Masatsugu Kamiya

Effect of Cutting Fluids on Machinability of Aged Al-5.6mass%Cu-4.0mass%Si slloys

The effect of the cutting fluids on the machinability of Al-Cu-Si alloys which is candidate of the free cutting aluminum alloys without lead have been studied. The turning test was carried out using the cutting tool with the chip breaker. It was found that surface roughness after machining of the alloys became roughened, while the generation of the adhesion on the cutting tool was increased either in the dry or the wet cutting conditions. In the dry cutting, the chip breaking was better in the over aged alloys where the adhesion was easily generated. On the other hand, the chip breaking in the wet cutting was better in the under aged alloys where the adhesion was hard to generate. These results can be explained in terms of generation of the adhesion on the cutting tools ; in the dry cutting, the chip was greatly bent by the existence of the adhesion on the cutting edge of the cutting tool though, in the wet cutting, the chip breaker acted effectively by the adhesion was not easily generated.