The research works showed that fine grain structures were obtained by rapid beating treatment of the material in which much strain has kept accumulated. In order to apply this concept to the industrial aluminum production, rapid heating technology for coils was developed. The "Super Metal Technology" project installed the experimental rapid heating apparatus by vertical flux type induction heating method (VFX). This apparatus can heat the aluminum alloy coils of lmm in maximum thickness and 200mm in width at heating rate of about 150 deg C/s. When an aluminum coil was heat-treated in the apparatus, the temperature distribution in width was kept within about 10 deg C. In order to keep uniform temperature distribution of the coil, EPC (Edge Position Control) and CPC (Center Position Control) devices were added to this apparatus. Therefore the usage of those devices, the winding shapes of coils were good enough. For example, winding draft was around 0.5mm when the coil of 0.285mm in thickness, 200mm in width at line speed of 0.12m/s (=7m/min).
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