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压铸模如出现早期开裂,可能原因是压铸模合金成分偏析、淬火压力不够、冷速慢、截面改变处过渡角小等。可采用固溶淬火+高温回火,分级和等温淬火,回火后快冷等方法,提高韧度,延长使用寿命;加热时严重过热致马氏体针和晶粒粗大,使滑块断口呈现准解理脆性断裂,应严格控制滑块热处理工艺操作;采用蒸气处理、离子渗氮、PVD、CVD表面镀膜、渗硼处理、喷涂润滑剂等措施可避免压铸模焊合及熔损失效破坏。
Die-casting mold, such as the emergence of early cracking, may be due to die-casting alloy composition segregation, quenching pressure is not enough, slow cooling, cross-section change at a small transition angle. Can be used solution tempering + high temperature tempering, grading and isothermal quenching, rapid cooling after tempering and other methods to improve the toughness and extend the service life; severe overheating heating martensite needle and coarse grains, so that the slider fracture appears Quasi-cleavage brittle fracture, the slider should be strictly controlled heat treatment process operation; using steam treatment, ion nitriding, PVD, CVD surface coating, boronizing treatment, spray lubricant and other measures to avoid die-casting die welding and failure damage failure.