摘要
基于选择性激光熔化技术,研究了不同扫描路径对Ti6Al4V成形试样的表面粗糙度、残余应力、翘曲变形的影响。结果表明:无论是长边扫描还是短边扫描,上表面的粗糙度值要明显小于侧表面的粗糙度值,和扫描方向相平行的侧表面的粗糙度值要小于和扫描方向相垂直的侧表面的粗糙度值。采取短边扫描的成形件和基板之间的残余应力值更小,且成形件和基板的最大翘曲变形相较于长边扫描减小了约35%。在SLM成形前,采取对基板进行适当预热的方式可以减小成形过程中成形件和基板之间的温度梯度,从而达到减小残余应力的目的。采取短边扫描且基板预热温度为300℃的成形件达到了99.4%的近全致密,采取短边扫描的成形件的致密度要高于采取长边扫描的成形件的致密度。实验结果表明,采取短边扫描的SLM成形件的成形质量更好。
Based on selective laser melting technology,the effects of different scanning paths on the sulfaee roughness,residual stress and warpage of Ti6Al4V formed specimens were studied.The results show that the roughness of the upper surface is obviously less than the roughness of the side surface,and the roughness of the side surface parallel to the scanning direction is less than the roughness of the side surface perpendicular to the scanning direction, whether it is long side scanning or short side scanning.The residual stress between the forming parts and the substrate with short side scanning is less ,.and the maximum warping deformation of the forming parts and the substrate is reduced by about 35% compared with the long side scanning.Before SLM forming,the temperature gradient between the forming parts and the substrate can be reduced by proper preheating of the substrate,thus reducing the residual stress.The forming parts with short side scanning and the preheating temperature of 300 centigrade are nearly 99.4%,and the compact degree of the forming parts with short side scanning is higher than that of the forming parts with long side scanning.The experimental results show that the forming quality of SLM forming parts with short side scanning is better.
作者
刘兴鹏
武美萍
魏建锋
LIU Xingpeng;WE Meiping;WEI Jianfeng(Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology,Jiangnan University,Wuxi Jiangsu 214000,China)
出处
《机械设计与研究》
CSCD
北大核心
2019年第1期133-137,共5页
Machine Design And Research
基金
装备预研教育部联合基金(6141A0221)
