Appraisal of the Performance of PVD Coated Carbide Tools during Precision Turning of Ti-6al-4v

摘要

Where on the flank of a cutting tool is caused by friction between newly machined surface and the contact area on the tool, which plays a predominant role in determining tool life. Detailed study on progression and wear mechanism at the cutting edge of PVD coded carbide tools were carried out at cutting speed of 30 - 90 m/min, feed rate of 0.02 - 0.06 mm/rev and depth of cut of 0.05 - 0.15 mm. The pattern of wear progression on the flank face of the coded carbide tools consist of three stages for all the cutting speed tested. Those are; extremely rapid wear at the initial stage, gradually increases at the second stage and rapidly increases at the final stage especially at high depth of cut (0.15mm) and high feed rate (0.06 mm/rev). High feed rate and depth of cut would cause high temperature generated and consequently damaged the cutting edge. While low depth cuts and cutting speed would cause the wear formation near to the nose radius. The proposed work is to carry out machining under the selected levels of parameters to evaluate the cutting force and surface roughness generated as the consequence of the machining process. Cutting speed, feed rate, depth of cut and nose radius are considered as the machining parameters for experimentation. The variation in the surface roughness and the cutting force for the variation of each machining parameters are presented graphically.