镁合金真空低压消失模铸造流动性的研究  

Fluidity of Magnesium Alloy in Vacuum Low Pressure Lost Foam Casting

作　　者：吴和保[1] 樊自田[2] 黄乃瑜[2] 贺德秋[3] 

机构地区：[1]武汉工程大学机械工程学院 [2]华中科技大学材料科学与工程学院 [3]湖北省机电研究设计院

出　　处：《特种铸造及有色合金》2007年第3期177-179,共3页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(50275058)

摘　　要：真空低压消失模铸造是一项新材料与新工艺相结合的新技术,具有充型平稳、尺寸精确、压力下凝固等技术优势.着重研究镁合金真空低压消失模铸造的流动性及其与主要工艺参数的关系,探讨了真空低压消失模铸造镁合金的流动性,分析了浇注温度、涂层厚度和充气流量对镁合金流动性的影响,并进行工艺优化.研究结果表明,镁合金真空低压消失模铸造的流动性显著提高,且随着充气流量的升高和涂层厚度的降低而提高,其最佳工艺参数为：充气流量3～5 m^3/h,浇注温度750～780 ℃,涂层厚度0.3～0.5 mm,泡沫材料密度为0.16 mg/cm^3,真空度应控制在0.03 MPa以下.The vacuum low-pressure EPC(expandable pattern casting)is a newly developed casting technique,which combines the advantages of EPC with low pressure casting process,exhibiting the features of stable filling,high accuracy and solidification under pressure.The fluidity of magnesium alloy in vacuum low-pressure EPC and the effects of pouring temperature,coating thickness and gas flux on the fluidity have been investigated,and the optimized processing parameters have been provided.The results show that the fluidity of magnesium can be greatly improved in vacuum low-pressure EPC,moreover,it is increased with increasing gas flux and decreasing coating thickness.The optimized parameters is as follows:gas flux of 3~5 m3/h,pouring temperature at 750~780 ℃,coating thickness of 0.3~0.5 mm,pattern materials density of 0.16 mg/cm3,vacuum rate less than 0.03 MPa.

关 键 词：流动性 工艺优化 镁合金 低压铸造 消失模铸造 

分 类 号：TG249.2[金属学及工艺—铸造]