Method for overcoming camber defect in hot rolling process of steel plate

Abstract

The invention discloses a method for overcoming a camber defect in the hot rolling process of a steel plate, which relates to a method for processing a rolled piece and is used for solving the problems that the defect is not controlled basically and the equipment is required to be optimized in the prior art. In the method, rolling schedules are designed respectively in a forming rolling process, a widening rolling process and a fine rolling process specific to different characteristics of three phases of the hot rolling process of the steel plate on the basis of a stably-rolled working roll flexure condition, the stably-rolled working roll flexure is taken as a constraint condition, the centering of a working roll flexure reinforcing rolled piece is enhanced, and the problem of deviation of the rolling central line of the rolled piece is reduced and even eliminated, so that the aim of overcoming the camber defect is fulfilled, the plate shape of a product is considered simultaneously, and a hot-rolled steel plate of which the size and shape meet practical requirements are finally obtained. Due to the adoption of the method, the conventional mode of adjusting working roll inclination or optimizing the equipment structure based on defect detection is changed, the camber defect is controlled radically, and equipment refitting is not required.

Description

technical field [0001] The invention relates to a method for processing a rolled piece, in particular to a method for eliminating camber defects during hot rolling. Background technique [0002] Camber defect is a common problem in hot rolling production. It not only reduces the yield due to increased shear loss, but also affects the efficiency of the subsequent shearing process. In severe cases, it may even cause side guide plate and machine frame damage due to stacked steel. For the four-high reversible rolling mill, the reasons for the formation mainly exist in the following aspects: the reason of the rolling mill, such as the difference in stiffness on both sides of the rolling mill; the reason of the billet, such as the wedge shape of the original billet, and the temperature difference in the width direction; the reason of the side guide plate, such as Misalignment of side guides, etc. In essence, it is the initial deviation of the compression deformation on both sides...

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Problems solved by technology

[0008] Patent CN101224471 has invented a method for controlling the sickle curve of the rough rolling intermediate billet. It adopts the combination of position control and pressure control to control the opening degree of the side guide plate, and restrains the bending deformation of the intermediate billet at the entrance and exit of the rough rolling mill in the horizontal direction. Realize the reduction of the camber of the middle billet, and at the same time prevent the serious wear caused by the long-term contact between the side guide plate and the middle billet; the patent CN101259482 provides a rolling process for rolling 6mm steel plates in a medium and thick plate rolling mill, and a medium and thick plate rolling mill for rolling 6mm The rolling process of the steel plate is characterized in that the temperature of the billet, the thickness of the billet, the rolling pass, the AGC, the rolling force, the self-adaptive coefficient of the rolling force between passes, the relative crown, the linear speed of the conveying roller table and the rolling mill The line speed matching of the working rolls is set accordingly, which solves many problems such as waves, drifts, cambers, scraping frames, and rolling scraps that often occur in the test rolling of 6mm plates in existing medium and heavy plate mills; patent CN200939463 Disclosed is a magnetic lift rolling mill, which adopts the repulsive force of a strong magnetic field generated by a pair of shielded electromagnets to uniformly press down on the upper and lower support rolls and the upper and lower work rolls, so that the overall force on the work roll body is balanced, thereby It can effectively solve the problem of uneven stress and deformation of the roll body during the steel rolling process that exists in the way of pressing down on both ends of the roll body, resulting in camber, side wave, middle wave, floating shape, offset and fracture during the rolling process. The problem of bad phenomena such as strips; patent US2029751A proposes a rolling mill structure that eliminates camber through a reel-type tensioning device; patent US6318141B1 proposes a roll leveler for metal strip straightening

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