【作者】 黄宗辉；

【导师】 田中旭； 黎武新；

【作者基本信息】 上海交通大学 ， 机械工程， 2009， 硕士

【摘要】 铸件充型凝固过程数值模拟是提高铸件质量和铸造生产经济效益的重要途径之一。本文对M3500蠕铁气缸盖铸造工艺现状及缺陷原因进行了分析;并以模拟仿真软件Anycasting为工具,实现了对M3500蠕铁气缸盖铸件充型过程三维数值模拟,同时模拟了铸件凝固过程的温度场,并通过铸件的实际缺陷验证了分析过程和结果的合理性;基于温度场分析结果,依据温度曲线法,温度梯度法和Niyama判据对铸件的缩孔进行了预测;以仿真为手段,研究了M3500气缸盖工艺改进方案,给出了两种工艺改进方法,分别降低了废品率,实现了同时或定向冷却,并通过试验验证了两种方案的有效性。本文通过数值模拟和实践相结合的方式,研究了M3500蠕铁气缸盖铸造工艺,改进了该气缸盖铸造工艺,减少了废品率,可为其它铸件工艺的优化和改进研究提供参考。更多还原

【Abstract】 The numerical simulation of mould filling process and casting solidification process is an important method, by which the casting quality and the production economic benefits can be improved. In this thesis, the analysis for the casting status and some defect reason for the vermicular iron cylinder head of YC M3500 was done. The 3D simulation of the filling and solidification process of the casting of the cylinder head, including the temperature field simulation was done by a software tool ,named Anycasting. The validation for the simulation results was done by comparing with the actual casting flaw. From the result of the temperature field, the casting defects have been calculated by the methods of temperature curve, temperature gradient and Niyama. The research for the optimization of the cylinder head casting was done. Two variants of the optimized casting for lowering the casting defect and the real time or directional cooling were given. The test result shows the availability of the variants.In this thesis, through a combination of numerical simulation and practice, the research for the simulation of the casting process of M3500 vermicular iron cylinder head was done. The optimization improved the casting and lowered the defective index. It can be a reference for other casting process optimization.更多还原