The Mold Meets The Working Conditions
1. When the wear-resistant blank is plastically denatured in the cavity of the mold, it flows and slides along the surface of the cavity, causing severe friction between the surface of the cavity and the blank, which causes the mold to fail due to wear. Therefore, the wear resistance of the material is one of the most basic and important properties of the mold. Hardness is a major factor affecting wear resistance. In general, the higher the hardness of the mold part, the smaller the wear amount, and the better the wear resistance. In addition, the wear resistance is also related to the type, quantity, shape, size and distribution of carbides in the material.
2. The working conditions of the toughness mold are mostly very bad, and some often bear a large impact load, resulting in brittle fracture. In order to prevent the mold parts from suddenly breaking during work, the mold must have high strength and toughness. The toughness of the mold depends mainly on the carbon content, grain size and microstructure of the material.
3. Fatigue fracture performance During the working process of the mold, fatigue fracture is often caused by the long-term effect of cyclic stress. The form has small energy multiple impact fatigue fracture, tensile fatigue fracture contact fatigue fracture and bending fatigue fracture. The fatigue fracture properties of the mold depend mainly on its strength, toughness, hardness, and the amount of inclusions in the material.
4. High-temperature performance When the working temperature of the mold is higher, the hardness and strength will decrease, resulting in early wear or plastic deformation of the mold and failure. Therefore, the mold material should have high anti-tempering stability to ensure that the mold has high hardness and strength at the working temperature.
5. Resistance to cold and heat fatigue Some molds are in a state of repeated heating and cooling during the working process, causing the surface of the cavity to be subjected to tensile and pressure-induced stresses, causing surface cracking and spalling, increasing friction and impeding plastic deformation. Reduced dimensional accuracy, resulting in mold failure. Hot and cold fatigue is one of the main forms of hot work die failure, and it should have high resistance to cold and heat fatigue.
6. Corrosion resistance Some molds such as plastic molds work, due to the presence of chlorine, fluorine and other elements in the plastic, after the heat, the HCI, HF and other strong aggressive gases are resolved, eroding the surface of the mold cavity and increasing its surface roughness. Increase wear and tear.
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