Method for compensating residual pressing force in process of rolling six-roller mill extremely thin strip

Abstract

The invention discloses a method for compensating residual pressing force in the process of rolling a six-roller mill extremely thin strip. The method comprises the first step of collecting main devices and technological parameters of a unit and the standard characteristics and technological parameters of extremely thin strip steel, the second step of defining process variables involved in the parameter optimizing process, the third step of endowing related process parameters with original values, the fourth step of solving optimum rolling technology parameters, the fifth step of solving optimum roll system parameters, and the sixth step of outputting optimum parameters, wherein the steps are executed through a computer. By means of the method, the outlet strip shape is improved to the maximum extent, the pressing force at the roller end is controlled within an allowed range, and the situation that pressure among rollers is distributed unevenly because of shuttling of a middle roller is improved.

Description

technical field [0001] The invention relates to the field of metallurgical cold rolling, in particular to a method for compensating residual pressure during ultra-thin strip rolling by a six-high rolling mill. Background technique [0002] The so-called pressing refers to the phenomenon that the work rolls contact each other and flatten outside the width of the strip during the rolling process of the extremely thin strip. According to on-site production experience, for a six-high rolling mill, the thinner the strip to be rolled, the more obvious the roll-end pressing phenomenon of the work rolls will be, resulting in an abnormal increase in the rolling pressure, and the shape and thickness accuracy cannot meet the requirements , affecting the quality of the finished strip (ref. [1,2] ). In the rolling process of ultra-thin strip steel, when the thickness of the entrance and exit is constant, there are three main factors affecting the pressure of the roll end and the shape ...

AI Technical Summary

Problems solved by technology

The parameters of the roll shape are not adjustable during the production process. In this way, when the reduction rate is fixed, the shape of the exit plate and the pressure of the roll end are only related to the set value of the entrance and exit tension, the set value of the rolling pressure, and the working pressure. The roll is related to the bending force of the intermediate roll and the movement of the intermediate roll. If the relevant variables are not set properly, it is likely to cause the roll end pressing width to exceed the allowable pressing width, and the rolling pressure will increase abnormally, thus affecting the rolling mill. And the elastic deformation of the roll system, resulting in the out-of-tolerance of the exit plate shape and exit thickness, which directly affects the exit quality of the strip

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