JPS54145350A - Rolling - Google Patents

Abstract

PURPOSE: To make easire rolling operation by lessening impact to roll by making feeding speed slower by detecting material to be rolled before the rolls or making it faster by a roll interlocking detection signal.

CONSTITUTION: The steel ingot 4 is fed in the arrow mark direction 5 by interlocking the rollers 3a and 3b with the main roller 1 by the command of controller. When the steel ingot 4 reaches the position of the detector 7 at the time T_-2, the decelerating relay is operated and the main roll 1 is decelerated at the time T_-1 to lower the speed of steel ingot. And, at the time T₀, the tip 4a of steel ingot is put into the main roll 1, whereupon rolling torque rises up at the time T₀ but with less impact and peak torque smaller than the firm motor max. torque. And, the load shell 9 is operated, the decelerating relay is tamed, the steel ingot 4 is rolled with increased speed from the time T₀ to the time T₁, and odd pass is completed at the time T₀ and stopped at the time T₃ to complete the rolling in the arrow mark direction 5. The same is ture of the arrow mark direction 6. Thus, impact to rolls can be greatly reduced.

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