Variable-stroke and variable-step-size roll motion alternating method

Abstract

The invention provides a variable-stroke and variable-step-size roll motion alternating method. The method comprises the steps that the roll motion alternating stroke transformation proportion q is obtained; the alternating cycle number i is obtained; according to the alternating cycle number i and the roll motion alternating stroke transformation proportion q, the (i+1)th roll motion alternating stroke W(i+1) is obtained, wherein W(i+1) is equal to q*Wi, wherein Wi is the roll motion alternating stroke when the cycle number is i; the roll motion alternating step size transformation proportion p is obtained; the reverse alternating number j of a working roller is obtained; according to the reverse alternating number j and the roll motion alternating step size transformation proportion p, the (j+1)th roll motion alternating step size S(j+1) is obtained, wherein S(j+1) is equal to p*Sj, and Sj is the roll motion alternating step size when the reverse alternating number is j. According to the variable-stroke and variable-step-size roll motion alternating method, the abrasion uniformity of a roller can be significantly improved, the strip steel shape quality is improved, and the planned order length is increased.

Description

technical field [0001] The invention relates to the technical field of roll shifting control of a hot continuous rolling finishing mill, in particular to a roll shifting method with variable stroke and variable step length. Background technique [0002] The change of the roll shape caused by wear and thermal expansion of the surface of the work roll leads to the fluctuation of the shape of the roll gap, especially the uneven wear of the surface of the work roll will cause the distortion of the load-bearing roll gap. If the surface of the work roll is in contact with the strip with constant width for a long time, sharp "cat ears" will be formed on both sides of the bottom of the wear groove due to local wear, and the "cat ears" will be imprinted on the strip under the action of rolling force It will cause strip shape defects. [0003] With the conventional roll shifting function of equal stroke and equal step length, there is uneven wear of the rolls during the rolling proce...

AI Technical Summary

Problems solved by technology

[0004] The embodiment of the present application provides a roll shifting method with variable stroke and step length to solve the problem of strip shape defects caused by local wear of work rolls in conventional roll shifting methods with equal stroke and step length.

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