THE ADDITION OF ALUMINIUM AND MAGNESIUM TO GRAY CAST IRON AS A METHOD OF REDUCING CERMET TOOL WEAR IN HIGH SPEED CUTTING

摘要

This study aims to investigate the effect of gray cast iron with nonmetallic inclusions on the tool wear of cermet tools in high-speed cutting. In this research, small quantities of Al and Mg were added to gray cast iron without influencing its mechanical characteristics and castability. When turning the gray cast iron containing Al and Mg at high speed, a protective layer consisting of nonmetallic inclusions of work materials, and traces of Al and Mg built up on the tool flank face and rake face. Furthermore, flank and crater wear was significantly reduced when compared to that resulting from cutting of conventional gray cast iron. This reduction in flank and crater wear was particularly noticeable at a cutting speed of 700m/min.