A method and device for on-line surface quality detection control of a hot rolling process of pickling plate

Abstract

This application relates to an online surface quality inspection and control method and apparatus for the hot rolling process of pickled steel sheets. The method includes the following steps: obtaining a pickled steel sheet; performing an initial roll mark defect inspection on the pickled steel sheet; performing roll mark defect pickling on the pickled steel sheet based on the roll mark defect inspection results; performing a post-pickling roll mark defect inspection on the pickled steel sheet; and performing roll mark defect treatment on the pickled steel sheet based on the post-pickling roll mark defect inspection results. The online surface quality inspection and control method and apparatus for the hot rolling process of pickled steel sheets provided by this application can effectively determine the depth of roll mark defects by inspecting the manual pickling process on the inspection line, improving the accuracy of manual judgment and reducing the roll mark defect closure rate; at the same time, it can accurately determine the subsequent processing flow, reducing the production cost of the entire hot-rolled pickled steel sheet rolling process and improving work efficiency.

Description

Technical Field

[0001] This application relates to the field of hot rolling of pickled steel sheets, and in particular to a method and apparatus for online surface quality detection and control in the hot rolling process of pickled steel sheets. Background Technology

[0002] Hot-rolled pickled steel sheet is a new product technology development project, adopting a "hot-instead-of-cold" production mode. Its control process involves directly rolling the finished product through a hot continuous rolling process to the pickling process. The final pickled product is directly delivered to the end customer, eliminating the need for cold rolling and pickling. Because hot rolling directly produces the finished product, this control method is challenging in the field of hot continuous rolling technology control, with a narrow process window. Problems such as head folding and tail-wagging frequently occur, resulting in defects such as roll marks and unfinished ends on the surface of the hot-rolled finished product. Furthermore, the unique characteristics of pickled steel sheet necessitate strict requirements for surface quality, especially regarding roll marks during hot rolling. Therefore, online surface quality inspection during hot rolling is required to determine these defects.

[0003] In the existing technology, conventional hot rolling production lines use Bestway online surface quality inspection devices. Due to the different degrees of folding and tailing during the rolling process, pickled plates are prone to producing tertiary iron oxide scale during finishing rolling and laminar flow cooling. This causes Bestway online inspection devices to be greatly affected by tertiary iron oxide scale, resulting in poor monitoring effect and frequent inaccurate defect judgment.

[0004] In existing technologies, relying solely on instrument detection can lead to misjudgments. If qualified products are mistakenly identified as qualified products and blocked, it will increase the production cost of downstream leveling processes and cause ineffective roll changes on hot rolling lines, increasing the cost of hot rolling rolls. If unqualified products are mistakenly identified as qualified products and sent to the downstream pickling process, it will increase the production cost of the pickling process. In severe cases, the products may even flow into the end customer's hands, causing quality disputes. Summary of the Invention

[0005] To solve the above-mentioned technical problems, or at least partially solve them, this application provides an online surface quality inspection and control method, device, and storage medium for the hot rolling process of pickled steel plates.

[0006] In a first aspect, this application provides an online surface quality inspection and control method for the hot rolling process of pickled steel sheets, the method comprising the following steps: Obtain pickled plates; The pickled plate was inspected for original roller print defects. The pickled plate is pickled to remove roller print defects based on the inspection results of roller print defects. The pickled plate is inspected for defects in roller printing after pickling. The pickled plate is subjected to roller printing defect treatment based on the inspection results of roller printing defects after pickling.

[0007] Preferably, the initial roll mark defect inspection of the pickled plate includes the following steps: The pickled plate is hot-rolled; The surface quality of the pickled plate was monitored using Bestay Surface Technology.

[0008] Preferably, the step of monitoring the surface quality of the pickled plate using Bestay Surface Technology includes the following steps: Determine whether there are roller mark defects on the surface of the pickled plate; If so, the degree of the roller printing defect is determined; If not, the pickling plate is conveyed to the pickling process for normal production.

[0009] Preferably, the determination of the degree of the roller printing defect includes the following steps: Determine whether the degree of the roller printing defect is lower than a preset level; If so, the pickled plate is subjected to hot rolling and online pickling treatment; If not, seal the pickled plate.

[0010] Preferably, the step of judging the degree of the roller printing defect further includes the step of: Determine whether the roller printing defect has depth; If so, the roller printing defects shall be manually inspected; If not, the pickling plate is conveyed to the pickling process for normal production.

[0011] Preferably, the manual inspection of the roller printing defects includes the following steps: Determine whether the roller printing defect can be detected manually; If so, seal the pickled plate and transport it to the leveling process for further processing; If not, the pickling plate is conveyed to the pickling process for normal production.

[0012] Preferably, after the conveying to the leveling process, the method further includes the following steps: Determine whether there are roller marks on the surface of the pickled plate; If so, seal the pickled plate; If not, the pickling plate is conveyed to the pickling process for normal production.

[0013] Preferably, after the pickling plate is conveyed to the normal production stage of the pickling process, the step further includes: Determine whether any defects are found on the surface of the pickled plate after pickling; If so, seal the pickled plate; If not, the pickled plate will be delivered to the end customer.

[0014] Preferably, after the pickled plate is delivered to the end customer, the process further includes the following steps: Determine whether a quality objection should be raised regarding the pickled plate; If so, compensate the customer for quality losses; If no objection is raised, the process ends.

[0015] Secondly, this application provides an online surface quality inspection and control device for the hot rolling process of pickled steel sheets, comprising: Pickling plate acquisition module, used to acquire pickling plates; The original roller print defect inspection module is used to inspect the original roller print defects of the pickled plate. The roller printing defect pickling module is used to perform roller printing defect pickling on the pickling plate according to the roller printing defect inspection results. A pickling post-roller print defect inspection module is used to inspect the pickled plate for pickling post-roller print defects. The roller printing defect processing module is used to process the roller printing defects of the pickled plate according to the inspection results of the roller printing defects after pickling.

[0016] The technical solutions provided in this application have the following advantages compared with the prior art: This application provides an online surface quality inspection and control method and device for hot rolling of pickled steel plates. By using manual pickling on the inspection line, the depth of roll mark defects can be effectively determined, improving the accuracy of manual judgment and reducing the roll mark defect closure rate. At the same time, it can accurately determine the subsequent processing flow, reducing the production cost of the entire hot-rolled pickled steel plate rolling process and improving work efficiency. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0018] 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, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A schematic flowchart illustrating an online surface quality inspection and control method for a hot rolling process of pickled steel plate, provided in an embodiment of this application; Figure 2 This is a schematic diagram illustrating the detection of non-tailing and folding roll marks in an online surface quality inspection and control method for hot rolling of pickled steel sheets, provided in an embodiment of this application. Figure 3 This is a schematic diagram of non-tailing and folding roll marks before pickling in an online surface quality detection and control method for hot rolling of pickled steel plates provided in an embodiment of this application. Figure 4 This is a schematic diagram of non-tailing and folding roll marks after pickling in an online surface quality detection and control method for hot rolling of pickled steel plates provided in an embodiment of this application. Figure 5 This is a schematic diagram illustrating the detection of tailing and folding type roll marks in an online surface quality inspection and control method for hot rolling of pickled steel plates provided in an embodiment of this application. Figure 6 This is a schematic diagram of the tailing and folding type roll mark defects before pickling in an online surface quality detection and control method for hot rolling process of pickled steel plate provided in an embodiment of this application; Figure 7 This is a schematic diagram of the pickling process for hot rolling of pickled steel plates, specifically a method for online surface quality inspection and control in this application, illustrating the tailing and folding roller marks defects after pickling. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] Figure 1 This is a flowchart illustrating an online surface quality inspection and control method for the hot rolling process of pickled steel plates, provided in an embodiment of this application.

[0022] This application provides a method for online surface quality inspection and control in the hot rolling process of pickled steel plates, the method comprising the following steps: S1: Obtain the pickled plate; S2: Perform original roller print defect inspection on the pickled plate; In this embodiment of the application, the original roller print defect inspection of the pickled plate includes the following steps: The pickled plate is hot-rolled; The surface quality of the pickled plate was monitored using Bestay Surface Technology.

[0023] Specifically, the hot rolling production line for pickled steel sheets is unstable, which may result in folding, tailing, or slight peeling of the rolls; the hot-rolled steel sheet surface is inspected using Bestar online surface quality testing to check for roll marks.

[0024] In this embodiment of the application, the step of monitoring the surface quality of the pickled plate using Bestay Surface Technology includes the following steps: Determine whether there are roller mark defects on the surface of the pickled plate; If so, the degree of the roller printing defect is determined; If not, the pickling plate is conveyed to the pickling process for normal production.

[0025] Specifically, defective rolls of roller printing are unwound, cut, and inspected on the inspection line according to process requirements to pinpoint the location and timing of defects; the specific steps are as follows: (1) The uncoiling and cutting length L is more than twice the maximum roll diameter circumference of the finishing roll; L> Where L is the total length of the uncoiled plate. This refers to the maximum diameter of the finishing mill rolls. (2) For defects on the lower surface, after uncoiling and cutting, the plate can be directly sent to the No. 1 roller conveyor area for inspection. For defects on the upper surface, the cutting plate needs to be sent from the No. 1 roller conveyor area to the No. 2 roller conveyor area for inspection with the help of the flip arm. (3) When inspecting the uncoiled plate, switch the "prohibition mode" of the machine side box of the uncoiler, roller conveyor and tilting arm equipment to prevent the equipment from malfunctioning; (4) Based on the camera position coordinates of Bestway's defect detection and the distance coordinates between the defect and the tail of the strip, the defect location area of ​​the uncoiled plate is initially located. (5) Uncoil plate inspection: When periodic roll marks are found, perform online pickling on the hot rolling inspection line.

[0026] In this embodiment of the application, the step of judging the degree of the roller printing defect includes the following steps: Determine whether the degree of the roller printing defect is lower than a preset level; If so, the pickled plate is subjected to hot rolling and online pickling treatment; If not, seal the pickled plate.

[0027] Specifically, if no roller marks are found during the inspection of the uncoiled plate, or if roller marks are found but there is no periodic pattern, the uncoiling, cutting, and inspection steps must be repeated. After identifying the periodic roller marks, proceed with the pickling steps for roller mark defects as described in step 3. If no roller marks are found again, or if roller marks are found but there is no periodic pattern, the plate should be sealed directly. Because the temperature of the uncoiled plate during online inspection is high (T > 500℃), when the defect is located in the center of the uncoiled plate and is difficult to inspect manually, a heat-insulating plate must be used for inspection by stepping on it to prevent burns.

[0028] In this embodiment of the application, the step of judging the degree of the roller printing defect further includes the following steps: Determine whether the roller printing defect has depth; If so, the roller printing defects shall be manually inspected; If not, the pickling plate is conveyed to the pickling process for normal production.

[0029] Specifically, if the uncoiled plate is inspected and no depth of roller printing is found, the uncoiling, cutting, and inspection steps need to be repeated again. After locking the periodic roller printing, the roller printing defect pickling step in step 3 should be carried out. If the roller printing is found to be deep, the roller printing defect should be manually inspected.

[0030] In this embodiment of the application, the manual inspection of the roller printing defects includes the following steps: Determine whether the roller printing defect can be detected manually; If so, seal the pickled plate and transport it to the leveling process for further processing; If not, the pickling plate is conveyed to the pickling process for normal production.

[0031] Specifically, after pickling, if there is no obvious protrusion upon visual inspection and tactile examination after manual inspection, the material can be directly released to the hot rolling pickling process. If there is obvious protrusion upon visual inspection and tactile examination after pickling, the material is sealed off and adjusted to the hot rolling leveling process for secondary processing. If the requirements are met, the material is sent to the hot rolling pickling process. If the requirements are still not met, the material is sealed off again.

[0032] In this embodiment of the application, after the conveying to the leveling process, the following steps are further included: Determine whether there are roller marks on the surface of the pickled plate; If so, seal the pickled plate; If not, the pickling plate is conveyed to the pickling process for normal production.

[0033] Specifically, after pickling, the roller marks are checked again. If roller marks are still present, the process continues with sealing and pickling; if there are no roller marks, the process is conveyed to the pickling process for normal production.

[0034] In this embodiment of the application, after the pickling plate is conveyed to the normal production stage of the pickling process, the following step is further included: Determine whether any defects are found on the surface of the pickled plate after pickling; If so, seal the pickled plate; If not, the pickled plate will be delivered to the end customer.

[0035] Specifically, after pickling, the roller marks are checked again. If roller marks are still present, the process continues with sealing and pickling; if there are no roller marks, the product is transported to the end customer.

[0036] In this embodiment of the application, after the pickling plate is delivered to the end customer, the process further includes the following steps: Determine whether a quality objection should be raised regarding the pickled plate; If so, compensate the customer for quality losses; If no objection is raised, the process ends.

[0037] Specifically, after pickling, it is determined whether a quality objection should be raised. If a quality objection is raised, the customer will be compensated for quality losses; if no quality objection is raised, the process ends.

[0038] S2: Perform pickling of the pickled plate to remove roller printing defects based on the inspection results of roller printing defects; Specifically, after locking the roll mark defect location on the uncoil, a certain amount of pickling solution is taken from a special pickling solution container and dripped onto the defect location on the uncoil. After standing for a period of time, once the acid has reacted with the iron oxide scale, the surface of the uncoil is gently wiped with an acid-resistant tool. When a bright white mark appears on the surface of the uncoil after wiping, the online pickling is complete. When the surface of the uncoil turns dark brown after wiping, the above steps are repeated. A certain amount of pickling solution is taken from the special pickling solution container again and dripped onto the defect location on the uncoil. After standing for a period of time, once the acid has reacted with the iron oxide scale, the surface of the uncoil is gently wiped with an acid-resistant tool until a bright white mark appears on the surface, indicating that the online pickling is complete. Specialized equipment must be used for holding and extracting the pickling solution. The wiping method must be done quickly and gently using acid-resistant material. During the pickling process, operators must wear protective equipment to prevent acid leakage, evaporation, or chemical reaction between the acid and the iron scale that may cause discomfort to the operator. The amount of pickling solution removed and the settling time can be determined according to the size of the defect, and should be completed in one go as much as possible. In principle, the amount removed and the settling time of the second time should be shorter than that of the first time. The concentration of the pickling solution used for uncoiling plates can be similar to or the same as that of the pickling solution in the pickling process, generally in the range of 90-220 g / L.

[0039] S2: Inspect the pickled plate for defects in roller printing after pickling; Specifically, if no roller marks are found during the uncoiling inspection, or if roller marks are found but there is no periodic pattern, the uncoiling, cutting, and inspection steps need to be repeated again. After locking the periodic roller marks, proceed with the roller mark defect pickling step 3. If no roller marks are found or if roller marks are found but there is no periodic pattern, the plate should be sealed directly.

[0040] S2: Based on the inspection results of roller printing defects after pickling, the pickled plate is subjected to roller printing defect treatment.

[0041] Specifically, after pickling, if there is no obvious protrusion upon visual inspection and tactile examination after manual inspection, the material can be directly released to the hot rolling pickling process. If there is obvious protrusion upon visual inspection and tactile examination after pickling, the material is sealed off and adjusted to the hot rolling leveling process for secondary processing. If the requirements are met, the material is sent to the hot rolling pickling process. If the requirements are still not met, the material is sealed off again.

[0042] Example: Taking a hot rolling production line in Qian'an as an example, for the roller mark defects automatically identified by the Bestway surface quality inspection system of the production line, the online surface roller mark pickling inspection of the hot rolling process is carried out in accordance with the above-mentioned patented solution.

[0043] From suchFigure 2 The Bestech defect description for non-tailing, folding type roll marks indicates that the rolled steel grade is QS340-P, and the finished product rolling specification is 2.62mm. The defect is 1170mm. The defect classification by Bestway is B-roller print, with a defect level of 5 (the factory uses defect level to represent severity, with higher levels indicating greater severity; level 5 is the highest level, and levels 3 and above are blocked). The roller print defect location information is 1021mm from the operating side and 139mm from the transmission side, with a defect width of 7mm and a defect length of 10mm. The defect is periodic, with a period length of 2229mm. The defect detection surface is on the upper surface.

[0044] Data from the online roll marking and pickling process of the hot rolling inspection line:

[0045] According to the pickling operation steps of this patent, since the roller mark defect is relatively small, the white bright mark appears after only one pickling using the above-mentioned hot rolling online pickling process data. According to manual inspection, there is no obvious protrusion by sight or touch, which meets the requirements of the hot rolling pickling process and can be directly released to the downstream process.

[0046] From such Figure 5 The Bestech defect description for the tailing and folding type roll marks shown indicates that the rolled steel grade is QS340-P, and the finished product rolling specification is 1.99mm. The defect is 1297mm. The defect classification by Bestech is B-roller print, with a defect level of 5 (the factory uses defect level to represent severity, with higher levels indicating greater severity; level 5 is the highest level, and levels 3 and above are blocked). The location information of the roller print defect is 876mm from the operating side and 397mm from the transmission side. The defect width is 12mm and the defect length is 8mm. The defect is periodic with a period length of 2247mm. The defect detection surface is on the upper surface.

[0047] Data from the online roll marking and pickling process of the hot rolling inspection line:

[0048] According to the pickling operation steps of this patent, due to the obvious defects of the roller mark, even after two picklings using the above-mentioned hot rolling online pickling process data, the mark is still a bright brown color. Upon manual inspection, there is a significant amount of raised material that cannot meet the requirements of the hot rolling pickling process. Therefore, a roll replacement and blockage response plan was implemented.

[0049] This application provides an online surface quality inspection and control device for the hot rolling process of pickled steel plates, comprising: Pickling plate acquisition module, used to acquire pickling plates; The original roller print defect inspection module is used to inspect the original roller print defects of the pickled plate. The roller printing defect pickling module is used to perform roller printing defect pickling on the pickling plate according to the roller printing defect inspection results. A pickling post-roller print defect inspection module is used to inspect the pickled plate for pickling post-roller print defects. The roller printing defect processing module is used to process the roller printing defects of the pickled plate according to the inspection results of the roller printing defects after pickling.

[0050] This application provides an online surface quality inspection and control method and device for hot rolling of pickled steel plates. By using manual pickling on the inspection line, the depth of roll mark defects can be effectively determined, improving the accuracy of manual judgment and reducing the roll mark defect closure rate. At the same time, it can accurately determine the subsequent processing flow, reducing the production cost of the entire hot-rolled pickled steel plate rolling process and improving work efficiency.

[0051] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0052] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A method for online surface quality inspection and control in the hot rolling process of pickled steel sheets, characterized in that, The method includes the following steps: Obtain pickled plates; The process of inspecting the pickled plate for original roller marks defects includes the following steps: hot rolling the pickled plate; performing surface quality monitoring on the pickled plate using a surface quality control system (e.g., using a surface quality control system); the surface quality monitoring includes the following steps: determining whether there are roller marks defects on the surface of the pickled plate; if so, assessing the degree of the roller marks defects; if not, conveying the pickled plate to the pickling process for normal production; assessing the degree of the roller marks defects includes the following steps: determining whether the degree of the roller marks defects is lower than a preset level; if so, performing hot rolling online pickling on the pickled plate; if not, sealing the pickled plate. Based on the inspection results of roller printing defects, the pickled plate is subjected to online pickling to remove roller printing defects. The pickled plate is inspected for defects in roller printing after pickling. The pickled plate is treated for roller printing defects based on the inspection results of roller printing defects after pickling. Among them, defective rolls of roller printing are unwound, cut, and inspected on the inspection line according to process requirements to pinpoint the location and cycle of defects. The specific steps are as follows: The uncoiling and cutting length L is greater than twice the maximum roll diameter circumference of the roll. For defects on the lower surface, after uncoiling and cutting, the plate can be directly sent to the No. 1 roller conveyor area for inspection. For defects on the upper surface, the cutting plate needs to be sent from the No. 1 roller conveyor area to the No. 2 roller conveyor area for inspection with the help of the flip arm. When inspecting uncoiled plates, switch the "disable mode" to the machine side box of the uncoiler, roller conveyor, and tilting arm equipment to prevent equipment from malfunctioning. Based on the camera position coordinates of Bestway's defect detection and the distance of the defect from the tail of the strip, the location area of ​​the uncoiled plate defect was initially identified. When inspecting the uncoiled plates, if periodic roll marks are found, perform online pickling on the hot rolling inspection line.

2. The online surface quality inspection and control method for the hot rolling process of pickled steel plates according to claim 1, characterized in that, The determination of the degree of the roller printing defect also includes the following steps: Determine whether the roller printing defect has depth; If so, the roller printing defects shall be manually inspected; If not, the pickling plate is conveyed to the pickling process for normal production.

3. The online surface quality inspection and control method for the hot rolling process of pickled steel plates according to claim 2, characterized in that, The manual inspection of the roller printing defects includes the following steps: Determine whether the roller printing defect can be detected manually; If so, seal the pickled plate and transport it to the leveling process for further processing; If not, the pickling plate is conveyed to the pickling process for normal production.

4. The online surface quality inspection and control method for the hot rolling process of pickled steel plate according to claim 3, characterized in that, After the material is conveyed to the leveling process, the following steps are also included: Determine whether there are roller marks on the surface of the pickled plate; If so, seal the pickled plate; If not, the pickling plate is conveyed to the pickling process for normal production.

5. The online surface quality inspection and control method for the hot rolling process of pickled steel plates according to claim 4, characterized in that, After the pickling plate is conveyed to the normal production stage of the pickling process, the following steps are also included: Determine whether any defects are found on the surface of the pickled plate after pickling; If so, seal the pickled plate; If not, the pickled plate will be delivered to the end customer.

6. The online surface quality inspection and control method for the hot rolling process of pickled steel plates according to claim 5, characterized in that, After the pickled plates are delivered to the end customer, the process further includes the following steps: Determine whether a quality objection should be raised regarding the pickled plate; If so, compensate the customer for quality losses; If no objection is raised, the process ends.

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