CN-117753799-B - Elongation control method of continuous annealing six-roller cold rolling temper mill

Abstract

The invention discloses an elongation control method of a continuous annealing six-roller cold rolling temper mill, which comprises the following steps of collecting actual production data of a cold rolling production line, monitoring tracking data of the cold rolling production line, utilizing a field control PLC to read production data of strip steel, establishing a linear regression model between thickness, width and target elongation of the strip steel and PID control parameters, selecting an optimal PID control parameter according to the target elongation of the strip steel, utilizing a PID controller to regulate the elongation of the strip steel, enabling the strip steel to enter a flattening process, detecting whether the elongation of the strip steel changes in the flattening process, readjusting the PID control parameter if the elongation of the strip steel changes, and maintaining the current PID control parameter until the tail of the strip steel completes the flattening process if the elongation of the strip steel does not change. The method can automatically adjust the elongation of the strip steel according to the strip steel with different specifications, reduce the overshoot and the adjustment time of the steel types with different specifications, reduce the inconsistent length of the head and the tail extension, and improve the yield of the strip steel.

Inventors

• WU JIATONG
• XIAO XIAO
• WANG JUNFEI

Assignees

• 宝钢湛江钢铁有限公司

Dates

Publication Date

20260505

Application Date

20231201

Claims (3)

1. 1. The elongation control method of the continuous annealing six-roller cold rolling temper mill is characterized by comprising the following steps of: Collecting actual production data of a cold rolling production line, wherein the actual production data at least comprises strip steel thickness, strip steel width and strip steel target elongation; Monitoring tracking data of a cold rolling production line, reading thickness, width and target elongation of strip steel by utilizing a field control PLC, taking the thickness, width and target elongation of the next strip steel as input values when the weld joint position of the next strip steel and the current strip steel is close to a leveling machine, taking PID control parameters of the next strip steel as output values, and establishing a linear regression model between the input values and the output values, wherein the linear regression model is as follows: K p ＝1.58t*10 -1 -1.59w*10 -4 +4.99e*10 -1 , K i ＝9.98t*10 -2 -5.95w*10 -4 -1.65e*10 -2 , K d ＝-2.05t*10 -4 +4.61w*10 -7 +1.18e*10 -4 , Wherein t is the thickness of the strip steel, w is the width of the strip steel, e is the target elongation of the strip steel, and K p 、K i 、K d is the proportional, differential and integral control parameters of the PID controller; Step three, the PID control parameters obtained in the step two are stored in a PLC data block, when the welding seam position of the next coil of strip steel and the current coil of strip steel reaches a leveling machine, the optimal PID control parameters are selected according to the target elongation of the strip steel, the elongation of the strip steel is regulated and controlled by a PID controller, and the strip steel enters a leveling procedure; Detecting whether the elongation of the strip steel changes in the leveling process, returning to the step II, readjusting the PID control parameters to enable the PID control parameters to be adjusted to the optimal parameters matched with the thickness and the width of the current strip steel if the elongation of the strip steel changes, maintaining the current PID control parameters if the elongation of the strip steel does not change, continuing the leveling process of the strip steel until the tail of the strip steel completes the leveling process, and returning to the step II, and executing calculation of the PID control parameters of the new strip steel.
2. 2. The method for controlling the elongation of a continuous annealing six-roller cold rolling temper mill according to claim 1, wherein in the first step, actual production data of the cold rolling production line is directly collected by a field control PLC.
3. 3. The method of controlling elongation of a continuous annealing, six-roll cold rolling temper mill according to claim 1, wherein in the second step, when the weld position of the next strip and the current strip is close to the temper mill, the distance between the weld position and the temper mill is 50m.

Description

Elongation control method of continuous annealing six-roller cold rolling temper mill Technical Field The invention relates to the field of control of production parameters of cold-rolled strip steel, in particular to an elongation control method of a continuous annealing six-roller cold-rolling temper mill. Background The elongation of the continuous annealing six-roller cold rolling temper mill is a key technological parameter of the cold-rolled strip steel, and determines the final performance of the strip steel product. The main control parameters of the flattening process are flattening rolling force and flattening front-rear tension, the main control targets of the flattening process are steel coil elongation and steel coil surface quality, and the quality of the elongation control performance is directly related to the quality of products. Because the elongation of the strip steel has the characteristics of hysteresis, mismatching with the thickness and the width of the strip steel, and the like in the production process. At present, the most widely used control strategy of conventional PID (proportion, integral and derivative) is a control strategy of conventional PID (proportion, integral and derivative), the principle is simple and the stability is good, but fixed basic parameters are usually set in advance in conventional PID control, and for offline setting of PID parameters, control research on various aspects exists in cold-rolled strip steel production: The method for accurately controlling the elongation rate of the strip steel when the welding line passes through the leveling machine is disclosed in the Chinese patent document with the application number 201310139128.1, and the elongation rate of the strip steel is rapidly and accurately controlled by adjusting the travelling speed of the strip steel before the welding line passes through the leveling machine and the rolling force after the welding line passes through the leveling machine, so that the yield rate of the strip steel is improved; the PID control parameters corresponding to different strip steel speeds are subdivided by the control method of the elongation fluctuation of the leveling machine disclosed in the Chinese patent document with the application number 201510765500.9, so that the control precision of the elongation is improved; The fuzzy PID controller based on genetic algorithm and the control method thereof disclosed in Chinese patent document with 201210521099.0 application number control the controlled object by using the fuzzy control algorithm, and generate three parameters of the PID controller according to the fuzzy principle; The control method can better meet the working condition of the initial equipment state, but the control method cannot adapt to the frequent change state of the site due to the limitation of the PID control parameter setting method, for example, when the thickness and the width of the strip steel are changed, the strip steel elongation rate cannot be better controlled, and the control method capable of automatically adjusting the strip steel elongation rate according to the strip steel with different widths and thicknesses is lacking in the prior art. Disclosure of Invention The invention aims to provide an elongation control method of a continuous annealing six-roller cold rolling temper mill, which can automatically adjust and control the elongation of strip steel according to strip steel with different specification parameters, reduce overshoot and adjustment time of the elongation control of the strip steel with different specifications, reduce the different lengths of head and tail extension and improve the yield of the strip steel. In order to achieve the above purpose, the present invention adopts the following technical scheme: The continuous annealing six-roller cold rolling temper mill elongation control method comprises the following steps: Collecting actual production data of a cold rolling production line, wherein the actual production data at least comprises strip steel thickness, strip steel width and strip steel target elongation; Monitoring tracking data of a cold rolling production line, reading thickness, width and target elongation of strip steel by utilizing a field control PLC, taking the thickness, width and target elongation of the next strip steel as input values when the weld joint position of the next strip steel and the current strip steel is close to a leveling machine, taking PID control parameters of the next strip steel as output values, and establishing a linear regression model between the input values and the output values, wherein the linear regression model is as follows: Kp＝1.58t*10-1-1.59w*10-4+4.99e*10-1, Ki＝9.98t*10-2-5.95w*10-4-1.65e*10-2, Kd＝-2.05t*10-4+4.61w*10-7+1.18e*10-4, Wherein t is the thickness of the strip steel, w is the width of the strip steel, e is the target elongation of the strip steel, and K p、Ki、Kd is the proportional, differentia