Cold-rolling strip steel threading method

Abstract

The invention discloses a cold-rolling strip steel threading method, which belongs to the field of strip steel rolling. The cold-rolling strip steel threading method comprises the steps of (1) being in no hurry to pull a strip tail over a rolling mill after the rolling of a previous strip steel is completed and the strip tail is separated from a jaw; (2) carrying out feeding operation of a next strip steel by an uncoiling worker, and feeding the head part of the next strip steel to the outer side of an inlet oil scraper roller of the rolling mill; (3) enabling the uncoiler running speed V (uncoiling) to be equal to the rolling mill running speed V (rolling mill) after the tail part of the previous strip steel and the head part of the next strip steel are in up-and-down lap joint; (4) stopping the feeding by the uncoiling worker when the head part of the next strip steel reaches to the position of an outlet guide roller of the rolling mill by successfully penetrating through the rolling mill along with the tail part of the previous strip steel; and (5) coiling the tail part of the previous strip steel, and coiling the tail part of the previous strip steel to a steel coil. According to the cold-rolling strip steel threading method disclosed by the invention, a cold-rolling strip steel is prevented from being firstly inserted in a roller seam clearance between a working roller of the rolling mill and an intermediate roller or under an oil spray guide plate during a twenty-high rolling mill threading process, and successful threading operation is realized.

Description

technical field [0001] The invention relates to a strip threading method for cold-rolled strip steel, which belongs to the field of strip steel rolling. Background technique [0002] During the first uncoiling process of the cold-rolled strip on the rolling mill, the head is always hooked downward due to gravity and coiling. Therefore, during the strip threading process, the head is easily inserted into the gap between the work roll and the intermediate roll of the rolling mill or under the oil injection guide plate of the rolling mill, resulting in failure to thread the strip smoothly and damaging the surface of the work roll. Pre-machine workers are required to use special tools to cooperate with belt threading operations. In this way, not only the threading time is affected, but also the damaged work roll surface seriously affects the product surface quality. Contents of the invention [0003] In order to overcome the above disadvantages, the present invention aims to...

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Problems solved by technology

In this way, not only the threading time is affected, but also the damaged work roll surface seriously affects the product surface quality

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