A method and storage medium for improving the thickness qualification rate of cold-rolled strip steel finished products
By gradually increasing the rolling speed and implementing automatic thickness control, the rolling process of cold-rolled strip steel was optimized, solving the problem of low thickness qualification rate of finished cold-rolled strip steel and achieving efficient thickness control and improved yield.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SHOUGANG ZHIXIN QIAN AN ELECTROMAGNETIC MATERIALS CO LTD
- Filing Date
- 2023-03-03
- Publication Date
- 2026-05-26
AI Technical Summary
The low thickness qualification rate of cold-rolled strip steel products leads to increased cutting losses, reduced steel coil yield, high production costs, and low production efficiency.
By gradually increasing the rolling speed, combined with feedback AGC from the automatic thickness control system and second-by-second flow control, the rolling process is optimized to ensure that the strip thickness is within the specified range, and the highest process speed is used for tailing.
Reduce the number of meters of strip thickness deviation at the beginning and end, improve the longitudinal thickness control accuracy of strip, increase the finished product thickness qualification rate, reduce production costs, and increase yield.
Smart Images
Figure CN116274356B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of steel rolling production technology, and more specifically, to a method for improving the thickness qualification rate of cold-rolled strip steel products, a computer-readable storage medium, and an electronic device. Background Technology
[0002] The qualified rate of strip thickness of finished products from a cold-rolled 20-roll mill is an important indicator for measuring the thickness of strip steel. It directly reflects the quality of longitudinal thickness difference of finished strip steel and determines the product yield of subsequent production lines of the mill.
[0003] When the thickness deviation of the inner and outer rings of the rolled strip is too large, the strip thickness qualification rate is low. The subsequent production line of the rolling mill will cut off the portion of the inner and outer rings with excessive thickness deviation, which increases the strip cutting loss and reduces the yield of steel coils.
[0004] Therefore, there is an urgent need for a method to improve the thickness qualification rate of finished strip steel products in order to solve problems such as high production costs and low production efficiency. Summary of the Invention
[0005] The embodiments of this application provide a method for improving the thickness qualification rate of cold-rolled strip steel finished products, a computer-readable storage medium, and an electronic device. The method can reduce the number of meters of strip steel with excessive thickness deviation at the beginning and end of the finished product pass, improve the thickness qualification rate of strip steel finished products, reduce the longitudinal thickness difference of strip steel finished products, improve the thickness control accuracy of strip steel, and lay the foundation for improving the yield of downstream processes of the rolling mill.
[0006] Other features and advantages of this application will become apparent from the following detailed description, or may be learned in part from practice of this application.
[0007] According to a first aspect of the embodiments of this application, a method for improving the thickness qualification rate of cold-rolled strip steel products is provided, comprising:
[0008] After starting the rolling mill, increase the initial rolling speed for this rolling operation;
[0009] During the rolling process, when the thickness deviation of the strip is within the allowable deviation range, the rolling speed is increased in one stage.
[0010] When the rolling speed exceeds the first limit after the first stage of acceleration, the control mode in the automatic thickness control system is switched from feedback AGC to second flow rate control, and the rolling speed is accelerated in the second stage.
[0011] When the rolling speed after the second-stage acceleration exceeds the second limit value, the rolling speed is accelerated in the third stage, and the second limit value is greater than the first limit value.
[0012] The highest rolling speed is used for automatic tailing during the strip rolling tailing stage.
[0013] In some embodiments of this application, based on the foregoing scheme, increasing the initial rolling speed of this rolling process includes:
[0014] The initial rolling speed will be increased by 5%-20% based on the original initial rolling speed.
[0015] In some embodiments of this application, based on the foregoing scheme, the step of increasing the rolling speed in one stage includes:
[0016] The rolling speed is increased from the initial speed while the strip thickness is observed. If the strip thickness deviation exceeds the specified range during the speed increase, the speed increase is stopped immediately until the strip thickness deviation reaches the specified range before the speed increase is resumed.
[0017] In some embodiments of this application, based on the foregoing scheme, the first speed is any value between 4 and 5 rpm.
[0018] In some embodiments of this application, based on the foregoing scheme, the two-stage speed increase of the rolling speed includes:
[0019] The rolling speed is increased at the second speed while the strip thickness is observed. If the strip thickness deviation exceeds the specified range during the speed increase, the speed increase is stopped immediately until the strip thickness deviation reaches the specified range before the speed increase is resumed.
[0020] In some embodiments of this application, based on the foregoing scheme, the second speed is any value between 8 and 15 rpm.
[0021] In some embodiments of this application, based on the foregoing scheme, the three-stage speed increase of the rolling speed includes:
[0022] The rolling speed is increased at the third speed until the maximum allowable rolling speed is reached, while the strip thickness is observed to prevent the strip thickness deviation from exceeding the specified range.
[0023] In some embodiments of this application, based on the foregoing scheme, the third speed is any value between 50-80 rpm.
[0024] According to a second aspect of the embodiments of this application, a computer-readable storage medium is provided, wherein computer instructions are stored on the computer storage medium, and the computer instructions, when executed on a computer, cause the computer to perform the method described in the first aspect above.
[0025] According to a third aspect of the embodiments of this application, an electronic device is provided, including a memory and a processor;
[0026] The memory is used to store instructions;
[0027] The processor is configured to invoke instructions in the memory to cause the electronic device to execute the method described in the first aspect above.
[0028] The technical solution of this application can reduce the number of meters of strip thickness deviation at the beginning and end, reduce the longitudinal thickness deviation of strip, improve the strip thickness qualification rate of the rolling mill, improve the strip thickness control accuracy, lay the foundation for improving the yield of downstream processes of the rolling mill, and at the same time reduce production costs and improve economic benefits.
[0029] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description
[0030] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. In the drawings:
[0031] Figure 1 A flowchart illustrating a method for improving the thickness qualification rate of cold-rolled strip steel products according to an embodiment of this application is shown. Detailed Implementation
[0032] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided to make this application more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art.
[0033] The flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all content and operations / steps, nor do they necessarily have to be performed in the described order. For example, some operations / steps can be broken down, while others can be combined or partially combined; therefore, the actual execution order may change depending on the specific circumstances.
[0034] It should be noted that "multiple" as mentioned in this article refers to two or more.
[0035] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such uses of these terms can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described.
[0036] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.
[0037] The following detailed description of some embodiments of this application will be provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.
[0038] See Figure 1 The diagram shows a flowchart illustrating a method for improving the thickness qualification rate of cold-rolled strip steel products according to an embodiment of this application.
[0039] like Figure 1 As shown, a method for improving the thickness qualification rate of cold-rolled strip steel products is presented, specifically including steps S100 to S500.
[0040] Step S100: After starting the rolling mill, increase the initial rolling speed for this rolling process.
[0041] In the strip steel finishing process, after the mill starts, the automatic thickness control system mainly uses feedback AGC (Automatic Gauge Control). Because there is a certain distance between the roll gap and the exit thickness gauge, there is a delay in the feedback AGC control, causing the mill's reduction mechanism to be improperly adjusted during initial rolling, resulting in excessive thickness at the strip head. Therefore, in this embodiment, after the mill starts, the initial rolling speed (also called the start-up speed) is rapidly increased. The purpose is to minimize the number of meters of strip with excessive thickness deviation at the corresponding rolling speed, ensuring that the strip shape control is effectively implemented.
[0042] In some feasible embodiments, increasing the initial rolling speed of this rolling process includes increasing the initial rolling speed of this rolling process by 5%-20% based on the original initial rolling speed.
[0043] For example, if the original initial rolling speed is 30 rpm, then in this embodiment, the initial rolling speed is obtained by increasing it by 5%-20% based on 30 rpm.
[0044] Understandably, the original initial rolling speed refers to the initial rolling speed when the rolling mill was started in the past. Usually, the initial rolling speed is a fixed value. Of course, the average value of the initial rolling speed in the previous rolling processes can also be taken as the "original initial rolling speed".
[0045] Continue to refer to Figure 1 In step S200, during the rolling process, when the thickness deviation of the strip is within the allowable deviation range, the rolling speed is increased in one stage.
[0046] Understandably, if the thickness of the rolled strip meets the requirements during the rolling process, then the rolling speed can be increased to improve rolling efficiency.
[0047] In some feasible embodiments, the one-stage increase in rolling speed includes:
[0048] The rolling speed is increased from the initial speed while the strip thickness is observed. If the strip thickness deviation exceeds the specified range during the speed increase, the speed increase is stopped immediately until the strip thickness deviation reaches the specified range before the speed increase is resumed.
[0049] It should be noted that ensuring that the strip thickness meets the requirements is one of the main technical problems to be solved by the technical solution of this application. Therefore, during the rolling process, when the thickness deviation of the strip is found to exceed the specified range, the speed increase must be stopped immediately and readjusted to ensure that the thickness of the rolled strip meets the requirements.
[0050] In some feasible embodiments, the first speed is selected as any value between 4 and 5 rpm.
[0051] For example, based on the aforementioned example, the initial rolling speed is increased by 10% from 30 rpm, that is, the initial rolling speed is 33 rpm. During the first-stage speed increase process, if the first speed is 4 rpm, then the initial rolling speed is based on 33 rpm and is increased by 4 rpm each time until it exceeds the first limit value.
[0052] Continue to refer to Figure 1 In step S300, when the rolling speed after the first stage of acceleration exceeds the first limit value, the main control mode in the automatic thickness control system is switched from feedback AGC to second flow rate control, and the rolling speed is accelerated in the second stage.
[0053] It should be noted that the second-flow control calculates the strip outlet thickness based on the actual speed and thickness of the strip at the inlet and outlet, and then adjusts the pressing by comparing the calculated strip outlet thickness with the target thickness. This is a pre-thickness control method.
[0054] In some feasible embodiments, the two-stage speed increase of the rolling speed includes:
[0055] The rolling speed is increased at the second speed while the strip thickness is observed. If the strip thickness deviation exceeds the specified range during the speed increase, the speed increase is stopped immediately until the strip thickness deviation reaches the specified range before the speed increase is resumed.
[0056] As described above, ensuring that the strip thickness meets the requirements is one of the main technical problems that this application's technical solution addresses. Therefore, it is also necessary to ensure that the strip thickness meets the requirements during the second-stage speed-up process.
[0057] In some feasible embodiments, the second speed is any value between 8 and 15 rpm.
[0058] It should be noted that the selectable speed values for the first and second speeds are relatively small to avoid situations where the strip thickness exceeds tolerances due to a large increase in rolling speed before reaching the second limit value. Accelerating within a smaller range can effectively reduce the number of meters of strip head thickness exceeding tolerances.
[0059] For example, if the first limit is 50 rpm, based on the above example, the initial rolling speed is increased from 33 rpm, increasing by 4 rpm each time. After five increases, the rolling speed is increased to 53 rpm, which exceeds the first limit. The rolling speed then enters the second stage of acceleration. If the second speed is 10 rpm during the second stage of acceleration, the rolling speed is based on 53 rpm, increasing by 10 rpm each time, until the rolling speed exceeds the second limit.
[0060] Continue to refer to Figure 1 In step S400, when the rolling speed after the second-stage speed-up exceeds the second limit value, the rolling speed is increased in the third stage.
[0061] In some feasible embodiments, the rolling speed is increased at a third speed until the maximum permissible rolling speed is reached, while the strip thickness is observed to prevent the strip thickness deviation from the specified range.
[0062] As described above, ensuring that the strip thickness meets the requirements is one of the main technical problems that this application's technical solution addresses. Therefore, it is also necessary to ensure that the strip thickness meets the requirements during the three-stage speed-up process.
[0063] It should be noted that when the rolling speed exceeds the second limit value, the thickness deviation of the strip is observed. At this time, the thickness deviation of the strip remains stable within the specified range, and the strip shape conforms to the target shape, indicating that the strip rolling has become stable and the thickness will not change significantly. Therefore, the speed can be increased significantly until the maximum allowable rolling speed is reached to further improve production efficiency.
[0064] It should be noted that a thickness gauge is used throughout the rolling process to monitor the thickness change of the strip in real time, ensuring the accuracy and reliability of the strip thickness measurement.
[0065] In some feasible embodiments, the third speed is selected as any value between 50 and 80 rpm.
[0066] For example, the second limit is 100 rpm. Based on the above example, the rolling speed during the second stage of acceleration is 53 rpm, which is increased by 10 rpm each time. After five increases, the rolling speed is 103 rpm, which exceeds the second limit. The rolling speed then enters the third stage of acceleration. If the third speed is 50 rpm during the third stage of acceleration, then it is based on 103 rpm and increased by 50 rpm each time until the rolling speed reaches the maximum allowable rolling speed.
[0067] The technical solution of this application utilizes a phased acceleration method, which, while increasing the speed, also ensures that the thickness of the rolled strip meets the specified range, greatly improving rolling efficiency and the qualified rate of finished strip thickness.
[0068] Continue to refer to Figure 1 In step S500, the highest rolling speed in the rolling strip is used for automatic tailing during the tailing stage.
[0069] It should be noted that when the rolling speed exceeds the first limit, the main control mode in the automatic thickness control system switches from feedback AGC to flow rate control per second. During subsequent rolling, the automatic thickness control system maintains flow rate control per second. Since the flow rate control per second for the finished strip pass is an automatic speed control mode, the higher the rolling speed, the better the thickness accuracy control. Therefore, using the highest process rolling speed for automatic tailing during the strip tailing stage can effectively control the thickness accuracy of the strip tail and reduce longitudinal thickness deviation. If the strip tail shape is poor or deviates, the rolling speed can be reduced to a certain low speed value before automatic tailing; this low speed value should not be less than 200 rpm.
[0070] In another aspect, this application also provides a computer-readable storage medium storing computer instructions that, when executed on a computer, cause the computer to perform a method for improving the thickness qualification rate of cold-rolled strip steel products provided in the above embodiments.
[0071] In another aspect, this application also provides an electronic device, including a memory and a processor;
[0072] The memory is used to store instructions;
[0073] The processor is used to call instructions in the memory, causing the electronic device to execute a method for improving the thickness qualification rate of cold-rolled strip steel products provided in the above embodiments.
[0074] Below is a specific implementation example.
[0075] A cold-rolled 20-roll mill is used to roll S12 steel with specifications ranging from 2.3×1080mm to 0.35×1080mm. The mill consists of five passes, with the coiler at the inlet and the coiler at the outlet. The thickness deviation of the finished product is required to be ±10μm. The fifth pass is started after the first four passes are completed.
[0076] The first step is to start the machine by the main operator. When the speed reaches 30 rpm, immediately increase the speed to 33 rpm, adjust the intermediate roller and the ASU control plate shape, and at the same time observe the thickness deviation interface of the thickness gauge.
[0077] The second step is to observe the thickness deviation interface of the thickness gauge. When the thickness deviation is within ±10μm, and the plate shape conforms to the target plate shape, continue to increase the speed. When the observed thickness deviation exceeds ±10μm, maintain the speed. At this time, the rolling speed is 37rpm.
[0078] The third step is to observe the thickness deviation interface of the thickness gauge. When the thickness deviation is within ±10μm and there are no abnormalities in the strip plate type, the speed can be increased to 46rpm twice.
[0079] The fourth step is to observe the thickness deviation interface of the thickness gauge. The rolling speed is increased by an average of 12 rpm, and the thickness deviation is kept within ±10 μm.
[0080] Fifth step: When the rolling speed reaches 100 rpm, the strip shape conforms to the target strip shape and the thickness deviation reaches ±5 μm. The rolling speed is increased by an average of 60 rpm and maintained until the rolling speed reaches 800 rpm. Observe that there is no emulsion phenomenon on the surface of the exit strip.
[0081] The sixth step is the rolling tailing stage. The steel coil at the inlet coiler is not misaligned. The high-speed tailing is carried out at 800 rpm. When the strip steel at the inlet coiler is 300-400 meters, the automatic tailing is carried out.
[0082] It should be noted that the computer-readable medium shown in the embodiments of this application can be a computer-readable signal medium or a computer-readable storage medium, or any combination of the two. A computer-readable storage medium can be, for example,—but not limited to—an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of a computer-readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), flash memory, optical fiber, portable compact disc read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In this application, a computer-readable storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device. In this application, a computer-readable signal medium can include a data signal propagated in baseband or as part of a carrier wave, carrying computer-readable program code. Such transmitted data signals can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. The computer-readable signal medium can also be any computer-readable medium other than a computer-readable storage medium, which can send, propagate, or transmit a program for use by or in connection with an instruction execution system, apparatus, or device. The program code contained on the computer-readable medium can be transmitted using any suitable medium, including but not limited to wireless, wired, etc., or any suitable combination thereof.
[0083] Through the above description of the embodiments, those skilled in the art will readily understand that the exemplary embodiments described herein can be implemented by software or by combining software with necessary hardware. Therefore, the technical solutions according to the embodiments of this application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (such as a CD-ROM, USB flash drive, external hard drive, etc.) or on a network, including several instructions to cause a computing device (such as a personal computer, server, touch terminal, or network device, etc.) to execute the method according to the embodiments of this application.
[0084] Other embodiments of this application will readily conceive of by those skilled in the art upon consideration of the specification and practice of the embodiments disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. It should be understood that this application is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.
Claims
1. A method for improving the thickness qualification rate of a cold-rolled strip product, characterized in that, include: In the strip steel finished product pass process, after starting the rolling mill, the initial rolling speed of this rolling is increased; During the rolling process, when the thickness deviation of the strip is within the allowable deviation range, the rolling speed is increased in one stage. The step of increasing the rolling speed in one stage includes: increasing the rolling speed by a first speed each time; the first speed is selected as any value between 4 and 5 rpm; When the rolling speed exceeds the first limit value after the first stage of acceleration, the control mode in the automatic thickness control system switches from feedback AGC to second flow rate control, and at the same time, the rolling speed is accelerated in a second stage; the second stage of acceleration of the rolling speed includes: the rolling speed is increased to a second speed each time; the second speed is selected from any value between 8-15 rpm; When the rolling speed after the second-stage acceleration exceeds the second limit value, the rolling speed is accelerated in a third stage until the rolling speed reaches the maximum allowable rolling speed, where the second limit value is greater than the first limit value; the three-stage acceleration of the rolling speed includes: increasing the rolling speed by a third speed each time; the third speed is selected from any value between 50-80 rpm; The highest rolling speed is used for automatic tailing during the strip rolling tailing stage.
2. The method of claim 1, wherein, The increase in the initial rolling speed of this rolling process includes: The initial rolling speed for this rolling process will be increased by 5%-20% based on the original initial rolling speed.
3. The method of claim 1, wherein, The one-stage speed increase of the rolling speed includes: Each time the rolling speed is increased to the first speed, the strip thickness is observed. If the strip thickness deviation is found to exceed the specified range during the speed increase, the speed increase is stopped immediately until the strip thickness deviation reaches the specified range before the speed increase is resumed.
4. The method according to claim 1, characterized in that, The two-stage speed increase of the rolling speed includes: Each time the rolling speed is increased to the second speed, the strip thickness is observed. If the strip thickness deviation exceeds the specified range during the speed increase, the speed increase is stopped immediately until the strip thickness deviation reaches the specified range before the speed increase is resumed.
5. The method according to claim 1, characterized in that, The three-stage speed increase of the rolling speed includes: The rolling speed is increased to the third speed each time until the maximum allowable rolling speed is reached. At the same time, the strip thickness is observed to prevent the strip thickness deviation from exceeding the specified range.
6. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that, when executed on a computer, cause the computer to perform the method of any one of claims 1-5.
7. An electronic device, characterized in that, Including memory and processor; The memory is used to store instructions; The processor is configured to invoke instructions in the memory to cause the electronic device to perform the method of any one of claims 1-5.