A) working conditions to meet the requirements of the mold
1, abrasion resistance
Blank in the mold cavity in the plastic degeneration, both the flow and along the cavity surface of the slide, so that the cavity surface and generates intense friction between the blank, leading to mold due to wear and failure. Therefore, wear resistance is the most basic mold, one of the most important performance.
Hardness of the main factors affecting the wear resistance. In general, the higher the hardness of the mold parts, the smaller the amount of wear, wear resistance is also better. In addition, the wear resistance of carbide materials with the type, quantity, shape, size and distribution of the.
2, strength and toughness
Most of the mold is very bad working conditions, often bear some of the larger impact load, leading to brittle fracture. To prevent mold parts sudden brittle fracture at work, die to have high strength and toughness.
Toughness of the mold depends on the carbon content of the material, grain size and organization of the state.
3, fatigue fracture properties
To mold the work process, in the long-term effect of cyclic stress, often leading to fatigue fracture. The form of a small number of energy impact fatigue fracture, fatigue fracture of contacts stretching and bending fatigue fracture fatigue fracture.
Fatigue fracture properties of the mold depends on their strength, toughness, hardness, and material content of inclusions.
4, high temperature performance
When the mold into the higher operating temperature, hardness and strength will decrease, leading to early wear or mold the plastic deformation and failure. Due to mold material should have high resistance to tempering stability, to ensure that the mold in the temperature, the higher the hardness and strength.
5, anti-fatigue properties of hot and cold
Some die in the course of repeated heating and cooling in the state of the cavity surface tension, the pressure change the role of stress, causing surface cracking and spalling, increased friction and hinder plastic deformation, reducing the dimensional accuracy, resulting in die failure. Hot and cold is hot die fatigue failure of the main forms of help such mold should have a high resistance to thermal fatigue.
6, corrosion resistance
Some molds, such as plastic mold at work, because there are plastic chlorine, fluorine and other elements, heat decomposition of precipitation hci, hf and other strong corrosive gases, eroding the surface of the mold cavity, increasing its surface roughness, increased wear failure.From Website
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