Effect of decreasing the tool-chip contact length on the machinability of casting aluminum alloys

Abstract

The tool-chip contact length was artificially decreased by decreasing the width of first rake surface of double rake tool to examine its effect on the machinability of aluminum casting alloys. Decreasing the tool-chip contact length has a remarkable effect to improve the finished surface and to reduce the cutting force in machining such alloys as Al-5%Cu and Al-12%Si alloys having long natural tool-chip contact length. It is not so noticeable in maching such alloys as Al-Zn-Mg alloys having short natural tool-chip contact length. The tool wear is also reduced with shortening the tool-chip contact length.