中文摘要：

以A356铝合金变速箱铸件为例,采用三维绘图软件Solidworks对变速箱进行3D造型,运用ProCAST软件对其预定工艺的低压铸造充型和凝固过程进行了仿真。根据铸件充型的仿真结果,发现在充型过程中金属液面前沿出现参差不齐的现象。经验证分析这种现象主要是由于浇注系统设计不合理造成的。改变浇口位置后,金属液充型平稳。在铸件凝固后发现,在预定工艺中,变速箱上边缘以及浇口处产生了缩松缩孔的铸造缺陷,这是浇注温度过高引起的。根据仿真结果,进行了工艺优化,将浇注温度降低到700℃,再次进行铸造过程的仿真,发现缺陷得到了有效控制,铸件的质量获得明显改善。

英文摘要：

Taking A356 aluminum alloy gearbox casting as an example, 3D modeling of the gearbox was done by using three-dimensional reaping software Solidworks. The filling and solidification process of low pressure casting was simulated by using ProCAST software. According to the numerical simulation results of casting filling, it is discovered that the jagged surface frontier of metal liquid appears. Through the verification analysis, it is discovered that the phenomenon is caused mainly by the irrational gating system design. After changing the gate location, the mold filling of the liquid metal is steady. After the casting solidification, it is discovered that the upper edge of gearbox and the gate place produce casting defects of porosity and shrinkage. This is caused by the too high pouring temperature. According to the simulation results, the process was optimized. Reducing the pouring temperature to 700℃, the casting process was simulated again.It is found that defects are effectively controlled, and quality of the casting is obviously improved.