JPS5976627A - Hold-down device in press die - Google Patents

Abstract

PURPOSE:To prevent the generation of wrinkle and flaw by inscribing a long groove along the position of a punch or die where hold-down is required, interposing an urethane elastic body in said groove and fitting loosely a block for pressing therein. CONSTITUTION:A long groove 10 is hollowed out along the position of, for example, a punch 7, where hold-down is required and a block 11 for pressing is loosely fitted therein in the stage of interposing a plate material 9 in dies consisting of the punch 7 and a die 8 and pressing the same. A hole is inscribed from the surface of the block 11 facing to a press surface 12 that contacts with the material 9 toward the surface 12 and an urethane elastic body 13 is tightly inserted therein. A space adjusting material 14 such as a washer having a suitable thickness is inserted to the top surface of the body 13 and the degree of projection of the surface 12 with respect to the surface of the punch 7 is finely adjusted. A receiving seat 17 is provided on the die 8 on the side opposite from the side where the pressing force of the surface 12 acts via the material 9. The peripheral edge part of the material 9 is thus prevented from the generation of wrinkle and flaw.

Description

[Detailed description of the invention] a. Industrial field of application This invention presses the peripheral part of a plate to prevent wrinkles or scratches from forming when molding with a press mold consisting of an upper mold and a lower mold. The present invention relates to a presser device that does this.

b. Prior Art It is said that it is extremely difficult to properly press the periphery of a plate material during a forming press; if the pressing force is too high, the plate material will break, and if it is too small, wrinkles will occur and the quality of processing will deteriorate.

Conventionally, springs are often used as suppressing materials, but
When a strong elastic pressing force is desired during a slight displacement, for example, in the case of the present study, a displacement of approximately 1 to 2 rm, a spring is inappropriate, and rubber is inappropriate as it is too soft.

Conventionally, long protrusions and grooves called beats were installed in the joint area around the upper and lower molds to sandwich the plate material, which resulted in long depressions being formed along the trim fins of the molded product.
It was held down by the friction generated by its long curved surface.

However, since it is necessary to cut the long curved surface in the subsequent finishing process, the size of the plate was determined in advance with the expectation that a long cutout would be created around the periphery of the molded product. A great deal of waste was generated, a large amount of space was taken up while waiting for transportation, and scraps piled up, which became an obstacle to reducing production costs and other rationalization.

C-Object of the Invention The object of the present invention is to solve the above-mentioned problems, and to eliminate the need to form any deformed parts dedicated to the presser on the periphery of the molding plate, and to be effective even when the plate is on a straight surface. It is possible to perform proper pressing, and there is no risk of scratches or wrinkles caused by the pressing, so it is possible to have a pressing surface that is extremely suitable for subsequent finishing processes such as spot welding, and furthermore, it is possible to have a pressing surface that is extremely suitable for subsequent finishing processes such as spot welding. An object of the present invention is to create and provide a presser device that generates very little waste such as (scrap), does not take up space for waiting for transportation, and can reduce production costs.

d. Seimei's structure To summarize the structure of this study, a long groove is carved along the position where pressing is required in the upper or lower mold, and an elastic body made of urethane is interposed in the groove to create a pressing block. The object of the present invention is to obtain a presser device in which the blocks are loosely connected to each other, or are supported by cross shafts from the sides with a clearance so that the blocks do not fall off.

e1 Effect of the invention The effect of the present investigation is to finely adjust the degree of protrusion using a spacing adjustment material so that the pressing surface of the pressing bufunk protrudes outward from the surface of the mold by about 1 to 21 cm when no load is applied. Then, under such conditions, when one mold fits and presses the other mold, the plate material sandwiched between them is strongly pressed by the sealed urethane elastic body through the pressing surface, Effective and appropriate pressing can be performed when the plate material is on a straight surface.

f. Example A specific example of the present study will be described in detail below using figures.

When a plate material 9 is inserted between a mold consisting of an upper mold 7 and a lower mold 8 and is pressed, a long groove 10 is formed in either the upper mold 7 or the lower mold 8 along the position where pressing is required. A suppressing block 11 is fitted into the groove.

There is a pressing surface 12 on the outer surface of the block 11 that is in contact with the plate material 9, and as shown in FIG. , 0) in the case of a narrow elongated surface, and as the width becomes narrower, the pressing force is locally concentrated and strengthened, so it is appropriate to use them depending on various aspects.

An elastic body 13 made of urethane is inserted into a hole carved from the surface facing the suppressing surface 12 toward the suppressing surface without leaving a gap, and the elastic body 13 and the bottom surface of the groove 10 are connected to each other. Space adjustment material 1 using, for example, a washer with an appropriate thickness in between
4 to finely adjust the degree of protrusion of the suppression surface 12 relative to the surface of the mold 70.

As shown in FIG. 3, two urethane elastic bodies are buried in each size of the suppression block 11, and a hole 15 is provided in the middle part of the block between them in a direction transverse to the suppression direction.
The cross shaft 16 is inserted into the hole with a sufficient clearance, and since the base of the shaft 16 is fixed to the upper mold 7, the block 11 is supported by the shaft 16 and prevented from falling off.

A receiving seat 17 is provided on the opposite side of the mold on the opposite side on which the pressing force of the pressing surface 12 acts via the plate material 9.

In this investigation, as shown in the embodiment of FIG. 5, it is also possible to expose the surface of the block 1102 at the corner of the upper die 7 where it is required to be held down, and in this case, a cross shaft 16 is provided to prevent it from falling off. It is provided not only horizontally but also vertically.

The holding device according to the present invention can also be provided along the upper surface of the periphery of the lower die 8, as shown in the embodiment of FIG.
Furthermore, it is possible to install the suppression surface not only in a straight surface but also in a curved surface.

An elastic body 13 made of urethane is used as a space adjustment material such as a washer 14.
and the bottom surface of the groove 10, and the block 11 is adjusted in advance so that the suppressing surface 12 of the block 11 protrudes outward from the surface of the mold by approximately 1 to 20 degrees.

In this state, when the plate material 9 is compressed with a load of about 2 tons, for example, the plate material 9 is strongly compressed by the sealed urethane elastic body through the suppressing surface 12, and the plate material 9 is kept in a straight state. It is pressed properly and there are no scratches or wrinkles.

g4 Effects of the Invention The present invention is applicable to a pressing device for a press die that requires localized compression under conditions of, for example, a heavy pressure of about 2 tons and a minute displacement of about 1 to 1 taa. By inserting an elastic body 13 made of urethane into the hole, the above problem is solved, and the plate material can be straightened without forming a curved surface on the periphery of the plate material as in the conventional method. Since it is possible to press the periphery of the plate material, there is no waste on the periphery of the plate material and there is less scrap, and it has become possible to process with the smallest effective area of material, which not only reduces production costs but also reduces friction. It does not take up much space while waiting for transportation, allowing for extremely efficient work.

In addition, since urethane is a material with high wear resistance and oil resistance, it has a long service life and improves work efficiency accordingly.

Furthermore, since the presser by the device of the present invention does not cause scratches or wrinkles on the plate material, it is extremely advantageous for subsequent processing, such as spot welding.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention, FIG. 2 is an enlarged view of the main part of FIG. 1, and FIG. 3 is a longitudinal sectional view taken along the line 2-2. FIG. 3 is a cross-sectional plan view taken along line 3-3 in FIG. Fig. 4 is a cross-sectional view of essential parts showing various aspects of the pressing surface, Fig. 5 is a longitudinal cross-sectional view showing a second embodiment of the present invention, and Fig. 6 is a longitudinal cross-sectional view showing a third embodiment of the present invention. It is a front view. 7... Upper mold, 8... Lower mold, 9... Plate material, lO...
- Long groove, 11... Pressing block, 12... Suppressing surface. 13... Urethane elastic body, 14... Spacing adjustment material,
15... Hole% 16... Cross shaft, 17...
Ukeza. Patent applicant: Mamoru Sanne, patent attorney of Koldyo Kogyo Co., Ltd.

Claims (2)

[Claims] (1) It has a long groove carved along the position where pressing is required in the upper or lower mold, and is sized to fit within the groove, has a pressing surface on the outer surface, and is opposed to the pressing surface. A suppression block with a hole carved from the surface toward the pressing surface, and an elastic body made of urethane inserted into the hole without leaving any space. A presser device for press molds consisting of (2) A long groove carved along the position where pressing is required in the upper mold or lower mold, and a size that fits within the groove, and a pressing surface on the outer surface, and facing the pressing surface. A pressing hole in which a hole is carved from the surface to the pressing surface, an elastic body made of urethane inserted into the hole without any gap, and between the elastic body and the bottom of the groove. A gap adjustment material inserted, a cross shaft for preventing falling off that has a hole cut in the middle part of the block in a direction transverse to the suppression direction and is inserted into the hole with a clearance, and a cross shaft provided in the mold on the opposite side. A holding device for a press die, comprising: a seat for the pressing surface;