Working condition requirements for Plastic Injection Mold

Plastic Injection Mold material selection is a very important link in the whole process of Plastic Injection Mold production. The selection of Plastic Injection Mold needs to meet three principles: Plastic Injection Mold meets the work requirements of wear resistance, strength and toughness, and Plastic Injection Mold meets the process requirements. 

At the same time, Plastic Injection Mold should meet economic applicability.

The working conditions of Plastic Injection Mold are as follows:

1. When the abrasive blank is Plastic denaturated in the cavity of Plastic Injection Mold, it flows and slides along the surface of the cavity, resulting in intense friction between the surface of the cavity and the blank, resulting in the failure of Plastic Injection Mold due to wear. Therefore, the wear resistance of material is one of the basic and important properties of Plastic Injection MoldZ. Hardness is the main factor affecting wear resistance. In general, the higher the hardness of Plastic Injection Mold parts, 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, cold and heat fatigue resistance Some Plastic Injection Mold in the process of work in the state of repeated heating and cooling, the cavity surface tension, pressure variable stress effect, cause surface cracking and spalling, increase friction, hinder plastic deformation, reduce dimensional accuracy, resulting in the failure of injection mold. Cold and heat fatigue is one of the main forms of failure of hot Plastic Injection Mold. This kind of Plastic Injection Mold should have high cold and heat fatigue resistance.

3, corrosion resistance of some Plastic Injection Mold, such as Plastic Mold at work, due to the presence of chlorine, fluorine and other elements in plastic, after heat decomposition HCI, HF and other strong corrosive gas, erosion of Plastic Injection Mold cavity surface, increase the surface roughness, increase the wear failure.

4. The working conditions of strong and ductile Plastic Injection Mold are mostly very bad, and some often bear large impact load, which leads to brittle fracture. In order to prevent the sudden brittle break of Plastic Injection Mold parts when working, Plastic Injection Mold should have high strength and toughness. The toughness of Plastic Injection Mold mainly depends on the carbon content, grain size and microstructure of the material.

5, In the process of working, under the long-term action of cyclic stress, often lead to fatigue fracture. Its forms include low energy multiple impact fatigue fracture, tensile fatigue fracture, contact fatigue fracture and bending fatigue fracture. The fatigue fracture performance of Plastic Injection Mold mainly depends on its strength, toughness, hardness, and the content of inclusions in the material.

6, high temperature performance when the working temperature of Plastic Injection Mold is higher, the hardness and strength will decrease, leading to early wear or Plastic deformation of Plastic Injection Mold and failure. Therefore, Plastic Injection Mold material should have high tempering resistance stability, to ensure that Plastic Injection Mold has high hardness and strength at working temperature.