工艺参数对SLM激光快速成型件表面粗糙度的影响

Effects of Parameters on Surface Roughness of Samples by Selective Laser Melting

主要研究SLM激光快速成型过程中各工艺参数对成型件表面粗糙度的影响。影响成型件表面粗糙度的工艺参数主要有激光功率、扫描速度、搭接率、切片层厚和倾斜角度。采用正交实验方法,研究激光功率、扫描速度、搭接率三个工艺参数对快速成型件水平面表面粗糙度的影响规律、倾斜角度对斜面表面粗糙度的影响以及切片层厚对零件的垂直面的表面粗糙度影响。实验结果表明:搭接率是影响水平面表面粗糙度的最主要的因素,当其它参数相同,搭接率为30%时,表面粗糙度值最小;倾斜角度越大,表面粗糙度值越小;切片层厚越小,表面粗糙度值越小。

It was studied that effects of parameters on surface roughness of samples by selective laser melting in this paper. The main processing parameters used to control the surface roughness of melted layers are laser power, scanning velocity, overlap ratio, slice thickness and incline angle. In experiments, an orthogonal experimental design on laser power, scanning velocity and overlap ratio was employed to find the changing rules of the horizontal surface roughness, find effect of incline angle on the incline surface and effect of slice thickness on the vertical surface roughness. The results show that the overlap ratio is the most important factor to affect the horizontal surface roughness of melted layers among the three parameters. The surface roughness increases with increasing overlap ratio. When the other parameters are constant, overlap ratio 30% can be used to achieve melted layers with the best surface quality in our experiments. The bigger incline angle is, the smaller roughness is. The smaller slice thickness is, the smaller roughness is.