Milling performance of titanium alloy based on short electric arc machining with direct current power source

摘要

In this study, we have proposed the use of direct current (DC) power source instead of pulsed power source for solving the problems of low material removal rate (MRR), high relative tool wear ratio (RTWR), and high specific energy consumption (SEC) in short electric arc machining (SEAM). The performance of SEAM with DC was significantly improved as compared to that with medium frequency pulse (MFP). The MRR of Ti6Al4V alloy during SEAM with DC exceeded 15100 mm(3)/min and the ideal MRR exceeded 60000 mm(3)/min. Further, the RTWR and SEC were 0.7% and 36.6 kJ/cm(3), respectively. The influence of tool electrode polarity and voltage on MRR, RTWR, SEC, and surface roughness were studied. The current and voltage during the entire process were measured by DEWESoft SIRIUSi multi-channel data acquisition system. Moreover, the surface morphology, cross section, chemical composition, and micro-hardness of Ti6Al4V after machining were also investigated.