分子軌道法を用いたマグネシウム切削加工新生面の特性推定法

抄録

This paper describes the presumption method of the characteristics of the magnesium fresh surface in metal removal process that uses electronic states analysis by molecular orbital method. Recently, the demand of magnesium alloy has increased in connection with lightweight-sizing of home electronics. Under the cutting process of magnesium alloy, its activated fresh surface reacts with moisture in air. Therefore explosion accidents have occurred because of hydrogen generated in the cutting process. In order to perceive the risk of the magnesium fresh surface, we calculate the electronic states density of the fresh surface and the molecule existing in the environments close to the surface, and presume the characteristics of the fresh surface briefly. As a result, we find the useful index, moment of electronic states spectrum, to estimate the magnesium fresh surface characteristics, for instance, with the molecule of tool materials, air and water easily. Then the validity of the index is shown by comparison of experiment results, in which a cermet tool is suitable for magnesium cutting and the energy of the fresh surface becomes high in case of the cutting with segmental type chip or in the air.