铝合金汽车方向机壳体压铸工艺优化

Die Casting Process Optimization of Aluminium Alloy Automobile Steering Machine Shell

针对铝合金汽车方向机壳体压铸生产中缺陷较多、产品合格率较低的问题,采用Any Casting数值模拟软件对其压铸过程和缩孔缩松缺陷进行模拟预测。根据模拟结果,对原工艺进行优化,通过正交试验确定最佳的工艺参数。结果表明：将横浇道个数从4个减少为2个,将内浇口厚度由2 mm增加到3 mm,有效改善了金属液汇合、冲击引发的絮流现象;通过设置排气槽可以明显改善卷气现象。方向机壳体压铸最佳工艺参数为浇注温度610℃,压射速度1.2 m/s,模具预热温度170℃,得到的铸件质量显著提高。

In view of lots of defects and low product qualified rate in the actual die casting production of aluminum alloy automobile steering machine shell, the die casting process and shrinkage, porosity were simulated and predicted by using Any Casting numerical simulation software. According to the simulation results, the original process was optimized, and the optimal process parameters were determined by orthogonal experiment. The results show that reducing the runner number from four to two and increasing the gate thickness from 2 mm to 3 mm effectively improve the eddy current phenomenon caused by metal liquid confluence and impact. The air entrapment can be obviously improved by setting exhaust groove. The optimum die casting process parameters of steering machine shell are pouring temperature of 610℃, injection speed of 1.2 m/s, mould preheating temperature of 170℃, and the casting quality is significantly improved.