Milling performance of titanium alloy based on short electric arc machining with direct current power source
- PDF / 8,798,979 Bytes
- 12 Pages / 595.276 x 790.866 pts Page_size
- 6 Downloads / 233 Views
ORIGINAL ARTICLE
Milling performance of titanium alloy based on short electric arc machining with direct current power source Kai Liu 1 & Jianping Zhou 1 & Zongjie Zhou 1 & Yan Xu 1 & Guoyu Hu 1,2 & Li Zhang 1 & Dan Song 1 Received: 15 May 2020 / Accepted: 10 August 2020 # Springer-Verlag London Ltd., part of Springer Nature 2020
Abstract 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 mm3/min and the ideal MRR exceeded 60000 mm3/min. Further, the RTWR and SEC were 0.7% and 36.6 kJ/cm3, 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. Keywords Titanium alloy . Short electric arc machining (SEAM) . Material removal rate (MRR) . Relative tool wear ratio (RTWR) . Specific energy consumption (SEC) . Scanning electron microscopy (SEM)
1 Introduction Owing to their excellent physical and mechanical properties, titanium alloys are widely used in several fields such as automobile manufacturing, aerospace and ship industries, and biomedical applications. However, the machining of titanium alloys is extremely challenging and faces several problems, such as high relative tool wear ratio (RTWR), high cutting temperature, and high cutting stress [1–3]. Electric discharge machining (EDM) is a non-traditional method, which can be used for machining conductive materials with arbitrary physical and mechanical properties, so it is more suitable than conventional mechanical methods for machining very difficult-to-machine (DTM) materials such as titanium alloys [4]. However, compared with conventional machining methods, EDM exhibits lower efficiency, high risk of tool wear, large energy
* Jianping Zhou [email protected] 1
School of Mechanical Engineering, Xinjiang University, Urumqi 830047, China
2
State Key Laboratory for Manufacturing Systems Engineering, Xi’an Jiaotong University, Xi’an 710049, China
consumption, and hazardous emissions that cause environmental pollution, which severely limit its applications. Several researchers have focused on the improvement of EDM by controlling various aspects such as machining mechanism, gap medium, and auxiliary functions. For example, Kunieda et al. [5] proposed the use of two electrodes for connecting the positive and negative poles of the power supply to realize simultaneous discharge from the two poles. Jeswani et al. [6] suggested to mix a ce
Data Loading...
