Method for controlling rigidity of mill housing

Abstract

The invention provides a method for controlling rigidity of a mill housing, which comprises the steps of: initializing a mill roll gap regulating variable, setting a rolling force, and adopting a mechanical pressing roll gap control so that after the roll gap reaches the set position, the roll gap position set by the mechanism pressing keeps unchanged; starting thickness automatic control function, locking the momentary rigidity as reference rigidity, providing real rigidity, set rolling force, mill stand rigidity coefficient, rolled piece plasticity coefficient and roll gap set value by an upper computer; calculating the roll gap regulating variable by a formula; and regulating the roll gap by a hydraulic pressing system according to the roll gap regulating variable delta S' obtained from the calculation to a satisfactory degree and ending the regulation of the position of a mill. The invention realizes the purpose of improving the thickness control precision of rolling a wide and thick plate under the condition that the rigidity of the mill housing changes and can be popularized and applied to the improvement of various pressure AGC models for steel rolling, thereby having better popularization and application prospect.

Description

technical field [0001] The invention belongs to the metallurgical industry, in particular to a method for controlling the rigidity of a rolling mill frame. Background technique [0002] The slab thickness control system occupies a very important position in the whole steel rolling production process, and the quality of the control directly affects the quality and qualification rate of the finished steel plate. [0003] In the SIEMENS model, the rack stiffness set by the host computer is used, and the rolling data recorded in the PDA (Process Data Acquisition, referred to as PDA) is analyzed, and it is found that the rack stiffness used in the model is consistent throughout the rolling process. The process is variable, and its variation range is about 2 to 5%. Through the analysis, the speed of the rolling mill changes during the rolling process. When the speed of the rolling mill increases, the deformation resistance becomes larger, so the set rolling force needs to be incr...

AI Technical Summary

Problems solved by technology

[0006] By searching the technical points to be protected, and consulting non-patent documents such as relevant periodicals, magazines, manuals and books, it is found from the results of the search and the reviewed materials that there is no technology close to the patent to be applied for

Images