JP2013013941A - Internal grooving method and groove cutting tool - Google Patents

Abstract

An object of the present invention is to prevent chips from fitting into an inner diameter groove when a plurality of inner diameter grooves are grooved into an inner peripheral surface in which protrusions are formed at equal intervals in the circumferential direction on the inner peripheral surface of the peripheral wall portion. To do.
A grooving tool (1) has a cutting edge portion (12) having a front cutting edge (13) having a width dimension coinciding with a groove width (W) of first and second snap ring grooves (105, 106), and smaller width than the front cutting edge (13). The first snap ring groove 105 is provided by the cutting blade portion 12 in a state in which the chip eliminating member 22 is maintained in a non-contact state with the clutch drum 100A which is a workpiece. Then, the chip removal portion 22 enters the first snap ring groove 105 in a non-contact state with the grooved first snap ring groove 105 while the cutting blade portion 12 makes a second snap ring. The groove 106 is grooved. Chips do not remain in the processed first snap ring groove 105 and second snap ring groove 106.
[Selection] Figure 4

Description

  The present invention relates to an inner diameter grooving method and a grooving tool, and more particularly to an inner peripheral surface of a member to be processed in which a projecting ridge extending in the axial direction is formed in an inner peripheral surface of a cylindrical peripheral wall portion. The present invention relates to an inner diameter grooving method and a grooving tool for grooving an inner diameter groove.

  For example, a clutch drum 100 used in an automatic transmission of an automobile includes a disc-shaped bottom wall portion 101 and a cylinder formed on the outer peripheral edge of the bottom wall portion 101 as shown in a partially broken explanatory view in FIG. A plurality of internal splines 103 extending inward in the radial direction and extending in the axial direction of the peripheral wall portion 102 are formed at equal intervals in the circumferential direction. . The internal spline 103 is formed to prevent a clutch plate (not shown) accommodated in the peripheral wall portion 102 from rotating relative to the clutch drum 100. A plurality of concave grooves into which the peaks 104 of the spline 103 are inserted are formed. A first snap ring groove 105 and a second snap ring groove 106 are formed in the circumferential direction on the inner peripheral surface of the opening end of the peripheral wall portion 102, and an annular snap ring (not shown) is attached to each of the snap ring grooves 105 and 106, respectively. Is done.

  For example, as disclosed in Patent Document 1, the clutch drum 100 configured as described above is formed by using a plate-shaped member formed by a cylindrical first mold having an internal spline molding portion on the outer periphery and a second mold. While sandwiching and rotating, the forming roller is pressed against the plate-like member to form the clutch drum main body 100A having the internal splines 103 on the inner periphery of the peripheral wall portion 102 as shown in FIG.

  Then, the first snap ring groove 105 and the second snap ring groove 106 having the same groove width are sequentially grooved on the inner peripheral surface of the clutch drum main body 100A by a lathe or the like to form the clutch drum 100 shown in FIG.

  When grooving each of the snap ring grooves 105, 106 with a grooving tool, as shown in FIG. 11, the front cutting edge 111a having the same width as the groove width W of each snap ring groove 105, 106 is formed. Since the crest 104 of each internal spline 103 is intermittently cut by the grooving tool 111 having, the chip 109 cut out by the front cutting edge 111a is the rake face 111b immediately after the front cutting edge 111a. A rectangular plate shape that is divided into a rectangular shape while curling the top and curved with a width equal to the groove width W of the first snap ring groove 105 and the second snap ring groove 106 as shown in a perspective view in FIG. It becomes the shape of chips.

  For this reason, the chips 109 that are generated and scattered when the grooving process is performed later may be fitted into the snap ring grooves 105 or 106 that have been processed first. For example, when the second snap ring groove 106 is grooved after the first snap ring groove 105 is grooved, the first snap ring groove 105 is grooved by the grooving tool 111. Even if the chip 109 generated by intermittently cutting the crest 104 of each internal spline 103 may enter the first snap ring groove 105 during grooving, The cutting edge 111 a is scraped off and discharged, and the chips 109 do not remain in the first snap ring groove 106.

  On the other hand, when the second snap ring groove 106 is grooved by the grooving tool 111 after the first snap ring groove 105 is grooved, the cutting generated along with the cutting of the crest 104 of each internal spline 103 is performed. The powder 109 may scatter and fit into the already processed first snap ring groove 105.

  The chip 109 fitted into the first snap ring groove 105 is a rectangular plate having the same width as the groove width W of the first snap ring groove 105, and is fitted and held in the first snap ring groove 105.

  Similarly, when the second snap ring groove 106 is processed first and the first snap ring groove 105 is grooved by the grooving tip 111, the chips 109 generated during the grooving of the first snap ring groove 105 are removed. There is a concern about fitting into the second snap ring groove 106.

  If the chips 109 inserted into the first snap ring groove 105, the second snap ring groove 106, etc. remain, the chips 109 cause a problem in quality of the clutch and the automatic transmission using the clutch. The first and second snap ring grooves 105 and 106 are processed, the individual clutch drums 100 are visually checked, and the chips 109 fitted in the snap ring grooves 105 and 106 are removed from the tool. Remove by etc.

JP 2005-103563 A

  The chip 109 inserted into the first snap ring groove 105 or the second snack ring groove 106 of the clutch drum 100 is equal to or substantially equal to the groove width W of the first snap ring groove 105 and the second snap ring groove 106. Since it has dimensions, it is in a state of being relatively firmly fitted into the first snap ring groove 105 and the second snap ring groove 106, and the visual check and removal work of the chips 109 is extremely troublesome and difficult for the operator. Put a burden. Further, the first snap ring groove 105, the second snap ring groove 106, and the internal spline 103 are used by a tool or the like when removing the chips 109 fitted in the first snap ring groove 105 or the second snap ring groove 106. There is a concern that careless damage will occur.

  The same problem is not limited to the clutch drum. Similarly, a plurality of internal spline-shaped ridges extending in the radial direction and extending in the axial direction on the inner peripheral surface of the cylindrical peripheral wall portion are formed in the circumferential direction. There is also a concern when grooving a plurality of annular inner diameter grooves on the inner peripheral surface of the processed member.

  Accordingly, an object of the present invention made in view of such a point is to provide an inner diameter groove on the inner peripheral surface of a member in which a protruding portion extending in the axial direction is formed in the circumferential direction on the inner peripheral surface of the cylindrical peripheral wall portion. An object of the present invention is to provide an inner diameter grooving method and a grooving tool that can prevent chips from fitting into an inner diameter groove when grooving.

  The invention of the inner diameter grooving method according to claim 1, the inner peripheral surface of the member to be processed in which a plurality of protrusions extending in the axial direction is formed on the inner peripheral surface of the cylindrical peripheral wall portion, In the inner diameter grooving method in which the first inner diameter groove and the second inner diameter groove are grooved by intermittently cutting the ridge portion of the ridge portion with a grooving tool, the grooving tool includes the first and second inner diameter grooves. A grooving member having a front cutting edge with a width dimension that matches the groove width of the first cutting edge, and a swarf eliminating member having a swarf removing part having a width smaller than that of the front cutting edge. The first inner diameter groove is grooved in a state in which the chip eliminating member maintains a non-contact state with the workpiece, and then the chip eliminating portion enters the first inner diameter groove that has been grooved. A second inner diameter grooving process is performed by a front cutting edge of the grooving member.

  According to this, the cutting edge part which has the front cutting edge of the width dimension which corresponds to the groove width of a 1st and 2nd internal diameter groove, and the chip removal member which has a chip | tip exclusion part narrower than a front cutting edge were provided. With the grooving tool, the first inner diameter groove is grooved by the cutting edge portion in a state in which the chip eliminator member is not in contact with the workpiece, and then the first erosion portion is grooved first. Since the second inner diameter groove is grooved by the cutting edge while entering the inner diameter groove, the chip removing member is not in contact with the workpiece when grooving the first inner diameter groove by the cutting edge. It is maintained and does not affect the grooving process of the first inner diameter groove by the cutting edge part. Further, when grooving the second inner diameter groove by the cutting edge part, the grooving of the second inner diameter groove is accompanied. Chips that have been scattered and entered into the first inner diameter groove that has been grooved are removed by the chip removal portion that enters the first inner diameter groove. It is removed by. As a result, no chips remain in the formed first inner diameter groove and second inner diameter groove and the like, and the visual check of the chips inserted in the troublesome first inner diameter groove and second inner diameter groove and the chips. The removal work is omitted or the removal work is remarkably reduced, so that the work burden on the worker is greatly reduced and the productivity is improved.

  The invention of a grooving tool according to claim 2 is the invention in which a plurality of protrusions extending in the axial direction are formed on the inner peripheral surface of the cylindrical peripheral wall portion at equal intervals in the circumferential direction. In a grooving tool that intermittently cuts the ridges of each of the protrusions on the peripheral surface to form the first inner diameter groove and the second inner diameter groove, the groove widths of the first and second inner diameter grooves A grooving member having a front cutting edge having a matching width dimension and a chip removing member having a chip removing portion having a width smaller than that of the front cutting blade, wherein the chip removing member is in a non-contact state with the workpiece. The first inner diameter groove is grooved by the grooving member in the maintained state, and the chip removing portion enters the first inner diameter groove which has been grooved, and the second inner diameter groove by the grooving member. Is characterized by grooving.

  According to this, the grooving tool has a cutting edge portion having a front cutting edge having a width dimension that matches the groove width of the first and second inner diameter grooves, and a chip having a chip removing portion having a width smaller than that of the front cutting edge. The first inner diameter groove is provided with an evacuation member, the first inner diameter groove is grooved by the cutting edge portion while the chip evacuation member maintains a non-contact state with the workpiece, and the swarf removal portion is grooved. By grooving the second inner diameter groove with the cutting edge portion while entering the groove, chips do not remain in the formed first inner diameter groove and second inner diameter groove.

  According to a third aspect of the present invention, in the grooving tool according to the second aspect of the present invention, the grooving tool includes a holder having a tip mounting portion formed at the tip, and the grooving member having the front cutting edge is fixed to the tip mounting portion. And having a distance from the center in the width direction of the front cutting edge to the center in the width direction of the chip removal portion that matches the distance between the centers in the width direction of the first inner diameter groove and the second inner diameter groove. The chip removal member is fixed to the chip mounting portion.

  According to this, the grooving chip | tip provided with the cutting edge part which has a front part cutting blade is fixed to the chip | tip attachment part formed in the front-end | tip of a holder, and between the center of each width direction of a 1st internal diameter groove and a 2nd internal diameter groove The grooving tool has a simple configuration in which the chip evacuation member is fixed to the chip mounting portion with a distance from the center in the width direction of the front cutting edge to the center in the width direction of the chip eliminator that matches the separation distance of Composed.

  According to a fourth aspect of the present invention, in the grooving tool according to the third aspect, the grooving member includes a fixed portion that is fixed to the tip mounting portion, and the front cutting portion that extends to the fixed portion. A grooving chip having a cutting edge portion having a blade, wherein the chip removing member includes a fixed portion fixed to the chip mounting portion, and the chip removing portion extended to the fixed portion. It is a dummy chip for cleaning.

  According to this, the grooving member is constituted by a grooving chip having a fixed portion fixed to the chip mounting portion of the holder and a cutting edge portion having a front cutting edge extended to the fixed portion, and a chip eliminating member Can be constituted by a dummy chip for cleaning provided with a fixed part fixed to the chip attaching part and a chip removing part extended to the fixed part.

  According to a fifth aspect of the present invention, in the grooving tool according to the third aspect, the grooving member includes a fixing portion fixed to the tip mounting portion, and the front cutting portion extended to the fixing portion. It is a grooving chip | tip provided with the cutting blade part which has a blade, The said chip removal member is a pin provided with the base fixed to the said chip | tip attachment part, and the said chip removal part, It is characterized by the above-mentioned.

  According to this, the grooving member is constituted by a grooving chip having a fixed portion fixed to the chip mounting portion of the holder and a cutting edge portion having a front cutting edge extended to the fixed portion, and a chip eliminating member Can be easily configured by a pin having a base fixed to the chip mounting portion and a chip removal portion.

  According to the present invention, the grooving tool has a cutting edge portion having a front cutting edge having a width dimension coinciding with the groove width of the first and second inner diameter grooves, and a cutting edge having a chip removing portion having a smaller width than the front cutting edge. A first exhaust groove is provided, the first inner diameter groove is grooved by the cutting edge portion in a state where the chip eliminator member is not in contact with the workpiece, and the swarf member is grooved first. Chips do not remain in the first inner diameter groove and the second inner diameter groove formed by grooving the second inner diameter groove with the cutting edge portion while entering the inner diameter groove.

It is explanatory drawing of the grooving tool concerning 1st Embodiment. It is the A section enlarged view of FIG. It is a perspective view of a grooving chip | tip. It is a perspective view of the dummy chip for cleaning. It is explanatory drawing of a 1st snap ring groove | channel and a 2nd snap ring groove | channel process. It is explanatory drawing of the grooving tool concerning 2nd Embodiment. It is explanatory drawing of a 1st snap ring groove | channel and a 2nd snap ring groove | channel process. It is explanatory drawing of a grooving tool. It is a partially broken explanatory view of a clutch drum. It is a partially broken explanatory view of a clutch drum body. It is explanatory drawing of the conventional grooving process. It is explanatory drawing of the conventional chip.

  Hereinafter, embodiments of an inner diameter grooving method and a grooving tool according to the present invention will be described by taking as an example the case of grooving a snap ring groove of a clutch drum.

(First embodiment)
The first embodiment will be described with reference to FIGS. 1 to 5, 9 and 10. FIG. FIG. 9 is a perspective view of the clutch drum 100, and FIG. 10 is a perspective view of a clutch drum main body 100A that is a member to be processed before a snap ring groove serving as an inner diameter groove is cut.

  A clutch drum main body 100A as a workpiece shown in FIG. 10 includes a disc-shaped bottom wall portion 101 and a cylindrical peripheral wall portion 102 formed on the outer peripheral edge of the bottom wall portion 101. A plurality of internal splines 103 that protrude inward in the radial direction on the inner peripheral surface of 102 and serve as ridges extending in the axial direction of the peripheral wall portion 102 are formed at equal intervals in the circumferential direction.

  The first snap ring groove 105 and the second snap ring groove 106 having a groove width W, which becomes an inner diameter groove, are grooved into the inner peripheral surface of the opening end portion of the peripheral wall portion 102 of the clutch drum main body 100A. A clutch drum 100 as shown is formed.

  1 to 4 are explanatory views of a grooving tool for grooving the first snap ring groove 105 and the second snap ring groove 106 in the clutch drum main body 100A. This grooving tool 1 has a grooving tip 10 as a grooving member in a tip mounting portion 3 formed at the tip of a rod-like holder 2 as shown in FIG. 1 as a whole and in FIG. And the cleaning dummy chip 20 used as a chip removal member is attached.

  As shown in a perspective view in FIG. 3, the grooving chip 10 has a substantially triangular plate shape, and includes a fixing portion 11 and three cutting blade portions 12 protruding from the fixing portion 11. The cutting edge portion 12 has a width dimension of the front cutting edge 13 at the front end that matches the groove width W of the first snap ring groove 105 and the second snap ring groove 106, and is gently curved to the rear of the front cutting edge 13. Side cutting edges 15 are formed along both sides of the continuously formed rake face 14.

  On the other hand, the cleaning dummy chip 20 is a substantially L-shaped plate-shaped fixing portion 21 having a mounting hole 21a and a pair of chip removal portions 22 protruding from the fixing portion 21 into a rectangular plate shape. Have The chip removal portion 22 is set to have a width smaller than the width of the front cutting edge 13 of the grooving chip 10, that is, smaller than the groove width W of the first snap ring groove 105 and the second snap ring groove 106 (W−α). A rake face 24 that is gently curved is formed behind the tip 23.

  On the other hand, the tip attachment portion 3 formed at the tip of the holder 2 has a tip attachment seat 4 orthogonal to the tip end of the holder 2 extending in the extending direction of the holder 2 and a center axis C perpendicular to the tip attachment seat 4. A flat clamp mounting seat 5 is formed in parallel. The grooving tip 10 is positioned on the tip mounting seat 4 with the fixing portion 11 abutting against the tip mounting seat 4 and the cutting edge portion 12 protruding from the tip mounting portion 3 and fixed to the clamp mounting seat 5 with the screw 7. The clamp piece 6 is fixed.

  On the other hand, the cleaning dummy chip 20 is positioned in a state where the fixing portion 21 overlaps with the clamp mounting seat 5 through a gap between the cleaning piece 20 and the chip removal portion 22 protrudes from the chip mounting portion 3. It is fixed to the clamp mounting seat 5 with a screw 8.

  By attaching the cleaning dummy chip 20 to the clamp mounting seat 5 with a gap between the clamp piece 6 and the cleaning dummy chip 20, the clamp piece 6 is attached to the holder 2 with the cleaning dummy chip 20 attached. The grooving tip 10 held by can be removed. Further, the cleaning dummy chip 20 can be detached from the chip mounting portion 3 in a state where the grooving chip 10 is mounted on the chip mounting portion 3. This facilitates maintenance work of the grooving chip 10 and the cleaning dummy chip 20.

  Thus, the cutting edge portion 12 of the grooving tip 10 attached to the tip attachment portion 3 and the chip removal portion 22 of the cleaning dummy tip 20 have a distance La between the centers in the width direction of the second snap ring groove. A distance Lb between the center in the width direction of 106 and the center in the width direction of the first snap ring groove 105 (La = Lb), and the distance from the center axis C of the holder 2 to the front cutting edge 13 of the cutting edge portion 12 A distance Ld between the central axis C and the tip 23 of the chip removal portion 122 is set slightly smaller than Lc (Lc> Ld). That is, the front cutting edge 13 slightly protrudes with respect to the tip 23 of the chip removal part 22.

  Then, the first snap ring groove 105 and the second snap ring that become the first inner diameter groove and the second inner diameter groove by the grooving chip 10 on the inner peripheral surface of the clutch drum main body 100A that is a workpiece to be rotationally driven by a lathe or the like. The groove 106 is sequentially grooved to form the clutch drum 100 shown in FIG.

  As shown in FIG. 5 (a), the first snap ring groove 105 is grooved by inserting the holder 2 from the opening end side of the clutch drum main body 100A and moving the cutting edge portion 12 of the grooving tip 10 to the first position. One snap ring groove 105 is opposed to a portion of the inner peripheral surface of the peripheral wall portion 102 to be processed. In this state, the chip removal portion 22 of the cleaning dummy chip 20 is located outside the opening end portion of the clutch drum main body 100A.

  Next, the holder 2 is advanced, and the first snap ring groove 105 having the groove width W is grooved by the cutting edge portion 12 of the grooved tip 10. This grooving process intermittently cuts the crest 104 of each internal spline 103 by the grooving tip 10 having the front cutting edge 13 having a width dimension matching the groove width W of the first snap ring 105, The chips cut by the front cutting edge 13 are divided into rectangular plates while curling on the rake face 14 immediately after the front cutting edge 13 with the same width W as the first snap ring groove 105. As the first snap ring groove 105 is grooved by the advancing grooving chip 10, the chip removal part 22 of the cleaning dummy chip 20 is located outside the opening of the clutch drum main body 100A as shown in FIG. As a result, the chip removal portion 22 is maintained in a non-contact state with the clutch drum main body 100A and does not affect the grooving of the first snap ring groove 105 by the grooving tip 10.

  When the grooving processing of the first snap ring groove 105 by the forward movement of the grooving chip 10 is completed, the grooving chip 10 is retracted and extracted from the first snap ring groove 105, and as shown in FIG. And the cutting edge portion 12 of the chip 10 is opposed to a portion of the inner peripheral surface of the peripheral wall portion 102 where the second snap ring groove 106 is to be processed. In this state, the chip removal portion 22 of the cleaning dummy chip 20 faces the processed first snap ring groove 105.

  Next, the holder 2 is advanced, and the second snap ring groove 106 is grooved by the cutting edge portion 12 of the grooved tip 10. This grooving process is performed by intermittently cutting the crests 104 of each internal spline 103 by the grooving tip 10 having the front cutting edge 13 whose width dimension matches the groove width W of the second snap ring 106. The chips cut by the front cutting edge 13 are divided into rectangular plates while curling on the rake face 14 immediately after the front cutting edge 13 with the same width W as the first snap ring groove 105. On the other hand, as shown in FIG. 5 (d), the chip removal formed with the groove width W of the first snap ring groove 105 due to the groove insertion of the second snap ring groove 106 by the grooving chip 10 moving forward. The portion 22 enters the vicinity of the bottom portion 105b of the first snap ring groove 105 in a non-contact state without contacting the side surface 105a of the first snap ring groove 105. When the second snap ring groove 106 is grooved by the tip 23 of the chip removal portion 22 that has entered to the vicinity of the bottom 105 b of the first snap ring groove 105, the second snap ring groove 106 is generated and scattered in the first snap ring groove 105. Incoming chips are removed.

  Even if chips generated by the second snap ring groove 106 enter the first snap ring groove 105 during the grooving process of the second snap ring groove 106, the chips are removed by the chip removing unit 22. It will be eliminated in advance.

  As a result, chips do not remain in the first snap ring groove 105 and the second snap ring groove 106 of the molded clutch drum 100, and the troublesome first snap ring groove 105 and second snap ring groove 106 are formed. The visual check of the inserted chips and the removal work of the chips are omitted or the removal work is greatly reduced, the work burden on the operator is greatly reduced, and the productivity is improved. Further, the first snap ring groove 105, the second snap ring groove 106, the internal spline 103 and the like are not damaged by a tool or the like accompanying the removal of chips, and the product quality can be improved.

(Second Embodiment)
A second embodiment will be described with reference to FIGS. In the present embodiment, the chip removing member is configured by the pin 30 instead of the cleaning dummy chip 20 in the first embodiment, and other configurations are the same as those in the first embodiment. The same reference numerals are given to the parts to be described, and detailed description thereof will be omitted.

  FIG. 6 shows an outline of the tip of the holder 2, and the grooving tip 10 and the pin 30 are attached to the tip attachment portion 3 formed at the tip of the rod-shaped holder 2. As in the first embodiment, the grooving tip 10 is positioned and clamped on the tip mounting seat 4 with the fixing portion 11 abutting on the tip mounting seat 4 and the cutting edge portion 12 protruding from the tip mounting portion 3. The seat 5 is fixed by a clamp piece 6 fixed by a screw 7.

  On the other hand, the pin 30 has a base 31 that is formed in a columnar shape and is inserted into an attachment hole 3 a formed in the chip attachment portion 3, and a chip removal portion 32 that protrudes from the attachment hole 3 a. The chip removal portion 32 is formed with a smaller diameter than the width of the front cutting edge 13 of the grooving chip 10. That is, the chip removal portion 32 is set to have a smaller diameter than the groove width W of the first snap ring groove 105.

  In this way, the cutting edge portion 12 of the grooving tip 10 and the chip removal portion 32 of the pin 30 attached to the tip attachment portion 3 have a distance between the centers thereof and the width direction center of the second snap ring groove 106. 1 The distance from the center of the snap ring groove 105 in the width direction is set, and the tip 33 of the chip removal portion 32 from the center axis with respect to the distance from the center axis of the holder 2 to the front cutting edge 13 of the cutting edge portion 12. The distance between them is set slightly smaller.

  Then, the first snap ring groove 105 and the second snap ring that become the first inner diameter groove and the second inner diameter groove by the grooving chip 10 on the inner peripheral surface of the clutch drum main body 100A that is a workpiece to be rotationally driven by a lathe or the like. The groove 106 is sequentially grooved to form the clutch drum 100 shown in FIG.

  The first snap ring groove 105 is grooved by inserting the holder 2 from the opening end side of the clutch drum main body 100A as shown in FIG. The snap ring groove 105 faces the inner peripheral surface of the peripheral wall portion 102 to be processed. In this state, the chip removal portion 32 of the pin 30 is located outside the opening end portion of the clutch drum main body 100A.

  Next, the holder 2 is advanced, and the first snap ring groove 105 is grooved by the cutting edge portion 12 of the grooving tip 10. As the first snap ring groove 105 is grooved by the advancing grooving tip 10, the chip removal portion 32 of the pin 30 moves forward outside the opening of the clutch drum main body 100A as shown in FIG. 7B. As a result, the chip removal portion 32 is kept in a non-contact state with respect to the clutch drum main body 100 </ b> A and does not affect the grooving process of the first snap ring groove 105 by the grooving tip 10.

  When the grooving processing of the first snap ring groove 105 by the forward movement of the grooving tip 10 is completed, the grooving tip 10 is retracted and extracted from the first snap ring groove 105, and as shown in FIG. And the cutting edge portion 12 of the grooving tip 10 is opposed to a portion of the inner peripheral surface of the peripheral wall portion 102 where the second snap ring groove 106 is to be processed. In this state, the chip removal portion 22 of the pin 30 faces the central portion of the groove width W of the processed first snap ring groove 105.

  Next, the holder 2 is advanced, and the second snap ring groove 106 is grooved by the cutting edge portion 12 of the grooving tip 10. This grooving process is performed by intermittently cutting the crest 104 of each internal spline 103 by the grooving tip 10 having the front cutting edge 13 whose width dimension matches the groove width W of the second snap ring 106. The chips cut by the front cutting edge 13 are divided into rectangular plates while curling on the rake face 14 immediately after the front cutting edge 13 with the same width W as the first snap ring groove 105. On the other hand, as shown in FIG. 7 (d), the chip removal portion formed with a smaller diameter than the groove width W of the first snap ring groove 105 with the groove insertion of the second snap ring groove 106 by the grooving chip 10 moving forward. 32 enters the vicinity of the bottom 105b in a non-contact state without contacting the side surface 105a of the first snap ring groove 105. The tip 33 of the chip removal portion 32 that has entered the vicinity of the bottom portion 105 b of the first snap ring groove 105 is generated and scattered during the grooving process of the second snap ring groove 106, and enters the first snap ring groove 105. Intruded chips are removed.

  As described above, even if the chips generated by the second snap ring groove 106 enter the first snap ring groove 105 during the grooving process of the second snap ring groove 106, the chips are the chips of the pin 30. Excluded by the exclusion unit 32.

  In this embodiment, the base 31 of the pin 30 is inserted into the mounting hole 3a formed in the chip mounting portion 3 and the pin 30 is fixed to the chip mounting portion 3. However, although detailed description is omitted, The pin 30 can also be formed integrally with the chip mounting part 3 as shown in FIG.

  Note that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the invention. For example, in the above-described embodiment, the grooving chip is described as an example of the tool, but the present invention is not limited to the grooving chip but can be applied to other tools such as a grooving tool. Furthermore, not only the clutch drum but also an inner diameter groove on the inner peripheral surface of the member to be processed, in which protrusions extending in the axial direction are formed at equal intervals in the inner peripheral surface of another cylindrical peripheral wall portion. It can be applied when grooving.

DESCRIPTION OF SYMBOLS 1 Grooving tool 2 Holder 3 Tip attachment part 6 Crank piece 10 Groove insert (grooving member)
DESCRIPTION OF SYMBOLS 11 Fixed part 12 Cutting edge part 13 Front cutting edge 20 Dummy tip for cleaning (chip removal member)
21 Fixing part 21a Mounting hole 22 Chip removal part 23 Tip 30 Pin (chip removal member)
31 Base 32 Chip Exclusion 33 33 Tip 100 Clutch Drum 100A Clutch Drum Body (Workpiece)
102 peripheral wall 103 internal spline (protruding part)
105 First snap ring groove (inner diameter groove)
106 Second snap ring groove (inner diameter groove)

Claims (5)

On the inner peripheral surface of the member to be processed in which a plurality of projecting ridges extending in the axial direction are formed on the inner peripheral surface of the cylindrical peripheral wall portion, the ridges of the respective ridge portions are intermittently cut with a grooving tool. In the inner diameter groove machining method of cutting and grooving the first inner diameter groove and the second inner diameter groove,
The grooving tool has a grooving member having a front cutting edge with a width dimension matching the groove width of the first and second inner diameter grooves, and a chip evacuation member having a chip evacuation portion having a width smaller than the front cutting edge. With
The first inner diameter groove is grooved in a state where the chip eliminating member maintains a non-contact state with the workpiece by the front cutting edge of the grooving member,
Next, the inner diameter grooving method is characterized in that the chip evacuation member performs a second inner diameter grooving process with a front cutting edge of the grooving member while entering the first inner diameter groove that has been grooved. On the inner peripheral surface of the member to be processed, in which a plurality of projecting ridges extending in the axial direction are formed on the inner peripheral surface of the cylindrical peripheral wall portion, the ridges of each of the ridge portions are intermittently cut. In a grooving tool for grooving 1 inner diameter groove and second inner diameter groove,
A grooving member having a front cutting edge having a width dimension matching the groove width of the first and second inner diameter grooves, and a chip removing member having a chip removing portion having a smaller width than the front cutting edge,
The first inner diameter groove is grooved by the grooving member in a state in which the chip eliminating member is kept in non-contact with the workpiece, and the chip inner member has been grooved. A grooving tool for grooving the second inner diameter groove by the grooving member while entering the groove. Provided with a holder with a tip mounting portion formed at the tip,
A grooving member having the front cutting edge is fixed to the tip mounting portion,
The cutting edge has a distance from the center in the width direction of the front cutting edge to the center in the width direction of the chip removal portion that matches the separation distance between the centers in the width direction of the first inner diameter groove and the second inner diameter groove. The grooving tool according to claim 2, wherein a powder removing member is fixed to the chip mounting portion. The grooving member is
A grooving chip comprising a fixed part fixed to the chip mounting part, and a cutting edge part having the front cutting edge extended to the fixed part,
The chip eliminating member is
The grooving tool according to claim 3, wherein the grooving tool is a cleaning dummy chip including a fixing portion fixed to the tip mounting portion and the chip removal portion extending to the fixing portion. The grooving member is
A grooving chip comprising a fixed part fixed to the chip mounting part, and a cutting edge part having the front cutting edge extended to the fixed part,
The chip eliminating member is
4. The grooving tool according to claim 3, wherein the grooving tool is a pin provided with a base fixed to the chip mounting portion and the chip removal portion.

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