EFFECT OF TOOL NOSE RADIUS AND CUTTING PARAMETERS ON TOOL LIFE, SURFACE ROUGHNESS IN TURNING OF GREY CAST IRON

摘要

In metal cutting industries peoples are trying to reduce the cost of the production by proper selection of inserts, tool geometry, and cutting conditions to obtain economical benefits. Tool nose radius has significant influence on tool life and surface finish. The aim of this research is to investigate the effect of tool nose radius under different cutting conditions and their effect on tool life, surface roughness. The measurement has been carried out by rough boring operation using grey cast iron cylinder liners at three cutting speed (Vc) and feed rate (f). Depth of cut (doc) is kept constant at 2.5mm.Cutting tool used in this work is multilayer coated tool of nose radius 0.8mm and 1.2mm nose radius. Tool coated with titanium nitride (TiN) + titanium carbo nitride (TiCN) +Aluminium oxide (Al2O3) coating. The insert is designated with SNMG 120408. Cutting conditions used is speed (Vc) 100m/min, 125m/min and 150m/min. Feed rate (f) 0.20mm/rev,0.23mm/rev,0.27mm/rev.Finally results of the present work determine the appropriate parameter for increasing the tool life and surface finish for two different nose radius tools.