CN115193927A - Control method for short stroke of front guide of finishing mill - Google Patents
Control method for short stroke of front guide of finishing mill Download PDFInfo
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- CN115193927A CN115193927A CN202210760884.5A CN202210760884A CN115193927A CN 115193927 A CN115193927 A CN 115193927A CN 202210760884 A CN202210760884 A CN 202210760884A CN 115193927 A CN115193927 A CN 115193927A
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- guide
- opening degree
- head
- short stroke
- previous frame
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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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- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Metal Rolling (AREA)
Abstract
The invention discloses a control method for a front guide short stroke of a finishing mill, which comprises the following steps: calculating the rolling length of the head of the strip steel on the previous frame in real time after the previous frame bites the steel; when the rolling length of the head of the strip steel on the previous frame reaches the effective control range length of the guide equipment in front of the frame, the guide opening degree in front of the frame is controlled from the set opening degree to the head short-stroke opening degree SG h (ii) a After the machine frame bites steel, the opening degree of the guide is controlled to be SG h Execute to the short stroke opening SG of the body b (ii) a After the former frame throws steel, the opening degree of the guide is controlled to be SG b And executing to the tail part short stroke opening degree. The invention is beneficial to improving the strip threading stability of the head of the strip steel, reduces the deviation of the central line of the strip steel at the outlet of the finish rolling, and has certain positive significance for optimizing the coiling type of the strip steel.
Description
Technical Field
The invention relates to the technical field of metallurgy automatic control, in particular to a control method for a front guide short stroke of a finishing mill.
Background
In the field of metal rolling, the front part of a rolling mill is generally designed with a guide and guard device which can be opened on two sides, or centered, or asymmetrically controlled, so as to ensure that rolling materials enter the rolling mill for rolling with a relative centering effect in the metal rolling process, but for various reasons, such as: the deviation of the supplied materials and the deviation of the rolling cause that the strip material gradually deviates from the rolling central line in the process of continuously rolling to be thin, so that the instability of strip threading in a finishing mill is caused, and the situations that the strip material rolled out by the finishing mill deviates from the central line more, so that the subsequent coiling coil shape is poor are caused.
At present, the following technologies are available for designing and controlling the guide and guard device: 1. the patent application No. CN205436627A proposes an on-line hot rolling strip steel finish rolling inlet side guide and guard device, which focuses on the improvement of a guide and guard mechanical structure, thereby reducing the labor intensity of personnel maintenance. 2. The patent application with application number CN204276532A provides a guide device capable of automatically adjusting the distance between guide plates, and a rolled piece width detection device is arranged on a rack, so that the function of automatically adjusting the distance between the guide plates is realized. 3. The patent application No. CN113042547A provides a strip steel guiding method and a side guide plate, and discloses a method for correcting the short stroke opening of a front side guide plate of a coiler according to the central line deviation and the width deviation of strip steel at the outlet of a finishing mill.
In summary, a control method for short stroke of the front guide opening degree of the finishing mill is absent in the field of metal rolling at present, and the prior art cannot judge the time for starting each guide opening degree in real time according to actual rolling data, so that accurate control of the front guide of the finishing mill cannot be realized, and the effect of better centering rolling of the finishing mill cannot be achieved.
Disclosure of Invention
The invention provides a control method for the short stroke of a front guide of a finishing mill, which is used for judging the time for starting the opening degree of each guide in real time according to actual rolling data, thereby realizing the accurate control of the front guide of the finishing mill and further achieving the effect of better centering rolling of the finishing mill.
In order to solve the technical problems, the invention provides the following technical scheme:
a control method for the short stroke of a front guide of a finishing mill comprises the following steps:
calculating the rolling length of the head of the strip steel on the previous frame in real time after the previous frame bites the steel;
when the rolling length of the head of the strip steel in the previous frame reaches the effective control range length of the guide equipment in the front of the frame, the guide opening degree in the front of the frame is controlled from the set opening degree to the head short-stroke opening degree SG h ；
After the machine frame bites steel, the opening degree of the guide and guard is controlled to be SG h Is executed to the short stroke opening SG of the body b ；
After the former frame throws steel, the opening degree of the guide is controlled to be SG b And executing to the tail short-stroke opening degree.
Further, after the previous frame bites steel, calculating the rolled length of the head of the strip steel in the previous frame in real time, and the method comprises the following steps:
and after the previous frame bites steel, calculating the rolling length of the head of the strip steel in the previous frame in real time according to the actual linear speed and the forward slip coefficient of the roller of the previous frame.
Further, the calculation formula of the rolling length of the strip steel head on the previous frame is as follows:
S h ＝V f ×(1+f)×t
wherein S is h Indicating the rolled length of the strip head in the preceding stand, V f The actual linear speed of the roller of the previous frame is shown, f is the forward slip coefficient of the previous frame, and t is the rolling time after the previous frame bites steel.
Furthermore, the rolling length of the strip steel head on the previous frame is the distance from the strip steel head to the central line of the roller of the previous frame.
Further, the length of the effective control range of the guide and guard equipment is the distance from the guide and guard equipment to the central line of the roller of the previous machine frame.
Further, it is characterized byThe head short-stroke opening SG h And correspondingly adjusting according to actual production requirements.
Further, the body has a short stroke opening SG b And correspondingly adjusting according to actual production requirements.
Furthermore, the tail short-stroke opening degree is correspondingly adjusted according to actual production requirements.
The technical scheme provided by the invention has the beneficial effects that at least:
the method for controlling the short stroke of the front guide of the finishing mill provided by the invention judges when the short stroke of the front guide head of the stand of the finishing mill is started by calculating the position of the head of the strip steel rolled by the previous stand between the stands in real time, thereby quickly centering the metal incoming material of the finishing mill and ensuring that the deviation of the central line of the strip steel rolled by the finishing mill is smaller. The control method is simple and easy to implement, can effectively ensure the threading stability in the rolling process of the finishing mill, enables the center line deviation of the strip rolled by finish rolling to be small, and has certain positive significance for good coil shape of the subsequent coiling head.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart illustrating an implementation of a method for controlling a short stroke of a front guide of a finishing mill according to an embodiment of the present invention;
fig. 2 is a control schematic diagram of a control method for a short stroke of a front guide of a finishing mill provided by an embodiment of the invention.
Description of reference numerals:
100. a metal plate; 101. rolling a central line; 102. the central line of the roller of the former frame;
11. a former frame supporting roller; 12. a former frame work roll;
21. a supporting roller of the machine frame; 22. this frame work roll.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
In the present embodiment, a control principle of the method is shown in fig. 2, in the metal rolling process, a metal plate 100 passes through a previous frame supporting roller 11 and a previous frame working roller 12 along a rolling center line 101, and a length S of a head of the metal plate 100 passing through a roll center line 102 of the previous frame is calculated in real time h Wait for S h The length S of the effective control range of the guide of the machine frame is reached a At the same time, the guide opening degree is adjusted from the set opening degree SG s Opening SG of short stroke of head h When the metal sheet 100 passes through the support roller 21 and the working roller 22, the guide opening degree is adjusted from the head opening degree SG h Is executed to the short stroke opening SG of the body b When the tail of the metal sheet 100 leaves the front frame supporting roller 11 and the front frame working roller 12, the guide opening degree is adjusted from the short stroke opening degree SG of the body b Execute to the tail short stroke opening SG t 。
Specifically, the execution flow of the method is shown in fig. 1, and includes the following steps:
s1, after each frame guide of finish rolling catches steel in the previous frame, calculating the rolling length S of the head of the strip steel in the previous frame in real time according to the actual linear speed and the forward slip coefficient of the roller of the previous frame h The formula is as follows:
S h ＝V f ×(1+f)×t
wherein, V f The actual linear speed of a frame roller before guide and guard in the rolling process is in the unit of m/s; f is the forward slip coefficient of the previous frame and is used for calculating the running speed V of the strip steel rolled by the previous frame f And f is the data set by the rolling process control system according to the current rolling condition, t is the rolling time after the previous frame bites steel, and the unit is s.
S2, when S h The length S of the effective control range of the front guide and guard equipment of the machine frame is reached a When it is started, the guideThe short stroke of the guard head makes the opening degree of the guide in front of the machine frame be from the set opening degree SG s Short stroke opening SG of head h ；
Wherein S is a The length from the central line of the roller of the previous machine frame to the effective control range of the guide of the machine frame is m, SG s Preset setting opening, SG, for the frame guides h The opening degree to be controlled for starting the short stroke of the head is mm, wherein SG h Can be correspondingly adjusted according to actual production requirements.
S3, after the frame bites steel, starting the short stroke of the guide body, and controlling the opening degree of the guide from SG h Execute to the short stroke opening SG of the body b ；
Wherein, SG b The opening degree required to be controlled for starting the short stroke of the body is mm, SG b Can be correspondingly adjusted according to actual production requirements.
S4, after the former frame throws steel, starting the short stroke of the tail part of the guide and guard, and controlling the opening degree of the guide and guard to be SG b Execute to the tail short stroke opening SG t ；
Wherein, SG t Opening degree required to be controlled for starting short stroke of tail part, and unit is mm, SG t Can be correspondingly adjusted according to the actual production requirement.
The following describes the implementation of the method of the present invention with reference to specific application examples.
In the application example, the number of the finish rolling stands is 8, the stand is a No. 2 stand, and the former stand is a No. 1 stand, and the operation is performed according to the following steps:
(1) When the No. 1 stand bites steel in finish rolling, according to the real-time linear speed of a No. 1 stand roller of 1.13m/S, the forward slip coefficient f is set to be 0.08, the head speed of the strip steel rolled by the No. 1 rolling mill is calculated to be 1.2204m/S, and the length S of the strip steel rolled by the No. 1 rolling mill is obtained at the moment h ＝1.2204×t；
(2) No. 2 rolling mill guide effective control range length S a Assuming 4.9m, when the No. 1 rolling mill rolls the strip steel with the length S h Equal to the length S of the effective control range of the No. 2 rolling mill guide a When it is usedInterval is t = S a Div 1.2204, calculating t =4.015, at this time, when the No. 1 rolling mill bites steel for 4.015s, the No. 2 rolling mill front guard opening degree is implemented from the set opening degree of 1575mm to the head short stroke opening degree of 1525mm;
(3) After the No. 2 rolling mill bites steel, the opening degree of a front guide guard of the No. 2 rolling mill is executed from the opening degree of the head to 1525mm to the opening degree of the body with a short stroke of 1550mm;
(4) After the No. 1 rolling mill throws steel, the opening degree of the front guard of the No. 2 rolling mill is executed from the opening degree of the body of 1550mm to the opening degree of the tail short stroke of 1535mm.
The application example can find that the control method for the short stroke of the front guide of the finishing mill can realize the accurate control of the front guide of the finishing mill in actual production, thereby achieving the effect of better centering rolling of the finishing mill.
In summary, the control method of this embodiment calculates the real-time position of the head of the strip steel entering the rack according to the steel biting signal of the previous rack of the guide, the linear velocity of the roller, and the forward slip coefficient, when the head of the strip steel enters the guide range, the guide is rapidly closed to the head short stroke position, so that the strip steel enters the rack in a centering manner, after the head of the strip steel enters the guide range, the guide is rapidly opened to the body short stroke position, the strip steel is kept unchanged in the rolling process, and until the previous rack throws the strip steel, the guide is adjusted to the tail short stroke position according to the control requirement. The method is favorable for improving the threading stability of the head of the strip steel, reduces the deviation of the central line of the strip steel at the finish rolling outlet, and has certain positive significance for optimizing the coiling type of the strip steel.
Furthermore, it should be noted that the present invention may be provided as a method, apparatus or computer program product. Accordingly, embodiments of 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, embodiments of the present invention may take the form of a computer program product embodied on one or more computer-usable storage media having computer-usable program code embodied in the media.
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 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, embedded processor, or other programmable data processing terminal to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal, 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 terminal to cause a series of operational steps to be performed on the computer or other programmable terminal to produce a computer implemented process such that the instructions which execute on the computer or other programmable terminal provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It should also be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrases "comprising one of 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a process, method, article, or terminal device that comprises the element.
Finally, it should be noted that while the above describes a preferred embodiment of the invention, it will be appreciated by those skilled in the art that, once the basic inventive concepts have been learned, numerous changes and modifications may be made without departing from the principles of the invention, which shall be deemed to be within the scope of the invention. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all changes and modifications that fall within the true scope of the embodiments of the present invention.
Claims (8)
1. A control method for the short stroke of a front guide of a finishing mill is characterized by comprising the following steps:
calculating the rolling length of the head of the strip steel on the previous frame in real time after the previous frame bites the steel;
when the rolling length of the head of the strip steel in the previous frame reaches the effective control range length of the guide equipment in the front of the frame, the guide opening degree in the front of the frame is controlled from the set opening degree to the head short-stroke opening degree SG h ；
After the machine frame bites steel, the opening degree of the guide and guard is controlled to be SG h Execute to the short stroke opening SG of the body b ；
After the former frame throws steel, the opening degree of the guide is controlled to be SG b And executing to the tail short-stroke opening degree.
2. The method for controlling the short stroke of the front guide of the finishing mill as claimed in claim 1, wherein the step of calculating the rolling length of the head of the strip steel in the previous frame in real time after the previous frame bites steel comprises the steps of:
and after the previous frame bites steel, calculating the rolling length of the head of the strip steel in the previous frame in real time according to the actual linear speed and the forward slip coefficient of the roller of the previous frame.
3. The method for controlling the short stroke of the front guide of the finishing mill as claimed in claim 2, wherein the calculation formula of the rolling length of the head of the strip steel in the previous frame is as follows:
S h ＝V f ×(1+f)×t
wherein S is h Indicating the rolled length of the strip head in the preceding stand, V f The actual linear speed of the roller of the previous frame is shown, f is the forward slip coefficient of the previous frame, and t is the rolling time after the previous frame bites steel.
4. The finishing mill forerunner short stroke control method of claim 1, wherein the length of the strip head rolled in the preceding stand is the distance from the strip head to the center line of the rolls of the preceding stand.
5. The method as claimed in claim 1, wherein the length of the effective control range of the guide and guard device is the distance from the guide and guard device to the center line of the roll of the previous stand.
6. The method of controlling the short stroke of the front guide of the finishing mill according to claim 1, wherein the head short stroke opening degree SG is set to h And correspondingly adjusting according to actual production requirements.
7. The method of claim 1, wherein the body short stroke opening degree SG is set to be equal to or greater than the body short stroke opening degree SG b And correspondingly adjusting according to actual production requirements.
8. The finishing mill forward guide short stroke control method as claimed in claim 1, wherein the tail short stroke opening degree is adjusted accordingly according to actual production requirements.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210760884.5A CN115193927A (en) | 2022-06-30 | 2022-06-30 | Control method for short stroke of front guide of finishing mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210760884.5A CN115193927A (en) | 2022-06-30 | 2022-06-30 | Control method for short stroke of front guide of finishing mill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115193927A true CN115193927A (en) | 2022-10-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210760884.5A Pending CN115193927A (en) | 2022-06-30 | 2022-06-30 | Control method for short stroke of front guide of finishing mill |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115193927A (en) |
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2022
- 2022-06-30 CN CN202210760884.5A patent/CN115193927A/en active Pending
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