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Analysis of Three Principles of Mold Material Selection

update:28-02-2020
abstract:

the mold meets the requirements of working conditions 1 […]

the mold meets the requirements of working conditions
1.Abrasion resistance
When the blank is plastically deformed in the mold cavity, it flows and slides along the cavity surface, which causes severe friction between the cavity surface 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 the main factor affecting wear resistance. In general, the higher the hardness of the mold parts, the smaller the amount of wear and the better the wear resistance. In addition, abrasion resistance is also related to the type, quantity, form, size and distribution of carbides in the material.

2.Toughness
Most of the working conditions of the mold are very harsh, and some often bear large impact loads, which leads to brittle fracture. In order to prevent the mold parts from being suddenly brittle during work, the mold must have high strength and toughness.The toughness of the mold mainly depends on the carbon content, grain size and microstructure of the material.

3.Fatigue fracture performance.
During the work of the mold, under the long-term effect of cyclic stress, it often causes fatigue fracture. Its forms are small energy multiple impact fatigue fracture, tensile fatigue fracture contact fatigue fracture and bending fatigue fracture.The fatigue fracture performance of a mold mainly depends on its strength, toughness, hardness, and the content of inclusions in the material.

4.High temperature performance
When the working temperature of the mold is higher, the hardness and strength will be reduced, leading to early wear of the mold or plastic deformation and failure. Because the mold material should have high resistance to tempering to ensure that the mold has a higher hardness and strength at the working temperature.