JP2006272452A - Press forming method and device for disk shaped stock - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a forming method for a disk shaped stock where trimming for the outer circumference of a disk shaped stock is not needed, and strain and wrinkles are not generated upon drawing for forming an annular projecting part. <P>SOLUTION: Since, to the inner circumferential part of a disk shaped stock 12 in which a tapered outer circumferential part 16 is beforehand formed in a tapered outer circumferential part forming stage 20, and whose tension is increased, an annular projecting part 10 is drawn in an annular projecting part forming stage 22, tension is generated between the tapered outer circumferential part 16 and the annular projecting part 10, and the stock is made hard to flow to the inner circumferential side, thus strain and wrinkles are not generated upon drawing for forming the annular projecting part 10. Further, since the tapered outer circumferential part 16 formed on the outer circumferential part of the disk shaped stock 12 is usable as being the size as it is, trimming for removing a flange part preliminarily bent to the outer circumferential part for beforehand imparting tension to the inner circumferential part of the disk shaped stock 12 is not needed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method of forming a disk-shaped material provided with an annular protrusion on an inner peripheral portion, and an apparatus for forming the disk-shaped material.

As exemplified by a material of a drive plate fixed to an end portion of an engine crankshaft, a disk-shaped material having an annular convex portion on an inner peripheral portion is known. The annular convex part provided in the inner peripheral part of this disk-shaped raw material is formed by drawing which is a kind of press work. For example, the disk-shaped material described in Patent Document 1 and Patent Document 2 is that.
JP 2004-358475 A JP 2004-358476 A

  By the way, in the conventional disk-shaped material, since distortion and deformation occur at the time of drawing processing, in order to prevent it, a flange portion protruding in the axial direction is preliminarily molded on its outer peripheral portion by plastic working, and then It is conceivable to form an annular convex portion on the inner peripheral portion by drawing. According to this, at the time of drawing, high tension is generated in the inner peripheral portion, and the material hardly flows to the inner peripheral portion, so that it is expected that generation of distortion and wrinkles is suitably suppressed.

  However, since the flange portion formed on the outer peripheral portion of the disk-shaped material needs to be removed and discarded by trimming prior to increasing the thickness of the outer peripheral portion of the disk-shaped material, the material yield Is expected to be an obstacle to lowering the price of parts.

  On the other hand, if the annular protrusion is drawn on the inner peripheral portion of the disk-shaped material without providing the flange portion on the outer peripheral portion of the disk-shaped material in order to increase the material yield, the material is not sufficiently tensioned. Therefore, it is inevitable that the material is pulled by the drawing process to cause distortion and wrinkles.

  The present invention has been made against the background of the above circumstances, and the object thereof is that it does not require trimming of the outer periphery of the disk-shaped material, and distortion and wrinkles are generated during drawing for forming the annular convex portion. An object of the present invention is to provide a method and apparatus for forming a disc-shaped material that does not occur.

  The subject of the press-forming method of the disk-shaped material of the invention according to claim 1 for achieving this object is a press-forming method of the disk-shaped material provided with an annular convex portion on the inner peripheral portion, (a) a tapered outer periphery forming step of press-molding a tapered outer peripheral portion inclined at a predetermined taper angle on the outer peripheral portion of the disc-shaped material, and (b) a tapered outer peripheral portion by the tapered outer peripheral portion forming step. Is formed at the same time as or after being formed, and includes an annular protrusion forming step of drawing the annular protrusion on the inner peripheral portion of the disk-shaped material.

  Moreover, the gist of the invention according to claim 2 is that, in the invention according to claim 1, (a) the tapered outer peripheral portion of the disc-shaped material is a thickness increasing step after the annular convex portion forming step. (B) The tapered outer periphery of the disk-shaped material is an angle corresponding to the cross-sectional shape of the forming groove of the thickening roller used in the thickening process. It is what has.

  The gist of the invention according to claim 3 is that, in the invention according to claim 1 or 2, (a) the tapered outer peripheral portion forming step has a first tapered surface on the outer peripheral portion and an inner peripheral portion. A first mold having a first aperture surface at a portion thereof, and a second mold having a second tapered surface corresponding to the first tapered surface and facing the outer peripheral portion of the first mold. The taper-shaped outer peripheral portion is formed between the first taper surface and the second taper surface by relatively approaching each other, and (b) the step of forming the annular convex portion includes the first gold The mold has a second diaphragm surface corresponding to the first diaphragm surface of the first mold, and is opposed to the inner peripheral portion of the first mold and provided on the inner peripheral side of the second mold. By making the third mold relatively approach, the annular convex portion is formed between the first diaphragm surface and the second diaphragm surface.

  The gist of the press molding apparatus of the invention according to claim 4 for suitably carrying out the method invention is a press molding apparatus for press-molding a disk-shaped material having an annular convex portion on an inner peripheral portion. (A) a first mold having a first tapered surface on the outer periphery and a first diaphragm surface on the inner periphery; and (b) a second taper surface corresponding to the first taper surface. A second mold provided opposite to the outer periphery of the first mold; and (c) a second diaphragm surface corresponding to the first diaphragm surface, and an inner periphery of the first mold. A third mold disposed opposite to the inner periphery of the second mold, and (d) press-molding a tapered outer peripheral portion inclined at a predetermined taper angle on the outer peripheral portion of the disk-shaped material. And (e) an inner peripheral portion of the disk-shaped material on which the tapered outer peripheral portion is formed, and a first driving device that moves the second die relatively closer to the first die. To draw forming the convex portion, and a second driving unit for relatively closer to the third mold against the first mold is to contain.

  According to the press forming method of the disk-shaped material of the invention according to claim 1, the annular convex portion is squeezed with respect to the inner peripheral portion of the disk-shaped material simultaneously with or after the tapered outer peripheral portion is formed. Since the molding is performed, tension is generated between the tapered outer peripheral portion and the inner peripheral portion during the drawing process for forming the annular convex portion, and the material hardly flows to the inner peripheral portion, so that distortion and wrinkle do not occur. In addition, since the tapered outer peripheral portion formed on the outer peripheral portion of the disk-shaped material can be used as it is or after being deformed, the outer peripheral edge portion is used to apply tension to the inner peripheral portion of the disk-shaped material in advance. No trimming is required to remove the pre-bent flange.

  Moreover, according to the invention which concerns on Claim 2, the taper-shaped outer peripheral part of the said disk-shaped raw material is thickened using a thickening roller in the thickening process after the said annular convex part formation process. The taper-shaped outer peripheral portion of the disk-shaped material has an angle corresponding to the cross-sectional shape of the forming groove of the thickening roller used in the thickening process, so that reworking to the tapered outer peripheral portion is unnecessary. There are advantages.

  According to the invention of claim 3, the tapered outer peripheral portion forming step includes a first mold having a first tapered surface on the outer peripheral portion and a first drawn surface on the inner peripheral portion, and a first mold thereof. By bringing the second taper surface corresponding to the first taper surface relatively close to the second mold provided facing the outer peripheral portion of the first mold, the first taper surface and the first taper surface The taper-shaped outer peripheral portion is formed between two tapered surfaces, and the annular convex portion forming step includes a second diaphragm corresponding to the first mold and a first diaphragm surface of the first mold. A first diaphragm surface having a surface opposed to the inner peripheral portion of the first mold and relatively close to a third mold provided on the inner peripheral side of the second mold. Since the annular convex portion is formed between the first diaphragm surface and the second diaphragm surface, it is not necessary to convey between the processes, and the above-mentioned is performed at one processing place. There is the advantage that over-Pas-shaped outer peripheral portion forming process and the annular convex portion forming step is performed.

  The invention according to claim 4 is a press molding apparatus for press-molding a disk-shaped material having an annular convex portion on the inner peripheral portion, and (a) has a first tapered surface on the outer peripheral portion, and A first mold having a first diaphragm surface on the inner periphery, and (b) a second taper surface corresponding to the first taper surface and provided opposite to the outer periphery of the first mold. A second mold, and (c) a second diaphragm surface corresponding to the first diaphragm surface, facing the inner periphery of the first mold and provided on the inner periphery side of the second mold. A third mold, and (d) the second mold with respect to the first mold in order to press-mold a tapered outer peripheral portion inclined at a predetermined taper angle on the outer peripheral portion of the disk-shaped material. A first driving device for relatively approaching the first mold, and (e) with respect to the first mold, in order to draw an annular convex portion on the inner peripheral portion of the disk-shaped material on which the tapered outer peripheral portion is formed. The first Since it includes the second drive device that relatively moves the mold, the taper outer peripheral portion forming step and the annular convex portion forming step are performed at one processing place without the need for conveyance between steps. There are advantages.

  Here, the disk-shaped material is preferably used as a material for manufacturing a drive plate of an automobile having a thick part for forming a tooth part on the outer peripheral part, but for increasing rigidity, etc. It can be used as a material for various other applications that require an annular protrusion on the inner periphery.

  The annular convex portion has various shapes such as a convex portion protruding in a rib shape and a stepped convex portion to increase rigidity. In short, any shape that is formed by drawing and protrudes to one side may be used. Moreover, this annular convex part may be formed not only in a single layer but also in a double or triple concentric shape. Further, the annular convex portion may not be completely annular, and may be intermittently connected in the circumferential direction.

  The taper-shaped outer peripheral portion forming step only needs to form a tapered outer peripheral portion that is inclined at various angles of taper in order to obtain a tension that suppresses the occurrence of distortion and wrinkles during drawing. If the taper angle is too large during post-processing, a step of reducing the taper angle may be provided.

  In the case of increasing the thickness of the outer peripheral portion of the disk-shaped material, it may be possible to increase the thickness in one step using a single first rotating roller, but in a plurality of steps using a plurality of types of rotating rollers. It may be one that is thickened. Further, the thickening molding may be performed in a plurality of steps. For example, after the thickness increase molding in the first thickness increase molding step, the thickness may be further increased in the second thickness increase molding step similar to the first thickness increase molding step.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a front view showing a disc-shaped material 12 having an annular convex portion 10 on the inner peripheral portion, with half of the disc-shaped material 12 omitted, and FIG. It is sectional drawing for showing.

  As shown in FIG. 1 and FIG. 2, the disk-shaped material 12 includes a center hole 14 formed through the central portion, an annular convex portion 10 formed in the inner peripheral portion by drawing, and press processing. And a tapered outer peripheral portion 16 having a predetermined taper angle θt formed on the outer peripheral portion. The tapered outer peripheral portion 16 has a predetermined inclination angle θi of, for example, about 20 degrees with respect to the surface of the disk-shaped material 12, and the half of the taper angle θt and the inclination angle θi are in a relationship of an additional angle. is there. The disk-shaped material 12 configured as described above is formed at the shaft end of the crankshaft of the engine by forming outer peripheral teeth by rolling after, for example, increasing the thickness of the tapered outer peripheral portion 16. The drive plate 32 is fixed.

  FIG. 3 is a process diagram for explaining the main part of the manufacturing process of the drive plate 32. In FIG. 3, in the tapered outer peripheral portion forming step (press forming step) 20, the tapered outer peripheral portion 16 is formed by pressing the outer peripheral portion of the steel disk 18 having the center hole 14. Next, in the annular convex portion forming step (drawing step) 22, the annular convex portion 10 is formed by drawing the inner peripheral portion of the steel disk 18 in which the tapered outer peripheral portion 16 is previously formed on the outer peripheral portion. Thus, the disk-shaped material 12 shown in FIGS. 1 and 2 is manufactured from the steel disk 18. In the first thickening step 24, the tapered outer peripheral portion 16 of the disk-shaped material 12 is thickened using the first thickening roller 62 as shown in FIG. In the second thickening step 26, the thickened tapered outer peripheral portion 16 of the disk-shaped material 12 is further thickened using a second thickening roller (not shown) as shown in FIG. It is said. And in the rolling process 28, the outer peripheral tooth | gear 30 is formed in the outer peripheral surface of the disk-shaped raw material 12 using the rolling roller which is not shown in figure, and the drive plate 32 is formed by performing an appropriate finishing.

  FIG. 7 is a diagram for explaining a main part of the press device 36 for executing the tapered outer peripheral portion forming step 20 and the annular convex portion forming step 22 at one place and in one operation cycle. In the press device 36 shown in FIG. 7, the right half is omitted because it is a right and left object.

  The pressing device 36 is movable in the approaching / separating direction, that is, in the vertical direction, by a fixed base plate 38 and a ram 40 positioned above the base plate 38 and functioning as a driving device for the first mold 44. A plate 42, an upper die fixed to the movable plate 42, that is, a first die 44, and a base plate 38 fixed via a spacer 46 and a mounting plate 48, and an inner peripheral portion of the first die 44 And a plurality of hydraulic pressures that are disposed on the outer peripheral side of the third mold 50 so as to face the outer peripheral portion of the first mold 44 and function as a driving device for the second mold 54. An annular second mold 54 driven in an approaching / separating direction, that is, an up / down direction with respect to the first mold 44 by the actuator 52, and projecting upward from the center of the third mold 50, that is, toward the first mold 44. Steel A positioning pin 56 is provided for fitting into the disk 18 or the center hole 14 of the disk-shaped material 12 and centering it, and is sequentially operated according to a program (procedure) stored in advance by a control device (not shown). . The output rods 58 of the plurality of hydraulic actuators 52 are connected to each other by a synchronization plate 60.

  The first mold 44 has, for example, an inclined surface 44a that is a first tapered surface formed on an outer peripheral portion thereof so as to be inclined at an angle of about 20 degrees, a flat surface 44b formed on the inside thereof, an annular convex In order to form the portion 10, an annular concave groove 44 c that is a first diaphragm surface formed on the outer peripheral portion of the flat surface 44 b and a fitting hole 44 d formed in the center of the flat surface 44 b are provided. The second mold 54 is disposed on the inner peripheral side of the inclined surface 54a and the outer periphery of the flat surface 44b. The inclined surface 54a is a second tapered surface that faces the inclined surface 44a and is inclined at the same angle. And a flat surface 54b facing the part. The third mold 50 is provided on the outer peripheral portion of the flat surface 50a so as to be placed in the groove 44c to form the flat surface 50a facing the inner peripheral portion of the flat surface 44b and the annular convex portion 10. And an annular ridge 50b which is the second diaphragm surface. The inclined surface 44a and the inclined surface 54a, the flat surface 44b, the flat surface 54b, and the flat surface 50a are provided so as to be parallel to each other.

  FIG. 7 shows a standby state in which the first mold 44 is separated from the third mold 50 and opened between them, and the second mold 54 is raised. However, the 2nd metal mold | die 54 does not necessarily need to be in a raise position, and may be raised after starting. In this state, the steel disk 18 is placed on the second mold 54 prior to the tapered outer peripheral portion forming step 20 and the annular convex portion forming step 22, and the positioning pin 56 is fitted into the center hole 14. As a result, the steel disk 18 is centered.

  Next, in response to a start operation (not shown), the operation of the press device 36 is started and the first mold 44 is lowered, so that the outer peripheral portion of the steel disc 18 becomes the first mold 44 and the second mold. 54. As described above, the tapered outer peripheral portion 16 is press-formed on the outer peripheral portion of the steel disk 18 by being sandwiched between the inclined surface 44a of the first mold 44 and the inclined surface 54a of the second mold 54. The FIG. 8 shows a processing state of the tapered outer peripheral portion forming step 20. When the tapered outer peripheral portion 16 is formed, tension is generated when the inner peripheral portion is drawn. The ram 40 for lowering the first mold 44 and the plurality of hydraulic actuators 52 for raising the second mold 54 are used to form the tapered outer periphery 16 in the tapered outer periphery forming step 20. 44 and the second mold 54 function as a first drive device.

  Subsequently, when the first mold 44 is further lowered, the inner peripheral portion of the steel disk 18 is clamped between the first mold 44 and the third mold 50. As described above, when sandwiched between the first mold 44 and the third mold 50, the annular convex portion 10 is formed by the annular concave groove 44 c of the first mold 44 and the protrusion 50 b of the third mold 50. Drawing is performed on the inner periphery of the steel disk 18, and the disk-shaped material 12 is formed. FIG. 9 shows a processing state of the annular convex portion forming step 22. In this drawing process, tension is generated between the tapered outer peripheral part 16 and the drawing part, and the material hardly flows to the drawing part side, so that generation of distortion and wrinkles is suitably suppressed. The ram 40 that further lowers the first mold 44 functions as a second drive device that drives the first mold 44 to draw the annular protrusion 10 in the annular protrusion forming step 22.

  FIG. 10 is a diagram schematically illustrating a main part of the thickening apparatus 61 for performing the first thickening step 24 and the second thickening step 26. The thickening device 61 includes a first thickening roller 62 rotatably supported around a center line (rotation axis) S1 by a rotation support device (not shown), and a circle which is a flat steel plate having a substantially constant thickness t. A disk holding jig 64 for holding the plate material 12 in a posture concentric with and perpendicular to the center line (rotation axis) S2 parallel to the center line S1, and the disk material 12; And a control device (not shown) for controlling the rotation driving device 66 and the approaching / separating device 68 so that the thickness increase molding by plastic deformation is performed on the outer peripheral portion.

  The disk holding jig 64 is known as a so-called mandrel, and is rotated around the center line S2 by a rotation driving device 66 such as an electric motor, and is centered together with the rotation driving device 66 by an approach / separation device 68. By being moved linearly in a horizontal direction perpendicular to the lines S1 and S2 and in a straight line direction (the left-right direction in FIG. 1) connecting the centerlines S1 and S2, and being moved toward and away from the first thickening roller 62 The taper-shaped outer peripheral portion 16 of the disk-shaped material 12 is plastically deformed while the thickness-increasing roller 62 is rotated to increase the thickness to a predetermined shape corresponding to the cross-sectional shape of the forming groove 70 of the first thickness-increasing roller 62. To do. The first thickening roller 62 may also be rotationally driven at a predetermined rotational speed around the center line S1 by a rotary drive device such as an electric motor, or the approach / separation device 68 may be driven by the first thickening roller 62. You may make it provide in the side or both.

  The disk holding jig 64 includes a pair of thick disk-shaped pressing members 72 and 74 having substantially the same outer diameter so that they can approach and separate in the axial direction. A centering member 76 is provided for fitting with the center hole 14 of the disk-shaped material 12 and centering the disk-shaped material 12, and includes a predetermined outer peripheral portion 16 of the disk-shaped material 12. With the outer peripheral portion protruding from the clamping members 72 and 74 to the outer peripheral side by a predetermined dimension in the initial state, the inner peripheral side portion of the disk-shaped material 12 is clamped by a pair of pressing surfaces (end surfaces) 72a and 74a from both sides. Therefore, the pair of clamping members 72 and 74 do not interfere with the first thickening roller 62 and the second thickening roller (not shown) in the first thickening molding step 24 and the second thickening molding step 26. The diameter is sufficiently smaller than the outer diameter of the disk-shaped material 12. The second thickening roller is different in that it includes a molding groove having a shape different from that of the molding groove 70 of the first thickening roller 62, but is otherwise the same.

  The forming groove 70 of the first thickening roller 62 has a substantially V-shaped cross section and is open to the outer peripheral surface of the first thickening roller 62, and is a surface perpendicular to the center line (rotating shaft core) S1. A first inclined surface 70a having a relatively large inclination angle θ1 of about 20 degrees and a second inclined surface 70b having an inclination angle θ2 smaller than that of the first inclined surface 70a. In the first thickening step 24, the outer peripheral edge of the disk-shaped material 12 is driven to rotate while being pressed against the groove bottom of the molding groove 70 and the first inclined surface 70a. Since the inclination angle θi of the outer peripheral portion 16 with respect to the surface of the disk-shaped material 12 is the same as the inclination angle θ1 of the first inclined surface 70a, the outer peripheral edge of the disk-shaped material 12 in the first thickening step 24. The process for bending (inclining) is no longer necessary, and the efficiency of increasing the wall thickness is increased.

  As described above, according to the press forming method of the disk-shaped material 12 using the press device 36 of the present embodiment, the tapered outer peripheral portion 16 is formed in advance in the tapered outer peripheral portion forming step 20 to increase the tension. Since the annular convex portion 10 is drawn in the annular convex portion forming step 22 with respect to the inner peripheral portion of the disc-shaped material 12, tension is generated between the tapered outer peripheral portion 16 and the annular convex portion 10. The material is less likely to flow to the inner peripheral side, and no distortion or wrinkle occurs during the drawing process for forming the annular convex portion 10. In addition, since the tapered outer peripheral portion 16 formed on the outer peripheral portion of the disk-shaped material 12 can be used as it is, it is preliminarily bent to the outer peripheral portion in order to apply tension during drawing. No trimming is required to remove the flange.

  In addition, according to the present embodiment, the tapered outer peripheral portion 16 of the disk-shaped material 12 is thickened by using the first thickening roller 62 in the first thickening step 24 after the annular convex portion forming step 22. The tapered outer peripheral portion 16 of the disk-shaped material 12 has an angle θi corresponding to the cross-sectional shape of the forming groove 70 of the first thickening roller 62 used in the first thickening step 24. Therefore, there is an advantage that it is not necessary to bend the tapered outer peripheral portion 16 prior to thickening.

  Further, according to the present embodiment, the tapered outer peripheral portion forming step 20 has the inclined surface (first tapered surface) 44a on the outer peripheral portion and the annular groove (first throttle surface) 44c on the inner peripheral portion. Relative to the first mold 44 and the second mold 54 that has an inclined surface (second tapered surface) 54a corresponding to the inclined surface 44a and is provided to face the outer periphery of the first mold 44 The taper-shaped outer peripheral portion 16 is formed between the inclined surface 44a and the inclined surface 54a by making them approach closely, and the annular convex portion forming step 22 includes the first mold 44 and the first metal mold. It has a ridge (second diaphragm surface) 50 b corresponding to the annular groove 44 c of the mold 44 and is provided on the inner peripheral side of the second mold 54 so as to face the inner peripheral portion of the first mold 44. By bringing the third mold 50 relatively close, the annular convex portion 10 is moved between the annular concave groove 44c and the convex strip 50b. Since it is intended to form, without the need for transporting between processes, there is an advantage that the tapered outer peripheral portion forming process 20 and the annular convex portion forming process 22 is performed in the processing place at one location.

  Further, in the press forming apparatus 36 of the present embodiment, (a) a first gold having an inclined surface (first tapered surface) 44a on the outer peripheral portion and an annular groove (first drawing surface) 44c on the inner peripheral portion. A mold 44, and (b) a second mold 54 having an inclined surface (second tapered surface) 54a corresponding to the inclined surface 44a and provided to face the outer peripheral portion of the first mold 44; c) Convex ridge (second diaphragm surface) 50 b corresponding to the annular concave groove 44 c of the first mold 44, facing the inner periphery of the first mold 44, and the inner periphery of the second mold 54 A third mold 50 provided so as to be relatively movable on the side, and (d) a first mold for press-molding a tapered outer peripheral portion 16 inclined at a predetermined taper angle on the outer peripheral portion of the disc-like material 12. A ram 40 and a hydraulic actuator 52 (first driving device) for moving the second mold 54 relatively close to the mold 44; and (e) a tapered outer peripheral portion 16 is formed. A ram 40 (second driving device) for moving the third mold 50 relatively close to the first mold 44 in order to draw the annular convex portion 10 on the inner peripheral portion of the disk-shaped material 12 thus formed. Therefore, there is an advantage that the tapered outer peripheral portion forming step 20 and the annular convex portion forming step 22 are executed at one processing place without requiring conveyance between steps.

  As mentioned above, although one Example of the Example of this invention was described in detail based on drawing, this invention is applied also in another aspect.

  For example, the inclined surface 44a provided on the outer peripheral portion of the first mold 44 and the inclined surface 54a provided on the outer peripheral portion of the second mold 54 according to the above-described embodiment are directed toward the ram 40, that is, upward. Although it was the inclination which goes, conversely, the inclination which goes below as it goes to an outer periphery may be sufficient.

  In the above-described embodiment, an annular groove 44c is provided on the inner peripheral portion of the first mold 44 for drawing, and the third mold 50 has a shape corresponding to the annular groove 44c. Although the protrusion 50b is provided, the protrusion 50b may be provided in the first mold 44, and the annular groove 44c may be provided in the third mold 50. Note that the convex shape 50b may come into contact with the steel disk 18 during the formation of the tapered outer peripheral portion 16, and a slight distortion may occur. In this case, a process for correcting the convex shape 50b is performed during the drawing.

  Moreover, in the above-mentioned Example, the taper-shaped outer peripheral part shaping | molding process 20 and the cyclic | annular convex part shaping | molding process 22 use the 1st metal mold | die 44 and the 2nd metal mold | die 54, and the 1st metal mold | die 44 and the 3rd metal mold | die 50, respectively. Although it was executed at one place, it may be executed at different places. Further, although the annular convex portion forming step 22 is executed following the tapered outer peripheral portion forming step 20, it may be executed simultaneously.

  Note that the above description is merely an embodiment, and the present invention can be implemented in variously modified and improved forms based on the knowledge of those skilled in the art.

It is a front view which shows the disk-shaped raw material to which an example of the press molding method of this invention is applied. It is an axial sectional view explaining the cross-sectional shape of the disk-shaped raw material of FIG. FIG. 2 is a process diagram for sequentially explaining a process for molding the disk-shaped material of FIG. 1 and a process for molding a drive plate from the disk-shaped material. It is principal part sectional drawing which shows the thickness increase state with respect to the outer peripheral part of the disk-shaped raw material of the 1st thickness increase process of FIG. It is principal part sectional drawing which shows the thickness increase state with respect to the outer peripheral part of the disk-shaped raw material of the 2nd thickness increase process of FIG. It is principal part sectional drawing which shows the outer periphery tooth shaping | molding state of the rolling process of FIG. It is a figure explaining the principal part of the press apparatus which performs the taper-shaped outer peripheral part formation process of FIG. 3, and a cyclic | annular convex part formation process, Comprising: The state before starting is shown. It is a figure which shows the state which the press apparatus of FIG. 7 is performing the taper-shaped outer peripheral part formation process. It is a figure which shows the state which the press apparatus of FIG. 7 is performing the cyclic | annular convex part formation process. It is a figure explaining the thickness increase molding apparatus for performing the 1st thickness increase process of FIG.

Explanation of symbols

10: annular convex portion 12: disk-shaped material 16: tapered outer peripheral portion 20: tapered outer peripheral portion forming step (press forming step)
22: annular convex molding process (drawing molding process)
40: Ram (first driving device, second driving device)
44: First mold 44a: Inclined surface (first tapered surface)
44c: Annular groove (first diaphragm surface)
50: 3rd metal mold | die 50b: A protruding item | line (2nd aperture surface)
52: Hydraulic actuator (first drive unit)
54: Second mold 54a: Inclined surface (second tapered surface)
62: First thickening roller 70: Molding groove

Claims (4)

It is a press molding method of a disk-shaped material provided with an annular convex part on the inner peripheral part,
A tapered outer periphery forming step of press-molding a tapered outer periphery inclined at a predetermined taper angle on the outer periphery of the disc-shaped material;
An annular convex forming step of drawing the annular convex on the inner peripheral portion of the disc-shaped material simultaneously with or after the tapered outer peripheral portion is formed by the tapered outer peripheral portion forming step. A method for press-molding a disk-shaped material. The tapered outer peripheral portion of the disk-shaped material is thickened using a thickening roller in a thickening step after the annular convex molding step,
The disk-shaped material press-molding method according to claim 1, wherein the tapered outer peripheral portion of the disk-shaped material has an angle corresponding to a cross-sectional shape of a molding groove of a thickening roller used in the thickening step. The tapered outer peripheral portion forming step includes a first mold having a first tapered surface on the outer peripheral portion and a first throttle surface on the inner peripheral portion, and a second tapered surface corresponding to the first tapered surface. The taper-shaped outer peripheral portion between the first taper surface and the second taper surface is obtained by relatively approaching the second mold provided facing the outer peripheral portion of the first mold. Are molded,
The annular projection forming step includes the first mold and a second diaphragm surface corresponding to the first diaphragm surface of the first mold so as to face the inner peripheral part of the first mold and The annular convex portion is formed between the first diaphragm surface and the second diaphragm surface by relatively approaching a third mold provided on the inner peripheral side of the second mold. The press molding method of the disk-shaped raw material of Claim 1 or 2. A press molding apparatus for press-molding a disk-shaped material having an annular convex portion on an inner peripheral portion,
A first mold having a first tapered surface on the outer peripheral portion and a first diaphragm surface on the inner peripheral portion;
A second mold having a second taper surface corresponding to the first taper surface and provided opposite to the outer periphery of the first mold;
A third mold having a second diaphragm surface corresponding to the first diaphragm surface and facing the inner periphery of the first mold and provided on the inner periphery side of the second mold;
A first driving device for relatively bringing the second mold closer to the first mold in order to press-mold a tapered outer circumference inclined at a predetermined taper angle on the outer circumference of the disk-shaped material. When,
Second drive for bringing the third mold relatively close to the first mold in order to draw an annular convex portion on the inner peripheral portion of the disk-shaped material on which the tapered outer peripheral portion is formed. An apparatus for press-molding a disk-shaped material, comprising:

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