钛合金TC9正交车铣加工表面粗糙度研究

Investigation on Surface Roughness in Orthogonal Turn-Milling of Titanium Alloy

首先建立了正交车铣工件已加工表面粗糙度的理论模型,分析了主要切削用量对工件表面粗糙度的影响规律。然后采用单因素试验法,进行了正交车铣TC9钛合金的切削试验,研究分析了正交车铣的主要切削用量(如铣刀与工件的转速比、轴向进给量、偏心量等)对已加工表面粗糙度的影响。试验研究表明,已加工表面粗糙度随转速比和偏心量的增加而降低,随轴向进给量的增加而增大;表面粗糙度Ra可以控制在1μm以内,因此正交车铣可以实现回转类零件的精加工。

A model of the surface roughness in orthogonal turn-milling is established.The relationship between main cutting parameters and the machined surface roughness is analyzed.Turn-milling experiments of Ti-6.5Al-3.5Mo-2.5Sn-0.3Si （TC9 for short） are carried out with an end milling cutter.The effects of the main cutting parameters in orthogonal turn-milling,such as cutter and workpiece rotary speed ratio,axial feed and accentric,on surface roughness are studied.The results obtained indicate that the surface roughness decreases with the increase in cutter and workpiece rotary speed ratio and eccentric.However,the tendency of the surface roughness with respect to axial feed is contrary to the last one.Surface quality beneath Ra＜1 μm can be achieved.So high quality surface can be obtained,when the rotationally symmetrical workpieces is processed in orthogonal turn-milling.