Convex-point-free perforated stamping connection method for sheets different in material and large in thickness difference

Abstract

Provided is a convex-point-free perforated stamping connection method for sheets different in material and large in thickness difference. A sheet which is low in material yield strength and small in thickness (namely an upper sheet) is put on a sheet which is large in yield strength and large in thickness (namely a lower sheet); a pre-manufactured hole is machined in the to-be-connected position of the lower sheet and can be in a mode of a big-end-down inverted cone or a big-end-down step hole or threaded hole. In the connection process, the material in the connected position of the upper sheet is downwards extruded through an upper mold of a stamping connection mold, so that the extruded material deforms plastically and flows into the pre-manufactured hole of the lower sheet to form a nested structure. The upper mold is a cylinder, the lower end of the cylinder is shaped like a section of inverted frustum thinned gradually, and the working face of a lower mold can be a plane and a big-end-down cone frustum. The method can achieve stamping connection between two layers of sheets which are large in material yield strength and thickness difference, no connection convex point exists in the connection position, and the air tightness requirement of the connection portion can be met.

Description

technical field [0001] The invention belongs to the field of connection and forming of metal sheets, and in particular relates to a punching connection method with no bumps and holes between sheets with different materials and large thickness differences. Background technique [0002] The traditional connection methods between sheet metal parts include welding, riveting, screw connection and glue connection, etc., and these methods have their own advantages and disadvantages. With the development of society, especially for considerations of economy, environmental protection and safety, people have gradually developed some new sheet metal connection technologies such as mechanical deformation connection to make up for the shortcomings of traditional methods. Stamping connection (also known as "stamping deformation connection") is a mechanical deformation connection method that uses the local plastic deformation of metal sheets to nest and connect two or more layers of sheets....

AI Technical Summary

Problems solved by technology

Among these stamping connection methods, the punching connection method with holes proposed by Lee et al. can realize the connection between two-layer boards with a large difference in material yield

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