A new automatic gauge control system for a reversing cold mill.

Abstract

SynopsisFundamental study on automatic gauge control (AGC) of reversing cold rolling mill was carried out. The study includes the method of evaluating performance of AGC system and designing a control system according to the results of the study.It was concluded that the response of AGC system depends on the dynamic characteristics of a reel motor current control in either case of controlling reel motor current or roll position. The AGC system controlling the reel motor current is better than the AGC system controlling the roll position even with a hydraulic screwdown system.A new AGC system controlling reel motor current and roll position has been developed based on the above results. This system has been applied to Sendzimir and 4-high reversing mills.

Recent Progress of Rolling Technologies in Japan.

“…34) In a reversing cold mill the AGC system, which controls the roll motor current, is better than the AGC system, which controls the roll position, even when a hydraulic screwdown system is used. 35,36) The characteristics of the titanium shape control used in a 6-hi mill were clarified through the experimental and theoretical investigations and mass production technology was established.37)…”

Advanced Tension Control Based on State Feedback for Reversing Mills

“…If the damping ratio is small, the dynamics becomes oscillatory and hard to control, which can disturbs smooth start up of each pass and can result in rupturing of the strip. Regarding tension control in reversing mills, some approaches toward multivariable control including thickness (Hoshino, et al, 1988;Kondo, et al, 1988) have been proposed, but reports on effective methods for controlling the tension itself cannot be found in the literature. This paper presents a new tension control scheme for reversing mills based on a state feedback approach.…”