JP2012115863A - Method for manufacturing circular plate member, and sizing die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a circular plate member, which corrects a shape of a circular plate member into a true circle shape using a sizing die to improve the circularity of the circular plate member even when the circularity of the circular plate member is deteriorated by a heating treatment, and to provide a sizing die.SOLUTION: In a sizing step, when manufacturing a clutch hub, after sintering a clutch hub having an outer circumference formed with a plurality of key grooves, the method uses the sizing die 41 including a fitting hole 43 having a circular inner circumference 42 and a plurality of protrusions 45 protruding radiationally inward from the inner circumference 42, wherein a curved surface of the inner circumference 42 is formed so that the inner diameter of the inner circumference 42 is increased as proceeding to the protrusions 45, to position the key grooves of a sintered body of the clutch hub at the protrusions 45 and press fit the clutch hub into the fitting hole 43, thereby correcting dimensions thereof.

Description

  The present invention relates to a disk member and a method for manufacturing the disk member, and after the disk member having an outer peripheral groove on the outer peripheral portion is formed by heat treatment, the disk member is subjected to dimension correction by a sizing die. The present invention relates to a member manufacturing method and a sizing mold.

  In a manual transmission of a vehicle, when a shift operation for shifting is performed, in order to establish a new gear stage, it is known to use a synchronous meshing device that completes the shift operation after rotationally synchronizing meshing gears. It has been.

  As this synchronous meshing device, the one shown in FIG. 7 is known. In FIG. 7, the clutch hub 15 assembled on the rotary shaft 16 so as to be able to transmit torque, the sleeve 11 supported on the clutch hub 15 so as to be movable in the axial direction and capable of transmitting torque, and loose on the rotary shaft 16. Between the fitted gears 10A and 10B, the gear pieces 13 and 14 that rotate integrally with the gears 10A and 10B, and the sleeve 11 and the gear pieces 13 and 14, respectively, and between the sleeve 11 and the gear pieces 13 and 14, respectively. And synchronizer rings 17 and 18 for transmitting torque by frictional force, and a shift fork 12 for moving the sleeve 11 in the axial direction.

  Further, as shown in FIG. 8, a hub spline 15A that is fitted to the sleeve spline 11A is formed on the outer peripheral portion of the clutch hub 15, and the hub spline 15A has a constant in the circumferential direction of the clutch hub 15. Key grooves 15a are formed at intervals.

  The key groove 15 a is pressed by a positioning surface provided on the inner peripheral portion of the sleeve 11 by an elastic member to position the sleeve 11 on the rotary shaft 16, while being operated by an axial operation force applied to the sleeve 11. When the elastic member is elastically deformed, a synchronizer key 15b that allows the sleeve 11 to move in the axial direction is housed.

  Further, the sleeve spline 11A and the gear piece splines 13A and 14A are engaged with each other after the rotation of the sleeve 11 side and the gear pieces 13 and 14 is synchronized by the action of the synchronizer rings 17 and 18 when the sleeve 11 moves in a predetermined direction. It is supposed to be.

  Thus, torque is transmitted from the rotary shaft 16 to any one of the gears 10A and 10B via any one of the clutch hub 15, the sleeve 11, and the gear pieces 13 and 14.

  By the way, in this synchronous meshing device, for example, a so-called gear missing (shift missing) may occur in which the meshing between the sleeve 11 and the gear pieces 13 and 14 is naturally released due to vibration or the like.

  In order to prevent the gear from coming off, there is one in which the shapes of the sleeve spline 11A and the gear piece spline 13A are devised, as shown in FIG. 9 (see, for example, Patent Document 1).

  In FIG. 9, the tooth surface of the sleeve spline 11 </ b> A of the sleeve 11 is formed with a tapered tooth surface 11 a having a taper angle Q <b> 1 so that the tooth width of the sleeve spline 11 </ b> A increases toward the tooth tip side. A tapered tooth surface 13a having a taper angle Q2 is formed on the tooth surface of the piece spline 13A so that the tooth width of the gear piece spline 13A increases toward the tooth tip side. In addition, a slope 11b facing the tooth base side is formed on the tooth tip side of the taper tooth surface 11a, and a chamfered surface 13b facing the tooth base side is formed on the tooth base side of the taper tooth surface 13a. .

  This synchronous meshing device operates the shift fork 12 to displace the sleeve 11 in the axial direction from the neutral position, and synchronizes the rotation of the gear piece 13 (14) and the sleeve 11 by the action of the synchronizer rings 17 and 18, and thereby the gear piece. 13 (14) and the sleeve 11 are engaged, that is, in the state where the tapered tooth surfaces 11a and 13a face each other, when there is torque input or fluctuation, the inclined surface 11b and the chamfered surface 13b are brought into sliding contact with each other. A gear drop prevention force can be generated.

  In this way, a large gear slip prevention force is generated by the sliding contact between the inclined surface 11b and the chamfered surface 13b, so that even if the taper angles Q1 and Q2 of the taper surfaces 11a and 13a are reduced, a predetermined gear slip prevention force can be obtained. The amount of suction of the sleeve 11 when the suction force acts on the sleeve 11 can be reduced.

  By the way, this synchronous meshing device forms a tapered tooth surface 11a, a tapered tooth surface 13a, an inclined surface 11b and a chamfered surface 13b on the sleeve 11 and the gear piece 13 in order to prevent the sleeve 11 and the gear pieces 13 and 14 from coming off the gear. There is a need to. For this reason, manufacture of a synchronous meshing apparatus is troublesome, and the freedom degree of design of a synchronous meshing apparatus will fall.

  On the other hand, as described above, the clutch hub 15 having the keyway 15a on the outer peripheral portion is subjected to heat treatment such as compacting and sintering the raw material powder into the shape of the clutch hub 15, and then the clutch hub 15 is moved. In general, the sizing die is sized so that the dimension of the clutch hub 15 is corrected (see, for example, Patent Document 2).

  This sizing die has a cavity (fitting hole) into which the clutch hub 15 is fitted. The size of the clutch hub 15 is adjusted by fitting the clutch hub 15 into the cavity and applying pressure. I have to.

JP 2008-51142 A JP 2009-167477 A

  However, when the clutch hub 15 is formed by heat treatment such as sintering, a portion having a large radial thickness (hereinafter referred to as a thickness) located between the key groove 15a and the key groove 15a due to the influence of high-temperature heat. The meat portion 19) expands outward in the radial direction and forms a so-called petal shape.

That is, as shown in FIG. 10, when the clutch hub 15 is sintered, it is also desired that the roundness of the root circle A of the hub spline 15A that is the outer peripheral portion of the clutch hub 15 is increased. Regardless, when the thick wall portion 19 expands, the root circle B of the clutch hub 15 is bent radially outward from the root circle A to be a perfect circle, and the roundness of the clutch hub 15 is increased. Will get worse.
In FIG. 10, the deviation between the root circle A and the root circle B is extremely represented, but the actual deviation amount between the root circle A and the root circle B is in units of μm.

  As schematically shown in FIG. 11, the thick portion 19 expands to form a petal shape, the amount of expansion of the thick portion 19 is small at the portion closest to the keyway 15 a, It becomes large as it goes to the center part of the circumferential direction between the key groove 15a and the key groove 15a from the groove | channel 15a.

  The present applicant has found that the above-described phenomenon occurs during the heat treatment as described above, and has discovered that this phenomenon is one of the causes of gear loss.

  That is, when the thick portion 19 is generated in the clutch hub 15, at the time of shifting, for example, in a state where the hub spline 15A of the clutch hub 15 is engaged with the sleeve spline 11A of the sleeve 11, the engagement of the hub spline 15A and the sleeve spline 11A is achieved. The accuracy deteriorates and the pull-out force at the contact portion between the hub spline 15A and the sleeve spline 11A increases.

  In order to prevent the occurrence of such gear loss, it is conceivable to select a raw material powder material in order to prevent the thick portion 19 from expanding radially outward during sintering. Requires expensive raw material powder, which may increase the manufacturing cost of the clutch hub 15.

  The present invention has been made in order to solve the above-described conventional problems. Even when the roundness of the disk member is reduced by the heat treatment, the disk member is formed using a sizing mold. It is an object of the present invention to provide a manufacturing method and a sizing die for a disk member that can be corrected to a perfect circle and can improve the roundness of the disk member.

  In order to achieve the above object, the disk member manufacturing method according to the present invention includes: (1) a heat treatment step of forming a disk member having at least one outer peripheral groove formed in the outer peripheral portion by heat treatment; A fitting hole having an inner peripheral portion and at least one protrusion projecting radially inward from the inner peripheral portion, so that the inner diameter of the inner peripheral portion increases toward the protrusion. And a sizing step in which the outer circumferential groove is aligned with the protrusion and the disk member is press-fitted into the fitting hole.

  This method of manufacturing a disk member is applied when the roundness of the disk member is reduced due to expansion of the radially thick portion between the outer circumferential grooves in the heat treatment step due to expansion outward in the radial direction. Using a sizing mold in which the curved surface of the inner peripheral portion is formed so that the inner diameter of the inner peripheral portion of the joint hole increases toward the protrusion, and aligning the outer peripheral groove with the protrusion of the sizing die By press-fitting into the fitting hole of the sizing mold and correcting the dimension of the disk member, the expanded part of the outer peripheral part of the disk member can be corrected to a perfect circle by the inner peripheral part of the fitting hole. it can.

  For this reason, the roundness of the disk member can be increased. For example, when the disk member is applied to a clutch hub, the accuracy of engagement between the hub spline of the clutch hub and the sleeve spline of the sleeve is improved. Can do. The pull-out force between the hub spline of the clutch hub and the sleeve spline of the sleeve can be reduced, so that it is possible to prevent so-called gear slippage, in which the sleeve slips out of the clutch hub due to vibration or the like.

  In addition, since the outer periphery of the disk member can be corrected to a perfect circle using a sizing mold that devises the shape of the inner periphery of the fitting hole, the disk member is manufactured without using an expensive material. It is possible to prevent the manufacturing cost of the disk member from increasing.

  In the manufacturing method of the disk member according to (1) above, (2) in the heat treatment step, external teeth are formed on the outer peripheral portion of the disk member, and in the sizing step, the circular inner peripheral portion is formed. A clutch hub is manufactured as a disk member by press-fitting the disk member into the fitting hole using a sizing mold in which internal teeth are formed.

  Since this disc member manufacturing method can increase the roundness of the clutch hub, the pulling force between the hub spline of the clutch hub and the sleeve spline of the sleeve can be reduced, and the occurrence of gear slippage can be prevented. can do.

  In the method for manufacturing a disk member according to (1) or (2), (3) the heat treatment step is a sintering step.

  In this manufacturing method of the disk member, since the disk member is formed by sintering, the portion having a large radial thickness between the outer circumferential grooves is expanded outward in the radial direction in the heat treatment process. Even when the roundness of the disk member is reduced, the outer periphery of the disk member can be corrected to a perfect circle by correcting the dimensions of the disk member using a sizing mold. For this reason, the manufacturing cost of a disk member can be reduced and a high-strength disk member can be obtained, without impairing the advantage by sintering.

  A sizing mold used in the method for manufacturing a disk member according to any one of the above (1) to (3), wherein (4) the sizing mold has a fitting hole having a circular inner periphery, and A curved surface of the inner peripheral portion is formed so as to include at least one or more projecting portions projecting radially inward from the inner peripheral portion, and an inner diameter of the inner peripheral portion increases toward the projecting portion. It is composed of things.

  In the heat treatment step, when the circularity of the disk member is reduced due to expansion of the radially thick portion between the fitting holes radially outward, the inner diameter of the fitting hole is reduced. Using a sizing mold in which the curved surface of the inner peripheral part is formed so that the inner diameter of the peripheral part increases toward the protrusion, the outer peripheral groove is aligned with the protrusion of the sizing mold, and the disk member is sized. The outer peripheral portion of the disk member can be corrected to a perfect circle by press-fitting into the fitting hole and correcting the dimension of the disk member.

  (4) In the sizing mold of (4), (5) a circumference of the inner peripheral part having a plurality of protrusions spaced apart in the circumferential direction of the inner peripheral part, and connecting a projecting direction center line of the protruding part The inner diameter of the substantially central portion in the direction is the smallest, and the inner diameter is curved so that the inner diameter increases from the central portion in the circumferential direction toward the center line in the protruding direction of the protrusion.

  In the present invention, when a disc member is formed by heat-treating a disc member having a plurality of fitting holes on the outer peripheral portion, a portion having a large radial thickness between the plurality of fitting holes is outside the radial direction. When the roundness decreases and the roundness decreases, the inner diameter of the inner circumferential part connecting the projecting direction center line of the projecting part is the smallest, and the projecting part protrudes from the circumferential central part. The dimensional correction of the disk member is performed using a sizing mold that is curved so that the inner diameter becomes larger toward the direction center line.

  In this way, the outer peripheral part of the disc member having a plurality of outer peripheral grooves can be corrected to a perfect circle.

  According to the present invention, even when the roundness of the disk member is reduced by the heat treatment, the disk member can be corrected to a perfect circle using the sizing mold, and the true circle of the disk member can be corrected. It is possible to provide a method of manufacturing a disk member and a sizing mold that can improve the degree of deformation.

It is a figure which shows one Embodiment of the manufacturing method of the disc member which concerns on this invention, and a sizing metal mold | die, It is sectional drawing of a synchronous meshing apparatus. It is a figure which shows one Embodiment of the manufacturing method of the disc member which concerns on this invention, and a sizing metal mold | die, It is a front view of a clutch hub. It is a figure which shows one Embodiment of the manufacturing method of the disc member which concerns on this invention, and a sizing metal mold | die, and is a top view of a sizing metal mold | die. It is a figure which shows one Embodiment of the manufacturing method of the disc member which concerns on this invention, and a sizing metal mold | die, It is a principal part block diagram of a sizing metal mold | die. It is a figure which shows one Embodiment of the manufacturing method of the disc member concerning this invention, and a sizing metal mold | die, and is a schematic diagram of the clutch hub used as the petal shape. It is a figure which shows one Embodiment of the manufacturing method of the disc member which concerns on this invention, and a sizing metal mold | die, and is a figure which shows the state by which the clutch hub was press-fit in the sizing metal mold | die. It is sectional drawing of the conventional synchronous meshing apparatus. It is a front view of the conventional clutch hub. It is a figure which shows the meshing state of the conventional sleeve spline and gear piece spline. It is a figure which shows the state which the thick part of the conventional clutch hub expanded. It is a schematic diagram of the clutch hub which became a petal shape.

Embodiments of a disk member manufacturing method and a sizing mold control device according to the present invention will be described below with reference to the drawings.
1-6 is a figure which shows one Embodiment of the manufacturing method of the disc member based on this invention, and a sizing metal mold | die.

First, the configuration will be described.
In FIG. 1, a rotating shaft 21 of the synchronous meshing device 1 is rotatable about a rotation center shaft 21a, and a rotational force from an internal combustion engine (not shown) is transmitted. A clutch hub 22 as a disk member is attached to the outer peripheral portion of the rotating shaft 21, and the clutch hub 22 is splined to the rotating shaft 21 so as to rotate together with the rotating shaft 21.

  Gears 23 and 24 are attached to the rotating shaft 21, and the gears 23 and 24 are rotatable relative to the rotating shaft 21. That is, in the neutral state shown in FIG. 1, the rotational force of the rotating shaft 21 is not transmitted to the gears 23 and 24, and the gears 23 and 24 are idled.

  Gear pieces 25 and 26 are spline fitted to the gears 23 and 24, and the gear pieces 25 and 26 rotate together with the gears 23 and 24. The gear pieces 25 and 26 are rotatable with respect to the clutch hub 22 because they do not receive force from the clutch hub 22 in the state shown in FIG.

  The gear pieces 25 and 26 include cone portions 27 and 28 which are tapered surfaces inclined with respect to the rotation shaft 21, and synchronizer rings 29 and 30 are fitted on the cone portions 27 and 28.

  The synchronizer rings 29 and 30 are devices for synchronizing the rotations of the gear pieces 25 and 26 and the clutch hub 22 and have cone portions 31 and 32 having tapered surfaces. The cone portions 31 and 32 of the synchronizer rings 29 and 30 are in contact with the cone portions 27 and 28 of the gear pieces 25 and 26. The synchronizer rings 29 and 30 and the gear pieces 25 and 26 are in contact with the cone portions 27, 28, 31 and 32. Friction sliding through.

  A sleeve spline 34a of a sleeve 34 is fitted to a hub spline 22b that is an external tooth of the clutch hub 22, and the sleeve 34 is slidable in a direction in which the rotary shaft 21 extends.

  The sleeve spline 34a of the sleeve 34 meshes with the hub spline 22b of the clutch hub 22, and the clutch hub 22 holds the sleeve 34 slidably.

  When the sleeve 34 approaches the gear 23, the sleeve spline 34 a of the sleeve 34 meshes with the gear piece spline 25 a of the gear piece 25 and the synchronizer spline 29 a of the synchronizer ring 29, whereby the rotation of the clutch hub 22 is performed via the sleeve 34. And transmitted to the gear 23.

  The sleeve 34 has an annular shift fork groove 34b. A shift fork 36 is fitted into the shift fork groove 34b, and the sleeve 34 is slid in the axial direction by the shift fork 36. .

  As shown in FIG. 2, the clutch hub 22 includes a boss portion 22A in which an inner peripheral spline 22a that is spline-fitted to the rotary shaft 21 is formed, and a hub portion 22B that extends radially outward from the boss portion 22A. And a hub spline 22b as external teeth provided on the outer peripheral portion of the hub portion 22B.

  A plurality of key grooves 37 as outer peripheral grooves that are spaced apart in the circumferential direction are formed in the outer peripheral portion of the hub portion 22B, and a synchronizer key 38 is fitted in the key groove 37 as shown in FIG. . In FIG. 1, the convex portion 38 a of the synchronizer key 38 is fitted with the sleeve 34, and the synchronizer key 38 is slidable in the axial direction together with the sleeve 34.

  When the synchronizer key 38 slides, an axial force is applied to the synchronizer rings 29 and 30, and this force is transmitted to the cone portions 27, 28, 31 and 32, and the cone portions 27, 28, 31 and 32 A frictional resistance is generated, and a synchronous operation is performed between the synchronizer rings 29 and 30 and the gear pieces 25 and 26.

  Then, after synchronization, the sleeve spline 34a, the gear piece spline 25a, and the synchronizer spline 29a mesh with each other, whereby the power of the internal combustion engine is transmitted to the gear 23 via the clutch hub 22, the sleeve 34, and the gear piece 25.

  FIG. 3 shows a sizing die for sizing the clutch hub 34.

  The sizing mold 41 is formed with a fitting hole 43 having a circular inner peripheral portion 42, and the clutch hub 22 is fitted into the fitting hole 43 in the inner peripheral portion 42 of the fitting hole 43. An internal tooth 44 is formed to which the hub spline 22b of the clutch hub 22 is sometimes fitted.

  A plurality of protrusions 45 are formed on the inner peripheral portion of the fitting hole 43, and the protrusion 45 protrudes inward in the radial direction from the inner peripheral portion 42 of the fitting hole 43.

  The curved surface of the inner peripheral portion 42 is formed so that the inner diameter of the inner peripheral portion 42 of the fitting hole 43 increases toward the protrusion 45, and the curved surface of the inner peripheral portion 42 is an internal tooth indicated by a virtual line. 44 is a curved surface of a root circle 46 of 44. Therefore, the sizing mold 41 of the present embodiment has an inverted petal shape.

  Specifically, as shown in FIG. 4, the curved surface of the inner peripheral portion 42 is a root circle of the inner tooth 44 that is the inner peripheral portion 42 of the fitting hole 43 that connects the projecting direction center line 45 a of the protruding portion 45. 46 is curved so that the inner diameter of the root circle 46 of the inner teeth 44 increases from the center in the circumferential direction toward the center line in the protruding direction of the protrusion 45. .

  4 shows the inner diameter of the inner peripheral portion 42 from the central portion in the circumferential direction toward the projection 45 when the inner diameter in the central portion in the circumferential direction of the root circle 46 of the inner tooth 44 is defined as “X0”. Is increased in the + direction from X0 to X7 (XN). For this reason, the inner diameter of the tip circle of the inner teeth 44 also has a curved surface that increases from the center in the circumferential direction toward the protrusion 45.

That is, the inner peripheral portion 42 of the fitting hole 43 has the shortest distance from the central axis of the clutch hub 22 to the central portion in the circumferential direction of the inner peripheral portion 42 and is closest to the protrusion 45 from the central axis of the clutch hub 22. The distance of the part to perform is the largest.
For convenience of explanation, the deviation between the curved surface of the inner peripheral portion 42 of the fitting hole 43 and the perfect circle 48 is shown. However, the actual deviation amount between the curved surface of the inner peripheral portion 42 and the perfect circle 48 is in units of μm. is there.

Next, a method for manufacturing the clutch hub 22 will be described.
First, a raw material powder made of iron, copper, and carbon is compacted into a shape of the clutch hub 22 and sintered, and then a sintered body of the clutch hub 22 is formed (heat treatment step). At this time, by heating the sintered body of the clutch hub 22 at a high temperature, the sintered body of the clutch hub 22 is located between the key groove 37 and the key groove 37 under the influence of the high-temperature heat, and is in the radial direction. A part having a large thickness (hereinafter referred to as a thick part 47) expands outward in the radial direction, resulting in a petal shape. FIG. 5 schematically shows a state in which the thick part 47 has expanded to form a petal shape.

  After sintering, the sintered body of the clutch hub 22 is sized by the sizing die 41. In this sizing process, after the key groove 37 formed in the sintered body of the clutch hub 22 is aligned with the protrusion 45, the clutch hub 22 is press-fitted into the fitting hole 43 by an upper punch (not shown) (see FIG. 6). . As a result, the dimension of the sintered body of the clutch hub 22 is corrected by the sizing die 41, and the clutch hub 22 having the final shape is manufactured.

  In the present embodiment, after sintering the clutch hub 22 having a plurality of key grooves 37 formed on the outer peripheral portion, in the sizing process, the fitting hole 43 having the circular inner peripheral portion 42 and the inner peripheral portion 42 are used. A sizing die 41 is used which includes a plurality of protrusions 45 projecting inward in the radial direction and in which the curved surface of the inner peripheral portion 42 is formed so that the inner diameter of the inner peripheral portion 42 increases toward the protrusion 45. Since the key groove 37 of the sintered body of the clutch hub 22 is aligned with the protrusion 45 and the clutch hub 22 is press-fitted into the fitting hole 43 to correct the size, the inner peripheral portion 42 of the fitting hole 43 is obtained. The thick portion 47 can be corrected to a perfect circle by the curved surface.

  That is, the curved surface of the inner peripheral portion 42 has the smallest inner diameter at the substantially central portion in the circumferential direction of the root circle 46 of the inner tooth 44 connecting the projecting direction center line 45a of the protruding portion 45, and protrudes from the central portion in the circumferential direction. The thick portion 47 is formed between the key groove 37 and the key groove 37, whereas the inner root 44 is curved so that the inner diameter of the root circle 46 increases toward the center line in the protruding direction of the portion 45. The outer diameter of the substantially central portion in the circumferential direction is the largest, and the outer diameter decreases toward the central axis of the key groove 37.

  For this reason, the thick portion 47 can be corrected to a perfect circle by fitting the outer peripheral portion of the thick portion 47 to the curved surface of the inner peripheral portion 42 of the sizing mold 41.

  In this embodiment, since the roundness of the clutch hub 22 can be increased in this way, the accuracy of effective meshing between the hub spline 22b of the clutch hub 22 and the sleeve spline 34a of the sleeve 34 can be improved.

  For this reason, the pulling force between the hub spline 22b of the clutch hub 22 and the sleeve spline 34a of the sleeve 34 can be reduced, and the sleeve 34 is pulled out of the clutch hub 22 due to vibration or the like, so-called gear slippage (shift slippage). ) Can be prevented.

  Further, in the present embodiment, since the outer peripheral portion of the clutch hub 22 can be corrected to a perfect circle by using a sizing die 41 in which the shape of the inner peripheral portion 42 of the fitting hole 43 is devised, an expensive material is used. The clutch hub 22 can be manufactured without using it, and the manufacturing cost of the clutch hub 22 can be prevented from increasing.

  In the present embodiment, since the sintering process is adopted as the heat treatment process of the clutch hub 22, the sizing die 41 is fixed even when the roundness of the clutch hub 22 is reduced in the sintering process. By using and correcting the dimension of the clutch hub 22, the outer peripheral portion of the clutch hub 22 can be corrected to a perfect circle. For this reason, the manufacturing cost of the clutch hub 22 can be reduced and the high strength clutch hub 22 can be obtained without impairing the advantage of sintering.

  In this embodiment, the clutch hub 22 is preformed by sintering. However, the heat treatment is not limited to sintering as long as the heat treatment is performed.

  The embodiment disclosed this time is illustrative in all respects and is not limited to this embodiment. The scope of the present invention is shown not by the above description of the embodiments but by the scope of the claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of the claims.

  As described above, the disk member manufacturing method and the sizing mold according to the present invention can be obtained by using the sizing mold even when the roundness of the disk member is reduced by the heat treatment. It has the effect of providing a manufacturing method and a sizing mold for a disk member that can be corrected to a perfect circle and can improve the roundness of the disk member. This is useful as a manufacturing method of a disk member, a sizing mold, and the like in which a disk member having a groove is molded and then the dimension of the disk member is corrected by a sizing mold.

22 Clutch hub (disc member)
37 Keyway (outer groove)
41 Sizing mold 42 Inner circumference 43 Fitting hole 44 Inner tooth 45 Projection 45a Projection direction center line

Claims (5)

A heat treatment step of forming, by heat treatment, a disk member having at least one outer peripheral groove formed on the outer periphery;
Including a fitting hole having a circular inner peripheral portion and at least one protrusion protruding radially inward from the inner peripheral portion, and the inner diameter of the inner peripheral portion increases toward the protrusion. Using a sizing mold in which the curved surface of the inner peripheral portion is formed, and a sizing step of aligning the outer peripheral groove with the protrusion and press-fitting the disc member into the fitting hole. A manufacturing method of a disk member.   In the heat treatment step, external teeth are formed on the outer peripheral portion of the disc member, and in the sizing step, the disc member is fitted using a sizing mold in which internal teeth are formed on the circular inner peripheral portion. The method of manufacturing a disk member according to claim 1, wherein a clutch hub is manufactured as a disk member by press-fitting into the joint hole.   The said heat processing process is a sintering process, The manufacturing method of the disk member of Claim 1 or Claim 2 characterized by the above-mentioned. A sizing mold used in the method for manufacturing a disk member according to any one of claims 1 to 3,
Including a fitting hole having a circular inner peripheral portion and at least one protrusion protruding radially inward from the inner peripheral portion, and the inner diameter of the inner peripheral portion increases toward the protrusion. A sizing mold characterized in that the curved surface of the inner periphery is formed.   A plurality of protrusions spaced apart in the circumferential direction of the inner peripheral part, and the inner diameter of the substantially circumferential central part of the inner peripheral part connecting the projecting direction center lines of the protrusions is the smallest, the circumference 5. The sizing mold according to claim 4, wherein the sizing mold is curved so that the inner diameter increases from the center in the direction toward the center line in the protruding direction of the protrusion.

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