Abstract
A wide variety of materials are used in the automobile industry that includes casting tools, dies, studs, nuts & bolts, bearings, and punches, etc. These require high hardenability, great toughness, more strength, and good resistance to thermal shocks. Among various grades of steel, the EN31 fulfills all these qualities efficiently. But, due to its high hardness and strength, conventional machining of EN31 is not economical. Among various non-conventional machining processes, abrasive water jet machining is employed when there is a necessity for high surface finishing & fast cutting. This paper includes the machining of EN31 steel with an Abrasive Water Jet Machine. In this work, Pressure, Abrasive Mass Flow Rate, Standoff Distance & Traverse Speed (Quality) are considered as parameters, and hence their effects on the responses like Machining Time, Surface Roughness & Hardness are studied. With Grey Relational Analysis, all the selected parameters are optimized for; minimum machining time, minimum surface roughness & maximum hardness. The approach is used to obtain Grey Relational Grade (GRG) and hence the optimal solution is obtained.
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