Method for determining thermal crown of hot rolled strip roller

Abstract

The invention provides a method for determining thermal crown of a hot rolled strip roller, and belongs to the field of metal rolling. The method comprises the steps of periodically forecasting a rolling temperature filed through an online model of a finishing mill, and determining the initial temperature and the rolling thermal crown of a roller which is machined again. The method is characterized by comprising the steps as follows: reading the rolling temperature field of the unloading time of the roller through an online computer model; calculating the dynamic variation of the temperature field according to a cooling condition of an unloaded roller; determining the machining temperature and the crown according to the temperature generated after unloading; processing/calculating such data, thus providing the accurate initial temperature of the roller for machining again; forecasting the temperature field and the thermal crown of a working roller; and improving the precision in forecasting of the thermal crown of the holt roller and the shape setting control. With the adoption of the method provided by the invention, the problem that the initial temperature of the roller which is machined again when the roller is not repeatedly worn cannot be accurately given during producing the hot rolled strip roller can be solved; and the method can be widely applied to the technical field of thermal crown forecasting and shape control of roller during producing the hot rolled strip roller.

Description

technical field [0001] The invention belongs to the field of metal rolling, and in particular relates to a control device or method specially suitable for metal rolling mills or processed products thereof. Background technique [0002] In the production of hot-rolled strip steel, the thermal expansion caused by the heating of the roll will affect the size and shape of the roll gap, and then affect the thickness, crown and flatness control of the strip steel. Especially the shape quality control accuracy depends to a large extent on the calculation accuracy of the thermal deformation of the roll. Moreover, the thermal behavior of the roll is closely related to the cracking, texture and peeling of the roll surface. [0003] Therefore, it is extremely important to accurately predict the temperature field and hot crown of the work roll, and it is an important part of the online computer control model of the hot rolling production. [0004] At present, high-speed steel rolls ha...

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is to provide a method for determining the thermal crown of hot-rolled strip steel rolls, which aims at the problem that the initial temperature of the rolls cannot be accurately given when the rolls are put on the machine again without regrinding in the production of hot-rolled strips , according to the cooling conditions after the roll is off the machine, the roll temperature field model is established, and the roll temperature field at any time after the roll is off the machine is calculated. control precision

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