摘要
激光选区熔化(SLM)成形中,常产生边缘位置高于内表面即边缘堆高现象,边缘堆高将会对SLM成形过程产生不良影响。理论分析了SLM成形中边缘堆高的产生机制,提出了轮廓-实体和边缘重熔两种控制方法。进一步研究了这两种控制方法下工艺参数,如边缘宽度、边框厚度、扫描速度和激光功率,对堆高高度的影响。结果表明:两种方法均能有效地消除边缘堆高。对于轮廓-实体控制方法,堆高高度随扫描速度的增大而减小,随激光功率的升高而增大,轮廓间距对边缘堆高无影响;对于边缘重熔控制方法,堆高高度随扫描速度的增大而减小,随激光功率的升高而增大,随边框厚度的增大而增大。
In selective laser melt（SLM）molding process,the edge position is usually higher than the inner surface,which is also called elevated edge phenomenon.Elevated edge has bad effects on SLM molding process.We theoretically analyze the production mechanism of elevated edge in SLM molding process,and propose a contourentity control method and an edge remelting control method.Effects of processing parameters on edge height are studied.Processing parameters include contour spacing,border thickness,scanning speed and laser power.Results show that these methods can effectively reduce the elevated edge.For the contour-entity control method,the height of elevated edge decreases with the increas of scanning speed,increases with the increas of laser power,and is not susceptible to contour spacing.For the edge remelting method,edge height decreases with the increas of scanning speed,and increases with the increas laser power and contour thickness.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2017年第12期97-105,共9页
Chinese Journal of Lasers
基金
国家安全重大基础研究(613281)
国家自然科学基金(61575074)
华中科技大学院系自主创新研究基金(2016YXZD005)
