A Control Method for Alleviating Temperature Fluctuation in Finish Rolling

Abstract

The invention discloses a control method for alleviating final rolling temperature fluctuation. The control method comprises the following steps: step1, acquiring a first watermark point position and obtaining the cycle length of the watermark point according to the measured length of the watermark point; step2, periodically controlling to close and open the rack water on the outlet through the watermark point position, the watermark point length and the cycle length of the watermark point. The control method is characterized in that the finish rolling rack water is automatically controlled, and the occurrence cycle of the watermark point can be calculated according to the distance of the walking beam, the F23 rack water is periodically closed to keep away from the position of the watermark point, and thus the scope of the low-temperature watermark point can be alleviated and the final rolling temperature fluctuation scope can be also alleviated.

Description

technical field [0001] The invention relates to a temperature control method in a hot rolling process, in particular to a control method for alleviating temperature fluctuations in finish rolling. Background technique [0002] When the slab is fired in the heating furnace during the hot rolling production process, the walking beam structure of the heating furnace makes the temperature of the contact between the slab and the beam lower. After rolling, these lower temperature places will form watermark points, that is, the finished product The length is about 40m, and there are periodic temperature valleys, which lead to temperature fluctuations similar to sinusoidal curves in the whole field of hot-rolled coils. This leads to rolling instabilities throughout the length, and low temperature blockades. Specific as figure 1 As shown, the finish rolling temperature has periodic fluctuations, and the corresponding finishing rolling force also has periodic fluctuations, and becau...

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Problems solved by technology

Because the FT temperature measurement point is away from the F7 outlet (Fi is known in the art to identify the number of the rack outlet, where i is a natural number), and the rack water has a certain distance, often when the temperature measurement point detects the temperature valley of the watermark point , the watermark point of this section has already passed the position of the rack water, which leads to a very lagging response to the opening and closing of the rack water, and the control effect is poor

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