A Control Method for Elongation Fluctuation of Temper Mill

Abstract

The invention belongs to the technical field of cold-rolled strip steels and discloses a control method for a ductility fluctuation of a temper mill. The control method comprises the following steps: obtaining a strip steel speed at an inlet of the temper mill and a strip steel speed at an outlet of the temper mill to obtain an actual ductility of the strip steel; obtaining a first ductility deviation value according to the actual ductility of the strip steel and a set ductility set of the strip steel; obtaining a rolling force correction value from the first ductility deviation value through a ductility proportional-integral controller; and obtaining a second ductility deviation value according to the rolling force correction value. The control method is capable of improving the ductility control accuracy at low-speed and acceleration / deceleration stages, and meanwhile, ensuring the ductility control accuracy at a high-speed stage and reducing a ductility deviation section length of each of the head and the tail of the strip steel.

Description

technical field [0001] The invention relates to a rolling method of cold-rolled strip steel, in particular to an elongation control method. Background technique [0002] After recrystallization annealing, the cold-rolled strip steel eliminates the work hardening structure, but the mechanical properties and processing properties deteriorate. At this time, the stress-strain curve of the strip steel has an obvious upper yield limit, and a yield plateau appears at the lower yield limit. The methods to eliminate the yield plateau include temper rolling, tensile deformation and straightening, etc. Mass production practice has proved that temper rolling is the most effective processing method and is widely used in large-scale production. [0003] Different from conventional cold rolling, tempering is essentially a small deformation (0.5% to 5%) rolling, which is an important production process in the cold rolling process. Elongation is the most basic process parameter in leveling....

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Problems solved by technology

[0005] In the existing technology, the continuous annealing and tempering machine has large fluctuations in the flat elongation of the strip under the conditions of passing the weld, acceleration and deceleration, and low speed. Cracking, Orange Peel Defects

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