Optimization of machining parameters in abrasive water jet cutting of stainless steel 304

Abstract

Abrasive waterjet cutting is a newer machining process effectively used for cutting various materials ranging from soft materials like rubber to hard materials like Inconel. This paper addresses the influence of input process parameters on material removal rate and kerf top width in processing stainless steel grade 304. The main input parameters are water jet pressure, feed rate and abrasive flow rate. Three different levels of input parameters are selected to generate a design table using L27 orthogonal array. Experiments were conducted and the effect of input parameters on output responses are studied.. The optimum values of the parameters found using Grey Relational Analysis and Response Surface Methodology are in accordance with each other. A study of the response graph shows that Material Removal Rate is influenced by Water Jet Pressure and Feed Rate while the influencing factors for Kerf Top Width are Feed Rate and Abrasive Flow Rate. The optimum parameter values are also used in the generated Regression Equations and the resulting responses have been validated with the experimental values. The validation showed that the error between the experimental and regression equation values are within limits and so the regression equations can be used for calculations.