A method for obtaining a plate shape edge zone stress signal from a plate shape control system

Abstract

The application relates to a method for obtaining a strip shape edge area stress signal from a strip shape control system, wherein a strip shape edge area stress signal value corresponding to a strip width is extracted from a strip shape signal array of the strip shape control system; a subprogram in the strip shape control system reads data corresponding to the strip shape edge area stress signal in a database into a configuration file interactive buffer PIB according to a structure of the strip shape signal array, and then reads the data stored in the PIB into an AMPL environment through a database reading function module PIB_R; the PIB_R module reads strip edge area positions LZ and HZ, and then extracts operation side edge area coverage connected two area signals according to the strip edge area positions LZ and HZ respectively. The method is beneficial to obtaining the strip shape edge area stress condition.

Description

Technical Field

[0001] This invention relates to the field of aluminum rolling technology, and more specifically to a method for obtaining stress signals in the edge region of a plate shape from a plate shape control system. Background Technology

[0002] In the 1990s, SMS cold rolling mills used ABB shape rolls and ABB MasterPiece 200 automatic control PLCs for strip shape detection and control. Early aluminum processing mills lacked edge-area thermal spraying rolling oil systems and edge electromagnetic heating systems. Therefore, strip shape was affected by edge stress, leading to poor shape or strip breakage due to tight edges. To improve strip shape, an edge electromagnetic heating system was needed, requiring the acquisition of edge stress signals from the original shape control system. However, a mature method for acquiring edge stress signals is currently lacking. Summary of the Invention

[0003] The purpose of this invention is to provide a method for obtaining stress signals in the edge region of a plate shape from a plate shape control system, which is beneficial for obtaining stress conditions in the edge region of a plate shape.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a method for obtaining stress signals in the edge region of a strip from a strip shape control system, wherein the edge region stress signal value corresponding to the strip width is extracted from the strip shape signal array of the strip shape control system; the subroutine in the strip shape control system reads the data of the corresponding strip edge region stress signal from the database according to the strip shape signal array structure and puts it into the configuration file interaction buffer PIB, and then reads the data stored in the PIB into the AMPL environment through the database reading function module PIB_R; the PIB_R module reads the strip edge region positions LZ and HZ, and then extracts the signals of the two connected regions of the operation side edge coverage according to the strip edge region positions LZ and HZ respectively.

[0005] Furthermore, in the database reading function module PIB_R, C1-C10 are calling parameters, which are called according to the actual reading needs; the database name read by the database reading function module PIB_R is STTRP1B1, and it reads 1 PR type data, 2 PI type data, and 4 variable values ​​named PIB_STATUS, RLG_DIREC, LZ-NUMBER, and HZ-NUMBER respectively. Therefore, the strip edge area positions LZ and HZ are read through the PIB_R module.

[0006] Furthermore, based on the strip edge region position LZ, the method for extracting the signals of the two connected regions covered by the operation side edge is as follows: Two element variables are extracted using the array variable program function module DASM-R(2), and the function block pins are programmed:

[0007] Pin 1 (S): Function block set is running;

[0008] Pin 2 (R): Priority pin 1, resets the current output;

[0009] Pins 3 (BEG) and 4 (END): Define the elements to be extracted from the array starting at BEG and ending at END;

[0010] Pin 10 (IPR): Array signal;

[0011] Pins 7 (LPOS) and 8 (HPOS): These are located at positions 5 and 30 in array 5, respectively, for stress signals in the edge region of the production strip.

[0012] Pins 20 (OR1) and 21 (OR2): Extract two element values ​​from the array;

[0013] The strip operation side edge area is located in the 5th position of the array. The two plate shape signals of the 5th and 6th areas of the two edge areas are extracted as 11.911 and -3.983, respectively.

[0014] Furthermore, based on the strip edge region position HZ, the method for extracting the signals of the two connected regions covered by the operation side edge is as follows: Two element variables are extracted using the array variable program function module DASM-R(2), and the function block pins are programmed:

[0015] Pin 1 (S): Function block set is running;

[0016] Pin 2 (R): Priority pin 1, resets the current output;

[0017] Pins 3 (BEG) and 4 (END): Define the elements to be extracted from the array starting at BEG and ending at END;

[0018] Pin 10 (IPR): Array signal;

[0019] Pins 7 (LPOS) and 8 (HPOS): These are located at positions 5 and 30 in array 5, respectively, for stress signals in the edge region of the production strip.

[0020] Pins 20 (OR1) and 21 (OR2): Extract two element values ​​from the array;

[0021] The strip operation side area is located at the 30th position of the array. The plate shape signals of the 5th and 6th areas of the two side areas are extracted as -2.434 and 12.256, respectively.

[0022] Compared with the prior art, the present invention has the following beneficial effects: it provides a method for obtaining stress signals of the edge region of the plate shape from the plate shape control system. This method can obtain the stress situation of the edge of the plate shape, thereby providing target data for adding an edge electromagnetic heating system to the rolling mill. Attached Figure Description

[0023] Figure 1 This is a cross-sectional schematic diagram of the ABB plate roller in an embodiment of the present invention.

[0024] Figure 2 This is a schematic diagram illustrating the working principle of the pressure sensor in an embodiment of the present invention.

[0025] Figure 3 This is a block diagram illustrating the compensation principle related to plate shape in an embodiment of the present invention.

[0026] Figure 4 This is a schematic diagram of the plate shape control principle in an embodiment of the present invention.

[0027] Figure 5 This is a flowchart illustrating the method implementation of an embodiment of the present invention. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0029] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0030] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0031] 1. ABB Plate Shape Control System

[0032] The ABB shape control system mainly consists of several key components, including the shape roller, signal transmission unit (STU), electrical control cabinet, and air humidification unit. The central axis of the ABB shape roller is a steel core shaft, with four 90-degree grooves evenly distributed around it along the axial direction. Pressure sensors are placed in these four grooves. In early ABB shape rollers, the sensors were evenly spaced within the same groove, with each sensor having a 52mm axial width as a partition. Each partition was tightly fitted onto the outside of the steel core shaft with a steel ring. Figure 1 As shown, this steel ring must have sufficient strength and elastic deformation properties to better transmit the measuring force to the sensor. Each ring is measured independently, with very small gaps between them. In this embodiment, the rolling mill plate roll has a total of 34 zones.

[0033] 2. Sensor Working Principle

[0034] like Figure 2 As shown, the four sensors inside the plate roller are designed based on the principle of piezomagnetic effect. Each sensor is equivalent to a transformer, with its core made of laminated electrochemical silicon steel sheets. When AC current is applied to rings 1 and 2, an alternating induced electromotive force is induced on the secondary side of each sensor. Assuming the excitation current increases, the directions of each induced electromotive force are as shown in the figure. Since the structure of each sensor is exactly the same, e1, e2, e3, and e4 are equal in magnitude, but e1 and e3, and e2 and e4 are opposite in direction. Therefore, they cancel each other out, and there is no output voltage on the secondary side. Every two opposing sensors (180° apart along the circumference) form a pair: (1, 3), (2, 4). This not only ensures that there is no output on the secondary side when unloaded, which is convenient for recording, but also greatly reduces the interference of temperature, centrifugal force, and other noise on the output signal.

[0035] Electrically conductive silicon steel sheets (cold-rolled silicon steel sheets) exhibit a distinct magnetic directionality. When the core of a sensor is subjected to radial pressure from the strip, the coupling between its primary and secondary sides changes, causing a change in the induced electromotive force (EMF) on the secondary side of the sensor. This change is proportional to the radial pressure. For example, if e1 changes by Δe1, e2, e3, and e4 will remain unchanged; that is, e2 and e4 still cancel each other out. The voltage output from the secondary side, proportional to the radial pressure, is exactly Δe1. Thus, the radial pressure can be measured. This measured pressure is actually the component of the strip surface tension on the surface of the roll. The force and voltage values ​​we obtain have a linear relationship.

[0036] By calculating the signal difference between the measured value and the average stress in each region, the flatness of the strip surface in each region can be clearly represented.

[0037] The automatic strip shape control system pre-sets the target strip shape. During the strip rolling process, it continuously detects the actual strip shape and uses the deviation obtained by comparing the target strip shape with the actual strip shape as the basis for correcting strip shape defects. The system calculates the new output value required by the strip shape control system through an internal mathematical model and transmits this output value to the strip shape control device for closed-loop strip shape control.

[0038] 3. Automatic control system for plate shape

[0039] 3.1 Pre-setting the target curve of the plate shape

[0040] The formula for the target curve of the plate shape is:

[0041] ρ REF (x)=a0+a2x 2 +a4x 4 +a8x 8

[0042] In the formula, a0 is the zero-order coefficient (N / mm2), which makes ρ REF (x) The mean crosses zero;

[0043] a2, a4, a6—2nd, 4th, and 8th order coefficients (N / mm2);

[0044] x represents the bandwidth distance from the center of the band.

[0045] 3.2 Actual test plate shape

[0046] Calculate the actual tensile stress of the strip in each section of the plate roll:

[0047] Plate shape represented by tension difference: ρ i =T0-T i

[0048] i = 1, 2, ..., N are the sensor area codes, T i This represents the tensile stress of the strip corresponding to the first sensing zone.

[0049] ρ i Computational model:

[0050] In the formula: P i —Radial pressure in measurement zone i;

[0051] —Average of all pressures;

[0052] T—Total strip tension;

[0053] —Average tensile stress.

[0054] 3.3 Compensation for measuring plate shape

[0055] like Figure 3 As shown, the actual plate shape tension stress detected by the plate shape roller is used to obtain the plate shape deviation signal after compensation and target curve calculation. That is, the effective plate shape deviation array of each of the 34 zones can be expressed by the following formula:

[0056] Δσ=(Δσ1Δσ2Δσ3…Δσ 33 Δσ 34 )

[0057] 3.4 Plate Shape Control Principle Diagram

[0058] The shape control system calculates the adjustment amount of each control method according to the least squares method strategy for the shape deviation. The shape is adjusted by mechanical drives such as bending rolls, tilting rolls, and CVC movement of intermediate rolls, and the remaining shape deviation is adjusted by multi-zone cooling rolls. The control principle diagram is shown in Figure 4.

[0059] As can be seen from the above analysis, plate shape signal data processing involves analyzing, calculating and monitoring the array of stress signals from each zone. To do this, it is necessary to extract the stress signal value of the edge zone corresponding to the strip width from the plate shape signal array, and then transmit the stress deviation signal to the electromagnetic heating system for analysis and processing.

[0060] Therefore, as Figure 5 As shown, this embodiment provides a method for obtaining edge region stress signals from a strip shape control system. The method extracts the edge region stress signal value corresponding to the strip width from the strip shape signal array of the strip shape control system. In the strip shape control system, a subroutine reads the corresponding edge region stress signal data from the database into the configuration file interaction buffer PIB according to the strip shape signal array structure. Then, the database reading module PIB_R reads the data stored in the PIB into the AMPL environment. The PIB_R module reads the strip edge region positions LZ and HZ, and then extracts the signals of the two connected regions covering the edge on the operation side based on the strip edge region positions LZ and HZ, thereby obtaining the edge region stress signal value corresponding to the strip width.

[0061] PC1-PCn are the subroutines in the strip shape control system. Each subroutine can read and write to the database, and exchange and communicate data with other subroutines. The elements of the strip shape signal array can be real numbers, integers, etc. Among them, the Zonevalue for position g1 to Zonevalue for pos.zmax in the array, which are determined by LPOS and HPOS related to the strip width, are valid signal values ​​covering the measurement area of ​​the strip width.

[0062] The database reading module PIB_R is used to read data stored in the PIB (Profile Interaction Buffer) into the AMPL environment. C1-C10 are the calling parameters, invoked according to actual reading needs. The database name read by the PIB_R module is STTRP1B1. It reads one PR type data, two PI type data, and four variable values ​​named PIB_STATUS, RLG_DIREC, LZ-NUMBER, and HZ-NUMBER respectively. Therefore, the LZ and HZ positions of the strip edge area are read through the PIB_R module.

[0063] Based on the strip edge region location LZ, the signals of the two connected regions covered by the operating side edge can be extracted:

[0064] The program function module DASM-R(2) extracts two element variables from an array variable, and the function block pins are programmed as follows:

[0065] Pin 1 (S): Function block set is running;

[0066] Pin 2 (R): Priority pin 1, resets the current output;

[0067] Pins 3 (BEG) and 4 (END): Define the elements to be extracted from BEG to END of the array (because two values ​​are needed: END = BEG + 1);

[0068] Pin 10 (IPR): Array signal;

[0069] Pins 7 (LPOS) and 8 (HPOS): These are located at positions 5 and 30 in array 5, respectively, for stress signals in the edge region of the production strip.

[0070] Pins 20 (OR1) and 21 (OR2): Extract two element values ​​from the array;

[0071] The strip operation side edge area is located in the 5th position of the array. The two plate shape signals of the 5th and 6th areas of the two edge areas are extracted as 11.911 and -3.983, respectively.

[0072] Based on the position HZ of the strip edge region, the signals of the two connected regions covering the operating side edge can be extracted:

[0073] The program function module DASM-R(2) extracts two element variables from an array variable, and the function block pins are programmed as follows:

[0074] Pin 1 (S): Function block set is running;

[0075] Pin 2 (R): Priority pin 1, resets the current output;

[0076] Pins 3 (BEG) and 4 (END): Define the elements to be extracted from BEG to END (because two values ​​are needed: BEG = END - 1);

[0077] Pin 10 (IPR): Array signal;

[0078] Pins 7 (LPOS) and 8 (HPOS): These are located at positions 5 and 30 in array 5, respectively, for stress signals in the edge region of the production strip.

[0079] Pins 20 (OR1) and 21 (OR2): Extract two element values ​​from the array;

[0080] The strip operation side area is located at the 30th position of the array. The plate shape signals of the 5th and 6th areas of the two side areas are extracted as -2.434 and 12.256, respectively.

[0081] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A method of obtaining a plate shape edge zone stress signal from a plate shape control system, characterized by, The strip width corresponding edge area stress signal value is extracted from the plate shape signal array of the plate shape control system; the subprogram in the plate shape control system reads the data of the plate shape edge area stress signal in the database to the configuration file interactive buffer PIB according to the plate shape signal array structure, and then reads the data stored in the PIB to the AMPL environment through the database reading function module PIB_R; the PIB_R module reads the strip edge area position LZ and HZ, and then extracts the operation side edge coverage connected two area signals according to the strip edge area position LZ and HZ respectively; In the database reading function module PIB_R, C1-C10 are call parameters, which are called according to actual reading needs; the database name read by the database reading function module PIB_R is STTRP1B1, 1 PR type data, 2 PI type data and 4 variable values with names PIB_STATUS, RLG_DIREC, LZ-NUMBER and HZ-NUMBER are read, therefore, the strip edge area positions LZ and HZ are read through the PIB_R module; The method for extracting the operation side edge coverage connected two area signals according to the strip edge area position LZ is that the array variable extraction two element variable program function module DASM-R(2) is used to program the function block pins as follows: Pin 1 (S): function block set runs; Pin 2 (R): priority pin 1, reset current output; Pins 3 (BEG) and 4 (END): define array element extraction from BEG to END; Pin 10 (IPR): array signal; Pins 7 (LPOS) and 8 (HPOS): for producing strip edge area stress signals at array positions 5 and 30 respectively; Pins 20 (OR1) and 21 (OR2): extract two element values from the array; The strip operation side edge area is at the 5th position of the array, and the two area plate shape signals of the 5th and 6th edge areas are 11.911 and -3.983 respectively; The method for extracting the operation side edge coverage connected two area signals according to the strip edge area position HZ is that the array variable extraction two element variable program function module DASM-R(2) is used to program the function block pins as follows: Pin 1 (S): function block set runs; Pin 2 (R): priority pin 1, reset current output; Pins 3 (BEG) and 4 (END): define array element extraction from BEG to END; Pin 10 (IPR): array signal; Pins 7 (LPOS) and 8 (HPOS): for producing strip edge area stress signals at array positions 5 and 30 respectively; Pins 20 (OR1) and 21 (OR2): extract two element values from the array; The strip operation side edge area is at the 30th position of the array, and the two area plate shape signals of the 5th and 6th edge areas are -2.434 and 12.256 respectively.

Images