镁合金压铸真空抽气系统的设计与应用研究  

Design and Application of Vacuum Pumping System for Magnesium Alloy Die Casting

作　　者：陈思涛[1] 宋东福 戚文军 周峰 CHEN Si-tao;SONG Dong-fu;QI Wen-jun;ZHOU Feng(Intelligent Manufacturing College,Foshan Polytechnic,Foshan 528137,Guangdong,China;Institute of New Materials,Guangdong Academy of Sciences,Guangzhou 510650,Guangdong,China)

机构地区：[1]佛山职业技术学院智能制造学院,广东佛山528137 [2]广东省科学院新材料研究所,广东广州510650

出　　处：《铸造》2023年第4期458-461,共4页Foundry

基　　金：广东高校青年创新人才项目(2020KQNCX210);广东省科技创新战略专项资金项目(pdjh2020b1220)。

摘　　要：设计了一种含有主、副排气通道的真空抽气系统,主排气通道较副排气通道横截面大,由真空阀控制其开闭,副排气通道采用横截面较小的齿状排气通道,在真空压铸过程中保持全程抽气。研究表明:采用主、副排气通道的真空抽气系统,能够获得外观完整、组织致密的镁合金真空压铸件,气孔率比齿状排气通道压铸件减少48%,T6热处理后气泡减少60%,铸件的抗拉强度、屈服强度和伸长率分别提高9.3%、10.2%和21.4%。A vacuum pumping system with main and auxiliary exhaust channels was designed.The main exhaust channel had a larger cross section than the auxiliary exhaust channel,and its opening and closing was controlled by a vacuum valve.The auxiliary exhaust channel adopted a toothed exhaust channel with a smaller cross section,which kept the whole pumping process during vacuum die casting.The results showed that magnesium alloy vacuum die castings with complete appearance and compact structure were obtained by using the vacuum pumping system with main and auxiliary exhaust channels.The porosity of the castings with the dentate exhaust channel was reduced by 48%,the bubbles were reduced by 60%after T6 heat treatment,and the tensile strength,yield strength and elongation of the castings increased by 9.3%,10.2%and 21.4%respectively.

关 键 词：镁合金 抽气系统 真空压铸 热处理 

分 类 号：TG249.2[金属学及工艺—铸造]