Precision stamping parts stamping die knowledge

Precision stamping parts stamping die knowledge

The metal stamping die processing includes punching, bending, deep drawing, forming, finishing and other processes. Precision stamping parts are the most commonly used parts in metal processing and mechanical manufacturing. Precision stamping processing is a processing method that uses molds to separate or shape metal strips. Its application range is very broad. The hardness test of the metal stamping die adopts Rockwell hardness tester. Small precision stamping parts with complex shapes can be used to test the plane is very small, can not be tested on the ordinary desktop Rockwell hardness tester.

　 The main purpose of the hardness test of stamping die materials is to determine whether the degree of annealing of the purchased metal sheets is suitable for the subsequent precision stamping parts processing. Different types of stamping parts processing techniques require plates of different hardness levels. The aluminum alloy plate used for the processing of precision stamping parts can be tested with a Webster hardness tester. When the material thickness is greater than 13mm, the Barcol hardness tester can be used. The pure aluminum plate or the low hardness aluminum alloy plate should use the Barcol hardness tester.

Common defects of metal stamping dies include: deformation, burrs, etc. of precision stamping parts; cracks, warpage, surface scratches, corner deformations of bent parts, etc.; flange wrinkles of drawn parts, and wrinkles of drawn walls , Deep drawing wall damage, tearing, etc.; flanging cracks, uneven bulging, etc.

Methods to prevent and eliminate defects are: mold design should have a reasonable convex and concave mold gap value, fillet radius and processing accuracy. When designing a bending die, effective measures should be taken to reduce the springback, and the amount of springback should be subtracted from the mold; reasonable rounded corners should be designed to prevent bending cracks. When drawing, use a blank holder to prevent wrinkles, and the pressure should be moderate; use proper lubrication to reduce the drawing resistance to prevent the mold from sticking or pulling the workpiece through.