In the production of silicone products mold, the first thing to consider is the choice of mold materials. According to the product quality, quantity, structure to determine the mold material, mold material is the mold making process is very important link. Mold material need to meet three requirements: first of all, the mold meet resistance, toughness and work demand; secondly, tooling to meet the process requirements. Thirdly, the mold should be meet the requirements of the economic applicability.
(a) die to meet the requirements of working conditions
1, wear resistance
Billet in mold cavity plastic deformation, along the cavity surface can flow and sliding, intense friction between the cavity surface and blank, thus easily lead to die due to wear and failure. Therefore, the wear resistance of the material is die the most basic, the most important properties of.
Hardness is the major factor affecting the wear resistance. Under normal circumstances, higher hardness of the mold parts, wear volume is small, the better wear resistance. In addition, wear resistance also with kinds of carbide material, number, morphology, size and distribution of.
2, strong toughness
Die working conditions are very bad, some are often subjected to impact load, which leads to brittle fracture. In order to prevent mould parts in work when all of a sudden brittle fracture, the mold to have higher strength and toughness. Mould toughness depends on the materials of carbon content, grain size and microstructure of state.
3, fatigue fracture performance
Long-term effects of the working process of the mould, the cyclic stress often leads to fatigue fracture. The form of a small energy repeated impact fatigue fracture and tensile fatigue fracture contact fatigue fracture and bending fatigue fracture. Mold and fatigue fracture performance depends on the strength, toughness, hardness, and the inclusions in the material content.
4, high temperature performance
When the mold temperature is higher, the hardness and strength decreased, leading to early die wear or plastic deformation and failure. Therefore, the mold material should have higher resistance to tempering stability to ensure the mold under the operating temperature, with higher hardness and strength.
5, thermal and thermal fatigue properties
Some molds in the working process in the repeated heating and cooling of the state, the cavity surface tension, stresses the role, causing cracking and peeling off the surface, increase the friction, hinder plastic deformation, size accuracy is reduced, resulting in failure die. Thermal fatigue is hot as one of the main forms of die failure, help this kind of mold should have higher resistance to thermal fatigue performance.
6, corrosion resistance
Some molds such as plastic mold in the work, due to the presence of chlorine, fluorine and other elements in the plastic, the thermal decomposition of HCI, HF and other strong corrosive gases, erosion of the mold cavity surface, increase the surface roughness, increased wear and tear.
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