A method to improve the success rate of roll change calibration of rolling mill work rolls

Abstract

The invention relates to a method for improving the success rate of calibration of work rolls in a rolling mill. The parallelism of the upper and lower work rolls is checked by means of rolling force detection and calculation methods. After the roll change, the automatic calibration of the rolling mill is started and completed. Check the rolling force; check the change of the rolling force deviation of the rolling mill under the conditions of no-load and checking rolling force, if the rolling force deviation increment after the automatic calibration of the rolling mill after two adjacent roll changes is consistent, and the plate shape is straight when the first piece of steel is actually rolled, this increment is determined as the standard value of the horizontal roll gap of this back-up roll cycle, if the rolling force of the rolling mill is automatically calibrated after two adjacent roll changes If the deviation increment changes, it is judged that the upper and lower work rolls are not parallel, and the roll gap appears wedge-shaped, then adjust the roll gap deviation to level the upper and lower work rolls, and the roll gap adjustment amount is equal to the multiple of the difference between this increment and the standard value. This method checks quickly, and it takes 15‑20 seconds to check once, without affecting normal production.

Description

technical field [0001] The invention relates to the field of hot strip steel production, in particular to a method for improving the success rate of calibration of work rolls in rolling mills. Background technique [0002] In the past, the finishing unit of the hot strip steel production line had to replace the work rolls 8 to 10 times a day. Factors such as the diameter of the work rolls, the height of the step backing plate, and the clearance of the pressing mechanism will all change after the roll change. The levelness of the roll changes, and the first piece of rolling is prone to accidents such as large head bending or direct steel jamming. According to statistics, there are about 10-20 accidents per month when the 1580 line is at its peak, and there are accidents such as rolling off, rolling, waxing, and shutdown to replace work rolls, which has a great impact on production and seriously affects the production rate. The original calibration method is to press the tota...

AI Technical Summary

Problems solved by technology

[0002] In the past, the finishing unit of the hot strip steel production line had to replace the work rolls 8 to 10 times a day. Factors such as the diameter of the work rolls, the height of the step backing plate, and the clearance of the pressing mechanism will all change after the roll change. The levelness of the roll changes, and the first piece of rolling is prone to accidents such as large head bending or direct steel jamming

According to statistics, there are about 10-20 accidents per month when the 1580 line is at its peak, and there are accidents such as rolling, rolling, folding, waxing, and shutdown to replace work rolls, which has a great impact on production and seriously affects the production rate.

The original calibration method is to press the total rolling force of the rolling mill to 1500 tons (F7 to 1000 tons) after changing the rolls, adjust the deviation of the roll gap, and adjust the rolling force deviation of the two sides of the pressure head to within ±50 tons. The roll gap is calibrated as zero roll gap, this calibration method cannot guarantee the parallelism of the upper and lower work rolls