Investigation and Optimization of Surface Roughness for Wire Cut Electro Discharge Machining of SS 304L using Taguchi Dynamic Experiments

摘要

Machining parameters tables provided by the machine tool manufacturers often do not meet the operator requirements and sometimes even do no provide efficient guidelines to manufacturing engineers. This may lead to the act of adjustment in the customer's requirements, which may result in poor quality, and ultimately rejection of the final product by them. Hence, a suitable selection of machining parameters of CNC wire cut electro discharge machining (WEDM) process is necessary. In this, present study, optimization of surface roughness using Taguchi's dynamic design of experiments is proposed for WEDM operations. Experimentation was planned as per Taguchi's L'32 (2~1 × 4~4) mixed orthogonal array. Each experiment has been performed under different cutting conditions of gap voltage, pulse ON time, pulse OFF time, wire feed and dielectric flushing pressure. Stainless Steel grade 304L was selected as a work material to conduct the experiments. From experimental results, the surface roughness was determined for each machining performance criteria. Signal to noise ratio was applied to measure the performance characteristics deviating from the actual value. Finally, experimental confirmation was carried out to identify the effectiveness of this proposed method.