コールド・クルーシブルのスリット設計が磁場分布,発熱速度に及ぼす効果

抄録

In order to clarify the effects of the design parameters of a cold crucible such as the width and the number of slits on the process variables, experiments and theoretical analyses were conducted. Magnetic field was measured and an aluminium charge was melted in cold crucibles with different slit widths. The two variables of electrical resistance and inductance were introduced into an equivalent circuit model of a cold crucible and their variations caused by the change of the slit width were calculated by use of the data obtained by measuring the input power and the coil voltage. Furthermore, the three dimensional magnetic field around a cold crucible system was calculated by using of the boundary element method. To confirm the accuracy of the circuit model and the numerical analysis, the variations of the electrical resistance computed by both theoretical ways were compared with each other. By use of the three dimensional computer code, the effects of width and number of slits on the heat generation rates in the crucible, the coil and the charge were evaluated.