Considerations on the tool wear in machining AC5A by means of EPMA

Abstract

Some considerations of tool wear in AC5A-T6 cutting are presented. The tool wear was examinend mainly by EPMA being compared with the case of 7075-T6 cutting. In this tests, four kinds of high speed steel tool, i. e. SKH4, SKH51, SKH55 and SKH57 tools and also a carbide tool K 10 were used. The results can be summarized as follows:
The tool wear in AC5A cutting was relatively smaller than the case of 7075-T6 cutting, but in general, a fairly large tool wear was found when high speed steel tools were used. The each tool wear of SKH51, SKH55 and SKH4 tool was relatively large, but SKH57 tool wear was relatively small. Especially K 10 tool wear was very small. In AC5A cutting, it seems that the tool wear is affected not only by abrasive wear by hard particles such as NiAl₃ and CuAl₂ etc. which are expected to exist in the AC5A structure, but also by adhesive wear. The adhesive wear is produced because of the chemical affinity which the elements, that are aluminum, copper, nickel and magnesium in the work material, have with the tool material.