CN114700377A - Method and system for controlling end-off rolling - Google Patents
Method and system for controlling end-off rolling Download PDFInfo
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- CN114700377A CN114700377A CN202210309944.1A CN202210309944A CN114700377A CN 114700377 A CN114700377 A CN 114700377A CN 202210309944 A CN202210309944 A CN 202210309944A CN 114700377 A CN114700377 A CN 114700377A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B39/14—Guiding, positioning or aligning work
- B21B39/16—Guiding, positioning or aligning work immediately before entering or after leaving the pass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/72—Rear end control; Front end control
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Abstract
The invention provides a method and a system for controlling end-off rolling, wherein the method comprises the following steps: acquiring the tail residual length of a rolled piece at a middle rolling inlet and the head length of the rolled piece at a rough rolling outlet; calculating the distance between the head part and the tail part between two rolled pieces according to the distance between the racks, the residual length of the tail part and the length of the head part; and if the distance between the head and the tail is smaller than a first preset distance threshold, the speed of the rough rolling unit is reduced to be slower than the speed of the middle rolling inlet in a cascade mode. The system is used for executing the method. The method and the system for controlling the end-off rolling can avoid the rolled piece rear-end collision accident in the end-off rolling process, and can improve the production efficiency by reducing the speed of the roughing mill set to be lower than the speed of the middle rolling inlet in a cascade mode without increasing the tapping time interval.
Description
Technical Field
The invention relates to the technical field of steel production control, in particular to a method and a system for controlling end-off rolling.
Background
And (4) end-off rolling, namely, no continuous rolling relation occurs between the rough rolling mill set and the middle rolling mill set. The end-off rolling is applied because of the advantages that the proper section size of the billet can be selected according to the requirement; the method can improve the entry speed of the steel billets entering the roughing mill group, the entry speed of some special steel billets entering the roughing mill group should not be lower than 0.12m/s, the excessively low entry speed can cause the surface of the roller to crack, the service life of the roller is reduced, the quality of finished products is influenced, the excessively low entry speed causes large temperature difference between the head and the tail of the rolled stock, the influence is caused on the quality and the dimensional tolerance of the products, the rolling speed in finished products of the finishing mill can be improved or reduced according to different steel types, the speed of the roughing mill group is not influenced, the rolling speed of some special steel cannot be too high, otherwise, the generated high deformation resistance can cause the core of the rolled stock to be overheated.
For the material tracking on the head-off roller way, the traditional continuous rolling tracking control can not meet the tracking of rolled pieces rolled at the head off and can not judge the position of a billet on the head-off roller way and the position of a steel tail at a middle rolling inlet in real time. Due to the fact that steel hanging or rough rolling steel tapping interval time of the head-off roller bed equipment is too short, after a previous rolled piece is bitten by a middle rolling machine frame, due to the fact that the middle rolling inlet speed is smaller than the rough rolling outlet speed, rear-end collision accidents are often caused, the tail portion of the previous rolled piece is seriously deformed and waste is cut, the next rolled piece flies out of the head-off roller bed and cannot be rolled continuously, the temperature is too low to be removed, and when the rear-end collision accidents occur, a certain time is needed to process waste billets so that the machine stops.
In the prior art, the outlet speed of a rough rolling area is manually controlled, an operator manually intervenes to reduce the speed by observing a monitoring video, the speed is manually increased after the distance is pulled, and the tapping interval time is manually reduced after the condition that the steel tapping interval time can cause rear-end collision is found. The prior art has the following defects:
due to the contingency of the steel hanging accident of the head-off roller way, the real condition of the head-off roller way in video monitoring can not be observed in time when an operator is on duty at night and tired, and the time is too late after the occurrence of rear-end collision is discovered.
When the difference between the speed of the medium rolling inlet and the speed of the rough rolling outlet is too large, the rear-end collision can be avoided only by increasing the time of tapping, thereby inevitably reducing the yield.
Disclosure of Invention
In view of the problems in the prior art, embodiments of the present invention provide a method and a system for controlling decapping rolling, which can at least partially solve the problems in the prior art.
In one aspect, the invention provides a method for controlling end-off rolling, which comprises the following steps:
acquiring the tail residual length of a rolled piece at a middle rolling inlet and the head length of the rolled piece at a rough rolling outlet;
calculating the distance between the head and the tail between two rolled pieces according to the distance between the racks, the residual length of the tail and the length of the head;
and if the distance between the head and the tail is smaller than a first preset distance threshold, the speed of the rough rolling unit is reduced to be slower than the speed of the middle rolling inlet in a cascade mode.
Wherein, the obtaining of the tail residual length of the rolled piece at the intermediate rolling inlet comprises the following steps:
when the rolled piece at the intermediate rolling inlet passes through the rough rolling outlet, determining the length of the rolled piece at the intermediate rolling inlet;
when a rolled piece at the middle rolling inlet is gripped by the middle rolling rack, determining the gripped head length of the rolled piece at the middle rolling inlet;
and taking the difference between the length of the rolled piece and the length of the head part of the rolled piece gripped at the intermediate rolling inlet as the tail residual length of the rolled piece at the intermediate rolling inlet.
Wherein, when the rolled piece passes through the rough rolling outlet at the intermediate rolling inlet, the length of the rolled piece at the intermediate rolling inlet is determined, and the method comprises the following steps:
and determining the length of the rolled piece at the intermediate rolling inlet when the steel biting signal at the rough rolling outlet falls.
Wherein, after the step of cascading the speed of the roughing mill group to be slower than the intermediate rolling entry speed, the method for controlling the rolling with the head removed further comprises the following steps:
and if the distance between the head and the tail is larger than or equal to a second preset distance threshold, the speed of the roughing mill set is increased to the speed before the speed is reduced in a cascading manner.
Wherein, after the step of cascading the speed of the roughing mill group to be slower than the intermediate rolling entry speed, the method for controlling the rolling with the head removed further comprises the following steps:
and if the distance between the head and the tail is greater than or equal to a second preset distance threshold value and the duration reaches a preset duration, the speed of the roughing mill set is increased to the speed before the reduction in speed in a cascading mode.
Wherein, after the step of cascading the speed of the roughing mill group to be slower than the intermediate rolling entry speed, the method for controlling the rolling with the head removed further comprises the following steps:
after steel is thrown at the rough rolling outlet, the speed of the rough rolling unit is increased to the speed before the reduction speed in a cascade mode.
Wherein, the end-off rolling control method further comprises:
and generating an alarm message while reducing the speed of the roughing mill group to be lower than the speed of the intermediate rolling inlet in a cascade manner.
In another aspect, the present invention provides a decapping rolling control system, comprising a main rolling PLC;
and the main rolling PLC executes the steps of the method.
In another aspect, an embodiment of the present invention provides an electronic device, including: a processor, a memory, and a bus, wherein,
the processor and the memory are communicated with each other through the bus;
the memory stores program instructions executable by the processor, the processor invoking the program instructions to perform a method comprising:
acquiring the tail residual length of a rolled piece at a middle rolling inlet and the head length of the rolled piece at a rough rolling outlet;
calculating the distance between the head and the tail between two rolled pieces according to the distance between the racks, the residual length of the tail and the length of the head;
and if the distance between the head and the tail is smaller than a first preset distance threshold, the speed of the roughing mill set is reduced to be slower than the speed of the middle rolling inlet in a cascade mode.
An embodiment of the present invention provides a non-transitory computer-readable storage medium, including:
the non-transitory computer readable storage medium stores computer instructions that cause the computer to perform a method comprising:
acquiring the tail residual length of a rolled piece at a middle rolling inlet and the head length of the rolled piece at a rough rolling outlet;
calculating the distance between the head and the tail between two rolled pieces according to the distance between the racks, the residual length of the tail and the length of the head;
and if the distance between the head and the tail is smaller than a first preset distance threshold, the speed of the rough rolling unit is reduced to be slower than the speed of the middle rolling inlet in a cascade mode.
According to the method and the system for controlling the end-off rolling, provided by the embodiment of the invention, the tail residual length of a rolled piece at a middle rolling inlet and the head length of the rolled piece at a rough rolling outlet are obtained; calculating the distance between the head and the tail between two rolled pieces according to the distance between the racks, the residual length of the tail and the length of the head; and if the distance between the head and the tail is smaller than a first preset distance threshold, the speed of the rough rolling unit is reduced to be slower than the speed of the middle rolling inlet in a cascade mode. The rear-end collision accident of the rolled piece can be avoided in the process of head-off rolling, the speed of the roughing mill set is reduced to be slower than that of the medium-rolling inlet in a cascade mode, the tapping time interval does not need to be increased, and the production efficiency can be improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts. In the drawings:
fig. 1 is a schematic flow chart of a method for controlling unheading rolling according to an embodiment of the present invention.
FIG. 2 is an explanatory diagram for calculating the distance between the head and the tail of two rolled pieces according to the embodiment of the invention.
Fig. 3 is a schematic diagram illustrating a decapping rolling control system according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
Fig. 1 is a schematic flow chart of a method for controlling end-piercing rolling according to an embodiment of the present invention, and as shown in fig. 1, the method for controlling end-piercing rolling according to an embodiment of the present invention includes:
step S1: and acquiring the tail residual length of the rolled piece at the intermediate rolling inlet and the head length of the rolled piece at the rough rolling outlet.
Step S2: and calculating the distance between the head and the tail between the two rolled pieces according to the distance between the frames, the residual length of the tail and the length of the head.
Step S3: and if the distance between the head and the tail is smaller than a first preset distance threshold, the speed of the rough rolling unit is reduced to be slower than the speed of the middle rolling inlet in a cascade mode.
In step S1, the apparatus obtains the tail stock remaining length at the mid-roll entrance and the head length of the product at the rough roll exit. The apparatus may comprise a computer device or PLC or the like performing the method. FIG. 2 is an illustrative schematic diagram of the calculation of the head to tail distance between two products in accordance with an embodiment of the present invention; as shown in fig. 2, the left side frame and the right side frame which are connected with each other at intervals are respectively a rough rolling frame and a middle rolling frame, the right side corresponding position of the rough rolling frame is a rough rolling outlet, and the left side corresponding position of the middle rolling frame is a middle rolling inlet.
The material tracked by the embodiment of the invention is a rolled piece which can be a pipeline material, a plate material and the like, and tests prove that the application effect of the pipeline material of the method of the embodiment of the invention is better than that of the plate material.
The rolled piece sequentially passes through the following processes from left to right:
the rolled piece passes through the rough rolling inlet first and is gripped by the rough rolling stand, and the head length (corresponding to the head tracking distance in fig. 2) of the rolled piece at the rough rolling outlet is obtained.
And when the tail part of the rolled piece is separated from the rough rolling stand (namely when the rolled piece integrally passes through the rough rolling outlet), determining the length of the rolled piece.
The rolled piece passes through the middle roll inlet and is gripped by the middle roll stand, and the gripped head length of the rolled piece (corresponding to the partial length of the rolled piece on the right side of the right side stand in fig. 2) is determined.
The difference between the length of the rolled piece and the length of the gripped head is taken as the tail residual length of the rolled piece (corresponding to the tail residual length trace in fig. 2).
When the whole rolled piece passes through the middle rolling outlet, the rolled piece passes through the whole process of head-off rolling.
Referring to FIG. 2, it will be appreciated that the product at the intermediate roll inlet and the product at the rough roll outlet are two distinct products, the product at the intermediate roll inlet being the first product and the product at the rough roll outlet being the second product.
Further, the acquiring of the tail residual length of the rolled piece at the intermediate rolling inlet comprises the following steps:
when a rolled piece at the middle rolling inlet passes through the rough rolling outlet, determining the length of the rolled piece at the middle rolling inlet; it should be noted that, referring to fig. 2, the rolled piece at the intermediate rolling inlet refers to a rolled piece at the intermediate rolling inlet at the present position, and when the rolled piece at the intermediate rolling inlet passes through the rough rolling outlet, it refers to when the rolled piece at the intermediate rolling inlet passes through the rough rolling outlet at the past time, the rolled piece at the intermediate rolling inlet is not the rolled piece at the rough rolling outlet in fig. 2.
When a rolled piece at a middle rolling inlet is gripped by a middle rolling frame, determining the length of the gripped head of the rolled piece at the middle rolling inlet; reference is made to the above description and no further description is made.
And taking the difference between the length of the rolled piece and the length of the head part of the rolled piece gripped at the intermediate rolling inlet as the tail residual length of the rolled piece at the intermediate rolling inlet. Reference is made to the above description and no further description is made.
Further, determining the length of the rolled piece at the intermediate rolling inlet when the rolled piece passes through the rough rolling outlet comprises:
and determining the length of the rolled piece at the intermediate rolling inlet when the steel biting signal at the rough rolling outlet falls.
The length of the rolled piece at the intermediate rolling inlet is determined when the steel biting signal falls, and the length of the rolled piece at the intermediate rolling inlet can be determined when the rolled piece just breaks away from the rough rolling frame, so that the length of the rolled piece at the intermediate rolling inlet is more accurate in calculation.
In step S2, the apparatus calculates the head-to-tail distance between the two products based on the inter-stand distance, the tail remaining length, and the head length. The distance between the frames is a fixed value which can be obtained in advance, and referring to fig. 2, the distance between the head and the tail of the two rolled pieces can be calculated by the following formula:
the distance between the head and the tail between the two rolled pieces is equal to the distance between the frames, the residual length of the tail and the length of the head.
In step S3, if it is determined that the distance between the head and the tail is smaller than the first preset distance threshold, the device cascades down the speed of the roughing mill to be slower than the speed of the intermediate rolling inlet. The first preset distance threshold value can be set independently according to actual conditions, and can be selected to be 4 meters.
It should be noted that, during deceleration, the speed of the head-off roller table needs to be changed in a cascading manner so as to avoid causing the grinding roller, that is, the speed of the roughing mill set is reduced in a cascading manner to be slower than the speed of the intermediate rolling inlet.
The preset percentage can be set independently according to actual conditions, and in order to ensure the production efficiency, the speed should be reduced slightly, so that the preset percentage can be selected to be 90%.
Further, after the step of cascading the speed of the roughing train to be slower than the intermediate rolling entry speed, the method for controlling the rolling with the strip end further comprises:
and if the distance between the head and the tail is larger than or equal to a second preset distance threshold, the speed of the roughing mill set is increased to the speed before the speed is reduced in a cascading manner. It can be understood that, since the speed of the roughing mill set is reduced in a cascade mode to be slower than the speed of the middle rolling inlet, the distance between the head and the tail is continuously increased, and therefore the second preset distance threshold is larger than the first preset distance threshold, and the second preset distance threshold can be set independently according to actual conditions and can be selected to be 6 meters.
When the distance between the head and the tail is greater than or equal to the second preset distance threshold, the speed of the roughing mill set is increased to the speed before the speed is reduced in a cascading mode, the rolling time interval of two rolled pieces can be shortened on the premise that the rolled pieces do not collide with the tail, and therefore the production efficiency in the process of rolling at the end of the strip can be improved.
Further, after the step of cascading the speed of the roughing train to be slower than the intermediate rolling entry speed, the method for controlling the rolling with the strip end further comprises:
and if the distance between the head and the tail is greater than or equal to a second preset distance threshold value and the duration reaches a preset duration, the speed of the roughing mill set is increased to the speed before the reduction in speed in a cascading mode. The preset duration can be set independently according to actual conditions.
When the distance between the head and the tail is larger than or equal to the second preset distance threshold value, and the duration reaches the preset duration, the speed of the roughing mill set is increased to the speed before the reduction speed in a cascading mode, so that the frequent speed switching can be avoided, and the stability of the control of the rolling process of the head-off rolling is improved.
Further, after the step of cascading the speed of the roughing train to be slower than the intermediate rolling entry speed, the method for controlling the rolling with the strip end further comprises:
after steel is thrown at the rough rolling outlet, the speed of the rough rolling unit is increased to the speed before the reduction speed in a cascade mode. The step is beneficial to quickly carrying out rough rolling on the next rolled piece, and further the production efficiency is improved.
Further, the decapping rolling control method further includes:
and generating an alarm message while cascading the speed of the rough mill group to be lower than the speed of the medium rolling inlet. The alarm message is generated to help inform relevant staff immediately, and further response countermeasures are taken.
The method for controlling the end-off rolling obtains the tail residual length of a rolled piece at a middle rolling inlet and the head length of the rolled piece at a rough rolling outlet; calculating the distance between the head and the tail between two rolled pieces according to the distance between the racks, the residual length of the tail and the length of the head; and if the distance between the head and the tail is smaller than a first preset distance threshold, the speed of the rough rolling unit is reduced to be slower than the speed of the middle rolling inlet in a cascade mode. The rear-end collision accident of the rolled piece can be avoided in the process of head-off rolling, the speed of the roughing mill set is reduced to be slower than that of the medium-rolling inlet in a cascade mode, the tapping time interval does not need to be increased, and the production efficiency can be improved.
The embodiment of the invention provides a head-off rolling control system, which comprises a main rolling PLC;
and the main rolling PLC executes the steps of the method. For the specific description of the method steps, reference may be made to the above embodiments, which are not repeated herein. Fig. 3 is a schematic diagram illustrating a rolling control system for removing ends according to an embodiment of the present invention, and as shown in fig. 3, the main subsystems of the rolling control system for removing ends are illustrated as follows:
main rolling PLC: and finishing data acquisition, rolling mill tracking and rolling mill speed control.
A human-computer interface: and displaying the tracking of the rolled piece, alarming distance, setting delay time and tapping rhythm.
A network system: including remote I/O network, transmission network, and ethernet TCP/IP, etc., and connects the subsystems for data interaction.
The transmission device comprises: and executing a speed command formed by the PLC to control the rolling mill equipment.
An on-site detection element: the main equipment is a rough rolling stand encoder and a middle rolling stand encoder, the actual speed of the rolling mill is collected and controlled by a PLC, and compared with a normal rolling line system, the automatic rolling line system does not need to be additionally provided with any new detection element.
It should be noted that the above-mentioned obtaining the head length of the rolled product at the rough rolling outlet may include:
the head length of the rolled piece at the rough rolling outlet is calculated through the speed feedback of the encoder of the rough rolling stand, and the specific calculation method is mature in the field and is not described any more.
The determining the length of the head of the rolled piece gripped at the intermediate roll inlet may include:
the length of the gripped head of the rolled piece at the intermediate rolling inlet is calculated through the speed feedback of the encoder of the intermediate rolling stand, and the specific calculation method is mature in the field and is not described any more. The head length of the rolled piece at the rough rolling outlet and the head length of the rolled piece gripped at the intermediate rolling inlet are calculated by the encoder, so that the position of the rolled piece can be accurately tracked.
The embodiments of the decapping rolling control system provided in the embodiments of the present invention may be specifically used for executing the processing flows of the above method embodiments, and the functions thereof are not described herein again, and reference may be made to the detailed description of the above method embodiments.
The end-off rolling control system provided by the embodiment of the invention obtains the tail residual length of a rolled piece at a middle rolling inlet and the head length of the rolled piece at a rough rolling outlet; calculating the distance between the head and the tail between two rolled pieces according to the distance between the racks, the residual length of the tail and the length of the head; and if the distance between the head and the tail is smaller than a first preset distance threshold, the speed of the roughing mill set is reduced to be slower than the speed of the middle rolling inlet in a cascade mode. The rear-end collision accident of the rolled piece can be avoided in the process of head-off rolling, the speed of the roughing mill set is reduced to be slower than that of the medium-rolling inlet in a cascade mode, the tapping time interval does not need to be increased, and the production efficiency can be improved.
Fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present invention, and as shown in fig. 4, the electronic device includes: a processor (processor)401, a memory (memory)402, and a bus 403;
the processor 401 and the memory 402 complete communication with each other through a bus 403;
the processor 401 is configured to call the program instructions in the memory 402 to execute the methods provided by the above-mentioned method embodiments, for example, including: acquiring the tail residual length of a rolled piece at a middle rolling inlet and the head length of the rolled piece at a rough rolling outlet; calculating the distance between the head and the tail between two rolled pieces according to the distance between the racks, the residual length of the tail and the length of the head; and if the distance between the head and the tail is smaller than a first preset distance threshold, the speed of the rough rolling unit is reduced to be slower than the speed of the middle rolling inlet in a cascade mode.
The present embodiment discloses a computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, enable the computer to perform the method provided by the above-mentioned method embodiments, for example, comprising: acquiring the tail residual length of a rolled piece at a middle rolling inlet and the head length of the rolled piece at a rough rolling outlet; calculating the distance between the head and the tail between two rolled pieces according to the distance between the racks, the residual length of the tail and the length of the head; and if the distance between the head and the tail is smaller than a first preset distance threshold, the speed of the rough rolling unit is reduced to be slower than the speed of the middle rolling inlet in a cascade mode.
The present embodiment provides a computer-readable storage medium, which stores a computer program, where the computer program causes the computer to execute the method provided by the above method embodiments, for example, the method includes: acquiring the tail residual length of a rolled piece at a middle rolling inlet and the head length of the rolled piece at a rough rolling outlet; calculating the distance between the head and the tail between two rolled pieces according to the distance between the racks, the residual length of the tail and the length of the head; and if the distance between the head and the tail is smaller than a first preset distance threshold, the speed of the rough rolling unit is reduced to be slower than the speed of the middle rolling inlet in a cascade mode.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In the description herein, reference to the description of the terms "one embodiment," "a particular embodiment," "some embodiments," "for example," "an example," "a particular example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A method for controlling unheading rolling, comprising:
acquiring the tail residual length of a rolled piece at a middle rolling inlet and the head length of the rolled piece at a rough rolling outlet;
calculating the distance between the head and the tail between two rolled pieces according to the distance between the racks, the residual length of the tail and the length of the head;
and if the distance between the head and the tail is smaller than a first preset distance threshold, the speed of the rough rolling unit is reduced to be slower than the speed of the middle rolling inlet in a cascade mode.
2. The method for controlling unheading rolling according to claim 1, wherein said obtaining a tail residual length of a product to be rolled at a mid-roll entry point comprises:
when the rolled piece at the intermediate rolling inlet passes through the rough rolling outlet, determining the length of the rolled piece at the intermediate rolling inlet;
when a rolled piece at a middle rolling inlet is gripped by a middle rolling frame, determining the length of the gripped head of the rolled piece at the middle rolling inlet;
and taking the difference between the length of the rolled piece and the length of the head part of the rolled piece gripped at the intermediate rolling inlet as the tail residual length of the rolled piece at the intermediate rolling inlet.
3. The method of claim 2 wherein determining the product length of the product at the intermediate roll entry as it passes through the rough roll exit comprises:
and determining the length of the rolled piece at the intermediate rolling inlet when the falling edge of the steel biting signal at the rough rolling outlet.
4. The unheading rolling control method according to claim 1, wherein said step of cascading the roughing train speed down to be slower than the intermediate mill entry speed is followed by said step of controlling the unheading rolling further comprising:
and if the distance between the head and the tail is larger than or equal to a second preset distance threshold, the speed of the roughing mill set is increased to the speed before the speed is reduced in a cascading manner.
5. The unheading rolling control method according to claim 1, wherein after said step of cascading roughing train speeds down to be slower than the intermediate roll entry speed, said unheading rolling control method further comprises:
and if the distance between the head and the tail is greater than or equal to a second preset distance threshold value and the duration reaches a preset duration, the speed of the roughing mill set is increased to the speed before the reduction in speed in a cascading mode.
6. The unheading rolling control method according to claim 1, wherein said step of cascading the roughing train speed down to be slower than the intermediate mill entry speed is followed by said step of controlling the unheading rolling further comprising:
after steel is thrown at the rough rolling outlet, the speed of the rough rolling unit is increased to the speed before the reduction speed in a cascade mode.
7. The unheading rolling control method according to claim 1, further comprising:
and generating an alarm message while cascading the speed of the rough mill group to be lower than the speed of the medium rolling inlet.
8. A head-off rolling control system is characterized by comprising a main rolling PLC;
the main rolling PLC performs the steps of the method according to any one of claims 1 to 7.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the steps of the method of any of claims 1 to 7 are implemented when the computer program is executed by the processor.
10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210309944.1A CN114700377B (en) | 2022-03-28 | 2022-03-28 | Method and system for controlling head-removing rolling |
Applications Claiming Priority (1)
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| US6449996B1 (en) * | 1998-03-19 | 2002-09-17 | Kawasaki Steel Corporation | Method of hot-rolling metal pieces |
| CN104971950A (en) * | 2014-04-10 | 2015-10-14 | 鞍钢股份有限公司 | Automatic deceleration control method of tandem cold mill |
| CN105834224A (en) * | 2015-01-12 | 2016-08-10 | 宝山钢铁股份有限公司 | Method for preventing cool roller bed of hot rolling layer from steel rear-end collision |
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