Broadening rolling method with dynamic roll gap control

Abstract

The invention discloses a broadening rolling method with dynamic roll gap control. The broadening rolling method comprises the following steps of improving hydraulic pressure response speed, when a steel plate is in a last pass of broadening passes, lifting up a roll gap 1-2mm in the process of biting steel, pressing the roll gap 3-4mm in the process of steel plate rolling after normal biting steel, and pressing the roll gap when 400mm length of the steel plate is achieved through normal rolling. When the steel plate is close to the tail, the roll gap is lifted up 3-4mm to obtain a steel plate which is U-shaped. By the adoption of the broadening rolling method with the dynamic roll gap control, circular arcs of the head and the tail of the steel plate can be reduced, non-planed size is reduced, and yield is improved.

Description

technical field [0001] The invention relates to a steel plate rolling method, in particular to a widening rolling method utilizing dynamic roll gap control. Background technique [0002] With the intensification of market competition, how to improve the yield of steel plates and improve the competitiveness of enterprises is becoming more and more important. At present, there are two most commonly used widening and rolling methods for medium and heavy plates in the country: [0003] 1. Longitudinal widening and rolling: When the length of the slab is less than the width of the finished steel plate burr, and the length direction of the slab needs to be taken as the width of the finished steel plate, the slab after descaling and forming rolling will no longer turn the direction, but continue rolling When the length of the slab is rolled to the width of the burrs of the finished steel plate, it is turned 90 degrees to enter the elongation rolling stage. [0004] 2. Horizontal ...

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Problems solved by technology

[0005] The above widening and rolling method can help to improve the anisotropy of the steel plate, but there are problems: 1. There are requirements for the material type, and if the width is too large, it will be bulging; the rectangularity of the steel plate is poor; 2. It cannot solve the head and tail 3. In the case of complex material type, it is easy to cause excessive widening or insufficient width, and the increase in size is unplanned