JPS6217145Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a forging die, and particularly to a forging die for forging undercut parts.

Figures 1 to 3 show an example of an undercut part, in which a plurality of recesses 2 are provided in the circumferential direction on the end face of a boss part of a molded product 1 such as a gear material, and one side of the recesses 2 is widened at the bottom. The bottom of the recess 2 is wider than the opening, and one surface of the partition wall 3 that partitions the recesses 2 is undercut.

When forming the concave portion 2 of such an undercut part by forging, the molded product cannot be removed from the die after forming with a simple die.

The present invention aims to provide a forging die that can form the above-mentioned undercut parts and also allows the molded product to be easily removed from the die after forming.

Hereinafter, embodiments of the present invention will be described based on FIG. 4 and subsequent figures.

In this embodiment, a mold apparatus for press-working a material 1a shown in FIGS. 4 and 5 into a molded product shown in FIGS. 1 and 2 will be described.

The material 1a is provided with recesses 2a that are substantially the same as the molded product in the circumferential direction, and partition walls 3a between the recesses 2a protrude slightly, for example, about 2 mm, from the other surfaces. By crushing the protrusion 4 of this partition wall 3a so that it is flush with the other surface, the opening edge of the recess 2a becomes narrower than the inner part, and the recess 2a
One surface of the partition wall 3a between the two is undercut-molded.

FIG. 6 and subsequent figures show a mold apparatus for forming an undercut portion on the partition wall 3a of the material 1a.

FIG. 6 is a vertical sectional view of the entire mold apparatus, in which 10 is a bolt, 11 is a slide, 12 is a die set fixed to the bolster 10, 13 is a die receiver, 1
4 is a die placed on this die receiver 13 and fixed to the die set 12. Further, 15 is a punch fixed to the slide 11 facing the upper surface of the die 14.

As shown in FIGS. 6 to 9, the die 14 has a hole 14a penetrating through its axial center, and the inner surface of the hole 14a has protrusions that abut against each partition wall 3a of the material 1. 16, and a groove 17 facing the recess 2a of the material 1 is provided between the protrusions 16 in the circumferential direction. The upper part of each of the protrusions 16 in the circumferential direction is inclined.

The groove 17 of the die 14 is located at the axis of the die receiver 13.
A hole 18 having the same diameter as the diameter of the hole 18 is provided.

19 is a ring, and 20 is a knockout, which are arranged as shown in FIGS. 11 to 18, and extend concentrically and axially through the hole 14a of the die 14 and the hole 18 of the die receiver 13. and are fitted in a slidable manner in the circumferential direction.

The lower parts of the ring 19 and the knockout 20 are formed into a cylindrical shape, and are fitted concentrically with each other. Further, the upper parts of the ring 19 and the knockout 20 are provided with protruding rods 21 and 22 having comb-teeth shapes in the circumferential direction, and these protruding rods 21 and 22 are adjacent to each other in the circumferential direction and are arranged in the grooves of the die 14. 17.

The tips of the ring 19 and knockout 20 are in the normal state, that is, both lower end surfaces are in the die set 1.
The ring 19 and the protruding rods 21 and 22 of the knockout 20 protrude upward from the die 14 by the depth of the recess 2 of the molded product 1 while in contact with the plate 23 of the molded product 1. A partition wall 3 between the recesses 2 of the molded product 1 is formed on the side surface of the molded product 1.

The shapes of the protrusions 16 of the die 14, the ring 19, and the protrusions 21 and 22 of the knockout 20 and their mutual relationship will be explained below with reference to FIGS. 19 and 20.

FIG. 20 is a developed view along the outer circumferential surface of the concave molded part shown in FIG. In the shape of molding the side surface of the die 14, an overhanging α
is tilted at an angle of The lower side of this inclined surface is in close contact with the vertical surface of the protrusion 16 of the die 14. The other side surface 21b of the protruding rod 21 of the ring 19 is also provided with a slope inclined in the same direction at an angle of β, where α<β.

On the other hand, a side surface 22a of the protrusion bar 22 of the knockout 20 and on the protrusion bar 21 side of the ring 19 is inclined at the same angle as the slope of the protrusion bar 21 of the ring 19.

The other side surface 21b of the protruding rod 21 of the ring 19
The slope of the knockout 20 and the slope of one side surface 22a of the protruding rod 22 of the knockout 20 that come into contact with the slope are longer on the knockout 20 side. Therefore, there is a gap 2 between the two protruding rods 21 and 22 below the contact part.
There are 4.

The other side surface 22 of the protrusion 22 of the knockout 20
As mentioned above, b protrudes from the protrusion 16 of the die 14, and this part forms the vertical wall of the partition wall 3 of the molded product 1. The upper part of this side surface 22b is vertical, and the lower part The side is inclined at the same angle as the inclined surface 16a of the side surface of the protrusion 16 of the die 14. Then, on the vertical plane, the protrusion 16 of the die 14
Due to the contact with the corner of the die 14, there is a gap 25 between the protrusion 16 of the die 14 and the lower side of the inclined surface.

26 is fitted into the ring 19 and the shaft center 20 of the knockout 20, and is inserted into the plate 2 of the die set 12.
7, the ring 19 has a slight dimension in its axial direction due to the fixing member 26.
For example, it is regulated to be slidable over a distance of about 2 mm,
It is biased in the projecting direction by a spring 28. The knockout pin 29 is located at the lower end of the knockout 20.
are facing each other.

The operation of the above configuration will be explained below.

In FIG. 6, the left side of the center line shows the state before the molding operation, and the right side shows the state after molding and after completion of knockout.

In the above-mentioned state before molding, as shown in the developed view of FIG. 19, the protruding rods 21 and 22 of the ring 19 and the knockout 20 protrude from the upper surface of the protruding strip 16 of the die 14 by the depth of the recess 2. It is becoming.

Place the material 1a shown in FIGS. 4 and 5 on the mold in this state, with its molding surface facing downward, and place the material 1a in the recess 2.
a, and the partition wall 3a is placed above the protrusion 16 of the die 14, and the double protrusion bars 21, 2
2 (Fig. 21).

Next, the punch 15 is moved downward to press the material 1a. In this way, as shown in FIG. 22, the partition wall 3a of the material 1a is filled in the recessed portion, and the partition wall 3a is formed into an undercut-shaped partition wall 3.

After forming, the punch 15 rises. Then, the bed knockout rises and the knockout pin 29 is pushed up. The knockout 20 rises due to the knockout pin 29 being pushed up, and at this time, the ring 19 is also biased by the spring 28 and rises together with the knockout 20, for example by about 2 mm, until it abuts against the fixed member 26, as shown on the right side of Fig. 6 and in Fig. 23. In this state, the formed product 1 rises together with the ring 19 and knockout 20 and leaves the die 14.

As the knockout pin 29 further rises from the above state, only the knockout 20 rises. In this way, the result is as shown in FIG.
While being regulated by the corner of the protrusion 16 of the die 14,
The ring 19 is rotated in the direction of inclination of both side surfaces, that is, the ring 19 is rotated by the gap 24 toward the protruding rod 21, and the side surface 22a of the protruding rod 22 of the knockout 20 on the partition wall forming side is separated from the partition wall. Therefore, as the knockout 20 rises, the molded product 1 slightly rotates toward the protrusion rod 22 of the knockout 20 and moves toward the protrusion rod 21 of the ring 19.
Move further away.

In the above state, the molded product 1 is placed only on the knockout 20, and then the molded product is removed from the knockout 20 by hand.

Since the present invention is as described above, after molding the molded product 1, the knockout 20 is raised by the knockout device, and the knockout 20 is guided by the slopes provided on both sides of the protruding rod 22 of the knockout 20. The side surface of the protruding rod 22 is rotated and raised in a direction away from the partition wall 3 of the molded product 1, and the molded product 1 having an undercut is rotated slightly and separated from the side surface of the protruding rod 21 of the ring 19 forming the undercut surface. be done.

Therefore, the above-mentioned molded product having the undercut is removed from the die 14 and the ring 19 by a normal knockout operation.
It can be easily separated and removed by hand from a mold consisting of. Furthermore, with this mold structure, it is possible to undercut both circumferential sides of the recessed part of the workpiece at the same time.

[Brief explanation of the drawing]

Figures 1 to 3 show an example of a molded product formed by the device of the present invention. Figure 1 is a front view, Figure 2 is a sectional view, and Figure 3 is shown along the - line in Figure 1. 4 and 5 show the material for the above-mentioned molded product, FIG. 4 is a front view, FIG. 5 is a sectional view,
Fig. 6 is an overall sectional view, Figs. 7 to 10 show the configuration of the die, Fig. 7 is a plan view, Fig. 8 is a sectional view, Fig. 9 is an enlarged plan view of main parts, and Fig. 9 is an enlarged plan view of the main part. Figure 10 is a cross-sectional view taken along line - in Figure 9, Figures 11 to 14 show the ring, Figure 11 is a plan view, and Figure 12 is a cross-sectional view taken along line XII-XII in Figure 11. Fig. 13 is an enlarged plan view of the main part, Fig. 14 is an external developed view of the main part, Figs. 15 to 18 show knock-outs, Fig. 15 is a plan view, and Fig.
The figure is a sectional view taken along the - line in Figure 15.
Fig. 7 is an enlarged plan view of the main parts, Fig. 18 is an external developed view of the main parts, Fig. 19 is a plan view showing the assembled state of the device of the present invention, and Fig. 20 is a sectional view taken along the - line in Fig. 19. , FIG. 21 to FIG. 24 are action explanatory diagrams. 1 is a molded product, 2 is a recess, 3 is a partition wall, 14 is a die, 16 is a protrusion, 19 is a ring, 20 is a knockout, 21 and 22 are protrusions, and 24 is a gap.

Claims (1)

[Scope of utility model registration request] In a forging die for forging a molded product having a plurality of concave portions 2 in an arcuate direction on a disk-shaped surface and undercut side surfaces of partition walls 3 between the concave portions, the partition wall of the molded product is A die 14 with protrusions 16 protruding from the cylindrical inner surface that abuts the end faces of the die 14, and a side wall on one undercut side of each partition wall 3 of the molded product 1 is formed between the protrusions 16 of this die 14. A ring 1 in which a protruding rod 21 is provided in a comb-teeth shape protruding in the circumferential direction.
9, the protruding rod 21 side of this ring 19 and the die 14
The partition wall 3 of the molded product 1 is located between the protrusion 16 of the
It consists of a knock-out 20 in which a protruding rod 22 forming the other side wall is protruded in a comb-like shape in the circumferential direction, and a knock-out device for knocking out the knock-out 20, and the ring of the protruding rod 22 of the knock-out 20 The side surface 22a that contacts the tip of the protrusion bar 21 of No. 19 is inclined in the same direction as the slope of the undercut, and a gap 24 is created between the protrusion bars 21 and 22 below the contact portion of both protrusion bars 21 and 22. The above-mentioned die 1 of the protruding rod 22 of the knockout 20 is provided.
4. A forging die characterized in that the lower side of the part that contacts the protrusion 16 of No. 4 is inclined in the same direction as the slope of the undercut.