Online grinding roller control method for realizing free rolling

Abstract

The invention relates to an on-line grinding roller control method for realizing free rolling, which comprises the following steps of: 1, storing a strip steel channeling roller setting storage module, 2, calculating a channeling roller initial setting calculation module of an on-line grinding roller, 3, setting a sending trigger time judgment module for judging, and 4, setting a sending trigger time judgment module for sending the sending trigger time. And 4, the online grinding roller control module carries out control. According to the scheme, the abrasion of the roller can be smoothed and homogenized, and the rolling kilometers of free rolling can be prolonged.

Description

Technical Field

[0001] The invention relates to a control method, in particular to an online grinding roller control method for realizing free rolling, and belongs to the technical field of hot continuous rolling production. Background Art

[0002] To further reduce hot-rolling production costs, direct loading and rolling, separate charging of hot and cold slabs, and separate charging of slabs with different heating processes are all very effective energy-saving methods. However, due to the random and frequent switching of different steel grades and specifications during the rolling process, problems such as cross-rolling of different steel grades and specifications and restrictions on batch widths may arise. Therefore, hot-rolling production lines must develop free rolling technologies that are adapted to their own characteristics.

[0003] Free rolling is an ideal state in hot strip rolling. In actual production, a relatively free rolling method is pursued to improve mixed cross-rolling capabilities. Mixed cross-rolling refers to the cross-charging and cross-rolling of slabs of different widths, thicknesses, and steel grades. Due to the cross-variation in incoming material width, controlling the finished strip shape and cross-section during mixed cross-rolling is difficult. Roller wear caused by rolling narrow strips can easily lead to defects such as edge warping and double-sided waves across the width of the strip. Currently, in hot strip rolling operations, steel mills both domestically and internationally generally employ online roller grinding systems to smooth and even out roller wear and extend rolling mileage. However, an online roller grinding system requires an initial investment of over one million yuan, and later requires dedicated maintenance personnel and the investment in equipment spare parts. This is a long-term, ongoing investment that increases production costs.

[0004] New Search and Comparison

[0005] After novelty check, patent: CN102615560A, name: Online roller grinding method capable of realizing reverse width rolling. This invention discloses an online roller grinding method capable of realizing reverse width rolling. The effective working area range of the roller is determined according to the maximum plate width of the strip in the actual rolling plan and the roller shifting amount of the working roller. The online roller grinding machine is controlled to grind only the effective area in the center of the roller within a limited rolling time, while the invalid area that does not contact the strip does not participate in the grinding, thereby maximizing the grinding of the plate-passing area of ​​the roller, thereby generating a flat roller shape in the plate-passing area of ​​the roller, and ultimately realizing reverse width rolling. This solution is to control the online roller grinding machine to grind only the effective area in the center of the roller within a limited rolling time, thereby maximizing the grinding of the plate-passing area of ​​the roller, thereby generating a flat roller shape in the plate-passing area of ​​the roller, and ultimately realizing reverse width rolling. It is a method for effective grinding on the equipment of an online roller grinding machine.

[0006] Patent: CN201420087889.7, Title: A Roller with an Online Grinding Device. This utility model patent discloses a roll with an online grinding device, which enables online grinding without removing the roll from the rolling mill. This solution discloses a roll with an online grinding device, which enables online grinding without removing the roll from the rolling mill. Summary of the Invention

[0007] The present invention is aimed at the problems existing in the prior art and provides an online grinding roller control method for realizing free rolling. This technical solution realizes an online grinding roller control method through autonomous programming without adding any hardware equipment. Autonomous programming is a one-time labor cost investment, and there is no hardware cost investment. There is no subsequent equipment replacement and maintenance cost. The new invention method realizes an online grinding roller control method by adding four functional modules (strip roller shifting setting storage module, adding an online grinding roller shifting initial setting calculation module, adding a setting sending trigger timing judgment module, and adding an online grinding roller control module). The method is clear in concept but reasonable and highly operational. This solution not only effectively extends the rolling mileage of free rolling, but also extends the mileage of normal rolling.

[0008] In order to achieve the above object, the technical solution of the present invention is as follows: an online grinding roller control method for realizing free rolling, the method comprising the following steps:

[0009] Step 1: The strip roll is set in the storage module for storage.

[0010] Step 2: The online grinding roller initial setting calculation module calculates the roller shifting.

[0011] Step 3: Set the trigger timing judgment module to make a judgment.

[0012] Step 4: Online grinding roller control module performs control.

[0013] As an improvement of the present invention, step 1: the strip roll shifting setting storage module is stored, specifically as follows: the roll shifting setting positions of the finishing rolling F0-F6 stands are recorded and stored in the one-dimensional variable samp.pr_shift[n] with seven stands respectively, where n represents the seven finishing rolling stands and n is a value between 0..6.

[0014] As an improvement of the present invention, step 2: the calculation module for the initial setting of the roller shifting of the online grinding roller performs calculations, specifically as follows: the calculation rules of the calculation module for the initial setting of the roller shifting follow:

[0015] 1. When samp.pr_shift[n]>0, then cur_shift[n]=shift_limit_min,

[0016] 2. When samp.pr_shift[n]<=0, then cur_shift[n]=shift_limit_max,

[0017] Among them, n represents the seven finishing stands, n is a value between 0 and 6, and shift_limit_min and shift_limit_max are the minimum and maximum stroke limits of the finishing stand roller shifting.

[0018] As an improvement of the present invention, step 3: set the trigger timing judgment module to make a judgment, specifically as follows: when the production rhythm is slow (Gaptime>60s), the application detects whether there is steel in the area from the exit of the last rough rolling stand to the entrance of the finishing rolling. If there is no steel, the application sends an online grinding roller setting request to the model, and the application sends the roller shifting setting calculated by the requested model to L1. When the hot rolling production line is stopped waiting for material, the operator can manually trigger the request for roller shifting setting, where L1 is a first-level basic automation control system.

[0019] As an improvement of the present invention, step 4: online grinding roller control module performs control as follows:

[0020] L1 receives the roller shifting setting data calculated by the model and starts the online grinding roller control process:

[0021] (1) First, start the roller shifting of the finishing rolling F0-F6 stand at high acceleration.

[0022] (2) At the same time, ensure that the bending roller of the F0-F6 frame has a 90T balance force, and then the shifting roller of the F0-F6 frame reaches the set position,

[0023] (3) After giving a static pressure of 300T, release the static pressure.

[0024] (4) The roller of the F0-F6 frame moves from the set position to the position of "set position * (-1)",

[0025] (5) After applying a static pressure of 300T, release the static pressure.

[0026] (6) If there is no steel in the area between the exit of the last stand of rough rolling and the entrance of finishing rolling, and the operator has not started to change the rolls, the roll shifting of the F0-F6 stands will continue to move to the set position, and then move to the position of "set position * (-1)".

[0027] (7) After giving a static pressure of 300T, release the static pressure.

[0028] Each time the roll shifting position of the F0-F6 stands reaches the set position, a static pressure of 300 tons is applied and then released. This process repeats until steel is present between the exit of the last roughing stand and the entrance of the finishing mill, or the operator triggers a roll change signal. Through these steps, an online grinding roll control method for free rolling is implemented. This solution helps to smooth and evenly distribute roll wear, extending the rolling mileage of free rolling.

[0029] Compared with the prior art, the present invention has the following advantages: the technical solution is simple in structure and easy to use. The method is mainly reflected in:

[0030] 1) Without adding any hardware equipment, an online grinding roller control method is realized through independent programming.

[0031] 2) Self-programming is a one-time labor cost investment, with zero hardware cost investment and no subsequent equipment replacement and maintenance costs.

[0032] 3) This method realizes an online grinding roller control method by adding four functional modules (strip roller shifting setting storage module, adding an online grinding roller shifting initial setting calculation module, adding a setting sending trigger timing judgment module, and adding an online grinding roller control module). This method has a clear but reasonable idea and strong operability.

[0033] 4) It not only effectively extends the mileage of free rolling, but also extends the mileage of normal rolling. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the online grinding roller control process of the present invention. DETAILED DESCRIPTION

[0035] In order to deepen the understanding of the present invention, this embodiment is described in detail below with reference to the accompanying drawings.

[0036] Example 1: See Figure 1 , an online grinding roller control method for achieving free rolling, the method comprising the following steps:

[0037] Step 1: The strip roll is set in the storage module for storage.

[0038] Step 2: The online grinding roller initial setting calculation module calculates the roller shifting.

[0039] Step 3: Set the trigger timing judgment module to make a judgment.

[0040] Step 4: Online grinding roller control module performs control.

[0041] Among them, step 1: the strip roll shifting setting storage module is stored, specifically as follows: the roll shifting setting positions of the finishing rolling F0-F6 stands are recorded and stored in the one-dimensional variable samp.pr_shift[n] with seven stands respectively, where n represents the seven finishing rolling stands and n is a value between 0..6.

[0042] Among them, step 2: the calculation module of the initial setting of the roller shifting of the online grinding roller is calculated as follows: the calculation rules of the calculation module of the initial setting of the roller shifting follow:

[0043] 1. When samp.pr_shift[n]>0, then cur_shift[n]=shift_limit_min,

[0044] 2. When samp.pr_shift[n]<=0, then cur_shift[n]=shift_limit_max,

[0045] Among them, n represents the seven finishing stands, n is a value between 0 and 6, and shift_limit_min and shift_limit_max are the minimum and maximum stroke limits of the finishing stand roller shifting.

[0046] Among them, step 3: set the sending trigger timing judgment module to make a judgment, specifically as follows: when the production rhythm is slow (Gaptime>60s), the application detects whether there is steel in the area from the exit of the last stand of rough rolling to the entrance of finishing rolling. If there is no steel, the application sends an online grinding roller setting request to the model, and the application sends the roller shifting setting calculated by the requested model to L1. When the hot rolling production line is stopped waiting for material, the operator can manually trigger the request for roller shifting setting, where L1 is a first-level basic automation control system.

[0047] Among them, step 4: online grinding roller control module performs control, as follows:

[0048] L1 receives the roller shifting setting data calculated by the model and starts the online grinding roller control process:

[0049] (1) First, start the roller shifting of the finishing rolling F0-F6 stand at high acceleration.

[0050] (2) At the same time, ensure that the bending roller of the F0-F6 frame has a 90T balance force, and then the shifting roller of the F0-F6 frame reaches the set position,

[0051] (3) After giving a static pressure of 300T, release the static pressure.

[0052] (4) The roller of the F0-F6 frame moves from the set position to the position of "set position * (-1)",

[0053] (5) After applying a static pressure of 300T, release the static pressure.

[0054] (6) If there is no steel in the area between the exit of the last stand of rough rolling and the entrance of finishing rolling, and the operator has not started to change the rolls, the roll shifting of the F0-F6 stands will continue to move to the set position, and then move to the position of "set position * (-1)".

[0055] (7) After giving a static pressure of 300T, release the static pressure.

[0056] Each time the roll shifting position of the F0-F6 stand reaches the set position, it is necessary to give a static pressure of 300T and then release the static pressure, and repeat this process until there is steel at the exit of the last stand of the rough rolling mill to the entrance of the finishing mill, or the operator triggers the start roll change signal.

[0057] Through the above steps, an online grinding roller control method for free rolling is realized. This solution helps to smooth and even the wear of the rollers and extend the rolling mileage of free rolling.

[0058] Example 2: Taking the free rolling production of Meishan Iron and Steel's 1422 hot rolling production line on June 5, 2023 as an example, an online grinding roller control method for achieving free rolling is applied.

[0059] Step 1: The strip roll shifting setting storage module records the roll shifting setting positions of the finishing rolling F0-F6 stands, and stores them in the one-dimensional variable samp.pr_shift[0..6]=[0,-23.75,-25.43,-17.08,-49.99,20.02,-3.60] with seven stands respectively.

[0060] Step 2: The calculation module for the initial setting of the roller shifting of the online grinding roller, the calculation module for the initial setting of the roller shifting of the F0-F6 frame calculates samp.pr_shift[0..6]=[0,-23.75,-25.43,-17.08,-49.99,20.02,-3.60] and the output result is

[0061] [False,False,False,False,False,True,False], according to the following rules:

[0062] 1. When samp.pr_shift[n]>0, then cur_shift[n]=shift_limit_min;

[0063] 2. When samp.pr_shift[n]<=0, cur_shift[n]=shift_limit_max.

[0064] In Meishan Iron and Steel's 1422 hot rolling production line, the shift_limit_min and shift_limit_max of the F0 stand are both 0, while the shift_limit_min of the other F1-F6 stands is -95 and the shift_limit_max is 95. Therefore, the calculated initial setting position of the online grinding rollers of the finishing rolling F0-F6 stands is [0,95,95,95,95,-95,95].

[0065] Step 3: Set up the trigger timing judgment module. If the application detects that there is no steel in the area between the exit of the last roughing mill stand and the entrance of the finishing mill, it sends an online roller setting request to the model. The application sends the requested model-calculated roller shifting settings for stands F0-F6 (0, 95, 95, 95, -95, 95) to L1.

[0066] Step 4: Online grinding roller control module,

[0067] L1 receives the roller shifting setting data of [0,95,95,95,95,-95,95]. Start online grinding roller control:

[0068] (1) First, start the roller shifting of the finishing rolling F0-F6 stand at high acceleration, and at the same time ensure that the bending roller of the F0-F6 stand has a 90T balance force.

[0069] (2) The shifting rollers of the F0-F6 frames reach the set position of [0,95,95,95,95,-95,95].

[0070] (3) After applying a static pressure of 300T, release the static pressure.

[0071] (4) The roller of the F0-F6 frame moves from the set position to the position of "set position * (-1)".

[0072] [0,-95,-95,-95,-95,95,-95].

[0073] (5) After applying a static pressure of 300T, release the static pressure.

[0074] (6) If there is no steel in the area between the exit of the last roughing mill stand and the entrance of the finishing mill stand, and the operator has not started to change the rolls, the roll shifting of the F0-F6 mill stand will continue to move to the set position, and then move to the position of "set position * (-1)".

[0075] [0,95,95,95,95,-95,95].

[0076] (7) After applying a static pressure of 300T, release the static pressure.

[0077] Each time the roll shifting position of the F0-F6 stand reaches the set position, a static pressure of 300T is applied and then released, and this process is repeated until there is steel in the area from the exit of the last stand of the rough rolling mill to the entrance of the finishing mill, or the operator triggers the roll change start signal.

[0078] Through the above steps, an online grinding roller control method for free rolling is realized. The new invention method helps to uniformly wear the rollers and extend the rolling mileage of free rolling.

[0079] It should be noted that the above embodiments are not intended to limit the scope of protection of the present invention, and equivalent changes or substitutions made on the basis of the above technical solutions fall within the scope of protection of the claims of the present invention.

Claims

1. An online grinding roller control method for realizing free rolling, characterized in that: The method comprises the following steps: Step 1: The strip roll setting storage module is used for storage. Step 2: The online grinding roller initial setting calculation module calculates the roller shifting. Step 3: Set the sending trigger timing judgment module to make a judgment. Step 4: Online grinding roller control module for control.

2. The online grinding roller control method for realizing free rolling according to claim 1, characterized in that: Step 1: The strip roll shifting setting storage module is stored, as follows: the roll shifting setting positions of the finishing rolling F0-F6 stands are recorded and stored in the one-dimensional variable samp.pr_shift[n] with seven stands, where n represents the seven finishing rolling stands and n is a value between 0..

6.

3. The online grinding roller control method for realizing free rolling according to claim 2, characterized in that: Step 2: The calculation module for the initial setting of the roller shifting of the online grinding roller is used for calculation, as follows: The calculation rules of the calculation module for the initial setting of the roller shifting follow:

1. When samp.pr_shift[n]>0, then cur_shift[n]=shift_limit_min, 2. When samp.pr_shift[n]<=0, cur_shift[n]=shift_limit_max, Among them, n represents the seven finishing stands, n is a value between 0 and 6, and shift_limit_min and shift_limit_max are the minimum and maximum travel limits of the roller shifting of the finishing stand.

4. The online grinding roller control method for realizing free rolling according to claim 3, characterized in that: Step 3: Set the trigger timing judgment module to make a judgment, as follows: When the production rhythm is slow (Gaptime>60s), the application detects whether there is steel in the area from the exit of the last stand of rough rolling to the entrance of finishing rolling. If there is no steel, the application sends an online grinding roller setting request to the model, and the application sends the roller shifting setting calculated by the requested model to L1. When the hot rolling production line is stopped waiting for material, the operator can manually trigger the request for roller shifting setting, where L1 is a first-level basic automation control system.

5. The online grinding roller control method for realizing free rolling according to claim 3 or 4, characterized in that: Step 4: The online grinding roller control module performs control as follows: L1 receives the roller shifting setting data calculated by the model and starts the online roller control process: (1) First, start the roller shifting of the finishing rolling F0-F6 stands at high acceleration. (2) At the same time, ensure that the bending roller of the F0-F6 frame has a 90T balance force, and then the shifting roller of the F0-F6 frame reaches the set position, (3) After giving a static pressure of 300T, release the static pressure. (4) The roller of the F0-F6 frame moves from the set position to the position of "set position * (-1)", (5) After giving a static pressure of 300T, release the static pressure. (6) If there is no steel in the area between the exit of the last stand of rough rolling and the entrance of finishing rolling, and the operator has not started to change the rolls, the roll shifting of the F0-F6 stands will continue to move to the set position, and then move to the position of "set position * (-1)". (7) After the static pressure of 300T is given, the static pressure is released. Each time the roll shifting position of the F0-F6 stand reaches the set position, a static pressure of 300T is applied and then released, and this process is repeated until there is steel at the exit of the last stand of the rough rolling mill and the entrance of the finishing mill, or the operator triggers the roll change signal. Through the above steps, an online grinding roller control method for realizing free rolling is realized.

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