Feasibility Assessment MRR and Surface Roughness on Inconel 825 by Abrasive Water Jet Machining Process

The creation of rectangular pockets is a developing area where abrasive water jet machining (AWJM) is utilized. The current trend highlights an increasing focus on milling applications in the AWJM process. This research included performing experiments on Inconel 825 to evaluate the practicality of using the AWJM technique for producing 3D features, such as pockets sized 10mm x 10mm. A design of experiments based on the Taguchi method was utilized, concentrating on the input variables: step over (SO), traverse speed (TS), pressure (P), and abrasive flow rate (AFR) as the variables of the process. The parameters were changed at three levels, maintaining a standoff distance (SOD) of 2 mm, an orifice diameter of 0.35 mm, and using garnet 85# for the abrasive material size. The output parameters obtained, specifically Depth Of Cut (DOC), Material Removal Rate (MRR), and Surface Roughness (Ra), were evaluated through two methods: Hatch strategy and Spiral strategy. A variance analysis was conducted to investigate the interactions between the process parameters and to calculate the F value. The results showed that the traverse speed and step over greatly affected the output parameters DOC, MRR, and Ra.