Guide structure for fine blanking die sets

Abstract

The invention relates to a guide structure for fine blanking die sets. The guide structure comprises an upper die base, a lower die base, a guide bush, a bushing, a guide pillar, a flange and a screw, the guide pillar is in taper fit with the inner surface of the bushing, and the guide pillar and the lower end face of the bushing are mutually fixed through the screw and the flange. The guide structure is beneficial to mounting of dies and sharpening of die points, service life of the dies is prolonged, and working is safe and reliable. In the adopted guide structure for the fine blanking die sets, a press-in end of the guide bush is identical to an outer cylindrical surface of a guide end in diameter, the surface of the guide sleeve is free of steps and tool withdrawal grooves, and accordingly the guide structure is easy to process and mount and firm, and the guide bush is good in quality and capable of guaranteeing excellent guide precision.

Description

technical field [0001] The invention relates to an automobile die, in particular to a guide structure for a fine blanking die frame. Background technique [0002] The guide device is an important component of the fine blanking die base. It refers to the installation of a kinematic pair mainly composed of guide sleeves, guide posts and other parts on the upper and lower die bases. Under the constraints of the guide device, when the upper and lower molds move relative to each other, they always move in a correct direction, so as to achieve the purpose of precision stamping. [0003] The installation of the guide column of the traditional fine-blanking die base and the lower die base is mostly fixed by the interference fit of the straight hole. The end outer circle is smaller than the guide end outer circle, forming two stepped outer circles. Although this connection scheme has the advantage of being convenient to manufacture, since the mold is a fragile tool, it is often nec...

AI Technical Summary

Problems solved by technology

Although this connection scheme has the advantage of being convenient to manufacture, since the mold is a fragile tool, it is often necessary to repair the mold in order to ensure the accuracy of the mold. It is extremely inconvenient to repair and install the mold by replacing the installation guide post and guide sleeve. It is not easy to maintain high precision after disassembly and assembly of the mold. At the same time, the diameter of the pressing end of the guide sleeve is different from that of the outer cylindrical surface of the guide end, forming a step on the surface, and the interface has a deep relief groove, which increases the processing capacity. Difficult and prone to cracks after heat treatment, affecting the quality of the guide sleeve

[0004] Another part adopts a detachable guide post. After searching the existing technical documents, it is found that the Chinese patent application number is 200820083071.2, and the title of the invention is: a detachable guide post formwork. This new patent provides a A detachable guide post formwork, the guide post is connected with the bushing by screws, and the bushing is connected with the lower formwork by screws, the guide post can be disassembled freely, but there are the following disadvantages: first, because the bushing is connected by screws, the guide post The coaxiality error of the column and the hole of the lower die seat is relatively large, and the positioning is not accurate, which affects the working accuracy of the fine punching die

Secondly, since the bushing is connected by screws, the screw loosens due to the vibration of the press during the stamping process, and it is easy to separate the guide post from the lower die base, causing accidents

Thirdly, since the bushing is connected by screws, several threaded holes must be opened on the flange of the bushing, which will inevitably make the size of the bushing too large, resulting in a smaller space for installing the convex and concave molds.

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