A roughing full continuous rolling micro-tension control method

Abstract

The application discloses a rough rolling full continuous rolling micro-tension control method, and belongs to the technical field of hot continuous rolling automation control engineering, which comprises the following steps: after the steel is gripped by an upstream stand, the flat radius locking value and the rolling force arm locking value of the upstream stand are calculated; after the steel is gripped by a downstream stand, the tension between the upstream stand and the downstream stand is calculated based on the flat radius locking value and the rolling force arm locking value of the upstream stand; and the tension control between the upstream stand and the downstream stand is realized based on the calculated tension between the upstream stand and the downstream stand after a delay of n seconds from the time when the steel is gripped by the downstream stand. The scheme can improve the stability and precision of the tension control between the rough rolling full continuous rolling stands, solve the problems of strip narrowing or over-width in the full continuous rolling, and further improve the precision of the finished product quality in the full continuous rolling.

Description

Technical Field

[0001] This invention relates to the field of automated control engineering technology for hot continuous rolling, and in particular to a micro-tension control method for continuous roughing rolling. Background Technology

[0002] In the hot continuous rolling process, the continuous rolling method of roughing mill greatly improves the rolling rhythm of the roughing mill area. However, how to coordinate the tension relationship between multiple stands is a crucial point in the continuous rolling process. If the tension between stands is too large, it will cause the steel to be pulled as a whole, and the exit width will become narrow. If the tension between stands is too small, steel will pile up, and the exit width will be too wide. If the steel pile up is serious, it will lead to the steel being de-scrambled between stands and scrapped steel, which will not only reduce the product quality, but also cause safety accidents in severe cases.

[0003] The matching relationship between stands in traditional continuous rolling mills mainly relies on a two-stage speed setting model and manual speed cascade adjustment. Once there are fluctuations in temperature, changes in rolling force, or changes in rolling specifications, it cannot respond well to the problems caused by these changes. This results in great uncertainty and inaccuracy, and the quality of the product cannot be well guaranteed.

[0004] Therefore, in the continuous roughing rolling process, micro-tension control is required to ensure the tension accuracy and stability during the multi-stand continuous rolling process, thereby solving the product quality problem. Summary of the Invention

[0005] This invention provides a micro-tension control method for continuous roughing rolling to solve the problems caused by existing technologies that cannot respond well to temperature fluctuations, changes in rolling force, and changes in rolling specifications, thus resulting in significant uncertainty and inaccuracy, and the inability to effectively guarantee product quality.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0007] On one hand, this invention provides a micro-tension control method for continuous roughing mills, applicable to continuous roughing mill units, wherein the continuous roughing mill unit includes: a vertical roll mill and a horizontal roll mill; the continuous roughing mill unit uses a two-stage speed setting model combined with manual speed cascade adjustment to perform speed setting; the method includes:

[0008] After the i-th stand bites the steel, the flat radius locking value and rolling lever locking value of the i-th stand are calculated; where i represents the stand number, and each stand in the roughing continuous rolling mill is sequentially numbered. The stand number is an integer value starting from 1, i = 1, 2, ..., Q-1; Q represents the number of the last stand in the roughing continuous rolling mill.

[0009] After the steel is bitten on the (i+1)th stand, the tension between the i-th stand and the (i+1)th stand is calculated based on the flat radius locking value and rolling lever arm locking value of the i-th stand.

[0010] Starting from the (i+1)th rack engaging the steel, after a delay of n seconds, tension control between the i-th rack and the (i+1)th rack is achieved based on the calculated tension between them.

[0011] Furthermore, with the final frame speed as the maximum speed setting, the secondary speed setting model is expressed as follows:

[0012]

[0013] Among them, v R f indicates the speed of a flat roll mill. 末 Indicates the forward slip value of the last stand; f represents the forward slip value of any flat roll mill; h 出 Indicates the thickness at the exit of the final frame; h 入 Indicates the exit thickness of any flat roll mill; v 末 Indicates the speed of the final rack; v E Indicates the speed of the vertical rolling mill; β R Indicates the backslip value of the flat roller; f E This indicates the forward slip value of the vertical roller.

[0014] Furthermore, the artificial speed cascade adjustment includes:

[0015] After the (i+1)th frame engages the steel, the speed of the ith frame is manually adjusted to achieve tension matching between the (i+1)th frame and the ith frame. Furthermore, the speed intervention of the ith frame is cascaded and added to the preceding frames in percentage form; the formula for this cascaded speed addition is expressed as:

[0016] v i =v 设 ·(1+α i +α i+1 )

[0017] Among them, v i v is the speed of the i-th rack; 设 α is the speed of the i-th rack set by the two-stage speed setting model; i α represents the percentage of manual intervention for the i-th rack. i+1 This represents the percentage of manual intervention for the (i+1)th rack.

[0018] Further, after the i-th stand bites the steel, calculating the flat radius locking value and rolling lever arm locking value of the i-th stand includes:

[0019] When the i-th stand bites the steel and the (i+1)-th stand does not bite the steel, the torque and rolling force of the i-th stand are collected, and the acceleration and deceleration torque of the i-th stand is calculated in real time, thereby calculating the rolling torque of the i-th stand.

[0020] Based on the rolling force and rolling torque of the i-th stand, the rolling lever arm of the i-th stand is calculated.

[0021] Starting from the biting of steel in the i-th stand, after a delay of n seconds, the rolling lever arm and flat radius of the i-th stand are sampled for a preset duration according to a preset sampling period;

[0022] The average value of the sampling results of the rolling arm is used as the rolling arm locking value of the i-th stand, and the average value of the sampling results of the flat radius is used as the flat radius locking value of the i-th stand.

[0023] Furthermore, the rolling torque M of the i-th stand F The calculation formula is:

[0024] M F =MM D -T B ·R B

[0025] Where M is the torque of the i-th rack sampled in real time; M D T represents the acceleration / deceleration torque of the i-th frame; B This is the back tension value; for the first frame, its corresponding T is... B The value is 0; R B This is the lever arm value corresponding to the back tension.

[0026] Furthermore, the formula for calculating the rolling lever arm R' of the i-th stand is:

[0027]

[0028] Among them, M F Let F be the rolling torque of the i-th stand; F is the real-time sampled value of the rolling force of the i-th stand.

[0029] Furthermore, the tension T between the i-th rack and the (i+1)-th rack S The calculation formula is:

[0030]

[0031] Among them, M F Let be the rolling torque of the i-th stand; F is the real-time sampled value of the rolling force of the i-th stand; The rolling lever arm locking value for the i-th stand; R is the flat radius locking value for the i-th rack; SR0' is the lever arm value corresponding to the pre-tension; R0' is the real-time value of the flat radius of the i-th frame.

[0032] Furthermore, the tension control between the i-th rack and the (i+1)-th rack based on the calculated tension between the i-th rack and the (i+1)-th rack includes:

[0033] Obtain the setpoint T of the tension between the i-th rack and the (i+1)-th rack. aim ;

[0034] The calculated tension between the i-th rack and the (i+1)-th rack is compared with T. aim The difference is taken as the tension deviation; then the tension controller is enabled, and the speed adjustment corresponding to the i-th frame is obtained based on the tension deviation.

[0035] On the other hand, the present invention also provides a micro-tension control system for continuous roughing rolling, the micro-tension control system for continuous roughing rolling includes a processor and a memory; wherein, the memory stores at least one instruction, the instruction is loaded and executed by the processor to implement the above method.

[0036] In another aspect, the present invention also provides a computer-readable storage medium storing at least one instruction, which is loaded and executed by a processor to implement the above method.

[0037] The beneficial effects of the technical solution provided by this invention include at least the following:

[0038] The technical solution provided by this invention, in addition to employing the traditional two-stage speed setting model and manual cascade speed intervention in the roughing continuous rolling system, also utilizes an indirect tension control method. This indirect tension control method considers that the rolling lever arm changes with the rolling force, and uses a locking and optimizing lever arm approach to calculate the tension between each stand relatively accurately, thereby enabling closed-loop tension adjustment. The implementation of tension control eliminates the influence of temperature fluctuations, rolling force variations, and uneven heating in the furnace on the strip, significantly improving the stability and accuracy of tension control between stands in the roughing continuous rolling mill. This solves the problem of strip narrowing or becoming excessively wide in continuous rolling, thereby improving the precision of finished product quality in continuous rolling. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1This is a schematic diagram of a continuous roughing mill.

[0041] Figure 2 This is a schematic flowchart of the micro-tension control method for continuous roughing mill provided in an embodiment of the present invention;

[0042] Figure 3 This is a schematic diagram of the tension calculation between stands in a roughing mill provided in an embodiment of the present invention;

[0043] Figure 4 This is a structural block diagram of the micro-tension control system for continuous roughing mill provided in an embodiment of the present invention. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0045] First, it should be noted that in the embodiments of the present invention, the words "exemplarily," "for example," etc., are used to indicate that they are examples, illustrations, or descriptions. Any embodiment or design scheme described as "exemplary" in the present invention should not be construed as being more preferred or advantageous than other embodiments or design schemes. Specifically, the use of the term "exemplarily" is intended to present the concept in a specific manner. Furthermore, in the embodiments of the present invention, the meaning expressed by "and / or" can be both, or it can be either one or the other.

[0046] First Embodiment

[0047] This embodiment provides a micro-tension control method for continuous roughing mills. It employs indirect tension control, accurately calculating the tension between each stand, and using a tension closed-loop system to adjust the speed of the upstream stand, thereby achieving stable tension between the continuous mill stands. The execution flow is as follows: Figure 2 As shown. This method is applicable to continuous roughing mills. Figure 1 A schematic diagram of a roughing mill continuous rolling mill is shown, comprising three vertical roll stands and five horizontal roll stands, arranged as follows: E1→R1→R2→E2→R3→R4→E3→R5. This mill operates on an irreversible rolling principle, and there are no other instruments or equipment between the stands. After the steel bites into the mill, the upstream and downstream mills establish tension, forming a continuous rolling relationship. The tension relationship in continuous rolling is complex; if a mismatch occurs between the tensions of two stands, it can cause overall narrowing or over-width. This problem can be solved using the micro-tension control method for roughing mill continuous rolling described in this embodiment. Specifically, the method includes the following steps:

[0048] S1, the roughing rolling mill unit executes the speed setting according to the two-stage speed setting model;

[0049] Among them, the maximum speed is set with the speed of the last stand of the rolling mill, and the secondary speed setting model is as follows:

[0050]

[0051] Among them, v R f is the speed of the flat roller; 末 f is the forward slip value of the last stand; f is the forward slip value of any flat roll mill; h 出 h is the thickness at the exit of the final frame. 入 For any flat roll mill exit thickness; v 末 v is the velocity of the final rack. E β represents the speed of the vertical rolling mill. R f is the backslip value of the flat roller; E This is the forward slip value of the vertical roller.

[0052] S2, activate manual speed cascade adjustment function;

[0053] It should be noted that this embodiment adopts the idea of ​​prioritizing manual intervention and sets up a manual speed cascade adjustment function. Specifically, after the (i+1)th rack bites the steel, the speed of the i-th rack is manually adjusted to achieve the matching relationship between the (i+1)th rack and the i-th rack. Furthermore, the speed intervention amount of the i-th rack will be cascaded and superimposed on the i-1, i-2, ... racks in the form of a percentage.

[0054] Specifically, the formula for velocity cascading superposition is:

[0055] v i =v 设 ·(1+α i +α i+1 )

[0056] Among them, v i v is the rack speed of this machine. 设 α is the secondary speed setting value of the machine frame obtained according to the secondary speed setting model. i α represents the percentage of manual intervention required for this rack. i+1 Percentage of manual intervention in downstream racks.

[0057] S3, when the upstream stand bites the steel and the downstream stand does not bite the steel, the torque and rolling force of the upstream stand are collected, and its acceleration and deceleration torque are calculated in real time, thereby calculating its rolling torque and rolling lever arm;

[0058] The calculation method for the rolling torque is as follows:

[0059] M F =MM D -T B ·R B

[0060] Among them, M FM is the rolling torque; M is the real-time sampled torque value; M D For acceleration and deceleration torque; T B This is the back tension value; R B This represents the lever arm value corresponding to the back tension. It should be noted that for the first frame, there is no upstream frame, so its back tension is 0.

[0061] The formula for calculating the rolling lever arm is:

[0062]

[0063] Where R' is the rolling lever arm; F is the real-time sampled value of the rolling force of the first stand.

[0064] S4, lock the flat radius and lock the rolling lever arm;

[0065] It should be noted that in this embodiment, both the locking flat radius and the locking rolling arm are calculated by averaging. Specifically, after the upstream stand bites the steel, a delay of n seconds is made, and the flat radius and rolling arm are sampled for 200ms each. The sampling period is based on the program execution cycle, and the sampling time is the first stand biting delay of n seconds, where n can be adjusted. The calculation method for the locking values ​​of the flat radius and rolling arm is as follows:

[0066]

[0067] in, R0' is the flat radius locking value. i The sampled value of the i-th period is the flat radius. R' is the rolling lever arm locking value. i is the sampled value of the rolling lever in the i-th cycle, and N is the number of sampling cycles.

[0068] S5, Computerized inter-rack tension;

[0069] After the downstream stand bites the steel, the real-time rolling force of the upstream stand is sampled, and then the tension value T between the upstream and downstream stands is calculated. S The principle of tension calculation between frames is as follows: Figure 3 As shown. The formula is as follows:

[0070]

[0071] Among them, R S R0' is the lever arm value corresponding to the pre-tension; R0' is the real-time value of the flat radius of the i-th frame.

[0072] S6, after the downstream frame bites the steel, there is a delay of n seconds, where n can be adjusted. At this time, the tension is set to T. aim The tension deviation is T S -T aimEnabling the tension controller allows us to obtain the speed adjustment ΔV corresponding to the upstream stand (this speed adjustment can be obtained through the tension controller, which is a traditional PI controller). Similarly, the tension values ​​between each stand are calculated. After a delay of n seconds following the downstream stand's bite, the tension controller is enabled, and the PI parameters are adjusted according to the tension deviation. This allows for a rapid acquisition of the speed adjustment ΔV corresponding to the upstream stand after the downstream stand bites, thus ensuring tension stability during the continuous rolling process.

[0073] In summary, this embodiment provides a micro-tension control method for continuous roughing mills. First, the mill sets the speed using a two-stage speed setting model. After the upstream stand engages the steel, locking and optimizing the lever arm are employed. Then, after the downstream stand engages the steel, the tension between each stand is calculated relatively accurately. Finally, the tension deviation is used as the control object, and a PI controller is used to adjust it. This control method has been successfully applied to a hot continuous strip steel production line. After implementing the micro-tension control method, the stability and accuracy of tension control between the stands in the continuous roughing mill have been effectively improved, and the impact of temperature fluctuations and rolling force changes on the roughing mill exit width has been reduced.

[0074] Second Embodiment

[0075] This embodiment provides a micro-tension control system for continuous roughing mill rolling, such as... Figure 4 As shown, the system includes a processor and a memory; wherein the processor and the memory can be connected via a communication bus; the memory stores at least one instruction, which is loaded and executed by the processor to implement the method of the first embodiment described above. Furthermore, the system may also include a transceiver, the processor and the transceiver being connected via a communication bus, the transceiver being used to communicate with other devices.

[0076] Below, in conjunction with Figure 4 The following is a detailed description of each component of the system:

[0077] The processor is the control center of the electronic device. The electronic device may include multiple processors, each of which can be a single-core processor (single-CPU) or a multi-core processor (multi-CPU). The term "processor" can refer to a single processor or a collective term for multiple processing elements. For example, a processor can be one or more central processing units (CPUs), other general-purpose processors, application-specific integrated circuits (ASICs), or one or more integrated circuits configured to implement embodiments of the present invention, such as one or more digital signal processors (DSPs), one or more field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor can be a microprocessor or any conventional processor. The processor can perform various functions of the electronic device by running or executing software programs stored in memory and by calling data stored in memory.

[0078] In a specific implementation, as one example, the processor may include one or more CPUs, for example... Figure 4 CPU0 and CPU1 shown are, of course, merely illustrative examples.

[0079] The memory is used to store the software program that executes the solution of the present invention, and the processor controls its execution. For specific implementation methods, please refer to the above method embodiments, which will not be repeated here.

[0080] Optionally, the memory may be a read-only memory (ROM) or other type of static storage device capable of storing static information and instructions, random access memory (RAM) or other type of dynamic storage device capable of storing information and instructions, or electrically erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed discs, laser discs, optical discs, digital universal discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer, but not limited thereto. The memory may be integrated with the processor or exist independently, and may be accessed through the system's interface circuitry (…). Figure 4 (Not shown in the image) is coupled to the processor; however, this embodiment of the invention does not impose specific limitations on this.

[0081] The transceiver may include a receiver and a transmitter. Figure 4 (Not shown separately). The receiver is used to implement the receiving function, and the transmitter is used to implement the transmitting function. The transceiver can be integrated with the processor or exist independently, and can be connected through the system's interface circuit (…). Figure 4 (Not shown in the image) is coupled to the processor, and this embodiment of the invention does not specifically limit this.

[0082] Specifically, the micro-tension control system of the continuous roughing mill in this embodiment adopts a PLC control system. The speed, torque, rolling force, and bite signals are all collected by the PLC and the data is calculated and processed.

[0083] In addition, it should be noted that, Figure 4 The structure of the system shown is not intended to limit the device. Actual devices may include more or fewer components than illustrated, or combine certain components, or have different component arrangements. Furthermore, the technical effects achieved by the system when performing the method of the first embodiment described above can be referenced to the technical effects described in the first embodiment; therefore, they will not be repeated here.

[0084] Third Embodiment

[0085] This embodiment provides a computer-readable storage medium storing at least one instruction, which is loaded and executed by a processor to implement the method of the first embodiment described above. The computer-readable storage medium may be a ROM, random access memory, CD-ROM, magnetic tape, floppy disk, or optical data storage device, etc. The instruction stored therein can be loaded and executed by a processor in a terminal.

[0086] Furthermore, it should be noted that the present invention can be provided as a method, apparatus, or computer program product. Therefore, embodiments of the present invention can take the form of a completely or partially hardware embodiment, a completely or partially software embodiment, or an embodiment combining software and hardware aspects. Moreover, when implemented in software, embodiments of the present invention can take the form of a computer program product implemented on one or more computer-usable storage media containing computer-usable program code. The computer program product includes one or more computer instructions or computer programs. When the computer instructions or computer program are loaded or executed on a computer, all or part of the processes or functions described in the embodiments of the present invention are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any usable medium accessible to a computer or a data storage device such as a server or data center containing one or more sets of usable media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium. A semiconductor medium can be a solid-state drive (SSD).

[0087] Embodiments of the present invention are described with reference to flowchart illustrations and / or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, embedded processor, or other programmable data processing terminal device to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal device, generate instructions for implementing the flowchart illustrations. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0088] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing terminal device to operate in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The functions specified in one or more boxes. These computer program instructions may also be loaded onto a computer or other programmable data processing terminal equipment to cause a series of operational steps to be performed on the computer or other programmable terminal equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable terminal equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0089] It should also be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. The terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element. Furthermore, the term "and / or" is merely a description of 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, and B alone, where A and B can be singular or plural. Additionally, the character " / " in this text generally indicates an "or" relationship between the preceding and following objects, but it can also indicate an "AND / OR" relationship. Please refer to the context for specific interpretations. "At least one" refers to one or more items, while "more than" refers to two or more items. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or multiple items. For example, at least one of a, b, or c can be represented as: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple.

[0090] Furthermore, it is understood that in various embodiments of the present invention, the order of the above-mentioned process numbers does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0091] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0092] In the several embodiments provided by this invention, it should be understood that the disclosed devices, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For instance, the division of functional modules / units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another device, or some features may be ignored or not executed. Furthermore, the shown or discussed mutual couplings or direct couplings or communication connections may be through some interfaces; indirect couplings or communication connections between devices or units may be electrical, mechanical, or other forms. Units described as separate components may or may not be physically separate, and components shown as units may or may not be physical units, i.e., they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs. Additionally, the functional units in the various embodiments of this invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0093] If the method is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0094] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention. It should be pointed out that although preferred embodiments of the present invention have been described, those skilled in the art, once they understand the basic inventive concept of the present invention, can make several improvements and modifications without departing from the principles described herein. These improvements and modifications should also be considered within the scope of protection of the present invention. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the embodiments of the present invention.

Claims

1. A method for micro-tension control in a continuous roughing mill, applicable to a continuous roughing mill unit, wherein the continuous roughing mill unit comprises: Vertical roll mill and horizontal roll mill; The roughing mill uses a two-stage speed setting model combined with manual speed cascade adjustment to perform speed setting; the method is characterized by including: After the i-th stand bites the steel, the flat radius locking value and rolling lever locking value of the i-th stand are calculated; where i represents the stand number, and each stand in the roughing continuous rolling mill is sequentially numbered. The stand number is an integer value starting from 1, i = 1, 2, ..., Q-1; Q represents the number of the last stand in the roughing continuous rolling mill. After the steel is bitten on the (i+1)th stand, the tension between the i-th stand and the (i+1)th stand is calculated based on the flat radius locking value and rolling lever arm locking value of the i-th stand. Starting from the (i+1)th rack engaging the steel, after a delay of n seconds, tension control between the i-th rack and the (i+1)th rack is achieved based on the calculated tension between them.

2. The micro-tension control method for continuous roughing rolling as described in claim 1, characterized in that, The secondary speed setting model, with the final frame speed as the maximum speed setting, is expressed as follows: Among them, v R f indicates the speed of a flat roll mill. 末 Indicates the forward slip value of the last stand; f represents the forward slip value of any flat roll mill; h 出 Indicates the thickness at the exit of the final frame; h 入 Indicates the exit thickness of any flat roll mill; v 末 Indicates the speed of the final rack; v E Indicates the speed of the vertical rolling mill; β R Indicates the backslip value of the flat roller; f E This indicates the forward slip value of the vertical roller.

3. The micro-tension control method for continuous roughing rolling as described in claim 1, characterized in that, The artificial speed cascade adjustment includes: After the (i+1)th frame engages the steel, the speed of the ith frame is manually adjusted to achieve tension matching between the (i+1)th frame and the ith frame. Furthermore, the speed intervention of the ith frame is cascaded and added to the preceding frames in percentage form; the formula for this cascaded speed addition is expressed as: v i =v 设 ·(1+a i +a i+1 ) Among them, v i v is the speed of the i-th rack; 设 α is the speed of the i-th rack set by the two-stage speed setting model; i α represents the percentage of manual intervention for the i-th rack. i+1 This represents the percentage of manual intervention for the (i+1)th rack.

4. The micro-tension control method for continuous roughing rolling as described in claim 1, characterized in that, After the steel is bitten on the i-th stand, the flat radius locking value and rolling arm locking value of the i-th stand are calculated, including: When the i-th stand bites the steel and the (i+1)-th stand does not bite the steel, the torque and rolling force of the i-th stand are collected, and the acceleration and deceleration torque of the i-th stand is calculated in real time, thereby calculating the rolling torque of the i-th stand. Based on the rolling force and rolling torque of the i-th stand, the rolling lever arm of the i-th stand is calculated. Starting from the biting of steel in the i-th stand, after a delay of n seconds, the rolling lever arm and flat radius of the i-th stand are sampled for a preset duration according to a preset sampling period; The average value of the sampling results of the rolling arm is used as the rolling arm locking value of the i-th stand, and the average value of the sampling results of the flat radius is used as the flat radius locking value of the i-th stand.

5. The micro-tension control method for continuous roughing rolling as described in claim 4, characterized in that, The rolling torque M of the i-th stand F The calculation formula is: M F =M-M D -T B ·R B Where M is the torque of the i-th rack sampled in real time; M D T represents the acceleration / deceleration torque of the i-th frame; B This is the back tension value; for the first frame, its corresponding T is... B The value is 0; R B This is the lever arm value corresponding to the back tension.

6. The micro-tension control method for continuous roughing rolling as described in claim 4, characterized in that, The formula for calculating the rolling lever arm R' of the i-th stand is: Among them, M F Let F be the rolling torque of the i-th stand; F is the real-time sampled value of the rolling force of the i-th stand.

7. The micro-tension control method for continuous roughing rolling as described in claim 1, characterized in that, The tension T between the i-th rack and the (i+1)-th rack S The calculation formula is: Among them, M F Let be the rolling torque of the i-th stand; F is the real-time sampled value of the rolling force of the i-th stand; The rolling lever arm locking value for the i-th stand; R is the flat radius locking value for the i-th rack; S R0' is the lever arm value corresponding to the pre-tension; R0' is the real-time value of the flat radius of the i-th frame.

8. The micro-tension control method for continuous roughing rolling as described in claim 1, characterized in that, The tension control between the i-th rack and the (i+1)-th rack, based on the calculated tension, includes: Obtain the setpoint T of the tension between the i-th rack and the (i+1)-th rack. aim ; The calculated tension between the i-th rack and the (i+1)-th rack is compared with T. aim The difference is taken as the tension deviation; then the tension controller is enabled, and the speed adjustment corresponding to the i-th frame is obtained based on the tension deviation.

9. A micro-tension control system for continuous roughing mill, the system comprising a processor and a memory; wherein, The memory stores at least one instruction, characterized in that the instruction is loaded and executed by the processor to implement the micro-tension control method for continuous roughing rolling as described in any one of claims 1 to 8.

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