International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 04 Issue: 07 | July -2017
p-ISSN: 2395-0072
www.irjet.net
Parametric Optimization of Graphite Plate by WEDM TOMPE S.V.1, N.A. RAWBAWALE2 1PG
Student, Department of Mechanical Engineering, College of Engineering Ambajogai Maharashtra, India 2Associate Professor, Department of Mechanical Engineering, College of Engineering Ambajogai Maharashtra, India ---------------------------------------------------------------------***---------------------------------------------------------------------
Abstract - Wire electrical discharge machining is an
optimize the process parameter is to overcome irregularities and to achieve the surface roughness and metal removal rate.
emerging technology in the area of machining to very complex micro products. WEDM is a completely complex technique regarding the distinct method. Experimental investigation has been carried out in multi process micro EDM machine. WEDM technique is a highly complex, time varying & stochastic system, which is used in the fields of dies, moulds, precision manufacturing and contour cutting etc. It is especially used for the aerospace and medical industries. The complex shape can be generated with high degree of accuracy and surface finish using CNC WEDM. Hence suitable selection of input variable for the WEDM process depends heavily on the operator’s technology & experience. The literature survey has revealed that a little research has been conducted to obtain the optimal levels of machining parameters to machine on graphite material. The objective of optimization is to attain the minimum surface roughness and maximum material removal rate. In this present study the work piece of graphite plate is used. The Brass wire of 0.25mm diameter is used as a tool and distilled water is used as dielectric. The experimentation was planned as per Taguchi’s L9 Orthogonal array for machining of graphite material. For each experiment surface roughness and MRR is determined by using contact type surface coder and display screen of machine directly.
Fig -1: Schematic diagram of WEDM
2. LITERATURE REVIEW Ashish Srivastava et al [1] have studied on composite material of Al2024. They selected three levels of each parameters like current, pulse on time and strengthening proportion on surface finish and MRR. The response surface methodology (RSM) process was applied to optimize the machining parameters for minimum surface roughness and most MRR. It was determined that surface roughness increase in peak current and pulse on time.
Key Words: WEDM,MRR,SR,RA,TON,TOFF
1.INTRODUCTION The Wire electrical discharge machining is one of the important non-traditional machining processes. There are various materials having high hardness that can be easily machined by generating sparks at every few microseconds. There is sparking mechanism which generates the spark between wire electrode and work piece, where the temperature reaches to about 12,000°C. The dielectric fluid acts as medium for passing of spark current from electrode to the work piece. Typically the gap between wire and work piece for WEDM varies from 0.025 to 0.05 mm and this gap is constantly monitored by a computer controlled system. Now days the numerical control is mainly used according to the customer requirement for machining. It is widely used in the aerospace and automotive industries. However, the selection of cutting parameters for obtaining higher cutting efficiency or accuracy in wire EDM is still not widely focused, even with the most up-to date CNC WEDM machine. The main aim to
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Neeraj Sharma et al [2] have highlighted in nursing improvement of eight management factors on MRR, surface roughness and the width of cut made by saw (kerfs) in WEDM technique for steel D2. It has been found that pulse on-time is the foremost vital parameter on roughness, kerfs and material removal rate. P.K. Jain and N.K. Jain [3] have studied the impact of parameters on cutting speed and dimensional deviation for WEDM exploitation High-strength low-alloy steel. Response surface methodology was utilized to optimize the strategy parameter. It was seen that the foremost distinguished issue for cutting speed, pulse-on time.
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