| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a hot rolling apparatus and a hot rolling method by which a metallic material to be rolled can be reduced to a maximum extent according to the thickness of the metallic material to be rolled even when hot-rolling the unrolled metallic material to be rolled, and thus, the number of times of hot rolling treatments needed by the time the metallic material to be rolled is hot-rolled to a desired thickness can be reduced, and production efficiency of metallic products using metallic materials after hot rolling can be improved. <P>SOLUTION: The hot-rolling apparatus 1 includes a reversible rotary rolling mill 2 for hot-rolling a slab 15b which is one example of the metallic material to be rolled and a control section 7. The control section 7 controls the reversible rotary rolling mill 2 so as to hot-roll the portion other than the nose part of the slab 15b by screwing down a rolling roll 3a to the maximum rolling reduction that is set in accordance with the thickness d2 of the slab 15b before rolling at the regular rolling treatment of a first pass. Moreover, the control section 7 controls the reversible rotary rolling mill 2 so as to hot-roll at least the nose part which is left unrolled at the reverse rolling process of a second pass. <P>COPYRIGHT: (C)2013,JPO&INPIT |
