During the continuous operation of the strip rolled on the fully continuous cold rolling mill, the computer control system automatically sets the rolling process parameters and procedures according to the changes in the specifications of the rolling stock, so as to continuously roll the strips with different thickness specifications. technology.
The commonly used control method is: when the plate thickness change predetermined point passes through each stand, the pressing position and roll speed are sequentially corrected in real time, so that the optimal rolling conditions before the plate thickness change smoothly transition to the optimal rolling condition after the plate thickness change. Excellent rolling conditions.
What needs to be paid attention to when performing dynamically variable specification rolling is: suppressing the tension fluctuation between the stands to prevent strip breakage; shortening the over-tolerance length of the plate thickness change part. With the development of computer control technology and the continuous improvement of the dynamic continuous rolling analytical model, the control effect is constantly improving.
Now, the plate thickness change range reaches 600μm, the length of the out-of-tolerance part is as short as about 1.5m, and the tension fluctuation can be controlled within ±20%.
Dynamic specification technology is the key to whether a fully continuous rolling mill can achieve fully continuous rolling (also known as endless rolling) (see cold-rolled plate and strip production). It was first used in the second cold rolling mill of Fukuyama Steel Pipe Company in Japan in 1971. 1420mm five-stand fully continuous cold rolling mill.
The 2030mm five-stand fully continuous cold rolling mill in Shanghai, China also uses dynamic specification technology.
Link to this article：Dynamic variable specification rolling
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