Evaluating Optimal Parameters for Machining Selective Laser Melting Titanium Alloy Using Wire Cut Electrical Discharge Machining

Evaluating Optimal Parameters for Machining Selective Laser Melting Titanium Alloy Using Wire Cut Electrical Discharge Machining

Ashwin Polishetty (AUT Univesity, Auckland, New Zealand) and Guy Littlefair (AUT Univesity, Auckland, New Zealand)
DOI: 10.4018/IJMMME.2020070104
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Abstract

Titanium is known for its poor machinability characteristics due to its low thermal conductivity and high chemical reactivity. This article explores the machinability characteristics of selective laser melting (SLM) titanium alloy Ti-6Al-4V using wire cut electrical discharge machining (WEDM). For titanium alloys, exploring non-traditional machining operation such as WEDM is critical for a material failure or success in a design application. The research is to study the effect of parameters such as servo voltage, pulse on/off, and machining speed with respect to wire tension and wire feed rate on machinability. The outputs under consideration for evaluating machinability are metal removal rate (MRR) and surface finish under minimal interruption due to wire snaps. The article concludes by identifying the optimal factors responsible to produce an efficient and accurate cut with a minimum downtime.
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Introduction

Titanium alloys are reputed for their material properties such as high specific strength, biocompatibility and corrosion resistance. Despite their superior properties, their extraction, fabrication and production are expensive due to the requirement of a protective environment, high energy consumption and various other manufacturing associated problems (Boyer, 2010). Titanium alloy, Ti-6Al-4V, having superior mechanical properties, is often referred to as the work horse of titanium alloys and is preferentially used in a variety of applications in the aerospace, chemical, biomedical and automotive industries (Shunmugavel, Polishetty, & Littlefair, 2017). To decrease the overall cost of production and to improve productivity, research on alternative manufacturing methods of titanium alloy has been the primary point of focus (Lutjering & Williams, 2007). In recent years, additive manufacturing (AM) has been widely used for fabricating near-net shape titanium alloy (Ti-6Al-4V) products due to its advantageous features like freedom of design, on-demand manufacturing and high productivity. Titanium alloys are used to manufacture components, where the requirements of design reliability and superior material properties such as high corrosion and thermal resistance, high robustness, high strength to weight ratio and outstanding tendency of alloying, is a priority (Koster, Field, Kahles, Fritz, & Gatto, 1970). The higher melting point of titanium alloy makes it a superior alloy in comparison to other metals. However, some of the material properties of titanium such as low thermal conductivity and high chemical reactivity leads to poor machinability characteristics (Che-Haron, 2001; Polishetty, Shunmugavel, Goldberg, Littlefair, & Singh, 2017). The material used for this project is a SLM titanium alloy, Ti-6Al-4V. SLM is suitable for rapid generation of metal 3D print prototypes. The material properties of SLM titanium alloy, Ti-6Al-4V are given in Table 1.

Table 1.
Material properties of SLM titanium alloy, Ti-6Al-4V
MaterialDensity, lbs./inch3Ultimate Tensile Strength (UTS), MPaYield strength, MPaYoungs Modulus, GPa
SLM Ti-6Al-4V0.16950880114

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