1, wear resistance
In the mold cavity of the mold, the flow and sliding along the surface of the cavity surface, the surface of the mold cavity and the blank to produce a severe friction, which leads to the failure of the mold due to wear and tear. So the wear resistance of the material is one of the most basic and important performance.
Hardness is the main factor that affects the wear resistance. Under normal circumstances, the higher the hardness of die parts, the smaller the wear, the better the wear resistance. In addition, the wear resistance of the material in the type, number, shape, size and distribution of the carbide.
2 strong toughness
The working condition of the mould is very bad, and some of it is often subjected to the large impact load, which can lead to brittle fracture. In order to prevent the mold parts in the work suddenly brittle fracture, the mold to have a high strength and toughness.
The toughness of the die depends mainly on the carbon content, the grain size and the microstructure of the material.
3 fatigue fracture properties
In the process of the mold work, under the long-term action of the cyclic stress, often leads to the fatigue fracture. In the form of a small energy impact fatigue fracture, tensile fatigue fracture contact fatigue fracture and bending fatigue fracture.
The fatigue fracture properties of the die mainly depend on the strength, toughness, hardness, and the content of inclusion in the material.
4 high temperature performance
When the working temperature of the mold is higher, it will make the hardness and strength decrease, leading to the early wear or plastic deformation and failure of the die. Therefore, the mold material should have a high resistance to tempering stability, in order to ensure that the mold at the working temperature, with a high degree of hardness and strength.
5 resistance to cold and hot fatigue performance
Some molds in the working process in the repeated heating and cooling of the state, the cavity surface tension and stresses the role of, cause cracking and peeling off the surface, increase the friction, hinder plastic deformation, size accuracy is reduced, resulting in die failure. Thermal fatigue is one of the main forms of the failure of the mold, which should have a high resistance to cold and heat fatigue.
6 corrosion resistance
Some molds such as plastic mold at work, due to the presence of chlorine, fluorine and other elements in the plastic, after heating the decomposition of HCI, HF and other strong corrosive gases, erosion mold cavity surface, increase the surface roughness, increased wear failure.