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    Stavax ESR钢塑料模具抛光面缺陷原因分析

    Cause Analysis on Defects on Polishing Surface of Stavax ESR Steel Plastic Mold

    • 摘要: Stavax ESR钢塑料模具在加工过程中,抛光面出现密集分布的麻点和水波纹缺陷。采用化学成分分析、硬度测试、非金属夹杂物检测、金相检验等方法,分析了麻点和水波纹缺陷产生的原因。结果表明:在热处理过程中温度过高造成晶粒粗大,过热组织带来高的淬火应力;同时粗大的板条状马氏体条束导致模具表面产生楔形裂纹,表面组织应力重新分布和弹性变形,表面楔形裂纹形成折叠裂纹,最终使得模具表面产生麻点和水波纹缺陷。

       

      Abstract: The dense pitting and water ripple defects in the polishing surface of Stavax ESR steel plastic mold were presented during the processing. The defect reasons of the dense pitting and water ripple were analyzed by methods of chemical composition analysis, hardness test, non-metallic inclusions testing and metallographic inspection. The results show that too high temperature led to coarse grain in the process of heating treatment, and the superheated tissue brought high quenching stress. At the same time, the large strip of lath-shaped martensitic beam led to the wedge crack on the surface of the mold. Wedge crack on the surface formed folding crack due to the redistribution of stress on the surface and the elastic deformation. Finally, the mold surface produced the defects of dense pitting and water ripple.

       

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