Title: Feasibility of using modified VPP approach in prediction of real time volume estimator (V_RT) in µEDM-drilling

Authors: Chandrakant Kumar Nirala; Probir Saha

Addresses: Indian Institute of Technology Patna, Patna 800013, Bihar, India ' Indian Institute of Technology Patna, Patna 800013, Bihar, India

Abstract: In this work, authors have proposed a modified volume removal per pulse (VPP) approach to predict real time volume estimator (V_RT) in µEDM-drilling. The present trend to compensate tool wear in µEDM-drilling uses the difference between target volume and the predicted V_RT. Therefore, an accurate prediction of V_RT is very important to achieve good dimensional accuracy. Here, target volume refers to the desired volume of the machined hole. According to the proposed approach, VPP was estimated considering two new aspects. First one is the number of actual contributing pulses (N_p) and latter one is the variation of VPP with respect to the machining depth. The pulses were identified by a newly developed pulse discrimination (PD) system. The validation results confirm well acceptability of the proposed approach in prediction of V_RT. This predicted V_RT, in combination with the target volume, could be used for online tool wear compensation in µEDM-drilling.

Keywords: micro EDM; microdrilling; volume removal per pulse; modified VPP; actual contributing pulses; pulse discrimination; real time volume estimator; tool wear; wear compensation; machining depth; electrical discharge machining; electro-discharge machining; hole drilling.

DOI: 10.1504/IJPTECH.2014.067739

International Journal of Precision Technology, 2014 Vol.4 No.3/4, pp.162 - 175

Received: 16 Aug 2014
Accepted: 18 Nov 2014
Published online: 28 Feb 2015 *

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