Method for controlling temperature of strip steel tail part in U-type cooling

Abstract

The invention discloses a method for controlling a temperature of a strip steel tail part in U-type cooling. The method comprises the steps that a tail part positioning error caused by a strip steel length calculation problem is reduced, and interference on tail part temperature controlling due to length differences of different strip steels is eliminated, wherein the tail part positioning error caused by the strip steel length calculation problem is reduced, meanwhile, due to an optimized model self-learning method, the interference on the tail temperature controlling due to the length differences of the different strip steels under the condition of the same U-type cooling process is eliminated, so that the process conformity of the U-type cooling strip steel tail part controlling processis greatly improved, and the production rate of waste, defective and degraded products caused by inconformity in the process is reduced.

Description

technical field [0001] The invention relates to a hot-rolled laminar flow cooling process, in particular to a method for controlling the temperature of the tail of a U-shaped cooling strip. Background technique [0002] In the laminar cooling process of hot rolling, in order to improve the difference in the uniformity of the cooling process between the head and tail of the strip and the middle of the strip, a cooling process of "hot head and hot tail" is often used, that is, the specified interval between the head and tail of the strip Its target coiling temperature is different from that in the middle of the strip. Usually, the target coiling temperature of the head and tail is slightly higher than that of the middle part, and the target temperature curve is similar to the letter U, so this cooling process is also called "U-shaped cooling". [0003] Generally, five key parameters can be used to describe the process requirements of U-shaped cooling: the length Lhead of the ...

AI Technical Summary

Problems solved by technology

[0019] However, because the shape of the slab is not completely regular, or there is a certain deviation between the information of the slab and the actual situation, the Ltotal value calculated according to formula (2) will be quite different from the actual value

When the calculated value of Ltotal is much larger than the final actual value, it is easy to cause the tail target temperature to be raised in the future, and the strip has been rolled; when the calculated value of Ltotal is much smaller than the final actual value, it is easy to cause the tail The target temperature rise distance is too long

Both of these cases do not meet the requirements of the cooling process for tail length control

[0020] In addition, because the actual lengths of different strips are often different, even if the same U-shape cooling process requirements are adopted, the absolute distance from the tail of the strip to the target temperature rise area will vary greatly, and there will be a large difference in a certain area because The difference in strip length makes the same physical position in different cooling states in different strips, resulting in large fluctuations in the control process of this section, and it is easy to appear that the temperature control does not meet the process requirements, such as figure 2 shown

Images