Journal Press India^®

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The research aims to investigate the effects of overhanging of tool, cutting speed and feed rate on surface roughness of EN8 material while producing hexagon of SW17 on CNC Turning machine with C-axis. The cutting tool used in this research is HSS parallel shank 4 flute end mill. Taguchi based design of experiments are applied to develop an L9 orthogonal array for experimental runs. Results are recorded and analysed by using Taguchi S/N ratios with the consideration of performance characteristic of smaller the better as surface roughness values are required to be low. From the study of response table for S/N ratios, it can be concluded that cutting speed had a major effect on surface roughness followed by overhanging of tool and feed rate. The optimum values obtained are Overhanging of tool of 39.6 mm (55%), Cutting speed of 20 m/min, Feed rate of 65 mm/min. ANOVA methodology is used in this research to check the dependency of the surface roughness upon the corresponding input parameters. The results obtained clearly signified that feed rate is most significant followed by overhanging of tool and cutting speed and thus affects the average surface roughness.

Keywords

CNC turning, end-mill, C-axis, surface roughness, polygon, machining parameters

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