The Effect of Tool Geometry of Hole Towards Tool Life in Hard Material Holes

Abstract

This study studied the characteristics of machining hard material milling by using carbide Endmill tool with variation machining and carried out without using cooling water. The method used in this study was experimental by providing machining variables (rotation = 191 rpm, 398 rpm, 764 rpm and 1,082 rpm; feeding speed (Vf) = 0.1; 0.18 and 0.26 mm / min). After machining, a tool wear is measured using a digital microscope with magnification 1,000 times. The results of Endmill tool wear measurements show that maximum wear at Vf = 0.1 mm / min = 0.42 mm; Vf = 0.18 mm / min = 0.428 mm and Vf = 0.26 mm / min = 0.4325 mm / min, the greater the feeding speed, the fewer the number of holes produced. While the effect on roughness is that the speed of feed is more influential on roughness compared to changes in workpiece rotation and the rake angle. The roughness data obtained ranged from 0.495 μm to 2.095 μm, this means that the surface roughness value is still in the standard area (Ni ÷ N9 = 0.025 ÷ 6.3 µm) or it can be said that the selected machining variable can be used as the machining variable perforating hard material