ZM5合金齿轮壳体铸造工艺研究

Research on Casting Process of ZM5 Alloy Gear Shell

以ZM5合金齿轮壳体为研究对象,通过对其结构分析以及ProCAST数值模拟,对其铸造工艺进行了研究。结果表明,对于壁厚为15~25mm,轮廓尺寸为160mm×100mm×80mm的齿轮箱壳体,采用700℃浇注,浇注时间为6s,设置2个缝隙内浇道的浇注方案能够成形良好,但是在厚凸台内部会产生缩松缺陷,实际浇注结果和模拟结果符合良好。根据ProCAST模拟结果和浇注试样的情况,对铸造工艺进行优化,改用陶瓷过滤网、增加局部冷铁、提高浇注温度后,效果良好,其化学成分、力学性能、尺寸精度、内部质量均能满足设计指标。

The effects of processing parameters on the ZM5 gear shell were investigated by product structural analysis and ProCAST simulation.The results reveal that the gear shell with the thickness of 15~25 mm and overall dimensions of 160 mm×100 mm×80 mm,can be well produced with pouring at 700℃for 6 sand setting two slit gate.However,porosity can be found in the concave position at thick wall of castings.According to the simulation results of proCAST and the actual production,the defects were obviously reduced by optimizing the casting process,such as adopting ceramic fiter,adding partial chill and increasing the pouring temperature.The chemical composition,mechanical properties,dimensional accuracy can all meet the product standard.