PURPOSE: To eliminate the need for trimming a width variation part, and to improve product yield, by calculating an optimum width rolling reduction basing on the informations of a slab width, and obtaining the uniform width of the slab at a coil stage after rough rolling by rolling the slab basing on the calculated results.
CONSTITUTION: The width in the longitudinal direction of a slab 1 having width variation produced in the front stage of hot rolling is measured by a width measuring part 2. The width information required for hot rolling is calculated from the measured results, and optimum width rolling reduction is decided by the information basing on the extent of width variation allowable as a product. And the optimum rolling reductions of respective roughing mills 10, 11 are set and instructed basing on the optimum width rolling reduction. Thus the slab 1 is rolled to the allowable width by a vertical scale breaker 9 having a caliber and the mills 10, 11, basing on the instructions.
HONGOU MASANOBU
NISHIMOTO MASANORI
FUKUI NOBUO
| JPS4736619A | ||||
| JPS5090560A | 1975-07-19 | |||
| JPS5484851A | 1979-07-06 |