JPS6149734A - Supporting method of press die - Google Patents

Abstract

PURPOSE:To increase the production efficiency by fixing an upper die to a slide, and on the other hand, supporting a lower die in a floatable state on a bolster, aligning between both the upper die and the lower die through an alignment means, and also executing a press work. CONSTITUTION:A U-groove 12 is formed on the outer edge of a lower die 6, and also a T-groove 10 is provided on a bolster 7. When setting the die, both the grooves 10, 12 are joined together, and a clamping tool 13 is inserted and attached in a state through a spring. In this way, the lower die 6 is supported so as to be floatable on the bolster 7. Accordingly, whenever a press process is executed, the lower die is guided by an alignment means consisting of a guide post 5 and a guide bush 9, aligned automatically, as it were, and the lower die 6 can be adapted easily to an upper die 1. According to this method, a maintenance of alignment becomes unnecessary, and the production efficiency increases.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for supporting a press mold, and particularly to a method for supporting a press mold that can maintain the original processing accuracy even after long-term use of the mold.

[Conventional technology]

For example, a press die as shown in FIG. 7 is used to perform shearing operations such as drilling, trimming, and blanking on a workpiece using a press machine. The upper mold 1 is fixed to the lower surface of a slide 2 of a press machine with bolts (not shown). This upper mold 1 includes 1 sectional die for trimming the workpiece, 3. A plurality of guide posts 5 are attached in addition to a pad 4 for holding down the work being trimmed. on the other hand,
The lower die 6 is fixed on the polster T of the press machine with a lower die clamp 8.

This lower mold 6 has an upper,
A guide bush 9 for aligning the lower molds 1 and 6 is fixed, and is attached to the polster 7 in the following procedure.

First, the upper mold 1 is gradually lowered by the slide 2, the guide post 5 is fitted into the guide bush 9, and both molds 1.
6 accurately. Next, insert the port 8a into the T groove 10 of the polster 7 and the U groove on the outer edge of the lower mold, and tighten the seat 8b.
8c) firmly to secure it in place.

After accurately aligning the upper and lower dies 1 and 6 and firmly fixing them to each other, the workpiece is pressed (trimming in the example shown), so initially high processing accuracy is achieved. It is often used for processing items that require dimensional accuracy, such as automobile parts.

[Problem that the invention seeks to solve]

However, in this conventional press mold support method, the lower mold 6 was initially aligned and fixed on the polster 7, which resulted in high initial accuracy, but at the same time it was difficult to use. Machining accuracy tends to decrease. Therefore, there was a problem in that the frequency of maintenance increases as the period of use increases. This is due to variations in the dynamic parallelism of the slide 2 as it descends during the pressing process, as well as uneven load when shearing the workpiece, causing deformation such as curling in the mold.

This is because the upper and lower molds 1.6 come into contact with each other and cannot be completely engaged. Therefore, as the press work is repeated, cut edges will gradually form on the product, which may cause so-called star marks, etc., so it is necessary to release the fixation of the lower die 6 and correct the alignment as appropriate. Required.

[Means for solving the problem] This invention focuses on the above-mentioned problems and attempts to maintain the original press working accuracy without reducing it. This method of supporting a press mold is characterized in that the lower mold 6 is movably supported on the polster 7, and the workpiece is pressed while aligning the two molds via an alignment means 11.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

Note that the same parts as in the prior art are given the same reference numerals.

The upper die 1 is fixed to the slide 2 of the press machine 2 as in the conventional case, whereas the lower die 6 placed on the polster T of the press machine is not fixed as in the conventional case.
It is movably supported. Of course, the relative positions of both the upper and lower molds are aligned by the guide post 5 and the guide bush 9 as alignment means 11. 2 to 4 show the support structure of the lower mold 6, 12 is a U-groove formed on the outer edge of the lower mold, 10 is a T-groove formed in the polster 7, and when the die is set, Align both grooves 10 and 12 and insert the fastener 13.

The fastener 13 (Fig. 3) connects the head 13b of the port 13a with T.
The flange-equipped square washer 13C is inserted into the groove 10, and its protruding flange 13d is inserted into the stepped portion 1 formed in the tightening seat 14 of the lower mold U groove 12.
4a, screw together the oak (13f) via the spring 13e while maintaining vertical clearance, and secure with the cotter pin 13q.

The function of the fastener 13 is only to prevent the lower mold 6 from rising together with the upper mold 1 even if the upper mold 1 and the lower mold 6 bite, and to prevent the lower mold 6 from rising together with the polster 7. It is not something that is fixed. Spring 13e and square washer Noba 1
3d, the fastener 13 is damaged by the lower mold 6 due to vibration during press working.
Prevent it from coming off. The strength of the spring 13e may be such that the square washer 13c can be easily lifted with one hand. The lower mold 6 moves the top of the pole star T to the second
The alignment means 11 can be freely moved forward, backward, left and right as indicated by the arrow mark A1 in the figure, and therefore each time the press process is performed, the alignment means 11
Since the workpiece is self-aligned and can easily fit into the upper die 1, even if the press operation is repeated, misalignment, twisting, and cracks will occur on the workpiece.

It never happens.

Furthermore, since the fastener 13 can be installed and removed with one touch, unlike the conventional complete tightening method, setup time is also significantly reduced.

Note that the alignment means is not limited to the guide post and guide bush of the embodiment.

Figure 5.6 shows another embodiment.

FIG. 5 is a plan view of the floating support structure for the lower mold 6 in this embodiment, and FIG. 6 is a sectional view thereof.

In the figure, 20 is an abutting groove formed on the outer edge of the lower mold 6;
1 is for hitting this V groove 20.

The first guide pin 22 for positioning driven into the polster 7 is a second guide pin also driven into the polster 7. Reference numeral 23 denotes a floating part provided on the lower die 6 to receive the second guide pin 22, and a metal bushing 24 having a through hole through which the second guide pin 22 is inserted, and a floating part fitted to the outer periphery of this bushing 24. For example, urethane rubber J
(It is equipped with a cushion member 25 made of an elastic body, and a presser lid 26 bolted to the lower mold 6 to press the bush 24.

When installing the mold, the lower mold 6 carried by a crane is first positioned by abutting its abutting groove 20 against the first guide bin 21, and then lowered onto the polster 7.

At this time, the second guide pin 22 is fitted into the bushing 24 of the idler part 23. Next, the upper mold 1 is fixed to the slide 2. During press working, self-centering is performed by the alignment means 11, as in the first embodiment. Even if a minute displacement occurs between the upper die 1 and the lower die 6 during pressing, the displacement is absorbed by the cushion member 25. Since the lower die 6 is self-centering while freely moving within the movable range of the cushion member 25, there is no risk of forming cracks or the like on the product.

〔Effect of the invention〕

As explained above, according to the present invention, the upper die is fixed to the press machine, while the lower die is left in a free state without being forcibly fixed, and press processing is performed while aligning the position through the alignment means. As a result, the machining accuracy at the time of initial use can be maintained, and the conventional alignment maintenance is no longer necessary, greatly increasing production efficiency.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of one embodiment of the present invention, and FIG. 2 is a partial perspective view of the lower die mounting structure of FIG. 1. Fig. 3 is an enlarged perspective view of the fastener, Fig. 4 is a sectional view showing the mounting state of the fastener shown in Fig. 3, Fig. 5 is a plan view of another embodiment, and Fig. 6 is the Ml shown in Fig. 5. -Vl sectional view, and Figure 7 is a side sectional view showing the support structure of the conventional push-V type. 1... Upper die 2... Slide 6・・・・・・Lower mold 7・・・・・・Pollster 11・・・Alignment means Fig. 7 Fig. 2

Claims (1)

[Claims] A support for a press die, characterized in that the upper die is fixed to a slide, the lower die is movably supported on a polster, and a workpiece is pressed while aligning the two dies through an alignment means. Method.