7 suggestions for the selection of stamping materials

There are many options for stamping materials, and if the performance of the material and the processing procedures can be considered together, the stamping process can be continuously improved, which is conducive to the precision, beauty, and durability of the product. The benefits are obvious. How do you select materials for stamping parts processing? 1. Tensile parts should not be made of materials with a small strain hardening index. The strain hardening index has a very close relationship with the forming performance of the metal plate. According to the plastic deformation limit theory, the maximum elongation strain when the sheet is intensively stretched is twice that of uniaxial stretching. Under normal circumstances, the material will rupture immediately after the necking is concentrated. Therefore, the larger the strain hardening index of the material, the stronger the ability of the material to resist local fracture, the plastic strain distribution tends to be uniform, and the peak strain is lower. Therefore, it is not advisable to use materials with a low strain hardening index in molded parts with elongation as the main component. 2. Compression forming process should not choose materials with poor stability. In compression forming, the deformation zone is mainly composed of compression stress and compression strain to withstand compression deformation. The sheet is prone to instability and wrinkles under the action of compressive stress. In order to improve the stability of plastic deformation, it is not appropriate to choose materials with poor resistance to instability. 3. Materials with poor plasticity should not be used in the stretching process. Materials with low elongation should not be used in the stretching process. The better the plasticity of the material, the higher its uniform elongation, which means that between stable deformation and uniform deformation Perform stretch forming. 4. Hardened materials should not be used in the spinning process. Common spinning materials are mainly pure aluminum, low-carbon steel and stainless steel, of which low-carbon steel and stainless steel account for more than 60%. For ordinary spinning, soft materials with good plasticity, low yield point, less impurities, and uniform structure should be used. 5. High-strength and low-plasticity materials should not be used in the cold stamping process. High-strength and low-plasticity materials should not be used in the cold stamping process to avoid increasing deformation resistance and crack resistance. The requirements for cold stamping isometric forming of materials are: the material should have high plasticity, low yield point and low work hardening sensitivity. Commonly used cold stamping materials are pure aluminum and aluminum alloys, copper and copper alloys, low carbon steel, medium Carbon steel, low alloy steel, etc. Products stamped with this material have a smooth surface, dimensional accuracy and can withstand greater pressure. One-time plastic deformation, punch out products with complex shapes. 6. High elastic materials should not be used in the bending process. Steel for stamping and bending needs to have good plasticity, low yield strength and low elasticity. The steel with good plasticity is not easy to bend and crack during the bending process. Its low-yield, high-strength, low-elasticity steel has small springback deformation after bending and it is easy to obtain accurate bending shapes. 7. Materials with poor plasticity should not be used for elongation. During the stamping process, flaring, reaming, bulging, bending, eversion and partial stretching are extensional deformations. Since the deformation zone is mainly subjected to the tensile deformation of normal stress and normal strain, the material in the deformation zone is prone to excessive elongation. When the elongation exceeds the ultimate elongation of the material, it is easy to break, so it is not suitable to use a material with poor plasticity in the process of forming the elongation. [Related recommendation] Learn more: What are the methods for polishing the surface of stainless steel? Learn more: Manufacturing characteristics of automotive stamping parts molds Learn more: Points to note in the design of continuous stamping dies