Ti-6Al-4V合金电脉冲辅助车削加工实验研究

Experimental Research on Electropulsing-Assisted Turning of Ti-6Al-4V Alloy

摘要:

针对钛合金材料切削加工困难，将电脉冲引入到Ti-6Al-4V合金的车削加工中，研究了电脉冲对主切削力、表面加工硬化及加工质量的影响，并借助三维数字显微镜和扫描电子显微镜对切削表面、切削变形层和切屑的微观形态进行观察。结果表明：相比于普通车削，当平均电流密度为1.11 A?mm^-2、最大电流密度10.19 A?mm^-2和频率为300 Hz时，电脉冲辅助车削Ti-6Al-4V合金可使主切削力下降27.3%，表面加工硬化减小16.6%，轴向表面粗糙度降低18.7%。该研究结合电致塑性理论，对电脉冲辅助车削加工的作用机理做出了解释。

Abstract:

Due to the poor machinability of the titanium alloys， electropulsing was introduced into the turning process of the Ti-6Al-4V alloy， and the effect on the main cutting force， surface work hardening， and machined quality was analyzed. The micro-morphologies of the machined surface， cutting deformed layer， and chip were observed by using a three-dimensional digital microscope and scanning electron microscope. The results indicate that compared with traditional turning， the degrees of reduction for main cutting force， surface work hardening， and axial roughness were 27.3%， 16.6%， and 18.7% using the electropulsing-assisted turning at the average current density of 1.11 A?mm^-2， the maximum current density of 10.19 A?mm^-2 and frequency of 300 Hz. Combined with the theory of electroplasticity， the study explained the machining mechanism of the electropulsing-assisted turning process.