JPS6018505B2 - Manufacturing method of buffer pad - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a buffer pad which, when a part of a workpiece is pressed to form, clamps the part that is not to be pressed to prevent the workpiece from moving.

Conventionally, punch pads that clamp the workpiece that undergoes plastic processing during pressing in press dies are made of cast metal or iron plates, and the clamping surface is made of the same material. There are problems such as impact noise and sliding when the machine and the workpiece move against each other.

In addition, wear occurs easily due to the contact between the pad and punch during use, shortening the lifespan of the pad and punch. For this reason, the following pads have recently been proposed. That is, in FIG. 1, 1 is a punch, 2 is a pad body, and 3 is a punch.
4 is a device for press-forming the processed portion 3A of the workpiece 3, and 4 is a fixed cam 5 that is fixed to the upper holder and moves together with the upper holder. and a passive cam 6 moved by a fixed cam 5. Reference numeral 7 denotes a cushioning material attached to the lower surface of the pad body 2 with screws or adhesive, which together with the pad body 2 forms a cushioning pad. That is, when the buffer pad comes into pressure contact with the workpiece 3 placed on the punch 1, it is interposed between the buffer pad and the workpiece 3 to prevent impact noise and scratches from occurring. After the workpiece 3 is clamped between the buffer pad and the punch 1, the fixed cam 5 moves the passive cam 6 to the left to press-form the workpiece portion 3A of the workpiece 3. However, even in the press die configured as described above, the formed cushioning material 7 is simply attached to the bottom surface of the pad body 2 regardless of the shape of the workpiece 3, so in the case of a workpiece with a complicated shape, There may be places where the pressure between the buffer material 7 and the workpiece 3 is insufficient, resulting in insufficient clamping properties.

In addition, if the shape of the workpiece is complicated, the cushioning material 7 is formed in advance to match the shape of the workpiece 3 and is attached to the pad body 2 using screws or adhesive so that the cushioning material 7 matches the shape of the workpiece 3. It was extremely difficult to attach it correctly. The present invention has been made in view of the above, and its purpose is to form an appropriate gap using a pad body and a punch (or a punch to which a workpiece is attached), and then fill the gap with a liquid cushioning material in advance. It is an object of the present invention to provide a method for manufacturing a cushioning material pad whose shape and pressure-bonding position match a workpiece and which is optimally bonded to a pad body by pouring a raw material and curing it. Next, the method of the present invention will be explained based on the drawings.

FIG. 2 shows a part of a press mold having a buffer pad 10 to be manufactured by the method of the present invention, 11 is a punch, 12 is a pad body, 13 is a workpiece, 18 is an upper holder, The material 14 is integrally fixed to the periphery of the lower surface (surface) of the pad body 12, as shown in the cross-sectional shape of FIG. 3, thereby forming a buffer pad. Next, a method for manufacturing the buffer pad will be explained step by step.

1st process 3 As shown in FIG. 4, grooves 15 are formed around the surface of the pad body 12, and when the cushioning material is fixed to the surface of the pad body 12 in the later process when manufacturing the cushioning material pad, the cushioning material is to prevent it from falling off from the surface of the pad body 12. Instead of the groove 15, or at a location where a groove cannot be formed, a countersunk screw 16 or the like may be installed as shown in FIGS. 5 and 6. Second step: If the surface shape of the pad body 12 is upwardly convex, the pad 2 is set upside down in order to facilitate the pouring of liquid cushioning material raw material, which will be described later.

At this time, liners 19, 19 are laid between the upper holder 18 and the pad body 12 as shown in FIG.
position. Further, a band-shaped workable material 20 is attached to the surface of the pad body 12 in a ring shape. This workable 20 is attached to the pad body 12 with adhesive, and the pad body 12 is adjusted to have a thickness approximately equal to the desired thickness of the cushioning material.
2 and the workpiece 13 attached to the punch 11. Next, work safety lock 2
Liners 22, 22 are inserted between 1 and the upper holder 8, and the punch 11 is placed upside down on the pad body 12. At this time, the workpiece 13 is temporarily fixed on the surface of the punch 11, and a release agent is applied to the surface of the workpiece 13. Further, the heights of the liners 22, 22 are adjusted so that the gap 1 between the surface of the pad body 12 and the surface of the workpiece 13 has the expected thickness of the cushioning material. Furthermore, at this time, Workable 2
The attachment of the workable 20 is adjusted by a flattening method using Komeitan so that a gap is created between the workpiece 13 and the surface of the workpiece 13, and the liquid buffer material does not flow from the gap. Third step: As shown in Figure 9, double-sided tape 2 is attached to some parts.
After applying the scale agent to the inside of the transparent plate 24 on which 3 is pasted,
This transparent plate 24 is inserted into the gap 1 between the punch 11 and the pad body 12.
Seal around all four sides.

As a result, the inner side of the gap 1 is the workable member 201.
The outside is sealed by a transparent plate 24, but the inside can be seen through the transparent plate 24. Next, a part of the transparent plate 24 is cut out to form a sprue 25 for pouring the liquid cushioning material raw material as shown in FIG. 10, and a gas vent hole (not shown) is formed. A sprue 25 is made at the highest level of the gap 1, and the gap etc. is sealed using clay 26. 4th step: Mix the main layer of the buffer material with a hardening agent and mix the urethane rubber liquid (
A cushioning material raw material) is prepared and slowly poured into the gap 1 from the sprue 25.

The state of the buffer material poured into the gap 1 can be observed through the transparent plate 24. After pouring a predetermined amount of liquid (an amount that fills the gap), leave it for a predetermined period of time to wait for the cushioning material raw material to harden. At this time, care must be taken to prevent the liquid cushioning material from leaking from the transparent plate 24 or other gaps. Fifth step: Wait for the liquid to harden and then remove the transparent plate 24.

Next, the punch 11 is slowly lifted to release the mold. Since a mold release agent is applied to the surface of the workpiece 13 that is integrated with the punch 11, it is easy to release the mold, but care must be taken to prevent the cushioning material 14 from being damaged. When punch 11 is removed,
A buffer pad is obtained in which a buffer material 14 having an annular shape and whose surface matches the surface shape of the workpiece 13 is fixed to the surface of the pad body 12. Next, remove the workable 20,
Or, by scraping off the protruding urethane rubber,
As shown in FIG. 1, a cushioning pad can be obtained in which a cushioning material 14 is fixed to the surface of a pad body 12. The cushioning material 14 is fixed to the surface of the pad body 12 by its own adhesive force, but the first
The fixation is further strengthened by the use of grooves 15, countersunk screws 16, etc. in the process. In the above example, the gap into which the liquid buffering material is poured was formed using a punch with a pad and workpiece attached, but if the shape of the workpiece is not complicated, the gap may be formed by simply using the pad and punch. It may be formed by

Also, when pouring in the liquid cushioning material, the pad and punch were sealed upside down compared to the normal usage state, but it goes without saying that it can be sealed in the normal usage state by making appropriate fences and vent holes. stomach. In addition, when the cushioning material 7 to be fixed to the pad body 2 shown in the conventional example shown in FIG. A cushioning pad can be manufactured by forming a gap and pouring liquid cushioning material into the gap.

However, according to the above method, the downward stroke of the pad becomes longer due to the newly manufactured cushioning material, so this must be adjusted. Therefore, in order to increase the downward stroke by the expected thickness of the cushioning material, the pad main body side corresponding to the pad retainer portion 17 is made shorter than the subordinate rod as shown in FIG. 7, and adjustments are made to obtain a stroke. It is necessary to attach the member 17a and adjust the stroke of the pad. As described above, according to the method of the present invention, a gap is formed between the pad body and the punch or the workpiece by temporarily fixing the punch and the punch by surrounding the circumference with a fence made of a workable or transparent plate, A curable liquid curable cushioning material raw material is poured into this gap to form the cushioning material, and at the same time as the cushioning material is formed, it is fixed to the surface of the pad body by its own adhesive force, so that the surface of the workpiece is This has the advantage that the cushioning material can be easily formed on the pad body in a shape that matches the shape and in an accurate attachment position to the pad body.

[Brief Description of the Drawings] Fig. 1 is a sectional view of a conventional punch structure, Fig. 2 is a schematic sectional view of a pad structure according to the method of the present invention, and Fig. 3 is a cross-sectional view of a conventional punch structure.
FIGS. 4 to 6 are cross-sectional views showing different processing examples of the pad surface. FIG. 7 is a view showing an example of retainer processing. FIG. 8 is a cross-sectional view of the set state. FIG. 9 10 is a schematic perspective view of a sprue, and FIG. 11 is a partial sectional view of the completed pad. 11... punch, 12... pad, 13... workpiece,
14...Buffer material, 15...Groove, 16...
... Blood screw, 19, 22 ... Liner, 20 ... Work couple, 24 ... Sample plate, 25 ... Sprue, 1 ... Gap. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11

Claims (1)

[Claims] 1. A mechanism for preventing the cushioning material from falling off, such as a groove or a countersunk screw, is provided on the surface of the pad body in advance to form a gap between the punch or the workpiece attached to the punch and the pad body, and the gap is fenced. After sealing with a mold release agent and applying a mold release agent to the surface of the gap except for the pad body, pour a liquid curable cushioning material raw material into the gap and leave it until it hardens. A method for manufacturing a cushioning pad, characterized in that a cushioning pad in which a cushioning material is integrally molded and fixed to a pad body is obtained by removing the cushioning pad.