Straightening method of warped steel plate

Abstract

The invention discloses a straightening method of a head turning steel plate. The method comprises the following steps: when a high temperature meter detects that the steel plate is discharged from a finish mill, a turning head steel plate straightening mode is selected, the reverse correction is synchronously selected, and the state enters a semi-automatic mode; a set value of a model computer is requested, and the operation is performed by adding a head turning height according to the set value after receiving the set value; when a first grating is activated, the straightening sequence is started; when first and second gratings are activated, a position tracking and high pressure mode is started, and the steel is bitten with a speed of not higher than 0.7 m / s; when first, second and third gratings are activated, the steel plate enters a straightening machine, a steel plate stop button is pressed down to stop the steel plate, the high-pressure return is performed, and a roller gap is descended to the set position of the model computer; and when the position of the roller gap arrives at the set value of the model computer, the reverse correction is selected, and the forward straightening is performed to finish the straightening sequence. The method can set the roller gap according to the height of the steel plate turning head to guarantee normal steel biting and straightening effects.

Description

technical field [0001] The invention relates to a method for straightening a steel plate in a steel plate rolling process. Background technique [0002] The production process of pipeline steel includes the accelerated cooling (ACC) process. When the steel plate reaches the hot straightening machine after rolling and accelerated cooling in the finishing mill, the head warping is very serious and common. In order to improve the quality of the plate shape, a 7-roller pre-leveler (PPL) is usually added in the thick plate section, arranged between the finishing mill (FM) and the accelerated cooling device, with a symmetrical design. The pre-leveler has dynamic rolls Gap adjustment, roll bending, overall tilting, entrance and exit roll adjustment, and pressurization can eliminate various possible plate shape defects to the greatest extent. The existing pre-leveling machine is equipped with a warping head detector after the finishing mill, including 4 gratings (BLS1~BLS4), which ...

AI Technical Summary

Problems solved by technology

[0007] If the steel plate is relatively thick, such as a steel plate greater than 30mm, if the head is too high, the steel plate may not bite into the pre-leveler.

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