A head and tail width control method for variable step distance of a fixed width machine

Abstract

The present invention provides a head and tail width control method for variable step pitch of a fixed-width machine, comprising: when the head of a slab enters the fixed-width machine, the step distance of the fixed-width machine is set by using a first change law, and the first A change rule is that the step distance of the sizing machine increases with the roll gap stage of the slab head; when the middle part of the slab enters the sizing machine, the sizing machine is used to The width of the head of the slab is fixed, and the second change law is that the step distance remains unchanged; when the tail of the slab enters the width-fixing machine, the step distance of the width-fixing machine follows the third change law It is set that the third change rule is that the step distance is decreased in multiple stages; the change amount of each stage in the first and third change rules corresponds to the mirror surface. Through the layered control of the step distance of the fixed width machine, the problem of high hardness level, large amount of width reduction steel, and no metal binding at the head and tail ends leading to width loss is solved, which effectively improves the width control accuracy of the fixed width machine and improves the product quality. rate of technical effects.

Description

technical field [0001] The invention relates to the technical field of rough rolling of hot-rolled strip steel, in particular to a head-to-tail width control method with variable step pitch of a fixed-width machine. Background technique [0002] The width control of hot rolling mainly depends on the fixed width machine and the vertical roll. Wide range 0-50mm. According to the research on the accuracy of hot rolling width control equipment, it is found that after the slab is hit by the width fixing machine, the head and tail of the intermediate slab will lose width, and with the increase of the width reduction, the head and tail loss of width will become more obvious; When the head and tail width loss is serious, the vertical roller cannot be eliminated by short-stroke adjustment, resulting in excessive head and tail width of the finished product, which cannot meet customer needs and affects the yield of finished products. [0003] However, the applicant of the present inv...

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Problems solved by technology

[0005] The embodiment of the present invention provides a head-to-tail width control method with a variable step-pitch for a width-fixing machine, which solves the problem in the prior art that the head and tail widths cannot be effectively controlled for steel types with a large amount of width reduction and a high hardness level. technical problem

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