A method and system for automatically adjusting the plate shape of a hot rolling finishing mill

Abstract

The present invention belongs to the technical field of hot-rolled plate and strip production in the metallurgical industry, and particularly relates to a method and system for automatic adjustment of the plate shape of a hot rolling finishing mill. The method comprises: calibrating the side guides of the finishing mill; setting the opening degree of the calibrated side guides; and adjusting the roll gap of the upstream stand according to the magnetic scale count of the side guides of the finishing mill when the strip deviates. The system comprises: a calibration module, a setting module, and an adjustment module; the calibration module is used to calibrate the side guides of the finishing mill; the setting module is used to set the opening degree of the calibrated side guides; and the adjustment module is used to adjust the roll gap of the upstream stand according to the magnetic scale count of the side guides of the finishing mill when the strip deviates. The present invention calibrates the side guides, then sets the opening degree of the calibrated side guides, and finally adjusts the size of the roll gap according to the deformation of the strip shape. This can effectively improve the plate shape control accuracy of the finishing rolling process, improve the finishing plate shape, and enhance the automation and intelligence level of the rolling line.

Description

Technical Field

[0001] The present invention belongs to the technical field of hot-rolled plate and strip steel production in the metallurgical industry, and in particular relates to a method and system for automatically adjusting the plate shape of a hot continuous rolling finishing mill. Background Art

[0002] The automation and intelligentization of hot rolling production processes are a hot topic in the industry. Through continuous development, technologies such as automated steel loading, automated steel burning, and automated steel tapping in heating furnaces, as well as automated roll changing for finishing mills, are maturing, gradually improving the automation and intelligentization of hot rolling lines. Regarding the core technology for controlling flatness during the rolling process, the current mainstream approach uses high-speed cameras to detect flatness changes and adjust the mill roll gap based on these changes, achieving automatic flatness adjustment. This control method is currently only mastered by companies such as SMS and Beijing University of Science and Technology, and is relatively expensive to implement.

[0003] During the finishing rolling process, the plate shape is mainly adjusted by the operator by observing the exit shape of each strip stand. However, due to the thicker strip thickness of the front stand, the plate shape change is not easy to observe. If there is a deviation in the adjustment, the strip will have potential poor plate shape. In recent years, with the gradual improvement of the "hot instead of cold" process, the market demand for thin-gauge products has increased. When rolling thin gauges, the overall rolling speed is relatively fast, and the potential poor plate shape of the front stand will be sharply amplified in the rear stand. In severe cases, it will directly lead to rolled steel or even scrap, seriously affecting the stability of rolling. At the same time, it does not meet the company's high-quality development needs. Therefore, measures need to be taken to control the potential poor plate shape of the front stand and ensure the stability of thin-gauge production by improving the flatness of the front stand.

[0004] After searching, the announcement number CN112139259B discloses a method for automatically correcting the deviation of the finishing strip, which includes: 1) installing a pressure detection device on both sides of each small vertical roller at the front end of the finishing mill to detect the rolling force deviation value on both sides of each small vertical roller; 2) presetting the upper and lower limits of the rolling force deviation value on both sides of the roll gap according to the process operation conditions; 3) detecting the actual rolling force on both sides of the finishing small vertical roller; 4) calculating the rolling force deviation value on both sides of each finishing small vertical roller; 5) judging whether the rolling force deviation value on both sides of each finishing small vertical roller is within the range of 0.01 to 0.01. If it is within the control dead zone, then end the automatic deviation correction and return to the previous step; if not, proceed to the next step; 6) calculate the roll gap deviation adjustment amount or the finishing roll deviation compensation amount of each stand to control the deviation; 7) determine whether the roll gap deviation adjustment amount exceeds the limit, if so, adjust the roll gap deviation according to the preset upper and lower limits of the rolling force deviation value on both sides of the roll gap; if not, proceed to the next step; 8) adjust the roll gap deviation according to the actual calculated roll gap deviation; 9) end this round of control, return to step 3), and perform the next round of detection and control process in sequence. The above content realizes automatic plate shape adjustment by performing pressure detection on the small vertical roller before finishing rolling and adjusting the finishing mill roll gap according to the detection results. However, the pressure change of the small vertical roller depends not only on the change of the finish-rolled plate shape, but also on the shape of the rough-rolled incoming material. When the incoming material shape is poor, it will also cause the pressure deviation on both sides of the vertical roller to exceed the limit. Therefore, there may be an adjustment deviation in the actual process. The present invention uses the side guide action of the downstream frame as the adjustment basis to adjust the roll gap inclination of the upstream frame, directly avoiding the wrong adjustment caused by the rough-rolled plate shape.

[0005] After searching, the announcement number CN110834033B discloses an automatic strip deviation correction control method for a hot-rolled finishing mill, which includes the following steps: step 1, setting a strip deviation detection device between two adjacent frames of the hot-rolled finishing mill; step 2, the strip deviation detection device detects the strip deviation value △w; step 3, calculating the roll gap deviation value △G that needs to be adjusted for the downstream frame based on the strip deviation value △w; step 4, calculating the time T for the strip to travel from the detection device to the downstream frame; step 5, the frame roll gap control system delays T time, and adjusts the roll gap of the downstream frame according to the roll gap deviation value △G; step 6, the strip deviation detection device detects the strip deviation value △w at the strip deviation detection device, and returns to execute step 3 until the downstream frame throws the strip; after the downstream frame throws the strip, the roll gap deviation △G of the downstream frame is cleared. The above content realizes automatic adjustment of strip shape by adding a deviation detection device, determining the amount of strip deviation through the detection device, and adjusting the roller gap of the finishing mill based on the deviation feedback. Compared with this patent, the above patent realizes automatic control of finishing strip shape by adding a detection system and optimizing the adjustment system, which requires equipment modification. The patent of this invention directly realizes automatic control of finishing strip shape based on the existing equipment functions.

[0006] In order to solve the above problems, it is necessary to design a method and system for automatically adjusting the plate shape of a hot rolling finishing mill. Summary of the Invention

[0007] In view of the above problems, the present invention provides a method for automatically adjusting the plate shape of a hot rolling finishing mill, the method comprising:

[0008] Calibrate the side guides of the finishing mill;

[0009] Set the opening degree of the calibrated side guide plate;

[0010] Adjust the upstream stand roll gap according to the magnetic scale count of the side guide of the finishing mill when the strip deviates.

[0011] Preferably, the side guide plate consists of an operating side guide plate and a transmission side guide plate;

[0012] The side guides are driven by hydraulic cylinders;

[0013] The magnetic scale is located in the hydraulic cylinder.

[0014] Preferably, the calibrating the side guide plates of the finishing mill includes:

[0015] The centering deviation of the operating side guide plate and the transmission side guide plate of the finishing mill is controlled within 2mm.

[0016] Preferably, setting the opening degree of the calibrated side guide plate includes:

[0017] Adjust the opening of the side guide plates of the finishing mill according to the width of the strip.

[0018] Preferably, adjusting the roll gap inclination of the upstream stand according to the magnetic scale count of the side guide plate of the finishing mill when the strip deviates includes:

[0019] When the change in the magnetic scale count of the side guide plate is ≥3mm and the strip deviation duration is ≥2s, the roll gap tilt of the upstream stand will be automatically adjusted;

[0020] When the side guide plate magnetic scale count value is less than 3mm or the strip deviation duration is less than 2s, the upstream frame roll gap tilt does not operate.

[0021] Preferably, the calculation formula for the adjustment amount for automatically adjusting the upstream stand roll gap inclination is:

[0022] Y=-0.001083+0.0097*X-0.000241*X 2 ;

[0023] Among them, Y represents the adjustment amount, X represents the current rack outlet strip thickness, and the value range of X is 1.8 to 25.4 mm.

[0024] The present invention also provides a system for automatically adjusting the plate shape of a hot rolling finishing mill, the system comprising: a calibration module, a setting module and an adjustment module;

[0025] The calibration module is used to calibrate the side guides of the finishing mill;

[0026] The setting module is used to set the opening degree of the calibrated side guide plate;

[0027] The adjustment module is used to adjust the upstream stand roll gap according to the magnetic scale count of the side guide plate of the finishing mill when the strip deviates.

[0028] Preferably, the calibration module is used to calibrate the side guides of the finishing mill, including:

[0029] The calibration module is used to control the centering deviation of the operating side guide plate and the transmission side guide plate of the finishing mill within a range of 2 mm.

[0030] Preferably, the setting module is used to set the opening degree of the calibrated side guide plate, including:

[0031] The setting module is used to adjust the opening degree of the side guide plates of the finishing mill according to the width of the strip.

[0032] Preferably, the adjustment module is used to adjust the upstream stand roll gap according to the magnetic scale count of the side guide plate of the finishing mill when the strip deviates, and includes:

[0033] In the adjustment module, when the side guide plate magnetic scale count change value is ≥3mm and the strip deviation duration is ≥2s, the upstream stand roll gap tilt is automatically adjusted;

[0034] In the adjustment module, when the side guide plate magnetic scale count value is less than 3mm or the strip deviation duration is less than 2s, the upstream frame roll gap tilt does not operate.

[0035] The present invention has the following beneficial effects:

[0036] The present invention calibrates the side guide plates, sets the opening degree of the calibrated side guide plates, and finally adjusts the size of the roll gap according to the deformation of the strip shape. This can effectively improve the plate shape control accuracy of the finishing rolling process, improve the finishing plate shape, and enhance the automation and intelligence level of the rolling line to meet the high-quality development needs of steel enterprises.

[0037] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0039] Figure 1 A flow chart of a method for automatically adjusting the plate shape of a hot rolling finishing mill according to an embodiment of the present invention is shown;

[0040] Figure 2 A detailed flow chart of adjusting the roll gap of a stand according to strip steel in an embodiment of the present invention is shown;

[0041] Figure 3 A system diagram of automatic plate shape adjustment for a hot rolling finishing mill according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0042] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0043] like Figure 1 As shown, the present invention proposes a method for automatically adjusting the plate shape of a hot rolling finishing mill, the method comprising: calibrating the side guide plates of the finishing mill, the side guide plates consisting of an operating side guide plate and a transmission side guide plate; setting the opening degree of the calibrated side guide plates, the side guide plates being driven by a hydraulic cylinder; adjusting the upstream stand roll gap according to the magnetic scale count of the side guide plates of the finishing mill when the strip deviates, the magnetic scale being located in the hydraulic cylinder.

[0044] The calibration of the side guides of the finishing mill includes: controlling the centering deviation of the operating side guides and the transmission side guides of the finishing mill within a range of 2mm. The setting of the opening degree of the calibrated side guides includes: adjusting the opening degree of the side guides of the finishing mill according to the width of the strip. Adjusting the inclination of the upstream stand roll gap according to the magnetic scale count of the side guides of the finishing mill when the strip deviates includes: automatically adjusting the inclination of the upstream stand roll gap when the side guide magnetic scale count change value is ≥3mm and the strip deviation duration is ≥2s; when the side guide magnetic scale count value is <3mm or the strip deviation duration is <2s, the upstream stand roll gap inclination does not operate. The calibration of the side guides of the finishing mill includes: controlling the centering deviation of the operating side guides and the transmission side guides within a range of 2mm.

[0045] The calculation formula for the automatic tilt adjustment is: Y = -0.001083 + 0.0097*X - 0.000241*X; where Y represents the adjustment amount and X represents the strip thickness at the current rack outlet. The value range of X is 1.8 to 25.4 mm. In this embodiment, the racks F1 to F4 are used. When adjusting the racks, the upper limit of adjustment for F1 is 0.2 mm, the upper limit of adjustment for F2 is 0.15 mm, the upper limit of adjustment for F3 is 0.10 mm, and the upper limit of adjustment for F4 is 0.10 mm. Each piece of steel can be adjusted up to three times per rack.

[0046] like Figure 2 As shown, the upstream stand roll gap is adjusted according to the magnetic scale count of the side guide of the finishing mill when the strip deviates. When the change value of the magnetic scale count of the side guide is ≥3mm and the strip deviates for ≥2s, the transmission side is opened to increase the roll gap inclination of the upstream stand or the operation side is opened to reduce the roll gap of the upstream stand. The side guide of the finishing mill is then tested again. When the magnetic scale count value of the side guide is less than 3mm or the strip deviates for less than 2s, the strip enters the downstream stand normally.

[0047] like Figure 3 As shown, the present invention also proposes a system for automatically adjusting the plate shape of a hot rolling finishing mill, the system comprising: a calibration module, a setting module and an adjustment module; the calibration module is used to calibrate the side guide plates of the finishing mill; the setting module is used to set the opening degree of the calibrated side guide plates; the adjustment module is used to adjust the upstream stand roll gap according to the magnetic scale count of the side guide plates of the finishing mill when the strip deviates.

[0048] The calibration module is used to calibrate the side guides of the finishing mill, including: the calibration module is used to control the centering deviation of the operating side guides and the transmission side guides of the finishing mill within a range of 2mm. The setting module is used to set the opening degree of the calibrated side guides, including: the setting module is used to adjust the opening degree of the side guides of the finishing mill according to the width of the strip. The adjustment module is used to adjust the upstream stand roll gap based on the magnetic scale count of the side guides of the finishing mill when the strip deviates, including: in the adjustment module, when the change value of the magnetic scale count of the side guides is ≥3mm and the duration of the strip deviation is ≥2s, the upstream stand roll gap inclination is automatically adjusted; in the adjustment module, when the magnetic scale count value of the side guides is <3mm or the duration of the strip deviation is <2s, the upstream stand roll gap inclination is not actuated.

[0049] Those skilled in the art should understand that although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible to modify the technical solutions described in the aforementioned embodiments, or to make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for automatically adjusting the plate shape of a hot rolling finishing mill, characterized in that: The method comprises: Calibrate the side guides of the finishing mill; the side guides are composed of an operating side guide and a transmission side guide; the side guides are driven by a hydraulic cylinder; the magnetic scale of the side guides is located within the hydraulic cylinder; calibrating the side guides of the finishing mill includes: controlling the centering deviation of the operating side guide and the transmission side guide of the finishing mill within a range of 2 mm; Set the opening degree of the calibrated side guide plate; The upstream stand roll gap is adjusted according to the side guide magnetic scale count of the finishing mill when the strip deviates; the adjustment includes: when the side guide magnetic scale count change value is ≥3mm and the strip deviates for a duration of ≥2s, the upstream stand roll gap tilt is automatically adjusted; when the side guide magnetic scale count value is <3mm or the strip deviates for a duration of <2s, the upstream stand roll gap tilt is not actuated; the calculation formula for the adjustment amount of the upstream stand roll gap tilt is: Where Y represents the adjustment amount, X represents the current rack outlet strip thickness, and the value range of X is 1.8~25.4mm.

2. The method for automatically adjusting the plate shape of a hot rolling finishing mill according to claim 1, characterized in that: The setting of the opening degree of the calibrated side guide plate includes: Adjust the opening of the side guide plates of the finishing mill according to the width of the strip.

3. A system for automatic adjustment of plate shape of hot rolling finishing mill, characterized in that: The system includes: a calibration module, a setting module and an adjustment module; The calibration module is used to calibrate the side guides of the finishing mill; including: the calibration module is used to control the centering deviation of the operating side guide and the transmission side guide of the finishing mill within a range of 2mm; The setting module is used to set the opening degree of the calibrated side guide plate; The adjustment module is used to adjust the upstream stand roll gap according to the side guide magnetic scale count of the finishing mill when the strip deviates; including: in the adjustment module, when the side guide magnetic scale count change value is ≥3mm and the strip deviates for a duration of ≥2s, the upstream stand roll gap tilt is automatically adjusted; in the adjustment module, when the side guide magnetic scale count value is <3mm or the strip deviates for a duration of <2s, the upstream stand roll gap tilt is not actuated; the calculation formula for the adjustment amount of the automatic adjustment of the upstream stand roll gap tilt is: Where Y represents the adjustment amount, X represents the current rack outlet strip thickness, and the value range of X is 1.8~25.4mm.

4. The system for automatic adjustment of plate shape of hot rolling finishing mill according to claim 3, characterized in that: The setting module is used to set the opening degree of the calibrated side guide plate, including: The setting module is used to adjust the opening degree of the side guide plates of the finishing mill according to the width of the strip.

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