Modeling of material removal rate in electric discharge grinding process

Abstract The mechanism of material removal in electric discharge grinding (EDG) is very complex due to interdependence of mechanical and thermal energies responsible for material removal. Therefore, on the basis of conceived process physics for material removal, an attempt has been made to predict the material removal rate (MRR). The proposed mathematical model is based on the fundamental principles of material removal in electric discharge machining (EDM) and conventional grinding processes. The inter-dependence of the thermal and mechanical phenomena has been realized by scanning electron microscopy (SEM) characterization of the samples machined at different processing conditions. The key input process parameters like pulse on time, pulse current, gap voltage, duty cycle, pulse off time, frequency, depth of cut, wheel speed and table speed are co-related with MRR for three distinct idealized processing conditions. The constant showing the extent of interdependence of two phenomena were evaluated by experimental data. The obtained expressions of MRR have been validated for processing conditions other than those used for obtaining constants. It was found that the discharge energy plays prominent role in material removal. The percentage difference in experimental findings and theoretical predictions was found to be less than 3%.

[1]  K. Rajurkar,et al.  Investigation of the relationship between the white layer thickness and 3D surface texture parameters in the die sinking EDM process , 2005 .

[2]  G. K. Lal,et al.  Experimental investigations into electrical discharge machining with a rotating disk electrode , 1993 .

[3]  K. Shu,et al.  Study of electrical discharge grinding using metal matrix composite electrodes , 2003 .

[4]  V. K. Jain,et al.  Parametric Study of Temperature Distribution in Electrodischarge Diamond Grinding , 2004 .

[5]  V. K. Jain,et al.  Theoretical Analysis of Thermal Stresses in Electro-discharge Diamond Grinding , 2004 .

[6]  G. K. Lal,et al.  Stochastic simulation approach to modelling diamond wheel topography , 1997 .

[7]  P. V. Rao,et al.  Surface integrity and material removal mechanisms associated with the EDM of Al2O3 ceramic composite , 2009 .

[8]  Stephen Malkin,et al.  Grinding Mechanisms for Ceramics , 1996 .

[9]  G. K. Lal,et al.  A model for the topography of diamond grinding wheels , 1993 .

[10]  G. K. Lal,et al.  Mechanism of material removal in electrical discharge diamond grinding , 1996 .

[11]  B. Min,et al.  Electric Field Analysis for Micro-EDM Deburring Process , 2008, International Conference on Smart Manufacturing Application.

[12]  Kuen Ming Shu,et al.  A study of electrical discharge grinding using a rotary disk electrode , 2008 .

[13]  Mukund R. Patel,et al.  Theoretical models of the electrical discharge machining process. I. A simple cathode erosion model , 1989 .

[14]  V. K. Jain,et al.  Temperature distribution in the workpiece due to electro-discharge diamond surface grinding using FEM , 2005, Int. J. Manuf. Technol. Manag..

[15]  Ioan D. Marinescu,et al.  Investigation of pre-dressing time for ELID grinding technique , 2004 .

[16]  S. S. Pande,et al.  Development of an intelligent process model for EDM , 2009 .

[17]  G. K. Lal,et al.  Grinding of cemented carbide with electrical spark assistance , 1997 .

[18]  Sounak Kumar Choudhury,et al.  Prediction of wear and surface roughness in electro-discharge diamond grinding , 2007 .