抄録
Concerning the three kinds of conventionally used die-casting alloys (Mg-, Al- and Zn alloys), we have studied (a) the relation between the temperature of specimens that are ejected from the die and the shot numbers, and (b) the tensile properties and the impact value of specimen at room- and high temperature, with due reference to the shot numbers. By these investigations, the following distinctive features of Mg alloys were found in comparison with those of the other two alloys: (1) The temperature of dies has a strong influence on that of Mg-alloy castings. (2) The mechanical properties of Mg-alloy castings are inferior to those of Al- and Zn alloys. (3) The deformation of castings caused by the ejector pin is mildest in Mg alloys, judging from the strength of castings at high temperature and the casting temperature. (4) It was also ascertained that the heat-loss of the dies varies proportionally to the temperature of the dies.
