Method for calibrating vertical rolling centerline of universal mill

Abstract

The invention discloses a method for calibrating a vertical rolling centerline of a universal mill. By using the method, the number of scrapped steel rails caused by adjusting the universal mill can be reduced effectively when producing structural steels with asymmetric section of heavy rails and the like. In the method, vertical rolls at the two sides of the universal mill respectively press against calibration surfaces at the two sides of a horizontal roll of the universal mill so as to obtain a vertical centerline between the two vertical rolls, then the obtained vertical centerline is calibrated as the vertical rolling centerline of the universal mill; and in the process of calibration, according to the forces upon the two vertical rolls in the process of actually rolling the universal mill so as to cause the vertical rolling centerline to horizontally shift to the vertical roll with less force. The method can narrow even and eliminate the horizontal offset distance between the vertical centerline obtained in the process of calibration and the vertical rolling centerline obtained in the process of actually rolling the universal mill through the technological means, thereby improving the rolling accuracy and reducing the number of scrapped steel rails caused by adjusting the universal mill. The invention is suitable for producing the structural steels with asymmetric section of the heavy rails and the like.

Description

technical field [0001] The invention relates to a calibration method for the rolling center line of a universal rolling mill. Background technique [0002] Before using the universal rolling mill, the horizontal rolling centerline and the vertical rolling centerline of the universal rolling mill must be determined first. This process is called the calibration of the universal rolling mill rolling centerline. The calibration accuracy directly determines the rolling product accuracy. In the existing calibration process, the horizontal centerline between the two horizontal rollers obtained after the upper and lower horizontal rollers move in the vertical direction and press against each other is the horizontal rolling centerline of the universal rolling mill. The vertical centerline between the vertical rollers on both sides obtained by pressing the vertical rollers on both sides respectively against the calibration surfaces on both sides of the horizontal roller at the same ti...

AI Technical Summary

Problems solved by technology

For steel mills, the above-mentioned operations have become a common practice, so the scrapped rails for adjusting the universal rolling mill are usually considered necessary to ensure the rolling precision of the universal rolling mill, so no one has delved into the specific reasons for the above-mentioned rolling errors

[0004] However, the inventors of the present application have found that the main cause of the above-mentioned rolling error is that there is a gap in the installation structure of the upper and lower horizontal rolls of the existing universal rolling mill to make the upper and lower horizontal rolls move horizontally; When drawing the center line, since the DS side vertical roller and the OS side vertical roller press against the calibration surfaces on both sides of the horizontal roller respectively, the gap between the upper and lower horizontal rollers moving horizontally toward the DS side vertical roller and toward the OS side vertical roller respectively The gap of horizontal movement cannot be eliminated; when rolling heavy rails, the rolling force of the vertical roll on the OS side is greater than the rolling force of the vertical roll on the DS side due to the requirements of pass design. At this time, due to the horizontal movement gap of the upper and lower horizontal rolls The existence of the pass, the vertical center line of the pass formed by the upper and lower horizontal rolls and the vertical rolls on both sides will deviate to the DS side vertical roll with a smaller rolling force, resulting in the center line data in the actual rolling process and Calibration data error, resulting in product scrap

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