Abstract

Abstract This paper shows the wear mechanism of CVD diamond inserts in machining high silicon aluminum alloys. The tool life of a coated insert with a thin diamond layer is very short due to the easy peeling of the diamond layer. Tool wear of an insert coated with a thick diamond layer is promoted in two steps. In the first step, tool wear occurs continuously by diamond grains chipping and falling off the flank face. In the second step, deep cracks are propagated and reach the surface of the substrate at the threshold of the diamond thickness, remaining due to continuous tool wear, and the diamond layer unexpectedly peels off from the substrate. The flank wear determines the tool life in the machining high silicon aluminum alloys. An improvement in the diamond layer resulting in high resistance to chipping and cracking is required in order to increase the tool life for machining high silicon aluminum alloys.

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