Multi-rack working roll shifting method for eliminating local high points of plate strip

Abstract

The invention discloses a multi-rack working roll shifting method for eliminating local high points of a plate strip, which comprises the following steps that: in the rolling process, each rack performs roll shifting periodically in a crossed manner in a certain step length and directions; when rolling begins, the initial roll shifting directions of the adjacent racks are different, and the initial roll shifting directions of the spaced racks are the same; on the basis of the periodic roll shifting position of each rack, a random correction is superposed, so that the adjacent racks shift in opposite directions, and the spaced racks shift the rolls asynchronously, namely, the roll shifting positions of the spaced racks keep a certain difference, so that wear grooves generated by the racks are staggered as much as possible, and the service life of the racks is prolonged. And the heredity of the defective plate profile among multiple racks is weakened to the greatest extent. By the adoption of the multi-rack working roll shifting method, roll abrasion can be improved, the rolling kilometer can be prolonged, local high points on the edge of the plate strip are effectively eliminated, and then the plate shape quality of the finish rolling outlet plate strip is improved.

Description

technical field [0001] The invention relates to the technical fields of metallurgical machinery, automation and hot continuous rolling, in particular to a multi-stand work roll shifting method for eliminating local high points of strips. Background technique [0002] During the hot continuous rolling of strips, the worn shape of the rolls of each stand will be "imprinted" on the strip, and the "cat ears" formed by the uneven wear of the rolls will act on the strip to form local high points, and with the As the number of rolled coils increases, the local high points will become more and more significant. At this time, in order to ensure the quality of the product section profile, the number of production blocks in the rolling unit has to be shortened, and this problem can be solved by replacing the new work rolls, but this will temporarily interrupt production, increase the number of roll changes, and affect the output of the production line. It can be seen that the local hi...

AI Technical Summary

Problems solved by technology

Although this method can keep the wear grooves of adjacent racks staggered, which alleviates the problem of local high points to a certain extent, but because the roll shifting positions of the interval racks are always synchronized, the wear grooves still have genetic effects, so it is still necessary to adjust The roll shifting strategy of the frame is optimized to eliminate the influence of the "cat ear" wear groove of the front frame as much as possible

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