To Study the Effects of Machining Parameters of Stainless Steel 316L for Biomedical use by EDM
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Date
2019-09-09
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MPUT, UDAIPUR
Abstract
Electric discharge machine has been acknowledged as better technique for surface modification of biomedical implants. It has many advantages over other previously used technique. Chemical vapour deposition CVD, Plasma vapour deposition PVD and anodising and nitriding etc. needs surface treatment before these technique as processed. This increases their processing cost. Even these techniques has weak adhesion bond and cannot sustain under repeated loading conditions in corrosive environment that’s why this techniques have become inefficient. Machining by EDM holds many advantages like wear resistance increases due to micro structural changes. Oxide and carbide layer is deposited over workpiece which enhances corrosion resistance of material. Machining of workpiece at high temperature increases hardness of material. Porosity of material is increased which encourages ingrowth of tissue and transportation of body fluid into pores which leads to improvedcell proliferation and adhesion. Biocompatibility of material is also improved.
Increases in SR of material increases the surface area available for interaction with the bone. Higher SR of biomaterial shows better bone fixation with it then smoother surfaces. In growth of tissues is revealed with higher SR. Main aim of increasing SR is to improve cellular activity. Higher SR obtained by EDM results in deposition of oxide and carbide layers on material which enhances corrosion resistance. Hence this study has aimed at increasing SR of machined material and simultaneously MRR is also calculated.
Stainless steel 316L has been used as workpiece as it is most commonly used material in biomedical due to easy availability, low cost, excellent fabrication properties, good corrosion resistance, high fatigue strength and good biocompatibility. Graphite as electrode has been used as it has high melting point which makes it more stable than other electrode material. It is comparatively cheaper than other electrodes. It has low density and can be easily machined into desired shape of electrodes. Graphite produces more carbide phases on EDM machined surfaces which increases corrosion resistance of workpiece.
Parametric study has been carried out aiming at increase of SR of material for biomedical use. Higher the SR better is cellular activity. Investigation of study reveals that SR increases more with pulse on time, then current and servo voltage has very less effect. With the increases of pulse on time and current SR also increases. MRR also increases with increase in current, drops with increase of pulse on time as after some value of pulse time
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MRR starts to drops due to formation of high plasma channel which obstructs the transfer of energy between inter electrode gap. Servo voltage also have very less effect on MRR.
Description
To Study the Effects of Machining Parameters of Stainless Steel 316L for Biomedical use by EDM
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Citation
Chauhan P. And Saloda M.A.