变速器主壳体高压铸造工艺中压射高低速切换点优化

Optimization of High and Low Speed Switching Position of Injection in High Pressure Casting Main Housing of the Gearbox

对9AT汽车变速箱主壳体的压铸成形过程进行充型仿真,分析了不同压射高低速切换点对金属液流动和充型的影响。结果表明,当压射低速值为0.2 m/s,高速值为3.5 m/s,高低速切换点为560 mm时,模流平稳,卷气概率最低。采用该工艺参数进行试生产,铸件组织致密,力学性能较好。

Based on 9AT transmission housing, filling simulation was carried out for the die-casting process of the main housing and the influence of high and low speed switching positions on the flow and filling of the metal fluid was analyzed. The results reveal that with the low speed of 0. 2 m/s, the high speed of 3. 5 m/s and the switching position of 560 mm, the filling flow is smooth and the probability of gas-entrapment is the lowest. The optimized process parameters were adopted for the trial production, and products are dense with the satisfied mechanical properties.