A secondary rolling method for broken coils in a single-stand reversing cold rolling mill

Abstract

The invention discloses a secondary rolling method of a broken belt roll of a single-rack reversible cold rolling mill. The broken belt roll with the outer diameter not smaller than 1,000 mm is transported to an uncoiler to be rolled again, wherein the broken belt roll is not rolled to the target thickness. By means of belt penetrating through cooperation of automatic deviation correcting of an uncoiler CPC and manual aligning, starting with the small roll gap inclination value and the low speed, small outlet tension difference, the first-pass drift manual shutdown and other technical measures, the direct judgment amending on the broken belt roll is avoided, wherein the broken belt roll is not rolled to the target thickness. The problem that an original broken belt roll is prone to be broken again in the first pass of secondary rolling is solved, the roll energy consumption is reduced, the output per hour of a unit is increased, and economic benefits of a steel enterprise are obviously increased. The yield of unit products of the thin specification is increased, and the just-in-time delivery of orders is forcefully guaranteed; and accordingly the production efficiency is obviously improved, the production cost is reduced, and the economic benefits of the steel enterprise are increased.

Description

technical field [0001] The invention relates to the technical field of steel rolling, in particular to a secondary rolling method for broken coils of a single-stand reversing cold rolling mill. Background technique [0002] At present, almost all steel enterprises equipped with six-high single-stand reversing cold rolling mills are producing cold-rolled thin strip coils with a thickness of 0.8mm or less. When producing the above-mentioned thin-gauge products, accidents of strip breakage are prone to occur due to reasons such as operational errors, excessive rolling force, unavoidable raw material defects, and unstable rolling conditions. For the broken coils that have not been rolled to the target thickness, some steel companies will directly change the judgment, but the broken coils have not yet been rolled to the target thickness. A series of manpower and material resource losses affect the timely delivery of orders; some steel companies will also transport the broken coi...

AI Technical Summary

Problems solved by technology

In the production of the above-mentioned thin-gauge products, due to operational errors, excessive rolling force, unavoidable raw material defects, and unstable rolling conditions, accidents of strip breakage are prone to occur

For the broken coils that have not been rolled to the target thickness, some steel companies will directly change the judgment, but the broken coils have not yet been rolled to the target thickness. A series of manpower and material resource losses affect the timely delivery of orders; some steel companies will also transport the broken coils to the uncoiler for secondary rolling. The back tension provided by the coiler is small during the rolling process, and the surface roughness and wedge shape of the broken strip coil in the second rolling are quite different from the hot-rolled pickled slab in the first rolling, which leads to the current secondary rolling The rolling condition of the first pass in the manufacturing process is very unstable, which can easily cause secondary strip breakage, increase the consumption of rolls, reduce the machine-hour output of the unit, and significantly reduce the economic benefits of steel enterprises

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