A method for correcting the elevation of rolling mill line based on the wear data of stand rollers

Abstract

The present invention discloses a method for correcting the rolling line elevation of a rolling mill based on the wear data of the frame rollers. The method comprises: setting a frame roller wear monitoring module, in which the wear data records of the frame rollers of the rolling mill are stored; when the frame rollers are updated, the equipment management system sends the data information to the frame roller wear monitoring module, and the frame roller wear monitoring module updates and resets the stored wear data records according to the received new data information of the frame rollers; after each rolling pass, the wear data records stored in the frame roller wear monitoring module are updated according to the wear data of the frame rollers; before each rolling pass, the corrected rolling line elevation is determined according to the wear data records in the frame roller wear monitoring module and the calibrated rolling line elevation of the rolling mill. The method of the present invention reduces the influence of the frame roller wear on the rolling line elevation of the rolling mill, avoids the phenomenon of steel plate buckling, does not require human intervention, and reduces manpower expenditure.

Description

Technical Field

[0001] The invention relates to a rolling mill control method, in particular to a rolling mill rolling line elevation correction method based on stand roller wear data. Background Art

[0002] In the steel rolling production line, during the plate rolling process, the rolling line elevation needs to be set for the rolling mill. In particular, for some finishing mills, in order to ensure the final quality of the finished product, the rolling line elevation needs to be set accurately for the finishing mill.

[0003] See also Figure 1 and Figure 2 , Figure 1 and Figure 2 The figure shows the state of the steel plate being rolled by the finishing mill of a steel company's thick plate production line. When the rolling mill 1 rolls the steel plate 2, the upper roll surface of the lower roll 11 of the rolling mill 1 needs to be higher than the frame roll 12 by a certain height. The higher height is called the rolling line elevation, as indicated by the double arrow A in the figure. If the rolling mill 1 rolls down the steel plate 2 by Δh in one pass, the rolling line elevation should be determined as Δh / 2, so that the rolled steel plate 2 is relatively flat, as shown in FIG. Figure 1 If the rolling line elevation is higher than Δh / 2, the steel plate 2 is prone to buckling. Figure 2 As shown, the buckling phenomenon will have an adverse effect on the quality of the rolled steel plate 2. Therefore, in order to ensure that the rolled steel plate 2 is as flat as possible, it is necessary to set a suitable rolling line elevation for the rolling mill 1 to prevent the buckling phenomenon from occurring on the rolled steel plate 2.

[0004] The rolling mill 1 includes a press-down device, a rolling line elevation adjustment device, etc. (not shown in the figure). The press-down device is responsible for controlling the distance between the upper and lower rolls during the rolling process. The press-down device is composed of an electric press-down device (EGC) and a roll hydraulic device (HGC). The electric press-down device is responsible for long-distance roll gap adjustment, while the roll hydraulic device is responsible for short-distance roll gap fine adjustment. The rolling line elevation adjustment device is used to compensate for the grinding amount of the lower roll 11 diameter, usually in the form of step pad adjustment. This adjustment device can only be adjusted during equipment maintenance and repair, and cannot be adjusted immediately during normal production.

[0005] If the roller hydraulic device is installed at the lower roller 11, the roller hydraulic device can also be used to perform fine adjustment of the rolling line elevation. The rolling line elevation adjustment method using the roller hydraulic device can achieve instant adjustment during the production process.

[0006] Before each rolling pass, the rolling mill control system controls the rolling mill 1 to adjust the roll gap, which also includes controlling the roll hydraulic device of the lower roll 11 to drive the lower roll 11 to adjust its height.

[0007] A hydraulic stroke calculation module is provided in the rolling mill control system. Before the roller hydraulic device of the lower roller 11 is adjusted, the hydraulic stroke calculation module will calculate the action stroke of the roller hydraulic device. Then the rolling mill control system controls the roller hydraulic device to drive the lower roller 11 to move according to the calculation result of the hydraulic stroke calculation module. In the calculation process of the hydraulic stroke calculation module, multiple process goals need to be taken into account, and determining the appropriate rolling line elevation is one of the goals. Specifically, the hydraulic stroke calculation module requires an elevation parameter as one of the input parameters, the purpose is to make the roller hydraulic device of the lower roller 11 take into account the adjustment of the rolling line elevation while adjusting the roll gap, so that the actual rolling line elevation approaches the elevation parameter. In the current technical solution, the calibrated rolling line elevation of the rolling mill is input as the elevation parameter into the hydraulic stroke calculation module for calculation. After the roller hydraulic device of the lower roller 11 is adjusted through the roll gap, the actual rolling line elevation of the rolling mill 1 approaches the calibrated rolling line elevation.

[0008] The calibrated rolling line elevation is calibrated by the rolling mill control system according to the designed rolling line elevation. This calibration process is usually carried out when large-scale equipment is shut down for maintenance. That is to say, during normal production, the value of the calibrated rolling line elevation is fixed.

[0009] After the new stand roller 12 is put into operation, in the initial period after the rolling line elevation is calibrated, the actual rolling line elevation of the rolling mill 1 is not much different from the designed rolling line elevation, which basically meets the design standards. However, in the actual production process, the stand rollers 12 before and after the rolling mill 1 will wear out as the working time increases. Since the rolling line elevation is based on the stand roller 12, after the stand roller 12 wears out, the benchmark of the rolling line elevation will also change. If the calibrated rolling line elevation of the rolling mill 1 is still used as the elevation parameter and input into the hydraulic stroke calculation module to participate in the calculation of the roller hydraulic device action stroke, the actual rolling line elevation of the rolling mill 1 after adjustment will be greater than the designed rolling line elevation, causing the steel plate 2 after rolling by the rolling mill 1 to buckle. In addition, after the repaired stand roller is put into operation, since the initial roller diameter is smaller than the standard roller body diameter, a large deviation will occur between the actual rolling line elevation of the rolling mill 1 and the designed rolling line elevation, which will also cause the steel plate 2 to buckle.

[0010] At present, the most common way to deal with the buckling phenomenon of the steel plate 2 during rolling is to control the speed difference between the upper and lower rollers of the rolling mill 1. Specifically, the speed of the lower roller 11 is increased, thereby increasing the extension of the lower surface of the steel plate 2 to achieve the purpose of suppressing the buckling. However, the speed difference control correction ability is limited. When the steel plate 2 has already buckled visually, it is difficult to completely eliminate the bad plate shape of the head of the steel plate 2 in the subsequent rolling passes by relying on the speed difference control.

[0011] A Chinese patent (CN201710957047.0) discloses a rolling line adjustment control method for a full six-roller cold rolling mill stand, which discloses the use of a combination of a coarse adjustment step pad and a fine adjustment wedge to adjust the height of the rolling line. However, this rolling line adjustment method is a static adjustment method, which can only be adjusted in the preparation stage before the rolling mill production or during the rolling mill calibration process, rather than real-time automatic adjustment during the rolling mill production. Summary of the invention

[0012] The purpose of the present invention is to provide a rolling line elevation correction method for a rolling mill based on frame roller wear data. The rolling line elevation correction method can effectively reduce the influence of frame roller wear on the rolling line elevation of the rolling mill, avoid the buckling phenomenon that occurs when the rolling mill rolls steel plates, and does not require human intervention, thereby reducing manpower investment and improving production efficiency.

[0013] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0014] A method for correcting the elevation of a rolling mill line based on stand roller wear data comprises the following steps:

[0015] Step 1, setting a frame roller wear monitoring module, wherein the frame roller wear monitoring module is data-connected with the equipment management system, and the frame roller wear monitoring module is data-connected with the rolling mill control system; the frame roller wear monitoring module stores wear data records of the rolling mill frame roller;

[0016] Step 2: When the rack roller is updated, the updated data information of the new rack roller is input into the equipment management system, and the equipment management system sends the new data information of the rack roller to the rack roller wear monitoring module, and the rack roller wear monitoring module updates and resets the stored wear data record according to the received new data information of the rack roller;

[0017] Step 3, after each rolling pass, the frame roller wear monitoring module calculates the wear data of the frame roller in the roller table of the rolling working section, and then updates the wear data record stored in the frame roller wear monitoring module according to the wear data;

[0018] Step 4: before each rolling pass, determine the corrected rolling line elevation according to the wear data recorded in the stand roller wear monitoring module and in combination with the calibrated rolling line elevation of the rolling mill.

[0019] Furthermore, the wear data record of the rolling mill stand roller stored in the stand roller wear monitoring module includes the stand roller number, the initial radius of the upper line and the wear value.

[0020] Furthermore, in step 2, the data information of the new frame roller includes the frame roller number and roller diameter of the new frame roller; when the frame roller wear monitoring module updates and resets the stored wear data record, the frame roller number is first used as a keyword to retrieve the wear data record of the corresponding frame roller in the frame roller wear monitoring module, and then the upper line initial radius in the wear data record is updated according to the roller diameter of the new frame roller, and the wear value in the wear data record is reset to 0.

[0021] Furthermore, the step 3 includes the following sub-steps:

[0022] Step 3.1, after each rolling pass, the stand roller wear monitoring module obtains the rolling mill operation data from the rolling mill control system;

[0023] Step 3.2, determining the rolling section roller of the rolling mill according to the rolling mill operation data;

[0024] Step 3.3, for each stand roller in the rolling section roller table, read the corresponding wear data record in the stand roller wear monitoring module, add the wear value in the wear data record to the single-pass wear value to obtain a new wear value, and update the wear value in the wear data record to the new wear value.

[0025] Furthermore, the step 4 includes the following sub-steps:

[0026] Step 4.1, for each stand roller at the rolling inlet side, reading the corresponding wear data record in the stand roller wear monitoring module;

[0027] Step 4.2, for each stand roller on the rolling inlet side, add the upper line initial radius in the wear data record to the wear value to obtain the roller body radius after wear, and then subtract the roller body radius after wear from the standard roller body radius to obtain the wear offset value;

[0028] Step 4.3, selecting the minimum value among all the wear offset values ​​obtained as the elevation correction offset value;

[0029] Step 4.4, the corrected rolling line elevation is obtained by subtracting the elevation correction offset value from the calibrated rolling line elevation of the rolling mill.

[0030] The rolling line elevation correction method of the present invention provides a frame roller wear monitoring module for recording the wear data of the rolling mill frame rollers, in which the wear data records of all the frame rollers are recorded. The calibrated rolling line elevation of the rolling mill is corrected according to the wear data records recorded in the frame roller wear monitoring module to obtain the corrected rolling line elevation, and the corrected rolling line elevation is used as an elevation parameter to participate in the calculation of the stroke of the roller hydraulic device of the lower roller. The actual rolling line elevation obtained after the roller gap is adjusted is closer to the designed rolling line elevation. After each rolling pass, the wear data records stored in the frame roller wear monitoring module are also updated to ensure that the wear data recorded in the frame roller wear monitoring module conforms to the changes in the actual operating conditions. Each time the frame roller is updated, the corresponding wear data records in the frame roller wear monitoring module are automatically updated and reset through the equipment management system, so that no human intervention is required.

[0031] Compared with the prior art, the rolling line elevation correction method of the present invention has the following beneficial effects: the rolling line elevation correction method of the present invention effectively reduces the influence of frame roller wear on the rolling line elevation of the rolling mill, so that the actual rolling line elevation is always kept close to the designed rolling line elevation, avoiding the buckling phenomenon that occurs when the rolling mill rolls steel plates, ensuring that the rolled steel plates have a higher flatness, and improving product quality; and, since the entire method is automatically implemented throughout the entire process, no human intervention is required, thereby reducing manpower input and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a schematic diagram of a rolling mill rolling a steel plate, in which the rolling mill is rolling the steel plate normally;

[0033] Figure 2 This is a schematic diagram of a rolling mill rolling a steel plate, in which the steel plate rolled by the rolling mill has a buckle phenomenon;

[0034] Figure 3 The present invention is a flow chart of a method for correcting the elevation of a rolling mill line based on stand roller wear data.

[0035] In the figure: 1- rolling mill, 11- lower roller, 12- stand roller, 2- steel plate. DETAILED DESCRIPTION

[0036] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments:

[0037] The upstream side and downstream side mentioned in this article refer to the direction of the rolling mill production line, that is, the side of the rolling mill facing the front process is the upstream side, and the side of the rolling mill facing the rear process is the downstream side.

[0038] The rolling entry side mentioned in this article refers to the side of the rolling mill where the steel plate is located when the steel plate begins to enter the rolling mill for rolling, and the rolling exit side refers to the other side of the rolling mill opposite to the rolling entry side. For a unidirectional rolling mill, the rolling entry side is the upstream side of the rolling mill, and the rolling exit side is the downstream side of the rolling mill. For a reciprocating rolling mill, the positions of the rolling entry side and the rolling exit side are not fixed. When the rolling direction of the rolling mill is consistent with the direction of the production line, the rolling entry side is the upstream side of the rolling mill, and the rolling exit side is the downstream side of the rolling mill. When the rolling direction of the rolling mill is opposite to the direction of the production line, the rolling entry side is the downstream side of the rolling mill, and the rolling exit side is the upstream side of the rolling mill.

[0039] The rolling section roller mentioned in this article refers to the frame roller that the steel plate touches during one pass of rolling in the rolling mill. The rolling section roller is usually determined based on the length of the steel plate before rolling and the length of the steel plate after rolling. Specifically, the frame roller at the rolling entrance side that is equal to the length of the steel plate before rolling and the frame roller at the rolling exit side that is equal to the length of the steel plate after rolling are collectively determined as the rolling section roller. The significance of the rolling section roller is that the frame rollers in the rolling section roller will be worn because they are touched by the steel plate, while the frame rollers outside the rolling section roller will not be worn because they are not touched by the steel plate.

[0040] See also Figure 3 This embodiment provides a rolling mill line elevation correction method based on stand roller wear data, and the rolling mill line elevation correction method is implemented in a finishing mill of a thick plate production line of a steel company. The rolling mill implemented in this embodiment is a reciprocating rolling mill, which refers to a rolling mill with reversible rolling direction, that is, the steel plate can enter the rolling mill for rolling from the upstream side of the rolling mill, and can also enter the rolling mill for rolling from the downstream side of the rolling mill.

[0041] The rolling line elevation correction method of this embodiment includes steps 1 to 4.

[0042] Step 1, setting a frame roller wear monitoring module, the frame roller wear monitoring module is data-connected with the equipment management system, and the frame roller wear monitoring module is data-connected with the rolling mill control system; the frame roller wear monitoring module stores the wear data records of the rolling mill frame rollers.

[0043] The rack roller wear monitoring module is essentially a database software system, and the rack roller wear data record is a data record in the database software system. The database software system records the wear data records of all rack rollers in the rolling mill, and each wear data record includes data items such as the rack roller number, the initial radius of the upper line, and the wear value. The rack roller number in the wear data record can be used as a keyword to find the wear data record of the corresponding rack roller in the database; the initial radius of the upper line in the wear data record records the roller body radius of the newly replaced rack roller after the rack roller is replaced during equipment maintenance; the wear value in the wear data record records the accumulated wear of the rack roller.

[0044] The rack roller wear monitoring module runs in a server at the production site, and the server is connected to a production computer network. The rack roller wear monitoring module can exchange data with the equipment management system and the rolling mill control system through the computer network.

[0045] Step 2, when performing equipment maintenance, when the equipment maintenance personnel updates the frame roller according to the maintenance plan, the equipment maintenance personnel inputs the updated new frame roller data information into the equipment management system according to the regulations, and the equipment management system automatically sends the new frame roller data information to the frame roller wear monitoring module, and the frame roller wear monitoring module updates and resets the stored wear data records according to the received new frame roller data information.

[0046] The data information of the new frame roller includes the frame roller number and roller diameter of the new frame roller. When the frame roller wear monitoring module updates and resets the stored wear data record, the frame roller number is used as a keyword to retrieve the wear data record of the corresponding frame roller in the frame roller wear monitoring module, and then the upper line initial radius in the wear data record is updated according to the roller diameter of the new frame roller, and the wear value in the wear data record is reset to 0.

[0047] Step 3: After the rolling mill completes each rolling pass, the frame roller wear monitoring module calculates the wear data of the frame rollers in the rolling working section roller table, and then updates the wear data records stored in the frame roller wear monitoring module according to the wear data.

[0048] The step 3 specifically includes steps 3.1 to 3.3.

[0049] Step 3.1, after each rolling pass, the stand roller wear monitoring module obtains the rolling mill operation data from the rolling mill control system.

[0050] The rolling mill operation data includes data such as rolling direction, steel plate length before rolling, steel plate length after rolling, etc. Since the rolling mill in this embodiment is a reciprocating rolling mill, the rolling mill operation data includes the rolling direction, and according to other embodiments of the present invention, if the rolling mill is a unidirectional rolling mill, the rolling direction data can be omitted in the rolling mill operation data.

[0051] Step 3.2, determining the rolling section roller of the rolling mill according to the rolling mill operation data.

[0052] The specific process of determining the rolling working section roller table includes: firstly determining the rolling entrance side and the rolling exit side of the rolling mill according to the rolling direction, and then determining the frame roller table at the rolling entrance side that is equal to the length of the steel plate before rolling, and the frame roller table at the rolling exit side that is equal to the length of the steel plate after rolling as the rolling working section roller table. More specifically, if the rolling entrance side is the upstream side of the rolling mill, and the rolling exit side is the downstream side of the rolling mill, the frame roller table at the upstream side of the rolling mill that is equal to the length of the steel plate before rolling, and the frame roller table at the downstream side of the rolling mill that is equal to the length of the steel plate after rolling are jointly determined as the rolling working section roller table; if the rolling entrance side is the downstream side of the rolling mill, and the rolling exit side is the upstream side of the rolling mill, the frame roller table at the downstream side of the rolling mill that is equal to the length of the steel plate before rolling, and the frame roller table at the upstream side of the rolling mill that is equal to the length of the steel plate after rolling are jointly determined as the rolling working section roller table.

[0053] Since the rolling mill in this embodiment is a reciprocating rolling mill, it is necessary to first determine the rolling entrance side and the rolling exit side of the rolling mill before determining the rolling working section roller. According to other embodiments of the present invention, if the rolling mill is a unidirectional rolling mill, there is no need to determine the rolling entrance side and the rolling exit side of the rolling mill. The frame roller at the upstream side of the rolling mill with the same length as the steel plate before rolling and the frame roller at the downstream side of the rolling mill with the same length as the steel plate after rolling can be directly determined as the rolling working section roller.

[0054] Step 3.3, for each stand roller in the rolling section roller table, read the corresponding wear data record in the stand roller wear monitoring module, add the wear value in the wear data record to the single-pass wear value to obtain a new wear value, and update the wear value in the wear data record to the new wear value.

[0055] When reading the wear data record in the stand roller wear monitoring module, the stand roller number can be used as a key to retrieve the wear data record of the corresponding stand roller in the stand roller wear monitoring module.

[0056] The single-pass wear value is the wear amount of the stand roller after the rolling mill performs one pass of rolling. In this embodiment, the single-pass wear value adopts a wear constant value, which is an empirical value, usually estimated based on actual wear measurement during equipment maintenance, and the wear constant value is usually between -10 -3 ~ -10 -7 The value is within the range of , and the unit is millimeter.

[0057] Step 4: before each rolling pass, determine the corrected rolling line elevation according to the wear data recorded in the stand roller wear monitoring module and in combination with the calibrated rolling line elevation of the rolling mill.

[0058] The step 4 includes steps 4.1 to 4.4.

[0059] Step 4.1, for each stand roller at the rolling inlet side, read the corresponding wear data record in the stand roller wear monitoring module.

[0060] Since the rolling mill in the present embodiment is a reciprocating rolling mill, before reading the wear data record, the rolling entrance side must be determined according to the rolling direction of the rolling mill.

[0061] Step 4.2, for each stand roll at the rolling inlet side, add the upper line initial radius in the wear data record to the wear value to obtain the roller body radius after wear, and then subtract the roller body radius after wear from the standard roller body radius to obtain the wear offset value. In this embodiment, the wear value is in the form of a negative value.

[0062] Step 4.3, select the minimum value among all the wear offset values ​​obtained as the elevation correction offset value.

[0063] Step 4.4, the corrected rolling line elevation is obtained by subtracting the elevation correction offset value from the calibrated rolling line elevation of the rolling mill.

[0064] The calculation process in step 4 is specifically implemented by the hydraulic stroke calculation module of the rolling mill control system.

[0065] The hydraulic stroke calculation module in the rolling mill control system uses the corrected rolling line elevation obtained in step 4 as the elevation parameter to calculate the stroke of the roller hydraulic device of the lower roller, and controls the roller hydraulic device to drive the lower roller to move according to the calculation result of the hydraulic stroke calculation module. The adjusted actual rolling line elevation is close to the designed rolling line elevation.

[0066] The roll line elevation correction method of this embodiment effectively reduces the influence of the frame roller wear on the actual roll line elevation, thereby making the actual roll line elevation always close to the designed roll line elevation, avoiding the buckling phenomenon when the rolling mill rolls the steel plate, and ensuring that the rolled steel plate has a high flatness. In addition, since the entire method is automatically implemented throughout the entire process, no human intervention is required, thereby reducing manpower and improving production efficiency.

[0067] It should be noted that the rolling line elevation correction method of this embodiment is only applicable to a rolling mill in which the roll hydraulic device is installed at the lower roll.

[0068] An embodiment is provided below.

[0069] In this embodiment, the three frame rollers on the upstream side of the rolling mill are taken as an example. The standard roller body diameter of the frame roller is 500 mm, and the standard roller body radius is 250 mm. The three frame rollers are numbered as roller No. 1, roller No. 2 and roller No. 3, and the distances between roller No. 1, roller No. 2 and roller No. 3 and the rolling mill are 1 meter, 2 meters and 3 meters, respectively.

[0070] The present embodiment is as follows:

[0071] 1) A frame roller wear monitoring module is provided, wherein data is communicated between the frame roller wear monitoring module and the equipment management system, and data is communicated between the frame roller wear monitoring module and the rolling mill control system; the frame roller wear monitoring module stores wear data records of the rolling mill frame roller.

[0072] 2) The equipment maintenance personnel input the roller diameter and number of the new rack roller into the equipment management system. The equipment management system automatically sends the information to the rack roller wear monitoring module. The rack roller wear monitoring module updates and resets the stored wear data records according to the received new rack roller information, including updating the upper line initial radius in the wear data record according to the roller diameter of the new rack roller, and resetting the wear value in the wear data record to 0.

[0073] 3) One year after the roller is replaced, after the Mth rolling pass is completed, the wear data records stored in the stand roller wear monitoring module are updated, including:

[0074] 3.1) After the Mth rolling pass is completed, the stand roller wear monitoring module obtains the rolling mill operation data such as rolling direction (opposite to the production line direction), steel plate length before rolling (15 meters), and steel plate length after rolling (18 meters) from the rolling mill control system.

[0075] 3.2) The rolling direction is opposite to the production line direction, the downstream side of the rolling mill is the rolling entrance side, the upstream side of the rolling mill is the rolling exit side, the length of the steel plate before rolling is 15 meters, and the length of the steel plate after rolling is 18 meters. It can be determined that the rolling working section roller is the frame roller from 15 meters downstream of the rolling mill to 18 meters upstream of the rolling mill.

[0076] 3.3) The three frame rollers described in this embodiment are on the upstream side of the rolling mill, and the distances from the rolling mill are 1 meter, 2 meters and 3 meters respectively. Therefore, they are frame rollers in the roller table of the rolling working section. It is necessary to update the corresponding wear data records of the three frame rollers in the frame roller wear monitoring module. Read the corresponding wear data records in the frame roller wear monitoring module. The wear values ​​in the wear data records of rollers No. 1, No. 2 and No. 3 are -1.0mm, -2.0mm and -3.0mm respectively. Then add these three wear values ​​to the single-pass wear value to obtain a new wear value. In this embodiment, the single-pass wear value is -10 -5 mm, the new wear values ​​obtained after addition are -1.00001mm, -2.00001mm, and -3.00001mm respectively. These three values ​​are then used to update the original wear values ​​in the rack roller wear monitoring module.

[0077] 4) Before the M+1th rolling (rolling direction is consistent with the production line direction), determine the corrected rolling line elevation, including:

[0078] 4.1) Since the rolling direction is consistent with the production line direction, the upstream side of the rolling mill is the rolling entrance side. The three stand rollers are located on the upstream side of the rolling mill, so the three stand rollers belong to the stand rollers on the rolling entrance side. Then, the corresponding wear data records of the three stand rollers are read in the stand roller wear monitoring module.

[0079] 4.2) Add the initial radius of the upper line in the wear data record of the three stand rollers to the wear value to obtain the roller body radius after wear. The initial radius of the upper line of rollers 1, 2, and 3 is 250mm, and the wear values ​​are -1.00001mm, -2.00001mm, and -3.00001mm, respectively. The roller body radius after wear is 248.99999mm, 247.99999mm, and 246.99999mm, respectively. Then, the wear offset value is obtained by subtracting the roller body radius after wear from the standard roller body radius. The standard roller body radius of the stand roller is 250, and the wear offset values ​​obtained are -1.00001mm, -2.00001mm, and -3.00001mm, respectively.

[0080] 4.3) Select the minimum value among all the wear offset values ​​obtained as the elevation correction offset value. It can be determined that the minimum value among all the wear offset values ​​is -1.00001mm.

[0081] 4.4) Subtract the elevation correction offset value from the calibrated rolling line elevation of the rolling mill to obtain the corrected rolling line elevation. The calibrated rolling line elevation of the rolling mill is 45mm, so the corrected rolling line elevation is 45 - 1.00001 = 43.99999mm.

[0082] The rolling line elevation correction method of the present embodiment is implemented in a thick plate finishing mill, while in other embodiments, the rolling line elevation correction method according to the present invention can also be used for other types of rolling mills.

[0083] The above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for correcting the elevation of a rolling mill line based on stand roller wear data, characterized in that: The steps include: Step 1, setting a frame roller wear monitoring module, wherein the frame roller wear monitoring module is data-connected with the equipment management system, and the frame roller wear monitoring module is data-connected with the rolling mill control system; the frame roller wear monitoring module stores wear data records of the rolling mill frame roller; Step 2: When the rack roller is updated, the updated data information of the new rack roller is input into the equipment management system, and the equipment management system sends the new data information of the rack roller to the rack roller wear monitoring module, and the rack roller wear monitoring module updates and resets the stored wear data record according to the received new data information of the rack roller; Step 3, after each rolling pass, the frame roller wear monitoring module calculates the wear data of the frame roller in the roller table of the rolling working section, and then updates the wear data record stored in the frame roller wear monitoring module according to the wear data; The step 3 comprises the following sub-steps: Step 3.1, after each rolling pass, the stand roller wear monitoring module obtains the rolling mill operation data from the rolling mill control system; Step 3.2, determining the rolling section roller of the rolling mill according to the rolling mill operation data; Step 3.3, for each stand roller in the rolling section roller table, read the corresponding wear data record in the stand roller wear monitoring module, add the wear value in the wear data record to the single-pass wear value to obtain a new wear value, and update the wear value in the wear data record to the new wear value; Step 4, before each rolling pass, determine the corrected rolling line elevation according to the wear data recorded in the stand roller wear monitoring module and in combination with the calibrated rolling line elevation of the rolling mill; The step 4 comprises the following sub-steps: Step 4.1, for each stand roller at the rolling inlet side, reading the corresponding wear data record in the stand roller wear monitoring module; Step 4.2, for each stand roller on the rolling inlet side, add the upper line initial radius in the wear data record to the wear value to obtain the roller body radius after wear, and then subtract the roller body radius after wear from the standard roller body radius to obtain the wear offset value; Step 4.3, selecting the minimum value among all the wear offset values ​​obtained as the elevation correction offset value; Step 4.4, the corrected rolling line elevation is obtained by subtracting the elevation correction offset value from the calibrated rolling line elevation of the rolling mill.

2. The method for correcting the rolling line elevation of a rolling mill based on the stand roller wear data according to claim 1, characterized in that: The wear data record of the rolling mill stand roller stored in the stand roller wear monitoring module includes the stand roller number, the initial radius of the upper line and the wear value.

3. The method for correcting the rolling line elevation of a rolling mill based on the stand roller wear data according to claim 2, characterized in that: In step 2, the data information of the new frame roller includes the frame roller number and roller diameter of the new frame roller; when the frame roller wear monitoring module updates and resets the stored wear data record, the frame roller number is first used as a keyword to retrieve the wear data record of the corresponding frame roller in the frame roller wear monitoring module, and then the upper line initial radius in the wear data record is updated according to the roller diameter of the new frame roller, and the wear value in the wear data record is reset to 0.

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