiece support system
Control can, cylindrical workpiece rotation center and the inner diameter reference hole axis and the high possible to improve the working efficiency by matching accuracy next to the also, provide a cutting jigs and tools of the cylindrical workpiece which can simplify the structure can do.

According to the fourth aspect of the present invention, one end of the chuck body is fitted into the fitting hole from above, and the chuck body is disposed at substantially equal intervals on a circumference centered on the axis of the fitting hole. a plurality of support pins slidable and downward in the same plane upper surface for supporting an end surface of the cylindrical workpiece with the set, cylindrical Wah
The center axis of the chuck bore matches the axis of the chuck body.
The lower part of each support pin is held so that the support pin descends, and is smaller than the combined force of the friction force generated when the elastic member of the chip cover rubs the inner periphery of the cylindrical work and the gravity acting on the cylindrical work. And a biasing means for applying a large biasing force to the workpiece so that the axis center of the inner diameter of the cylindrical workpiece and the axis of the chuck main body are aligned with high accuracy, and a gripping force sufficient to oppose the cutting force is provided. It is possible to provide a positioning jig between a cylindrical work and a cutting jig capable of obtaining the above.

According to the fifth aspect of the present invention, one end of the chuck main body is provided with a center hole fitted from above, and the chuck body is disposed at substantially equal intervals on a circumference centered on the axis of the center hole. a plurality of support pins slidable downwardly and at the same plane upper surface for supporting the end face of Rutotomoni cylindrical workpiece, the cylindrical
The center axis of the internal diameter reference hole of the work and the axis center of the chuck body are
As the supporting pins descend so as to coincide with each other, the supporting pins respectively hold the lower portions of the supporting pins and provide biasing means for applying a biasing force slightly larger than the gravity acting on the cylindrical work.
A cylindrical work and a cutting jig that can obtain a gripping force sufficient to oppose the cutting force while aligning the axis center of the inner diameter reference of the cylindrical work with the axis of the chuck body with high precision. A positioning jig can be provided.

Further, according to claim 6 of the present invention, claim
With the chip processing method of the cylindrical work and cutting tool described in 1
During the cutting of the inner periphery of the cylindrical work, a fluid is ejected from the fluid ejection port which moves while maintaining a relative position with respect to the cutter to the chip cover and the inner peripheral surface of the cylindrical work, and the fluid is chipped. By reflecting the light on the inner peripheral surface of the cover and the cylindrical work, a fluid flow is generated in a direction opposite to the rotation of the cylindrical work and from the inside of the cylindrical work to the outside. since so as to discharge the work of the outside that can be discharged to the cylindrical workpiece outside without entangling chips, cylindrical
A method for cutting a workpiece and a cutting jig can be provided.

Further, according to claim 7 of the present invention, claim
The cutting tool for a cylindrical workpiece according to 1, wherein the fluid ejection port is disposed above the mounting surface side of the tool held by the tool shank of the tool holder and behind the tool and in front of the tool and parallel to the feed direction. And a second nozzle for ejecting fluid between the inner surface of the cylindrical work and the bite shank, wherein the fluid ejection port is disposed below and opposite to the mounting surface of the blade and behind the blade. With the above nozzle, it is possible to provide a cutting tool for a cylindrical work capable of discharging chips to the outside of the cylindrical work without entanglement.

Further, according to claim 8 of the present invention, claim
The cutting tool for a cylindrical work according to 1, wherein the respective fluid ejection ports are disposed above the mounting surface side of the blade held by the tool shank of the tool holder and behind the tool, and are forwardly and forwardly of the tool. A first nozzle for injecting fluid in parallel to the direction and a second nozzle for injecting fluid in a direction opposite to the cutting edge of the blade and in a direction away from the mounting surface of the blade in the feed direction; And a chip regulating member having an inclined surface formed at a predetermined elevation angle with respect to the lateral cutting edge of the cutting tool, so that the chip can be more efficiently discharged to the outside of the cylindrical workpiece without entanglement of the chip. It is possible to provide a cutting tool for a cylindrical work.

According to claim 9 of the present invention,
At 7 or 8, the fluid is formed in the tool holder
Supplied to the first and second nozzles via the fluid flow path
So that the chips are more efficiently entangled
It is possible to discharge cylindrical workpieces without
Of course, cylindrical shape that can improve mechanical strength
A work cutting tool can be provided.

According to claim 10 of the present invention,
Item 1.A cutting tool for a cylindrical work according to Item 1, wherein the cutting tool is opened at a position on the side of the cutting tool of the cutting tool of the cutting tool holding tool and at a position behind the cutting tool, and the fluid is supplied in front of the cutting tool and parallel to the feed direction. A first fluid ejection port for ejecting the fluid, and a second fluid ejection port for ejecting the fluid in a direction away from the cutting surface of the blade and away from the mounting surface of the blade, so that the cylinder is formed without tangling chips. It is possible to provide a cutting tool for a cylindrical work that can be discharged to the outside of the work, as well as can be improved in mechanical strength and reduced in size.

According to claim 11 of the present invention,
Item 1.A cutting tool for a cylindrical work according to Item 1, wherein the cutting tool is opened at a position on the side of the cutting tool of the cutting tool of the cutting tool holding tool and at a position behind the cutting tool, and the fluid is supplied in front of the cutting tool and parallel to the feed direction. A first fluid ejection port for ejecting the fluid, a second fluid ejection port for ejecting fluid in a direction away from the cutting surface of the blade and away from the mounting surface of the blade, and the feeding surface of the blade and moving away from the mounting surface. The third fluid ejection port for ejecting the fluid in the direction, and the fourth fluid ejection port for ejecting the fluid in the opposite direction to the cutting edge of the blade and above the tip of the bite shank, so that chips can be more efficiently removed. Of course, it is possible to discharge to the outside of the cylindrical work without entanglement,
It is possible to provide a cylindrical work cutting tool capable of improving mechanical strength and reducing the size.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a configuration of a cutting tool for cutting a cylindrical workpiece according to a first embodiment of the present invention.

FIGS. 2A and 2B are a front view and a side view showing a configuration of a tapered cone in FIG.

FIG. 3 is a cross-sectional view showing a configuration of a first chip cover in FIG.

FIG. 4 is a sectional view showing a configuration of a second chip cover in FIG. 1;

FIG. 5 is a cross-sectional view illustrating a configuration of a cutting tool for cutting a cylindrical work in Embodiment 2 of the present invention.

FIG. 6 is a partial cross-sectional front view showing a configuration of a positioning jig for positioning a cylindrical workpiece and a cutting jig according to a fifth embodiment of the present invention.

FIG. 7 is a plan view showing the configuration of the positioning jig in FIG.

FIG. 8 is a perspective view for explaining the concept of a chip processing method according to a seventh embodiment of the present invention.

FIG. 9 is a top view showing the shape of the cutting edge of the blade.

FIG. 10 is a sectional view taken along line XX in FIG. 9;

11 is a top view showing a cutting edge shape of a blade different from that in FIG. 9;

FIG. 12 is a sectional view taken along lines XII-XII in FIG. 11;

FIG. 13 is a perspective view for explaining the concept of chip processing by a cutting tool for a cylindrical work in Embodiment 8 of the present invention.

14 is a front view showing a configuration of the cutting tool in FIG. 13 in a partial cross section.

FIG. 15 is a left side view showing the configuration of the cutting tool in FIG.

FIG. 16 is a right side view showing the configuration of the cutting tool in FIG.

FIG. 17 is a perspective view for explaining the concept of chip processing of a cylindrical workpiece by a cutting tool according to Embodiment 9 of the present invention.

18 is a front view showing a configuration of the cutting tool in FIG. 17 in a partial cross section.

19 is a left side view showing the configuration of the cutting tool in FIG.

20 is a side view of the state of chip generation at the cutting edge of the cutting tool in FIG. 17 as viewed from the outer diameter side of the work toward the rotation center.

21 is a perspective view of a chip generation state of the cutting edge of the cutting tool in FIG. 17 as viewed from a direction in which a blade is sent.

FIG. 22 is a top view showing the shape of the cutting edge of the cutting tool of FIG. 17;

FIG. 23 is a side view showing the shape of the blade edge of the blade in FIG. 22;

FIG. 24 is a top view showing a cutting edge shape of a blade different from that in FIG. 22;

FIG. 25 is a side view showing the shape of the cutting edge of the blade in FIG. 24;

FIG. 26 is a perspective view for explaining the concept of chip processing by a cutting tool for a cylindrical work in Embodiment 10 of the present invention.

27 is a front view showing a configuration of the cutting tool in FIG. 26 in a partial cross section.

FIG. 28 is a bottom view showing the configuration of the cutting tool in FIG. 26 in a partial cross section.

FIG. 29 is a left side view showing the configuration of the cutting tool in FIG. 26.

FIG. 30 is a cross-sectional view showing a configuration of a conventional cutting jig.

FIG. 31 is a cross-sectional view illustrating a configuration of another different conventional cutting jig.

FIG. 32 is a sectional view showing a configuration of a third different conventional cutting tool.

FIG. 33 is a cross-sectional view showing the configuration of a fourth different conventional cutting tool.

FIG. 34 is a cross-sectional view illustrating a configuration of a fifth different conventional cutting tool.

FIG. 35 is a cross-sectional view showing a configuration of a chip cover provided in an eighth different conventional cutting tool.

FIG. 36 is a cross-sectional view showing a configuration of a chip cover provided on a ninth different conventional cutting tool.

FIG. 37 is a view showing a configuration of a conventional positioning jig.

FIG. 38 is a diagram showing a configuration of another different conventional positioning jig.

FIG. 39 is a view showing the configuration of a third different conventional positioning jig.

FIG. 40 is a plan view showing a configuration of a conventional cutting tool.

FIG. 41 is a front view showing a configuration of the cutting tool in FIG. 40 in a partial cross section.

[Explanation of symbols]

1 cylindrical work, 1a inner diameter reference hole, 2 collets,
2a, 2b Taper portion, 3 chuck body, 3a, 3b
Center hole, 3c tapered outer peripheral part, 3d screw part, 1
4 turning center, 15 lathe spindle, 16 stop center, 39 taper cone, 39b tapered outer periphery, 3
9c slit, 40 first chip cover, 42, 49
Neoprene rubber plate (plate-like elastic member), 43, 50 first plate-like member, 45, 52 second plate-like member, 46, 5
3 Third plate member, 47 Second chip cover, 54
Vibration suppression member, 55 jig body, 55a receiving surface, 55b
Fitting holes, 56 support pins, 57 compression coil springs (biasing means), 60 positioning jigs, 61, 62 fluid ejection nozzles, 61a, 62a fluid ejection ports, 63, 73,
84 byte shank, 64, 74 blade, 66, 82
Chips, 67, 71, 83 byte holders, 67a, 7
1a, 83a, 84a fluid path, 69, 75 first nozzle, 70, 76 second nozzle, 69a, 70a,
75a, 76a Fluid ejection port, 79 Chip control member, 8
4b first fluid jet, 84c second fluid jet,
84d third fluid outlet, 84e fourth fluid outlet.

Continued on the front page (72) Inventor Motoichi Ukioka 3-181-1, Oka, Shizuoka-shi Mitsubishi Electric Corporation Shizuoka Works (72) Inventor Naofumi Ozawa 3-181, Oka, Shizuoka-shi Mitsubishi Electric Corporation (72) Inventor Yoshito Yamada 8-1-1, Tsukaguchi-Honmachi, Amagasaki-shi Mitsubishi Electric Corporation In-house Research Institute of Industrial Technology (56) References JP-A-53-63681 (JP, A) JP-A Sho 63-191509 (JP, A) Japanese Utility Model Showa 63-147207 (JP, U) Japanese Utility Model Application No. 1-125147 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B23B 31/20 B23B 25/00 B23B 31/00 B23B 31/40 B23Q 11/00

Claims (11)

(57) [Claims] 1. A first slit which fits into the inner diameter reference hole of a cylindrical work having an inner diameter reference hole, has a tapered portion formed at the inner peripheral surfaces at both ends, and extends in the axial direction from the both ends. And a first taper which is partially formed with a tapered center hole formed at both end faces and fitted in the first tapered portion at one end of the collet. and the first small diameter rod-shaped screw portion on an end portion outer peripheral face positioned is formed on the side chuck body of the tapered outer peripheral portion and having a Jogaishu portion, one end slidably fitted in the chuck body Into the second tapered portion on the other end of the collet
And a second tape Pakon in which slits are a plurality of formed circumferentially extending axially from the one end side and having a second tapered outer circumferential portion, the first tape of the collet
The tapered portion slides on the first tapered outer peripheral portion of the chuck body.
At the same time, the first slit of the collet
Is expanded in the radial direction and the taper cone
The second tapered outer peripheral portion is the second tapered portion of the collet.
To the upper part by the second slit of the tapered cone.
The inner diameter of the tapered cone is reduced, the outer peripheral surface is in contact with the inner peripheral surface of the cylindrical work, and a plate-like elastic member formed in a ring shape, and the outer periphery is fitted to the inner periphery of this plate-like elastic member. A first plate-shaped member having a thickness smaller than the thickness of the plate-shaped elastic member, and an outer diameter slightly smaller than an inner diameter of the cylindrical work, wherein the plate-shaped elastic member and the first plate-shaped member are disposed on both sides. And a chip cover comprising second and third plate members fixed at the position of the first plate member and held on the chuck main body near the inner peripheral cutting end of the cylindrical work. A jig for cutting a cylindrical workpiece. 2. A is integrated with the surrounding center engaged tapered center hole of the chuck body one end is fixed coaxially to the main axis of the lathe, if the chuck body and the cylindrical workpiece
3 times or more the total mass and 15 times the total moment of inertia
The cutting tool for cutting a cylindrical work according to claim 1 , further comprising a disk-shaped vibration suppressing member having inertia twice or more . 3. A cylindrical work and a chuck main body are provided at a rotation center engaged with a tapered center hole on one end side of the chuck body.
More than 3 times the total mass of the body and the total moment of inertia
2. A cutting tool for a cylindrical workpiece according to claim 1 , wherein the inertia of the cylindrical workpiece is at least 15 times the inertia. 4. A cylindrical workpiece and a cutting jig according to claim 1.
A positioning jigs and tools of the tool, and a fitting hole chuck body one end is fitted from above, the cylindrical workpiece while being arranged at substantially equal intervals on the circumference around the fitting hole A plurality of support pins whose upper end faces supporting the end faces are flush with each other and are slidable downward ;
When the axis of the chuck matches the axis of the chuck body, the support pin
So it lowered, slightly than the resultant force of the gravitational force acting on the frictional force and the cylindrical workpiece elastic member of the chip cover respectively hold the lower portion of each support pin is generated when the rubbing an inner periphery of the cylindrical workpiece A positioning jig for positioning a cylindrical work and a cutting jig, comprising an urging means for applying a large urging force to the cylindrical work. 5. The method according to claim 1, wherein the cylindrical workpiece having an inner diameter reference hole is provided.
Fits inside diameter reference hole, and taper is formed on both inner peripheral surfaces
And a first slit extending in the axial direction from both ends.
A cylindrical collet formed with a plurality of
A tapered center hole is formed in the end face, and the
G outside the first tapered shape that fits into the first tapered portion on one end side
Having a peripheral portion and a small diameter of the first tapered peripheral portion.
Rod-shaped tip with a threaded portion on the outer peripheral surface of the end located on the side
And the chuck body is slidably fitted to the chuck body.
The other end of the collet is fitted to the second tapered portion at the other end.
It has a second tapered outer periphery and from the one end side
A plurality of second slits extending in the axial direction are formed in the circumferential direction
And a first taper of the collet.
The tapered portion slides on the first tapered outer peripheral portion of the chuck body.
At the same time, the first slit of the collet
Is expanded in the radial direction and the taper cone
The second tapered outer peripheral portion is the second tapered portion of the collet.
To the upper part by the second slit of the tapered cone.
A cylindrical work with a reduced inner diameter of the taper cone
In a positioning jig with a cutting jig, a center hole into which one end of the chuck body is fitted from above, and a cylindrical work which is disposed at substantially equal intervals on a circumference around the axis of the center hole. A plurality of support pins whose upper end faces supporting the end faces of the cylindrical workpiece are flush with each other and are slidable downward;
The axis of the inner diameter reference hole matches the axis of the chuck body.
And a biasing means for holding a lower portion of each of said support pins so as to lower said support pins so as to apply a biasing force slightly larger than gravity acting on said cylindrical workpiece. positioning tools of the cutting tools and. 6. A cylindrical workpiece and a cutting jig according to claim 1.
A method of processing chips with a tool, wherein during cutting of the inner periphery of a cylindrical work, a fluid is discharged from a fluid ejection port moving while maintaining a relative position with a blade to a chip cover and the inner peripheral surface of the cylindrical work. By reflecting this fluid on the chip cover and the inner peripheral surface of the cylindrical work,
A flow of fluid from the inside of the cylindrical work to the outside is generated in a direction opposite to the rotation of the cylindrical work, and chips are discharged to the outside of the cylindrical work by the flow of the fluid. Characteristic cylindrical workpiece and cutting
Chip disposal method with jigs and tools . 7. A cutting tool for a cylindrical work according to claim 1.
Wherein a fluid ejection port is disposed above the mounting surface side of the blade held by the bite shank of the bite holder and behind the blade, and injects fluid in front of the blade and parallel to the feed direction. And a second nozzle having a fluid ejection port disposed below and opposite to the blade mounting surface and behind the blade to inject fluid between the inner surface of the cylindrical work and the bite shank. A cutting tool for a cylindrical work. 8. A cutting tool for a cylindrical workpiece according to claim 1.
A is is and arranged behind the said edge at the mounting surface side above the blade, each of the fluid ejection opening is held in the byte shank byte retainer parallel to eject fluid and and feed direction in front of said edge A first nozzle and a second nozzle for injecting fluid in a direction opposite to the cutting edge of the blade and in a direction away from a mounting surface of the blade in a feed direction; A cutting tool for a cylindrical work, comprising: a chip control member having a slope formed at a predetermined elevation angle with respect to a lateral cutting edge of a cutting tool. 9. The cylindrical workpiece according to claim 7, wherein the fluid is supplied to the first and second nozzles through a fluid flow path formed in the tool holder. Cutting tools. 10. A cutting work for a cylindrical work according to claim 1.
Tools, each of which is opened at a position on the mounting surface side of the tool of the tool shank of the tool holder and at a position behind the tool,
A first fluid ejection port for ejecting fluid in front of the blade and in parallel with the feed direction, and a second fluid ejection port for ejecting fluid in a direction toward the cutting edge of the blade and away from the mounting surface of the blade.
A cutting tool for a cylindrical work, comprising: 11. A cutting work for a cylindrical work according to claim 1.
Tools, each of which is opened at a position on the mounting surface side of the tool of the tool shank of the tool holder and at a position behind the tool,
A first fluid ejection port for ejecting a fluid in front of the blade and in parallel with a feed direction, and a second fluid ejection for ejecting a fluid in a direction toward a cutting edge of the blade and away from a mounting surface of the blade. A third fluid ejection port for ejecting fluid in a direction in which the cutting tool is fed in a direction away from the mounting surface, and a fluid ejecting in a direction opposite to the cutting edge of the cutting tool and above a tip end of the bite shank; A cutting tool for a cylindrical work, comprising: