1, wear resistance, the blank in the mold cavity plastic degeneration, both along the cavity surface flow and slide, so that the cavity surface generated intense friction between the billet, leading to mold components due to wear. So the wear resistance is the most basic mold, one of the most important performance. Hardness is a major factor affecting wear resistance. In general, the higher the hardness of the die assembly, the smaller the amount of wear, the better the wear resistance. In addition, the wear resistance of the type, quantity, shape, size and distribution of materials related carbide.
2, toughness, mold working conditions are mostly very poor, some often bear a larger impact load, resulting in brittle fracture. To prevent mold components suddenly brittle fracture at work, the mold should have a high strength and toughness. Mold toughness depends mainly on the carbon content of the material, grain size and organization status.
3, fatigue fracture properties, die working process, in the long-term effects of cyclic stress often leads to fatigue fracture. In the form of many small energy impact fatigue fracture, fatigue fracture contact fatigue fracture tensile and bending fatigue fracture. Fatigue fracture properties of the mold depends on its strength, toughness, hardness, and the content of the material inclusions.
4, high temperature performance, when the high mold temperature, hardness and strength will decrease, leading to early wear of the die or plastic deformation and failure. Thus, the mold material should have high resistance to tempering stability, to ensure the mold at the operating temperature, high hardness and strength.
5, resistance to thermal fatigue properties, and some die in the course of their work repeated heating and cooling status, so that the cavity surface tension, the pressure becomes stress, causing surface cracking and spalling, increasing friction, hinder plastic deformation , reduced dimensional accuracy, resulting in failure of the mold. Thermal fatigue is one of the main forms of hot die failure, such mold assembly should have a high resistance to thermal fatigue performance.
6, corrosion resistance, and some molds such as plastic at work, due to the chlorine, fluorine and other elements are present in plastics, precipitation decomposition when heated HCI, HF and other strong corrosive gases, mold cavity surface erosion, increasing its surface roughness degree, increased wear and tear failure.
This article is provided by the ACT MOLD COMPONENTS http://www.actcomps.com