1. Wear resistance
When the billet undergoes plastic deformation in the mold cavity, it flows and slides along the surface of the cavity, causing severe friction between the cavity surface and the billet, resulting in the failure of the dual color mold due to wear. So the wear resistance of the dual color mold 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 dual color mold parts, the smaller the wear amount, and the better the wear resistance. In addition, wear resistance is also related to the type, quantity, morphology, size, and distribution of carbides in the material.
2. Strong resilience
The working conditions of dual color molds are mostly very harsh, some of which often bear large impact loads, leading to brittle fracture. To prevent sudden brittle fracture of dual color mold parts during operation, dual color molds should have high strength and toughness. The toughness of a dual color mold mainly depends on the carbon content, grain size, and microstructure of the material.
3. Fatigue fracture performance
During the working process of dual color molds, fatigue fracture often occurs under the long-term effect of cyclic stress. Its forms include small energy multiple impact fatigue fracture, tensile fatigue fracture, contact fatigue fracture, and bending fatigue fracture. The fatigue fracture performance of dual color molds mainly depends on their strength, toughness, hardness, and the content of inclusions in the material.
4. High temperature performance
When the working temperature of the dual color mold is high, it will cause a decrease in hardness and strength, leading to early wear or plastic deformation of the mold and failure. Therefore, the dual color mold material should have high tempering stability to ensure that the dual color mold has high hardness and strength at working temperature.
5. Cold and hot fatigue resistance
Some dual color molds are in a state of repeated heating and cooling during the working process, causing the surface of the mold cavity to be subjected to tensile and compressive stress, causing surface cracking and peeling, increasing friction, hindering plastic deformation, reducing dimensional accuracy, and ultimately leading to the failure of the dual color mold. Cold and hot fatigue is one of the main forms of failure in hot working molds, and such molds should have high resistance to cold and hot fatigue.
6. Corrosion resistance
Some dual color molds, such as plastic molds, decompose and release strong corrosive gases such as HCI and HF due to the presence of elements such as chlorine and fluorine in the plastic during operation, which corrodes the surface of the dual color mold cavity, increases its surface roughness, and intensifies wear and failure. Therefore, in the processing of dual color molds, it is necessary to choose materials with superior corrosion resistance.
