JP2007160333A - Method for forming cup shape component, and forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for forming a cup shape component, which method can prevent the deterioration of the flatness of a bottom surface portion, and can form the cup shape component having a toothed surface on its side wall portion by a small force, and can reduce the size of an apparatus, and further to provide a forming apparatus. <P>SOLUTION: A die 2, a punch 3, and a knockout plate 6 are used when the cup shape component 8 is formed. A blank material piece 80 is held between the punch 3 and the knockout plate 6. Then, the punch 3 and the knockout plate 6 are moved toward the die 2, As a result, the bottom surface portion and the side wall portion are formed by drawing the blank material piece 80 by means of a drawing surface 211 and a punch side teeth forming surface 52. After that, the punch 3 and the knockout plate 6 are furthermore moved toward the die 2, As a result, the toothed surface is formed on the side wall portion by ironing the side wall portion by means of a die side teeth forming surface 221 and the punch side teeth forming surface 52. Thus, the cup shape component can be obtained. In this case, the drawing operation and the ironing operation are carried out by a one-stroke motion of the punch 3. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention has a bottom surface portion and a ring-shaped side wall portion erected in the axial direction from an outer peripheral end portion of the bottom surface portion, and a molding method and a molding apparatus for a cup-shaped part formed by forming a tooth surface on the side wall portion About.

  When molding cup-shaped parts such as clutch drums, in the first step, a flat plate-shaped piece of material as a work piece is drawn and formed from a bottom surface and an annular end standing from the outer peripheral end of the bottom surface The side wall portion is formed. Next, the material piece on which the bottom surface portion and the side wall portion are formed is transported to the second step, and another processing is performed on the material piece, and at the same time, the deformation generated in the bottom surface portion and the side wall portion is corrected. Thereafter, the straightened material piece is conveyed to the third step, and the material piece is ironed to form a tooth surface on the side wall portion.

  Further, in the clutch drum forming method of Patent Document 1, in the first step, a disc-shaped sheet metal as a work is provided with an end plate portion (bottom surface portion) and a side wall portion erected from the outer periphery thereof. In the second step, the side wall portion is drawn into a stepped cup shape having a first tube portion and a second tube portion having a larger diameter than the first tube portion. Next, in the third step, the first tube portion is compressed in the axial direction, and in the fourth step, the first tube portion is further compressed, and the opening end of the second tube portion is corrected to make the second tube portion full length. And formed into a cylinder. Thereafter, in the fifth step, the second cylinder portion is ironed to form a spline portion.

  By the way, in the conventional molding method, when each of the above steps is performed, a transfer press device including a plurality of molding press devices is prepared, and each step sequentially conveys a workpiece to each molding press device by transfer. Is going. In each step, each molding is performed by setting the molding standard of the workpiece to, for example, the position corresponding to the bottom surface of the molded part.

However, in the above-described transfer press apparatus, the workpiece is remounted for each process, and it is necessary to prevent the position corresponding to the bottom surface portion of the molded part from shifting. In addition, when performing molding in each process, deformation may occur in the position corresponding to the bottom surface portion, and it is necessary to mold the deformation in advance with a large load before transferring the molded part to the next process. is there.
As a result, the transfer press apparatus requires a large molding press apparatus that can withstand a heavy load, and there is a problem in that the entire facility is increased in size. This problem also occurs in the case where a plurality of single-acting presses that are independently operated are arranged side by side and the material pieces are formed and transferred between the single-acting presses in sequence.

Japanese Patent Laid-Open No. 10-216875

  The present invention was made in view of such conventional problems, can prevent the flat accuracy of the bottom surface portion, can be molded cup-shaped parts having tooth surfaces on the side wall portion with a small load, It is an object of the present invention to provide a cup-shaped part molding method and molding apparatus that can reduce the size of equipment.

In a method of molding a cup-shaped part having a bottom surface portion and an annular side wall portion standing from an outer peripheral end portion of the bottom surface portion, and forming a tooth surface on the side wall portion,
In forming the cup-shaped part, a die provided with a forming hole, and a punch and a knockout arranged to face each other so as to slide in the forming hole of the die are used. It is divided into a punch core part located on the center side,
And on the inner wall surface of the forming hole, a drawing surface for drawing the side wall portion and a die side tooth forming surface for forming the tooth surface on the side wall portion are formed. On the outer peripheral surface of the punch, a punch side tooth mold forming surface for forming the tooth surface on the side wall portion together with the die side tooth mold forming surface is formed.
A material piece clamping step of clamping a material piece between the punch outer periphery and the knockout,
The punch outer peripheral portion and the knockout in a state where the material piece is sandwiched are advanced with respect to the die, and the material piece is drawn by the draw forming surface and the punch side tooth forming surface, and the side wall is formed. A side wall forming step for forming the portion
The outer peripheral portion of the punch and the knockout in a state of sandwiching the material piece are further advanced with respect to the die, and the side wall portion is ironed by the die side tooth mold forming surface and the punch side tooth mold forming surface. And a tooth surface forming step for forming the tooth surface,
The cup-shaped component molding method is characterized in that the material piece clamping step, the side wall portion forming step, and the tooth surface forming step are performed by a one-stroke operation of the punch outer peripheral portion (Claim 1).

  In the method for molding a cup-shaped part of the present invention, the material piece is sandwiched between the outer peripheral portion of the punch and the knockout as the material piece clamping step. Next, as the side wall portion forming step, the punch outer peripheral portion and the knockout in a state where the material piece is sandwiched are advanced with respect to the die. At this time, the material piece is drawn by the opening corner portion of the forming hole in the die and the drawing forming surface of the forming hole. And in a raw material piece, while a bottom face part is formed in the part pinched between punch outer peripheral part and knockout, a side wall part is formed in the circumference | surroundings of this bottom face part. Further, the side wall portion is squeezed in an inclined manner by the opening corner portion of the forming hole, and is then erected vertically with respect to the flat portion by the drawing surface of the forming hole.

Next, as the tooth surface forming step, the punch outer peripheral portion and the knockout in a state where the material piece is sandwiched are further advanced with respect to the die. At this time, iron molding is performed on the side wall portion of the material piece by the die side tooth mold forming surface of the die and the punch side tooth mold forming surface of the punch outer peripheral portion. And in a raw material piece, a side wall part is pinched | interposed between the die | dye side tooth-die shaping | molding surface and a punch side tooth-die shaping | molding surface, and a tooth surface is formed by bending alternately on an inner peripheral side and an outer peripheral side.
Thus, a cup-shaped part formed by forming a side wall portion having a tooth surface can be formed.

  In the present invention, the drawing and ironing can be performed while the material piece is always sandwiched between the outer periphery of the punch and the knockout. Therefore, it is possible to always maintain the plane accuracy of the portion sandwiched between the outer peripheral portion of the punch and the knockout in the material piece, and perform the drawing and ironing, and the bottom portion formed in the sandwiched portion It can prevent that planar accuracy falls.

  Further, the drawing and ironing can be performed by a one-stroke operation in which the outer peripheral portion of the punch advances toward the die. Therefore, in each forming step, it is not necessary to transfer the piece of material between a plurality of molds, and the forming reference surface of the piece of material (in the present invention, the portion sandwiched between the outer periphery of the punch and the knockout is the material. It becomes no longer necessary to re-form the molding reference surface. Furthermore, in this invention, the process which corrects the unnecessary deformation | transformation of the raw material piece produced when shape | molding cup-shaped components is not required.

  Therefore, according to the method for molding a cup-shaped part of the present invention, it is possible to prevent the lowering of the plane accuracy of the bottom surface portion, and to mold a cup-shaped component having a tooth surface on the side wall portion with a small load. Can be miniaturized.

The second invention is an apparatus for forming a cup-shaped part having a bottom surface portion and an annular side wall portion standing from the outer peripheral end portion of the bottom surface portion, and forming a tooth surface on the side wall portion.
The molding apparatus includes a die provided with a molding hole, and a punch and a knockout arranged to face each other so as to slide in the molding hole of the die.
The punch is divided into a punch outer peripheral part and a punch core part located on the center side thereof,
On the inner wall surface of the forming hole in the die, a drawing surface for drawing the side wall portion and a die side tooth forming surface for forming the tooth surface on the side wall portion are formed. ,
On the outer peripheral surface of the punch outer peripheral portion in the punch, a punch side tooth mold forming surface for forming the tooth surface on the side wall portion together with the die side tooth mold forming surface is formed,
The molding apparatus is configured to sandwich a piece of material between the punch outer peripheral portion and the knockout by a one-stroke operation of the punch outer peripheral portion, and advance the punch outer peripheral portion and the knockout relative to the die. The cup-shaped part molding apparatus is characterized in that (Claim 3).

  In the cup-shaped component molding apparatus of the present invention, the cup-shaped component can be molded while always holding the material piece between the outer periphery of the punch and the knockout. Therefore, it is possible to perform molding while always maintaining the planar accuracy of the portion sandwiched between the outer peripheral portion of the punch and the knockout in the material piece, and the planar accuracy of the bottom surface portion formed in the sandwiched portion is reduced. Can be prevented.

  The cup-shaped part can be formed by a one-stroke operation in which the outer peripheral portion of the punch advances toward the die. Therefore, there is no need to transfer the material piece between a plurality of molding dies, and the material reference forming surface (in the present invention, the portion sandwiched between the outer periphery of the punch and the knockout is the material reference forming surface of the material piece. Is no longer required to be reshaped. Furthermore, in this invention, the process which corrects the unnecessary deformation | transformation of the raw material piece produced when shape | molding cup-shaped components is not required.

  Therefore, according to the cup-shaped component molding apparatus of the present invention, it is possible to prevent a decrease in the plane accuracy of the bottom surface portion, and to mold a cup-shaped component having a tooth surface on the side wall portion with a small load. Can be miniaturized.

A preferred embodiment in the first and second inventions described above will be described.
In the first and second inventions, the cup-shaped part is preferably a clutch hub.
In this case, it is possible to prevent a decrease in planar accuracy of the bottom surface portion of the clutch hub, and to form a clutch hub having a tooth surface on the side wall portion with a small load.
The clutch hub can be a power transmission component such as a transmission.

The cup-shaped part molded in the first and second inventions is formed by forming a protruding portion that protrudes in an annular shape toward the side opposite to the standing direction of the side wall portion at the outer peripheral end portion of the bottom surface portion. It is preferable.
In this case, in the cup-shaped component in which the protruding portion is formed, the axial length from the bottom surface portion to the distal end portion of the side wall portion (opening distal end portion of the cup-shaped component) can be shortened. Thereby, the other part which meshes with the tooth surface in the side wall part of the cup-shaped part can be arranged closer to the bottom surface part in the axial direction of the cup-shaped part. Therefore, the whole assembly including the cup-shaped component and other components meshing with the cup-shaped component can be made compact.

Hereinafter, embodiments of the cup-shaped part molding method and molding apparatus according to the present invention will be described with reference to the drawings.
Example 1
As shown in FIGS. 1 to 7, the molding device 1 (hereinafter simply referred to as the molding device 1) for the cup-shaped component 8 of this example is a bottom surface portion 81 and an annular erected from the outer peripheral end portion of the bottom surface portion 81. The cup-shaped component 8 formed by forming the tooth surface 821 on the side wall 82 is formed.

As shown in FIG. 1, the molding apparatus 1 includes a die 2 having a die hole (molding hole) 20, a punch 3 and a knockout 6 disposed so as to face each other so as to slide in the die hole 20 of the die 2. have. The punch 3 is divided into a punch outer peripheral portion 5 and a punch core portion 4 located on the center side thereof.
In addition, on the inner wall surface of the die hole 20 in the die 2, a drawing surface 211 for drawing the side wall portion 82 and a die side tooth forming surface 221 for forming the tooth surface 821 on the side wall portion 82 are formed. Has been. Further, a punch side tooth mold forming surface 52 for forming the tooth surface 821 on the side wall portion 82 is formed on the outer peripheral surface of the punch outer peripheral portion 5 together with the die side tooth mold forming surface 221.

As shown in FIGS. 1 to 6, the molding apparatus 1 sandwiches the material piece 80 between the punch 3 and the knockout 6 by the one-stroke operation of the punch 3, and puts the punch 3 and the knockout 6 into the die 2. It is configured to move forward.
Below, it explains in full detail with FIGS. 1-7 about the shaping | molding apparatus 1 and the shaping | molding method of the cup-shaped component 8 of this example.

  The molding apparatus 1 of this example is a hydraulic molding apparatus 1 that molds a cup-shaped part 8 by hydraulic pressure. The punch outer peripheral portion 5 is configured to operate under pressure applied by hydraulic pressure. Moreover, the shaping | molding apparatus 1 of this example is comprised so that the punch 3 and the knockout 6 may move toward the downward direction in the die hole 20 of the die | dye 2, and it may shape | mold as shown in FIGS. Further, the punch 3 is positioned above the knockout 6, and the advancement of the punch core portion 4, the punch outer peripheral portion 5 or the knockout 6 means that they are lowered.

As shown in FIG. 1, the die 2 includes a drawing die portion 21 formed with the drawing surface 211 and a tooth die portion 22 formed with the die side tooth forming surface 221. . Further, a drawing die portion 21 and a tooth die portion 22 are arranged in order from the side close to the punch 3 (in this example, from the top). Further, the drawing surface 211 and the die side tooth surface 221 are formed in communication with each other about the same axis.
Further, the opening corner portion 201 of the die hole 20 in the die 2, that is, the opening corner portion 201 of the drawing surface 211 is formed in a curved shape or a tapered shape.

As shown in FIGS. 1 and 2, the punch core portion 4 can be stored in a core arrangement recess 53 formed in the punch outer peripheral portion 5.
Further, the punch core portion 4 is configured to move forward following the advancement of the punch outer peripheral portion 5. That is, as shown in FIG. 1, the punch core portion 4 is disposed on the punch outer peripheral portion 5 in a state protruding from the tip end portion of the punch outer peripheral portion 5 at an initial position before molding. Moreover, the punch core part 4 is arrange | positioned by the punch outer peripheral part 5 via the gas cushion (not shown).

As shown in FIG. 2, the punch core portion 4 moves forward together with the punch outer peripheral portion 5 and is housed in the punch outer peripheral portion 5 against the urging force of the gas cushion when the advancement is stopped by the knockout 6. It is configured as follows.
The knockout 6 is configured to form a fixed state in which the movement is fixed and a driven state in which the knock outer periphery 5 moves forward as the punch outer peripheral portion 5 moves forward.

The material piece 80 has a disc shape and has a through hole 800 at the center thereof (see FIG. 8 of Example 2).
Further, as shown in FIG. 1, the punch core portion 4 and the knockout 6 have a positioning projection 41 on one of them for positioning them, and a positioning recess 62 into which the positioning projection 41 can be inserted. have. In this example, a positioning projection 41 is formed on the punch core portion 4, and a positioning recess 62 is formed on the knockout 6. The positioning projection 41 is inserted into the positioning recess 62 through the through hole 800.

As shown in FIG. 7, the cup-shaped component 8 to be molded in this example has a tooth surface 821 on its side wall 82, and is a clutch hub used for a transmission. The tooth surface 821 in the side wall portion 82 has a material portion having a predetermined width, and is formed with irregularities alternately on the inner peripheral side and the outer peripheral side of the side wall portion 82.

In this example, the following forming steps are performed using one molding apparatus 1 having the above-described configuration, and the cup-shaped component 8 formed by forming the tooth surface 821 on the side wall portion 82 is molded.
In forming the cup-shaped component 8, first, as shown in FIG. 1, a material piece 80 is placed on the knockout 6 as a material placement step. Next, as shown in FIG. 2, as a material piece clamping step, the material piece 80 is sandwiched between the front end surface 40 of the punch core portion 4 and the pressure front end surface 51 of the punch outer peripheral portion 5 and the opposed front end surface 60 of the knockout 6. To do.

Next, as shown in FIG. 3, as the side wall portion forming step, the punch outer peripheral portion 5 and the knockout 6 with the material piece 80 sandwiched are advanced with respect to the die 2. At this time, the material piece 80 is drawn by the opening corner portion 201 of the die hole 20 in the die 2 and the drawing surface of the die hole 20.
As shown in FIG. 4, in the material piece 80, a bottom surface portion 81 is formed at a portion sandwiched between the punch 3 and the knockout 6, and a side wall portion 82 is formed around the bottom surface portion 81. The Further, the side wall portion 82 is squeezed in an inclined shape by the opening corner portion 201 of the die hole 20, and is then formed upright with respect to the bottom surface portion 81 by the drawing surface 211 of the die hole 20.

Next, as shown in FIG. 5, as the tooth surface forming step, the punch outer peripheral portion 5 and the knockout 6 with the material piece 80 sandwiched are further advanced with respect to the die 2. At this time, iron forming is performed on the side wall portion 82 of the material piece 80 by the die side tooth mold forming surface 221 of the die 2 and the punch side tooth mold forming surface 52 of the punch 3. And in the raw material piece 80, the side wall part 82 is pinched | interposed between the die | dye side tooth shaping | molding surface 221 and the punch side tooth shaping | molding surface 52, and it bends alternately by the inner peripheral side and the outer peripheral side, and the tooth surface 821 becomes It is formed.
In this way, the cup-shaped component 8 formed by forming the side wall portion 82 having the tooth surface 821 can be formed.

  As shown in FIG. 6, when the molded cup-shaped part 8 is taken out from the die 2, as an extraction process, the punch outer peripheral portion 5 is retracted (raised) with respect to the punch core portion 4, and then the punch outer peripheral portion 5 and The punch core part 4 and the knockout 6 are retracted.

  In this example, the drawing and ironing can be performed while the material piece 80 is always held between the punch outer peripheral portion 5 and the knockout 6. Therefore, it is possible to perform drawing and ironing while always maintaining the plane accuracy of the portion of the material piece 80 sandwiched between the outer peripheral portion 5 of the punch and the knockout 6, and formed in the sandwiched portion. It can prevent that the planar accuracy of the bottom face part 81 falls.

  The drawing and ironing can be performed by a one-stroke operation in which the punch outer peripheral portion 5 moves forward toward the die 2. Therefore, in each of the above forming steps, there is no need to transfer the material piece 80 between a plurality of molding dies, and it is sandwiched between the molding reference surface of the material piece 80 (in this example, the punch outer peripheral portion 5 and the knockout 6). It is no longer necessary to re-form the formed portion to be the forming reference surface of the material piece 80.) Furthermore, in this example, the process which corrects the unnecessary deformation | transformation of the raw material piece 80 produced when shape | molding the cup-shaped component 8 is not required.

Further, by performing the drawing and ironing by a one-stroke operation of the punch outer peripheral portion 5, the equipment capacity of the forming apparatus 1 for performing each forming step is the required load of the forming step with the largest load in each forming step. And downsizing of the equipment can be achieved.
Moreover, since each formation process in the shaping | molding apparatus 1 is not performed simultaneously, but is performed sequentially, the timing which a peak load generate | occur | produces in each formation process can be shifted, and the electric power allowable value of the shaping | molding apparatus 1 can be made small.

  Therefore, according to the molding apparatus 1 and the molding method of the cup-shaped component 8 of this example, the cup-shaped component in which the flat surface accuracy of the bottom surface portion 81 is prevented and the tooth surface 821 is provided on the side wall portion 82 with a small load. 8 can be molded, and the equipment can be downsized.

(Example 2)
As shown in FIGS. 8 to 19, the molding device 10 for the cup-shaped component 8 of the present example (hereinafter simply referred to as the molding device 10) is the standing direction of the side wall portion 82 at the outer peripheral end portion of the bottom surface portion 81. The cup-shaped component 8 having a stepped bottom shape is formed by forming a protruding portion 811 protruding in an annular shape toward the opposite side. By forming the protruding portion 811 on the bottom surface portion 81, the axial length of the tooth surface 821 in the side wall portion 82 can be increased.

As shown in FIGS. 14 and 19, the pressure front end surface 51 in the punch outer peripheral portion 5 of this example has a convex shape for forming the protruding portion 811, and the punch core portion 4 is formed on the punch outer peripheral portion 5. It is configured to be able to protrude from the pressure front end surface 51. Further, the knockout 6 of the present example includes a depression facing surface 61 having a depression shape along the protruding shape of the pressing tip surface 51 at a portion facing the pressing tip surface 51.
Further, when the punch outer peripheral portion 5 moves forward with respect to the knockout 6, the pressing front end surface 51 protrudes from the front end surface 40 of the punch core portion 4 to press the material piece 80.

And the shaping | molding apparatus 10 of this example clamps the raw material piece 80 between the punch core part 4 and the knockout 6 as shown in FIG. 10, FIG. 15 by 1 stroke operation | movement of the punch outer peripheral part 5, Then, FIG. 16, the punch outer peripheral portion 5 is moved forward with respect to the knockout 6, and then the punch outer peripheral portion 5 and the knockout 6 are moved with respect to the die 2 as shown in FIGS. 12, 13, 17, and 18. It is configured to move forward.
Hereinafter, the cup-shaped part molding apparatus and molding method of this example will be described in detail with reference to FIGS.

As shown in FIG. 19, the pressure front end surface 51 formed in an annular shape at the front end portion of the punch outer peripheral portion 5 includes an outer peripheral inclined surface portion 512 inclined to the outer peripheral side and an inner peripheral side of the outer peripheral inclined surface portion 512. And an inner peripheral flat surface portion 511 formed flat at the tip end portion.
Further, the depression facing surface 61 of the knockout 6 is formed in an annular depression from the facing front end surface 60 of the knockout 6, and the outer peripheral facing surface portion 612 facing the outer peripheral inclined surface portion 512 of the pressurizing front end surface 51 and the additional processing surface. The pressure front end surface 51 includes an inner peripheral facing surface portion 611 facing the inner peripheral flat surface portion 511.
In addition, the structure of each part in the shaping | molding apparatus 10 of this example is the same as that of the said Example 1. FIG.

In this example, the following forming steps are performed using one molding apparatus 10 having the above-described configuration, and the cup-shaped component 8 having a step bottom shape is molded.
In molding the cup-shaped component 8, first, as shown in FIG. 14, a material piece 80 (see FIG. 8A) is placed on the knockout 6 as a material placement step.

  Next, as shown in FIGS. 10 and 15, the punch outer peripheral portion 5 is advanced (lowered) in a state where the punch core portion 4 protrudes from the tip end portion of the punch outer peripheral portion 5 as the material piece clamping step. At this time, the punch core portion 4 contacts the material piece 80, and the material piece 80 is sandwiched between the punch core portion 4 and the knockout 6. Further, the material piece 80 is sandwiched in a state where the urging force of the gas cushion in the punch core portion 4 is received.

  Next, as shown in FIGS. 11 and 16, when the punch outer peripheral portion 5 is further advanced as the protruding portion forming step, the advancement of the punch core portion 4 is stopped by the knockout 6, and the punch outer peripheral portion 5 advances toward the knockout 6. To do. At this time, the knockout 6 is fixed so as not to move.

As shown in FIG. 19, in a state where the material piece 80 is sandwiched between the punch core portion 4 and the knockout 6, a part of the material piece 80 is depressed by the pressure front end surface 51 of the punch outer peripheral portion 5. Pressurization is performed toward the facing surface 61, and the protrusion 811 (see FIG. 8B) is formed between the pressure front end surface 51 and the depressed facing surface 61. Further, the bottom surface portion 81 is formed simultaneously with the formation of the protruding portion 811.
Further, when the protruding portion 811 is formed, a part of the material piece 80 is sandwiched and pressed by the outer peripheral inclined surface portion 512 in the pressurizing tip surface 51 and the outer peripheral facing surface portion 612 in the depression facing surface 61 along with the formation. As a result, a pre-inclined side wall portion 83 (see FIG. 8B) that is inclined in an annular manner from the outer peripheral end of the protruding portion 811 is formed.

  Next, as shown in FIG. 12 and FIG. 17, as a side wall portion forming step, the material piece 80 on which the protruding portion 811 and the preliminary inclined side wall portion 83 are formed is placed between the punch core portion 4 and the punch outer peripheral portion 5 and the knockout 6. The punch outer peripheral portion 5 is advanced with respect to the die 2 while maintaining the state of being sandwiched between the dies 2. At this time, the knockout 6 is in a state of being able to move under the pressure applied by the punch outer peripheral portion 5 and advances with the advancement of the punch outer peripheral portion 5. Then, drawing is performed on the outer peripheral side portion of the preliminary inclined side wall portion 83 by the drawing surface 211 in the die hole 20 of the drawing die portion 21, and the side wall portion 82 erected from the bottom surface portion 81 (FIG. Reference) is formed.

Thereafter, as shown in FIGS. 13 and 18, as the tooth surface forming step, the punch outer peripheral portion 5 and the knockout 6 with the material piece 80 sandwiched are further advanced with respect to the die 2. At this time, iron forming is performed on the side wall portion 82 of the material piece 80 by the die side tooth mold forming surface 221 of the die 2 and the punch side tooth mold forming surface 52 of the punch outer peripheral portion 5.
In this way, a cup-shaped component having a tooth surface 821 on the side wall 82 and a protrusion on the bottom surface can be formed (see FIG. 8D).

In this example, the above-described draw forming and ironing can be performed while the protruding portion 811 is always held between the punch outer peripheral portion 5 and the knockout 6. Therefore, it can prevent that the plane accuracy of the bottom face part 81 provided with the protrusion part 811 falls. Other operational effects in this example are the same as those in the first embodiment.
Therefore, also by the molding apparatus 10 and the molding method of the cup-shaped component 8 of this example, the cup-shaped component 8 having the tooth surface 821 on the side wall portion 82 with a small load is prevented by preventing the flat accuracy of the bottom surface portion 81 from being lowered. Thus, the equipment can be downsized.

Sectional explanatory drawing which shows the shaping | molding apparatus of the cup-shaped components of the state which performed the raw material arrangement | positioning process in Example 1. FIG. Sectional explanatory drawing which shows the shaping | molding apparatus of the cup-shaped components of the state which performed the raw material piece clamping process in Example 1. FIG. Sectional explanatory drawing which shows the shaping | molding apparatus of the cup-shaped components in the state which is performing the side wall part formation process in Example 1. FIG. Sectional explanatory drawing which shows the shaping | molding apparatus of the cup-shaped components of the state which performed the side wall part formation process in Example 1. FIG. Sectional explanatory drawing which shows the shaping | molding apparatus of the cup-shaped components in the state which performed the tooth surface formation process in Example 1. FIG. Sectional explanatory drawing which shows the shaping | molding apparatus of the cup-shaped components in the state which is performing the taking-out process in Example 1. FIG. Sectional explanatory drawing which shows a cup-shaped component in Example 1. FIG. FIG. 5 is a diagram showing a flow of molding a cup-shaped part in Example 2, in which (a) a piece of material, (b) a protruding portion, a bottom surface portion, and a preliminary inclined side wall portion are formed, and (c) a side wall portion is formed. (D) Explanatory drawing which shows a cup-shaped component. Sectional explanatory drawing which shows the cup-shaped component in Example 2. FIG. FIG. 9 is a perspective explanatory view showing a cup-shaped part molding apparatus in a state where a material piece clamping process is performed in Example 2; FIG. 9 is a perspective explanatory view showing a cup-shaped part molding apparatus in a state where a protruding part forming step is performed in Example 2; FIG. 9 is a perspective explanatory view showing a cup-shaped part molding apparatus in a state where a side wall part forming step is performed in Example 2; The perspective explanatory drawing which shows the shaping | molding apparatus of the cup-shaped components in the state which performed the tooth surface formation process in Example 2. FIG. Sectional explanatory drawing which shows the shaping | molding apparatus of the cup-shaped components in the state which performed the raw material arrangement | positioning process in Example 2. FIG. Sectional explanatory drawing which shows the shaping | molding apparatus of the cup-shaped components in the state which performed the raw material piece clamping process in Example 2. FIG. Sectional explanatory drawing which shows the shaping | molding apparatus of the cup-shaped components in the state which performed the protrusion part formation process in Example 2. FIG. Sectional explanatory drawing which shows the shaping | molding apparatus of the cup-shaped components in the state which performed the side wall part formation process in Example 2. FIG. Sectional explanatory drawing which shows the shaping | molding apparatus of the cup-shaped components in the state which performed the tooth surface formation process in Example 2. FIG. Sectional explanatory drawing which expands and shows the shaping | molding apparatus of the cup-shaped components in the state which performed the protrusion part formation process in Example 2. FIG.

Explanation of symbols

1, 10 Cup-shaped part molding equipment 2 Dice 20 Die hole (molding hole)
211 Drawing forming surface 221 Die side tooth forming surface 3 Punch 4 Punch core portion 5 Punch outer peripheral portion 51 Pressurizing tip surface 52 Punch side tooth forming surface 6 Knockout 61 Depression facing surface 8 Cup-shaped part 80 Material piece 81 Bottom surface portion 811 Projection Part 82 side wall part 821 tooth surface 83 preliminary inclined side wall part

Claims (3)

In a method of molding a cup-shaped part having a bottom surface portion and an annular side wall portion standing from the outer peripheral end of the bottom surface portion, and forming a tooth surface on the side wall portion,
In forming the cup-shaped part, a die provided with a forming hole, and a punch and a knockout arranged to face each other so as to slide in the forming hole of the die are used. It is divided into a punch core part located on the center side,
And on the inner wall surface of the forming hole, a drawing surface for drawing the side wall portion and a die side tooth forming surface for forming the tooth surface on the side wall portion are formed. On the outer peripheral surface of the punch, a punch side tooth mold forming surface for forming the tooth surface on the side wall portion together with the die side tooth mold forming surface is formed.
A material piece clamping step of clamping a material piece between the punch outer periphery and the knockout,
The punch outer peripheral portion and the knockout in a state where the material piece is sandwiched are advanced with respect to the die, and the material piece is drawn by the draw forming surface and the punch side tooth forming surface, and the side wall is formed. A side wall forming step for forming the portion
The outer peripheral portion of the punch and the knockout in a state of sandwiching the material piece are further advanced with respect to the die, and the side wall portion is ironed by the die side tooth mold forming surface and the punch side tooth mold forming surface. And a tooth surface forming step for forming the tooth surface,
A cup-shaped component molding method, wherein the material piece clamping step, the side wall portion forming step, and the tooth surface forming step are performed by a one-stroke operation of the punch outer peripheral portion.   2. The method of molding a cup-shaped part according to claim 1, wherein the cup-shaped part is a clutch hub. In an apparatus for forming a cup-shaped part having a bottom surface portion and an annular side wall portion standing from the outer peripheral end portion of the bottom surface portion, and forming a tooth surface on the side wall portion,
The molding apparatus includes a die provided with a molding hole, and a punch and a knockout arranged to face each other so as to slide in the molding hole of the die.
The punch is divided into a punch outer peripheral part and a punch core part located on the center side thereof,
On the inner wall surface of the forming hole in the die, a drawing surface for drawing the side wall portion and a die side tooth forming surface for forming the tooth surface on the side wall portion are formed. ,
On the outer peripheral surface of the punch outer peripheral portion in the punch, a punch side tooth mold forming surface for forming the tooth surface on the side wall portion together with the die side tooth mold forming surface is formed,
The molding apparatus is configured to sandwich a piece of material between the punch outer peripheral portion and the knockout by a one-stroke operation of the punch outer peripheral portion, and advance the punch outer peripheral portion and the knockout relative to the die. An apparatus for forming a cup-shaped part.

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