Die selection is a very important part in the whole process of mould making. Die selection needs to meet the three principles, mold to meet the wear resistance, strong toughness and other work needs, mold to meet the requirements of the process, while the mold should meet the economic applicability. Requirements: 1, wear resistance, billet in the mold cavity plastic degeneration, along the surface of the cavity flow and sliding, so that the surface of the cavity and the billet between the sharp friction, resulting in the die due to wear and failure. Therefore, the wear resistance of the material is one of the most basic and important properties of the mold. Hardness is the main factor that affects wear resistance. In general, the higher the hardness of the die parts, the smaller the wear, the better the wear resistance. In addition, the abrasion resistance is related to the type, quantity, shape, size and distribution of carbides in the material. 2. Strong toughness, the working conditions of the die are mostly very bad, some often bear a large impact load, resulting in brittle fracture. In order to prevent the die parts at work suddenly brittle broken, the mold should have a high strength and toughness.
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