A method for automatic steel clamping rolling of a medium plate based on a side guide plate

Abstract

The application discloses a medium plate automatic steel clamping rolling method based on a side guide plate and relates to the technical field of medium plate rolling process optimization and shape control. The medium plate automatic steel clamping rolling method based on the side guide plate comprises the following steps: step 1, HMI parameter pre-setting; step 2, process starting and steel plate centering measurement; step 3, rolling mill steel biting inspection and pass determination; step 4, steel biting side steel clamping control; step 5, steel throwing side steel clamping control; step 6, overload protection control; and step 7, rolling mill steel throwing and pass circulation. The method realizes accurate suppression of the camber defect: through pass determination (odd / even pass), steel biting side and steel throwing side definition and time sequence steel clamping control after 2.5 seconds of rolling mill steel biting and 2.5 seconds of steel biting, continuous restraint of the whole rolling process is formed, the steel plate "oblique rolling" deviation is effectively corrected, the camber problem caused by the lack of the rolling process steel clamping function in the traditional technology is solved from the root cause, and the steel plate running track and the rolling mill center line are kept parallel.

Description

Technical Field

[0001] This invention relates to the field of medium and heavy plate rolling process optimization and plate shape control technology, and in particular to an automatic steel-holding rolling method for medium and heavy plates based on side guide plates. Background Technology

[0002] The side guide plates of medium and heavy plate rolling mills are electromechanical-hydraulic integrated devices that combine centering measurement and positioning guidance functions. Driven by hydraulic cylinders and controlled by servo / proportional valves, they achieve high-precision regulation with displacement and pressure sensors, providing a fundamental guarantee for the steel plate's entry into the rolling mill. However, the core functions of traditional side guide plates are limited to centering before rolling and guiding before biting, lacking automatic clamping constraints after the pass starts, during steel plate biting, and during the rolling process. In actual production, due to factors such as billet specification fluctuations, uneven roller wear, roller slippage, or bite angle deviations, even after initial centering, the steel plate is prone to exhibiting a "skew rolling" phenomenon after biting, where the centerline is not parallel to the mill centerline, leading to camber defects. This problem cannot be effectively solved by the existing functions of traditional side guide plates, ultimately resulting in poor steel plate shape, increased edge shearing loss, and a higher rate of unplanned length changes, severely restricting the improvement of steel plate yield. Summary of the Invention

[0003] The purpose of this invention is to at least solve one of the technical problems existing in the prior art, and to provide an automatic steel-holding rolling method for medium and thick plates based on side guide plates, which can solve the problem of sickle-shaped defects.

[0004] To achieve the above objectives, the present invention provides the following technical solution: an automatic steel-holding rolling method for medium and heavy plates based on side guide plates, comprising: step 1 HMI parameter preset; step 2 process start-up and steel plate centering measurement; step 3 mill steel bite inspection and pass determination; step 4 steel bite side-holding control; step 5 steel discard side-holding control; step 6 overload protection control; and step 7 mill steel discarding and pass cycle. The step 1 HMI parameter preset is as follows: Create an automated steel clamping and rolling HMI (Hardware Interface) operation interface, input key control parameters, and connect them to the PLC program to serve as the core basis for steel clamping and rolling: Automatic closing setting value a for the steel-biting side guide plate: +60~+85mm; Automatic closing setting value b for the steel-throwing side guide plate: +80~+105mm; The side guide plate automatically opens when overloaded, with an additional width setting value c: +180~+230mm.

[0005] Preferably, step 2 involves starting the process and measuring the centering of the steel plate: After the rolling process officially starts, before the medium and heavy plates enter the first pass of the rolling mill, they first arrive at the entrance side guide plate area. The entrance side guide plate immediately starts the centering program, and the centering pressure is monitored in real time by the pressure sensor. After the pressure reaches the standard, the steel plate is accurately centered and positioned. At the same time, with the help of the displacement sensor built into the side guide plate, the actual width W of the steel plate (unit: mm) is measured and recorded. This width value serves as the only width reference value for the subsequent fully automatic steel clamping rolling process, ensuring the accuracy of steel clamping control.

[0006] Preferably, step 3, the rolling mill bite inspection and pass determination, includes: After centering is completed, the rolling mill system automatically starts the steel biting condition check, verifying the key indicators of roller speed, steel plate position, and equipment status one by one. Once all conditions are met, the steel biting sequence is officially started. At this time, the system simultaneously performs pass determination to determine whether the current rolling pass is an odd or even pass, and defines the steel biting side and the steel throwing side based on the determination result: the side of the steel plate that is bitten by the rolling mill is the "steel biting side", and the side that is thrown out by the rolling mill is the "steel throwing side", ensuring that the side guide plate function is accurately matched with the pass requirements.

[0007] Preferably, step 4 involves controlling the steel-gripping side of the steel: 2.5 seconds after the mill starts biting the steel (at which point the roller speed is completely synchronized with the mill biting speed to avoid the side guide plate clamping the steel plate), the width of the biting side guide plate is precisely adjusted according to the pass type. Odd-numbered passes: The inlet side guide plate is the biting side, and its width is set to W+a mm (a ranges from +60 to +85 mm). This width is maintained until the end of this pass. Even-numbered passes: The exit side guide plate is the biting side, and its width is set to W+a mm (a ranges from +60 to +85 mm). This width is maintained until the end of this pass.

[0008] Preferably, step 5 involves controlling the steel throwing and holding process: After the rolling mill completes the steel biting sequence, it enters the steel-bearing sequence. 2.5 seconds later, the system starts the steel throwing side steel-holding control and adjusts the width of the steel throwing side guide plate according to the pass type. Odd-numbered passes: The exit side guide plate is the steel-throwing side, and its width is set to W+b mm (b ranges from +80 to +105 mm). This width is maintained until the end of this pass. Even-numbered passes: The inlet side guide plate is the steel-throwing side, and its width is set to W+b mm (b ranges from +80 to +105 mm). This width is maintained until the end of this pass.

[0009] Preferably, step 6 involves overload protection control: Throughout the rolling process, pressure sensors continuously monitor the steel clamping pressure on both guide plates in real time. When the pressure on either guide plate exceeds the overload protection setting, the system immediately triggers the overload protection mechanism and cuts off the automatic steel clamping function for this pass. Both guide plates open simultaneously to a safe width of W+c mm (c ranges from +180 to +230 mm) to prevent damage to the side guide plates due to overload impact and ensure stable operation of the equipment.

[0010] Preferably, step 7 involves the rolling mill's steel removal and pass cycle: After the rolling mill completes the steel-bearing sequence, the steel plate is successfully ejected, and the rolling of this pass is officially completed. At this time, the system automatically determines whether the current pass is the last pass. If the answer is "No", the process will automatically proceed to the next rolling process, repeating the operation logic of steps three to six, redefining the bite side, the ejection side and the corresponding width settings according to the parity of the new pass, and repeating the cycle. If the answer is "yes", then the entire automatic steel-holding rolling process for medium and heavy plates based on side guide plates is successfully completed, and the steel plate has completed all rolling passes.

[0011] Compared with the prior art, the beneficial effects of the present invention are: 1. This automatic steel-holding rolling method for medium and heavy plates based on side guide plates achieves precise suppression of camber defects: through process-oriented pass determination (odd / even passes), definition of the steel-biting side and the steel-throwing side, and time-sequential steel-holding control after the mill bites the steel for 2.5 seconds and after the steel is held for 2.5 seconds, a continuous bundle is formed throughout the entire rolling process, effectively correcting the "skew rolling" deviation of the steel plate. This fundamentally solves the camber problem caused by the lack of steel-holding function in the rolling process in traditional technology, ensuring that the running trajectory of the steel plate remains parallel to the center line of the mill.

[0012] 2. This automatic steel-gripping rolling method for medium and heavy plates based on side guide plates significantly improves plate shape and yield: the stable steel-gripping bundles ensure uniform stress and smooth operation of the steel plate during rolling, greatly improving plate shape accuracy; at the same time, it reduces the amount of edge shearing and unplanned length caused by camber defects, directly improving the steel plate yield and creating considerable economic benefits for the production process.

[0013] 3. The automatic steel-holding rolling method for medium and heavy plates based on side guide plates achieves comprehensive protection of equipment operation safety: real-time pressure monitoring and overload protection mechanism throughout the process can quickly cut off the steel-holding function and open the safety width (W+c mm) when the pressure of the side guide plate exceeds the threshold, so as to avoid damage or detachment of the side guide plate due to overload impact, extend the service life of the equipment, reduce maintenance costs, and ensure the continuous and stable rolling process.

[0014] 4. This automatic steel-holding rolling method for medium and heavy plates based on side guide plates achieves outstanding adaptability and flexibility: the wide range of parameters preset by the HMI (a: +60~+85mm, b: +80~+105mm, c: +180~+230mm) can flexibly match the rolling requirements of medium and heavy plates of different thicknesses and specifications. It can be adapted to various medium and heavy plate rolling mill projects without adjusting the equipment structure, thus improving the universality of technology application. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a flowchart of the automatic steel-holding rolling process for the side guide plate of the medium-thick plate rolling mill according to the present invention; Detailed Implementation

[0016] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0017] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0018] In the description of this invention, terms such as greater than, less than, and exceeding are understood to exclude the stated number, while terms such as above, below, and within are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0019] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0020] Please see Figure 1 This invention provides a technical solution: an automatic steel-holding rolling method for medium-thick plates based on side guide plates, comprising the following steps; Step 1: HMI parameter preset: Create an automated steel clamping and rolling HMI (Hardware Interface) operation interface, input key control parameters, and connect them to the PLC program to serve as the core basis for steel clamping and rolling: Automatic closing setting value a for the steel clamping side guide plate: +60~+85mm; (adapts to clamping requirements of steel plates of different thicknesses) Automatic closing setting value b for the steel-throwing side guide plate: +80~+105mm; (matching the ductility characteristics during steel plate rolling). The side guide plate automatically opens under overload with an additional width setting c: +180~+230mm; (redundant width to ensure equipment safety). Step 2: Process start and steel plate alignment measurement: After the rolling process is officially started, before the medium and heavy plate enters the first pass of the rolling mill, it first arrives at the entrance side guide plate area. The entrance side guide plate immediately starts the centering program and monitors the centering pressure in real time through pressure sensors. After the pressure reaches the standard, the steel plate is accurately centered and positioned. At the same time, with the help of the displacement sensor built into the side guide plate, the actual width W (unit: mm) of the steel plate is measured and recorded. This width value serves as the only width reference value for the subsequent fully automatic steel clamping rolling process, ensuring the accuracy of steel clamping control. Step 3: Rolling Mill Biting Inspection and Pass Determination After centering is completed, the rolling mill system automatically starts the steel biting condition check, verifying the key indicators of roller speed, steel plate position, and equipment status one by one. Once all conditions are met, the steel biting sequence is officially started. At this time, the system simultaneously performs pass determination to determine whether the current rolling pass is an odd or even pass, and defines the steel biting side and the steel throwing side based on the determination result: the side of the steel plate that is bitten by the rolling mill is the "steel biting side", and the side that is thrown out by the rolling mill is the "steel throwing side", ensuring that the side guide plate function and the pass requirements are accurately matched. Step 4: Steel biting and gripping control (2.5 seconds after the rolling mill bites the steel) 2.5 seconds after the mill starts biting the steel (at which point the roller speed is completely synchronized with the mill biting speed to avoid the side guide plate clamping the steel plate), the width of the biting side guide plate is precisely adjusted according to the pass type. Odd-numbered passes: The inlet side guide plate is the biting side, and its width is set to W+a mm (a ranges from +60 to +85 mm). This width is maintained until the end of this pass. Even-numbered passes: The exit side guide plate is the biting side, and its width is set to W+a mm (a ranges from +60 to +85 mm). This width is maintained until the end of this pass. Step 5: Steel throwing and side-holding control (2.5 seconds after the rolling mill holds the steel) After the rolling mill completes the steel biting sequence, it enters the steel-bearing sequence. 2.5 seconds later, the system starts the steel throwing side steel-holding control and adjusts the width of the steel throwing side guide plate according to the pass type. Odd-numbered passes: The exit side guide plate is the steel-throwing side, and its width is set to W+b mm (b ranges from +80 to +105 mm). This width is maintained until the end of this pass. Even-numbered passes: The inlet side guide plate is the steel-throwing side, and its width is set to W+b mm (b ranges from +80 to +105 mm). This width is maintained until the end of this pass. Step 6: Overload Protection Control (Real-time Monitoring Throughout the Entire Process) Throughout the rolling process, pressure sensors continuously monitor the steel clamping pressure on both guide plates in real time. When the pressure on either guide plate exceeds the overload protection setting, the system immediately triggers the overload protection mechanism and cuts off the automatic steel clamping function for this pass. Both side guide plates open simultaneously to a safe width of W+c mm (c ranges from +180 to +230 mm) to prevent damage to the side guide plates due to overload impact and ensure stable operation of the equipment; Step 7: Rolling mill steel removal and pass cycle (until the last pass ends). After the rolling mill completes the steel-bearing sequence, the steel plate is successfully ejected, and the rolling of this pass is officially completed. At this time, the system automatically determines whether the current pass is the last pass. If the answer is "No", the process will automatically proceed to the next rolling process, repeating the operation logic of steps three to six, redefining the bite side, the ejection side and the corresponding width settings according to the parity of the new pass, and repeating the cycle. If the answer is "yes", then the entire automatic steel-holding rolling process for medium and heavy plates based on side guide plates is successfully completed, and the steel plate has completed all rolling passes. Furthermore, this method achieves precise suppression of camber defects: through process-oriented pass determination (odd / even passes), definition of the biting side and the throwing side, and time-sequential steel gripping control after 2.5 seconds of steel biting and 2.5 seconds of steel holding, a continuous bundle is formed throughout the entire rolling process, effectively correcting the "skew rolling" deviation of the steel plate. This fundamentally solves the camber problem caused by the lack of steel gripping function in the rolling process in traditional technology, ensuring that the running trajectory of the steel plate remains parallel to the center line of the rolling mill. Furthermore, this method significantly improves plate shape and increases yield: the stable steel clamping bundles ensure uniform stress and smooth operation of the steel plate during rolling, greatly improving plate shape accuracy; at the same time, it reduces the amount of edge shearing and unplanned length caused by camber defects, directly increasing the steel plate yield and creating considerable economic benefits for the production process. Furthermore, this method achieves comprehensive protection of equipment operation safety: real-time pressure monitoring throughout the entire process is combined with an overload protection mechanism. When the pressure of the side guide plate exceeds the threshold, the steel clamping function can be quickly cut off and the safety width (W+c mm) can be opened to prevent the side guide plate from being damaged or falling off due to overload impact, thereby extending the service life of the equipment, reducing maintenance costs, and ensuring the continuous and stable rolling process. Furthermore, this method achieves outstanding adaptability and flexibility: the wide range of parameters preset by the HMI (a: +60~+85mm, b: +80~+105mm, c: +180~+230mm) can flexibly match the rolling requirements of medium and heavy plates of different thicknesses and specifications. It can be adapted to various medium and heavy plate rolling mill projects without adjusting the equipment structure, thus improving the universality of the technology application.

[0021] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. An automatic steel-holding rolling method for medium and heavy plates based on side guide plates, comprising: step 1 HMI parameter preset, step 2 process start-up and steel plate centering measurement, step 3 mill bite inspection and pass determination, step 4 bite side steel-holding control, step 5 discard side steel-holding control, step 6 overload protection control, and step 7 mill discard and pass cycle, characterized in that: The HMI parameters are preset in step 1: Create an automated steel clamping and rolling HMI (Hardware Interface) operation interface, input key control parameters, and connect them to the PLC program to serve as the core basis for steel clamping and rolling: Automatic closing setting value a for the steel-biting side guide plate: +60~+85mm; Automatic closing setting value b for the steel-throwing side guide plate: +80~+105mm; The side guide plate automatically opens when overloaded, with an additional width setting value c: +180~+230mm.

2. The automatic steel-holding rolling method for medium-thick plates based on side guide plates according to claim 1, characterized in that: Step 2 involves initiating the process and measuring the alignment of the steel plate: After the rolling process officially starts, before the medium and heavy plates enter the first pass of the rolling mill, they first arrive at the entrance side guide plate area. The entrance side guide plate immediately starts the centering program, and the centering pressure is monitored in real time by the pressure sensor. After the pressure reaches the standard, the steel plate is accurately centered and positioned. At the same time, with the help of the displacement sensor built into the side guide plate, the actual width W of the steel plate (unit: mm) is measured and recorded. This width value serves as the only width reference value for the subsequent fully automatic steel clamping rolling process, ensuring the accuracy of steel clamping control.

3. The automatic steel-holding rolling method for medium-thick plates based on side guide plates according to claim 1, characterized in that: Step 3: Rolling mill bite inspection and pass determination: After centering is completed, the rolling mill system automatically starts the steel biting condition check, verifying the key indicators of roller speed, steel plate position, and equipment status one by one. Once all conditions are met, the steel biting sequence is officially started. At this time, the system simultaneously performs pass determination to determine whether the current rolling pass is an odd or even pass, and defines the biting side and the throwing side based on the determination result: the side of the steel plate that is bitten by the rolling mill is the "biting side", and the side that is thrown out by the rolling mill is the "throwing side", ensuring that the side guide plate function is accurately matched with the pass requirements.

4. The automatic steel-holding rolling method for medium-thick plates based on side guide plates according to claim 1, characterized in that: Step 4, steel-biting and steel-holding control: 2.5 seconds after the mill starts biting the steel (at which point the roller speed is completely synchronized with the mill biting speed to avoid the side guide plate clamping the steel plate), the width of the biting side guide plate is precisely adjusted according to the pass type. Odd-numbered passes: The inlet side guide plate is the biting side, and its width is set to W+a mm (a ranges from +60 to +85 mm). This width is maintained until the end of this pass. Even-numbered passes: The exit side guide plate is the biting side, and its width is set to W+a mm (a ranges from +60 to +85 mm). This width is maintained until the end of this pass.

5. The automatic steel-holding rolling method for medium-thick plates based on side guide plates according to claim 1, characterized in that: Step 5: Steel throwing side steel clamping control: After the rolling mill completes the steel biting sequence, it enters the steel holding sequence. 2.5 seconds later, the system starts the steel throwing side steel holding control and adjusts the width of the steel throwing side guide plate according to the pass type. Odd-numbered passes: The exit side guide plate is the steel-throwing side, and its width is set to W+b mm (b ranges from +80 to +105 mm). This width is maintained until the end of this pass. Even-numbered passes: The inlet side guide plate is the steel-throwing side, and its width is set to W+b mm (b ranges from +80 to +105 mm). This width is maintained until the end of this pass.

6. The automatic steel-holding rolling method for medium-thick plates based on side guide plates according to claim 1, characterized in that: Step 6: Overload protection control: Throughout the rolling process, pressure sensors continuously monitor the steel clamping pressure on both guide plates in real time. When the pressure on either guide plate exceeds the overload protection setting, the system immediately triggers the overload protection mechanism and cuts off the automatic steel clamping function for this pass. Both guide plates open simultaneously to a safe width of W+c mm (c ranges from +180 to +230 mm) to prevent damage to the side guide plates due to overload impact and ensure stable operation of the equipment.

7. The automatic steel-holding rolling method for medium-thick plates based on side guide plates according to claim 1, characterized in that: Step 7: Rolling mill steel removal and pass cycle: After the rolling mill completes the steel-bearing sequence, the steel plate is successfully ejected, and the rolling of this pass is officially completed. At this time, the system automatically determines whether the current pass is the last pass. If the answer is "No", the process will automatically proceed to the next rolling process, repeating the operation logic of steps three to six, redefining the bite side, the ejection side and the corresponding width settings according to the parity of the new pass, and repeating the cycle. If the answer is "yes", then the entire automatic steel-holding rolling process for medium and heavy plates based on side guide plates is successfully completed, and the steel plate has completed all rolling passes.

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