Metal stamping parts are the most commonly used parts in metal processing and mechanical manufacturing. Stamping processing is 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) sheet metal materials, such as carbon steel plates, alloy steel plates, spring steel plates, galvanized plates, tinned plates, stainless steel plates, copper and copper Alloy plate, aluminum and aluminum alloy plate, etc. Today introduces the slip line method of metal stamping parts:
The basic assumption of 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 not necessary to consider boundary conditions such as deformation force, stress-strain relationship and boundary friction, and realize the mapping of workpiece to blank according to certain assumptions.
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, bending parts, or stamping parts composed of these simple parts). In general, the methods for developing free-form surfaces of plate parts from experience are all methods of improvised nature, and their accuracy is affected by many factors such as the richness of the user’s experience, the empirical formula used, and the selection of specific process parameters. Its accuracy needs to be further improved.
The simulation method is to simulate the metal flow of the sheet flange based on the similarity of the mathematical description of many physical problems, through the mathematical similarity theory, and the model composed of other physical media under certain assumptions. 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 stamping parts are mainly hot-rolled or cold-rolled (mainly cold-rolled) sheet metal materials, such as carbon steel plates, alloy steel plates, spring steel plates, galvanized plates, tin plates, stainless steel plates, copper and copper alloys Plate, aluminum and aluminum alloy plate, etc. The hardness test of metal stamping parts adopts Rockwell hardness tester. Small stamping parts with complex shapes can be used to test the surface is very small, can not be tested on the ordinary desktop Rockwell hardness tester.