摘要
对圆孔试样进行分区分析,研究了激光功率、扫描线角度以及轮廓扫描次数对悬垂圆孔结构成形质量的影响。结果表明,激光功率对圆孔成形质量的影响显著,随着激光功率的增大,圆孔圆度值增大,尺寸精度降低,同时悬垂面出现细而长的熔池,部分熔池断裂球化成球状熔滴;当扫描线方向平行于悬垂面边缘线时,悬垂面质量较好,但在成形圆孔顶部近水平悬垂面处出现严重塌陷;在设置的扫描次数范围内,增加轮廓扫描次数可降低悬垂曲面表面粗糙度,优化表面质量。
By means of selective analysis for round hole specimen,the influences of laser power,scanning line angle and number of contour scans on the forming quality of overhanging round holes are investigated.The results show that,the laser power has a significant effect on the forming quality of round holes.With the increase of laser power,the roundness of round holes increases and the dimensional accuracy decreases.At the same time,there are many thin and long melt pools on the overhanging surface,and part of them are fractured into spherical droplets;the overhanging surface quality is better when the scanning line direction is parallel to the edge lines of the overhanging surface,but there occurs a serious collapse on the top of round holes and near to the horizontal overhanging surface.Within the setting number of scans,the increase of the number of contour scans can reduce the surface roughness of the overhanging surfaces and optimize the surface quality.
作者
段声勤
刘婷婷
廖文和
张长东
杨涛
Duan Shengqin;Liu Tingting;Liao Wenhe;Zhang Changdong;Yang Tao(College of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu 210094, China;National Joint Engineering Laboratory for Numerical Control Forming Technology and Equipment, Nanjing, Jiangsu 210094, China)
出处
《中国激光》
EI
CAS
CSCD
北大核心
2018年第4期184-192,共9页
Chinese Journal of Lasers
基金
国家重点研发计划项目(2017YFB1103000)
关键词
激光技术
激光选区熔化
悬垂圆孔
激光功率
轮廓扫描
表面质量
laser technique
selective laser melting
overhanging round hole
laser power
contour scan
surface quality