Abstract
In order to improve the transverse thickness uniformity of amorphous ribbon by increasing the axial uniformity of cooling roller thermal characteristics during planar flow casting, a novel convex cooling roller was proposed. The flow characteristics, transient temperature, and thermal deformation of the proposed convex roller and existing straight roller were studied using a fluid-solid thermal coupling method based on a full-flow channel calculation model under axial variable boundary. In addition, the reliability of the simulation approach and results are verified by measuring the roller deformation on the spot. The results show that the heat transfer acting on the roller inner wall is unevenly and asymmetrically distributed in the axial direction. The full-flow channel model with coupling method provides high solution accuracy, the error between simulation and the experiment is about 7.5 %. Compare to the existing straight roller, the maximum heat transfer coefficient in the middle width direction increases by 108 %, the axial difference of the temperature and deformation decrease by 15.4 % and 26.9 %, respectively, when the convex roller with bending radius R = 300 mm. The maximum temperature, thermal deformation, and axial difference in the puddle contact zone decrease obviously with the increase of the roller bending radius. These results provide a promising strategy for improving the transverse thickness consistency of the amorphous ribbon.
NSTL
Elsevier