压铸件模具型腔散热过程分析

Analysis of Cooling Process of Die Castings in Mold Cavity

基于热传导理论,对压铸件压铸过程进行了温度分析,构建了有限元模型,在特定的边界条件约束下,对压铸件进行有限元仿真,得到铸件和模具的温度扩散分布图,结果表明:压铸件尖角处局部散热不均匀,且会出现应力集中现象,使得压铸件在取出型腔后变形,甚至出现裂纹等缺陷。通过增加尖角半径、改善冷却系统,使应力集中得以减少或消除。

Based on heat conduction theory, a finite element model was built and the temperature analysis of die castings during casting process was carried under certain boundary constraints. Temperature diffusion profile about castings and molds was obtained. The results show that there is heat local uneven at sharp corners of die castings and stress concentration, which makes deformation, crack and other defects occur when die castings remove from the casting cavity. The stress concentration can be reduced or eliminated by increasing the radius of the comers and improving the cooling system.