Differential-thickness rolling method for medium-thickness plate

Abstract

The invention relates to a differential-thickness rolling method for a medium-thickness plate, and belongs to the technical field of production of medium-thickness plates in the metallurgical industry. According to the technical scheme, the number of passes of differential-thickness rolling is even, the first pass of differential-thickness rolling adopts the mode that the reduction rate is gradually increased, the thicknesses of a steel plate rolled by the first pass of differential-thickness rolling in the length direction are different, the upper surface of the steel plate has a certain gradient, the thinner end of the steel plate is engaged into the second pass of differential-thickness rolling, and in the second pass of differential-thickness rolling, the reduction rate is also gradually increased, the steel plate with the upper surface having the certain gradient is rolled into a flat plate with the consistent thickness in the length direction, and so on until the last pass of differential-thickness rolling. The method has the beneficial effects that low-pressure engagement and high-pressure steel throwing can be realized through differential-thickness rolling, so that the rolling reduction of the steel plate is greatly increased, the deformation of the core part of the steel plate is increased, the deformation is promoted to spread deep into the core part of a rolled piece, the performance of the steel plate is improved, the number of rolling passes can be reduced, and the rolling efficiency is improved.

Description

technical field [0001] The invention relates to a differential thickness rolling method for medium and heavy plates, which belongs to the technical field of medium and heavy plate production in the metallurgical industry. Background technique [0002] With the rapid development of national transportation, machinery manufacturing and other fields, the performance requirements for thick plates or high-strength and high-toughness steel plates produced by medium and heavy plates are getting higher and higher. However, thick plates and high-strength, high-toughness steel plates have the problems of insufficient compression ratio and uneven deformation in the conventional rolling process. The traditional rolling process is limited by the motor current and the biting conditions, and the pass reduction cannot be too large, because there is an impact torque when biting the steel, so it is impossible to roll the steel plate with a large reduction, so that the core cannot be obtained. ...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for differential rolling of medium and heavy plates, which can avoid the problems of insufficient compression ratio and uneven deformation in the conventional rolling process of high-strength and high-toughness steel plates, thereby increasing the deformation of the core of the steel plate quantity, improve the performance of high-strength, high-toughness steel plate, and solve the problems existing in the background technology

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