激光选区熔化TC4钛合金工艺参数对成形件表面质量的影响

Effect of Process Parameters on Surface Quality of TC4Alloy by Laser Selective Melting

采用正交试验,研究在选区激光熔化快速成形的过程中,激光功率P、扫描速度v、铺粉厚度h以及扫描间距s4个参数对TC4钛合金成形件上表面粗糙度、侧面粗糙度和表面硬度的影响规律。研究表明,4个参数对上表面粗糙度影响的重要次序为激光功率、扫描速度、铺粉厚度、扫描间距;对侧面粗糙度影响的重要次序为激光功率、铺粉厚度、扫描速度、扫描间距;对表面硬度影响的重要次序为激光功率、铺粉厚度、扫描间距、扫描速度。试验可得形成TC4成形件表面质量的最佳工艺参数为:激光功率200W,扫描速度600m/s,铺粉厚度0.04mm,扫描间距0.06mm。

In this paper,orthogonal experiments are used to study the effects of the four parameters of laser power,scanning speed,powder thickness,and scanning spacing on the surface roughness and side roughness of TC4titanium alloy molded parts during the rapid prototyping by laser melting and the influence law of surface hardness.Results show that the important order of the four parameters on the upper surface roughness is laser power,scanning speed,coating thickness,and scanning distance,and the important order of influence on the side surface roughness is laser power,powder thickness,scanning speed,and scanning spacing.The important order of influence on surface hardness is laser power,powder thickness,scanning spacing,and scanning speed.Experimental results show that the optimized process parameters for forming the surface quality of TC4molded parts are laser power 200W,scanning speed 600m/s,spreading thickness 0.04mm,scanning distance 0.06mm.