Authors: Swapan Barman; Ram Prakash Sharma; Asit Baran Puri
Addresses: CSIR-Central Mechanical Engineering Research Institute, Durgapur – 713209, India ' CSIR-Central Mechanical Engineering Research Institute, Durgapur – 713209, India ' National Institute of Technology, Durgapur, Durgapur – 713209, India
Abstract: The influences of machining parameters has a like gap voltage, capacitance and spindle speed on machining performances for surface finish Ra and Sa of high aspect ratio through micro holes drilled in zirconium-based bulk metallic glass Vitreloy 1 or Vit 1 with cylindrical tungsten tool electrodes in micro electrical discharge drilling were studied. The experimentation was carried out adopting Taguchi's L27 (313) orthogonal array. The simultaneous effects of machining parameters on machining performance were studied by applying response surface methodology. Adopting analysis of variance technique, it was observed that the machining parameters selected have great significant effects on responses. Second order regression models were developed for responses and found excellent for acceptance. Predicted optimal designed value for responses was computed using Taguchi's algorithm. Validity of the models was checked statistically and found acceptable. The proposed model could be considered as valuable tools for process planning for cost effective machining of Vit 1. Tool electrode material tungsten was deposited on the hole surface as observed from energy dispersive X-ray spectroscopy study.
Keywords: micro electrical discharge drilling; MEDD; bulk metallic glass; surface texture Ra and Sa; Taguchi's orthogonal array; analysis of variance; response surface methodology; RSM.
International Journal of Machining and Machinability of Materials, 2017 Vol.19 No.3, pp.193 - 217
Received: 04 Nov 2015
Accepted: 04 Mar 2016
Published online: 02 May 2017 *