Process method for controlling thermal crown of working roll of front rack of secondary cold rolling unit

Abstract

The invention provides a process method for controlling the thermal crown of a working roll of a front rack of a secondary cold rolling unit, and belongs to the field of metal rolling. The process method comprises the following steps of: firstly, establishing a working roll temperature field model; calculating the roll body temperature distribution of the working roll at the rolling time ti; establishing a working roll thermal deformation model, inputting the roll body temperature and the distribution condition of the working roll at the ti, and calculating the thermal crown of the working roll; and providing a process setting basis for the compensation of the roll gap control precision of the working roll of the front rack of the secondary cold rolling unit by combining the size or change rule of the thermal crown of the working roll. In a plate shape regulation and control technology, the dynamic compensation of the roll gap precision is given according to the size or change rule of the thermal crown of the working roll and the plate shape regulation and control technology so as to eliminate the influence of the roll gap precision on the plate shape, and the dynamic compensation of the roll gap precision is carried out by optimizing the axial flow distribution of cooling liquid along the working roll and / or using a roll bending regulation and control technology so as to eliminate the influence on the plate shape. The process method can be widely applied to the field of process control of the front rack of the secondary cold rolling unit.

Description

technical field [0001] The invention belongs to the field of metal rolling, in particular to a method for controlling the thermal crown of work rolls in the front stand of a secondary cold rolling unit. Background technique [0002] The front stand of the two-stand six-high UCM secondary cold rolling unit is responsible for rolling, and the last stand is responsible for leveling. It mainly produces ultra-thin DR material products, and the thinnest product can reach 0.1mm. [0003] The work rolls (also known as rolls) of the front frame (customarily called 1# frame) of this type of secondary cold rolling unit have two types of roll diameters, which are small roll diameter work rolls (φ300-φ340mm, referred to as small rolls) ) and large roll diameter work rolls (φ410-φ460mm, referred to as large rolls). [0004] The production characteristics of this unit are different from those of the cold tandem rolling unit. The rolling process is discontinuous, and the intermittent perio...

AI Technical Summary

Problems solved by technology

[0004] The production characteristics of this unit are different from those of the cold tandem rolling unit. The rolling process is discontinuous, and the interval between rolling each strip is longer, resulting in thermal instability in the rolling area and unstable thermal crown of the rolls, especially in new rolls. During a period of rolling transition after starting the machine and during the period when each coil of strip starts rolling

[0005] The thermal crown instability of the work rolls is especially sensitive to the influence of the shape of the thin material, and the thermal instability of rolling will lead to the instability of lubrication, which directly affects the shape quality of the finished strip

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