Comparison of HSS (M35) and CrN tool performance in CNC drilling operation of AA3003-H14 material to maximize the material removal rate

Abstract

• The performance comparison of HSS (M35) coated tool and CrN coated tool to improve material removal rate in the drilling of AA3003-H14. • Material removal rate of the drilled specimens are calculated without compromising the roundness quality, roundness error percentage is measured using imageJ software. • Statistical Analysis performed using SPSS software to check the significance value of obtained results. • Within the limits of this study, CrN coated tool performance was better compared to HSS (M35) in aspect of Material Removal Rate and Roundness Quality. The performance comparison in HSS (M35) tool and CrN tool coating to improve material removal rate in the drilling of AA3003-H14 plates as base material during the CNC drilling operation. In this study HSS M35 and CrN coated twist drill bits are used. Aluminum Alloy 3003-H14 is the specimen in which drilling operation is done. This study includes two groups of 20 specimens each in which drilling operation is done with both the tools. Spindle speed, feed and depth of cut were input factors as 2200, 200 and 10 respectively. On comparing the Material removal rate of AA3003-H14 after drilling done by HSS (M35) and CrN at speed and feed of 2200 and 200 is 165 and 190 respectively. Roundness error with HSS M35 and CrN twist drill tool were 0.0110 and 0.0074 respectively. The results were calculated and analyzed by SPSS software. The significance value obtained for both experimental and control groups was 0.006 (p < 0.05) for material removal rate and 0.019 (p < 0.05) for roundness error. Within the limits of this study, Material removal rate values are observed high in the CrN coated tool compared with the HSS M35 tool for the same input speed, feed and depth of cut without compromising the roundness quality.