A monitoring and inhibiting method for the buckling head of a medium plate

Abstract

The present application relates to a kind of monitoring and inhibiting methods for middle plate buckling head, comprising: S1: by visual monitoring device, the highest height m of head deflection after middle plate is completed rolling, deflection length L and the deflection angle θ formed by the middle plate and transmission roller way;S2: when the highest height m of head deflection of the middle plate≤50mm, the middle plate is sent into pre-straightening machine and is straightened once;When the highest height m of head deflection of the middle plate>50mm, the middle plate is sent into pre-straightening machine and is "Z" shape back straightening.Utilize visual monitoring device to monitor buckling head condition in real time, by the related data of buckling head monitored, judge whether "Z" shape back straightening is carried out, and in "Z" shape back straightening process, with middle plate reaches pre-straightening machine L / 2, as "Z" shape back straightening turning point, significantly improve the production efficiency of plate, improve product yield, simultaneously avoid straightening long, influence open cold time.

Description

Technical Field

[0001] This invention relates to the field of metallurgical industry technology, and in particular to a method for monitoring and suppressing the warping of medium and heavy plates. Background Technology

[0002] In the production of medium and heavy plates, under normal conditions, after the steel plate is rolled by the rolling mill, it enters the pre-straightening machine, and after leveling, it enters the ultra-fast cooling machine. The starting temperature of the cooling machine is a key factor.

[0003] However, when warping occurs in the final rolling pass, preheating straightening requires opening the roll gaps that allow the steel plate to pass through to perform a re-straightening operation to mitigate the warping. This re-straightening operation is typically performed manually, and the size of the roll gaps needs to be calculated manually. The entire re-straightening process is time-consuming, significantly impacting the critical process execution point of the initial cooling temperature.

[0004] Meanwhile, during the rolling process, the operators cannot immediately observe the warping of the steel plate. Summary of the Invention

[0005] The purpose of this invention is to provide a method for monitoring and suppressing warping of medium and heavy plates, which effectively controls the warping of medium and heavy plates during the rolling process.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] This invention provides a method for monitoring and suppressing the warping of buckles in medium-thick plates, comprising the following steps:

[0008] S1: Monitor the maximum head deflection height m, deflection length L, and deflection angle θ formed by the medium-thick plate and the conveyor roller after rolling by a visual monitoring device.

[0009] S2: When the maximum head deflection height m of the medium-thick plate is less than or equal to 50 mm, the medium-thick plate is sent to the pre-straightening machine for one straightening; when the maximum head deflection height m of the medium-thick plate is greater than 50 mm, the medium-thick plate is sent to the pre-straightening machine for "Z" shaped back straightening.

[0010] The "Z"-shaped correction includes the following steps:

[0011] (1) Adjust the gap between the straightening rollers of the pre-straightening machine to (m+50)mm;

[0012] (2) The medium-thick plate is fed into the pre-straightening machine in step (1). When the head of the medium-thick plate reaches the center position L / 2 of the pre-straightening machine, the straightening roller gap of the pre-straightening machine in step (1) is pressed down until the initial straightening roller gap size is reached. Then the medium-thick plate is withdrawn from the pre-straightening machine.

[0013] (3) The medium-thick plate that has been straightened in step (2) is sent back into the pre-straightening machine for secondary straightening, thus completing the “Z” shaped back straightening.

[0014] Furthermore, in step S1, the visual monitoring device is installed on the side of the transfer roller table between the rolling mill and the pre-straightening machine.

[0015] Furthermore, when three or more consecutive medium-thick plates are detected to have warped heads, the odd-numbered rolling passes in the rolling process are reduced by one, the rolling reduction of the remaining rolling passes is increased simultaneously, and the medium-thick plate is allowed to pass through the last reduced rolling pass without any rolling, i.e., the even-numbered passes are used to produce the finished product.

[0016] Furthermore, when the thickness of the medium-thick plate is >50mm, it is only necessary to monitor the maximum head deflection height m after the medium-thick plate has completed rolling.

[0017] Furthermore, when the thickness of the medium-thick plate is ≤50mm, if the deflection angle θ formed by the medium-thick plate and the conveyor roller is >30° during monitoring, the visual monitoring device will issue a high degree of warping alarm.

[0018] Furthermore, after the medium-thick plate is rolled and straightened in sequence, the medium-thick plate is also rapidly cooled.

[0019] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0020] This invention uses a visual monitoring device to monitor the warping of the rolled-out heads of medium and heavy plates in real time, and obtains the corresponding data on the maximum head deflection height m, deflection length L, and the deflection angle θ formed between the medium and heavy plates and the conveyor rollers. Based on the obtained data, warping is suppressed, thereby improving the yield of medium and heavy plate production. Attached Figure Description

[0021] The following sections will describe some specific embodiments of the invention in detail by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or portions. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0022] Figure 1 This is a schematic diagram of the maximum deflection height m, deflection length L, and deflection angle θ formed by the medium-thick plate and the conveyor roller in the monitoring and suppression method for the warping of medium-thick plates of the present invention.

[0023] Figure 2 This is a process flow diagram (I) of a method for monitoring and suppressing warping of medium-thick plates according to the present invention.

[0024] Figure 3 This is a flowchart (II) of the process flow of a method for monitoring and suppressing warping of medium-thick plates according to the present invention. Detailed Implementation

[0025] The technical solution of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] The method for monitoring and suppressing warping of medium-thick plates provided in this invention includes the following steps:

[0027] S1: Monitor the maximum head deflection height m, deflection length L, and deflection angle θ formed between the medium-thick plate and the conveyor roller after rolling using a visual monitoring device (see...). Figure 1 (as shown)

[0028] S2: When the highest head deflection height m of the medium-thick plate is ≤ 50mm, the medium-thick plate is sent to the pre-straightening machine for one straightening; when the highest head deflection height m of the medium-thick plate is > 50mm, the medium-thick plate is sent to the pre-straightening machine for "Z" shaped back straightening.

[0029] Specifically, in existing technologies, the rolling production of steel plates includes rolling, straightening, and rapid cooling processes. In this embodiment of the invention, the visual monitoring device set in step S1 is located on the side of the transfer roller table between the rolling mill and the pre-straightening mill, used to monitor relevant data when the medium-thick plate develops a warp head after rolling. This visual monitoring device is connected to the control signals of both the rolling mill and the pre-straightening mill, and by feeding back the monitored data to the rolling mill and the pre-straightening mill, a mechanism to suppress warp head formation is established.

[0030] Specifically, regarding the aforementioned suppression mechanism, when the visual monitoring device detects that the maximum head deflection height m of the aforementioned medium-thick plate is ≤ 50mm, meaning the detected maximum head deflection height m of the medium-thick plate is within a controllable range, the medium-thick plate can be directly sent to the pre-straightening machine for one straightening operation without any additional processing. However, when the visual monitoring device detects that the maximum head deflection height m of the aforementioned medium-thick plate is > 50mm, the medium-thick plate needs to be sent to the pre-straightening machine for "Z"-shaped back straightening. Furthermore, it should be noted that during the transfer of the medium-thick plate from the rolling mill to the pre-straightening machine, instability in height detection due to the plate surface slapping against the transfer rollers is inevitable. When this occurs, the highest detected point is taken as the warpage height value.

[0031] Regarding the aforementioned "Z"-shaped straightening, the so-called "Z"-shaped straightening involves using a medium-thick plate to perform back-and-forth straightening on a pre-straightening machine to eliminate the warping phenomenon. For details, please refer to... Figure 2 and Figure 3 When the visual monitoring device detects that the maximum deflection height (m) of the aforementioned medium-thick plate's head exceeds 50mm, it sends a signal to the control end of the pre-straightening machine. The pre-straightening machine then adjusts the gap between the straightening rollers to (m+50)mm to ensure the safe entry of the medium-thick plate, which has already developed a warped head. When the head of the medium-thick plate reaches L / 2 of the pre-straightening machine, the machine presses down the gap between the straightening rollers back to its initial state. This downward pressure of the straightening roller gap pre-treats the warped head of the medium-thick plate.

[0032] After the pressing of the straightening roller gap is completed, the medium-thick plate is then retracted from the pre-straightening machine. After the medium-thick plate is completely retracted from the machine, it is sent back into the pre-straightening machine for secondary straightening, thus completing the so-called "Z"-shaped retraction straightening.

[0033] The reason why the medium-thick plate is retracted from the pre-straightener when it reaches L / 2 of the pre-straightener is that after rolling and straightening, the medium-thick plate needs rapid cooling, and the initial cooling temperature is a key control factor affecting the microstructure transformation of the plate. The initial cooling temperature directly affects the processing performance, microstructure, and final product performance of the plate, so it needs to be strictly controlled. To avoid the initial cooling temperature affecting the product defect rate, in this embodiment of the invention, the medium-thick plate is retracted when it reaches L / 2 of the pre-straightener.

[0034] In this embodiment of the invention, when the aforementioned visual monitoring device detects three or more consecutive instances of warping at the top of the medium-thick plate, the device will issue an alarm. At this point, the continuous warping phenomenon can be resolved by adjusting the relevant operational details in the rolling process. Specifically, in this embodiment, the number of odd-numbered rolling passes in the original rolling process is reduced by one, and the reduction amount of the remaining rolling passes is simultaneously increased. After the medium-thick plate is rolled in the rolling pass with the increased reduction amount, it passes through the reduced rolling pass without warping, causing the warping at the top of the medium-thick plate to shift from the head to the tail. Thus, by adjusting the corresponding operational details in the rolling process, the head of the medium-thick plate can smoothly enter the pre-straightening machine, while the warping at the tail is straightened by the pre-straightening machine. The specific reduction amount of each rolling pass is rationally arranged according to the thickness of the medium-thick plate and actual production needs.

[0035] Furthermore, in this embodiment of the invention, when the thickness of the medium-thick plate is >50mm, it is only necessary to monitor the maximum head deflection height m after the medium-thick plate has completed rolling, and the deflection height m can be directly controlled. However, when the thickness of the medium-thick plate is ≤50mm, if the deflection angle θ formed by the medium-thick plate and the conveyor roller is >30° during monitoring, the visual monitoring device will issue a high degree of warping alarm to remind the operator to intervene.

[0036] In summary, the present invention provides a method for monitoring and suppressing warping of medium-thick plates. This method utilizes a visual monitoring device to monitor warping in real time. Based on the monitored warping data, it determines whether to perform "Z"-shaped re-correction. Furthermore, during the "Z"-shaped re-correction process, the turning point is defined as when the medium-thick plate reaches L / 2 of the pre-straightening machine. This significantly improves the production efficiency of the plate, increases the product yield, and simultaneously avoids excessive straightening time, which could affect the timing of cooling.

[0037] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A method for monitoring and suppressing warping of the buckle head in medium-thick plates, characterized in that, Includes the following steps: S1: Monitor the maximum head deflection height m, deflection length L, and deflection angle θ formed by the medium-thick plate and the conveyor roller after rolling by a visual monitoring device. S2: When the maximum head deflection height m of the medium-thick plate is less than or equal to 50 mm, the medium-thick plate is sent to the pre-straightening machine for one straightening; when the maximum head deflection height m of the medium-thick plate is greater than 50 mm, the medium-thick plate is sent to the pre-straightening machine for "Z" shaped back straightening. The "Z"-shaped correction includes the following steps: (1) Adjust the gap between the straightening rollers of the pre-straightening machine to (m+50)mm; (2) The medium-thick plate is fed into the pre-straightening machine in step (1). When the head of the medium-thick plate reaches the center position of the pre-straightening machine, the straightening roller gap of the pre-straightening machine in step (1) is pressed down until the initial straightening roller gap size is reached. Then the medium-thick plate is withdrawn from the pre-straightening machine. (3) The medium-thick plate that has been straightened in step (2) is sent back into the pre-straightening machine for secondary straightening, thus completing the "Z" shaped back straightening.

2. The method for monitoring and suppressing warping of medium-thick plate buckles according to claim 1, characterized in that, In step S1, the visual monitoring device is installed on the side of the transfer roller table between the rolling mill and the pre-straightening machine.

3. The method for monitoring and suppressing warping of medium-thick plate buckles according to claim 1, characterized in that, When three or more consecutive medium-thick plates are detected to have warped heads, the odd-numbered rolling passes in the rolling process are reduced by one, the rolling reduction of the remaining rolling passes is increased simultaneously, and the medium-thick plate is allowed to pass through the last reduced rolling pass without rolling.

4. The method for monitoring and suppressing warping of medium-thick plate buckles according to claim 1, characterized in that, When the thickness of the medium-thick plate is >50mm, it is only necessary to monitor the maximum head deflection height m after the medium-thick plate has been rolled.

5. The method for monitoring and suppressing warping of medium-thick plate buckles according to claim 1, characterized in that, When the thickness of the medium-thick plate is ≤50mm, if the deflection angle θ formed by the medium-thick plate and the conveyor roller is >30° during monitoring, the visual monitoring device will issue a high degree of warping alarm.

6. The method for monitoring and suppressing warping of medium-thick plate buckles according to claim 1, characterized in that, After the medium-thick plate is rolled and straightened in sequence, the process also includes rapid cooling of the medium-thick plate.

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