AM50镁合金压铸件致密性与压铸工艺研究.pdfVIP

维普资讯 学兔兔 Ju1．2008 铸 造 VOJ．57 NO．7 FOUNDRY AM50镁合金压铸件致密性与压铸工艺研究 程晓宇 一，熊守关 (1．先进成形制造教育部重点试验室，清华大学机械工程系，北京 100084； 2．陕西国防工业职业技术学院，陕西西安710302) 摘要：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44 MPa、低速速度0，25 m／s、 高速速度3 m／s、高速位置230 mm、增压位置280 mm、增压时间20 ms、料饼厚度30 mm。研究还表明，不同厚度阶梯块 理想的压铸工艺参数不同。 关键词：镁合金压铸；AM50合金；致密性；密度 中图分类号：TG146．2 文献标识码：A 文章编号：1001—4977(2008)07—066l一04 Study on Die Casting Technology and Casting Soundness of AM50 Magnesium Alloy CHENG Xiao-yu’一，XlONG Shou-mei’ (1．Key Laboratory for Advanced Materials Processing Technology，Ministry of Education， Depadment of Mechanical Engineering，Tsinghua University，Beijing 1 00084，China；2．Technology and Industry for National Defense Shaanxi，Xi‘an 71 0302，Shaanxi，China) Abstract：Casting soundness iS an impo~ant 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 foIlows：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