锌锭模应力数值模拟及裂纹位置分析.pdfVIP

学兔兔 铸 造 Aug．2010 · 8I4· FOUNDRY VoI．59 NO．8 锌锭模应力数值模拟及裂纹位置分析 杨远平 ，严宏志 (1．湘西民族职业技术学院，湖南吉首416000；2．中南大学机电工程学院，湖南长沙410083) 摘要：针对锌锭模在浇注冷却过程中因裂纹而失效的问题，利用有限元方法，分析了锌锭模的温度场、应力场及其变 化。结果表明模具的热应力为复杂的三向应力，各部分的热应力并不相同，模具上和锌液接触的内表面温度较高，其热 应力为压应力，与水接触表面温度较低，其热应力为拉应力。模具上产生裂纹的部位其热应力远小于材料的抗拉强度， 说明模具是因疲劳而产生裂纹；通过对比发现，裂纹并不一定在最大应力部位，一般是在应力较大同时模具自身组织性 能较差的位置。因此对锌锭模进行应力分析，可以有效预测裂纹可能产生的位置，为模具设计和制造提供理论参考。 关键词：锌锭模；温度场；应力场；数值模拟；裂纹位置 中图分类号：TG261．39 文献标识码：A 文章编号：1001—4977(2010)08—0814—04 Stress Numerical Simulation and Crack Position Analysis for Zinc Ingot Die YANG Yuan-ping’，YAN Hong-zhi (1．Xiangxi National Vocational Technical College，Jishou 416000，Hunan，China；2．School of Mechanical and Electrical Engineering，Central South University，Changsha 41 0083，Hunan。China) Abstract：The crack occurred during the cooling process always causes the breakage of zinc ingot die。To solve this problem，FEM method was employed to analyze the temperature field and stress field of the die as welI as their change rules．The results show that the thermaI stress of die iS complex three—dimensionaI stress．and the stress iS different at various positions．The temperature of inner surface contacts with molten zinc iS higher and its stress iS compression stress：the temperature of the surface contacts with water jS Jower and jts stress jS tensile stress．The thermal stress of crack position in die iS much smaller than the tensile strength of zinc ingot；it explains that the crack of die iS caused by fatigue．By contrast．it iS found tha