Staged control method for camber based on the flat shape of the hot-rolled middle blank

Abstract

The invention provides a staged control method for camber based on the flat shape of the hot-rolled middle blank. It can fulfill the precise control of complex camber. The method comprises the steps of: acquiring the coordinates of the edge point at the operation side on the surface of the middle blank and the coordinates of the edge point of the transmission side; determining the coordinates of the center line point in the width direction of the middle blank based on the acquired coordinates of the edge point at the operation side and the edge point of the transmission side; fitting the curve on the center line point coordinates in the width direction of the middle blank, dividing the length direction of the middle blank into sections; determining the total roll gap leveling value of each section of the middle blank; tracking the location of the middle blank in the rolling process, generating the control strategy of the downward inclination in sections of the total length of camber in the middle blank based on the total roll leveling value of each section of the middle blank. This invention can be used to the online control of the hot-rolled middle blank camber.

Description

technical field [0001] The invention relates to the technical field of automatic control of steel rolling, in particular to a method for segmental control of camber based on the plane shape of a hot-rolled intermediate slab. Background technique [0002] The camber of the hot-rolled intermediate slab is the main manifestation of the asymmetric defect of the slab in the rough rolling stage of hot rolling. The root cause of the camber phenomenon is that the length extension of the two sides of the slab is different. The main reasons for the different extensions on both sides are: the temperature on both sides of the intermediate billet is different; the stiffness on both sides of the rolling mill is different; the gap between the archway and the bearing seat is too large; the side guide plate is not well aligned. Once the hot-rolled camber is formed in the rough rolling stage, it will cause difficulties in strip threading, deviation and even steel stacking in the subsequent fi...

AI Technical Summary

Problems solved by technology

First of all, the center line of the intermediate billet measured by the width measuring instrument cannot reflect the overall rotation of the intermediate billet after it exits the rolling mill, and there is a certain gap between the measured result and the real camber shape of the intermediate billet. Poor rigidity on both sides of the rolling mill, and the deviation of the intermediate billet in the roll gap caused by the bending of the intermediate billet. Finally, this method is only for the case where the intermediate billet has a regular "C-shaped" sickle bay, and only the first head that often occurs in production , partially curved tail and "S-shaped" complex sickle curve do not have regulatory functions

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