Optimization method of roll profile based on roll change cycle

Abstract

The invention discloses a roll shape optimization method based on the roll change cycle, which specifically includes: collecting rolling mill equipment parameters, strip process parameters, and roll parameters, calculating the plastic deformation heat generated by the plastic deformation in the rolling deformation zone, rolling The heat generated by frictional work in the control area, the energy absorbed by the roll, the temperature caused by the frictional heat and plastic deformation heat of the roll, the hot roll shape caused by the rising temperature of the roll, and the initial roll shape parameters and the initial value of the objective function G 0 (x), calculate the objective function value, judge |G(x)‑G 0 Whether (x)|≤δ holds true, the optimal roll shape parameters can be obtained. This parameter can be used to calculate the plate shape when considering the hot roll shape through the plate shape model, which is not only conducive to the comprehensive optimization control of the plate shape, so as to produce better quality A good plate shape improves the actual production efficiency and brings better economic benefits to the unit.

Description

technical field [0001] The invention relates to the technical field of cold-rolled strip shape control, in particular to an optimization method based on a roll shape in a roll change cycle. Background technique [0002] In recent years, with the rapid development of industries such as automobile manufacturing, precision instruments and meters, and home appliance packaging, the market and users' demand for product supply has continued to increase. At the same time, the quality of strip steel products has become the core factor of market competitiveness. . [0003] As the most important measure of strip quality, the shape of the strip is mainly affected by the shape of the roll gap. Further analysis shows that the shape of the roll gap is determined by the roll shape of the work roll. The importance is self-evident. For work rolls, a cycle from the beginning of service to the final replacement is called a roll change cycle. After the new roll is replaced on the rolling mill...

AI Technical Summary

Problems solved by technology

After the new roll is replaced on the rolling mill, due to the lower surface temperature of the newly replaced roll, the calorific value of the roll will gradually increase as the rolling process progresses until the surface of the roll reaches a state of thermal equilibrium. This stage is called the initial stage of the roll change cycle. The rolling state is in an unsteady state. Through the analysis of the unsteady stage of the roll change cycle, it can be known that when the roll state is in an unsteady state, the calorific value of the roll is in the process of changing, and the thermal crown of the roll has not yet formed, which will cause the shape of the roll gap The change of the strip shape quality is not good; when the roll surface reaches the thermal equilibrium state, that is, after the roll forms a stable thermal crown, the rolling state is in a steady state until the end of the roll change cycle

[0004] The traditional optimization of roll shape is to consider the shape quality of the rolling stable stage in the roll change cycle, ignoring the poor product quality caused by the influence of the roll shape on the shape of the roll in the unsteady rolling state at the beginning of the roll change cycle, relying on Subsequent finishing units improve the products with poor shape quality to solve the problem of shape defects, and the more serious shape quality can only be closed treatment of the strip, resulting in a decrease in the product yield and bringing more problems to the enterprise. big economic loss

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