On the machinability of AC5A

Abstract

In this study, it was examined that the machinability of Al-4Cu-2Ni alloy (AC5A) in turning, Ni content in the alloys was changed to three varieties within the limits of JIS (Al-1.7% to 2.3%Ni). To avoid the effects by the contents of Si and Fe in the work materials on the machinability, they were kept 0.06%Si and 0.14%Fe. Result obtained are as follows:
Cutting force was not changed by difference of Ni content in the alloys which were used in this tests and its grade was similar to the case of 7075-T6 cutting. Moreover the various tool materials made no great difference in the cutting. In the low-speed and lowfeed cutting, cutting temperature was in the range of 450K to 500K, in the high speed cutting, however, the temperature approximately 700K regardless of the feed. It was found that the differences of tool wear aspects depend on various tool materials, namely the tool wears of SKH4 and SKH57 were relatively small, and K10 tool wear was still smaller. Also, in the low-speed cutting, built-up edge grew actively and cut surfaces were inferior, but in the high-speed cutting, the built-up edge disappeared and the cut surfaces became satisfactory. In general, chip disposal was found rather easy.