Method for controlling temperature of watermark points of strip steel

Abstract

The invention discloses a method for controlling the temperature of watermark points of strip steel. The method includes the following steps: (1) parameters of fixing beams of a heating furnace, the size of a slab, the size of an intermediate billet and the size of the strip steel in a finishing milling rack are determined; (2) an actual-measurement temperature sequence of the head of the intermediate billet is processed, the lowest temperature point and the position of the lowest temperature point are determined, and the standard deviation of the temperature sequence is calculated; (3) the starting position of a first watermark region of the intermediate billet is calculated, according to the volume invariability theorem, the starting position of a corresponding first watermark region on the strip steel in the rack is calculated, the widths of the watermark regions on the strip steel are calculated, the cycle interval of the watermark regions is calculated, if the standard deviation of actual measurement temperature values is small, a setting parameter is set to be -1, and watermark control is not carried out; (4) the watermark temperature control parameters are sent to a basic automation system for setting control. The method is simple and practicable, control over the temperature of the strip steel can be effectively improved, and the temperature accuracy can be improved.

Description

technical field [0001] The invention relates to a method for controlling the temperature of strip steel, in particular, according to the data analysis of the measured temperature of the intermediate billet of strip steel, the position and period of the watermark on the intermediate billet are determined, and the watermark point is improved by setting and controlling the cooling water of the hot rolling stand The method for finishing rolling temperature specifically relates to a method for controlling the temperature of strip steel watermark points. Background technique [0002] The final rolling temperature of hot-rolled strip steel is an important process index of the product, and the temperature control accuracy determines the performance of the product. [0003] If the temperature accuracy of the finish rolling is well controlled, not only can the performance of the product be guaranteed, but also the quality blocking rate can be effectively reduced, the yield rate can be...

AI Technical Summary

Problems solved by technology

[0010] 1. Feedback control has a large hysteresis, and is prone to overshoot. At the same time, there is no special treatment for the watermark temperature zone of the intermediate billet, and it is difficult to overcome the non-monotonic temperature inhomogeneity

[0011] 2. Feedforward is usually only based on the predicted head-to-tail temperature difference of the predicted strip to compensate the control, or calculate the temperature distribution in the finishing stand according to the actual measured temperature, and set the required stand water volume for the full length direction of the strip. This method calculates The volume is large, and it is necessary to install valves and other equipment with flow or pressure that can be adjusted linearly between the finishing stands

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