Method and device for controlling wear in an acid pickling process

Abstract

The application relates to the rolling technology field of metal, in particular to a control method and device for wear of an acid pickling process, the control method comprising the following steps: increasing roughness of chromium-plated rollers of a No. 1 sub-frame, a No. 2 sub-frame and a No. 3 sub-frame of an acid pickling rack by 13%, and the roughness is less than or equal to 0.9; reducing a rear tension of the acid pickling rack by 6%, and increasing a front tension of the acid pickling rack by 12%; matching lubricant of a corresponding concentration according to a reduction ratio of a rolled strip steel; monitoring tension fluctuation of the No. 2 sub-frame, and reducing rolling speed of the No. 2 sub-frame when the tension fluctuation exceeds a tension threshold value and exceeds a time threshold value. Through the method, wear of the chromium-plated rollers and the strip steel caused by difficult biting of the strip steel in the No. 2 sub-frame and the No. 3 sub-frame of the acid pickling rack in the middle and late stages of the acid pickling is effectively eliminated, production cost is reduced, and production efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of metal rolling technology, and more particularly to a method and apparatus for controlling wear during pickling and rolling processes. Background Technology

[0002] The pickling and rolling production line uses chrome-plated rolls on pickling stands to roll strip steel. When rolling low-alloy high-strength steel, the No. 2 and No. 3 sub-stands within the pickling and rolling mill often experience bite difficulties in the later stages of rolling, meaning the strip steel cannot smoothly enter the sub-stands. This bite difficulty causes a significant deviation between the roll surface speed and the strip steel speed; the linear speed of the rolls exceeds the deformation speed of the strip steel, resulting in linear wear of the roll surface and frequent quality defects in the strip steel due to continuous scratches. Therefore, frequent shutdowns for roll replacement are necessary, increasing production costs and reducing production efficiency. Therefore, eliminating the bite difficulties on the No. 2 and No. 3 sub-stands within the pickling and rolling mill is a pressing technical problem that needs to be solved. Summary of the Invention

[0003] This application provides a method for controlling wear during the pickling and rolling process, which solves the technical problem of how to eliminate the difficulty of biting in the No. 2 and No. 3 substands within the pickling and rolling mill.

[0004] In a first aspect, this application provides a method for controlling wear during the pickling and rolling process. The method for controlling wear during the pickling and rolling process is characterized by comprising:

[0005] The roughness of the chrome-plating rolls of the No. 1, No. 2 and No. 3 sub-stands of the pickling and rolling mill is increased by 13%, and the roughness is less than or equal to 0.9.

[0006] The back tension of the pickling and rolling mill stand is reduced by 6%, and the front tension of the pickling and rolling mill stand is increased by 12%.

[0007] Use lubricant of appropriate concentration according to the reduction rate of the rolled strip;

[0008] Monitor the tension fluctuation of the No. 2 substand. When the tension fluctuation exceeds the tension threshold and the time threshold, reduce the rolling speed of the No. 2 substand.

[0009] Furthermore, the step of matching the lubricant concentration according to the reduction rate of the rolled strip includes: when the type of the strip is low-alloy high-strength steel, controlling the lubricant concentration to be 2.9%.

[0010] Furthermore, the step of matching the lubricant concentration according to the reduction rate of the rolled strip includes: when the type of strip is a high reduction rate strip, controlling the lubricant concentration to 3.2%.

[0011] Furthermore, the method also includes: matching the lubricant concentration according to the reduction rate of the rolled strip, and obtaining the corresponding concentration by controlling the unit amount of lubricant added and the liquid level.

[0012] Furthermore, the tension threshold is 2 MPa, and the time threshold is 2 seconds.

[0013] Furthermore, the method also includes issuing a buzzer alarm when the tension fluctuation exceeds a tension threshold and a time threshold.

[0014] Secondly, this application provides a wear control device for the pickling and rolling process, the control device comprising:

[0015] The first control module is used to improve the roughness of the chrome-plating rolls of the No. 1, No. 2 and No. 3 sub-stands of the pickling mill by 13%, and to ensure that the roughness is less than or equal to 0.9.

[0016] The second control module is used to reduce the rear tension of the pickling and rolling mill stand by 6% and increase the front tension of the pickling and rolling mill stand by 12%.

[0017] The third control module is used to match the appropriate concentration of lubricant according to the reduction rate of the rolled strip.

[0018] The fourth control module is used to monitor the tension fluctuation of the No. 2 substand. When the tension fluctuation exceeds the tension threshold and the time threshold, the rolling speed of the No. 2 substand is reduced.

[0019] Furthermore, the third control module matches the lubricant concentration according to the reduction rate of the rolled strip, and obtains the corresponding concentration by controlling the unit amount of lubricant added and the liquid level.

[0020] Thirdly, this application provides an electronic device including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the steps of the method described in any of the first aspects.

[0021] Fourthly, this application provides a computer-readable storage medium having a computer program stored thereon that, when executed by a processor, implements the steps of any of the methods described in the first aspect.

[0022] One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:

[0023] In this embodiment of the invention, firstly, the roughness of the chrome-plated rolls of sub-stands 1, 2, and 3 of the pickling and rolling mill is increased by 13%, and the roughness is less than or equal to 0.9, thereby delaying the roughness decay of the chrome-plated rolls in the later stages of rolling to provide a friction angle not less than the bite angle, allowing the sub-stands to smoothly bite into the strip. Next, the back tension of the pickling and rolling mill is reduced by 6%, and the front tension is increased by 12%, thereby increasing the friction force and preventing slippage and wear. Then, a lubricant of corresponding concentration is used according to the reduction rate of the rolled strip to meet the requirements of strips with different reduction rates for post-processing elongation. Finally, the tension fluctuation of sub-stand 2 is monitored. When the tension fluctuation exceeds the tension threshold and the time threshold, the rolling speed of sub-stand 2 is reduced to avoid frequent speed fluctuations that cause bite difficulties. The method provided in this embodiment effectively eliminates the wear on the chrome-plated rolls and strip caused by the difficulty in strip biting in the second and third sub-stands of the pickling and rolling mill during the middle and late stages of pickling and rolling. This results in reduced production costs and improved production efficiency. Attached Figure Description

[0024] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings.

[0025] In the attached diagram:

[0026] Figure 1 This diagram illustrates the steps of the method provided in the embodiments of the present invention.

[0027] Figures 2(a) and (b) show the strip surfaces obtained before and after using the method provided by the present invention, respectively;

[0028] Figure 3 This diagram shows the decrease in surface roughness of the strip steel before and after using this method.

[0029] Figure 4 A schematic diagram of an electronic structure device according to an embodiment of the present invention is shown. Detailed Implementation

[0030] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0031] Example 1

[0032] A pickling and rolling mill typically consists of five substands arranged in a continuous row. During the pickling and rolling process, the strip steel sequentially enters multiple chrome-plated rolls on substands 1-5 for rolling. In the middle and later stages of pickling and rolling low-alloy high-strength steel, the strip steel often cannot smoothly enter substands 2 and 3 of the pickling and rolling mill, resulting in wear on the strip surface and the chrome-plated rolls.

[0033] This embodiment provides the following: Figure 1 The method shown is a wear control method in the pickling and rolling process, which solves the technical problem of how to eliminate the difficulty of biting in the No. 2 and No. 3 substands in the pickling and rolling mill. The method includes steps S101-S104.

[0034] Step S101: Increase the roughness of the chrome-plating rolls of the No. 1, No. 2 and No. 3 sub-stands of the pickling and rolling mill by 13%, and ensure that the roughness is less than or equal to 0.9.

[0035] Step S102: Reduce the rear tension of the pickling and rolling mill stand by 6% and increase the front tension of the pickling and rolling mill stand by 12%.

[0036] Step S103: Use a lubricant of the appropriate concentration according to the reduction rate of the rolled strip.

[0037] Step S104: Monitor the tension fluctuation of the No. 2 substand. When the tension fluctuation exceeds the tension threshold and the time threshold, reduce the rolling speed of the No. 2 substand.

[0038] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0039] First, it should be clarified that the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0040] Step S101: Increase the roughness of the chrome-plating rolls of sub-stands 1, 2, and 3 of the pickling mill by 13%, and ensure that the roughness is less than or equal to 0.9.

[0041] Specifically, through data analysis of a large amount of rolling process and rolling results, it was determined that the necessary condition for the strip to smoothly enter the mill stand and avoid bite difficulties is that the bite angle ≤ the friction angle. In the later stages of pickling and rolling, due to excessive wear of the chrome-plated rolls, the roughness of the chrome-plated rolls decreases, leading to a reduction in the friction angle. When the friction angle is less than the bite angle, bite difficulties occur. Therefore, in order to delay the roughness decay of the chrome-plated rolls in the later stages of rolling and provide a friction angle not less than the bite angle to ensure smooth strip bite into the sub-stand, the roughness of the chrome-plated rolls in sub-stands 1, 2, and 3 of the pickling and rolling mill was increased by 13%.

[0042] For example, in the pickling and rolling section 2, the roughness of the original chrome-plated rolls on stands 1-3 is 0.75. Before starting the machine, the roughness of the chrome-plated rolls on stands 1, 2, and 3 is set to 0.85.

[0043] Furthermore, since the roughness requirement for the strip steel before and after chrome plating is a roughness of 0.7-0.9, the maximum roughness of the chrome plating rollers on sub-stands 1, 2, and 3 after the improvement is 0.9.

[0044] Step S102: Reduce the back tension of the pickling and rolling mill stand by 6% and increase the front tension of the pickling and rolling mill stand by 12%.

[0045] Specifically, the direction in which the strip enters the chrome plating roll is defined as the front. By reducing the rear tension of the pickling and rolling mill stand by 6% and increasing the front tension of the pickling and rolling mill stand by 12%, the front tension is controlled to be greater than the rear tension. This increases the friction at the contact interface when the strip is bitten in, preventing the strip from slipping and causing difficulty in biting in, which would lead to wear on the equipment or the strip, and improves the quality of the strip and the service life of the chrome plating roll.

[0046] Step S103: Use a lubricant of the appropriate concentration according to the reduction rate of the rolled strip.

[0047] Specifically, different types of strip steel have different reduction rates. Low-alloy high-strength steel has a small reduction rate and severe hardening after processing, requiring a large rolling force. The lubricant concentration should be reduced accordingly to provide the friction conditions required during the rolling of low-alloy high-strength steel. Therefore, when the type of strip steel is low-alloy high-strength steel, the lubricant concentration is controlled at 2.9%.

[0048] For strip steel with a high reduction rate, such as strip steel with a high reduction rate of 1F, it is necessary to meet the elongation requirements after processing. Therefore, when the type of strip steel is strip steel with a high reduction rate, the concentration of the lubricant is controlled to be 3.2%.

[0049] After matching the lubricant concentration with the reduction rate of the rolled strip, the corresponding concentration is obtained by controlling the unit amount of lubricant and the liquid level. In this embodiment, the unit amount of lubricant is 0.23L / ton, which is combined with a high liquid level to quickly and effectively switch the concentration.

[0050] Step S104: Monitor the tension fluctuation of the No. 2 substand. When the tension fluctuation exceeds the tension threshold and the time threshold, reduce the rolling speed of the No. 2 substand.

[0051] Specifically, the tension threshold for tension fluctuation on the rear (OS-DS) side of sub-stand No. 2 is 2 MPa. If automatic speed reduction is triggered as soon as the tension reaches this threshold, it will lead to frequent speed fluctuations during the production of low-alloy high-strength steel, which is detrimental to stable biting and further increases the difficulty of stable biting in the later stages of roll production. Therefore, a time threshold of 2 seconds is set. When the tension fluctuation on the rear (OS-DS) side of sub-stand No. 2 reaches 2 MPa and lasts for more than 2 seconds, a speed reduction alarm protection is automatically triggered, effectively avoiding frequent speed fluctuations during the production of low-alloy high-strength steel and facilitating continuous and stable biting.

[0052] Figures 2(a) and (b) show the surface finish of the strip before and after pickling and rolling using this method, respectively. Figure 3 The dashed and solid lines represent the attenuation of the surface roughness of the strip obtained by rolling. It can be seen that before using this method, the strip experienced difficulties in biting and slippage in the pickling mill during the later stages of rolling, resulting in severe surface scratches and affecting the strip quality. After using this method, the strip surface is free of scratches, and the strip quality is improved. The method provided in this embodiment effectively eliminates the wear on the chrome-plated rolls and strip caused by difficulties in biting the strip in the second and third sub-stands of the pickling mill during the later stages of pickling, thereby reducing production costs and improving production efficiency.

[0053] The method provided in this application can avoid 100 tons of scrap material per month caused by continuous scratches, increasing revenue by 100 tons * 50,000 = 50,000 per month. It can also reduce the extra consumption of rolls by 30 pairs per month, saving costs: 30 pairs * 4,000 / pair = 120,000 per month. Furthermore, it saves 60 minutes per month in deceleration and roll changing time, increasing production capacity by 360 tons per month and increasing revenue by 360 tons * 30,000 = 108,000 per month. The total increase in annual revenue is (50,000 + 120,000 + 108,000) * 12 months = 3,336,000 per year.

[0054] Example 2

[0055] Based on the same inventive concept, Embodiment 2 of this application provides a method and apparatus for controlling wear during pickling and rolling processes, the control apparatus comprising:

[0056] The first control module is used to improve the roughness of the chrome-plating rolls of the No. 1, No. 2 and No. 3 sub-stands of the pickling mill by 13%, and to ensure that the roughness is between 0.7 and 0.9.

[0057] The second control module is used to reduce the rear tension of the pickling and rolling mill stand by 6% and increase the front tension of the pickling and rolling mill stand by 12%.

[0058] The third control module is used to match the appropriate concentration of lubricant according to the type of strip being rolled.

[0059] The fourth control module is used to monitor the tension fluctuation of the No. 2 substand. When the tension fluctuation exceeds the tension threshold and the time threshold, the rolling speed of the No. 2 substand is reduced.

[0060] The device provided in this embodiment effectively eliminates the wear on the chrome-plated rolls and strip caused by the difficulty in strip biting in the second and third sub-stands of the pickling and rolling mill during the middle and late stages of pickling and rolling. This results in reduced production costs and improved production efficiency.

[0061] Example 3

[0062] Based on the same inventive concept, Embodiment 3 of this application provides an electronic device, as shown in the appendix. Figure 4 As shown, it includes a memory 304, a processor 302, and a computer program stored in the memory 304 and executable on the processor 302. When the processor 302 executes the program, it implements the steps of the above-described method for controlling wear in a pickling and rolling process.

[0063] Among them, Figure 4 In this document, a bus architecture (represented by bus 300) is used. Bus 300 may include any number of interconnected buses and bridges, linking various circuits including one or more processors represented by processor 302 and memory represented by memory 304. Bus 300 may also link various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and therefore will not be described further herein. Bus interface 306 provides an interface between bus 300 and receiver 301 and transmitter 303. Receiver 301 and transmitter 303 may be the same element, i.e., a transceiver, providing a unit for communicating with various other devices over a transmission medium. Processor 302 is responsible for managing bus 300 and general processing, while memory 304 can be used to store data used by processor 302 during operation.

[0064] Example 4

[0065] Based on the same inventive concept, Embodiment 4 of the present invention provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the steps of the above-described method for controlling wear in a pickling and rolling process.

[0066] The algorithms and displays provided herein are not inherently related to any particular computer, virtual system, or other device. Various general-purpose systems can also be used in conjunction with the teachings herein. The required structure for constructing such systems is apparent from the above description. Furthermore, this invention is not directed to any particular programming language. It should be understood that the contents of the invention described herein can be implemented using various programming languages, and the above description of specific languages ​​is for the purpose of disclosing the best mode of implementation of the invention.

[0067] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0068] Similarly, it should be understood that, in order to simplify this disclosure and aid in understanding one or more of the various aspects of the invention, in the above description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof. However, this method of disclosure should not be construed as reflecting an intention that the claimed invention requires more features than are expressly recited in each claim. Rather, as reflected in the following claims, inventive aspects lie in fewer than all features of a single foregoing disclosed embodiment. Therefore, the claims following the detailed description are hereby expressly incorporated into this detailed description, wherein each claim itself is a separate embodiment of the invention.

[0069] Those skilled in the art will understand that modules in the device of the embodiments can be adaptively changed and placed in one or more devices different from that embodiment. Modules, units, or components in the embodiments can be combined into a single module, unit, or component, and further, they can be divided into multiple sub-modules, sub-units, or sub-components. Except where at least some of such features and / or processes or units are mutually exclusive, any combination can be used to combine all features disclosed in this specification (including the accompanying claims, abstract, and drawings) and all processes or units of any method or device so disclosed. Unless expressly stated otherwise, each feature disclosed in this specification (including the accompanying claims, abstract, and drawings) may be replaced by an alternative feature that serves the same, equivalent, or similar purpose.

[0070] Furthermore, those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of the invention and form different embodiments. For example, in the following claims, any of the claimed embodiments can be used in any combination.

[0071] The various component embodiments of the present invention can be implemented in hardware, or as software modules running on one or more processors, or a combination thereof. Those skilled in the art will understand that microprocessors or digital signal processors (DSPs) can be used in practice to implement some or all of the functions of some or all of the components in the electronic device according to embodiments of the present invention. The present invention can also be implemented as a device or apparatus program (e.g., a computer program and computer program product) for performing part or all of the methods described herein. Such programs implementing the present invention can be stored on a computer-readable medium or can be in the form of one or more signals. Such signals can be downloaded from an Internet website, provided on a carrier signal, or provided in any other form.

[0072] The above descriptions are merely embodiments of this application. Commonly known structures and characteristics of the solutions are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are aware of all existing technologies in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, based on the guidance provided in this application, improve and implement this solution in combination with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this application. These should also be considered within the scope of protection of this application, and will not affect the effectiveness of the implementation of this application or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A method for controlling wear during pickling and rolling processes, characterized in that, The control method includes, The roughness of the chrome-plating rolls of the No. 1, No. 2 and No. 3 sub-stands of the pickling and rolling mill is increased by 13%, and the roughness is less than or equal to 0.

9. The back tension of the pickling and rolling mill stand is reduced by 6%, and the front tension of the pickling and rolling mill stand is increased by 12%. Use lubricant of appropriate concentration according to the reduction rate of the rolled strip; Monitor the tension fluctuation of the No. 2 substand; when the tension fluctuation exceeds both the tension threshold and the time threshold, reduce the rolling speed of the No. 2 substand. The step of matching the lubricant concentration according to the reduction rate of the rolled strip includes: when the type of strip is low-alloy high-strength steel, controlling the lubricant concentration to be 2.9%; When the strip is a high reduction rate strip, the lubricant concentration is controlled at 3.2%.

2. The method for controlling wear during pickling and rolling as described in claim 1, characterized in that, The method further includes: matching the lubricant concentration according to the reduction rate of the rolled strip, and obtaining the corresponding concentration by controlling the unit amount of lubricant added and the liquid level.

3. The method for controlling wear during pickling and rolling as described in claim 1, characterized in that, The tension threshold is 2 MPa, and the time threshold is 2 seconds.

4. The method for controlling wear during pickling and rolling as described in claim 1, characterized in that, The method further includes issuing a buzzer alarm when the tension fluctuation exceeds a tension threshold and a time threshold.

5. A wear control device for a pickling and rolling process, characterized in that, The control device includes, The first control module is used to improve the roughness of the chrome-plating rolls of the No. 1, No. 2 and No. 3 sub-stands of the pickling mill by 13%, and to ensure that the roughness is less than or equal to 0.

9. The second control module is used to reduce the back tension of the pickling and rolling mill stand by 6% and increase the front tension of the pickling and rolling mill stand by 12%. The third control module is used to match the appropriate concentration of lubricant according to the reduction rate of the rolled strip. The fourth control module is used to monitor the tension fluctuation of the No. 2 substand. When the tension fluctuation exceeds the tension threshold and the time threshold, the rolling speed of the No. 2 substand is reduced. The third control module is specifically used to: control the lubricant concentration to 2.9% when the strip is low-alloy high-strength steel; and control the lubricant concentration to 3.2% when the strip is high reduction ratio strip.

6. The wear control device for the pickling and rolling process as described in claim 5, characterized in that, The third control module matches the lubricant concentration according to the reduction rate of the rolled strip, and obtains the corresponding concentration by controlling the unit amount of lubricant added and the liquid level.

7. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the steps of the method as described in any one of claims 1-4.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the steps of the method as described in any one of claims 1-4.

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