Hardware stamping parts are the most commonly used parts in metal processing and mechanical manufacturing. Stamping processing is the most common one in hardware processing, a processing method that uses molds to separate or shape metal strips. Its application range is very broad. The materials processed by metal stamping parts are mainly hot-rolled or cold-rolled (mainly cold-rolled) metal sheet and strip materials, such as carbon steel plate, alloy steel plate, spring steel plate, galvanized plate, tin plate, stainless steel plate, copper and copper Alloy plate, aluminum and aluminum alloy plate, etc. Today we introduce the slip line method of metal stamping parts:

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The basic assumption of the slip line method is: the thickness of the sheet flange is constant, and it is in a plane strain state, the material is isotropic, without hardening, and does not consider the influence of frictional force distribution on plastic flow. There are three common basic methods.

Geometric mapping method:

This method was first proposed by R. Sowerby et al. They believe that it is possible to realize the mapping of workpieces to blanks based on certain assumptions without considering boundary conditions such as deformation force, stress-strain relationship and boundary friction.

Experience method:

This method is mainly based on some empirical calculation formulas, so its application range is affected. It is mainly applied to developable stamping parts with relatively simple shapes (such as rotating parts, curved parts, or stamping formed by combining these simple parts Pieces). In general, the method of unfolding plate-like free-form surfaces by experience in the processing of stamping parts in hardware processing is a method of improvised nature, and its accuracy is affected by the richness of the user’s experience, the empirical formula used and the specific process parameters. The accuracy of selection and other factors needs to be further improved.

Simulation method:

The simulation method is based on the similarity of the mathematical descriptions of many physical problems under certain assumptions, through the mathematical similarity theory, and the use of models composed of other physical media to simulate the metal flow of the sheet flange. Laplace and Poission equations are widely used in sheet metal forming.

Stamping processing includes punching, bending, deep drawing, forming, finishing and other processes. The materials processed by metal stamping parts are mainly hot-rolled or cold-rolled (mainly cold-rolled) metal sheet and strip materials, such as carbon steel plate, alloy steel plate, spring steel plate, galvanized plate, tin plate, stainless steel plate, copper and copper Alloy plate, aluminum and aluminum alloy plate, etc. The hardness test of metal stamping parts adopts Rockwell hardness tester. Small, stamped parts with complex shapes can be used to test very small planes and cannot be tested on ordinary desktop Rockwell hardness testers.