Specific requirements for stamping processability of metal materials

Stamping products are made of various materials. Therefore, the materials should first have performance in use to ensure the function of the product. In addition, the material should also have suitable process performance. The stamping parts obtained by stamping processing methods should be suitable for the characteristics of the stamping process in terms of structural shape, dimensional accuracy and other requirements. The materials constituting the stamping parts should also be suitable for the characteristics of the stamping process and suitable for accepting stamping processing. The stamping process requirements for metal materials include the following aspects: 1. The chemical composition of the material: Generally speaking, the lower the carbon content of steel, the lower the impurity content, the better its plasticity and the lower its hardness. Therefore, low-carbon steel and low-alloy steel (with low carbon content) are widely used as stamping materials. 2. The surface quality of the material: Most of the materials of the stamping parts are steel plates, and the most common use of thin plates. The state has certain regulations and requirements for the surface quality of steel plates. The surface of the material must be smooth and smooth, free of scratches, impurities, pores and shrinkage; the section of the material must be free of delamination and no obvious mechanical damage; the surface of the material must be free of rust spots, oxide scales and other attachments. In the stamping process, the material with the best surface quality can obtain stamping parts with a smooth surface and higher quality, and it is not easy to break during the deformation process, and it is not easy to damage the mold. 3. Material organization: The mechanical properties of metal materials not only depend on their chemical composition, but also on their organizational structure. Generally speaking, the fine structure of the metal, the greater the plasticity, which is beneficial to the deformation of the material during stamping. However, if the structure of the metal is too fine, the strength and hardness of the material will increase. 4. The mechanical properties of the material: 　Considering the process performance of the material, the plastic index of the material is of great significance. For the deformation process, the better the plasticity and the greater the allowable degree of deformation of the material, the better the manufacturability of the material. For the separation process, the material should have appropriate plasticity. If the plasticity is too high, the material is too soft, and the edges of the blanking parts are prone to produce more burrs, and the dimensions are not easy to reach the required accuracy. If the plasticity is too low, the material is too hard and brittle, and the mold life will be affected. 5. Material thickness tolerance: 　During stamping processing, the requirements for material thickness deviation are relatively strict. This is because a certain die gap is suitable for stamping materials with a certain thickness. If the same die gap is used to stamp materials with large thickness differences, the quality and accuracy of the resulting workpiece will be reduced, and the die will also be easily damaged. Especially in the drawing, flanging and bending process, due to the uneven thickness of the material, it may lead to the production of waste. In the reshaping of large stamping parts, the press can even be damaged. Some factories also stipulate the length and width tolerances of cut strips. These regulations are to ensure that the stamping and blanking can be carried out according to the designed layout, and no material will be wasted. At the same time, it is also to ensure that the strip is positioned correctly on the die, and the stamped parts obtained after stamping have no missing edges or missing corners. Recommended article: Talking about the necessity of metal tensile test Previous article: Issues that must be paid attention to when handling scrap metal stamping parts