A method and system for controlling the cross-sectional shape of hot rolled strip

Abstract

The present application relates to a kind of hot-rolled strip section shape control method and system, comprising: collecting strip crown data;Based on the strip crown data, draw strip width profile;Through strip width profile, identify and position the hot-rolled plate shape defect of strip surface;According to the positioning result, eliminate hot-rolled plate shape defect.The present application identifies and positions the hot-rolled plate shape defect of strip surface by drawing strip width profile, effectively solves the problem of strip rib, edge wave and wedge too large, greatly improves the quality of raw material base plate.

Description

Technical Field

[0001] This invention relates to the field of rolling processing technology, and specifically to a method and system for controlling the cross-sectional shape of hot-rolled strip steel. Background Technology

[0002] As the core raw material substrate for cold-rolled deep-processed products, the surface shape quality of hot-rolled strip steel directly determines the final quality of cold-rolled products. In actual production, hot-rolled strip steel is prone to surface and cross-sectional shape defects such as "ribs," "transverse bends," and "transverse bend edge waviness." These defects directly affect subsequent coating processes such as galvanizing and silicon steel plating, seriously impacting the finished product's shape and appearance quality.

[0003] Especially for high-end products such as silicon steel, the aforementioned defects can easily lead to excessive differences between products on the same sheet, significantly reducing the stacking rate for users, triggering batch quality disputes and downgrading of end products, causing huge economic losses and damaging the company's brand image. With the increasing proportion of thin-gauge rolling on hot-rolled production lines, defects such as tailing and roll marks caused by excessively large wedges are becoming more frequent. Traditional control methods are no longer sufficient to meet the stringent requirements of high-end customers for substrate quality. Therefore, there is an urgent need for a control technology that can precisely intervene and effectively improve the symmetry of the cross-sectional shape of hot-rolled strip steel. Summary of the Invention

[0004] To address the aforementioned problems, the purpose of this invention is to provide a method and system for controlling the cross-sectional shape of hot-rolled strip steel.

[0005] A method for controlling the cross-sectional shape of hot-rolled strip steel includes:

[0006] Step 1: Collect strip crown data;

[0007] Step 2: Draw a strip width profile based on the strip crown data;

[0008] Step 3: Identify and locate hot-rolled sheet shape defects on the strip surface using the strip width profile diagram;

[0009] Step 4: Eliminate hot-rolled plate shape defects based on the positioning results.

[0010] Preferably, step 4 includes: adjusting the lateral displacement of the vertical roll according to the positioning result, and simultaneously adjusting the rolling leveling value to establish a centering state. In the centering state, the deformation uniformity in the width direction of the strip is monitored in real time, and the strip crown symmetry is ensured by dynamically adjusting the rolling force distribution to eliminate hot-rolled plate shape defects.

[0011] Preferably, step 4 further includes: when the single-sided wedge value is detected to exceed a preset threshold, immediately triggering the vertical roll lateral movement compensation mechanism to adjust the strip center axis to coincide with the rolling center line.

[0012] Preferably, step 4 further includes: analyzing tension fluctuation data during the rolling process, and adjusting the vertical roll opening in advance to suppress roll marks when the tension fluctuation data exceeds the set range.

[0013] A hot-rolled strip cross-sectional shape control system, comprising:

[0014] The data acquisition module is used to collect strip crown data;

[0015] The profile drawing module is used to draw the profile of the strip width based on the strip crown data;

[0016] The defect identification module is used to identify and locate hot-rolled sheet shape defects on the surface of the strip by means of the strip width profile diagram;

[0017] A closed-loop control module is used to eliminate hot-rolled sheet shape defects based on the positioning results.

[0018] The present invention also provides an electronic device, including a bus, a transceiver, a memory, a processor, and a computer program stored in the memory and executable on the processor. The transceiver, the memory, and the processor are connected via the bus. When the computer program is executed by the processor, it implements the steps in the above-described method for controlling the cross-sectional shape of hot-rolled strip steel.

[0019] The present invention also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps in the above-described method for controlling the cross-sectional shape of hot-rolled strip steel.

[0020] According to specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0021] This invention relates to a method and system for controlling the cross-sectional shape of hot-rolled strip steel. Compared with the prior art, this invention identifies and locates hot-rolled strip shape defects on the surface of the strip steel by drawing a strip width profile diagram, effectively solving the problems of strip steel ribs, edge waviness, and excessive wedge shape, and greatly improving the quality of the raw material substrate.

[0022] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of a method for controlling the cross-sectional shape of hot-rolled strip steel provided by the present invention. Detailed Implementation

[0025] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0027] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0028] Please see Figure 1 A method for controlling the cross-sectional shape of hot-rolled strip steel, comprising:

[0029] Step 1: Collect strip crown data;

[0030] Step 2: Draw a strip width profile based on the strip crown data;

[0031] Step 3: Identify and locate hot-rolled sheet shape defects on the strip surface using the strip width profile diagram;

[0032] Step 4: Eliminate hot-rolled plate shape defects based on the positioning results.

[0033] Step 4 includes: adjusting the vertical roll lateral movement based on the positioning result, adjusting the rolling leveling value at the same time, establishing a centering state, and monitoring the deformation uniformity of the strip width direction in real time in the centering state. By dynamically adjusting the rolling force distribution, the symmetry of the strip crown is ensured to eliminate hot-rolled plate shape defects.

[0034] Step 4 also includes: when the detected unilateral wedge value exceeds a preset threshold, immediately triggering the vertical roll lateral movement compensation mechanism to adjust the strip center axis to coincide with the rolling center line. Analyzing tension fluctuation data during the rolling process, when the tension fluctuation data exceeds the set range, adjusting the vertical roll opening in advance to suppress roll marks.

[0035] In one embodiment of the present invention, strip crown data fed back from the hot-rolled finishing zone measurement room is collected in real time, and a strip width profile is drawn based on the crown data; the profile is used to intelligently identify and locate the "rib" position and edge fluctuation area on the strip surface.

[0036] Based on the positioning results, adjust the lateral displacement of the vertical rolls and simultaneously adjust the rolling leveling value to establish a centering rolling control system. Based on the centering status, monitor the deformation uniformity in the strip width direction in real time, and ensure the symmetry of strip crown by dynamically adjusting the rolling force distribution to eliminate defects such as "ribs" and "lateral folds".

[0037] Furthermore, when the wedge value on one side exceeds a preset threshold, the vertical roll lateral movement compensation mechanism is immediately triggered, forcing the strip's central axis to coincide with the rolling centerline. By analyzing tension fluctuation data during the rolling process, the risk of tailing caused by excessive wedge shape is predicted, and the vertical roll opening is optimized in advance to suppress roll marks.

[0038] This embodiment takes the production of hot-rolled raw material substrate for silicon steel with a thickness of 0.35mm and a grade of 35W440 as an example. The original billet specifications are hot-rolled strip steel with a thickness of 2.0mm and a width of 1200mm.

[0039] 1. Acquisition Phase (Defect Characterization):

[0040] The measurement room transmits real-time convexity data of this batch of strip steel and plots its width profile. Data analysis reveals:

[0041] Rib defects: Continuous protrusions (ribs) with a height of 0.08mm-0.12mm appear at a distance of about 100mm-150mm in the width direction of the strip, with a peak convexity (Cp) of 8.0μm.

[0042] Edge wedge: The wedge value on the right edge exceeds the standard, with a measured value of 0.05 mm / m, which far exceeds the internal control standard of ≤0.02 mm / m for silicon steel raw materials.

[0043] Surface roughness: The Ra value fluctuates greatly in some areas, with a maximum value of 3.2 μm, which poses a risk of coating defects.

[0044] 2. Intervention Phase (Parameter Adjustment):

[0045] The control module determines that the strip alignment deviation is large under this condition, and immediately sends a command to the vertical roll pressing device to execute the following adjustment parameters:

[0046] Lateral shift of vertical roller: Increase the lateral shift of the left vertical roller by 5mm to compensate for the centering error.

[0047] Rolling leveling: Simultaneously adjust the rolling leveling value to shift the rolling center line 3mm to the left.

[0048] Rolling force distribution: Adjust the rolling force of the finishing mill last stand (F7) from the original 4500kN to 4650kN to optimize the reduction load distribution.

[0049] 3. Optimization Phase (Dynamic Feedback):

[0050] In the subsequent three rolling passes, the closed-loop control module monitors the crown symmetry in real time:

[0051] After the first pass: the height of the reinforcing ribs drops from 0.12mm to below 0.05mm.

[0052] After the third pass: the symmetry of the strip crown tends to be uniform, and the wedge value on the right side is controlled at 0.018 mm / m, reaching the optimal range. The lateral displacement of the vertical roll is gradually reduced back to the reference value (0 mm).

[0053] Tension fluctuation: The tension fluctuation coefficient in the tailing risk section is controlled within ±3%, eliminating the cause of roll marks.

[0054] result:

[0055] After rolling, leveling, and annealing, the performance test data of the finished sheet are as follows:

[0056] Surface quality: No visible ribs or transverse folds; surface finish Ra is stable at 1.0-1.6μm.

[0057] Shape accuracy: The measured convexity symmetry (Cp / Cpk) is improved by 35%, and the flatness index I value is optimized from 2.5 to 0.8.

[0058] End-user application: The customer stacking rate has significantly increased from 82% to 98.5%, and the product difference between the same plate is controlled within ≤0.03mm, fully meeting the stringent requirements of high-end silicon steel customers.

[0059] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for controlling the cross-sectional shape of hot-rolled strip steel, characterized in that, include: Step 1: Collect strip crown data; Step 2: Draw a strip width profile based on the strip crown data; Step 3: Identify and locate hot-rolled sheet shape defects on the strip surface using the strip width profile diagram; Step 4: Eliminate hot-rolled plate shape defects based on the positioning results.

2. The method for controlling the cross-sectional shape of hot-rolled strip steel according to claim 1, characterized in that, Step 4 includes: adjusting the vertical roll lateral movement based on the positioning result, adjusting the rolling leveling value at the same time, establishing a centering state, and monitoring the deformation uniformity of the strip width direction in real time in the centering state. By dynamically adjusting the rolling force distribution, the symmetry of the strip crown is ensured to eliminate hot-rolled plate shape defects.

3. The method for controlling the cross-sectional shape of hot-rolled strip steel according to claim 2, characterized in that, Step 4 also includes: when the single-sided wedge value is detected to exceed the preset threshold, the vertical roll lateral movement compensation mechanism is immediately triggered to adjust the strip center axis to coincide with the rolling center line.

4. The method for controlling the cross-sectional shape of hot-rolled strip steel according to claim 3, characterized in that, Step 4 also includes: analyzing tension fluctuation data during the rolling process, and adjusting the vertical roll opening in advance to suppress roll marks when the tension fluctuation data exceeds the set range.

5. A hot-rolled strip cross-sectional shape control system, characterized in that, include: The data acquisition module is used to collect strip crown data; The profile drawing module is used to draw the profile of the strip width based on the strip crown data; The defect identification module is used to identify and locate hot-rolled sheet shape defects on the surface of the strip by means of the strip width profile diagram; A closed-loop control module is used to eliminate hot-rolled sheet shape defects based on the positioning results.

6. An electronic device comprising a bus, a transceiver, a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the transceiver, the memory, and the processor are connected via the bus, characterized in that, When the computer program is executed by the processor, it implements the steps in the hot-rolled strip cross-sectional shape control method as described in any one of claims 1-4.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps in the hot-rolled strip cross-sectional shape control method as described in any one of claims 1-4.

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