A Dynamic Calculation Method of Cold Rolling Mill Stiffness

Abstract

The invention discloses a dynamic calculation method of cold-rolling mill rigidity and relates to a measuring method that is specially applied to a metal rolling mill, in particular to the dynamic calculation method of cold-rolling mill rigidity for cold-rolling mill thickness control. The dynamic calculation method of cold-rolling mill rigidity includes the following steps that according to width of to-be-rolled strip steel, contact length of middle rollers and working rollers is calculated; the rolling mill rigidity is determined according to the contact length of the rollers; displacement amount of the middle rollers is divided to form a plurality of positions, and the middle rollers are sequentially displaced to all positions to perform testing and collect rolling force and roller gap data of each position; parameters for calculation of rolling mill rigidity are measured according to the collected data and applied to dynamic calculation of rolling mill rigidity according to material specifications, support for improvement of thickness control accuracy of strip steel products can be provided, and requirements of a user for improving product qualities can be met. The dynamic calculation method of cold-rolling mill rigidity can be applied to unit test stage of a newly produced rolling mill device so as to improve capacity of rapidly positioning the device and can also be used for dynamic calculation of rolling mill rigidity during large-scale production to improve control accuracy of the rolling mill.

Description

technical field [0001] The invention relates to a measurement method specially suitable for metal rolling mills, in particular to a dynamic calculation method for cold rolling mill stiffness used for thickness control of cold rolling mills. Background technique [0002] The thickness control of cold rolling mill is the most critical control technology in steel rolling production. Its characteristic is that the thickness of each stand calculated according to the mathematical model is used for the control target, and the thickness control is realized through AGC control technology. The longitudinal stiffness of the frame must be used in the mathematical model for calculating the thickness. According to the classic rolling theory, the ratio of the rolling force to the stiffness of the frame is the roll gap of the frame. The calculation method is as follows: [0003] S = P K - - - ...

AI Technical Summary

Problems solved by technology

However, for newly built or modified rolling mills, due to changes in equipment and lack of actual data, it is impossible to directly obtain the stiffness of the rolling mill by using the above-mentioned prior art solutions

Although the situation of the equipment can be known from the manufacturer, it is far from enough for a unit that precisely controls product production, so effective means must be used to determine accurate calculation parameters

[0009] On the other hand, in order to improve the shape of the plate, the new rolling mills widely used at present generally adopt the technology of rolling rolls in series. The stiffness of the actual rolling mill changes with the rolling of the rolls. If the stiffness of the rolling mill is fixed. For strip steel, as the rolling force changes, the calculated roll gap also changes, resulting in poor calculation results. Although the model can be corrected during the rolling process, the capability of the entire thickness control system is improved. less than full play

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