Temperature control method in hot-rolled strip tailing-out process

Abstract

The invention discloses a temperature control method in the hot-rolled strip tailing-out process. The method comprises the following steps of: determining that the strip tail enters finish rolling and a flying shear enters a tail-cut state according to a signal of the strip tail; ensuring that the strip tailing-out temperature is constant by dynamically controlling a highest-speed deceleration point; according to the strip tailing-out temperature and the coiling temperature, setting the maximum cooling capacity when the strip steel passes through a laminar flow cooling area at the highest speed and calculating the opening position of a first cooling valve; and according to the actual strip tailing-out temperature and the difference between the finishing temperature and the coiling temperature, correcting the number of opened cooling valves so as to meet the coiling temperature of the strip tail. The highest-speed deceleration tailing-out is dynamically controlled, so that the positionof the tailing-out deceleration point is well positioned, the finishing temperature is kept constant in the strip tailing-out process further, and the coil temperature when the strip steel is coiled is in a reasonable margin tolerance finally.

Description

technical field [0001] The invention relates to the field of temperature control in the process of throwing hot-rolled strip steel, and more specifically relates to a temperature control method in the process of throwing steel at the end of hot-rolled strip steel. Background technique [0002] In the hot rolling process technology, laminar flow cooling is mainly used for cooling the strip steel after finishing rolling, so that the strip steel is cooled from a higher final rolling temperature to the required coiling temperature. Since the coiling temperature has a great influence on the properties of the strip, the coiling temperature must be controlled within the tolerance range of the temperature. At present, the laminar flow cooling mainly adopts the way of spraying water through valves, and the cooling water can cool down the hot-rolled strip by adjusting the number of valves. [0003] see figure 1 In the hot-rolled strip throwing process shown, the strip 10 is threaded...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem in the prior art that the temperature of the strip steel tail cannot be well guaranteed under the highest speed deceleration steel throwing operation state, the purpose of the present invention is to provide a temperature control during the steel strip throwing process at the tail of the hot-rolled strip steel method, so that the strip can be within the required temperature range during coiling

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