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Major Developments in EDM Surface Alloying Using Composite Material Tool Electrode Parveen Goyal

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Major Developments in EDM Surface Alloying Using Composite Material Tool Electrode Parveen Goyal International Journal of Innovative Technology and Exploring Engineering (IJITEE) ISSN: 2278-3075, Volume-8 Issue-12, October 2019 Major Developments in EDM Surface Alloying using Composite Material Tool Electrode Parveen Goyal V Electrode Abstract: Electric Discharge alloying/Coating (EDC) is an emerging field for the surface modification of advanced Spark Spark engineering materials like tool steel, high heat resistance alloy, Erosion Erosion titanium alloy etc. The advanced engineering materials have good mechanical properties and are used for the engineering applications like dies, aerospace, and automotives. To treat these difficult-to-machine advanced engineering materials with new challenges, numerous advancements in electrical discharge machining (EDM) processes have been carried out. Electrode materials for EDM are usually made up of copper, and its alloys. Proper selection with composition of electrode materials are required to avoid cracks, residual stresses etc during or after Electrical Discharge Machining and at the same time to have better surface finish and material removal rate and lower tool wear rate of the electrode. Further electrodes can be prepared by Dielectric Work piece different methods like powder metallurgy, stir casting technique etc. This paper presents the brief details of effect of different electrodes on the surface and machining characteristics. Fig. 1. Schematics of EDM Process Keywords: Alloying, Composite, EDM, Electrode. Different theories are there to describe the spark erosion process between tool and workpiece. Electromechanical I. INTRODUCTION theories suggest that abrasion of the material is due to the EDM is a material removal process which involves melting concentrated electric fields and this theory neglects any and vaporization of the electrically conductive workpiece thermal effect. materials by very short duration electrical discharges. The basic process of metal removal is due to discharge of electric current between a thin gap across the tool and the work piece [1-3]. The tool (cathode) as well as the workpiece (anode) remains immersed in a hydrocarbon dielectric medium throughout the machining processes as shown in figure 1. The temperature of each discharge ranges between 10,000-20,000°C. This technique is widely used in aerospace, mould making, press tools and dies, biomedical and automotive industries [4-5]. The efficiency of the process and quality of the machined surface depends on various input factors like spark gap, voltage, pulse on time, Polarity, peak current, tool material, work piece material and dielectric medium. Fig. 2. EDM input process parameters and performance parameters Revised Manuscript Received on October 05, 2019. * Correspondence Author Parveen Goyal*, Mechanical Engineering Department, UIET, Panjab University, Chandigarh, India. Email: [email protected] Retrieval Number: L25311081219 /2019©BEIESP Published By: DOI: 10.35940/ijitee.L2531.1081219 Blue Eyes Intelligence Engineering 4585 & Sciences Publication Major Developments in EDM Surface Alloying using Composite Material Tool Electrode Thermo mechanical theory suggests that material is melted [9] was formed. due to electrical effects of the discharge. While thermoelectric 3 Mohri et Carbon Cu, Al, Composite structured al. 1993 steel , WC, Ti electrode was used for theory suggests that very high temperature due to high [10] aluminiu surface modification. intensity of the discharge current is responsible for the m Modified surfaces were material removal in EDM and this theory is well supported by having higher wear and corrosion resistance and experimental data. The performance output parameters and less cracks. the process parameters for EDM process are shown in figure 4 Sidhu et Al/SiC- copper Higher metal transfer 2. al, 2013 MMCs electrode was observed with the Electrode material must exhibit desirable properties i.e. [11] graphite copper electrode as electrode compared to graphite should be able to efficiently remove material from the electrode. workpiece. The available literature works in this field reveals that there is a need to find cost effective and efficient EDM 6 Tsuneka Al Ti-Al Composite layer of Ti-Al wa et al, (64%-36 with thickness of 100µm electrode. The materials for electrode are generally copper 1994 %) were found. The and their alloys, aluminum and graphite due to their excellent [12] machined surface was electrical and thermal conductivity. found to be having fine dendritic precipitates of titanium carbide. II. NEED FOR SURFACE MODIFICATION 5 Samuel Many Copper Metal transport from the M. P. Et tungsten copper tungsten To improve the mechanical, thermal and tribological behavior al , 1997 electrode were observed of the machined surface, surface modification is required, the (1997) using electron surface of the machined components may be modified by [13] spectroscopy (for diffusion of various elements therefore forming a layer on the chemical analysis) machined surface with desired microstructure and properties 8 Kruth et Mild Many Electrodes fabricated by al, 1998 steel types powder metallurgy have [6]. [14] high tendency of surface As machined components have to be used in severe practical alloying as compared to conditions like high temperature, cyclic and continues conventional metallic loading, therefore premature failures of the casted electrodes. 7 Hwang et Ni Ti-Gr Enhancement in the components may occur resulting in thermal cracks, stress al, 2010 (Graphite Surface was observed corrosion , fatigue etc. Therefore to avoid these failures, [15] ) Multi with better surface materials are required to be surface treated. The surface layered finish, the cracks were treatment results in modified grain structure and composition electrode also fund to be reduced. s of the machined surface. 8 Stambek 5083 Al Si-Fe Micro hardness of 5083 The layer formed on the surface of the machined component ova et al, alloy Al enhanced and same has different structure and composition. This surface layer 2012 happended to corrosion with desirable composition and properties can be obtained [16] resistance also. with controlled process while on the other hand there can be 9 M M Sari AISI H13 Cu The surface modification et.al, tool steel of AISI H13 tool steel, cracks and other negative effects in case of uncontrolled 2012 was studied, It was process [7]. Another way to achieve desirable surface [17] observed that EDM modification is through additions of powder in dielectric process become more fluid. efficient by mixing multi walled carbon nanotubes Surface alloying is required to make the component robust in in the dielectric fluid. adverse condition like the desirable elements e.g. Cr can 10 Furutani carbon copper Titanium carbide layer diffuse to the Die steel work piece to improve its corrosion et al, steel electrode was observed when resistance. 2003 EDM machining of [18] carbon steel with copper electrode (negatively III. ACHIEVEMENTS IN THE FIELD OF SURFACE ALLOYING polarized) with titanium powder mixed dielectric, The significant achievements in the field of EDM surface titanium was observed to alloying or modification have been presented in table 1. be present in the surface Table- I: Key achievements in surface alloying using IV. CONCLUSION EDM For good consistence performance, EDM machined parts should be able be withstand adverse conditions like High Sr Authors Work Tool Achievements No. material material temperature, wear friction, corrosion etc. Surface 1. Gill et al, EN31 Cu-Cr-Ni Electrodes fabricated by modification with suitable and controlled alloying elements 2015 powder metallurgy can provide high surface hardness with better resistance to [8] process were used to wear and corrosions. The technique has been found to be investigate the surface more useful where electrodes are fabricated by powder modified by electric discharge machining. metallurgy process. Also desired alloying elements with 2 Klocke F. Inconal Tungsten In the presence of Al and et al, 718 Silicon powder mixed in 2004 dielectric, a grey zone Retrieval Number: L25311081219 /2019©BEIESP Published By: DOI: 10.35940/ijitee.L2531.1081219 Blue Eyes Intelligence Engineering 4586 & Sciences Publication International Journal of Innovative Technology and Exploring Engineering (IJITEE) ISSN: 2278-3075, Volume-8 Issue-12, October 2019 varying concentration can be made by this technique. Surface suspended in working oil”, Proceedings of the American Society for alloying is very useful in aerospace industries where wear Precision Engineering, Vol. 30, 2003, pp. 547–550. resistance of Al alloys can be improved with this process. It has been observed that addition of different powders like Cr, AUTHORS PROFILE Al, Si, Cu, Ni, Ti etc resulted in increase in wear and corrosion resistance, micro hardness and decrease in surface Dr. Parveen Goyal completed his Ph.D. degree from roughness, cracks. There is a great scope of research work in Panjab University in 2018. He received his M.E. degree from PEC also. This author is presently designated as important alloying elements/materials like manganese, Assistant Professor at UIET, Panjab University, vanadium, carbon nanotubes etc as very little work for the Chandigarh. He has over 12 years of teaching and research same has been reported and this can be further extended to experience. super alloys and composite materials. Also hardly any work has been reported for the surface allying using electrode tool fabricated by stir casting technique. REFERENCES 1. N. M. Abbas, D. G.
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