Rough rolling temperature-measuring feedback control method

Abstract

The invention relates to a rough rolling temperature-measuring feedback control method. The method comprises the steps of presetting a classification steel grade database and establishing an initial furnace gas temperature model of every section; measuring the upper surface temperatures and the lower surface temperatures of slabs out of a furnace recently; calculating a distribution ratio modification value of a steel grade of the same kind according to the upper surface temperatures and the lower surface temperatures which are actually measured; and controlling set values of the furnace gas temperatures of furnace gas on the upper portion and the lower portion of every section of the current slab of a heating furnace according to the distribution ratio modification value. According to the method and a system, the temperature setting upper and lower distribution ratios inside the heating furnace are dynamically amended by utilizing actual values of the upper and lower surface temperature difference of the slabs out of the furnace, and temperatures of the upper surfaces and the lower surfaces of the slabs in the heating furnace can be automatically precisely adjusted according to the actual wire rolling requirements, the control level of a rough rolling raising buckling head is remarkably improved, and the thermal engineering automatic control system simultaneously greatly reduces labor intensity of workers.

Description

technical field [0001] The invention relates to a thermal automatic control of a steel rolling heating furnace, and more specifically, to a rough rolling temperature measurement feedback control method. Background technique [0002] The heating temperature of hot-rolled strip is closely related to product quality, and is one of the key factors affecting the microstructure and properties of hot-rolled strip. In production, in order to make the steel easy to roll, different heating specifications must be adopted according to the characteristics of the steel itself, and the temperature difference between the upper and lower surfaces of the slab is also an important parameter. During the rolling process of the strip steel, the temperature of the upper and lower surfaces is different, and the temperature drop at the head and tail of the strip steel is larger, and the temperature difference is more obvious, which causes the metal flow rate of the upper and lower surfaces of the st...

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Problems solved by technology

[0008] In order to solve the above-mentioned shortcomings of the prior art, the main purpose of the present invention is to provide a rough rolling temperature measurement feedback control method, which can accurately control the temperature difference between the upper and lower surfaces of the slab in the heating furnace according to the needs of the rolling line, thereby improving The warping of the slab after the slab is out of the furnace makes the output of the rolled piece smooth, thereby avoiding a large impact on the rolling equipment

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