Metal plate local punching and edge wrapping connection mold and working method thereof

Abstract

The invention relates to a metal plate local punching and edge wrapping connection mold and a working method thereof. The mold comprises an upper mold structure and a lower mold structure; the upper mold structure comprises an upper mold assembly and an upper blank holder; the upper mold assembly comprises an upper mold module, a punch and an internal slide block; the upper mold module and the punch can move up and down in the upper blank holder; and the lower mold structure comprises a lower blank holder and a lower mold module. When the upper mold assembly moves down, the punch firstly trimsand bends an upper plate and punches and blanks a lower plate under cooperation of the lower mold module; then, the punch continuously moves down to bend the bent edge of the upper plate again through the internal slide block; and finally, the lower mold module and the upper mold module tightly press the bent edge of the upper plate and the lower plate to finish local punching and edge wrapping connection of the upper plate and the lower plate. The mold can perform single-edge, double-edge and four-edge wrapping connection of one position in metal plates, is not limited on the peripheral edges of the metal plates, and is simple and fast in the punching and edge wrapping connection process and excellent in flexibility.

Description

technical field [0001] The invention relates to a wrapping connection die, in particular to a partial punching and wrapping connection die of a metal sheet and a working method thereof. Background technique [0002] At present, lightweight has become the development trend of the automobile industry, which promotes the use of lightweight materials on the body, such as aluminum alloys and magnesium alloys. Due to the large differences in crystal structure and physical properties between dissimilar materials, if traditional spot welding is used for connection, problems such as hard and brittle interfaces, electrochemical corrosion, deformation and stress are prone to occur, so many new types of materials have been born. Joining process, such as self-piercing riveting, rivetless joining, hemming joining, etc. Among them, the hemming connection is a process of connecting the inner and outer sheets together by bending and flattening the flanging sheets, which is often used to ass...

AI Technical Summary

Problems solved by technology

[0003] At present, the commonly used hemming devices are mainly divided into two categories, one is the press and the hemming die, and the other is the mechanical arm and the pressure wheel. The former is more versatile but lacks flexibility, and the latter is more specific but expensive. High, and both types of devices occupy a large area

At the same time, the two types of devices also have certain limitations when connecting metal sheets. They can only perform hemming connections on the edges of the sheets, but cannot punch holes at a certain point (position) inside the sheet and realize this point. hemming connection

Images