AM50镁合金压铸件致密性与压铸工艺研究

Study on Die Casting Technology and Casting Soundness of AM50 Magnesium Alloy

压铸件的致密性是评价其质量的重要指标,通常用密度来衡量。以AM50压铸镁合金为研究对象,采用多因素分析法设计了阶梯块试样和压铸工艺参数。通过压铸试验和压铸件的密度测定,分析了压铸工艺参数对铸件密度的影响规律,获得致密度高的压铸件工艺参数为:浇注温度650℃、模具温度180℃、铸造压力44MPa、低速速度0.25m/s、高速速度3m/s、高速位置230mm、增压位置280mm、增压时间20ms、料饼厚度30mm。研究还表明,不同厚度阶梯块理想的压铸工艺参数不同。

Casting soundness is an important quality index of die castings and density is usually used as a measure of it. Based on multi-factors analysis, a step-shape casting of AM50 magnesium alloy and die casting process parameters were designed. Die casting experiments were conducted and the density of the casting was measured. The influence of die casting process parameters on the casting density was analyzed. The results show that the optimal die casting process parameters with high casting soundness are as follows： pouring temperature 650℃, die temperature 180 ℃, casting pressure 44 MPa, slow shot speed 0,25 m/s, fast shot speed 3 m/s, fast shot speed position 230 mm, pressure intensification position 280 mm and time 20 ms and biscuit thickness 30 mm. The results also indicate that step samples with different thickness have different optimal process parameters.