JPS5614018A - Controlling method for speed of hot rolling mill - Google Patents

Abstract

PURPOSE: To carry out the rolling work while controlling as small as possible the generation of impactive large mechanical torque likely to cause the breakage of the motor, by measuring the distance between the preceding material and the trailing material, and by lowering the speed of the rolling mill driving motor according to the magnitude of this measured distance.

CONSTITUTION: When the trailing material 2 comes to the middle point between the front table 6 and the feed side feed roller 4, while the preceding material 1 is undergoing the rolling work, the distance g₂ between the preceding material 1 and the trailing material 2 is measured by the photoelectric detector, etc., and the timing of biting of the trailing material 2 is theoretically predicted. Then, according to the magnitude of this distance g₂, the speed of the rolling mill driving motor M is lowered before and just after the pass-out of the preceding material 1 (this is the end point of the present rolling pass). In other words, the timing and the amount of the speed down of the motor M are automatically altered according to the value g₂. As a result, the large mechanical torque to be impressed on the motor M is reduced, and the motor M is prevented from the breakage.

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