Structure used for eliminating reverse ejection action of lower pressing plate of progressive die

Abstract

The invention belongs to the field of die manufacture and particularly provides a structure used for eliminating the reverse ejection action of a lower pressing plate of a progressive die. The structure comprises an upper pressing plate and the lower pressing plate, wherein friction blocks are mounted on two opposite sides of the lower pressing plate respectively, a feeding device is connected with the end surface, opposite to the lower pressing plate, of each friction block, and the feeding device can drive the friction block on the same side to transversely reciprocate and realizes tight press connection of the friction block and the end surface of the lower pressing plate; each feeding device comprises a swing block and a slider, the swing block is mounted in a swing block fixing seat which is arranged on the side of the corresponding friction block, a slider fixing seat is arranged on one side, opposite to the friction block, of the swing block fixing seat, the slider is mounted inthe slider fixing seat, an opening is formed in the end part, located on the same side with the swing block, of the slider fixing seat, the slider extends out from the opening, and a nitrogen springis mounted at the end part, located in the slider fixing seat, of the slider.

Description

technical field [0001] The invention belongs to the field of mold manufacturing, in particular to a structure for eliminating the back-up effect of a presser plate under a progressive die. Background technique [0002] The progressive die is composed of multiple stations, each station completes different processing in sequence, and completes a series of different stamping processing in one stroke of the punch. After one stroke is completed, the punch feeder moves the material forward according to a fixed step, so that multiple processes can be completed on a set of molds, generally punching, blanking, bending, trimming, stretching. ,and many more. [0003] In the process of the progressive die in the stretching forming station, due to the influence of the molding time and the difference in the opening time of the upper and lower dies, the punch and the pressing plate will rise at the same time when the upper and lower dies are closed and opened. There is a time difference ...

AI Technical Summary

Problems solved by technology

[0003] When the progressive die is in the stretch forming station, due to the influence of the forming time and the difference in the mold opening time of the upper and lower molds, the punch and the clamping plate will rise at the same time when the upper and lower molds are closed and the mold is opened. There is a time difference in the rise of the male, and the force of the lower clamping plate is relatively large, and the rising speed of the lower clamping plate is greater than that of the upper clamping plate, which leads to the so-called reverse top phenomenon.

At this time, the upper pressing plate has not yet separated from the product, and the lower pressing plate will force the product up when it rises, causing serious wrinkles on the product

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