JP2505846Y2 - Disk-shaped flange material manufacturing equipment - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk-shaped flange material manufacturing apparatus which is a preforming material for disk-shaped flange parts such as clutch pistons used in fluid automatic transmissions of automobiles.

[0002]

2. Description of the Related Art Conventionally, a disk-shaped flange component of this type is
It is forged while warm or hot. That is, a material obtained by shearing a rod-shaped material having a predetermined outer diameter to a predetermined length is shot peened, and then is subjected to high frequency heating in a warm or hot forging temperature range, and each forging step of preforming and punching is performed, A disc-shaped flange material 1 as shown in is obtained. After that, the disk-shaped flange material 1 is again shot-peened, and the cutting allowance is removed by cutting,
A race-finished disk-shaped flange component was made.

[0003]

FIG. 7 shows the punching and forming process as described above, but the material 101 is a disk shape with a thin wall thickness in the axial direction, and the cross-sectional area of the piercing punch 124 is relatively large. Therefore, the warp in the pressing direction of the piercing punch 124 is particularly likely to occur at the center of the material during the punching, and an appropriate straightening step must be performed.

In this regard, if the material straightening process is independently provided, there is a problem that the production efficiency is deteriorated. Also,
Even if the strained material is forged again, there is a problem that if the dynamic pressure is applied for a short time like a crank press, springback occurs after the correction load is removed and the strain is not corrected sufficiently.

[0005]

The present invention has the following structure.

1. An annular recess is provided on the tip surface of the pre-forging punch to form the upper end surface of the flange portion, and the annular recess has a gentle gradient centrifugal from the axis of the pre-forging punch and has an internal volume of the annular recess. Is about 70 to 90% of the amount of material strain when the center hole is pierced.

2. An acute-angled circumferential projection is provided on the outer circumference of the tip of the piercing punch in the center hole.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 3 shows a preliminary forging device 11 for forging the preliminary forging material 5 shown in FIG. 2 while warm or hot.
12 is an upper mold and 18 is a lower mold.
The upper die 12 includes a pressure receiving plate 13, a preliminary forging punch 14 fixed by a punch holder 15, and a preliminary forging punch 14.
And a tightening ring 16 for fixing. The lower die 18 has a die engraving space 19 on the surface facing the punch 14 fixed to the upper die 12.
It has a lower die 19 in which a is formed, and a knockout punch 20 which is slidably fitted in an inner peripheral hole of the lower die 19 and which moves in and out of the die engraving space 19a.

FIG. 5 shows an enlarged view of the tip of the preliminary forging punch 14. Pre-forging material 5 as shown in FIG.
An annular recess 14a is provided on the tip surface of the pre-forging punch 14 that is to form the upper end surface shape of the flange portion 6. The annular recess 14a has a gentle gradient α that is centrifugal from the axis P of the pre-forging punch 14. Have.

FIG. 8 shows the strain amount (m) in the piercing with respect to the relative ratio of A and B, where A is the amount of material strain during piercing and B is the inner volume of the annular recess 14a in the pre-forging punch 14.
It is a graph which shows the result of having measured occurrence of m). As is clear from this measurement result, the inner volume B of the annular recess 14a that can suppress the occurrence of strain during piercing is approximately 70 to 90% of the material strain amount A during piercing of the center hole 4 in the subsequent step. If it exceeds 90%, distortion occurs in the direction opposite to the pressing direction of the piercing punch 24, and as a result, bulges are left on the upper end surface of the flange portion 2 after piercing.

Next, the central portion 8c of the preliminary forging material 5 is punched out and the disc-shaped flange material 1 as shown in FIG.
FIG. 4 shows a punching molding apparatus 21 for molding the.

In the figure, 22 is an upper mold and 28 is a lower mold. The upper die 22 includes the pressure receiving plate 23 and the punch holder 2
6, the piercing punch 24 fixed by 6, and the upper die 2 mounted so as to be movable relative to the piercing punch 24 in the axial direction.
5, an upper die holder 33 that guides the upper die 25 back and forth, and a tightening ring 27 that fixes these to the pressure receiving plate 23. Further, the upper mold 22 is provided with a spring 32 that presses the tip surface of the upper mold 25 toward the lower mold 28. The lower mold 28 has a lower mold 29 having an annular convex portion formed on the surface facing the upper mold 25, and a die ring 30 surrounding the outer periphery of the lower mold 29.

As shown in FIG. 6, the piercing punch 24 is enlarged to form a central hole 4 of the disk-shaped flange component 1, and an acute angle β is formed on the outer periphery of the piercing punch 24. A circumferential convex portion 24a having a circle is provided.

Next, a method of forming a disc-shaped flange material using the manufacturing apparatus of the present invention will be described.

A material obtained by shearing a rod-shaped material having a predetermined outer diameter to a predetermined length is shot-peened, and then is subjected to high-frequency heating in a warm or hot forging temperature range, and a preliminary forging apparatus 1 shown in FIG.
The lower mold 19 of 1 is supplied into the engraving space 19a. Then, as shown in the drawing, the upper die 12 is lowered to perform pre-forging.

As a result, the tip portion of the pre-forging punch 14 fixed to the upper die 12 comes into contact with the material and presses it so that the shape of the upper end surface of the flange portion 6 of the pre-forged material 5 formed is preliminarily changed. It is formed following the shape of the tip of the forging punch 14. That is, an annular convex portion having a volume slightly smaller than the material strain amount A at the time of piercing in the subsequent step is formed on the upper end surface of the preliminary forging material 5 formed by the preliminary forging punch 14 having the annular concave portion 14a at the tip thereof. 10
Are formed as shown in FIG. The volume amount of the annular convex portion 10 is the same as the inner volume B of the annular concave portion 14a of the pre-forging punch 14, and is about 70 to about the material strain amount A during piercing.
It will be about 90%.

Next, the preliminary forging material 5 is set between the upper and lower molds 22 and 28 of the punching molding apparatus 21 shown in FIG. 4, and the upper mold 22 is lowered as shown in the right half of FIG. Is done.

As a result, the tip of the piercing punch 24 provided with the circumferential convex portion 24a having the acute angle β on the outer periphery becomes the center portion 8c of the preforming material 5 to be punched, as shown in the left half of FIG. The piercing punch 24 abuts and the lowering of the upper die 22 advances the lowering of the piercing punch 24. In the initial stage of punching, the circumferential convex portion 2 having an acute angle β at the tip of the piercing punch 24.
4a, after the contour of the central hole 4 is shear-molded at the central portion 8c, which is the central hole-forming portion, the lowering of the piercing punch 24 further advances, so that the central hole 4 is punched out as shown in the right half of FIG. Be done.

In the above punching forming, since the annular convex portion 10 having a volume of about 70 to 90% of the material strain amount at the time of punching is formed on the upper end surface of the preforming material 5, the piercing punch 24 at the time of punching is formed. The center hole 4 can be stamped and formed without causing distortion of the material in the pressing direction.

Furthermore, since the contour of the center hole 4 is shear-molded by the peripheral convex portion 24a of the acute angle β at the tip of the piercing punch 24, the center hole 4 is punch-molded, so that the stress load at the time of punching is alleviated. The center hole 4 can be punched without causing distortion of the material in the pressing direction of the piercing punch 24 during punching.

[0022]

As described above, according to the present invention, the upper end surface of the pre-forged material has a strain amount of about 70 to 9 of the material strain at the time of punching.
Since the annular convex portion having a volume of 0% is formed, the center hole can be punched without causing distortion of the material in the pressing direction of the piercing punch during punching. Therefore, it is not necessary to separately provide the distortion correcting step of the forming material, and the production efficiency is improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional plan view showing a disc-shaped flange material.

FIG. 2 is a sectional plan view showing a preliminary forging material according to an embodiment of the present invention.

FIG. 3 is a partial sectional plan view showing a preliminary forging device according to an embodiment of the present invention.

FIG. 4 is a partial cross-sectional plan view showing a punching molding apparatus according to an embodiment of the present invention.

FIG. 5 is a partial cross-sectional plan view showing a main part of a pre-forging punch according to an embodiment of the present invention.

FIG. 6 is a partial sectional plan view showing a main part of a piercing punch according to an embodiment of the present invention.

FIG. 7 is an explanatory view showing a conventional punching forming process.

FIG. 8 is a graph showing an experimental result of effect measurement according to an embodiment of the present invention, in which B (internal volume of annular recess <mm ³ >) /
The relation between A (material strain amount during piercing <mm ³ >) × 100 <%> and material strain during piercing <mm> is shown.

[Explanation of symbols]

 1 Disc-shaped flange material 2, 6 Flange part 3, 7 Boss part 4 Center hole 5 Pre-forging material 9 Upper end surface 14 Pre-forging punch 14a Annular recess 24 Pierce punch 24a Circular convex part P Pre-forging punch axis A Piercing Amount of material strain at the time B Internal volume of annular recess

Claims (2)

(57) [Scope of utility model registration request] 1. A manufacturing apparatus for a disc-shaped flange blank, comprising a large-diameter flange portion, a small-diameter boss portion, the flange portion, and a central hole penetrating the boss portion in the axial direction. An annular recess (14a) is provided in the tip surface of the pre-forging punch (14) to form the end face (9), and the annular recess (14a) is provided in the pre-forging punch (1).
4) has a gentle gradient (α) centrifugal from the central axis (P), and the inner volume (B) of the annular recess (14a) is equal to the material strain amount (A) at the time of piercing the central hole (4). About 70-90
% Of the disk-shaped flange material manufacturing device. 2. A circumferential projection (24a) having an acute angle (β) on the outer circumference of the tip of the pierce punch (24) of the central hole (4).
The disc-shaped flange material manufacturing apparatus according to claim 1, further comprising: