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The selection of injection mold steel shall meet the requirements of working conditions
Sep 30, 2017

1. Wear resistance
Blank plastic deformation in the mold cavity, the cavity surface flow and sliding, the cavity surface with a dramatic friction between billet, resulting in mould failure due to wear and tear, so, the wear resistance of materials is one of the most basic, the most important performance of mould.
Hardness is the main factor affecting wear resistance. Generally, the higher the hardness of the die parts, the smaller the wear, and the better wear resistance. In addition, wear resistance is also related to the type, quantity, shape, size and distribution of carbide in the material.
2. Strong toughness
The working conditions of the die are very poor, some of them often bear a large impact load, which leads to brittle fracture. In order to prevent the sudden break of mold parts at work, the mold should have high strength and toughness. The toughness of the mould depends on the carbon content, grain size and the state of the material.
3. Fatigue fracture performance
In the process of mould working, the fatigue fracture is often caused by the long-term effect of cyclic stress. Its form has small energy multiple impact fatigue fracture, tensile fatigue fracture, contact fatigue fracture and bending fatigue fracture. The fatigue fracture performance of molds depends on its strength, toughness, hardness and inclusions in the material.
4. High temperature performance
When the working temperature of the mold is high, the intakes will decrease the hardness and strength, resulting in the early wear of the mold or the failure of plastic deformation. The mould material should have high anti-tempering stability to ensure that the mould has a high hardness and strength under working temperature.
5. Thermal fatigue resistance
Some mold in the process of work is in a state of repeated heating and cooling, the cavity surface tension, pressure and stress effect, cause surface cracking and spalling, increase the friction, obstacles to plastic deformation, reduces the dimension precision, resulting in the mould failure. Cold and heat fatigue is one of the main forms of thermal die failure. This type of mould should have high resistance to cold and heat fatigue.
6. Corrosion resistance
Some mould such as plastic die on the job, as a result of the elements such as chlorine, fluorine plastics, strong precipitation erosion gas after heat decomposition, erosion surface of mould cavity, increasing its surface roughness, aggravate the wear failure.

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