CN111215456A - Method for controlling threading stability of strip steel in hot-rolling laminar cooling area - Google Patents
Method for controlling threading stability of strip steel in hot-rolling laminar cooling area Download PDFInfo
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- CN111215456A CN111215456A CN201811413041.8A CN201811413041A CN111215456A CN 111215456 A CN111215456 A CN 111215456A CN 201811413041 A CN201811413041 A CN 201811413041A CN 111215456 A CN111215456 A CN 111215456A
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- cooling
- strip steel
- threading
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- laminar
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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
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B45/0233—Spray nozzles, Nozzle headers; Spray systems
Abstract
The invention relates to a method for controlling strip steel threading stability in a hot rolling laminar cooling area, which specifically comprises the following steps: (1) in the initial cooling section, the upper cooling header and the lower cooling header of each group of cooling headers are continuously and alternately opened up and down; (2) after entering a normal cooling area, the upper cooling collecting pipe and the lower cooling collecting pipe are symmetrically opened, the opening number is gradually increased, and gradual water spraying from sparse to dense is carried out; (3) and (4) delaying the opening control of a vertical water spraying device at the outlet of the laminar cooling area. The invention can ensure the smooth threading of the strip steel in the laminar cooling area, and solves the problem that the head of the strip steel cannot enter a coiler to cause the shutdown accident of the scrap steel because the head of the thinner and softer strip steel is difficult to smoothly complete the 'threading' action in the laminar cooling area sometimes, and the abnormal conditions of the head of the strip steel such as floating, folding and inserting into a roller way occur at present.
Description
Technical Field
The invention relates to the field of automatic control of a production process of hot-rolled strip steel, in particular to a method for controlling strip steel threading stability in a hot-rolled laminar cooling area.
Background
After the head of the strip steel is rolled by the finish rolling continuous rolling stand, the threading in a finish rolling area is finished (the strip steel smoothly passes through the finish rolling continuous rolling stand according to set process parameters), the head of the strip steel immediately enters a laminar cooling area, and the strip steel rapidly moves to a coiler which is dozens of meters or even one hundred meters away while being cooled by water sprayed from an upper cooling header and a lower cooling header by laminar cooling. From this moment on, until the head of the strip is successfully coiled on the coiler, it is the "threading" process of the strip in the laminar cooling zone.
In this process, the strip head encounters a large resistance due to the absence of the drag and the need to pass through the "water wall" formed by the water sprayed from the laminar cooling upper and lower cooling headers. For thinner and softer strip steel, the head of the strip steel is sometimes difficult to smoothly complete the strip threading action, abnormal conditions such as head floating, head folding, head inserting into a roller way and the like occur, and in severe cases, the head of the strip steel cannot enter a coiler to cause a scrap steel shutdown accident.
In order to solve the problems, the method widely adopted at present is to delay the acceleration action of the starting strip steel on the laminar cooling roller way and reduce the direct resistance when the head of the strip steel is contacted with a laminar cooling water wall. This method can achieve certain effects, but has limited adjustment means and influences the rolling capacity to some extent.
Disclosure of Invention
The invention aims to provide a method for controlling the threading stability of strip steel in a hot-rolling laminar cooling area, which can ensure the smooth and stable threading of the strip steel in the laminar cooling area and is used for solving the problem that the head of the strip steel cannot enter a coiler to cause the shutdown accident of scrap steel due to the abnormal conditions of head floating, folding, roller insertion and the like caused by the fact that the head of the strip steel is difficult to smoothly complete the threading action in the laminar cooling area for the thin and soft strip steel at present.
In order to achieve the purpose, the scheme of the invention is as follows: a method for controlling strip steel threading stability of a hot-rolling laminar cooling area divides the laminar cooling area into a plurality of cooling sections, each cooling section comprises a plurality of groups of cooling headers which are symmetrically arranged up and down, and the laminar cooling method specifically comprises the following steps:
(1) when the head of the strip steel is positioned in an initial cooling section of a laminar cooling area, an upper cooling header and a lower cooling header of the initial cooling section are continuously and alternately opened, and the number of the cooling headers of the initial cooling section is set according to actual needs;
(2) after the head of the strip steel passes through the initial cooling section, the upper cooling header and the lower cooling header of each cooling section are symmetrically opened along the running direction of the strip steel, the opening number is gradually increased, and the head of the strip steel is finally transited to be completely opened;
(3) when the head of the strip steel passes through a laminar cooling area and is about to enter a coiler, if the head of the strip steel runs for a set distance or runs for a set length, the vertical water spraying device is started;
(4) and finishing the laminar cooling control of the strip steel.
Further, according to the laminar flow cooling method of the present invention, in the step (1), the initial cooling section includes three sets of cooling headers symmetrically arranged up and down.
Further, according to the laminar flow cooling method of the present invention, the first group of cooling headers of the initial cooling section is not turned on, and the upper cooling headers and the lower cooling headers of the second group and the third group of cooling headers are continuously and alternately turned on.
Further, according to the laminar flow cooling method of the present invention, in the step (2), the number of the openings of the upper cooling header and the lower cooling header of each cooling section is increased by one or two at a time along the running direction of the strip steel, and the transition is gradually made to the full opening.
Further, according to the laminar cooling method, a threading control parameter table is established according to the hardness group, the thickness grade and the threading speed grade of the strip steel, when the strip steel is subjected to laminar cooling threading, the threading control parameter table is inquired according to the steel grade, the finished product thickness and the initial threading speed of the strip steel, whether threading stability control needs to be carried out on the strip steel is determined, if yes, the steps (1) to (4) are executed, and otherwise, a conventional control mode is adopted.
The invention achieves the following beneficial effects: the invention can well solve the problem of threading stability of thin and soft strip steel in a laminar cooling area under the condition of not delaying acceleration, and obtains good effect in the actual production of hot rolling.
Drawings
FIG. 1 is a schematic view of the water spray pattern of the initial cooling section;
FIG. 2 is a schematic view of a gradual water spray pattern after passing through an initial cooling section;
FIGS. 3 and 4 are schematic views of the delayed opening control of the vertical sprinkler;
fig. 5 is a flow chart of a method of the present invention.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples.
The laminar flow cooling area is divided into a plurality of cooling sections, each cooling section comprises a plurality of groups of cooling headers which are symmetrically arranged up and down, and the number of the cooling headers of each cooling section is set according to actual production conditions. In order to improve the threading stability of the strip steel in a laminar cooling area, the control of laminar cooling water is combined and optimized in three links, namely (1) asymmetrical water spraying is adopted in an initial cooling section; (2) the cooling section from the middle part to the tail part adopts gradual water spraying; (3) and the vertical water spraying device at the outlet of the laminar cooling area is started in a delayed mode. The number of cooling headers in the initial cooling section is set according to actual needs.
(1) Asymmetric water spray
As shown in figure 1, when the strip steel just enters a laminar flow cooling water spraying area, namely in an initial cooling section, the upper cooling header and the lower cooling header of each group of cooling headers are continuously and alternately opened up and down, because the upper cooling header and the lower cooling header are alternately opened, the head of the strip steel is alternately impacted upwards and downwards, so that a 'water wall' can be prevented from being formed when the upper cooling header and the lower cooling header of the initial cooling section are symmetrically opened, and the head of the strip steel is prevented from being impacted upwards or downwards in a unidirectional mode, so that the head of the strip steel is prevented from being bent upwards or downwards in a unidirectional mode. In fig. 1, BANK represents a laminar flow-cooled roll-over stand, and the upper and lower cooling headers of each roll-over stand form a cooling section, and the cooling headers are open in dotted lines and closed in solid lines.
(2) Gradual water spraying
As shown in figure 2, after the strip steel passes through the initial cooling section and enters the normal cooling area, symmetrical water spray cooling is carried out, the density of the water spray gradually changes from relatively sparse to relatively dense along the running direction of the strip steel (moving from finish rolling to coiling), and the resistance of the water wall formed by dense symmetrical opening of the cooling header pipe to strip steel threading can be reduced through gradual water spray.
(3) Vertical water spraying device for delaying starting of laminar cooling area outlet
The laminar flow cooling outlet is provided with a vertical water spraying device with high water pressure for blowing the residual cooling water on the surface of the strip steel, and in the prior art, the vertical water spraying device is generally opened in advance before the head of the strip steel reaches the vertical water spraying device. Because the water pressure of the vertical water spraying device is high, the head of the thinner and softer strip steel is difficult to pass through the water wall.
As shown in figures 3 and 4, when the head of the strip steel is cooled and is about to enter the coiler, the invention delays the opening of the vertical water spraying device, namely the vertical water spraying device is opened after the head of the strip steel passes through the vertical water spraying device for a set distance or a set time.
The invention specifically comprises the following steps:
(1) establishing a threading control parameter table, such as table one, according to the hardness of the strip steel, the target thickness of a finished product and the initial threading speed of a laminar cooling area;
watch 1
Wherein, for the selection setting of the delayed starting mode, the user sets the mode by himself according to the actual production situation on site, and when the head delay length is desired to be fixed, for example, when the head delay length is fixed to be 10 meters or 20 meters, the distance delay mode is selected; if the delay time is explicitly required, a time delay mode may be employed. The opening and closing state of the cooling header is also set by a user according to the actual production situation on site.
(2) Inquiring a hardness group division table (shown as a table II) according to the steel grade of incoming strip steel, and determining a strip steel hardness group; inquiring a band steel thickness grade division table (shown as table three) according to the target thickness of the incoming material finished product, and determining the thickness grade; inquiring a strip steel speed grade division table (such as a table IV) according to the initial strip threading speed of the strip steel laminar cooling area, and determining the strip steel speed grade;
watch two
| Steel grade | Hardness |
| Steel grade | |
| 1 | 1 |
| Steel grade 2 | 1 |
| ... | ... |
| Steel grade K | M |
| Steel grade M | N |
| ... | ... |
Watch III
| Finished product thickness rating | Finished product thickness value Range (mm) |
| 1 | 0＜T≤T1 |
| 2 | T1＜T≤T2 |
| 3 | T2＜T≤T3 |
| ... | ... |
| N | TN-1＜T |
Watch four
| Threading speed rating | Threading speed value range (m/s) |
| 1 | 0＜S≤S1 |
| 2 | S2＜S≤S3 |
| 3 | S3＜S≤S4 |
| ... | ... |
| M | SM-1＜S≤SM |
(3) According to the step (2), determining whether the band steel needs to be subjected to band-crossing stability control or not by inquiring a band steel band-crossing control parameter table, and if so, entering the step (4); if not, directly carrying out conventional control;
(4) asymmetric water spraying is adopted in an initial cooling section, namely: the upper cooling header and the lower cooling header of the cooling header are continuously and alternately opened up and down;
(5) when the head of the strip steel passes through the initial cooling section and enters a normal cooling area, symmetrical water spray cooling from sparse to dense is carried out, namely: symmetrically opening an upper cooling header and a lower cooling header of each group of cooling headers, and gradually changing the opening number of each group of cooling headers from sparse to dense along the running direction of the strip steel until the cooling headers are completely opened;
(6) when the head of the strip steel passes through a laminar cooling area and is about to enter a coiler, a delayed opening mode is adopted for a vertical water spraying device, namely: and when the head of the strip steel runs for a set distance or a set length beyond the vertical water spraying device, starting the vertical water spraying device.
The first embodiment is as follows:
assuming that a main cooling area of a certain production line is provided with 12 cooling sections, namely BANK 1-BANK 12, each cooling section comprises 6 cooling headers respectively arranged at the upper part and the lower part, the BANK 1-BANK 3 are set as initial cooling sections in the embodiment. The incoming material condition of the strip steel: steel grade: AP1056E 1; target thickness: 1.81 mm; threading speed: 11.6m/s, and according to the incoming material condition, the band steel needs to be subjected to band-threading stability control by inquiring a band-threading control parameter table. In this embodiment, 0 indicates that the cooling header is closed, and 1 indicates that the cooling header is open.
The threading control parameter table established in this embodiment is as follows:
wherein, the hardness groups are divided as follows:
| steel grade | |
| AP1056E1 | |
| 1 | |
| |
1 |
| ... | ... |
The thickness grades are divided as follows:
| finished product thickness rating | Finished product thickness value Range (mm) |
| 1 | 0＜T≤1.5 |
| 2 | 1.5＜T≤1.7 |
| 3 | 1.7＜T≤2.0 |
| 4 | 2.0＜T≤2.5 |
| 5 | 2.5＜T≤3.0 |
| 6 | 3.0＜T≤4.0 |
| 7 | 4.0＜T |
The threading speed is graded as follows:
| threading speed rating | Threading speed value range (m/s) |
| 1 | 0＜S≤7.0 |
| 2 | 7.0＜S≤8.0 |
| 3 | 8.0＜S≤9.0 |
| 4 | 9.0＜S≤10.0 |
| 5 | 10.0＜S≤11.0 |
| 6 | 11.0＜S≤12.0 |
The specific control process of this embodiment is as follows:
(1) in the initial cooling section, the BANK1 is not opened, and the BANK 2-BANK 3 are opened in a sparse way in an up-and-down asymmetrical mode.
The states of the upper cooling headers of BANK 1-BANK 3 were controlled as follows: BANK 1: 000000, BANK 2: 101010, BANK 3: 101010.
the states of the lower cooling headers of BANK 1-BANK 3 were controlled as follows: BANK 1: 000000, BANK 2: 101010, BANK 3: 101010.
(2) the middle part to the tail part cooling section sprays water symmetrically from top to bottom, and gradually transits from sparse to dense:
the control of BANK 4-BANK 5 is sparsely symmetrical water spray, and the first cooling header is not opened, namely: the states of the upper cooling header and the lower cooling header of BANK 4-5 are 010101;
BANK 6-BANK 7 is added with a cooling header for spraying water on the basis of BANK 4-BANK 5, and the first cooling header is not opened, namely: the states of the upper cooling header and the lower cooling header of BANK 6-BANK 7 are as follows: 011011, respectively;
the BANK 8-BANK 9 is characterized in that a cooling header is added to spray water on the basis of BANK 6-BANK 7, and the first cooling header is not opened, namely: the states of the upper cooling header and the lower cooling header of BANK 8-BANK 9 are as follows: 011111;
the cooling headers of BANK 10-BANK 12 are all opened, and water is continuously sprayed, namely the states of the upper cooling header and the lower cooling header of BANK 10-BANK 12 are 111111.
(3) By inquiring the threading control parameter table, the delayed start adopts the delayed fixed time to start the outlet vertical water spraying device, and the delay time set by the embodiment is 2000 ms.
Example two:
assuming that a main cooling area of a certain production line is provided with 12 cooling sections, namely BANK 1-BANK 12, each cooling section comprises 6 cooling headers respectively arranged at the upper part and the lower part, the BANK 1-BANK 3 are set as initial cooling sections in the embodiment. The incoming material condition of the strip steel: steel grade: AQ1060H 5; target thickness: 2.21 mm; threading speed: 10.8m/s, and according to the incoming material condition, the band steel needs to be subjected to band-threading stability control by inquiring a band-threading control parameter table. In this embodiment, 0 indicates that the cooling header is closed, and 1 indicates that the cooling header is open. The specific control process is as follows:
(1) in the initial cooling section, the BANK1 is not opened, and the BANK 2-BANK 3 are opened in a sparse way in an up-and-down asymmetrical mode.
The states of the upper cooling headers of BANK 1-BANK 3 were controlled as follows: BANK 1: 000000, BANK 2: 101010, BANK 3: 101010.
the states of the lower cooling headers of BANK 1-BANK 3 were controlled as follows: BANK 1: 000000, BANK 2: 101010, BANK 3: 101010.
(2) the middle part to the tail part cooling section sprays water symmetrically from top to bottom, and gradually transits from sparse to dense:
the control of BANK 4-BANK 5 is sparsely symmetrical water spray, and the first cooling header is not opened, namely: the states of the upper cooling header and the lower cooling header of BANK 4-5 are 010101;
BANK 6-BANK 7 is added with a cooling header for spraying water on the basis of BANK 4-BANK 5, and the first cooling header is not opened, namely: the states of the upper cooling header and the lower cooling header of BANK 6-BANK 7 are as follows: 011011, respectively;
the BANK 8-BANK 9 is characterized in that a cooling header is added to spray water on the basis of BANK 6-BANK 7, and the first cooling header is not opened, namely: the states of the upper cooling header and the lower cooling header of BANK 8-BANK 9 are as follows: 011111;
the cooling headers of BANK 10-BANK 12 are all opened, and water is continuously sprayed, namely the states of the upper cooling header and the lower cooling header of BANK 10-BANK 12 are 111111.
(3) Through inquiring about the threading control parameter table, the delay starting adopts the delay to set the distance and then opens the perpendicular water jet equipment of export, and the delay distance that this embodiment set for is 10000 mm.
The method can particularly control the spraying process of the cooling water at the head of the strip steel in the hot rolling laminar cooling process, improve the running stability of the head of the strip steel when passing through a laminar cooling water wall, and particularly has very remarkable effect on improving the threading stability of thin and soft strip steel.
The invention can be used in all laminar cooling processes of a hot rolling production line, can greatly eliminate the conditions of flying, folding, inserting into a roller way and the like of the head of the strip steel, effectively reduces the risk of scrap steel, can generate higher economic benefit and has great popularization value.
Claims (4)
1. A method for controlling strip threading stability of a hot-rolled laminar cooling area comprises the steps of dividing the laminar cooling area into a plurality of cooling sections, wherein each cooling section comprises a plurality of groups of cooling headers which are symmetrically arranged up and down, and the method is characterized in that:
the method for the threading stability of the strip steel specifically comprises the following steps:
(1) when the head of the strip steel is positioned in an initial cooling section of a laminar cooling area, an upper cooling header and a lower cooling header of the initial cooling section are continuously and alternately opened, and the number of the cooling headers of the initial cooling section is set according to actual needs;
(2) after the head of the strip steel passes through the initial cooling section, the upper cooling header and the lower cooling header of each cooling section are symmetrically opened along the running direction of the strip steel, the opening number is gradually increased, and the head of the strip steel is finally transited to be completely opened;
(3) when the head of the strip steel passes through a laminar cooling area and is about to enter a coiler, if the head of the strip steel runs for a set distance or runs for a set length, the vertical water spraying device is started;
(4) and finishing the laminar cooling control of the strip steel.
2. The method for controlling threading stability of a hot rolled laminar flow cooled zone strip steel according to claim 1, wherein in the step (1), the cooling header of the initial cooling section is divided into three cooling sections, the cooling header of the first cooling section is not opened, and the upper cooling header and the lower cooling header of the cooling headers of the second cooling section and the third cooling section are continuously and alternately opened.
3. The method for controlling the threading stability of the strip steel in the hot rolled laminar flow cooling zone as claimed in claim 1, wherein in the step (2), the number of the openings of the upper cooling header and the lower cooling header of each cooling section is increased by one or two at a time along the running direction of the strip steel, and the transition is gradually carried out to the full opening.
4. The method for controlling the threading stability of a strip steel in a hot rolling laminar cooling area according to claim 1, wherein a threading control parameter table is established according to the hardness group, the thickness grade and the threading speed grade of the strip steel, when the strip steel is threaded in the laminar cooling mode, the threading control parameter table is inquired according to the steel grade, the finished product thickness and the initial threading speed of the strip steel, whether the threading stability control of the strip steel is needed or not is determined, if so, the steps (1) to (4) are executed, otherwise, a conventional control mode is adopted.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114054515A (en) * | 2021-06-18 | 2022-02-18 | 德龙钢铁有限公司 | Method for controlling cold rolling base material iron scale after rolling |
| CN114289529A (en) * | 2021-12-14 | 2022-04-08 | 张家港宏昌钢板有限公司 | Header opening method under controlled cooling after rolling |
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| CN114054515A (en) * | 2021-06-18 | 2022-02-18 | 德龙钢铁有限公司 | Method for controlling cold rolling base material iron scale after rolling |
| CN114054515B (en) * | 2021-06-18 | 2024-02-27 | 德龙钢铁有限公司 | Method for controlling scale of cold rolling base stock after rolling |
| CN114289529A (en) * | 2021-12-14 | 2022-04-08 | 张家港宏昌钢板有限公司 | Header opening method under controlled cooling after rolling |
| CN114289529B (en) * | 2021-12-14 | 2023-06-20 | 张家港宏昌钢板有限公司 | Header opening method under controlled cooling after rolling |
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