快速充型对镁合金压铸件质量的影响  

Influence of the velocity and start position of high-speed injection stage on the quality of magnesium alloy die casting

作　　者：熊守美[1] 袁建路[2] 刘艳改[3] 刘文辉[1] 柳百成[1] 

机构地区：[1]清华大学机械工程系,北京100084 [2]河北工业职业技术学院材料系,河北石家庄050091 [3]中国地质大学材料科学与工程学院,北京100083

出　　处：《材料科学与工艺》2006年第3期225-228,共4页Materials Science and Technology

基　　金："清华-东洋镁铝合金成形技术研究开发中心"资助项目(0202J02);国家自然科学基金资助项目(50275081)

摘　　要：针对汽车发动机缸盖罩盖零件,采用压力传感器,通过对铸件的表观质量进行评定及铸件密度和抗拉强度的测定,系统研究了镁合金压铸过程中快速充型速度和起速位置对型腔内压力变化和铸件质量的影响.结果表明:随着充型速度增加,镁合金铸件的表观质量显著改善,达到一定值后,这种趋势变化不明显;铸件的表面缺陷随着起速位置的增大先增多后减少;铸件的强度与密度均随着充型速度和起速位置的增大先增大后减小,这与充型速度与起速位置对铸件型腔内压力的影响规律一致;当充型速度为70 m/s,起速位置为210 mm时,镁合金压铸件的质量与性能最佳.A magnesium cylinder head cover die casting was produced to study systemically the influence of the velocity and start position of high-speed injection stage on the pressures in the mold and the quality of magnesium alloy die casting using pressure sensor. The surface quality, relative density and tensile strength of the component were investigated. The results show that the surface quality of magnesium alloy die casting improved greatly with the increase of the velocity of high-speed injection stage in a certain range. With the increase of start position of high-speed injection stage, the surface defects first increased and then decreased. The same law is for the tensile strength and the density of the casting with the increase of the velocity and start position of high-speed injection stage. This corresponds with the influence of the velocity and start position of high-speed injection stage on the pressures in the mold of the castings. Magnesium alloy die casting prepared in the experiment has the best quality and property when the velocity and start position of high-speed injection stage are 70 m/s and 210 mm respectively.

关 键 词：快速充型速度 起速位置 镁合金压铸 外观质量 性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程] TG136[金属学及工艺—金属材料]