JP2009078284A - Method for manufacturing spline member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a spline member capable of improving productivity dispensing with a deburring process. <P>SOLUTION: The manufacturing method for spline member 1 includes: a boss-forming process, in which plastic-working for plastically deforming a blank is performed and a cylindrical boss part 2 is formed by extending the tip end face 21 under free-state without restricting it; a spline basic point plane forming process, in which the spline basic point plane 22 obtained by adjusting the distance from the basic plate part 11 into a prescribed distance, is formed by pushing the inner circumferential side portion in the tip end part 21 of the boss part 2 in an axial direction; a spline forming process, in which the spline part 3 is formed along the axial direction from the spline basic point plane 22 on the inner circumferential plane 201 of the boss part 2; and a cutting-off process, in which the unnecessary parts at the tip end side of the spline forming region 30 in the boss part 2 is cut off so as not to cut off the spline forming region 30 of the boss part 2. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a spline member formed by forming a spline portion on a cylindrical boss portion.

For example, a spline member in which a spline part is formed on a cylindrical boss part is frequently used for automobile parts or the like (see Patent Document 1).
Such a spline member usually forms a cylindrical boss portion by burring or the like on a plate-shaped material provided with a through hole, and forms a spline portion along the axial direction from the tip surface of the boss portion. Manufactured by.

JP 2004-34037 A

  In the conventional manufacturing method, when the boss portion is formed by burring or the like, the tip surface of the boss portion is formed in a free state without restraining the boss portion, so the shape of the tip surface of the boss portion becomes non-uniform. Therefore, after forming a spline part in the boss part, in order to adjust the shape of the tip surface of the boss part, the cutting process which cuts the tip surface of the boss part was performed.

  However, if the spline part is formed from the tip surface of the boss part having a non-uniform shape, the starting point of the spline part also varies. Therefore, in the cutting process, when cutting the tip surface of the boss part, it is necessary to cut the axial end face of the spline part as a new starting point in order to align the starting point of the spline part with a desired position. . If the axial end face of this spline part is cut, burrs will occur. Therefore, a deburring step for deburring is required, resulting in a decrease in productivity.

  The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a method for manufacturing a spline member that does not require a deburring step and can improve productivity.

The present invention performs a plastic working that plastically deforms a material, and forms a cylindrical boss portion that is stretched in a free state without constraining the tip surface; and
A spline base surface that forms a spline base surface at a position corresponding to the axial end surface position of the spline portion to be formed by pressing the inner peripheral portion or the outer peripheral portion of the tip surface of the boss portion in the axial direction. Forming process;
Spline portions are formed on the inner peripheral surface or outer peripheral surface of the boss portion by alternately providing peaks formed along the axial direction from the spline base surface and valleys formed between the peaks. Spline forming process;
The spline member manufacturing method includes a cutting step of cutting an unnecessary portion on the tip side of the boss portion with respect to the spline formation region so as not to cut the spline formation region of the boss portion. Item 1).

  In the method for manufacturing a spline member of the present invention, the spline base surface forming step is performed before the spline forming step. That is, before the spline portion is formed on the boss portion, the spline base point surface serving as a base point for forming the spline portion is provided in advance on the distal end surface of the boss portion. Then, in the spline forming step, the spline part is formed so that the spline base point face is directly used as the axial end face of the spline part with the spline base point face of the boss part as a base point.

  Therefore, the starting point of the spline part to be formed can be aligned with the spline base point surface that is the axial end surface of the spline part. Thereby, in the subsequent cutting step, when cutting the front end surface of the free-form boss portion, the front end side of the spline base surface which is the axial end surface of the spline portion, that is, the spline formation region. What is necessary is just to cut only the unnecessary part of the front end side and to arrange the shape of the front end surface of the boss part. Therefore, it is not necessary to cut the spline part in the cutting step. Further, as in the prior art, a deburring process for removing burrs generated by cutting the spline portion is not necessary, and productivity can be improved.

  Further, in the spline base surface forming step, the spline base surface is provided at a position corresponding to the axial end surface position of the spline portion to be formed. Therefore, in the spline forming step, in addition to being able to align the starting point of the spline part with the spline base point surface, the spline part is accurately formed at a desired position with a desired length from the spline base point surface. Can do. Thereby, the quality improvement of the said spline member obtained can be aimed at.

  Thus, according to the manufacturing method of the present invention, it is possible to obtain a spline member which does not require a deburring step and can improve productivity.

In the present invention, in the boss forming step, when the spline base point surface is formed on the inner peripheral side portion of the front end surface of the boss portion, the inner diameter of the spline base point surface is at the front end of the boss portion. It is preferable to incline so as to gradually expand the diameter (claim 2).
In this case, in the spline forming step, the spline portion can be easily formed on the inner peripheral surface of the boss portion along the axial direction from the spline base point surface.

Moreover, it is preferable that the inclination | tilt angle with respect to the axial direction of the said spline base point surface is 45 degrees-60 degrees.
When the inclination angle of the spline base surface with respect to the axial direction is less than 45 °, the spline formation step may cause a lack of thickness on the spline base surface side. On the other hand, if the angle exceeds 60 °, burrs may occur when unnecessary portions of the boss portion are cut in the cutting step.

Moreover, it is preferable that the maximum inner diameter of the spline base surface is equal to or larger than the inner diameter of the valley portion of the spline portion.
In this case, in the spline forming step, the spline portion can be accurately and reliably formed on the inner peripheral surface of the boss portion along the axial direction from the spline base point surface.

Further, in the boss forming step, when the spline base surface is formed on the outer peripheral side portion of the front end surface of the boss portion, the outer diameter of the spline base surface is gradually increased toward the front end of the boss portion. It is preferable to make it incline so that it may reduce in diameter.
In this case, in the spline forming step, the spline part can be easily formed on the outer peripheral surface of the boss part along the axial direction from the spline base point surface.

Moreover, it is preferable that the inclination | tilt angle with respect to the axial direction of the said spline base point surface is 45 degrees-60 degrees.
When the inclination angle of the spline base surface with respect to the axial direction is less than 45 °, in the spline formation step, there is a possibility that a hole is formed on the spline base surface side. On the other hand, if the angle exceeds 60 °, burrs may occur when unnecessary portions of the boss portion are cut in the cutting step.

Moreover, it is preferable that the minimum outer diameter of the spline base surface is equal to or smaller than the outer diameter of the valley of the spline portion.
In this case, in the spline forming step, the spline portion can be accurately and reliably formed on the outer peripheral surface of the boss portion along the axial direction from the spline base point surface.

Moreover, it is preferable that the radial direction width | variety of the said spline base point surface is 1-3 mm (Claim 8).
When the radial width of the spline base surface is less than 1 mm, the spline formation process may cause the meat to turn up when the spline portion is formed. On the other hand, when it exceeds 3 mm, the variation of the length of the spline portion becomes large in the spline forming step. For this reason, in the cutting step, burrs may be generated when unnecessary portions of the boss portion are cut.

In the boss forming step, a plate-like material provided with a through hole is prepared, a burring process is performed to plastically deform the periphery of the through hole in the vicinity of the through hole of the material into a cylindrical shape, and the boss portion Is preferably formed so as to protrude from the plate-like substrate portion.
In this case, for example, the boss portion can be easily formed even when the material is thin.

Further, in the boss forming step, the boss portion can be formed using a processing method other than the above. For example, a front extrusion method, a rear extrusion method, or a composite extrusion method in which these are simultaneously performed can be used.
Further, in this case, processing may be performed using a simple lump-shaped material, or processing may be performed using a material provided with a through hole as in the burring process. Moreover, when the raw material provided with the through hole is used, it can be carried out by inserting a mold (mandrel) at a predetermined position.

The spline member is preferably a carrier cover for a planetary gear of an automatic transmission.
In this case, the productivity of the carrier cover can be improved.
The spline member can be applied to various other parts having the spline part.

Example 1
The manufacturing method of the spline member concerning the Example of this invention is demonstrated using figures.
The spline member 1 manufactured in this example is a carrier cover for a planetary gear of an automatic transmission as shown in FIG.
The spline member 1 has a substrate portion 11 and a cylindrical boss portion 2 provided so as to protrude from the substrate portion 11. And the spline part 3 which provided the peak part 31 formed along the axial direction and the trough part 32 formed between the peak parts 31 by turns was formed in the internal peripheral surface 201 of the boss | hub part 2. Yes.

  In this example, when the spline member 1 is manufactured, as shown in FIGS. 2 to 13, at least a boss forming step, a spline base surface forming step, a spline forming step, and a cutting step are sequentially performed.

In the boss formation step, plastic processing is performed to plastically deform the material 100, and the cylindrical boss portion 2 is formed by being stretched in a free state without restricting the tip surface 21.
In the spline base surface forming step, the inner peripheral side portion of the front end surface 21 of the boss portion 2 is pressed in the axial direction so as to correspond to the axial end surface position of the spline portion 3 to be formed. Form.
In the spline formation step, the crest 31 formed along the axial direction from the spline base surface 22 and the trough 32 formed between the crests 31 are alternately provided on the inner peripheral surface 201 of the boss 2. The spline part 3 is formed.
In the cutting process, the unnecessary portion 200 on the tip side of the boss portion 2 relative to the spline formation region 30 is cut so as not to cut the spline formation region 30 of the boss portion 2.
This will be described in detail below.

  First, as shown in FIG. 2, a plate-like material 100 having a through hole 19 in the center is prepared and pre-formed. In this example, steel (SAPH440) was used as the material 100.

Next, a boss forming process is performed.
This step is performed by burring using a boss forming device 4 as shown in FIGS. As shown in the figure, the boss forming device 4 includes a boss forming punch 41 and a boss forming die 42 for forming the boss portion 2 on the material 100, and a boss forming provided on the outer peripheral side of the boss forming punch 41. And a knockout member 44 provided on the inner peripheral side of the boss forming die 42.

  The boss forming punch 41, the boss forming die 42, the boss forming plate presser 43, and the knockout member 44 are arranged coaxially. The boss forming punch 41 is provided so as to be movable in the axial direction relative to the boss forming die 42.

  In forming the boss portion 2 using the boss forming device 4, as shown in FIG. 3, the first surface 111 of the substrate portion 11 in the material 100 is supported by the boss forming die 42, and the second portion of the substrate portion 11 is formed. The surface 112 is supported by a boss forming plate presser 43. As a result, the material 100 is held between the boss forming die 42 and the boss forming plate presser 43.

  Then, as shown in FIG. 4, the boss forming punch 41 is relatively advanced, and the periphery of the through hole 19 in the vicinity of the through hole 19 of the material 100 is plastically deformed into a cylindrical shape in the forward direction of the boss forming punch 41. And the boss | hub part 2 extended | stretched in a free state without restraining the front end surface 21 is formed.

Thereafter, although not shown, the boss forming punch 41 and the boss forming plate presser 43 are retracted, and the knockout member 44 is advanced in the retracting direction of the boss forming punch 41 to support the boss forming die 42. Is released, and the first intermediate body 101 (FIG. 4) is taken out from the boss forming device 4.
Accordingly, as shown in FIGS. 5A and 5B, the first intermediate body 101 in which the tip surface 21 is formed so that the free-form boss portion 2 protrudes from the first surface 111 of the plate-like substrate portion 11. Get.

  Next, in this example, as shown in FIGS. 6A and 6B, a punching process for forming four first through holes 12 in the substrate portion 11 of the first intermediate body 101 is performed. Then, rough outline processing for adjusting the outer shape of the first intermediate body 101 is performed. Further, dimple processing for forming a dimple portion 121 around the through hole 12 is performed on the first surface 111 of the substrate portion 11, and the first surface 111 and the second surface 112 of the substrate portion 11 are formed around the through hole 12. A chamfering process for forming the chamfered portion 122 is performed. Thereby, the second intermediate 102 is obtained.

Next, a spline base point surface forming step is performed.
As shown in FIGS. 7 and 8, this step was performed using a spline base surface forming apparatus 5. As shown in the figure, the spline base point surface forming device 5 includes a spline base point surface forming counter punch 51 and a spline base point surface forming punch 52 for forming the spline base point surface 22 on the second intermediate body 102, and a spline base point surface. A spline base surface forming die 53 provided on the outer peripheral side of the forming counter punch 51, a spline base surface forming plate presser 54 provided on the outer peripheral side of the spline base surface forming punch 52, and a spline base surface forming A knockout member 55 is provided between the counter punch 51 and the spline base surface forming die 53.

  Further, the spline base point surface forming counter punch 51, the spline base point surface forming punch 52, the spline base point surface forming die 53, the spline base point surface forming plate presser 54, and the knockout member 55 are arranged coaxially. The spline base point surface forming counter punch 51 is provided to be movable in the axial direction relative to the spline base point surface forming punch 52, the spline base point surface forming die 53, and the spline base point surface forming plate presser 54. ing. Further, the spline base point surface forming counter punch 51 has a spline base point surface forming portion 511 having a shape corresponding to the spline base point surface 22.

  In forming the spline base surface 22 using the spline base surface forming device 5, as shown in FIG. 7, the first surface 111 of the substrate portion 11 and the outer peripheral surface 202 of the boss portion 2 in the second intermediate body 102 are splined. It is supported by the base surface forming die 53. Further, the second surface 112 of the substrate portion 11 and the rear end surface 29 of the boss portion 2 are supported by a spline base surface forming plate presser 54 and a spline base surface forming punch 52. As a result, the second intermediate body 102 is sandwiched between the spline base surface surface forming die 53, the spline base surface surface forming punch 52, and the spline base surface surface forming plate presser 54.

Then, as shown in FIG. 8, the spline base surface forming counter punch 51 is relatively advanced so that the inner peripheral side portion of the tip surface 21 of the boss portion 2 is spline base surface forming counter punch 51. The spline base surface 22 is formed by pressing in the axial direction by the forming portion 511.
At this time, the spline reference surface 22 is formed at a position corresponding to the axial end surface position of the spline portion 3 to be formed by mechanically controlling the relative movement distance of the counter punch 51 for forming the spline reference surface. Form. In this example, it adjusts according to the length of the spline part 3 which forms the distance from the board | substrate part 11 to the spline base point surface 22. FIG. Further, by inclining the shape of the spline base surface forming portion 511, the spline base surface 22 is inclined so that its inner diameter gradually increases toward the tip of the boss portion 2.

  After that, although not shown, the spline base surface forming counter punch 51 is retracted, the support of the spline base surface forming punch 52 and the spline base surface forming plate presser 54 is released, and the knockout member 55 is formed of the spline base surface. The counter punch 51 is advanced in the forward direction. And the 3rd intermediate body 103 (FIG. 8) is taken out from the spline origin surface forming apparatus 5. FIG.

As a result, as shown in FIGS. 9A to 9C, the third intermediate body 103 having the spline base surface 22 formed on the inner peripheral side of the tip surface 21 of the boss portion 2 is obtained.
In this example, as shown in FIG. 9B, the distance from the first surface 111 of the substrate portion 11 to the inner peripheral end 221 of the spline base surface 22 is adjusted to be constant, and the distance d Is 12.2 mm. The maximum inner diameter a of the spline base surface 22 is the inner diameter of the outer peripheral end 222 of the spline base surface 22 and is 36.2 mm.
Further, as shown in FIG. 9C, the inclination angle α with respect to the axial direction of the spline base surface 22 is 60 °, and the radial width b of the spline base surface 22 is 1.3 mm.

Next, a spline forming process is performed.
This step was performed using a spline forming apparatus 6 as shown in FIGS. As shown in the figure, the spline forming device 6 includes a shaving punch 61 and a shaving die 62 for forming the cutout portion 13 in the outer peripheral portion of the substrate portion 11 in the third intermediate body 103, and the inner peripheral surface of the boss portion 2. A spline punch 63 to be inserted into 201 to form the spline portion 3, a stripper 64 for supporting the first surface 111 of the substrate portion 11 and the outer peripheral surface 202 of the boss portion 2, and a pressure receiving member for regulating the backward movement of the stripper 64 65 and a knockout member 66 provided between the spline punch 63 and the stripper 64.

  Further, the shaving punch 61, the shaving die 62, the spline punch 63, the stripper 64, the pressure receiving member 65, and the knockout member 66 are arranged coaxially. A stripper 64 is disposed on the outer peripheral side of the spline punch 63, and a shaving die 62 is disposed on the outer peripheral side of the stripper 64. Further, a spline punch 63 is disposed so as to face the stripper 64 in the axial direction. A shaving punch 61 is provided so as to be relatively movable in the axial direction with respect to the shaving die 62 and the spline punch 63, and a stripper 64 is provided so as to be retracted relatively by the pressing force of the shaving punch 61. Yes.

  In forming the spline portion 3 using the spline forming apparatus 6, the stripper 64 supports the first surface 111 of the substrate portion 11 and the outer peripheral surface 202 of the boss portion 2 in the third intermediate body 103 as shown in FIG. To do.

  Then, as shown in FIG. 11A, the shaving punch 61 is relatively advanced toward the stripper 64 and brought into contact with the second surface 112 of the substrate portion 11 and the rear end surface 29 of the boss portion 2. As a result, the third intermediate 103 is held between the shaving punch 61 and the stripper 64.

  Further, the shaving punch 61 is relatively advanced while pressing the third intermediate 103 and the stripper 64, and a shearing force is applied to the third intermediate 103 by the shaving punch 61 and the shaving die 62. As a result, the shaving region 130 (FIG. 12A) of the third intermediate body 103 is shaved, and the four cutout portions 13 are formed in the outer peripheral portion of the substrate portion 11.

  Next, as shown in FIG. 11B, the shaving punch 61 is relatively advanced while the outer peripheral surface of the substrate portion 11 is restrained by the shaving die 62, and the spline punch 63 is inserted into the inner peripheral surface 201 of the boss portion 2. Thus, the spline part 3 is formed. As a result, the inner peripheral surface 201 of the boss portion 2 is plastically deformed to form a spline portion 3 (12 (b)) in which peaks 31 and valleys 32 are alternately provided along the axial direction from the spline base point surface 22. To do.

  Next, as shown in FIG. 11C, the shaving punch 61 is further advanced relatively, and the stripper 64 is brought into contact with the pressure receiving member 65 to stop the retreat of the stripper 64. Then, coining is performed on the coining region 140 (FIG. 12A) on the second surface 112 of the substrate portion 11 by the pressing force of the shaving punch 61. Thereby, the coining process part 14 (FIG. 12A) is formed in the 2nd surface 112 of the board | substrate part 11. FIG.

  Thereafter, although not shown, the shaving punch 61 is retracted, and the knockout member 66 is advanced in the retracting direction of the shaving punch 61. And the 4th intermediate body 104 (FIG. 12) is taken out from the spline formation apparatus 6. FIG.

  As a result, as shown in FIGS. 12A and 12B, the fourth intermediate body 104 in which the spline portion 3 in which the crest portions 31 and the trough portions 32 are alternately provided on the inner peripheral surface 201 of the boss portion 2 is formed. obtain. In the fourth intermediate 104, four cutout portions 13 are formed on the outer peripheral portion of the substrate portion 11, and a coining processing portion 14 is formed on the second surface 112 of the substrate portion 11. The maximum inner diameter b of the spline part 3 is the inner diameter of the valley part 32 of the spline part 3 and is 36.2 mm.

  Next, as shown in FIGS. 13A and 13B, a finish hole punching process for forming two second through holes 15 in the substrate portion 11 of the fourth intermediate body 104 is performed.

Next, a cutting process is performed.
In this step, as shown in FIGS. 13A and 13B, the tip surface 21 of the boss portion 2 that is free-form is ground, and the shape of the tip surface 21 of the boss portion 2 of the fourth intermediate body 104 is changed. Arrange. At this time, the unnecessary part 200 on the tip side of the spline formation region 30 of the boss 2 is cut so as not to cut the spline formation region 30 of the boss 2.
Thus, the spline member 1 (FIG. 1) is obtained.

Next, the effect in the manufacturing method of the spline member 1 of this example is demonstrated.
In the method for manufacturing a spline member of the present invention, the spline base surface forming step is performed before the spline forming step. That is, before the spline portion 3 is formed on the boss portion 2, a spline base point surface 22 serving as a base point for forming the spline portion 3 is provided in advance on the tip surface 21 of the boss portion 2. Then, in the spline forming step, the spline part 3 is formed so that the spline base point face 22 becomes the axial end face of the spline part 3 with the spline base point face 22 of the boss part 2 as a base point.

  Therefore, the starting point of the spline part 3 to be formed can be aligned with the spline base point surface 22 that is the axial end surface of the spline part 3. Thereby, in the subsequent cutting process, when cutting the front end surface 21 of the free-form boss portion 2, the front end side of the spline base surface 22 which is the axial end surface of the spline portion 3, that is, the spline formation region 30. Only the unnecessary portion 200 on the distal end side may be cut and the shape of the distal end surface 21 of the boss portion 2 may be adjusted. Therefore, it is not necessary to cut the spline portion 3 in the cutting process. And the burr removal process which remove | eliminates the burr | flash which generate | occur | produced by cutting the spline part 3 like the past is unnecessary, and it can aim at the improvement of productivity.

  In the spline base surface forming step, a spline base surface is provided at a position corresponding to the axial end surface position of the spline portion 3 to be formed. Therefore, in the spline forming process, in addition to being able to align the starting point of the spline part 3 with the spline base point surface 22, the spline part 3 can be accurately formed at a desired position with a desired length from the spline base point surface 22. it can. Thereby, the quality improvement of the spline member 1 obtained can be aimed at.

  Further, in this example, in the boss forming step, the spline base point surface 22 is inclined so that its inner diameter gradually increases toward the tip of the boss part 2. Further, the inclination angle α with respect to the axial direction of the spline base surface 22 is 60 °. Therefore, in the subsequent spline forming step, the spline portion 3 can be easily formed on the inner peripheral surface 201 of the boss portion 2 along the axial direction from the spline base surface 22.

  Thus, according to the manufacturing method of the present invention, it is possible to obtain a spline member which does not require a deburring step and can improve productivity.

In this example, in the boss forming step, as shown in FIGS. 3 and 4, a plate-like material 100 provided with a through hole 19 is prepared, and the periphery of the through hole 19 in the vicinity of the through hole 19 of the material 100 is a cylinder. The boss portion 2 is formed by performing a burring process that is plastically deformed into a shape. For example, the boss portion 2 is formed by using a forward extrusion method, a backward extrusion method, or a composite extrusion method that simultaneously performs these methods. You can also.
Further, in this case, processing may be performed using a simple lump material, or processing may be performed using a material provided with a through hole as in the burring process of this example. Moreover, when the raw material provided with the through hole is used, it can be carried out by inserting a mold (mandrel) at a predetermined position.

(Example 2)
In this example, the spline member 1 of the first embodiment is incorporated in the planetary gear 8.
In the planetary gear 8, as shown in FIG. 14, a carrier cover that is the spline member 1 is disposed on the outer periphery of the hollow shaft 81 via an input flange 85. A bearing 82 is disposed on the rear end side of the boss portion 2 of the spline member 1.

  Further, the spline member 1 is joined with other members such as a pinion shaft 83 and a carrier 84. The coining portion 14 of the spline member 1 functions as a seating surface for the washer of the pinion shaft 83. Further, the notch 13 functions as a welded portion with the carrier 84.

  Moreover, the spline member 1 and the input flange 85 are engaged with each other by the splines. That is, a spline portion 850 is formed on the outer peripheral surface of the input flange 85, and this is engaged with the spline portion 3 on the inner peripheral surface 201 of the boss portion 2 of the spline member 1.

  In the planetary gear 8 of this example, as described above, the spline base surface 22 is provided before the spline portion 3 is formed, so that a deburring step is not required and the spline can be improved in productivity. By using the member 1, the processing cost of the entire planetary gear 8 can be reduced.

FIG. 3 is an explanatory view showing the entire spline member in the first embodiment. (A) The top view which shows a raw material in Example 1, (b) AA sectional view taken on the line of (a). Explanatory drawing which shows the state before forming the boss | hub part in Example 1. FIG. Explanatory drawing which shows the state immediately after forming the boss | hub part in Example 1. FIG. (A) The top view which shows a 1st intermediate body in Example 1, (b) The BB sectional drawing of (a). (A) The top view which shows a 2nd intermediate body in Example 1, (b) CC sectional view taken on the line of (a), (c) The enlarged view of the front end surface of a boss | hub part. Explanatory drawing which shows the state in Example 1 before forming a spline base point surface. Explanatory drawing which shows the state immediately after forming the spline base point surface in Example 1. FIG. (A) The top view which shows a 3rd intermediate body in Example 1, (b) DD sectional view taken on the line of (a). Explanatory drawing which shows the state in Example 1 before forming a spline part. Explanatory drawing which shows the process in which the spline part in Example 1 is formed. (A) The top view which shows a 4th intermediate body in Example 1, (b) The EE sectional view taken on the line of (a). (A) The top view which shows a spline member in Example 1, (b) The FF sectional view taken on the line of (a). Explanatory drawing which shows the structure of the planetary gear of the state which incorporated the spline member in Example 2. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Spline member 11 Board | substrate part 2 Boss part 201 Inner peripheral surface (inner peripheral surface of a boss part)
21 Tip surface (tip surface of boss)
22 Spline base surface 3 Spline part 30 Spline formation area

Claims (10)

A boss forming step for forming a cylindrical boss portion by performing plastic working to plastically deform the material and stretching in a free state without constraining the tip surface;
A spline base surface that forms a spline base surface at a position corresponding to the axial end surface position of the spline portion to be formed by pressing the inner peripheral portion or the outer peripheral portion of the tip surface of the boss portion in the axial direction. Forming process;
Spline portions are formed on the inner peripheral surface or outer peripheral surface of the boss portion by alternately providing peaks formed along the axial direction from the spline base surface and valleys formed between the peaks. Spline forming process;
And a cutting step of cutting an unnecessary portion of the boss portion closer to the tip than the spline formation region so as not to cut the spline formation region of the boss portion.   2. The boss forming step according to claim 1, wherein, when the spline base point surface is formed on the inner peripheral side portion of the tip surface of the boss part, the inner diameter of the spline base point surface is set to the tip of the boss part. A method of manufacturing a spline member, characterized by being inclined so as to gradually expand in diameter.   3. The method of manufacturing a spline member according to claim 2, wherein an inclination angle of the spline base surface with respect to the axial direction is 45 ° to 60 °.   4. The method of manufacturing a spline member according to claim 2, wherein the maximum inner diameter of the spline base surface is equal to or larger than the inner diameter of the valley portion of the spline portion.   2. The boss forming step according to claim 1, wherein, when the spline base point surface is formed on the outer peripheral side portion of the tip surface of the boss part, the outer diameter of the spline base point surface is at the tip of the boss part. A method of manufacturing a spline member, wherein the method is inclined so that the diameter gradually decreases.   6. The method of manufacturing a spline member according to claim 5, wherein an inclination angle of the spline base surface with respect to the axial direction is 45 ° to 60 °.   7. The method of manufacturing a spline member according to claim 5, wherein a minimum outer diameter of the spline base surface is equal to or smaller than an outer diameter of the valley portion of the spline portion.   The method of manufacturing a spline member according to any one of claims 1 to 7, wherein a radial width of the spline base surface is 1 to 3 mm.   In any 1 item | term of the Claims 1-8, in the said boss | hub formation process, the said plate-shaped raw material which provided the through-hole was prepared, and the circumference | surroundings of this through-hole in the vicinity of the said through-hole of this raw material are cylindrically plasticized. A method of manufacturing a spline member, comprising performing burring processing to deform and forming the boss portion so as to protrude from a plate-like substrate portion.   The method of manufacturing a spline member according to any one of claims 1 to 9, wherein the spline member is a carrier cover for a planetary gear of an automatic transmission.

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