On-line abrasion measuring method for hot rolling supporting roll

Abstract

The invention discloses an on-line abrasion measuring method for a hot rolling supporting roll. The on-line abrasion measuring method is characterized by comprising the following steps: I, selecting historical data; II, screening the selected data; III, checking valid data; IV, grouping the screened data; V, calculating system error; VI, separating the error data; VII, obtaining abrasion data. According to the on-line abrasion measuring method based on the convexity error separation technology, the on-line abrasion measurement of the supporting roll is realized; through the utilization of the historical data, the measurement period is effectively shortened, and the on-line abrasion measurement of the supporting roll is effectively realized; meanwhile, the intermediate measured data can be obtained so as to be beneficial to develop and optimize a supporting roll abrasion model; the control precision of the flatness control system is improved; the rolling stability is improved.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to an on-line measurement method for wear of hot-rolled backup rolls in the hot-rolled steel rolling process technology. Background technique [0002] In the hot continuous rolling strip production plant, the working environment of the back-up rolls is very harsh, and the roll-changing cycle is long, and the back-up rolls will be severely worn, especially the back-up rolls of the downstream stand, which are important for controlling the shape of the strip, are more worn. for serious. In addition, wear is a constantly changing process, and its changes directly affect the strip shape and rolling stability. For this effect, it is generally compensated by the method of predicting the wear model of the backup roll in the shape control system. The prediction accuracy of the model depends entirely on whether the wear amount of the backup roll can be accurately measured during the service life. T...

AI Technical Summary

Problems solved by technology

[0003] The existing roll wear measurement technology is divided into two types: off-line measurement and on-line measurement: off-line measurement is to directly measure the wear amount through special equipment (grinder or roll profiler), this method can only be realized after the roll is replaced, each change The roll cycle can only be measured once, and the wear data of the roll in use cannot be obtained. If only one final wear data after the replacement of the backup roll is used to predict the wear change trend within 2 to 3 weeks, the error will be very large, which will lead to flatness control. The control precision of the system is low, and rolling waste accidents may occur in severe cases; online measurement includes independent displacement sensor measurement method and indirect measurement of roll shape through the pressure between the grinding wheel and the roll contact, these two measurement methods are only applicable to roll shape measurement of work rolls , which cannot be applied to the measurement of backup rolls, and the measured roll shape data is a comprehensive amount of thermal crown and wear, and it is impossible to obtain separate wear data

Therefore, none of the existing technologies can realize online measurement of back-up roll wear

[0004] Due to the inability to measure the change in wear of the backup roll during its service life, the prediction of the wear model of the backup roll is inaccurate, and the flatness control system often misadjusts, resulting in poor flatness of the product; at the same time, the instability of the flatness control also causes the finish rolling Instability of the rolling process, resulting in an increase in accidents such as breakage and flicking of the finish rolling, scrap steel and coiling scrap steel

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