# Parametric Investigation of Die-Sinking EDM of Ti6 Al4V Using the Hybrid Taguchi-Rams-RATMI Method
## 1 Introduction
The goal of [PERSON] and [PERSON]'s [27] study was to use RSM and VIKOR techniques to predict optimal EDM settings for optimum productivity and lowest surface integrity. The outcomes validated EDMed products' improved accuracy and MRR. The work by [PERSON] et al. [28] shows that cryogenic treatment improves the mechanical and thermal characteristics of titanium alloys, indicating a useful technique for EDM machining of titanium Grade 2 alloy. The work by [PERSON] et al. [29] shows that during EDM of titanium Grade 2, current and pulse-on time have a substantial influence on MRR, TWR, and surface roughness. According to research by [PERSON] et al. [30] on surface finish characteristics in Ti-5 Al-2.5 Sn titanium alloy EDM, the best surface structure is produced using copper-tungsten electrodes. Using the Taguchi approach, [PERSON] and [PERSON]'s [31] work on micro-EDM for titanium alloy machining discovered that important factors like voltage and current had little effect on quality features. The MRR, TWR, and surface roughness are all highly impacted by current and pulse-on time, according to [PERSON] et al. 's [32] study on titanium Grade 2 alloy electric discharge machining. The wear rate and machinability of tools can be improved by surface modification, grain refinement, and cryogenic treatment, according to [PERSON] et al. 's [33] work on EDM of titanium and titanium alloys. Hybrid techniques may also be advantageous. Through the use of micro-electric discharge drilling, [PERSON] et al. [34] discovered decreased burr formation, recast layer error, and capacitance and voltage levels in titanium Grade 2 alloy. Ti6 Al4V ELI Grade 2 alloy machining for biomedical applications was enhanced by [PERSON] et al. 's [35] research on environmentally safe surfactant additives, leading to improvements in MRR, TWR, surface roughness, overcut, and corrosion resistance. Although a great deal of research has been conducted on EDM of different materials, there are still certain gaps in our understanding of Ti6 Al4V that need to be filled. A thorough optimization framework is still required despite the fact that several studies have examined the impact of EDM settings on MRR, TWR, and surface roughness for Ti6 Al4V. Previousstudies have frequently concentrated on discrete characteristics like voltage, pulse length, and current. A more comprehensive optimization strategy is necessary, nevertheless, due to the intricate relationships between these variables and how they all interact to affect performance indicators. There has been little published research on Ti6 Al4V and copper electrodes. The electrode material selection and shape have a significant influence on the EDM process's effectiveness and caliber. While research concentrating on the performance of copper electrodes especially with Ti6 Al4V is scarce, copper electrodes are widely employed. Further investigation is needed on how EDM affects the subsurface properties and surface integrity of Ti6 Al4V. Although surface roughness is commonly recorded, other features, like TWR, MRR, machined depth of cut, etc., have not been well studied. Their application to Ti6 Al4V is, however, somewhat unexplored. Tool life, surface quality, and MRR might all be significantly increased by looking at these factors. Addressing these research gaps will significantly enhance the understanding and application of EDM for Ti6 Al4V. Comprehensive studies focusing on parameter optimization, surface integrity, thermal and mechanical effects are essential for advancing the state of the art in EDM technology for this critical material. By addressing the challenges associated with machining Ti6 Al4V and exploring the potential of optimized EDM processes, this research seeks to advance the application of EDM in high-performance materials and pave the way for more efficient and reliable manufacturing practices in industries that rely on Ti6 Al4V.