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。
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 well as their change rules.The results show that the thermal stress of die is complex three-dimensional 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 is lower and its stress is 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 that the crack is not surely at the position of maximum stress,it is generally at the position where stress is comparatively large but the structure-property is poor.Crack position can be predicted by stress analysis of zinc ingot die,which can offer theoretical references for die design and making.
出处
《铸造》
CAS
CSCD
北大核心
2010年第8期814-817,共4页
Foundry
关键词
锌锭模
温度场
应力场
数值模拟
裂纹位置
zinc ingot die
temperature field
stress field
numerical simulation
crack position
