A kind of raw material plate start-up method of cold tandem rolling mill

Abstract

The invention discloses a raw material plate starting method of a cold rolling mill. When a first starting signal related to starting in a raw material plate starting mode is received, the roll bending force of each rack in a rack group is loaded to a roll bending force set value, and the compacting and rolling force of the cold rolling mill is loaded to a rolling force set value; when a second starting signal is received after the first starting signal, the real time rolling mill speed of the cold rolling mill is increased at a constant speed to a first set speed value; when that the real time rolling mill speed reaches a preset critical speed value is detected, whether tensions between the racks are stable or not is judged, and whether strip steel thickness deviations are stable or not is judged; and when the tensions between the racks and the strip steel thickness deviations are all stable, the rolling mill speed of the cold rolling mill is increased to a second set speed value from the first set speed value. The raw material plate starting method provided by the invention solves the problem of starting difficulty caused when all racks are started at the same time, further the loss due to waste products is reduced, and the yield is effectively improved.

Description

technical field [0001] The invention relates to the technical field of cold tandem rolling mills, in particular to a method for starting a raw material plate of a cold tandem rolling mill. Background technique [0002] The strip threading start-up rolling process of the raw material plate is an important link in the production and operation of the continuous wide-band cold rolling mill. After the planned maintenance, strip breakage of the rolling mill, replacement of back-up rolls and other work processes, it is necessary to start the strip threading to restore the normal rolling of the rolling mill. The start-up rolling process of the raw material plate is the most difficult to control among all unsteady rolling processes, and it is also the stage where various factors and parameters change most intensely. [0003] At present, the start-up method of the second cold acid rolling raw material plate has been using the stand-by-frame start-up method. The transition from the ra...

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present invention solves the technical problems of excessive thickness and long length due to multiple starts and stops of rolling mills starting and stopping one by one by providing a raw material plate start-up method for tandem cold rolling mills

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