Authors: Rajesh Khanna; Hari Singh
Addresses: Mechanical Engineering Department, M.M. University, Mullana, 133207, Ambala, Haryana, India ' Mechanical Engineering Department, National Institute of Technology, Kurukshetra, 136119, Haryana, India
Abstract: The present paper identifies process parameters that affect metal removal rate and surface roughness in machining of cryogenic treated D-3 material on wire-cut electric discharge machine tool. Central composite design is used to plan and conduct the experiments. The regression is employed to develop empirical relationships between different process parameters and output responses, and subsequently to analyse and yield the optimal values of process parameters. As the effect of process parameters on metal removal rate and surface roughness is contrary, the problem is formulated as a multi objective optimisation problem and solved using weight method. Effort is made to find the machine settings to obtain maximum metal removal rate and minimum surface roughness. Confirmation experiments are also carried out which reflect that the developed mathematical models are appropriate for the effective machining of D-3 material. The optimal combination of WEDM process parameters obtained from the study satisfies the real requirement of quality machining of D-3 material in practice. In this research paper, cryogenic treatment of work piece is carried out before machining for improving the wear resistance of the material which is necessary for die manufacturing.
Keywords: D-3 material; desirability; multiobjective optimisation; performance evaluation; cryogenic treatment; response surface methodology; wire EDM; WEDM; electro-discharge machining; electrical discharge machining; metal removal rate; MRR; surface roughness; surface quality; cryogenic treatment; central composite design; CCD; wear resistance; die manufacturing.
International Journal of Machining and Machinability of Materials, 2013 Vol.14 No.1, pp.45 - 65
Received: 28 Dec 2011
Accepted: 06 Oct 2012
Published online: 26 Dec 2013 *