直接通電抵抗加熱法を用いた平板形状金型の温度分布有限要素解析

抄録

In the automotive industry, it is necessary to reduce the cost of molding process for an application of CFRTP in car component parts. Recently, a heating method of the mold by using the high frequency direct resistance heating is attracting a great deal of attention. With this method, electric current passes near the mold surface intensively by skin effect and heats the mold by Joule heating. By applying direct resistance heating to the flat mold for CFRTP molding, simplification of the equipment and facilities as well as high-speed molding can be expected. However, the uniform temperature distribution is one of the important issues to be solved for flat plate because of a current concentration at the corners. In this study, in order to apply the direct resistance heating to the flat mold for CFRTP molding, FEM analysis of the electromagnetic field and heat transfer was conducted and analyzed results were compared with the experimental results. Target part of the mold was efficiently heated by positioning the electrodes close to the molding surfaces, and the temperature rise in the corner part was remarkable under the higher frequency. For preventing a current concentration at the corner parts, a new feeding model, in which copper plates were positioned at the both sides of the mold, was proposed.