JPS625781Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shock absorber for press dies interposed between press dies of a press machine.

For example, the stud bolt that supports the cushion material is passed through between the drawing die and the pad.
The press machine disclosed in Japanese Patent No. 145,685 has a problem in that the drawing die and pad must be separated each time a worn cushion material is replaced.

On the other hand, as shown in Fig. 1, a press machine in which a stud bolt b, which is shorter than the distance between the drawing die and the pad, is screwed onto the pad d, requires the drawing die and pad d to be separated. This type of spring has the advantage of being able to replace the urethane spring a, but on the other hand, the inner surface of the urethane spring a tends to come off from the bolt b during press work, especially when the spanner hook formed at the top of the spring a is easily removed. This has the problem that it comes into contact with c and is easily abraded.

In view of these problems, the present invention aims to provide an improved shock absorber for press molds that can reduce wear on urethane springs and stably hold them.The details are shown below. This will be explained based on an example.

Figures 2 and 3 show an embodiment of the present invention, in which reference numeral 1 is formed shorter than the distance between the drawing die 5 and the forming pad 4, and one end is threaded in the form of a cantilever. The stud bolt is a characteristic part of the present invention, and a spherical head 1a having a diameter larger than the diameter of the bolt 1 body is formed at the top of the stud bolt, and below this spherical head 1a, A spanner hook 1b for screwing the bolt 1 onto the forming pad 4 is cut out. Two urethane springs 2, 2 for absorbing shock between the drawing die 5 and the forming pad 4 are fitted into the stud bolt 1 with a separate plate 3 in between, and these springs are connected to the center hole 2a of the upper urethane spring 2. It is fixed on the bolt 1 by elastic engagement with the spherical head 1a of the bolt 1.

In the embodiment described above, when the press machine operates, the urethane springs 2, 2 expand and contract with this operation and repeatedly come into contact with the stud bolt 1. Especially the center hole 2 of the upper urethane spring 2
A is easily damaged because it comes into contact with the top of the bolt 1, but since this part has a spherical shape, damage is prevented as much as possible, and contact with the edge of the spanner hook 1b also occurs at the top This is prevented by the bulging head 1a.

In the above embodiment, two urethane springs 2, 2 are used from the viewpoint of durability and pressure resistance, but the present invention can also be applied to a structure using one urethane spring. Needless to say.

As described above, according to the present invention, in a type of pad in which a stud bolt is screwed in a cantilever shape on a pad for press molding in order to facilitate the installation of a urethane spring, the center hole of the urethane spring is damaged. Since a large diameter spherical part is provided at the top of the bolt, which is easy to use, this spherical surface can greatly reduce wear on the center hole, and also avoid contact with the edge of the wrench hook, thereby preventing damage. can be prevented. Furthermore, even if the center hole part that comes in contact with the large diameter part wears out due to long-term use, the worn part forms a concave shape and engages with the large diameter part of the top of the bolt, so urethane is used during maintenance and inspection. It becomes possible to completely prevent the spring from falling off.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing an example of a conventional device;
The figure is a sectional view of a device constituting an embodiment of the present invention, and FIG. 3 is a sectional view showing the state in which the same device is used. 1... Stud bolt, 1a... Spherical head, 2
...Urethane spring, 3...Separate plate,
4... Pad for molding, 5... Drawing mold.

Claims (1)

[Claim for Utility Model Registration] In a device in which a stud bolt formed shorter than the distance between the pad and the drawing die is threaded onto the pad in a cantilever shape, a urethane spring is attached to the center of the stud bolt at the top of the stud bolt. 1. A shock absorber for a press type, characterized in that a spherical large-diameter part that can be inserted into a hole is provided, and a spanner hook part for screwing in a stud bolt is cut in the lower part of the spherical large-diameter part.