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With the improvement of current quality of life, hardware stamping parts have penetrated into various fields and are closely related to our lives. So what are the technical requirements for hardware stamping process? Below, Li Gao will introduce the main factors that affect stamping processing, including sheet metal, molds, equipment, and stamping oil.
1、 Raw Material Performance of Hardware Stamping Parts
1. Chemical analysis and metallographic examination
Analyze the content of chemical elements in the material, determine the grain size level and uniformity of the material, evaluate the level of free cementite, banded structure, and non-metallic inclusions in the material, and check for defects such as shrinkage and porosity.
2. Material inspection
Stamping parts are mainly made of hot-rolled or cold-rolled metal plate and strip materials. The raw materials of hardware stamping parts should have quality certificates, which ensure that the materials meet the specified technical requirements. When there is no quality certificate or for other reasons, hardware stamping parts factories can choose raw materials for re inspection as needed.
3. Forming performance test
Conduct bending tests and cupping tests on materials to determine the work hardening index and plastic strain ratio of the materials. In addition, the testing methods for the formability of steel plates can be carried out in accordance with the regulations for the formability and testing methods of thin steel plates.
4. Hardness testing
The hardness testing of hardware stamping parts adopts a Rockwell hardness tester. Small stamping parts with complex shapes can be tested using other testing instruments.
2、 Process requirements for metal stamping parts
1. When designing the structural shape of hardware stamping parts, simple and reasonable surfaces and their combinations should be used, while also minimizing the number of processed surfaces and processing area as much as possible.
2. Choosing a reasonable method for blank preparation in mechanical manufacturing can directly utilize profiles, casting, forging, stamping, and welding. The selection of blanks is related to specific production technical conditions, generally depending on production batch size, material properties, and processing possibilities.
3. The requirements for the formability of metal stamping are that in order to facilitate stamping deformation and improve the quality of the workpiece, the material should have good plasticity, low yield strength ratio, large plate thickness directionality coefficient, small plate plane directionality coefficient, and a small ratio of yield strength to elastic modulus of the material. The separation process does not require materials with good plasticity, but materials with a certain degree of plasticity.
4. Specify appropriate manufacturing accuracy and surface roughness. The cost of metal stamping parts will increase with the improvement of accuracy, especially in cases of high accuracy, where this increase is extremely significant. Therefore, high accuracy should not be pursued without sufficient evidence. Similarly, the surface roughness of metal stamping parts should also be appropriately specified based on the actual needs of the mating surface.