What are the technical requirements for the metal stamping process?

1. The raw material properties of metal stamping parts 1. Chemical analysis and metallographic inspection analyze the content of chemical elements in the material, determine the level and uniformity of the material grain size, and evaluate the free cementite, band structure and non-metallic inclusions in the material Check the material shrinkage, porosity and other defects. 2. Material inspection The materials of stamping parts are mainly hot-rolled or cold-rolled metal plate and strip materials. The raw materials of metal stamping parts should have a quality certificate, which ensures that the materials meet the specified technical requirements. When there is no quality certificate or due to other reasons, the metal stamping parts factory can select raw materials for re-inspection as needed. 3. Formability test Carry out bending test and cupping test on the material to determine the work hardening index and plastic strain ratio of the material. In addition, the steel forming performance test method can be carried out in accordance with the thin steel forming performance and test method. 4. Hardness testing The hardness testing of metal stamping parts adopts Rockwell hardness tester. Small stamping parts with complex shapes can be tested with other testing instruments. 2. Process requirements of metal stamping parts 1. When designing the structural shape of the parts, the metal stamping parts adopt simple and reasonable surfaces and combinations, and at the same time, try to minimize the number of processed surfaces and the smallest processing area. 2. Choose a reasonable method of blank preparation in mechanical manufacturing, which can directly use profile, casting, forging, stamping and welding. The selection of the blank is related to the specific production technical conditions, and generally depends on the production batch, material properties and processing possibilities. 3. The requirements of metal stamping forming performance, in order to facilitate stamping deformation and the improvement of the quality of the parts, the material should have good plasticity, small yield ratio, large plate thickness directivity coefficient, small plate directivity coefficient, and material yield The ratio of strength to elastic modulus is small. The separation process does not require a material with good plasticity, but a material 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 the case of high accuracy, this increase is extremely significant. Therefore, high accuracy should not be pursued when there is no sufficient basis. Similarly, the surface roughness of metal stamping parts should also be appropriately specified according to the actual needs of the mating surface. Third, the selection principle of metal stamping oil 1. Silicon steel plate: Silicon steel plate is a material that is relatively easy to punch. Generally, for the easy cleaning of the finished product, low-viscosity punching oil will be selected on the premise of preventing punching burrs. 2. Carbon steel plate: Carbon steel plate is mainly used for low-precision processing such as protective plates of some mechanical equipment, so the first thing to pay attention to when selecting stamping oil is the viscosity of the drawing oil. 3. Galvanized steel sheet: Galvanized steel sheet is a welded steel sheet with a hot-dip galvanized or electro-galvanized layer on the surface. Because it reacts chemically with chlorine-based additives, you should pay attention to the white rust that may occur in the chlorine-based punching oil when selecting punching oil. problem. 4. Copper and aluminum alloy plates: Because copper and aluminum have good ductility, when selecting stamping oil, you can choose stamping oil that contains oily agents and good sliding properties. Avoid using chlorine-containing added stamping oil, otherwise the stamping oil will corrode Discoloration of the surface appears. 5. Stainless steel: Stainless steel is a material that is prone to work hardening, and it is required to use drawing oil with high oil film strength and good sintering resistance. Generally, stamping oil containing sulfur and chlorine compound additives is used to avoid problems such as burrs and cracks on the workpiece while ensuring the performance of extreme pressure processing. What are the technical requirements of the metal stamping process are described in detail above. The processing technology of metal stamping parts is relatively complicated. In order to ensure that the performance of metal stamping parts can meet the requirements of use, it is necessary to follow the corresponding process requirements to ensure the feasibility of production.