A finish rolling double-steel tracking control method and system

Abstract

The application provides a finishing double-steel tracking control method and system, comprising: when a current strip steel is gripped by a first rack of a finishing mill, presetting data of the current strip steel in a second finishing is stored in a first preset storage area, so that the current strip steel is rolled according to the data stored in the first preset storage area, wherein the presetting data of the second finishing is determined based on the actual sampling temperature of the intermediate blank head at the entrance of the finishing mill; when the current strip steel is thrown by the first rack of the finishing mill, the data in the first preset storage area is stored in a second preset storage area, and the first preset storage area is emptied; and after the current strip steel is thrown by the last rack of the finishing mill for more than a preset time, the second preset storage area is emptied, wherein the preset time is less than the time interval between two adjacent times of storing the data in the first preset storage area into the second preset storage area. The application can realize accurate tracking and control of the finishing double-steel, and effectively improve the rolling rhythm and yield of the finishing mill.

Description

Technical Field

[0001] This invention relates to the field of steel production applications, and in particular to a method and system for tracking and controlling two steel bars in a precision rolling mill. Background Technology

[0002] The existing finishing mills in the hot-rolled coil production line of the steel rolling mill cannot achieve dual-strip tracking and quality control. That is, the finishing mill cannot roll two strips at the same time. Before the tail of the previous strip has been finished and discarded, the next intermediate billet is not allowed to enter the finishing mill F1 stand for bite rolling. Due to the fast production and rolling rhythm of the production line, it often happens that before the previous strip has been finished and discarded, the next intermediate billet has already entered the high-temperature gauge area of ​​the finishing mill entrance and has normally issued the secondary preset data for finishing. This causes the secondary setting parameters for strip executed by the front stand and the rear stand to be different during the finishing strip threading process, resulting in a mismatch in the flow rate between the stands during the strip head threading process, causing the billet to clump together. Summary of the Invention

[0003] In view of the problems existing in the prior art, the present invention proposes a tracking control method and system for finishing mill double steel, which mainly solves the problem that the existing control system cannot meet the requirements for accurate tracking and control of finishing mill double steel, thus affecting the rolling rhythm and efficiency improvement of the production line.

[0004] To achieve the above and other objectives, the technical solution adopted by the present invention is as follows.

[0005] This application provides a finishing mill double-strip tracking control method, comprising: when the current strip bites into the first stand of the finishing mill, transferring the finishing mill secondary preset data of the current strip to a first preset storage area, so as to roll the current strip according to the data stored in the first preset storage area, wherein the finishing mill secondary preset data is determined based on the actual sampling temperature of the intermediate billet head at the finishing mill entrance; when the current strip is rejected at the first stand of the finishing mill, transferring the data in the first preset storage area to a second preset storage area and clearing the first preset storage area; after the rejection at the last stand of the finishing mill exceeds a preset time, clearing the second preset storage area, wherein the preset time is less than the time interval between two adjacent transfers of data from the first preset storage area to the second preset storage area.

[0006] In one embodiment of this application, before transferring the current strip finishing mill secondary preset data to the first preset storage area, the following steps are further included: tracking the position of the intermediate billet head according to the high temperature meter sampling signal at the finishing mill entrance to obtain first position tracking data; storing the first position tracking data into the first preset storage area to locate the head of the current strip according to the first position tracking data.

[0007] In one embodiment of this application, before transferring the data from the first preset storage area to the second preset storage area, the following steps are further included: tracking the position of the tail of the intermediate billet according to the steel throwing signal of the first stand of the finishing mill to obtain second position tracking data; storing the second position tracking data into the second preset storage area to locate the tail of the current strip steel according to the second position tracking data.

[0008] In one embodiment of this application, the current strip and the previous strip are of the same specification.

[0009] In one embodiment of this application, before transferring the current strip finishing mill secondary preset data to the first preset storage area, the following steps are further included: configuring the calibration time of the measuring instrument so that when the first stand of the finishing mill bites the steel, the corresponding measuring instrument acquires the measurement data according to the calibration time.

[0010] In one embodiment of this application, the current strip thickness is greater than a preset thickness.

[0011] This application also provides a finishing mill double-strip tracking control system, comprising: a head tracking setting module, used to transfer the finishing mill secondary preset data of the current strip to a first preset storage area when the current strip bites at the first stand of the finishing mill, so as to roll the current strip according to the data stored in the first preset storage area, wherein the finishing mill secondary preset data is determined based on the actual sampling temperature of the intermediate billet head at the finishing mill entrance; a tail tracking setting module, used to transfer the data in the first preset storage area to a second preset storage area and clear the first preset storage area when the current strip throws at the first stand of the finishing mill; and a setting data management module, used to clear the second preset storage area after the throwing at the last stand of the finishing mill exceeds a preset time, wherein the preset time is less than the time interval between two adjacent transfers of data from the first preset storage area to the second preset storage area.

[0012] As described above, the present invention provides a tracking control method and system for precision rolling of two steel bars, which has the following beneficial effects.

[0013] This application can transfer the pre-set secondary data of the finishing mill to different data storage areas based on the bite and throw signals of the first and last stands of the finishing mill. Each data storage area operates relatively independently, which can effectively avoid the problem of mismatch between the secondary setting parameters of the front and rear stands and the stacking of steel when the finishing mill is rolling two strips. It can realize that the next strip is biting at the finishing mill before the previous strip is thrown, and ensure the effective storage and execution of the secondary setting parameters of the finishing mill for the two strips rolled at the same time. It can realize accurate tracking and control of the finishing mill, avoid the recurrence of the stacking of steel due to mismatch between the flow rates between the finishing mill stands when the rolling rhythm is fast, and effectively improve the overall rolling rhythm and output of the production line. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the rolling direction of precision-rolled strip steel.

[0015] Figure 2 This is a flowchart illustrating the tracking control method for double steel bars in a precision rolling mill according to one embodiment of this application.

[0016] Figure 3 This is a block diagram of a precision rolling double steel tracking control system in one embodiment of this application. Detailed Implementation

[0017] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0018] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0019] The inventor discovered through research that:

[0020] The existing hot strip rolling process control technology has the following problems:

[0021] 1. The existing control technology of the finishing mill does not meet the requirements of dual steel tracking and quality control. When the rolling rhythm is too fast, the next intermediate billet stops in front of the finishing mill inlet pyrometer and waits until the previous strip steel is discarded on the finishing mill F7 stand before it can enter the finishing mill inlet pyrometer area and the finishing mill F1 stand for rolling, which affects the rolling rhythm of the production line and the capacity improvement.

[0022] 2. If the tail of the previous strip has not yet left the F7 stand, and the next intermediate billet bites into the F1 stand, the finishing mill F4-F7 stands will not execute the secondary setting parameters for the next strip, but will still execute the setting parameters for the previous one. When changing specifications, this will directly cause the flow rate in the finishing mill stands to be mismatched, resulting in the stacking of steel.

[0023] Based on the problems existing in the prior art, this application proposes a tracking control method and system for precision rolling double steel. The technical solution of this application will be described in detail below with reference to specific embodiments.

[0024] Please see Figure 1 , Figure 1This diagram illustrates the rolling direction of the finishing strip. A pyrometer is installed at the finishing mill inlet. The strip sequentially passes through the finishing mill inlet pyrometer, the finishing descaling box, and the finishing mill stands F1-F7 to complete the rolling process. The finishing mill rolling process requires equipment control based on the primary and secondary pre-set parameters. The primary pre-set parameter is calculated using the measured temperature of the intermediate slab in the roughing mill to determine the temperature at the finishing mill inlet pyrometer. The secondary pre-set parameter is calculated using the actual sampled values ​​from the pyrometer at the finishing mill inlet. The parameters used in this calculation include the roll gap, rolling force, speed, and looper parameters for each stand. The specific parameters are determined based on actual production needs and are not limited here.

[0025] Please see Figure 2 , Figure 2 This is a flowchart illustrating a method for tracking and controlling two steel bars in a precision rolling mill, as described in one embodiment of this application. The method includes the following steps:

[0026] Step 200: When the current strip is bitten on the first stand of the finishing mill, the pre-set data of the current strip for finishing milling is transferred to the first preset storage area, so as to roll the current strip according to the data stored in the first preset storage area, wherein the pre-set data for finishing milling is determined based on the actual sampling temperature of the head of the intermediate billet at the entry of the finishing mill.

[0027] In one embodiment, when the head of the intermediate billet reaches the detection area of ​​the high-temperature gauge at the finishing mill inlet, the actual temperature of the intermediate billet head is sampled and fed back to the control system. The control system performs secondary pre-setting of the finishing mill based on the temperature sampled by the high-temperature gauge, obtains secondary pre-setting data for the finishing mill, and sends the secondary pre-setting data to the finishing mill equipment for execution. The control system stores the secondary pre-setting data for the finishing mill in the data buffer area B2. At the current first stand of the strip finishing mill (i.e....) Figure 1 When the strip head of the finishing mill (F1 stand) bites the strip, a bite signal is generated, indicating that the strip head has reached the finishing mill F1 stand. After receiving the bite signal, the finishing mill secondary preset data stored in the data buffer area B2 can be transferred to the first preset storage area B3. At this time, the finishing mill F1-F7 stand equipment executes the data set in the first preset storage area.

[0028] In one embodiment, before transferring the current strip's pre-set secondary finishing mill data to the first preset storage area, the method further includes the following steps: tracking the position of the intermediate billet head based on the high-temperature meter sampling signal at the finishing mill inlet to obtain first position tracking data; storing the first position tracking data into the first preset storage area to perform head positioning of the current strip based on the first position tracking data.

[0029] Specifically, when the intermediate billet reaches the pyrometer at the entrance of the finishing mill, the pyrometer will generate a high level to indicate that the head of the intermediate billet has entered the detection area of ​​the pyrometer. Based on the time point of the detected signal change and the speed of the roller conveyor, the position of the head of the intermediate billet can be tracked to obtain the first position tracking data. This first position tracking data is stored in the buffer area M1 as the head tracking data of the current strip. When the current strip bites the first stand of the finishing mill, the tracking data in the buffer area M1 is transferred to the first preset storage area B3 so that the control system can track and position the head of the current strip according to the current strip position tracking data, thereby ensuring the accurate tracking and quality control of the current strip.

[0030] In step S210, when the first stand of the finishing mill throws out the steel, the data in the first preset storage area is transferred to the second preset storage area so that the corresponding finishing mill stand can roll the current strip steel according to the data stored in the second preset storage area.

[0031] In one embodiment, a strip rejection signal is generated when the strip is rejected on the first stand of the finishing mill. Rejection on the first stand indicates that the tail of the strip has left the first stand. The strip rejection signal and the rejection signal can be determined by detecting the rolling force of the corresponding finishing mill stand; alternatively, they can be identified by other sensor modules, which is not limited here. During strip rejection on the first stand, data in the first preset storage area B3 is transferred to the second preset storage area B4. After the data transfer, the first preset storage area is cleared, ready to receive the pre-set data for the next strip's finishing mill pass. After strip rejection on the first stand, the finishing mill stands F4-F7 continue rolling according to the pre-set data stored in the second preset storage area B4 until strip rejection on the last stand. During the rolling process of the finishing mill stands F4-F7 according to the data stored in the second preset storage area B4, if the next strip is bitten by the finishing mill stand F1, the first preset storage area B3 receives the second preset data for the finishing mill of the next strip. This allows the finishing mill stands F1-F3 to roll the next strip according to the data stored in the first preset storage area B3, thereby achieving simultaneous finishing mill rolling of two strips. The data in the first preset storage area B3 is relatively independent from the data in the second preset storage area B4, ensuring normal control of the finishing mill equipment during double-strip rolling, thereby improving the rolling rhythm and capacity of the production line.

[0032] In one embodiment, before transferring the data from the first preset storage area to the second preset storage area, the method further includes the following steps: tracking the tail position of the current strip based on the steel throwing signal of the first stand of the finishing mill to obtain second position tracking data; storing the second position tracking data in the second preset storage area to perform tail positioning of the current strip based on the second position tracking data.

[0033] Specifically, to avoid the mismatch between the pre-set data of the finishing mill when two steel bars are rolled simultaneously, after the steel is thrown from the first stand of the finishing mill, the tail of the current strip can be tracked and positioned based on the current tail position and rolling speed to obtain the second position tracking data. The second position tracking data is then stored in the second preset storage area B4. This allows the control system to determine whether the current finishing mill is rolling two steel bars simultaneously, and whether the secondary setting data of the finishing mill matches the strip, based on the head tracking data in the first preset storage area and the tail tracking data in the second preset storage area.

[0034] Step S220: After the steel is thrown from the finishing mill stand for a preset time, the second preset storage area is cleared, wherein the preset time is less than the time interval between two adjacent transfers of data from the first preset storage area to the second preset storage area.

[0035] In one embodiment, at the finishing mill stand (i.e. Figure 1 When the strip is discarded at the finishing mill stand (F7 stand shown), it indicates that the current strip has completed finishing rolling. The second preset storage area B4 can be cleared after a preset delay to allow for the reception of the second preset data for the finishing rolling of the next strip during double-strand rolling. While the current strip is discarded at the last finishing mill stand, the next strip is rolled between finishing mill stands F1 to F3. The tail end of the next strip has not yet been discarded at the first finishing mill stand. Therefore, the data in the first preset storage area B3 and the second preset storage area B4 can operate relatively independently, and the execution of the finishing mill equipment settings will not be prominent.

[0036] In one embodiment, the current strip and the previous strip are of the same specification. Specifically, during the finishing rolling of two strips, the two strips should ideally be of the same specification. This results in a shorter set stroke and shorter execution cycle for the finishing rolling equipment, quickly meeting the demands of fast-paced production. Of course, the strip specifications can also be changed according to actual production needs, making the previous strip different from the current strip. Specific strip specifications are not limited here.

[0037] In one embodiment, the current strip thickness is greater than a preset thickness. Specifically, when producing extremely thin specifications (e.g., 1.2-2.0 mm thick products), accurate tracking and rolling of the double steel in the finishing mill cannot be achieved because the work rolls are already pressed together when the finishing mill F4-F7 stands execute the set roll gap. At this time, the roll gap needs to be raised before the roll shifting stroke is executed, and the very small set roll gap needs to be quickly restored after the roll shifting is completed. The roll shifting stroke execution of extremely thin specifications cannot meet the fast-paced production requirements of the finishing mill double steel. Therefore, a preset thickness can be set. When the strip thickness is greater than the preset thickness, it is considered that the current strip can meet the double steel rolling requirements.

[0038] In one embodiment, before transferring the pre-set data from the finishing mill to the first preset storage area, the method further includes the following step: configuring the calibration time of the measuring instruments so that when the first stand of the finishing mill bites the steel, the corresponding measuring instruments acquire measurement data according to the calibration time. The specific calibration time can be configured according to actual measurement needs and is not limited here. By optimizing the calibration time of the thickness gauge and the multi-function instrument, the problem of the instruments failing to measure thickness, width, etc., due to calibration timeout during the steel biting start of the finishing mill F1 stand can be solved.

[0039] Please see Figure 3 , Figure 3 This is a block diagram of a finishing mill double steel tracking control system according to one embodiment of this application. This embodiment provides a finishing mill double steel tracking control system for executing the finishing mill double steel tracking control method described in the foregoing method embodiments. Since the technical principles of the system embodiment are similar to those of the foregoing method embodiments, the same technical details will not be repeated.

[0040] In one embodiment, a finishing mill double-strip tracking control system includes: a head tracking setting module 30, used to transfer the finishing mill secondary preset data of the current strip to a first preset storage area when the current strip bites at the first stand of the finishing mill, so as to roll the current strip according to the data stored in the first preset storage area, wherein the finishing mill secondary preset data is determined based on the actual sampling temperature of the intermediate billet head at the finishing mill entrance; a tail tracking setting module 31, used to transfer the data in the first preset storage area to a second preset storage area and clear the first preset storage area when the current strip is thrown at the first stand of the finishing mill; and a setting data management module 32, used to clear the second preset storage area after the throwing at the last stand of the finishing mill exceeds a preset time, wherein the preset time is less than the time interval between two adjacent transfers of data from the first preset storage area to the second preset storage area.

[0041] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A method for tracking and controlling two steel bars in a precision rolling mill, characterized in that, include: When the current strip is bitten on the first stand of the finishing mill, the pre-set data of the current strip for finishing milling is transferred to the first preset storage area, so as to roll the current strip according to the data stored in the first preset storage area. The pre-set data for finishing milling is determined based on the actual sampling temperature of the head of the intermediate billet at the entry of the finishing mill. When the current strip is discarded from the first stand of the finishing mill, the data in the first preset storage area is transferred to the second preset storage area, and the first preset storage area is cleared. A discard signal is generated when the strip is discarded from the first stand of the finishing mill, indicating that the tail of the current strip has left the first stand. The bite signal and the discard signal are determined by detecting the rolling force of the corresponding finishing mill stand. When the strip is discarded from the first stand of the finishing mill, the data in the first preset storage area is transferred to the second preset storage area. After the data transfer, the first preset storage area is cleared to prepare for receiving the next strip in the finishing mill. Secondary preset data; after the first stand of the finishing mill discards the steel, the finishing mill stands F4-F7 continue rolling according to the secondary preset data stored in the second preset storage area until the last stand of the finishing mill discards the steel; during the rolling process of the finishing mill stands F4-F7 according to the data stored in the second preset storage area, if the next strip of steel is bitten by the finishing mill stand F1, the first preset storage area receives the secondary preset data of the next strip of steel, so that the next strip of steel is rolled according to the data stored in the first preset storage area B3, thereby realizing the simultaneous rolling of two strips of steel in the finishing mill; After the steel is thrown from the finishing mill stand for a period of time, the second preset storage area is cleared, wherein the preset time is less than the time interval between two consecutive transfers of data from the first preset storage area to the second preset storage area.

2. The method for tracking and controlling twin steel bars in a precision rolling mill according to claim 1, characterized in that, Before transferring the current pre-set data for strip finishing to the first preset storage area, the following steps are also included: The position of the intermediate billet head is tracked based on the high temperature gauge sampling signal at the entrance of the finishing mill to obtain the first position tracking data; The first position tracking data is stored in the first preset storage area to perform head positioning of the current strip steel based on the first position tracking data.

3. The method for tracking and controlling twin steel bars in a precision rolling mill according to claim 1, characterized in that, Before transferring the data from the first preset storage area to the second preset storage area, the following steps are also included: The position of the tail of the intermediate billet is tracked based on the steel throwing signal of the first stand of the finishing mill to obtain the second position tracking data; The second position tracking data is stored in the second preset storage area to perform tail positioning of the current strip steel based on the second position tracking data.

4. The finishing mill double steel tracking control method according to claim 3, characterized in that, The current strip is of the same specification as the previous strip.

5. The method for tracking and controlling twin steel bars in a precision rolling mill according to claim 1, characterized in that, Before transferring the current strip finishing mill secondary preset data to the first preset storage area, the following steps are also included: Configure the calibration time of the measuring instruments so that when the first stand of the finishing mill bites the steel, the corresponding measuring instruments acquire measurement data according to the calibration time.

6. The method for tracking and controlling twin steel bars in a precision rolling mill according to claim 1, characterized in that, The current strip thickness is greater than the preset thickness.

7. A precision rolling mill dual-steel tracking control system, characterized in that, include: The head tracking setting module is used to transfer the pre-set data of the current strip to the first preset storage area when the current strip bites into the first stand of the finishing mill, so as to roll the current strip according to the data stored in the first preset storage area, wherein the pre-set data of the finishing mill is determined based on the actual sampling temperature of the head of the intermediate billet at the entry of the finishing mill. The tail tracking setting module is used to transfer data from the first preset storage area to the second preset storage area and clear the first preset storage area when the current strip is discarded from the first stand of the finishing mill. When the strip is discarded from the first stand of the finishing mill, a discard signal is generated, indicating that the tail of the current strip has left the first stand. The bite signal and the discard signal are determined by detecting the rolling force of the corresponding finishing mill stand. When the strip is discarded from the first stand of the finishing mill, the data in the first preset storage area is transferred to the second preset storage area. After the data transfer, the first preset storage area is cleared to prepare for receiving the next... The pre-set data for the finishing of strip steel is used. After the first stand of the finishing mill discards the steel, the finishing mill stands F4-F7 continue rolling according to the pre-set data for the second finishing mill stored in the second preset storage area until the last stand of the finishing mill discards the steel. During the rolling process of the finishing mill stands F4-F7 according to the data stored in the second preset storage area, if the next strip steel is bitten by the finishing mill stand F1, the first preset storage area receives the pre-set data for the second finishing of the next strip steel, so that the next strip steel is rolled according to the data stored in the first preset storage area B3, thereby realizing the simultaneous rolling of two strip steels in the finishing mill. A data management module is configured to clear the second preset storage area after the steel is thrown from the finishing mill stand for a preset time, wherein the preset time is less than the time interval between two consecutive transfers of data from the first preset storage area to the second preset storage area.

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