What technical conditions should raw materials of stamping parts meet before processing and production

When choosing the raw materials of stamping parts, the metal stamping manufacturers should check whether these raw materials meet the requirements of relevant metal material standards, whether they meet the technical standards such as gb710-65 technical conditions for high quality carbon structural steel plate, gb2517-81 hot continuous rolled steel plate and strip for general structure, gb2521-81 cold rolled electrical steel strip, etc;

1. The raw materials of stamping parts shall have quality specifications to ensure the specified technical requirements of material composition. If there is no quality specifications or other reasons, the stamping parts manufacturer can return or replace the raw materials according to the regulations;

2. After purchasing the raw materials, the stamping manufacturer shall carry out chemical analysis and metallographic inspection on the raw materials of stamping parts; analyze the content of chemical elements in the materials, determine the grade and uniformity of the material grain size, evaluate the grade of free cementite, banded structure and non-metallic inclusion in the materials, and check the defects such as shrinkage cavity and looseness of the materials; after passing the inspection, punch the raw materials Production;

3. Mechanical properties of stamping materials are tested, including tensile strength, yield strength, yield ratio, elongation, reduction of area and Rockwell hardness;

4. Forming performance test, bending test, cupping test, work hardening index and plastic strain ratio of stamping parts;

5. Determination of electromagnetic properties of stamping materials and adhesion of coating and coating.