CN-117718361-B - Control method of acid pickling line withdrawal and straightening machine

CN117718361BCN 117718361 BCN117718361 BCN 117718361BCN-117718361-B

Abstract

The invention discloses a control method of a tension leveler of an acid washing production line, which comprises the steps of firstly monitoring, tracking and recording actual production line production data, screening the data according to field signals at the tail part of strip steel, predicting a linear regression algorithm of specific tension leveler parameters based on strip steel thickness, width and steel grade data, calculating the tension leveler parameters meeting the requirement of the next strip steel, after the next strip steel enters an uncoiler, issuing the calculated tension leveler parameters meeting the next strip steel to a field control PLC, and switching the control parameters in the PLC into technological parameters meeting the next strip steel and executing when the head end weld position of the next strip steel reaches the tension leveler. The invention realizes full-automatic parameter setting, reduces the workload of operators, reduces the incidence rate of the defects of the withdrawal and straightening plate type and effectively ensures the quality of products through reasonable parameter setting of the extensibility, the bending roller insertion depth 1, the bending roller insertion depth 2 and the straightening roller insertion depth.

Inventors

YANG HAO
HUANG RONGLIN
LI TUJIN
SU WEIQIANG

Assignees

宝钢湛江钢铁有限公司

Dates

Publication Date: 20260512
Application Date: 20240102

Claims (3)

1. The control method of the acid pickling line withdrawal and straightening machine is characterized by comprising the following steps of: (1) A PLC connected to a withdrawal and straightening machine by an upper computer server is used for reading the technological parameters of ID numbers of the current coiled strip steel, wherein the technological parameters comprise the thickness, width, steel grade, actual elongation, bending roller insertion depth 1, bending roller insertion depth 2 and straightening roller insertion depth of the strip steel; (2) Recording and storing related process parameters in an upper computer at intervals of one second; (3) Screening the recorded technological parameters after the tail part of the strip steel passes through a withdrawal and straightening machine, observing to find that the shape of the coiled steel is good, giving a recording signal at the moment, calculating the average value of all data in the length direction at the moment, and finishing the selected data into a data sample for training a linear model; (4) Adding a newly recorded data sample into a previously stored sample, and training a process parameter linear regression model according to the newly recorded data sample, wherein the input parameters of the model comprise the thickness, the width and the steel grade of strip steel, and the output parameters of the model are the target elongation, the bending roller insertion depth 1, the bending roller insertion depth 2 and the straightening roller insertion depth; (5) When the next coiled steel is produced, monitoring and correcting production line tracking data, after the next coiled steel enters an uncoiler, calculating corresponding technological parameters according to the linear model trained in the step (4) on an upper computer process server, and issuing the technological parameters to a PLC (programmable logic controller) to wait for execution; (6) Before the next coiled steel reaches the inlet of the tension leveler, switching the execution process parameters of the tension leveler into the process parameters which are issued to the PLC in the step (5), and executing; (7) And (3) jumping to the step (2) to start a sample collection and training process of a new period.
2. The method of claim 1, wherein in the step (4), 60 different steel grades are used in the field, each steel grade is represented by a number, and the number is from 1 to 60.
3. The method of claim 1, wherein in the step (6), the process parameters are switched when the position of the weld at the head end of the next strip is 5m from the inlet of the leveler.

Description

Control method of acid pickling line withdrawal and straightening machine Technical Field The invention belongs to the technical field of pickling, and particularly relates to a control method of process parameters of a withdrawal and straightening machine in a cold rolling pickling production line. Background The withdrawal and straightening machine is positioned in front of the pickling section and is used for withdrawing and straightening hot rolled strip steel, breaking scales of the strip steel, ensuring that the strip steel can be sufficiently pickled, and playing a decisive role in the pickling effect. The mechanical part of the tension leveler comprises a tension leveler host and front and back tension rollers, which are manufactured by Xiangyang Boya fine engineering. The stretching and straightening machine applies bending stress to the strip steel, the front tension roller and the rear tension roller apply tensile stress to the strip steel (the front tension roller and the rear tension roller can form controllable speed difference), and the strip steel can moderately extend under the condition that the tensile stress applied to the strip steel is far lower than the yield limit of the material under the cooperation of the two stresses. On the one hand, the extension can improve the shape of the strip, eliminate the defects of wave shape, buckling, camber and the like of the strip, and meanwhile, eliminate the yield platform, improve the mechanical property of the strip, and on the other hand, the oxidation layer on the surface of the strip is greatly different from the iron matrix in performance, so that the oxidation layer is greatly separated under the bending and stretching actions of the strip, and the oxidation layer still attached to the surface of the strip can generate cracks, thereby improving the pickling and descaling efficiency of the acid tank. Therefore, the withdrawal and straightening machine and the acid tank are matched to work, and the descaling effect can be ensured. The control of the withdrawal and straightening machine by most of the steel factories in China cannot be effectively mastered, and has some problems aiming at the control of the withdrawal and straightening machine, for example, patent application number CN200710042975.0 discloses a withdrawal and straightening machine control method which mainly controls the withdrawal and straightening machine by setting the deviation conditions of front and rear strip steel and the control modes of the withdrawal and straightening machine corresponding to the deviation conditions, but the invention has great limitation on applicability, and particularly has great error on the control of special technological parameter conditions. As another example, patent application number CN201610857948.8 discloses a control method of a withdrawal and straightening machine of an acid rolling mill, which mainly sets different parameters of the withdrawal and straightening machine according to the yield strength level of a target steel grade, so as to realize graded control of the withdrawal and straightening parameters. However, this method has a problem in accuracy and is complicated to operate. At present, the problems in the control of the tension leveler mainly include the following two items: (1) The parameters of the stretching elongation and the insertion depth of the stretching roller are not reasonably set. Defects such as waist folds, roll marks, indentation and the like are easy to occur in the production process. The personnel intervention is more in the production process, the production rhythm is seriously influenced, the shutdown of a process section is easy to cause, the parking spots are generated, and the component yield of the machine is influenced. (2) The drawing and straightening process aiming at the hot forming steel is unreasonable, and the drawing and straightening elongation rate of the hot forming steel is unreasonable, so that the steel plate shape cannot be effectively controlled, the control effect of the hot forming steel is poor, microcracks are easily generated on the surface during drawing and straightening, and the macular defect exists. Disclosure of Invention The invention aims to provide a control method of a tension leveler of an acid pickling line, which has high precision, high speed and easy operation. In order to achieve the technical aim, the invention adopts the following technical scheme that the control method of the tension leveler of the pickling line is characterized by comprising the following steps: (1) A PLC connected to a withdrawal and straightening machine by an upper computer server is used for reading the technological parameters of ID numbers of the current coiled strip steel, wherein the technological parameters comprise the thickness, width, steel grade, actual elongation, bending roller insertion depth 1, bending roller insertion depth 2 and straightening roller insertion depth of