An Investigation on Wear of Shallow Cryogenic Treated Wire in Wedm
The wire electrical discharge machining (WEDM) is widely used for machining workpieces having complex geometries. A wire electrode of diameter 0.25 mm is moved coaxially between two guides and electrical energy in the form of electrical pulses is applied to remove material from the workpiece. In this study, the effect of key process parameters on wire wear of shallow cryogenic treated brass wire electrode used in WEDM was investigated experimentally. Five process parameters, namely Type of wire, Pulse width, Time between two pulses, Wire tension and Servo reference voltage have been considered. Taguchi experimental design has been applied to investigate the optimal parameters for minimum wire wear ratio (WWR). The experimental results indicate that Type of wire; Pulse width and Time between two pulses have a significant effect on WWR. The analysis of variance of mean and analysis of variance of S/N ratio on data was performed to identify the significant factors in order to establish the relative significance of parameters for WWR. It is found experimentally that shallow cryogenic treatment decreases the WWR. Increasing pulse width increases the WWR, where as increasing Time between two pulses decreases WWR. The results have been validated by three confirmation runs for optimum WWR.
J. Kapoor et al., "An Investigation on Wear of Shallow Cryogenic Treated Wire in Wedm", Materials Science Forum, Vol. 701, pp. 31-42, 2012