论文部分内容阅读
在快速模具制造工艺 RT (Rapid Tooling)中 ,采用尺寸凝固模拟技术保证铸件的尺寸精度是 RT工艺中关键的技术环节 ,而凝固分析中铸件 /铸型边界模型的正确与否对尺寸凝固模拟精度有着重要的作用。采用 3种不同的铸件/铸型边界模型对 RT工艺中典型标准件的凝固过程进行数值分析及实验验证 ,分析结果及实验证明在 RT工艺铸件尺寸精度的凝固分析中 ,铸型 /铸件的边界模型采用铸件、铸型均为热变形弹塑性体 ,且采用接触力学中的接触单元法对铸型 /铸件的边界进行分析更符合实际。采用这种铸件 /铸型边界模型对汽车覆盖件模具的凝固过程进行了热力耦合分析 ,数值计算得到的铸件尺寸与实际铸件的尺寸吻合较好 ,证实所采用的铸型 /铸件边界模型是正确的、可行的
In Rapid Tooling (RT), the dimensional solidification simulation technique is used to ensure the dimensional accuracy of the castings, which is the key technology in the RT process. The correctness of the casting / mold boundary model in the solidification analysis is not affected by the size and solidification simulation accuracy Has an important role. Three different casting / mold boundary models were used to analyze and verify the solidification process of typical standard parts in RT process. The analysis results and experimental results show that in the solidification analysis of RT dimensional accuracy of castings, the boundary of mold / casting The model is made of castings and the molds are all heat-deformable elastic-plastic bodies. It is more realistic to use the contact element method in contact mechanics to analyze the mold / casting boundary. The casting / mold boundary model is used to analyze the solidification process of the automobile panel mold. The calculated size of the casting is in good agreement with the actual size of the casting, which confirms that the mold / casting boundary model is correct And feasible