A control method for finishing rolling equipment

Abstract

This application provides a control method for a finishing mill, comprising work rolls and a flying shear pyrometer. The method includes: after switching the flying shear pyrometer to an active state, acquiring the roll shifting parameters of the work rolls; determining a target roll shifting position value based on the roll shifting parameters; and controlling the roll shifting operation of the work rolls based on the target roll shifting position value. The technical solution provided by this application, by determining the target roll shifting position value based on the roll shifting parameters and then controlling the roll shifting operation of the work rolls based on the target roll shifting position value, can ensure relatively uniform wear of the finishing mill work rolls in continuous production, thereby reducing the probability of composite waves, ensuring strip quality, and improving the stability of hot-rolled strip rolling.

Description

Technical Field

[0001] This application relates to the field of continuous rolling technology, and more specifically, to a control method for a finishing rolling mill. Background Technology

[0002] Currently, when addressing common waviness issues, adjustments to the bending force of the finishing rolls or the roll gap level are typically made to reduce or eliminate waviness in hot-rolled strip. However, when complex waviness occurs, adjusting the bending force of the finishing rolls and the roll gap level does not produce significant results.

[0003] Therefore, those skilled in the art urgently need a control method for finishing rolling equipment that can reduce the probability of compound waves, ensure plate quality, and improve rolling stability. Summary of the Invention

[0004] The embodiments of this application provide a control method for a finishing rolling mill, which can at least to some extent reduce the probability of compound waves, ensure plate quality, and improve rolling stability.

[0005] Other features and advantages of this application will become apparent from the following detailed description, or may be learned in part from practice of this application.

[0006] According to one aspect of the embodiments of this application, a control method for a finishing mill is provided. The finishing mill includes a work roll and a flying shear pyrometer. The method includes: after switching the flying shear pyrometer to an active state, acquiring the roll shifting operating parameters of the work roll; determining a target roll shifting position value based on the roll shifting operating parameters; and controlling the roll shifting operation of the work roll based on the target roll shifting position value.

[0007] In some embodiments of this application, before switching the flying shear pyrometer to the active state, the method includes: initializing the working parameters of the work roll.

[0008] In some embodiments of this application, based on the aforementioned scheme, the working parameters of the skewed roller include: maximum skewed roller stroke, inner skewed stroke, inner skewed step length, outer skewed step length, counter count, actual skewed roller position value, attenuation quantity, attenuated stroke, attenuated step length, direction of skewed roller movement, attenuation stroke change, and current maximum stroke.

[0009] In some embodiments of this application, based on the foregoing scheme, determining the target roller position value according to the roller shifting parameters includes: if the direction of the working roller shifting is towards the drive side, and the counter count is greater than the attenuation amount, the target roller position value is the sum of the actual roller shifting position value and the attenuated step size; if the current target roller shifting position value is greater than the attenuated travel, the target roller shifting position value is corrected to twice the difference between the attenuated travel and the current target roller shifting position value, and the direction of the working roller shifting is corrected to the working side.

[0010] In some embodiments of this application, based on the foregoing scheme, determining the target roller position value according to the roller shifting parameters includes: if the direction of the work roller shifting is towards the working side, and the counter count is greater than the attenuation amount, the target roller position value is the difference between the actual roller shifting position value and the attenuated step size; if the current target roller shifting position value is less than the negative number of the attenuated stroke, then the target roller shifting position value is corrected to twice the difference between the attenuated stroke and the current target roller shifting position value, and the direction of the work roller shifting is corrected to the transmission side.

[0011] In some embodiments of this application, based on the foregoing scheme, determining the target roller position value according to the roller shifting working parameters includes: if the direction of the working roller shifting is towards the transmission side, and the counter count is less than or equal to the attenuation quantity, and the absolute value of the actual roller shifting position value is less than or equal to the current maximum stroke, and the absolute value of the actual roller shifting position value is less than or equal to the inner shifting stroke, then the target roller shifting position value is the sum of the actual roller shifting position value and the inner shifting step size.

[0012] In some embodiments of this application, based on the foregoing scheme, determining the target roller position value according to the roller movement parameters includes: if the direction of the working roller movement is towards the drive side, and the counter count is less than or equal to the attenuation amount, and the absolute value of the actual roller position value is less than or equal to the current maximum stroke, and the absolute value of the actual roller position value is greater than the inner movement stroke, then the target roller position value is the sum of the actual roller position value and the outer movement step; if the current target roller position value is greater than the current maximum stroke, then the target roller position value is corrected to twice the difference between the current maximum stroke and the current target roller position value, and the direction of the working roller movement is corrected to the working side.

[0013] In some embodiments of this application, based on the foregoing scheme, determining the target roller position value according to the roller shifting working parameters includes: if the direction of the working roller shifting is towards the working side, and the counter count is less than or equal to the attenuation number, and the absolute value of the actual roller shifting position value is less than or equal to the current maximum stroke, and the absolute value of the actual roller shifting position value is less than or equal to the inner shifting stroke, then the target roller shifting position value is the difference between the actual roller shifting position value and the inner shifting step.

[0014] In some embodiments of this application, based on the foregoing scheme, determining the target roller position value according to the roller movement parameters includes: if the direction of the work roller movement is towards the working side, and the counter count is less than or equal to the attenuation amount, and the absolute value of the actual roller position value is less than or equal to the current maximum stroke, and the absolute value of the actual roller position value is greater than the inner movement stroke, then the target roller position value is the difference between the actual roller position value and the outer movement step; if the current target roller position value is less than the opposite of the current maximum stroke, then the target roller position value is corrected to twice the difference between the current maximum stroke and the current target roller position value, and the direction of the work roller movement is corrected to the transmission side.

[0015] In some embodiments of this application, based on the foregoing scheme, after determining the target roller position value according to the roller operating parameters, the method further includes: switching the flying shear pyrometer to an inactive state, and incrementing the counter count by one.

[0016] In some embodiments of this application, the target roll position value is determined based on the roll shifting parameters, and then the roll shifting operation of the work roll is controlled based on the target roll shifting position value. In continuous production, ensuring relatively uniform wear of the finishing work roll reduces the probability of composite waves, guarantees strip quality, and improves the stability of hot-rolled strip rolling.

[0017] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. In the drawings:

[0019] Figure 1A flowchart of a control method for a finishing mill according to an embodiment of this application is shown;

[0020] Figure 2 A complete flowchart of a control method for a finishing mill according to an embodiment of this application is shown;

[0021] Figure 3 A flowchart of a control method for a finishing mill according to an embodiment of this application is shown;

[0022] Figure 4 A flowchart of a control method for a finishing mill according to an embodiment of this application is shown. Detailed Implementation

[0023] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided to make this application more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art.

[0024] The flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all content and operations / steps, nor do they necessarily have to be performed in the described order. For example, some operations / steps can be broken down, while others can be combined or partially combined; therefore, the actual execution order may change depending on the specific circumstances.

[0025] It should be noted that "multiple" in this article refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0026] Please see Figure 1 .

[0027] Figure 1 A flowchart illustrating a control method for a finishing mill according to an embodiment of this application is shown. The finishing mill includes work rolls and a flying shear pyrometer, such as... Figure 1 As shown, the method may include steps S101-S103:

[0028] Step S101: After switching the flying shear pyrometer to the active state, obtain the working parameters of the working roll.

[0029] Step S102: Determine the target roller position value based on the roller shifting working parameters.

[0030] Step S103: Based on the target roll position value, control the roll shifting operation of the work roll.

[0031] In this application, the target roll shifting position value can be determined based on the roll shifting operating parameters, and then the roll shifting operation of the work roll can be controlled based on the target roll shifting position value. In continuous production, ensuring relatively uniform wear of the finishing work roll can reduce the probability of compound waves, ensure strip quality, and improve the stability of hot-rolled strip rolling.

[0032] In this application, before switching the flying shear pyrometer to the active state, the method may include: initializing the working parameters of the working roll.

[0033] For example, the operating parameters of the skew roller can be initialized as shown in Table 1.

[0034]

[0035]

[0036] Table 1

[0037] In this application, the working parameters of the skewed roller may include: maximum skewed roller stroke, inner skewed stroke, inner skewed step length, outer skewed step length, counter count, actual skewed roller position value, attenuation quantity, attenuated stroke, attenuated step length, direction of skewed roller movement, attenuation stroke change, and current maximum stroke.

[0038] In this application, the current actual roll position value can be read, the roll movement direction is the direction in which the finishing work roll will move, and the movement towards the drive side can be defined as 1, and the movement towards the working side can be defined as -1. At the same time, the amount of attenuation stroke change can be calculated as (maximum roll movement - attenuated movement) / attenuation quantity, and the current maximum stroke can be calculated as (maximum roll movement - attenuation stroke change × counter count).

[0039] Please see Figure 2 .

[0040] Figure 2 A complete flowchart of a control method for a finishing mill according to an embodiment of this application is shown, as follows: Figure 2 As shown, this application can be performed in accordance with Figure 2 The flowchart is used to control the finishing rolling equipment.

[0041] Step S201: Initialize the working parameters of the work roll, and then execute step S202.

[0042] Step S202: Check the status of the finishing mill. If the finishing mill is in roll changing mode, repeat step S201; otherwise, repeat step S203.

[0043] Step S203: Check the activation status of the flying shear pyrometer and the coil ID status until the flying shear pyrometer is activated and the coil ID status remains unchanged, then proceed to step S204. In this application, the coil ID corresponds to the code of the produced steel coil, such as the coil number. If the coil ID does not change, it means that the steel coil in the current rolling cycle has begun stable rolling, and the roll position needs to be controlled.

[0044] Step S204: Determine the target roller position value based on the roller shifting working parameters, and then execute step S205.

[0045] Step S205: Check the coil ID status. If the coil ID status changes, proceed to step S206. In this application, a change in the coil ID means that the coil for the current rolling cycle has been rolled. At this time, the activation status of the flying shear pyrometer can be switched to deactivated, and preparation can be made for the next rolling cycle.

[0046] Step S206: Increment the counter count once, and proceed to step S207.

[0047] Step S207: Check the overall operating status of the finishing mill. If the overall operating status is that the machine is not stopped, then repeat step S202; otherwise, end the current control.

[0048] In this application, since there are many types of operating parameters for the shifting rollers, there are numerous results for determining the target shifting roller position value based on these parameters. Please refer to the following section. Figure 3 and Figure 4 , combined Figure 3 and Figure 4 Each result is explained in detail.

[0049] Figure 3 A flowchart of a control method for a finishing mill according to an embodiment of this application is shown.

[0050] exist Figure 3 In the process, after obtaining the working parameters of the roller shifting, it is first necessary to determine the relationship between the counter count and the attenuation amount. If the counter count is greater than the attenuation amount, then the normal mode is entered.

[0051] In normal mode, first determine the direction of movement of the work roller.

[0052] To the drive side: The target roller position value can be determined as the actual roller position value plus the attenuated step size. If the target roller position value is greater than the attenuated stroke, the target roller position value is corrected to 2 × attenuated stroke - the current target roller position value, and the direction of the work roller movement is corrected to the work side.

[0053] To the working side: The target roller position value can be determined as the actual roller position value minus the attenuated step size. If the target roller position value is less than the opposite of the attenuated stroke, the target roller position value is corrected to 2 × attenuated stroke - current target roller position value, and the direction of the working roller movement is corrected to the drive side.

[0054] Figure 4 A flowchart of a control method for a finishing mill according to an embodiment of this application is shown.

[0055] exist Figure 4 If the counter count is less than or equal to the decay amount, then the system enters decay mode.

[0056] In the attenuation mode, the direction of the working roll movement is determined first, then the relationship between the actual roll movement position and the current maximum stroke is determined, then the relationship between the actual roll movement position and the internal roll movement stroke is determined, and finally the target roll movement position is determined.

[0057] To the drive side: When the absolute value of the actual roller position is less than or equal to the current maximum stroke, and the absolute value of the actual roller position is less than or equal to the inner roller stroke, the target roller position is determined as the actual roller position plus the inner roller step length.

[0058] To the drive side: When the absolute value of the actual roller position is less than or equal to the current maximum stroke, and the absolute value of the actual roller position is greater than the inner roller stroke, the target roller position is determined as the actual roller position plus the outer roller step. If the target roller position is greater than the current maximum stroke, the target roller position is corrected to 2 × current maximum stroke - current target roller position, and the direction of the work roller movement is corrected to the work side.

[0059] To the working side: When the absolute value of the actual roller position is less than or equal to the current maximum stroke, and the absolute value of the actual roller position is less than or equal to the inner roller stroke, the target roller position is determined as the actual roller position value minus the inner roller step length.

[0060] To the working side: When the absolute value of the actual roller position is less than or equal to the current maximum stroke, and the absolute value of the actual roller position is greater than the inner roller stroke, the target roller position is determined as the actual roller position minus the outer roller step. If the target roller position is less than the opposite of the current maximum stroke, the target roller position is corrected to 2 × current maximum stroke - current target roller position, and the direction of the working roller movement is corrected to the drive side.

[0061] After the implementation of the control method, the probability of compound waves during hot rolling was significantly reduced, improving the quality of the sheet and reducing cost losses caused by compound waves. The comparison results of 10,000 steel pieces before and after the application of this application are shown in Table 2:

[0062] Probability of Complex Waves Failure time (min) Plate type blocking rate Before application 7.5％ 85 7.8％ After application 1.8％ 16 6.5％

[0063] Table 2

[0064] In summary, in the technical solutions provided by some embodiments of this application, the target roll shifting position value is determined based on the roll shifting working parameters, and then the roll shifting operation of the work roll is controlled based on the target roll shifting position value. In continuous production, this ensures that the finishing work roll achieves relatively uniform wear, thereby reducing the probability of compound waves, ensuring strip quality, and improving the stability of hot-rolled strip rolling.

[0065] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the embodiments disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein.

[0066] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A control method for a finishing mill, the finishing mill comprising work rolls and a flying shear pyrometer, characterized in that, The method includes: After switching the flying shear pyrometer to the active state, the working parameters of the working roll are obtained; Determine the target roller position value based on the roller shifting operating parameters; Based on the target roll position value, control the roll shifting operation of the work roll; The operating parameters of the roller include: Maximum roll movement, inner roll movement, inner roll movement step length, outer roll movement step length, counter count, actual roll movement position value, attenuation quantity, attenuated stroke, attenuated step length, direction of work roll movement, change in attenuation stroke, current maximum stroke; Determining the target roller position value based on the roller operating parameters includes: If the direction of the working roller movement is towards the drive side, and the counter count is greater than the attenuation amount, the target roller position value is the sum of the actual roller position value and the attenuated step size; If the current target roller position value is greater than the attenuated stroke, the target roller position value is corrected to twice the difference between the attenuated stroke and the current target roller position value, and the direction of the work roller movement is corrected to the working side; If the direction of the working roller movement is towards the working side, and the counter count is greater than the attenuation amount, the target roller position value is the difference between the actual roller position value and the attenuated step size; If the current target roller position value is less than the opposite of the attenuated stroke, the target roller position value is corrected to twice the difference between the attenuated stroke and the current target roller position value, and the direction of the work roller movement is corrected to the drive side; If the direction of the working roller movement is towards the drive side, and the counter count is less than or equal to the attenuation amount, and the absolute value of the actual roller position value is less than or equal to the current maximum stroke, and the absolute value of the actual roller position value is less than or equal to the internal movement stroke, then the target roller position value is the sum of the actual roller position value and the internal movement step size. If the direction of the working roller movement is towards the drive side, and the counter count is less than or equal to the attenuation amount, and the absolute value of the actual roller position value is less than or equal to the current maximum stroke, and the absolute value of the actual roller position value is greater than the inner roller movement stroke, then the target roller position value is the sum of the actual roller position value and the outer roller movement step size. If the current target roller position value is greater than the current maximum stroke, then the target roller position value is corrected to twice the difference between the current maximum stroke and the current target roller position value, and the direction of the work roller movement is corrected to the working side; If the direction of the working roller movement is towards the working side, and the counter count is less than or equal to the attenuation amount, and the absolute value of the actual roller position value is less than or equal to the current maximum stroke, and the absolute value of the actual roller position value is less than or equal to the inner movement stroke, then the target roller position value is the difference between the actual roller position value and the inner movement step size. If the direction of the working roller movement is towards the working side, and the counter count is less than or equal to the attenuation amount, and the absolute value of the actual roller position value is less than or equal to the current maximum stroke, and the absolute value of the actual roller position value is greater than the inner roller stroke, then the target roller position value is the difference between the actual roller position value and the outer roller step size. If the current target roller position value is less than the opposite of the current maximum stroke, the target roller position value is corrected to twice the difference between the current maximum stroke and the current target roller position value, and the direction of the work roller movement is corrected to the drive side.

2. The method according to claim 1, characterized in that, Before switching the flying shear pyrometer to the active state, the method includes: Initialize the working parameters of the work roll.

3. The method according to claim 1, characterized in that, After determining the target roll position value based on the roll shifting operating parameters, the method further includes: Switching the flying shear pyrometer to the inactive state increments the counter count by one.

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