选区激光熔化成形AlSi10Mg铝合金零件支撑结构的研究  

Research on support structure for Al Si10Mg aluminum alloy parts by selective laser melting

作　　者：何先定 吴凌 安治国[3] He Xianding;Wu Ling;An Zhiguo(General Aviation Academy,Chengdu Aeronautic Polytechnic,Chengdu 610021,China;Chongqing Huagang Technology Co.,Ltd.,Chongqing 400044,China;School of Mechanotronics and Vehicle Engineering,Chongqing Jiaotong University,Chongqing 400074,China)

机构地区：[1]成都航空职业技术学院通用航空学院,四川成都610021 [2]重庆市华港科技有限公司,重庆400044 [3]重庆交通大学机电与车辆工程学院,重庆400074

出　　处：《锻压技术》2020年第9期113-117,136,共6页Forging & Stamping Technology

基　　金：四川省教育厅自然科学基金资助项目(18ZA0033)。

摘　　要：为研究不同摆放方式和支撑结构对选区激光熔化(SLM)成形铝合金制件尺寸精度的影响,对某无人机停车扳机零件进行了研究。通过对成形制件的成形工艺分析,提出了3种适合SLM工艺的摆放方式,设计了两类支撑结构,并对摆放方式及支撑结构的6种组合进行了工艺试验。对试验所得的不同制件从支撑体积、单独打印时间、零件支撑表面积及表面积占比4个方面进行了比较。同时,对去除支撑后的制件进行了三维激光扫描和误差分析。结果表明:采用立式正装a方式,支撑体积最小,设计支撑面也最小,表面效果及成形精度最好。当激光功率为400 W、扫描速度为1100 mm·s^-1、铺粉厚度为50μm、扫描间距为110μm时,可以将制件的正负偏差控制在0.3 mm以内。In order to investigate the influences of different placement types and support structures on the dimensional accuracy of aluminum alloy parts formed by selective laser melting(SLM),the parking trigger part of an unmanned aerial vehicle was studied,and through the analysis of forming process,three kinds of placement types suitable for SLM process were purposed.Then,two kinds of support structures were designed,and the process tests were carried out on six combinations of placement types and supporting structures.Furthermore,the different parts obtained from test were compared in four aspects of support volume,separate printing time,support surface area and proportion of surface area for parts,and the parts after removing the supports were conducted by 3D laser scanning and error analysis.The results show that for a type of vertical installation,the support volume and the designed supporting surface are the smallest,and the surface effect and the forming accuracy are the best.When the laser power is 400 W,the scanning speed is 1100 mm·s^-1,the powder-bed depth is 50μm,and the scanning spacing is 110μm,the positive and negative deviations of parts are controlled within 0.3 mm.

关 键 词：选区激光熔化 多孔铝合金 摆放方式 支撑结构 尺寸精度 

分 类 号：TG456.7[金属学及工艺—焊接]