A method for tracking the position of the head of the steel strip in a steckel mill

Abstract

The invention provides a method for tracking the head position of a steel strip in a steckel mill, which belongs to the technical field of metal processing. In this method, two hot metal detectors are installed at different positions between the steckel mill and the coiler. After the steckel mill bites in, the strip head position tracking calculation is started, and the rising edge signal of the hot metal detector is used to Correct the tracking position of the strip head. When the strip head passes the second hot metal detector and triggers the rising edge signal, the forward slip value is corrected and calculated, and then the subsequent head is completed using the corrected forward slip value. The internal tracking calculation is carried out, and finally the forward slip calculation model is self-learning corrected through the corrected forward slip value. The invention has less hardware investment and obvious effect, ensures the tracking accuracy of the strip head of the steckel mill, and effectively improves the strip threading success rate of the steckel mill.

Description

technical field [0001] The invention relates to the technical field of metal processing, in particular to a method for tracking the head position of a steel strip in a steckel mill. Background technique [0002] The furnace coil rolling mill adopts single-stand four-high reversible rolling, and a furnace coiler is arranged at the front and back of the rolling mill, and the strip steel is heat-preserved and rolled through the coiling furnace. The coiler shaft has a notch for the strip head Only when the head of the strip enters the notch of the shaft of the coiler correctly can the normal progress of rolling be guaranteed. If the length of the head of the strip into the notch is too long, there will be relative sliding between the strip and the mandrel, which will seriously affect the quality of the head of the strip, and will also impact the coiler mandrel, reducing the mandrel. Life, if the length of the strip steel head entering the notch is too short or does not enter th...

AI Technical Summary

Problems solved by technology

The linear speed of the roll can be accurately measured by the speed encoder, and the forward slip value is often calculated by the forward slip model. According to the forward slip value formula and control theory, the factors affecting the forward slip value of the steckel mill mainly include: ratio, friction coefficient, roll diameter, mill exit thickness, and front and rear tension, etc. Since the above variables change greatly during the strip threading process of the steckel mill, there is a certain deviation between the forward slip value calculated by the model and the actual forward slip value, which affects the The tracking accuracy of the strip head. At the same time, the hot metal detector detects the position of the strip through infrared heat radiation. The temperature of the strip head is different, and the timing of the hot metal detector signal is different: the temperature of the strip head is higher When , the generation of the hot metal detector signal is ahead of the actual position of the strip head; when the temperature of the strip head is low, the generation of the hot metal detector signal lags behind the actual position of the strip head, so the tracking position correction brings Negative Effects

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