Loop position controlling method

Abstract

Abstract PURPOSE:To reduce influence on the shape of coiling remarkably by controlling loop position by adjusting rotation speed of rolling mills in the downstream side within specified acceleration and deceleration rate basing on a position deviation signal of a loop in the uppermost stream side. CONSTITUTION:In a rolling method in which rolled material 1 of bar rod material came out from a roughing mill 11 is passed through intermediate rolling mills 21-24 and a finishing mill 25 successively, and after rolling almost without tension forming loops 31-35 between stands of each rolling mill, coiled on a coiler 26, positions of loops 31-35 are detected by position detectors 41-45 and deviation from set position is determined. Position of the loop 31 in the uppermost stream side is controlled by adjusting rotation speed of downstream rolling mills 21-25 within specified acceleration and deceleration rate basing on the positional deviation through a loop controller 61 and an acceleration/deceleration controller 62. Position of other loops 32-35 is controlled by adjusting rotation speed of upstream rolling mills 21-24 through loop controllers 52-55 basing on the positional deviation. Thus, coefficient of variation of the finishing mill is made small and influence on the coiler 26 is reduced.

Inventors

• 👤 Hiroshi Kobori
• 👤 浩 小堀

Bibliographic Details