Method for Eliminating Static Bending and Transverse Folding of Tension Leveler in Cold Rolling Recoiling Unit

Abstract

Disclosed is a method for eliminating static bending transverse folding crease of a tension leveler by a cold-rolling rewinding machine set. The method comprises the following steps that when a machine set line reaches the speed point A in the parking process from normal running speed to a speeding reducing parking process, each lower roller series of the tension leveler is maintained to be at a normal inputting state of belt steel, within the short time t before speed reducing is about to stop, each roller series is dropt by the certain distance d within the short time, each roller series is controlled to be fine-tuned and lifted by turbine worms, when temporary parking operation is completed, when the machine set starts to run again, the four sets of turbine worms simultaneously complete the original-set input amount of rising of each roller series within the short time t2, the length of the belt steel which is not withdrawn and straightened is h2, so the sum of the belt steel which is not withdrawn and straightened is h1+h2, the loss of the withdrawing and straightening wave quality is minimized. The method has the advantages that under the small input amount of roller series, static bending deformation generated in the belt steel is correspondingly reduced, so that the fine tuning input amount of roller series is controlled to reduce static bending deformation of the belt steel, and the purposes that transverse folding crease is eliminated and wave risk is reduced are achieved.

Description

technical field [0001] The invention relates to the field of iron and steel rolling production, in particular to a method for eliminating static bending and transverse folding of a tension leveler in a cold rolling and recoiling unit. Background technique [0002] At present, during the normal production of the heavy coil tensioning and leveling unit of the cold rolling mill, it will be temporarily stopped due to processes such as strip welding and small coil loading. Strip contacts. After the car is lifted, there will be a section of strip steel that has not been stretched and straightened, and there is a risk of wave shape. If the lower roller system of the tension leveler is not lowered, the strip steel in the process section of the tension leveler will produce static bending and plastic deformation due to bending and stretching under the action of the tension and the roll system, and the elongation rate will not reach the set value after the start of the machine. Conti...

AI Technical Summary

Problems solved by technology

If the lower roller system of the tension leveler is not lowered, the strip steel in the process section of the tension leveler will produce static bending and plastic deformation due to bending and stretching under the action of the tension and the roll system, and the elongation rate will not reach the set value after the start of the machine. Continuous tension leveling cannot be obtained, and the strip surface will leave obvious horizontal folds after leaving the tension leveler, which will affect the surface quality of cold-rolled coils, fail to meet customer requirements, and even cause serious quality problems such as bending cracks. loss

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