MATRIX MODELING OF SURFACE ROUGHNESS OBTAINED BY WIRE ELECTRICAL DISCHARGING MACHININGMATRIX MODELING OF SURFACE ROUGHNESS OBTAINED BY WIRE ELECTRICAL DISCHARGING MACHINING
It is known that the wire electrical discharge machining is a machining method which uses the electrical discharges developed between the workpiece and the wire tool electrode, in order to obtain distinct types of surfaces. This paper proposes a study concerning the influence exerted by some of the process input factors on the surface roughness parameter Ra, in case of a workpiece made of an alloyed steel. In order to develop an experimental research, a factorial experiment with six independent variables at two variation levels was used. As input factors, one took into consideration the workpiece thickness, current intensity average amplitude, wire axial tensile force, pulse on time, pulse off-time and wire electrode speed. Some empirical mathematical models were established and graphically represented, highlighting the influences of the input factors on the surface roughness parameter Ra. The matrix model of the process was made according to the Taguchi method requirements.
Figure 8. Effect of the pulse off time tb on the value of the surface roughness parameter Ra
2. Dodun O., Contributions concerning the optimization of the wire electrical discharge machining technology. Doctoral thesis (in Romanian). “Gheorghe Asachi” Technical University of Iaşi, Romania, (2000).
3. Kumar R., Singh S., Current research trends in wire electrical discharge machining: an overview, International Journal on Emerging Technologies, Vol. 3, No. 1, pp.33-40, (2012).
4. Lodhi K.B., Agarwal S., Optimization of machining parameters in WEDM of AISI D3 Steel using Taguchi Technique, 6th CIRP International Conference on High Performance Cutting, pp. 194 – 199, ( 2014 ).
5. Siva A. P., Tamil M. and Arkanti K., Investigations on Surface Characterisation of Wire Electric Discharge Machined Surface of Titanium Alloy, International Journal of Engineering Research and Technology, Vol. 6, No. 6, pp. 773-780, (2013).