Variable step pitch head-tail width control method of fixed width machine

Abstract

The invention provides a variable step pitch head-tail width control method of a fixed width machine. The method comprises the steps that the step pitch of the fixed width machine is set according toa first variation rule when the head of a plate blank enters the fixed width machine, and the first variation rule means that the step pitch of the fixed width machine is increased with the roll gap of the head of the plate blank in a staged mode; when the middle portion of the plate blank enters the fixed width machine, the width of the head of the plate blank is fixed through the fixed width machine, and the step pitch is constant according to a second variation rule; when the tail of the plate blank enters the fixed width machine, the step pitch of the fixed width machine is set in accordance with a third variation rule, and the third variation rule means that the step pitch is decreased in a multi-staged mode; and the variation amounts of all the stage of the first variation rule and the third variation rule are in mirror symmetry. The method achieves the technical effects that through layered control over the step pitch of the fixed width machine, the problem that the head end andthe tail end of metal of steel with high hardness level and widened amount are not restrained, and consequently width reduction is caused is effectively solved, the width control precision of the fixed width machine is effectively improved, and the product yield is increased.

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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