JP6068924B2 - Chip removal device - Google Patents

Description

  The present invention relates to a device for removing chips generated when an end portion of a pipe material such as a steel pipe is processed.

  A propeller shaft (propulsion shaft) for an automobile transmits power generated by a prime mover to a rear wheel, and includes two or more universal joints and a steel pipe. The yoke constituting the universal joint is provided with a cylindrical projection for abutting with a steel pipe and joining by friction welding. Steel pipes are joined by friction welding after being cut to a specified length, but if the lengths of the cut steel pipes vary, the amount melted by the friction welding machine becomes unstable, which increases the reliability of the joint. In addition to being easily affected, the overall length of the propulsion shaft is likely to vary. For this reason, the end of the steel pipe is usually cut at the propulsion shaft in order to accurately obtain the entire length after cutting the steel pipe.

  When the end portion of the steel pipe is cut, chips enter the inside of the steel pipe. If this is not removed, noise may be generated from the steel pipe while the vehicle is running after the propulsion shaft is completed. Moreover, if the burrs generated during the cutting process are applied to the friction welding while adhering to the end face, the burrs may be taken in a ring shape and wound around the steel pipe, or the burrs may melt and remain in an indeterminate shape. Therefore, it is required to reliably remove chips and burrs after cutting the end face of the steel pipe.

  For a general cut product, the chips can be easily removed by spraying compressed air, for example. However, with respect to the chips that have entered the inside of the steel pipe, it is difficult to remove the chips because they are pushed further into the interior by simply spraying compressed air. When both ends of the steel pipe are open and both ends communicate with each other, a method of discharging the chips from the other end by blowing air from one end may be considered. In some cases, a structure such as a dynamic damper is inserted to block the air flow, and in this case, the method cannot be used. Therefore, conventionally, the removal of chips inside the steel pipe is often performed manually, especially when the diameter of the periphery of the end of the steel pipe of the propulsion shaft is reduced and the hand does not enter the steel pipe. It has been a laborious operation of inserting inside and removing chips by operating the handle of the brush outside the steel pipe.

  A technique described in Patent Document 1 can be cited as a technique for dealing with the above problems. The technique of patent document 1 inserts the doughnut-shaped expansion body similar to a rubber tire tube inside the steel pipe, pressurizes the inside of this expansion body, and adheres the expansion body to the inner surface of the steel pipe. The passage to the back is blocked by the expansion body to prevent infiltration of chips.

JP 2003-136361 A

  However, in the technique of Patent Document 1, an expanding body is inserted before cutting, pressurized to be in close contact with the inner surface of the steel pipe, and after processing, air is released from the expanding body to release the close contact state. There is a problem that the number of work steps is increased.

  This invention was created in order to solve such a subject, The objective is providing the apparatus which can remove the chip | tip inside the to-be-cut members, such as a steel pipe, without increasing work man-hours. It is in.

In order to solve the above-mentioned problem, the present invention is a device for removing chips generated when one end edge of a cylindrical member to be cut is cut by a cutting device, and the inside of the member to be cut from the opening on the one end edge side. And an air injection tube for injecting air from the air injection hole, and a recess that is inserted into the member to be cut from the opening and directed toward the opening, and the air injected from the air injection hole An air receiving member that flows toward the opening along the inner surface of the recess, and the inner diameter of the recess near the edge on the outer peripheral side is directed toward the opening on the one end edge of the member to be cut. Accordingly, the diameter of the air injection pipe is extended to the inside of the recess, the air injection hole is disposed inside the recess, and the axial direction of the hole is the outer periphery of the recess. The air injection to direct the side edge Characterized in that it is perforated in the peripheral wall.

  According to this chip removing device, the chips generated at the cutting portion of the one end edge are blown away from the opening portion by being sprayed to the one end edge from the inside of the member to be cut. Intrusion into the cutting member is prevented.

  According to this chip removal device, since the edge portion of the recess of the air receiving member has a shape with an enlarged diameter, the direction of the air when leaving the edge is a directional component along the axis of the member to be cut And a radially outward component. When a predetermined gap is formed between the inner peripheral surface of the member to be cut and the air receiving member, a negative pressure is effectively generated in the gap due to the momentum of the air flow. Therefore, even if some of the chips suddenly enter the part to be cut and wrap around behind the air receiving member, they are gradually sucked into the gap by the negative pressure, The air flowing from the edge of the recess toward the one end edge of the member to be cut is removed to the outside.

  According to this chip removing device, air can be effectively blown around one end edge of the member to be cut without causing unnecessary turbulent air flow in the recess.

Further, in the present invention, in the configuration in which the cutting device cuts one end edge of a member to be cut that rotates about an axis with the fixed cutting blade, the air injection holes are perforated by the same number as the number of the fixed cutting blades. is, and being located such that the axis the fixed cutting blade in the direction of rotation and phase match.

  According to this chip removing device, air can be effectively blown toward the fixed cutting blade, that is, toward the cutting portion at one end edge of the member to be cut.

  Further, the present invention is characterized in that the air receiving member is fixed to a table of the cutting apparatus for attaching the fixed cutting blade via a bracket.

  According to this chip removal device, the air receiving member can be attached to the cutting device with a compact and simple structure.

According to the present invention, the following effects are exhibited.
(1) It becomes possible to remove chips simultaneously with the cutting of the member to be cut, and there is no need to provide a separate chip removal step. Thereby, the processing time of the member to be cut can be shortened.
(2) Conventionally, the presence or absence of chips has been confirmed by visual observation. However, according to the present invention, since the remaining chips are eliminated, the visual confirmation work is also unnecessary.
(3) The chips are blown away at a certain place, and the scattering range of the chips around the processing equipment is kept small.

It is a side view of a cutting device and the chip removal apparatus which concerns on this invention. It is a principal part enlarged view of FIG. It is AA sectional drawing in FIG. It is operation | movement explanatory drawing of the chip removal apparatus which concerns on this invention. (A)-(c) is a side view which shows the modification of the chip removal apparatus which concerns on this invention, respectively.

  In FIG. 1, a cutting device 11 is a device that cuts one end edge Wa of a cylindrical workpiece W that is horizontally laid down. The workpiece W is, for example, an automobile propeller shaft. The cutting device 11 includes a slider 12 that is slidable along the axis O of the member W to be cut with respect to a device base (not shown), a base member 13 that is placed and fixed on the slider 12, and a base member 13. A disc-like table 14 attached to one side surface (side surface facing the opening Wb on the one end edge Wa side of the member W to be cut) around the axis O, and a side surface of the table 14 (on the opening Wb) And upper and lower fixed cutting blades 15 and 16 attached to opposing side surfaces 14b. The workpiece W is rotated around the axis O by a rotating means (not shown), and the one end edge Wa is cut by the fixed cutting blades 15 and 16.

  The chip removing device 1 according to the present invention prevents chips generated when one end edge Wa of the workpiece W is cut from entering the inside of the workpiece W, and a part of the chips. Even if it suddenly enters the inside of the workpiece W, it has a function of removing it from the opening Wb to the outside.

  The chip removing device 1 is inserted into the member to be cut W from the opening Wb of the member to be cut W, and the air injection pipe 2 for injecting air from the air injection hole 4 and the member W to be cut from the opening Wb. An air receiving member 3 that is inserted inside and has a recess 5 toward the opening Wb, and that causes the air injected from the air injection hole 4 to flow along the inner surface of the recess 5 toward the opening Wb. Configured.

"Air injection pipe 2"
Through holes 13 a and 14 a are formed in the base member 13 and the table 14 around the axis O, respectively. The air injection pipe 2 is piped so as to pass through the through holes 13 a and 14 a, and the distal end side of the table 14 It protrudes from the side surface 14b. That is, the air jet tube 2 having a linear shape is arranged coaxially with the workpiece W. The base end side of the air injection pipe 2 is connected to a compressor (not shown). The air injection tube 2 is made of a metal tube, a resin tube, or the like.

  As shown in an enlarged view in FIG. 2, the air injection hole 4 is drilled in the peripheral wall of the air injection pipe 2 so that the hole axial direction P is generally directed to the edge 6 of the recess 5 of the air receiving member 3. . The air injection tube 2 has a specification that the peripheral wall has a relatively thick wall thickness, and the air injection holes 4 are formed in an inclined manner with respect to the wall thickness, so that the air injection flow is generated by the air injection holes. 4 and the air injection direction coincides with the hole axial direction P.

  In this embodiment, since the cutting device 11 has the two fixed cutting blades 15 and 16, the two air injection holes 4 are formed so as to correspond to each cutting blade. As shown in FIG. 3, the air injection hole 4 located above is positioned so that the phase thereof coincides with the upper fixed cutting blade 15 in the direction around the axis O, and the air injection hole 4 located below is also In the direction around the axis O, it is positioned so as to be in phase with the lower fixed cutting blade 16. Thereby, the air from the air injection hole 4 is effectively injected toward the fixed cutting blades 15 and 16 where the chips are generated. In addition, regarding the wording “phase is coincident”, the position of the fixed cutting blades 15 and 16 cannot be defined as a point due to the relationship of the blade shape. Therefore, in the present invention, as shown in FIG. In view, if the hole axial direction P of the air injection hole 4 is located within the range of the occupation angle θ of the fixed cutting blades 15 and 16 in the direction around the axis O, the phase is assumed to be in agreement.

"Air receiving member 3"
The air receiving member 3 is required to have a shape that can effectively guide the air jetted from the air jet pipe 2 around one end edge Wa of the member to be cut W, which is a place where chips are generated. The air receiving member 3 is made of metal or resin. As shown in FIG. 2, the air receiving member 3 has a frustoconical shape that increases in diameter toward the opening Wb of the member W to be cut, and is arranged around the axis O. . That is, the air receiving member 3 is disposed coaxially with the member to be cut W. The shape of the inner surface of the recess 5 is generally similar to the outer shape, and the bottom side (the side away from the opening Wb) of the recess 5 forms a flat surface or a gentle arc shape and then moves toward the opening Wb. Accordingly, the diameter is increased. A gap S is formed between the edge portion 6 that is the maximum outer diameter portion of the air receiving member 3 and the inner peripheral surface of the member W to be cut. The dimension of the gap S is, for example, a dimension that allows chips to pass through.

  As an example of the mounting structure of the air receiving member 3, a bracket 17 extending along the axis O is provided, and the base end side thereof is fastened and fixed to the side surface 14 b of the table 14 by a bolt 18, and the tip end side thereof is air. It is set as the attachment part of the receiving member 3. FIG. For example, the inner surface of the recess 5 of the air receiving member 3 is fixed to the tip of the bracket 17 by welding or the like. The bracket 17 deviates from the hole axial direction P of the air injection hole 4 as viewed in the axial direction of the axis O as shown in FIG. 3 so as not to affect the flow of air injected from the air injection hole 4. Located in place. In addition, the attachment structure of the air receiving member 3 is not restricted to this, For example, the inner surface of the air receiving member 3 can also be attached to the periphery of the front-end | tip of the air injection pipe 2 via a bracket or directly.

"Operation of chip removal device 1"
FIG. 4A shows a state before the start of cutting, and shows a state in which the member to be cut W is set apart from the cutting device 11. A structure such as a dynamic damper (not shown) is housed inside the workpiece W, and the opening Wb on the one end Wa side and the opening on the other end are not in internal communication. The chip removing device 1 is attached to the cutting device 11.

  From the state of FIG. 4A, the slider 12 slides along the axis O toward the member W to be cut, and the tip end side of the air injection pipe 2 of the chip removal device 1 and the air receiving member 3 are at one end edge Wa. It will be in the state inserted in the to-be-cut member W from the opening part Wb of the side, and one end edge Wa will be abutted against the fixed cutting blades 15 and 16 (state of FIG.4 (b)). Before and after this, the member W to be cut is rotated around the axis O by a rotating means (not shown), and compressed air is supplied to the air injection pipe 2 by the operation of a compressor (not shown). Cutting of one end edge Wa of the member W is started.

  Air supplied to the air injection pipe 2 is injected from the air injection hole 4. The jetted air flows along the inner surface of the concave portion 5 of the air receiving member 3 formed so as to expand in diameter toward the opening Wb, thereby toward the opening Wb and outward in the radial direction of the axis O. And is sprayed onto the cutting portion of the one end edge Wa of the member W to be cut.

  As shown in FIG. 4C, the chips generated at the cutting portion of the one end edge Wa are blown to the outside of the opening Wb by being sprayed from the inner side of the workpiece W to the one end edge Wa. Intrusion of chips into the workpiece W is prevented. Further, a negative pressure is generated in the gap S between the air receiving member 3 and the inner peripheral surface of the member to be cut W by the momentum of the air flowing from the edge 6 of the recess 5 toward the one end edge Wa of the member to be cut W. Therefore, even if a part of the chips suddenly enters the workpiece W and wraps behind the air receiving member 3, it gradually sucks up to the gap S due to the negative pressure. After that, it is removed to the outside by the air flowing from the edge 6 of the recess 5 toward the one end edge Wa of the member W to be cut.

  In particular, as shown in FIG. 2, if the air injection hole 4 is configured to be perforated in the peripheral wall of the tube so that the hole axial direction P is directed to the edge 6 of the recess 5 of the air receiving member 3, Therefore, the chips can be removed by effectively blowing air around the one end edge Wa of the member W to be cut without causing unnecessary air turbulence. Further, by positioning the air injection hole 4 so that the phase thereof coincides with the fixed cutting blades 15 and 16 in the direction around the axis O, air is directed toward the fixed cutting blades 15 and 16, that is, at one end edge Wa. It can be sprayed effectively toward the cutting site.

"First modification"
The 1st modification shown to Fig.5 (a) shows the case where the outer shape of the air receiving member 3 is made into the bottomed cylindrical shape. Accordingly, the recess 5 is formed as a cylindrical space. A gap is formed between the inner peripheral surface of the cutting member W and the outer peripheral surface of the air receiving member 3 as in the case of FIG. Moreover, in the air injection pipe 2, the position of the air injection hole 4 is perforated not at the peripheral wall of the pipe but at one point. Other configurations of the chip removing device 1 and the cutting device 11 are the same as those shown in FIG.

  Also in the first modification, the air injected from the air injection hole 4 flows along the inner surface of the recess 5 of the air receiving member 3 and is blown to the opening Wb of the member W to be cut. However, in the air receiving member 3 shown in FIG. 1 and FIGS. 5B and 5C to be described later, the diameter of the air receiving member 3 increases as it goes toward the opening Wb. The air direction has both a directional component along the axial center O and a radially outward component, and negative pressure in the gap S (FIG. 2) can be effectively generated. Since the direction of air when moving away from the portion 6 is substantially only a directional component along the axis O, the negative pressure in the gap tends to be smaller than that of others. However, by taking measures such as setting the gap to be small, a sufficient chip removal effect can be expected even in the first modification.

"Second modification"
In the second modification shown in FIG. 5B, the outer shape of the air receiving member 3 is a cylindrical shape on the bottom side (side away from the opening Wb), and toward the opening Wb near the edge 6. Therefore, the case where it is set as the cone shape which expands in diameter is shown. In other words, in FIG. 1, the inner diameter of the concave portion 5 is formed so as to increase toward the opening Wb over substantially the entire range from the bottom portion to the edge portion 6, whereas in the second modified example, the concave portion 5 is formed. An example is shown in which the inner diameter of at least the edge 6 is formed so as to increase in diameter toward the opening Wb. Other configurations of the chip removing device 1 and the cutting device 11 are the same as those shown in FIG.

  As in the case of FIG. 1, as in the case of FIG. 1, if the inner diameter at least near the edge 6 is formed so as to increase in diameter toward the opening Wb regardless of the shape on the bottom side, the edge 6 The direction of the air when moving away from the center has both a directional component along the axis O and a radially outward component. Therefore, the negative pressure in the gap S (FIG. 2) can be effectively generated, and the chip removal efficiency substantially equivalent to that of the embodiment of FIG. 1 can be obtained.

“Third Modification”
The 3rd modification shown in Drawing 5 (c) shows the case where air receiving member 3 is formed in the shape of a curved surface. This third modified example is also one example in which the inner diameter of the recess 5 is formed so as to increase in diameter toward the opening Wb. Other configurations of the chip removing device 1 and the cutting device 11 are the same as those shown in FIG. Also according to the third modification, the air is blown from the inner side of the workpiece W to the one end edge Wa, whereby the chips are effectively removed.

  The preferred embodiment of the chip removing device 1 has been described above, but the shape of the air receiving member 3 and the number and position of the air injection holes 4 of the air injection pipe 2 are not limited to those described in the drawings. It can be implemented. For example, the shape of the air receiving member 3 may be formed so that the outer shape is a columnar shape and the concave portion 5 becomes a conical space whose diameter increases as it goes to the opening Wb. The recess 5 may be locally formed so that air can be effectively guided to the fixed cutting blades 15 and 16 instead of being formed in the air receiving member 3 around the entire circumference of the axis O, for example. In addition, the cutting device 11 may have a structure in which a cutting blade rotates.

DESCRIPTION OF SYMBOLS 1 Chip removal apparatus 2 Air injection pipe 3 Air receiving member 4 Air injection hole 5 Recessed part 6 (Recessed part) Edge part 11 Cutting device 15,16 Fixed cutting blade 17 Bracket P Hole axial direction S Crevice W Workpiece member Wa End edge Wb opening

Claims (3)

A device for removing chips generated when one end edge of a cylindrical workpiece is cut by a cutting device,
An air injection pipe that is inserted into the member to be cut from the opening on the one end edge side and injects air from an air injection hole;
Air that is inserted into the member to be cut from the opening, has a recess toward the opening, and flows the air injected from the air injection hole toward the opening along the inner surface of the recess. A receiving member;
Equipped with a,
The inner diameter near the edge on the outer peripheral side of the recess is formed so as to increase in diameter toward the opening on the one end edge of the member to be cut,
The periphery of the tip of the air injection pipe extends to the inside of the recess,
The air injection hole is disposed inside the recess, and is cut in the peripheral wall of the air injection tube so that the hole axial direction is directed to the edge on the outer peripheral side of the recess. Powder removal device. In the configuration in which the cutting device cuts one end edge of a member to be cut that rotates around an axis by the fixed cutting blade,
The air injection holes, the drilled same number as the number of the fixed cutting blade, according to claim 1, characterized in that the axis the fixed cutting blade in the direction of rotation and phase are positioned to coincide Chip removal equipment. The chip removal device according to claim 2 , wherein the air receiving member is fixed to a table of the cutting device for mounting the fixed cutting blade via a bracket.

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