Mold Knowledge Forum: Die of several principles of selection – Die, Die Technology – Hardware Industry
Need to meet the three principles of mold material selection, mold meet the wear resistance, toughness, etc. needs, mold meet the technical requirements, and shall meet the economic suitability of mold.
Hardware Network HC ( A) The working conditions meet the requirements Die
1, wear resistance Plastic blank in the mold cavity degeneration, the flow along the cavity surface, they both slide to the cavity surface and a sharp friction between billet, resulting in mold failure due to wear and tear. So, 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 mold parts, wear smaller, the better wear resistance. In addition, the wear resistance of carbide with material type, quantity, shape, size and distribution of the.
2, strength and toughness Mold most appalling working conditions, often bear some of the larger impact load, leading to brittle fracture. To prevent mold parts at work, suddenly brittle fracture, die to have high strength and toughness.
Mold material depends on the toughness of the carbon content, grain size and organization of the state.
3, fatigue fracture properties Die working process, in the long-term effect of cyclic stress often leads to fatigue fracture. The form of a small number of energy impact fatigue fracture, fatigue fracture of the contact fatigue fracture tensile and bending fatigue fracture.
Die of fatigue fracture properties are dependent on their strength, toughness, hardness, and material content of inclusions.
4, high temperature performance Higher temperature when the mold into the work, the hardness and strength will decrease, leading to early wear or mold plastic deformation and failure. Therefore, the mold material should have high temper resistance, to ensure that mold in the operating temperature, high hardness and strength.
5, resistance to thermal fatigue Some die in the course of their work in the repeated heating and cooling of the state, so that the cavity surface tension, pressure changes the role of stress, causing cracking and spalling of the surface, increasing friction and hinder plastic deformation, reducing the dimensional accuracy , resulting in mold failure. Thermal fatigue is a hot die one of the main forms of failure to help this type of mold should have a high resistance to thermal fatigue.
6, corrosion resistance Some die at work, such as plastic mold, plastic exists as chlorine, fluorine and other elements, heated decomposition precipitation HCI, HF and other strong corrosive gases, mold cavity surface erosion, increase its surface roughness, increased wear failure.
(B) of the mold meet the technical performance requirements
Mold manufacturing generally go through forging, machining, heat treatment, several working procedure. To ensure the quality of mold manufacturing, lower production costs, the material should have good malleability, machinability, hardenability, hardenability and can be grinding sex; should have little oxidation, decarbonization and quenching sensitivity deformation cracking tendency.
1, malleable Has lower deformation resistance of hot forging, plastic good, wide range of forging temperature, forging crack network carbide precipitation of cold cracking and a low propensity.
2, annealing process of Ball annealing temperature range, annealing range of low hardness and small fluctuations, the ball high.
3, Machinability
Cutting large, low tool wear, low surface roughness.
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