低压铸造铝合金蜗轮减速机壳体工艺设计及优化

Design and Optimization of Low-pressure Die Casting Process for Aluminum Alloy Worm Reduction Gears

为提高低压铸造蜗轮减速机壳体成形品质并提高生产效率,利用数值模拟方法对其凝固过程中的温度场、缩松缩孔情况进行分析。预测了缩松缩孔缺陷的位置分布及大小,并分析其形成原因。在此基础上,通过改进浇道、调整工艺参数、添加冷却等措施进行优化设计。结果表明,优化后的铸件内无缩松、缩孔缺陷,提高了铸件品质,凝固时间缩短了38.8%。通过金相分析,验证了此优化工艺的可行性。

In order to improve the quality of low-pressure die casting worm reduction gear housing and production efficiency,numerical simulation methods were used to analyze the temperature field and shrinkage porosity during the solidification process.The distribution and size of the shrinkage porosity were predicted,and the reasons for its formation were analyzed.On this basis,through improving the runner,adjusting the technological parameter,and adding cooling channel,the scheme was designed and optimized.The results show that there exists absence of shrinkage porosity in the optimized castings,which improves the quality of the castings and the setting time is reduced by 38.8%.The feasibility of the squeeze casting process was verified by metallographic observation.