Common materials and selection of continuous stamping dies

1. Commonly used materials for stamping 　　 The most commonly used materials in stamping production are metal materials (including ferrous metals and non-ferrous metals), but sometimes non-metallic materials are also used. Among them, ferrous metals mainly include ordinary carbon structural steel, high-quality carbon structural steel, alloy structural steel, carbon tool steel, stainless steel, electrical silicon steel, etc.; non-ferrous metals mainly include pure copper, brass, bronze, aluminum, etc.; non-metallic materials There are cardboard, laminate, rubber board, plastic board, fiberboard and mica.　　The supply status of metal materials for stamping is generally various specifications of sheets and strips. Sheet material can be used for the production of engineering molds, strip material (coil material) is used for the production of continuous molds, and can also be used for the production of engineering molds. The size of the sheet is large, which can be used for the stamping of large parts, and the sheet can be cut into strips according to the layout size and used for the stamping of small and medium-sized parts; strips (also called coils) have various specifications of width , The unfolded length can reach tens of meters, and it is supplied in rolls, which is suitable for automatic feeding of continuous mold mass production.　　 Regarding the grades, specifications and performance of various materials, please refer to relevant manuals and standards.　　2. Reasonable selection of stamping materials 　　The selection of stamping materials should consider the use requirements of stamping parts, stamping process requirements and economy.　　(1) Reasonable selection of materials according to the use requirements of the stamping parts. 　　The selected materials should enable the stamping parts to work normally in the machine or components and have a certain service life. For this reason, the selected material should meet the corresponding strength, stiffness, toughness, corrosion resistance and heat resistance requirements according to the use conditions of the stamping parts. (2) Reasonable selection of materials according to the requirements of the stamping process. For any kind of stamping parts, the selected material should be able to form a qualified product that will not crack or wrinkle stably according to the requirements of the stamping process. This is the most basic and most important The material selection requirements. For this reason, the following methods can be used to select materials reasonably.　　①Try punching. According to previous production experience and possible conditions, select several sheets that can basically meet the requirements of stamping parts for trial punching, and finally choose the one that has no cracks or wrinkles and has a low rejection rate. The result of this method is relatively intuitive, but with greater blindness.　　②Analysis and comparison. On the basis of analyzing the properties of stamping deformation, compare the maximum deformation degree during stamping forming with the allowable limit deformation degree of sheet metal stamping forming performance, and use this as a basis to select a plate suitable for the requirements of the stamping process of this kind of part .　　 In addition, there are cold-rolled and hot-rolled plates of the same grade or thickness. Among domestic plates in my country, thick plates (t>4mm) are hot-rolled plates, and thin plates (t<4mm) are cold-rolled plates (hot-rolled plates are also available). Compared with the hot-rolled sheet, the cold-rolled sheet has accurate dimensions, small deviation, less surface defects, bright, dense internal structure, and better stamping performance. (Note: t generally represents the thickness in the mold. For example, the thickness of the template and the thickness of the material can be represented by t.) 　　 (3) According to the economic requirements, the material selected should be on the premise that the performance and the stamping process requirements are met. In order to reduce the cost of stamping parts, the price is as low as possible, the source is convenient, and the economy is good.