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研究具有不同致密度的Ti-6Al-4V粉末冶金工件表面形貌,分析切削参数和致密度对其表面粗糙度的影响。Ti-6Al-4V粉末冶金工件表面出现因材料内部残余微孔隙而引起的微孔隙缺陷,且微孔隙缺陷随着粉末冶金材料致密度的减小而增大。随着工件相对致密度的降低,工件表面粗糙度先增大后降低。利用3水平4因素正交试验研究切削参数与材料致密度对工件表面粗糙度的影响,工件致密度对表面粗糙度的影响程度最小,在实际生产加工中可以忽略。获得已加工工件表面粗糙度的最优组合:切削速度为30 m/min、进给量为0.05 mm/r、切削深为1.5 mm和致密度为98.80%。
The surface morphology of Ti-6Al-4V powder metallurgy parts with different densities was studied, and the influence of cutting parameters and density on the surface roughness was analyzed. Ti-6Al-4V powder metallurgy workpiece surface due to residual microporosity within the material caused by micro-pore defects, and micro-pore defects with powder metallurgy material density decreases. With the relative reduction of the density of the workpiece, the workpiece surface roughness first increases and then decreases. The effects of cutting parameters and material density on the surface roughness of workpieces were studied by orthogonal experiment with 3 levels and 4 factors. The influence of work piece density on the surface roughness was the smallest. It can be neglected in the actual production and processing. The optimal combination of the surface roughness of the machined workpiece was obtained: the cutting speed was 30 m / min, the feed rate was 0.05 mm / r, the cutting depth was 1.5 mm and the density was 98.80%.