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高温高压下塑料颗粒对模具表面的冲蚀,引起模具表面粗糙度发生变化,是造成塑料模具失效的重要原因。针对这个原因,分析了塑料模具表面粗糙度的变化机理;总结了影响塑料模具表面粗糙度变化的因素,主要包括冲蚀速率、冲蚀角度和塑料颗粒的形状与硬度;指出可以通过粒子注入技术、激光熔覆技术、碳氮共渗等技术来降低塑料模具表面粗糙度。
Under the condition of high temperature and high pressure, the erosion of the mold surface by the plastic particles causes the surface roughness of the mold to change, which is an important reason for the failure of the plastic mold. For this reason, the mechanism of the change of the surface roughness of the plastic mold is analyzed. The factors affecting the change of the surface roughness of the plastic mold are summarized, including the erosion rate, the erosion angle and the shape and hardness of the plastic particles. , Laser cladding technology, carbonitriding technology to reduce the plastic mold surface roughness.