JP7194888B2 - Internal Diameter Machining Increase/Decrease Diameter Honing Grinding Wheel - Google Patents

Description

The present invention relates to a honing grindstone that polishes while increasing or decreasing the outer diameter of the grindstone with respect to the inner diameter of the work material. , is a honing wheel for increasing/decreasing inner diameter machining capable of high-precision machining.

In recent years, a large number of inner diameter processing diameter increasing honing units, honing heads, and honing control devices for honing the inner diameter surface of a work material using a honing grindstone for increasing or decreasing the inner diameter of the work material have been provided.

First, there is a honing tool capable of controlling the radial direction of the honing tool so as to perform highly accurate drilling without being affected by abrasion of the honing grindstone.
The structure consists of a main shaft that rotates with the honing unit attached to the tip, and a honing unit control mechanism that provides relative rotation to the main shaft by numerical control to a control shaft provided through the main shaft. wherein the honing unit engages with the control shaft and rotates together with the control shaft, a screw formed at the tip of the connection shaft meshes with the rotation of the connection shaft to move in the axial direction. A nut, a radial control shaft that is connected to the nut and moves in the axial direction, is disposed on the peripheral surface of the radial control shaft, and axial movement of the radial control shaft moves the honing grindstone in the radial direction. A numerically controlled honing device comprising a honing tool and capable of controlling the honing tool in the radial direction even during rotation of the spindle (see, for example, Patent Document 1).

Next, there is a bottomed hole honing head that is suitable for improving the accuracy of honing the inner surface of a cylinder with a bottomed hole, particularly the accuracy of straightness.
The honing wheelhead 5 is movably supported in the radial direction along the outer circumference of a cylindrical honing head main body 7. The taper cone 2b accommodated in the honing head main body 7 is axially moved independently of the taper cone 1a. is a honing head for drilling bottomed holes configured to forcibly expand the non-stop side portion of the wheelhead in the radial direction as it moves toward the non-stop side of the machined hole (see, for example, Patent Document 2). .

Further, there is a honing processing control device suitable for stabilizing quality, shortening the processing time, and extending the life of the grindstone, mainly by improving the shape accuracy of the honing processing.
The configuration includes pressure values at points A, B, and C detected by piezoelectric elements mounted on a plurality of honing wheelheads 5 supported by the honing head body 7, and pressure values at points A, B, and C measured by an air micrometer 13. It is a honing processing control device having an arithmetic control unit that inputs an inner diameter value, outputs and controls the amount of movement in the axial direction of the first taper cone 1 and the second taper cone 2, and corrects the accuracy of the cylindrical inner surface of the workpiece. (For example, see Patent Document 3.).

Further, the truing accuracy of high-hardness honing grindstones such as diamond grindstones or CBN grindstones is enhanced.
The configuration is such that center holes 15 and 16 are formed in both end faces of an extension rod 9 for expanding and contracting the honing grindstone 7 together with the grindstone shoe 6 . After adjusting the adjusting nut 29 to a predetermined expanded state, the entire honing head 1 is supported by the centers 32 and 33 of the cylindrical grinder using the center holes 15 and 16, and the truing grindstone G is applied. Grind. At the time of honing, the adjust nut 29 is removed and a push rod is connected to the internal thread portion 17 (see, for example, Patent Document 4).

Furthermore, there is a honing device that suppresses the wear of the taper cone and improves the life.
The taper cone 5 formed integrally with the spindle 2 has a tapered contact surface 5a with the honing table 6. As shown in FIG. A honing grindstone 4 is formed on the outer peripheral portion of the honing table 6 , and the honing grindstone 4 is in contact with the workpiece 7 . The taper cone 5 rotates and descends as the main shaft 2 rotates, and the honing base 6 is pushed out in the outer peripheral direction via the contact surface 5a by the descent of the taper cone 5 . As a result, the honing grindstone 4 provided on the outer peripheral portion of the honing table 6 is pressed against the work material 7, and the work material 7 is ground and finished to a predetermined size (see, for example, Patent Document 5). .).

JP-A-8-216015 JP-A-5-004163 JP-A-5-277928 JP-A-2000-6001 JP 2004-268197 A

As cited in Patent Documents 1 to 5, almost all of the conventional honing grindstones that increase or decrease in diameter with respect to the inner diameter of the work material are cylindrical honing heads, as seen in Japanese Patent Application Laid-Open No. 5-004163. The honing wheelhead, which is radially movably supported along the outer circumference of the main body, moves to the stop side of the machined hole by moving the taper cone accommodated in the honing head body in the axial direction independently of the taper cone. The honing head for drilling a bottomed hole is configured to forcibly expand the non-stop side portion of the wheelhead in the radial direction as the honing head increases.

However, the taper cone accommodated in the honing head main body moves in the axial direction independently of the taper cone, thereby forcibly expanding the stop side portion of the wheelhead in the radial direction as it moves toward the stop side of the machined hole. A honing head for bottom hole machining and others is a diameter-increasing honing grindstone for machining that increases or decreases the outer diameter of the honing grindstone by mechanical means. For this reason, there is a mechanical friction part, and the taper cone is mechanically forcibly controlled for fine movement in the axial direction of the rotating main shaft. In addition to this, there is also the problem that mechanical stress is applied to the grindstone, making it difficult to obtain a highly accurate ground surface.

That is, because of this, there are problems such as the life of the inner diameter machining increasing/decreasing diameter polishing honing grindstone for polishing and honing the inner diameter surface of the work material and the accuracy for honing the inner diameter surface of the work material is difficult to obtain. be pointed out.

In view of the various problems associated with the conventional hole processing honing heads as described above, the inventors of the present application have developed a novel coolant liquid that supplies the inside of the grindstone with the characteristic performance of increasing and decreasing the diameter, which is particularly required for balloon grindstones. We have researched and developed an increasing/decreasing diameter polishing honing grindstone for inner diameter processing that can perform from polishing to honing/lapping by using a grindstone that increases/decreases the diameter of a balloon or cylindrical body by pressure and waveform control.

The two basic principles of the inner diameter processing, increasing/decreasing diameter polishing honing grindstone, which is the object of the present invention, will be briefly described with reference to FIG. The first grindstone means is a diameter-reducing grinding honing in which the diameter of the cylindrical body 4 is increased or decreased by the pressures P1, P2, P3 (sin curve) of the coolant liquid from the coolant device shown in FIG. 14(a). As shown in FIG. 14(c), in this specific configuration, a large number of slit grooves L are formed in the outer peripheral wall surface 4a of the cylindrical body 4, and the abrasive grains 13 are adhered to the surface of the peripheral wall surface 4a. wearing). In the form of inserting coolant liquid (inside expressed as balloon F) inside this, the pressure of coolant liquid sent into the cylindrical body P1, P2, P3 (sin curve) fluctuations The pressure of the coolant liquid acts as an actuator. As a result, the diameter of the outer peripheral wall surface 4a of the cylindrical body 4 is increased, and the inner surface of the work material is polished and honed with the original cooling action of the coolant.

14(b) shows the second grindstone means. The configuration is such that a large number of small holes h are formed in the peripheral wall surface 4a' of the sheet metal cylindrical body 4', and a balloon F is inserted into the hole. When the pulsating pressure is strong, a portion F1 of the balloon F radiates out from a large number of small holes h in the peripheral wall surface 4a', and the abrasive grains 13 on the convex surface polish and hon the inner diameter of the work material. In other words, the balloon serves as the polishing/honing function of the whetstone.

The 1st grinding wheel means and the 2nd grinding wheel means for achieving the above object are constructed as follows.
The first grinding wheel means comprises a grinding wheel mounting spindle with a center through opening, and a small diameter section and a large diameter section alternately connected to the tip of the grinding wheel mounting spindle. A grindstone mounting shaft portion having a small hole connected to the center through in the small diameter portion in the outer diameter direction; Abrasive grains are affixed to the outer periphery of the rubber cylindrical body, and both ends of the rubber cylindrical body are fitted with tapered screws to prevent liquid leakage from the wheel mounting shaft. is airtightly enclosed and fixed to the grinding wheel mounting shaft, and the diameter of the rubber cylindrical body is increased or decreased by controlling the pressure of the coolant liquid sent into the rubber cylindrical body through the small hole of the grinding wheel mounting shaft. in
A plurality of chip pocket grooves are axially cut on the outer peripheral wall of the rubber cylinder, and a plurality of idling stopper protrusions are axially provided on the inner peripheral wall, and the protrusions are attached to the grindstone. It is characterized in that it is fitted to the large-diameter portion of the shaft.

According to claim 2 , in the inner diameter machining diameter increasing/decreasing honing grindstone of claim 1 , the gap between the small diameter portion and the large diameter portion alternately connected to the tip of the grinding wheel mounting spindle is narrowed at the center position. characterized in that it is a grindstone mounting shaft portion that has been ground .

According to the inner diameter processing diameter increasing/decreasing honing grindstone of claim 1, a plurality of chip pocket grooves are cut in the axial direction on the outer peripheral wall of the rubber cylindrical body, and a plurality of idling stopper protrusions are formed on the inner peripheral wall. A plurality of chip pocket grooves provided on the outer peripheral wall of the cylindrical body are arranged to protrude in the axial direction, and the protuberances are fitted to the large-diameter portion of the spindle for mounting the grinding wheel. It is placed on the workpiece and is discharged positively toward the inner diameter of the work material. That is, honing and lapping of the inner diameter of the work material can be performed efficiently and accurately.

According to the honing grindstone for inner diameter processing of claim 2, in the honing grindstone for inner diameter processing of claim 1, the gap between the small diameter portion and the large diameter portion alternately connected to the tip of the grindstone mounting spindle is formed at the center position. Since the grinding wheel mounting shaft is narrowed, the outer peripheral wall of the rubber cylindrical body can be easily increased and decreased in diameter evenly around the center and at both ends, so honing and lapping of the inner diameter of the work material can be efficiently performed. It can be performed with high precision.

1 is a system diagram of an inner diameter machining increasing/decreasing diameter honing grindstone and a coolant device, showing the first embodiment of the present invention. FIG. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a honing grindstone for increasing/decreasing diameter for inner diameter processing, showing a first embodiment of the present invention; It is a perspective view of a cylinder, showing a second embodiment of the present invention. FIG. 10 is a cross-sectional view of a cylindrical body with abrasive grains fixed to its surface, showing a third embodiment of the present invention; FIG. 4 is a cross-sectional view of a honing grindstone for increasing/decreasing diameter for inner diameter processing, showing a fourth embodiment of the present invention. FIG. 5 is a cross-sectional view of an inner diameter processing variable diameter honing grindstone, showing a fifth embodiment of the present invention. FIG. 8 shows a sixth embodiment of the present invention, showing a perspective view of a state where abrasive grains are fixed to a cylindrical body, and a cross-sectional view of a main part. 1 shows first and second embodiments of the present invention, and is an external perspective view of each embodiment. FIG. It is a perspective view which shows 7th Example of this invention and adhered the abrasive grain to the wire-mesh cylindrical body. 8 is a perspective view and a cross-sectional view of a cylindrical body with rubber piece abrasive grains, showing an eighth embodiment of the present invention. FIG. Fig. 11 is a working perspective view of a honing grindstone in which a rubber balloon is fitted in a cylindrical body with a small hole, showing a ninth embodiment of the present invention; FIG. 4 is a cross-sectional view of the grinding action, showing the action of the first embodiment of the present invention; FIG. 4 is a cross-sectional view of the automatic centering mechanism, showing the action of each embodiment of the present invention; FIG. 2 shows each embodiment of the present invention and is a principle diagram of diameter increase/decrease of each diameter increasing/decreasing honing grindstone for inner diameter processing. FIG. 4 is a cross-sectional view of a representative grinding action of the inner diameter processing variable diameter honing grindstone, showing the action of the first embodiment of the present invention.

1 to 15, each configuration of the inner diameter processing diameter increasing/decreasing honing grindstone of the present invention, other inner diameter processing diameter increasing/decreasing honing grindstones related thereto, and a specific processing method using each inner diameter processing diameter increasing/decreasing honing grindstone. will be described in order.

As described above, the "first grindstone means" of the present invention is such that the pressures P1, P2, and P3 (sin curve) of the coolant liquid from the coolant device (described later) shown in FIG. is an increasing/decreasing diameter grinding honing. This specific configuration can be seen in FIG. The configuration, action and effect of each cylinder 4, 4', 5, 6, 8 and 9 are designed to be changed little by little.

First, the inner diameter processing variable diameter honing grindstone 10 of the first embodiment will be described in detail with reference to FIGS. 1, 2 and 15. FIG. It consists of a grinding wheel mounting spindle S with a center through 1 open, and a small hole connecting a small diameter part 2a and a large diameter part 2b to the tip of the grinding wheel mounting spindle S and connecting the center through 1 to the small diameter part 2a. A grindstone mounting shaft portion 3 opening in the outer diameter direction at 2c, and an inner wall surface 4b of a rubber cylindrical body 4 on the grindstone mounting shaft portion 3 are fitted to the large diameter portion 2b, and both ends of the rubber cylindrical body 4 are fitted. The portions 4d and 4e surround the grindstone mounting shaft portion 3 in an airtight manner. As shown in FIG. 2, the rear end portion 4e of the rubber cylindrical body 4 is butted against the rear end nut 3a of the grindstone mounting shaft portion 3, and the front end portion 4e is aligned with the tip large diameter portion 2b of the grindstone mounting shaft portion 3, The cylindrical body 4 is airtightly enclosed and fixed to the grindstone mounting shaft portion 3 by a tapered screw N screwed into the axial center of the tip large diameter portion.

A coolant CK fed from a coolant device 50 (to be described later) into the rubber cylinder 4 having various abrasive grains 13 fixed to the outer peripheral surface 4a through the small hole 2c of the grindstone mounting shaft 3. Pressure (static pressure or pulsating pressure) increases or decreases the diameter of the rubber cylinder 4 like a balloon wheel. As a result, the inner diameter machining increasing/decreasing diameter honing grindstone 10 grinds and hones the inner diameter W1 of the work material W to be cut.

The principle of the processing method for simultaneously processing the entire length and the entire surface of the hole inner diameter W1 of the work W will be briefly described with reference to FIG. The hole inner diameter Φa of the work material W is obtained by rough machining, and the outer diameter Φb of the rubber cylindrical body 4 of the inner diameter machining variable diameter honing grindstone 10 is defined as Φa>Φb. Then, when the coolant liquid CK from the coolant supply device 50 (to be described later) is turned on by the pulsation of the coolant pump, the pulsating pressure "P1, P2, P3" adheres the abrasive grains 13 from the grindstone mounting spindle S opened to the center through 1. The coolant is fed into the rubber cylindrical body 4, and the diameter of the cylindrical body 4 is controlled by the coolant liquid. 4A, the rubber cylindrical body 4 is inserted into the hole inner diameter Φa of the workpiece W. In FIG. In (B), when the pulsation of the coolant pump is turned on, the coolant liquid CK at pulsation pressures "P1, P2, P3" is press-fitted into the rubber cylindrical body 4, filling the gap between the outer circumference 4a and the hole inner diameter W1. In (C), when the pulsating pressure increases, the balloon is inflated and Φa<Φb, and the rubber cylinder 4 is pressed against the inner diameter W1 of the hole and is being ground. Subsequently, in (D), when the pulsating pressure decreases and the balloon deflates, Φa>Φb, and the rubber cylindrical body 4 shrinks and is being cooled. Furthermore, in (E), when the pulsating pressure increases, the balloon expands and Φa<Φb, and the rubber cylinder 4 presses against the inner diameter W1 of the hole and is being ground. Then, in (F), when the pulsating pressure decreases and the balloon deflates, Φa>Φb, and the rubber cylindrical body 4 shrinks and is being cooled. By repeating the expansion (during grinding) and contraction (during cooling) of the balloon described above, the ground surface is polished, honed, and polished, simultaneously processing the entire length and the entire surface of the hole inner diameter W1. When the machining is completed, the pulsation of the coolant pump is turned off, Φa>Φb, and the honing grindstone 10 is pulled out from the inner diameter W1 of the hole of the workpiece W, and the process is completed.

As shown in FIG. 1, the control of the coolant liquid, which plays a central role in the implementation of the above-described machining method, is based on a constant static pressure in which the coolant liquid CK from the coolant supply device 50 is controlled by the NC program PG from the NC controller 60. A coolant liquid CK with pressure P0" to pulsating pressures "P1, P2, P3" is sent from the grinding wheel mounting spindle S opened in the center through 1 into the cylindrical body on which the abrasive grains 13 are fixed. are controlled to increase/decrease diameters in four types.

Details thereof will be described in detail below with reference to FIG. In FIG. 1, the coolant supply device 50 includes a two-cylinder plunger pump P (single-cylinder AC, BC) that supplies the coolant liquid CK in the tank T by a motor MO as a drive source, and the plunger pump P discharges the coolant liquid CK. Equipped with check valves V1 to V5 and switching valves V6 and V7 for switching the coolant liquid CK with pulsating pressure in various ways. By switching the check valves V1 to V5, a route is formed for piping and supplying four types of coolant liquids CK to the grinding wheel 10 for increasing/decreasing diameter for inner diameter machining. Under the control of the NC program PG from the NC control device 60, the coolant liquid CK to be discharged is controlled by the pressure P1 of the single cylinder AC, the pressure P2 of the single cylinder BC, the combined pressure (P1+P2) P3 of both, and the combined pressure (P1+P2) P3 is put into the accumulator AQ and it is switched to 4 kinds of constant pressure P0.

The polishing and honing action of the inner diameter machining increasing/decreasing diameter honing grindstone 10 according to the first embodiment will be specifically described.
First, the inner diameter increasing honing grindstone 10 for increasing or decreasing the inner diameter W1 of the work material W will be described. In FIG. 12(a), a rubber cylindrical body 4 is fitted to a grindstone mounting shaft 3 connected to a spindle S of a grinder (not shown), and the coolant liquid CK is stopped to reduce the diameter. Get to polishing. In FIG. 12(b), a rubber cylindrical body 4 in a reduced diameter state is inserted into the inner diameter W1 of the work material W, and the diameter-increasing honing grindstone 10 for inner diameter processing starts to rotate. Subsequently, in FIG. 12(c), a pulsating coolant liquid CK such as the pressure P1 of the single cylinder AC, the pressure P2 of the single cylinder BC, and the combined pressure (P1+P2) P3, P0 of both is supplied into the rubber cylinder 4. As a result, the diameter of the rubber cylindrical body 4 is pulsatingly increased, and the abrasive grains 13 on the outer peripheral surface 4a grind and hon the inner diameter W1 of the material W to be cut. At this time, the superabrasive grains 13 on the outer peripheral surface 4a wash off the grinding dust and abrasive grains with the static pressure or pulsating grinding fluid CK during grinding of the grinding surface, and grinding is performed. After honing, as shown in FIG. 12(d), the coolant CK is stopped to reduce the diameter, the honing grindstone 10 is removed from the inner diameter W1 of the workpiece W, and the honing action is completed.

In the honing action, the automatic centering mechanism 70 works when the pulsating coolant CK is supplied into the rubber cylindrical body 4 and the cylindrical body 4 pulsates and increases in diameter. Details thereof will be described with reference to FIG. First, in FIG. 13(1), there is an axial misalignment between the grindstone 10 and the workpiece W, and the grindstone 10 is inserted into the workpiece W as it is, as shown in FIG. 13(2). Subsequently, as shown in FIG. 13(3), when the pulsating coolant CK is supplied into the rubber cylindrical body 4 and the diameter of the cylindrical body 4 increases due to pulsation, the automatic centering mechanism operates, and the grinding wheel shaft moves to the workpiece W. , and is centered. Thereafter, as shown in FIG. 13(4), grinding is started, and as shown in FIG. 13(5), the diameter of the rubber cylindrical body 4 is pulsatingly increased and decreased for grinding. Finally, as shown in FIG. 13(6), the coolant CK is stopped, the grindstone 10 after grinding is removed from the workpiece W, and the grinding/honing process is completed at the same time as the automatic centering mechanism 70 operates.

The inner diameter machining diameter increasing/decreasing honing whetstone 10 of the second embodiment shown in FIG. is incised. The rest of the configuration is the same as that of the honing grindstone 10 for increasing/decreasing the diameter for inner diameter processing of the first embodiment, so the description thereof will be omitted. Incidentally, in the inner diameter processing diameter increasing/decreasing honing grindstone 10 and the inner diameter processing diameter increasing/decreasing honing grindstone 12, the rubber cylinders 4 and 4' are made of any rubber such as natural rubber, synthetic rubber, petroleum resin, and the like. . An external view thereof is shown in FIG.

As shown in FIG. 1, the coolant liquid CK from the coolant supply device 50 is supplied to the center through 1 at the rear end of the grinding wheel mounting spindle S of the inner diameter machining increasing/decreasing diameter honing grinding wheel 12 by the NC program PG from the NC controller 60. A coolant liquid CK having a controlled static pressure of "constant pressure P0" to pulsating pressure of "P1, P2, P3" is fed into the cylindrical body to which the abrasive grains 13 are fixed from the grinding wheel mounting spindle S opened in the center through 1, and the coolant liquid is fed into the cylindrical body. The diameter of the cylindrical body 4 is controlled to increase or decrease in four types by pressure.

As a result, the inner diameter processing variable diameter honing grindstone 12 can obtain the same polishing and honing action as the inner diameter processing variable diameter honing grindstone 10 described above. According to this sheet metal cylindrical body 4', since a plurality of slit grooves 4c are cut in the outer peripheral wall 4a in the axial direction, as shown in FIG. Since a large amount of the abrasive is supplied to the entire inner diameter W1, excellent cooling, polishing and honing actions and effects resulting therefrom can be obtained.

Further, in the inner diameter machining diameter increasing/decreasing honing grindstone 20 of the third embodiment shown in FIG. Abrasive grains 13 are fixed (crimped, adhered, etc.) to the outer peripheral wall 4a while being cut in the axial direction. A plurality of idling stopper projections 5 are provided on the inner peripheral wall 4b in the axial direction.

As a result, the same polishing and honing actions and effects as those of the diameter-increasing honing grindstone 10 for inner diameter processing can be obtained. In particular, a plurality of chip pocket grooves 4f are axially cut in the outer peripheral wall 4a of the rubber cylindrical body 4, and a plurality of anti-slip protrusions 5 are axially provided in the inner peripheral wall 4b. The flow of coolant sprayed from the outside onto the outer peripheral wall 4a of the rubber cylindrical body 4 is good, and the discharge of grinding liquid chips and abrasive grain chips is good, and the finish accuracy of the honing surface is guaranteed. In addition, the rubber cylindrical body 4 does not slip due to the idling stopper projection 5, and the entire inner diameter W1 of the work material W can be efficiently polished and honed.

Further, in the inner diameter machining diameter increasing/decreasing honing 21 of the fourth embodiment of the present invention, as shown in FIG. The gap X between the portion 3b and the gap X1 at the center position is narrowed. Other configurations are the same as those of the diameter-increasing honing grindstone 10 for inner diameter processing. Further, as in the fifth embodiment shown in FIG. 6, the diameter-increasing honing grindstone 22 for inner diameter processing is formed by increasing the thickness of the central portion 5a of the rubber cylindrical body 5 similar to the rubber cylindrical body 4 or by increasing the thickness of the rib 5L. is attached to the grindstone mounting shaft portion 3. Other configurations are the same as those of the honing grindstone 10 for increasing/decreasing diameter for inner diameter processing.

Thus, the inner diameter machining increasing/decreasing diameter honing grindstones 21 and 22 can obtain the same polishing/honing actions and effects as the honing grindstone 10 described above. In particular, the gap X between the small-diameter portion 3a and the large-diameter portion 3b is narrowed at the central position, the thickness of the central portion 5a of the rubber cylindrical body 5 is increased, or the rib 5L is provided, so that the pressure P1 of the single cylinder AC , the pressure P2 of the single cylinder BC, and the combined pressure (P1+P2)P3 of both cylinders BC. Thus, the entire inner diameter W1 of the workpiece W can be ground and polished with high accuracy.

In addition, as shown in FIG. 7, the diameter increasing/decreasing diameter honing grindstone 23 for inner diameter processing according to the sixth embodiment of the present invention has abrasive grains 13 scattered and fixed in one or more layers on the entire surface of the rubber cylinder 4. It is. Other configurations are the same as those of the honing grindstone 10 for increasing/decreasing diameter for inner diameter processing. In addition, the action and effect are also the same.

Further, as shown in FIG. 9, a diameter increasing/decreasing diameter honing grindstone 25 for inner diameter processing according to the seventh embodiment of the present invention includes a wire mesh cylindrical body 8 formed by forming the rubber cylindrical body 4 with a wire mesh, and a grinding wheel on the surface of the wire mesh. The grains 13 are electrodeposited, crimped, or adhered. According to this embodiment, the wire mesh cylindrical body 8 is flexibly increased or decreased in diameter by increasing or decreasing the pressures P1, P2, and P3 of the coolant liquid CK, and polishing, honing, and polishing can be performed easily and precisely.

And, as shown in FIG. 10, the diameter increasing/decreasing diameter honing grindstone 26 of the eighth embodiment of the present invention has a rubber cylindrical body 9 or a sheet metal cylindrical body like the rubber cylindrical body 4, and has an outer peripheral surface 9a. A rod-shaped grindstone 13B having abrasive grains 13 attached thereto is adhered to it.

Therefore, according to the inner diameter machining diameter increasing/decreasing honing grindstone 23, as shown in FIG. With four types of pulsating or static pressure coolant liquids CK having a pressure P0, diameter increase/decrease due to pulsation or static pressure is spread radially evenly over the entire length of the cylindrical body 6 . 12 and 13, and the grinding, polishing, and honing actions of the inner diameter W1 of the work material W are performed smoothly and accurately.

Further, according to the diameter increasing/decreasing diameter honing grindstone 25 for inner diameter processing, as shown in FIG. The pressure P1 of the single cylinder BC, the pressure P2 of the single cylinder BC, the combined pressure (P1+P2) P3 of both, and the constant pressure P0 are four types of pulsating or static coolant liquid CK. Even with pressure, the diameter increases and decreases uniformly and radially. 12 and 13, and the grinding, polishing, and honing actions of the inner diameter W1 of the work material W are performed smoothly and accurately.

In addition, according to the inner diameter machining diameter increasing/decreasing honing grindstone 26, as shown in FIG. is made of rubber, and abrasive grains 13 are attached to the outer peripheral surface 9a, so there are four types of pressure P1 of the single cylinder AC, pressure P2 of the single cylinder BC, combined pressure (P1+P2) P3 of both, and constant pressure P0. With a pulsating or static pressure coolant liquid CK, the radial increase and decrease in diameter are carried out uniformly over the entire length of the rubber cylinder 9 even with a relatively weak pulsation or static pressure. 12 and 13, and the grinding, polishing, and honing actions of the inner diameter W1 of the work material W are performed smoothly and accurately.

Next, the "second grindstone means" of the present invention is shown in FIG. A balloon F is inserted inside, coolant liquid is injected into the balloon F, and at the timing when the pulsating pressures of pressures P1, P2, and P3 are strong, a part F1 of the balloon F radiates from a large number of small holes h of the peripheral wall surface 4a'. The inner diameter W1 of the workpiece W is polished and honed by the abrasive grains 13 on the convex surface. That is, the part F1 of the balloon F functions as a grindstone polishing/honing function.

A specific configuration is also shown in FIG. In the inner diameter machining diameter increasing/decreasing honing grindstone 10 of the first embodiment, the inner diameter machining diameter increasing/decreasing honing grindstone 27 is used. It is composed of a thin rubber cylinder having fine abrasive grains 13a fixed to the inner wall surface 11a (4b') of a cylindrical body 11 (4') made of perforated sheet metal with a large number of small holes 11b (h). A cylindrical body 11 (4') is formed by fitting 14 (F). In the cylindrical body, four types of pulsating or static coolant liquids CK, which are the pressure P1 of the single cylinder AC, the pressure P2 of the single cylinder BC, the combined pressure (P1+P2) P3 of both, and the constant pressure P0, are placed in the thin rubber cylinder 14 (F). ), the rubber piece 14a (F1) bulges out from a large number of small holes 11b (h) of the cylindrical body 11 (4') to increase the diameter of the inner diameter honing grindstone 27. is.

Further, the inner diameter processing diameter increasing/decreasing diameter honing grindstone 27 changes the hole diameter at each position, changes the hole position, or changes the hole density so that the amount of protrusion of the thin rubber cylinder 14 from the small hole 11b of the cylindrical body 11 is uniform over the entire surface. may be changed or the rubber thickness may be changed. Although not specifically shown, the diameter of the small hole of the cylindrical body gradually increases as it approaches both ends of the outer peripheral surface, and gradually decreases as it approaches the central position. It is configured such that the bulging amount in the outer diameter direction can be evenly adjusted corresponding to the hole diameter from the large number of small holes 11b(h) opened in (F).

According to the inner diameter machining diameter increasing and decreasing honing grindstone 27 provided with the cylindrical body 11 shown in FIG. 11, as in FIG. This is because the rubber pieces 14a uniformly bulge out of the large number of small holes 11b of the cylindrical body 11 to form a balloon grindstone whose diameter is increased by the coolant liquid CK produced by four types of pulsating or static pressures such as the pressure (P1+P2) P3 and the constant pressure P0. The honing/polishing of the inner diameter W1 of the workpiece W is smoothly and uniformly performed over the entire length of the inner diameter W1 with high precision by the rubber piece 14a which is uniformly swollen over the entire length of the cylindrical body.

The honing method of the inner diameter processing diameter increasing/decreasing honing grindstone by the grinding stone means of No. 1 and the grinding stone means of No. 2 is as follows. Coolant liquid CK with static pressure or pulsating pressure controlled by NC program PG is fed into the cylindrical body 4 from the grinding wheel mounting spindle S opened in the center through 1, and the diameter of the cylindrical body 4 is increased or decreased by the coolant liquid. The inner surface and inner diameter W1 of the material W are ground and honed.
In the above-described honing method, the grindstone mounting shaft portion 6 to which the cylindrical body 4 is fitted and the grindstone mounting spindle S having a center through 1 are connected by a universal joint (not shown) so as to be able to be centered. When the body 4 is inserted into the inner diameter W1 of the work material W, the pulsating pressure of the pressurized coolant liquid CK results in automatic alignment.

Thus, in the above honing method, the coolant supply device 50 is selected as a coolant liquid CK of static pressure or pulsating pressure controlled by the NC program PG from the NC control device 60, and the grindstone mounting spindle connected to the center through 1 is selected. It is possible to finely control the diameter increase and decrease of the cylindrical bodies 4 to 9 having various forms by selectively controlling the coolant liquid fed into the cylindrical body from S and having a wide variety of static pressure P0 and pulsating pressures P1, P2, and P3.
Thus, in the honing method using the inner diameter machining diameter increasing/decreasing honing grindstones 10 to 27, the grindstone mounting shaft portion 3 fitted with the cylindrical body and the grindstone mounting spindle S having the center through 1 opened are centered in a universal joint ( (not shown), and automatic alignment is possible by the pulsating pressure of the coolant liquid that is press-fitted after the cylindrical body is inserted into the inner diameter of the work material. can be implemented.

As described above, summarizing the inner diameter processing diameter increasing/decreasing diameter honing grinding wheels 10 to 27 of the present invention,
(1) First, according to the diameter increasing/decreasing honing grindstones 10 to 27 for inner diameter processing, the grindstone mounting spindle S is opened from the center through 1, and the small diameter portion and the large diameter portion are alternately connected to the tip of the grindstone mounting spindle. A cylindrical body with abrasive grains, which has a small hole connected to the center through in the small diameter part and fits in the grinding wheel mounting shaft 3, increases and decreases in diameter by controlling the coolant liquid sent into the cylindrical body and the static pressure and pulsation. , the function as a balloon grindstone is demonstrated, and grinding/honing to lapping can be performed on the inner diameter of the work material.
(2) In each of the inner diameter machining diameter increasing/decreasing diameter honing grindstones 10 to 27 of the present invention, the coolant liquid CK sent from the coolant supply device 50 is controlled by the NC program PG from the NC control device 60 at a static or pulsating pressure. The pressure P1 of the single cylinder AC, the pressure P2 of the single cylinder BC, the combined pressure (P1+P2) P3 of both, and the constant pressure P0. Since the coolant is sent into the , the diameter of various types of cylinders and thin rubber cylinders in the cylinders are increased or decreased by the hydraulic pressure of the coolant, and the grinding, honing, and polishing of the inner diameter W1 of the work material W is performed smoothly and delicately with high accuracy. be done.
(3) In each of the inner diameter processing diameter increasing/decreasing honing grindstones 10 to 27, the grindstone mounting shaft portion for fitting the cylindrical body and the grindstone mounting spindle having the center through are formed by a universal joint (not shown) so as to be able to be centered. The cylindrical body is automatically aligned by the pulsating pressure of the coolant fluid pressure CK that is press-fitted when the cylindrical body is inserted into the inner diameter W1 of the workpiece W. As shown in FIG. That is, when the pulsating coolant liquid CK is supplied into the cylindrical body and the diameter of the cylindrical body and the thin-walled rubber cylinder pulsates and increases and decreases, the automatic centering mechanism 70 works similarly as described with reference to FIG. Circular grinding, honing, and polishing are performed smoothly and delicately with high precision. Such actions and effects are exhibited.

The present invention is not limited to inner diameter grinding and polishing of a work material by each of the inner diameter processing increasing/decreasing diameter honing grindstones described above, but is applicable to a wide variety of other polishing apparatuses, and is applicable to a wide range of embodiments. Further, it is also possible to change the design of details constituting each diameter increasing/decreasing honing grindstone for inner diameter machining.

1 Center through 2a Small diameter portion 2b Large diameter portion 2c Small hole 3 Grindstone mounting shaft S Grindstone mounting spindle 4-11 Cylindrical body 4' Cylindrical body 4a Outer peripheral surface 4d, 4e Both ends 4b Inner wall surface 7a Sheet metal 7b Grooves 10-27 Internal diameter processing Diameter increasing/decreasing honing grindstone 13 Abrasive grain CK Coolant liquid 50 Coolant device 60 NC control device 70 Automatic centering mechanism PG NC control program AC Single cylinder BC Single cylinder P1 Pressure P2 Pressure (P1+P2) P3 Combined pressure of both P0 Constant pressure 11b Small hole h Small hole L Slit groove S Grindstone mounting spindle F Balloon W Work material W1 Inner diameter

Claims (2)

A grinding wheel mounting spindle having a center through, a grinding wheel mounting shaft having a small diameter portion and a large diameter portion alternately connected to the tip of the grinding wheel mounting spindle, and a small hole connecting to the center through in the small diameter portion extending in the outer diameter direction. A rubber cylindrical body is fitted to the grindstone mounting shaft with its inner wall surface fitted to the large-diameter portion of the grindstone mounting shaft, and abrasive grains are fixed to the outer periphery of the rubber cylindrical body. Furthermore, both ends of the rubber cylinder are airtightly enclosed and fixed to the grindstone mounting shaft with tapered screws so that the liquid does not leak from the grindstone mounting shaft. In the inner diameter processing diameter increasing/decreasing honing grindstone for increasing/decreasing the diameter of the rubber cylinder by controlling the pressure of the coolant liquid sent into the rubber cylinder ,
A plurality of chip pocket grooves are axially cut on the outer peripheral wall of the rubber cylinder, and a plurality of idling stopper protrusions are axially provided on the inner peripheral wall, and the protrusions are attached to the grindstone. A diameter increasing/decreasing honing grindstone for inner diameter processing, which is fitted to the large diameter portion of the shaft . 2. The grinding wheel for increasing/decreasing diameter for inner diameter processing according to claim 1, characterized in that the grinding wheel mounting shaft portion is formed such that a gap between a small diameter portion and a large diameter portion alternately connected to the tip of the grinding wheel mounting spindle is narrowed at a central position. Honing wheel for increasing/decreasing diameter for inner diameter processing.

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