A method for dynamic stiffness control of hot rolling mill finishing mill stand

Abstract

A hot continuous rolling mill finishing mill group rack dynamic stiffness control method includes: (1) performing control on initial threading rack head stiffness; (2) tracking and calculating actual positions of the head of a band steel; (3) performing primary control which is first time variable stiffness control after threading on rack stiffness; (4) controlling actual positions of the band steel; (5) performing constant stiffness control on the band steel; (6) controlling actual positions of the tail of the band steel; (7) performing rack stiffness control which is second time variable stiffness control of the band steel before steel throwing; (8) performing rack initial stiffness control in the steel throwing stage. The hot continuous rolling mill finishing mill group rack dynamic stiffness control method achieves the purpose of improving quality control of a roll surface of a rack mill roll by controlling related dynamic variable stiffness in the rolling process of the rack, in other words by controlling stiffness of a rolling mill twice according to different positions of the band steel.

Description

technical field [0001] The invention belongs to the field of plate shape control in plate and strip rolling, in particular, the invention relates to a dynamic stiffness control method of a finishing rolling unit of a hot continuous rolling mill. Background technique [0002] Regarding the dynamic load control method of the finishing unit of the hot tandem rolling mill, there are related patented technical descriptions. For example, the Chinese patent application with the application number "200610124802.9" and the title of the invention "A Method for Controlling the Crown of Hot-Rolled Strip Based on Smoothly Varying Rolling Rules" discloses a method for controlling the crown of finished hot-strip steel. The method is aimed at the problem that the roll bending system can not control the crown of the strip during the hot rolling process, and provides a method for controlling the crown of the hot-rolled strip based on a smoothly changing rolling schedule. According to the met...

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Problems solved by technology

[0009] Combined with the requirements of roll surface control, once the rolling force is too large in the front stand, it will directly affect the quality control of the roll surface of the roll, especially in some specific cases, with the change of rolling products, once In the rolling process, the rolling force of different stands cannot be controlled according to the variety, which will directly lead to the excessive rolling force of the front stand, which will cause the peeling of the oxide film on the roll surface of the stand, thus affecting the hot rolling. Surface Quality Control of Strip Steel

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