| 摘要 |
PURPOSE:To improve the yield of product and the productivity by arranging roll for surface shaping, pressing a slab under high temp. condition and smoothening the slab surface. CONSTITUTION:One pair of surface shaping rolls R, R are arranged as inserting slab 6 passage just at below part of water cooling mold 3 in an electron beam melting device body 1. Further, a temp. detector 11 is arranged just above the rolls R, R and the surface temp. of slab 6 is inputted to a computing element 12 and the deforming resistance of slab surface is found, to control the pressing force of rolls R, R. The high temp. slab 6 drawn down is passed through between the rolls R, R for shaping and the ruggedness of surface is crushed by the pressing force to smoothen. In succeeding process, at the time of hot-rolling the slab 6, defect or crack on the product surface is prevented. Therefore, the yield of product is improved and the productivity is improved.
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