A method of asynchronous roll shifting control for work rolls in downstream stands of hot continuous rolling

Abstract

The invention relates to an asynchronous roller alternating control method for band steel hot rolling downstream rack working rollers. After a rolled piece is rolled, upper and lower working rollers horizontally move at the same distance in an opposite direction, then a next rolled piece is rolled, and the upper and lower working rollers periodically alternate to and fro between forward and reverse maximum roller alternating stroke positions in a band steel rolling production process, so that phasic positive and negative deviation is respectively performed on previous three downstream racks onthe basis of the same roller alternating function, and asynchronous roller alternation is formed on the three racks. According to the roller alternating control method, on one hand, the control ability on wedge and deviation is increased through asynchronous phasic adjustment, and on the other hand, the bad influence caused by multi-rack roller alternating zero-position superposition in the wholeroller alternating cycle can be avoided, so that the control stability of all strip-shape indices is increased, and the rolling kilometer is extended.

Description

technical field [0001] The present invention relates to the technical field of roll shifting control of the downstream stand of hot continuous rolling and finishing rolling, in particular to an asynchronous roll shifting control method for the working rolls of the downstream stand of hot continuous rolling, which belongs to the strip shape control technology in the field of strip rolling Roll shifting control method. Background technique [0002] The development of roll shifting control methods has experienced two stages: equal parameter roll shifting and variable parameter roll shifting. Equal parameter roll shifting refers to periodic reciprocating roll shifting by maintaining a fixed roll shifting stroke, roll shifting step size and roll shifting frequency throughout the rolling cycle. Variable parameter roll shifting refers to the roll shifting control method in which the roll shifting stroke, roll shifting step size and roll shifting frequency change during the entire ...

AI Technical Summary

Problems solved by technology

However, at present, all roll shifting control methods are limited to the same direction or reverse roll shifting of each frame, that is, the zero position of the roll shifting position of each frame coincides, and the limit position of each frame roll shifting coincides. This kind of roll shifting control method does not It is beneficial to the overall stability of product control indicators, that is, it is easy to cause "cat ear shape" wear when rolling some strips. The roll shifting limit positions with the least wear are superimposed on each other, resulting in continuous fluctuations in the strip section and edge drop indicators throughout the service life of the rolls, which is not conducive to the stability of product indicators

Images