Width Control Method for Longitudinal and Transversal Rolling of Medium and Heavy Plate

Abstract

The invention discloses a method for controlling transverse rolling width and longitudinal rolling width of a moderately-thick plate, and relates to the technical field of pressure processing of metals. The method comprises the following steps: A, setting rolling procedures, wherein the rolling reduction of all passes before the last pass in the transverse rolling stage is set according to the maximum allowable load which can be borne by a rolling machine; B, shooting a shape image of the side surface of a rolling part in front of an inlet of the last pass so as to obtain the ratio of the effective width of the middle part of the rolling part in the image to the thickness of the rolling part in the image, and synchronously measuring the actual thickness of the rolling part at the moment to obtain the width deviation; C, calculating the compensation rolling reduction of the last pass of the rolling part according to the width deviation, summing the compensation rolling reduction and the set rolling reduction of the last pass to obtain the compensated rolling reduction of the last pass, and then adjusting the roll gap value of the last pass or the last two passes according to the compensated rolling reduction, so as to obtain the expected effective width of the middle part of the finished product of the rolling part. Compared with the prior art, the method has the advantage that the width accuracy of the moderately-thick plate in the transverse rolling stage can be effectively improved.

Description

technical field

[0001] The invention relates to the technical field of metal pressure processing, in particular to a method for controlling the rolling width of a medium-thick plate in a rolling mode of horizontal and vertical rolling. Background technique

[0002] In the production process of medium and thick plates, due to the limitation of the width of the ingot, it is often necessary to adopt the method of horizontal and vertical rolling, that is, the whole rolling process is divided into the horizontal rolling stage and the longitudinal rolling stage, and the plate is rolled to the desired width through horizontal rolling , and then roll the plate to the desired length by longitudinal rolling. In the horizontal rolling stage, the existing technology is based on the principle of constant metal volume of the rolled piece, and ignores the slight natural expansion. Assuming that the rolled piece is always a standard rectangular body, calculate the thickness of the rolled pi...

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