Abstract
Cut-off turning tests were conducted on 3 sorts of alloys now under development based on Al-Zn-Mg system and 4 sorts of experimental alloys which had been prepared with different chemical compositions for the use of pressure die casting.
The principal results obtained were as follows.
(1) There were little differences in cutting resistance and roughness of cut-off surface among the 4 sorts of experimental alloys.
(2) When cutting oil was applied, the experimental alloys showed slightly higher cutting resistance because of their higher hardness than that of the alloys now under development. However, the experimental alloys showed higher cutting ratio and it would be believed that they had higher machinability in turning.
(3) In dry cutting, the experimental alloys had much higher machinability than the alloys now under development, except Alcan 432 alloy.
