挤压铸造代替压铸制造铝合金壳体的工艺改进

Production of Aluminum Alloy Housing by Squeezing Casting

针对压铸铝合金壳体件存在气孔等铸造缺陷,分析了其产生的原因,并用间接挤压铸造工艺取代压铸工艺。采用的间接挤压铸造工艺参数:充型速度为0.03～0.05m/s,充型时间为0.2s,模具温度为250～300℃,浇注温度为720～740℃,加压压力为150MPa。工艺改进后,成功地制造出了耐1.5MPa气密性要求的产品,其力学性能高于压铸产品,且内部无铸造缺陷。

Aiming at the gas hole in aluminum alloy housing in die casting , the housing parts were produced by indirect squeezing casting substituting for die casting based on the analysis of formation reason. The optimized processing parameters for the indirect squeezing casting are as follows: filling velocity of 0.03~0.05 m/s, filling time of 0.2 s, mould temperature at 250~300 ℃, pouring temperature at 720~740 ℃ and pressure-applying for 150 MPa. The housing parts without defects were produced successfully by squeezing casting, which meets the gas-sealing requirement at 1.5 MPa and is superior to die casing housing parts in mechanical properties.