JP5428183B2 - Method and apparatus for forming cylindrical clutch component - Google Patents

Description

  The present invention relates to a molding technique for cylindrical clutch components such as a clutch drum and a clutch hub incorporated in an automatic transmission.

  For clutch parts such as clutch drums and clutch hubs incorporated in an automatic transmission of an automobile, a multi-plate clutch is spline-fitted to the inner peripheral surface (in the case of a clutch drum) or outer peripheral surface (in the case of a clutch hub). Spline grooves are formed.

For example, in Patent Document 1, a hollow cylindrical workpiece is mounted on the outer peripheral portion of a mandrel having a plurality of tooth shapes formed in a gear shape along the axial direction, and the outer peripheral portion of the mandrel and the cross section of the rolling roller are formed. The workpiece and mandrel are moved relative to the rolling roller in the axial direction and circumferential direction (direction rotating around the axis) while pressing the cylindrical outer peripheral surface of the workpiece between the single tooth-shaped projections. A technique for forming a plurality of tooth profiles on a cylindrical outer peripheral surface is described.
Japanese Patent No. 3709712

  When the workpiece is pressed by a mandrel and a rolling roller as in Patent Document 1 above, the material on the cylindrical outer peripheral surface of the workpiece flows in the axial direction and the circumferential direction. It deform | transforms so that it may expand in a direction and a circumferential direction. Conventionally, the amount of extension of the workpiece in the circumferential direction is predicted in advance by a test or the like, and the tooth profile of the mandrel is determined in consideration of the predicted amount of extension. However, if the circumferential extension is larger than expected, the tooth profile will deviate from the target, and the required dimensions cannot be obtained. In addition, the amount of material flow during molding increases as the processing speed increases (that is, the processing range increases because the amount of rolling rollers and mandrels fed to the workpiece material per unit processing increases). There was a limit to increasing the processing speed in order to minimize deformation.

  The present invention has been made in view of the above-mentioned problems, and the object thereof is to suppress deformation of the material as compared with the prior art even when the processing speed of the clutch parts is increased, and to achieve both improvement in production efficiency and improvement in processing accuracy. It is to realize the technology that can do.

In order to solve the above-described problems and achieve the object, the first embodiment according to the present invention is engaged with a clutch disk by pressing a cylindrical portion of a sheet metal workpiece with a mandrel and two rolling rollers. In the method of forming a cylindrical clutch component having a plurality of splines formed thereon, a step of setting the workpiece on the mandrel having a plurality of tooth shapes on an outer peripheral portion along an axial direction, and a central portion for forming the splines And the two protrusions provided on both sides of the tooth portion, the two cylindrical portions facing each other across the tubular portion in the radial direction outside the tubular portion of the workpiece. By pressing the cylindrical portion of the workpiece while pressing the rolling roller and the mandrel on which the workpiece is set while relatively moving in the axial direction and the rotation direction of the workpiece. Forming the spline while restricting the flow of the material in the direction by the protrusions, and in the step of forming the spline, provided on the teeth of each rolling roller and on both sides of the teeth Due to the protrusions formed, only two concave portions and one convex portion are formed in the spline in the cylindrical portion of the workpiece for each processing unit.

Further, according to a second aspect of the present invention, a cylindrical clutch component in which a plurality of splines that engage with a clutch disk are formed by pressing a cylindrical portion of a sheet metal workpiece with a mandrel and two rolling rollers. In the molding apparatus, the mandrel has a plurality of teeth on the outer periphery along the axial direction, and the workpiece is set in the axial direction and the rotational direction of the two rolling rollers with respect to the two rolling rollers. The two rolling rollers are opposed to each other on the outside of the cylindrical portion of the workpiece with the cylindrical portion sandwiched in the radial direction, and at the center portion to form the spline, respectively. A tooth portion that is provided, and a protrusion that is provided on a side portion of the tooth portion to restrict the flow of the material in the circumferential direction by pressing the workpiece, and the tooth portion of each rolling roller and the Tooth sides The projections provided on, for each processing unit, only two recesses and one convex portion is formed in the spline in the cylindrical portion of the workpiece.

  According to these forms, by providing the protrusions that restrict the flow of the workpiece material in the circumferential direction on both sides in the circumferential direction of the teeth of the rolling roller, the processing speed (that is, the rolling roller and the mandrel) Even if the feed amount is increased, deformation of the workpiece in the diameter expansion direction can be suppressed.

  According to the present invention, even if the processing speed of the clutch parts is increased, the deformation of the material can be suppressed as compared with the conventional one, and both the improvement of the production efficiency and the improvement of the processing accuracy can be achieved.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  The embodiment described below is an example as means for realizing the present invention, and the present invention can be applied to a modified or modified embodiment described below without departing from the spirit of the present invention.

[Configuration of cylindrical clutch parts]
FIG. 1 is a perspective view of a clutch drum applied as a cylindrical clutch component of the present invention.

  As shown in FIG. 1, the clutch drum 10 is made of sheet metal and has a bottomed cylindrical shape, and a shaft hole 12 through which a shaft member is passed is provided at the bottom. A spline groove 11 extending in the axial direction is formed in the cylindrical portion (cylindrical peripheral surface portion) of the clutch drum 10. The spline groove 11 is composed of 32 concave portions 11a and convex portions 11b (as viewed from the outer peripheral side) arranged alternately.

  A total of 16 pairs of oil holes 13 penetrating in the radial direction are formed in the convex portion 11 b of the spline groove 11. The oil holes 13 are provided in every other 32 protrusions 11b. The oil hole 13 has an effect of improving lubricity and cooling performance of the clutch and its peripheral members by passing ATF (automatic transmission oil) through the oil hole 13.

  In the axial direction of the clutch drum 10, a snap ring groove 14 into which the snap ring is inserted is formed between the open end 15 of the cylindrical portion and the oil hole 13. The snap ring groove 14 is provided over the entire circumference of the spline groove 11. However, since the groove depth does not reach the convex portion 11b, the groove forming process is actually performed on the concave portion as shown in the figure. 11a.

  Next, the manufacturing method and manufacturing apparatus of the clutch drum 10 of FIG. 1 will be described.

  FIG. 2 is a schematic view showing a manufacturing process of the clutch drum shown in FIG.

  First, in the press forming step of FIG. 2A, a single metal plate is punched and drawn by a not-shown pressing device, and the metal plate is formed into a cylindrical shape. That is, a bottomed cylindrical shape and a shaft hole 12 which are basic shapes of the clutch drum 10 are formed (hereinafter referred to as a press-formed work W1). The axial length of the cylindrical portion in this press-formed workpiece is shorter than the completed dimension, and the cylindrical portion has an excessive plate thickness.

  Next, in the spline forming step of FIG. 2B, spline grooves 11 are formed in the cylindrical portion of the work W1 (hereinafter, spline forming work W2). The spline forming apparatus 20 includes a mandrel 21 having a gear-shaped outer peripheral portion 21a formed with a plurality of tooth shapes (corresponding to the spline grooves 11) along the axial direction, and a protrusion having a tooth profile having a trapezoidal cross section described later in FIG. A rolling roller 22 having a portion formed thereon. The rolling roller 22 is rotatably supported by the rotary head 23 and can rotate in the r1 direction so as to rotate about the rotation axis of the roller, and the rotation of the rotary head 23 causes the mandrel 21 to rotate. Then, while repeating the approach and separation, it can rotate in the r2 direction so as to revolve around the rotation axis 23a of the rotary head 23 along the axial direction of the mandrel 21. Further, two rolling rollers 22 are supported by one rotating head 23, and a pair (that is, two) of the rotating heads 23 are arranged in the vertical direction or the horizontal direction with respect to the mandrel 21, and are mutually connected. It can rotate in the opposite direction.

  When performing spline forming, first, (1) the inner peripheral portion of the press-formed work W1 is mounted on the outer peripheral portion 21a of the mandrel 21 and fixed by the fixture 24, and (2) the rolling roller 22 is then rotated. The outer peripheral surface of the work W1 is pressed between the outer peripheral portion 21a of the mandrel 21 and the protruding portion of the rolling roller 22 while synchronizing the period and the feed amount and feed speed of the mandrel 21 in the axial direction d1 and the circumferential direction d2. By doing so, the spline groove 11 is formed. Here, the feed amount in the axial direction d1 of the mandrel 21 for each processing (that is, the length with which the rolling roller 22 presses the workpiece W1) is the value when the entire length of the spline groove 11 is divided into several parts. Since it corresponds to a unit length and there is a pair of rotary heads 23, the spline groove 11 is formed in the axial direction by the unit length each time the workpiece W1 is rotated halfway.

  Next, in the trimming process of FIG. 2 (c), the oil hole 13 and the snap ring groove 14 are drilled in the cylindrical portion of the spline-formed workpiece W2 by a trimming apparatus described later with reference to FIG. A portion of the end portion 15 other than the effective range is cut. That is, in the spline forming step, since the workpiece W2 is deformed so as to expand in the axial direction and the circumferential direction, unnecessary portions extending in the axial direction are cut out by trimming. Note that the amount of extension of the workpiece W2 in the circumferential direction is predicted in advance by a test or the like, and the tooth profile of the mandrel 21 is determined in consideration of the predicted amount of extension.

  Trimming is performed by the die part 30 and the punch part 40. As illustrated in FIG. 3, the trimming apparatus 70 includes an index table 60 that fixes and rotates the die part 30, the punch part 40, the drive mechanism 50, and the workpiece W <b> 2. The drive mechanism 50 includes a first hydraulic cylinder 51 and a second hydraulic cylinder 53 whose axial centers overlap in plan view. A rod 52 is connected to the first hydraulic cylinder 51, and a rod 54 is connected to the second hydraulic cylinder 53. The die 52 is connected to the rod 52, and the punch 40 is connected to the rod 54.

  The first hydraulic cylinder 51 moves the rod 52 toward the axis of the workpiece W2 (in the direction of the arrow s1). And the die part 30 receives the applied pressure received from the punch part 40. On the other hand, the second hydraulic cylinder 53 moves the rod 54 in a direction away from the axis of the workpiece W2 (arrow s2 direction). Then, the workpiece W2 is pressed from the inner peripheral side by the punch portion 40 and processed.

  The die part 30 has a die 31 fitted to the outer peripheral side of the spline groove 11 of the workpiece W2. The punch unit 40 includes punches 41 to 43 and a guide 44 that supports the punches 41 to 43. The punches 41 and 42 are in contact with and penetrate the concave portion 11a of the spline groove 11 of the workpiece W2 from the inner peripheral side to form an oil hole. At this time, the die 31 of the die portion 30 contacts the spline groove 11 of the workpiece W2 from the outer peripheral side and receives a load from the punches 41 and 42.

  Further, the punch 43 abuts and presses the opening end 15 of the workpiece W2 from the inner peripheral side to cut unnecessary portions. At this time, the die 31 of the die part 30 is fitted to the spline groove 11 of the workpiece W2 on the outer peripheral side and cooperates with the punch 43 to apply a shearing force to the outer peripheral surface of the workpiece W2.

  With the above configuration, a part of the workpiece W2 in the circumferential direction (for example, two portions of the spline groove 11) is machined (hereinafter, a machining unit) by one machining (one stroke of the rod 54). The trimming apparatus rotates the index table 60 on which the workpiece W2 is placed, and processes the entire circumference (32 mountains) by a total of 16 machining units while shifting by two mountains of the spline groove 11 per machining unit. Do.

[Shaping roller shape]
Here, the shape of the rolling roller for carrying out the spline forming of FIG. 2B will be described.

  FIG. 4 is a view showing a tooth profile of a rolling roller according to the present invention in comparison with a conventional tooth profile.

  In the conventional rolling roller 22A shown in FIG. 4A, when the workpiece W1 is pressed by the tooth portion 22a and the plate thickness of the cylindrical portion decreases, the pressed workpiece material flows in the axial direction and the circumferential direction. Then, the cylindrical portion of the workpiece W1 is deformed so as to expand in the circumferential direction.

  On the other hand, as shown in FIGS. 4B to 4D, the workpiece material is forced to flow in the circumferential direction on both sides in the circumferential direction of the tooth portions 22b to 22d of the rolling rollers 22B to 22D. A pair of protrusions 22b3 to 22d3 to be regulated are provided. 4 (b) and 4 (c) show the tooth profile of the rolling roller according to the reference embodiment different from the present invention, and FIG. 4 (d) shows the tooth profile of the rolling roller according to the embodiment of the present invention. Show. Here, in the case of FIGS. 4B and 4C, the tooth portions 22b and 22c are composed of central convex-shaped portions 22b1 and 22c1 and concave-shaped portions 22b2 and 22c2 on both sides, and one concave portion 11a and its concave portion 11a. It is defined as a shape portion for forming the convex portions 11b on both sides. In the case of FIG. 4D, the tooth portion 22d is defined as a shape portion that includes a central concave shape portion 22d1 and forms one convex portion 11b. Thereby, since the flow of the workpiece material in the circumferential direction is restricted and flows in the axial direction, deformation of the workpiece can be suppressed even if the machining speed is increased. Specifically, the expansion in the circumferential direction can be suppressed to a maximum of 0.1 mm, and the deformation in the expansion direction can be suppressed even when the processing speed is increased five times.

  In the configuration of FIG. 4B, the protrusions 22b3 on both sides of the tooth portion 22b have the same shape as the tooth portions 22b1 and 22b2, and three recesses 11a and two protrusions 11b are formed for each processing unit. it can.

  In the configuration of FIG. 4C, the protrusions 22c3 on both sides of the tooth portion 22c are not made the same shape as the tooth portions 22c1 and 22c2, but at least in front of the center tooth portion 22c1 (the rotation direction d2 of the workpiece). The protruding portion 22c3 ′ on the opposite side of the shape is curved with a protruding height smaller than that of the tooth portion 22c1. According to this shape, after preliminary processing into a rough shape by the curved surface of the protrusion 22c3 ′ in front of the tooth portion 22c1, the tooth portions 22c1, 22c2 while suppressing the flow of the material in the circumferential direction at the protrusion 22c3 ′. Can be finished to the final shape.

  Here, in the configuration of FIG. 4B, when the workpiece W1 is fed with one spline groove 11 as a processing unit, the concave portion 11a and the convex portion 11b formed by the front protrusion 22b3 ′ are the tooth portions 22b1, 22b2. 4 and the other protrusion 22b3 "beyond that, it is used again for molding, resulting in an increase in unnecessary steps, for example, causing indentation. 4B, in other words, in the configuration shown in FIG. 4B, if the feed amount of the workpiece W1 is set for each of the three concave portions 11a and the two convex portions 11b, the above-described problem occurs. Such inconvenience disappears.

  4 (b) and 4 (c), it is sufficient that the protrusions 22b3 and 22c3 can prevent the material from flowing from the tooth side toward the protrusions on both sides. As shown by the broken line, instead of the configuration in which the protrusions 22c3 are provided on both sides of the tooth portions 22c1 and 22c2, a part of both end portions of the tooth portion (concave portion) 22c2 is directed toward the inner diameter direction of the workpiece W1. It is good also as a structure which extended and formed the wall part 22c4 about 1/2 of the board thickness of the recessed part 11a.

  4D, the protrusions 22d3 on both sides of the tooth portion 22d1 have the same shape as the tooth portion 22d1, and two recesses 11a and one protrusion 11b can be formed for each processing unit.

  FIG. 5 illustrates another reference form of the rolling roller. As shown in (e) and (f), a workpiece material is provided on one side in the circumferential direction of the tooth portions 22e and 22f of the rolling rollers 22E and 22F. Protrusions 22e3 to 22f3 that forcibly restrict the flow in the circumferential direction are provided.

  Here, in the configuration of FIG. 5E, the tooth portion 22e is composed of a central convex shape portion 22e1 and a side concave shape portion 22e2, and is defined as a shape portion for forming the concave portion 11a and the convex portion 11b. To do. The protrusion 22e3 provided on the opposite side of the workpiece rotation direction d2 restricts the flow of the workpiece material in the circumferential direction (on the opposite side of the workpiece rotation direction d2), so that the workpiece can be deformed even if the machining speed is increased. It has a suppressing effect.

  Further, in the configuration of FIG. 5 (f), the tooth portion 22f includes a central convex shape portion 22f1 and a side concave shape portion 22f2, and is defined as a shape portion for forming the concave portion 11a and the convex portion 11b. . The protrusion 22f3 provided in the rotation direction d2 of the workpiece restricts the flow of the workpiece material in the circumferential direction (the rotation direction d2 of the workpiece), and has an effect of suppressing deformation of the workpiece even when the processing speed is increased.

  In the present embodiment, the clutch drum 10 in which the multi-plate clutch is spline-fitted to the inner peripheral surface as an example of the cylindrical clutch component has been described as an example. Even applicable. Further, the present invention is not limited to the clutch component of the automatic transmission, but can be applied to a clutch component having a similar mechanism.

It is a perspective view of a clutch drum applied as a cylindrical clutch component of the present invention. It is the schematic which shows the manufacturing process of the clutch drum shown in FIG. FIG. 3 is a plan view of the trimming apparatus of FIG. 2. The figure which shows the tooth profile (FIG.4 (d)) of the rolling roller based on this invention compared with the conventional tooth profile (FIG.4 (a) and the tooth profile which concerns on a reference form (FIG.4 (b) and (c))). It is. It is a figure which illustrates the other reference form of a rolling roller.

10 Clutch drum 11 Spline groove 12 Shaft hole 13 Oil hole 14 Snap ring groove 15 Open end 21 Mandrel 22, 22A-22F Rolling roller 23 Rotating head 24 Fixing tool 30 Die part 31 Die 40 Punch part 41, 42 Punch 50 Drive Mechanism 51 First hydraulic cylinder 53 Second hydraulic cylinder 52, 54 Rod 60 Index table W1, W2 Workpiece

Claims (2)

In a method for forming a cylindrical clutch component in which a plurality of splines that engage with a clutch disk are formed by pressing a cylindrical portion of a sheet metal workpiece with a mandrel and two rolling rollers,
Setting the workpiece on the mandrel having a plurality of teeth on the outer periphery along the axial direction;
A tooth portion provided at a central portion for forming the spline, and protrusions provided on both side portions of the tooth portion; and the cylindrical portion is formed on the outside of the cylindrical portion of the workpiece. While pressing the cylindrical portion of the workpiece while relatively moving the two rolling rollers facing each other in the direction and the mandrel on which the workpiece is set in the axial direction and the rotation direction of the workpiece, Forming the spline while regulating the flow of the material in the circumferential direction by pressing the workpiece by the protrusion, and
In the step of forming the spline, by the projections provided on both sides of the teeth and the teeth of the rolling rollers, each processing unit, two recesses and at the spline cylindrical portion of the workpiece A molding method characterized by forming only one convex portion. In a cylindrical clutch component molding apparatus in which a plurality of splines that engage with a clutch disk are formed by pressing a cylindrical portion of a sheet metal workpiece with a mandrel and two rolling rollers.
The mandrel has a plurality of teeth on the outer periphery along the axial direction, and is movable relative to the two rolling rollers in the axial direction and the rotation direction of the workpiece with the workpiece set. ,
The two rolling rollers are opposed to each other on the outside of the cylindrical portion of the workpiece with the cylindrical portion sandwiched in the radial direction, and tooth portions provided at the center portion for forming the spline, respectively. A protrusion that is provided on both sides of the tooth portion and regulates the flow of the material in the circumferential direction by pressing the workpiece,
By the projections provided on both sides of the teeth and the teeth of the rolling rollers, each processing unit, in the spline cylindrical portion of the workpiece only two recesses and one convex portion is formed A molding apparatus characterized by that.

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