【摘要】 根据熔模精密铸造过程的传热特点 ,通过对铸型 /环境边界及冒口/环境边界进行自然对流和辐射传热处理 ,改进了原有数值模拟系统 ,实现了对熔模铸造凝固过程温度场的数值模拟 .对采用 4种不同铸造工艺方案的阀体铸件凝固过程进行了数值模拟及缺陷预测 ,获得了与试验相一致的模拟结果 .根据数值模拟结果 ,确定了进行批生产的铸造工艺方案 .更多还原

【Abstract】 After studying the specific property of the investment casting , the 3 D numerical simulation of temperature field based on the finite difference method (FDM) for the solidification process of investment casting has been developed by dealing mold/environment boundary and riser/ environment boundary condition with convection and radiation to improve old modeling. The numerical simulation of temperature field and shrinkage defect prediction for a valve casting, which was involved in 4 kinds of casting processes, were carried out. The good agreement has been obtained between the numerical simulation and the experimental result verification. Based on the numerical simulation result, the casting process of the valve for practical mass production has been set up.更多还原