Abstract
High speed cutting tests were conducted on the metallic mold castings and low pressure castings for the specimens of as cast (F material) and heat-treated (T-6 material) for the purpose of examining the machinability of aluminum casting alloy AC2B. The following results were obtained.
It seemed that these materials showed lower cutting resistance as compared with other aluminium alloys. The resistance of low pressure castings was slightly lower than that of metallic mold castings, and the resistance of T-6 materials was higher than that of F materials in any case. There were no distinct differences in the growth of built-up edge, surface roughness, formation of chips, etc. between the both castings, but some differences between the both materials in any case. For example, built-up edge was clearly recognized on F material, but not T-6 material; trace marks by feeding tool were distinct on the finished surface of T-6 material which was bright, but a very rough and lustreless surface was apt to be shown on F material. In addition, there would be some troubles for treatment of chips on F material. In case of large side rake angle, macrostructure appeared on the finished cutting surface of T-6 treated low pressure castings.
