7075-T6铝合金单向超声振动车削表面质量及形貌特征

对7075-T6铝合金试件采用普通切削(CT)和振动切削(UVC)加工方法进行了加工实验,分析了2种切削加工方法在不同参数下对铝合金试件加工表面粗糙度的影响.试验研究结果表明:在相同的进给量和切削深度情况下,随着车削速度的变化,普通切削获得的加工表面粗糙度先减小后增大再减小,但随着转速的增大进入高速切削后,工件表面粗糙度值逐渐趋于稳定;随着进给量的增加超声振动硬车削与普通硬切削加工表面粗糙度都呈上升趋势,超声振动切削表面粗糙度较小;在切削速度、进给量相同的条件下,普通硬质切削7075铝合金加工表面粗糙度随着切削深度的增加而增加,而超声振动切削7075铝合金加工表面粗糙度随着切削深度的增加先减小后增加.通过对获得实验数据的分析以及对车削加工获得的加工表面显微形貌的观测,证实了超声振动加工在难加工材料加工中的优势.

Research on unidirectional ultrasonic vibrations turning 7075-T6 aluminum alloy surface quality and morphology

7075-T6 aluminum alloy specimens were tested for machining experiments by using ordinary cutting (CT) and the vibration cutting (UVC) processing methods, to analyze the influence of cutting parameters on the work piece surface roughness. Experimental results show that: In the same amount of feed and depth of cut, speed with the turning changed, the surface roughness of ordinary cutting reduced first decreases and then increases again, but with the speed increased into the high-speed, the surface roughness become stable; The surface roughness uptrend with the feed rate increased of ultrasonic vibrations hard turning and ordinary hard cutting; In the same cutting speed and feed rate, with cutting depth increased ,7075 Aluminum ordinary hard cutting surface roughness increased, but the ultrasonic vibration cutting surface roughness first decrease and then increase. Through the analysis of experimental data obtained and the observations of the microscopic morphology of the machined surface after turning, the advantage of ultrasonic vibration machining in difficult materials processing is confirmed.