Roll gap calibration control method of large six-roll CVC cold rolling mill

Abstract

The invention relates to the technical field of control of rolling mills in the metallurgical industry, and discloses a roll gap calibration control method of a large six-roll CVC cold-rolling mill. The method calibrates a roll gap zero position through roll system pressing after rolls of the CVC cold-rolling mill are replaced, and comprises the following specific steps of roll gap pre-calibration, screw-down mechanism position control, rolling force control mode switching, main transmission speed switching and rolling oil system control. The closing process of upper and lower roll systems ofthe rolling mill is divided into two sections of speeds, the closing speed of the second section of roll gap is reduced, and therefore impact force generated at the moment when the upper and lower roll systems make contact can be reduced. In the roll gap closing process, working rolls rotate at a low speed of 20 m / min, under the lubricating and cooling effects of rolling oil, the working rolls arein dynamic contact, damage to the surfaces of the rolls due to local stress in the process is avoided, transverse roll marks generated in the static pressing process of the rolls are effectively avoided, the service life of the rolls is prolonged, and the production efficiency and the product quality are improved.

Description

technical field [0001] The invention relates to the technical field of control of rolling mills in the metallurgical industry, in particular to a roll gap calibration control method for a large six-high CVC cold rolling mill. Background technique [0002] In recent years, with the development of industrial technology, the demand for cold-rolled products is increasing, and the requirements for the surface quality of cold-rolled strips are also getting higher and higher. In order to ensure the surface quality of strips, good work roll surface quality is required to provide support . For large-scale cold rolling mills, calibration is performed after the rolls are replaced, or during the production of gap warm rolls, the rolling mill needs to close the roll gap under no-load conditions. At the moment of closing the roll gap, the upper and lower work rolls are impacted, and the surface topography of a local area is destroyed, which is transferred to the strip surface, forming pe...

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Problems solved by technology

Rolling of products that cannot meet high quality requirements

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