CN112588834B - Loop control method for preventing hot rolling air from passing through rack to scratch strip steel head and tail - Google Patents
Loop control method for preventing hot rolling air from passing through rack to scratch strip steel head and tail Download PDFInfo
- Publication number
- CN112588834B CN112588834B CN202011306262.2A CN202011306262A CN112588834B CN 112588834 B CN112588834 B CN 112588834B CN 202011306262 A CN202011306262 A CN 202011306262A CN 112588834 B CN112588834 B CN 112588834B
- Authority
- CN
- China
- Prior art keywords
- loop
- rack
- frame
- steel
- passing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B41/00—Guiding, conveying, or accumulating easily-flexible work, e.g. wire, sheet metal bands, in loops or curves; Loop lifters
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Metal Rolling (AREA)
Abstract
The invention provides a loop control method for preventing a hot-rolled blank from passing through a rack to scratch the head and the tail of a strip steel, and belongs to the technical field of automatic control of metallurgy. The method controls the dynamic change of the shape of the strip steel during head threading and tail throwing by adjusting the loop waiting position angles and the change time of the waiting position angles at the inlet and the outlet of the hot finishing mill group when the hot finishing mill passes through the rack. The method can overcome the defects of head and tail scratches of the strip steel caused when the strip steel is rolled by the hollow frame of the existing hot rolling line, and has certain positive significance for reducing the surface quality defects caused by the strip steel rolled by the hollow frame of the hot finishing mill group and improving the product percent of pass.
Description
Technical Field
The invention relates to the technical field of metallurgy automatic control, in particular to a loop control method for preventing a hot-rolled blank from passing through a rack to scratch the head and the tail of strip steel.
Background
In a hot rolling site, it is often necessary to empty a certain finishing mill stand for production due to some cases such as a transmission failure, a reduction failure, or a small load. When rolling strip steel, the requirements on the surface quality of the strip steel are often strict. In the production process, the quality control of the surface of the strip steel is also fine. However, when the finish rolling passes through the empty rack, the strip steel is scratched with the front and rear transition guard plates when the strip steel passes through the empty rack, so that the head and the tail of the finished strip steel are easily scratched, and the yield of the finished product is reduced.
At present, the loop control method for preventing the head and the tail of strip steel from being scratched when an empty stand passes through a domestic hot rolling line has less introduction and description. The invention discloses a method for preventing surface scratches of a strip steel when the strip steel passes through a finishing mill (patent number CNIO3170507A), and provides a method for adjusting a roll gap of a rolling mill, recalibrating a loop angle, changing an internal mechanical structure of the rolling mill and adjusting a production process to prevent the surface scratches of the whole length of the strip steel.
Disclosure of Invention
The invention aims to provide a loop control method for preventing the head and the tail of strip steel from being scratched when a hot rolling air passes through a rack.
The method comprises the steps of firstly, controlling dynamic change of the head of the strip steel in the threading process by adjusting the angle of a loop waiting position at the entrance of an empty stand of a finishing mill group and the change time of the angle of the loop waiting position in the hot rolling process, and then controlling dynamic change of the tail of the strip steel in the steel throwing process by adjusting the angle of the loop waiting position at the exit of the empty stand and the change time of the angle of the loop waiting position.
The method specifically comprises the following steps:
(1) according to the distance D from the loop base at the entrance of the air passing rack to the front rack of the air passing rack X1 Length L of force arm of loop at entrance P And calculating the initial waiting position angle c of the loop at the inlet to obtain the rolling length L of the rack before the empty rack;
(2) according to the linear speed V of the roller passing through the front frame of the frame R Calculating the length L of the strip steel rolled out in real time by the front frame of the empty frame to reach the length L calculated in the step (1) according to the forward slip value f;
(3) according to the time t obtained by the calculation in the step (2), controlling the loop angle at the inlet of the empty rack from the initial waiting position angle c to the steel-passing waiting position angle d, and after the rack bites steel after the empty rack passes through, controlling the loop angle at the inlet of the empty rack to the normal steel rolling working angle h;
(4) and after a steel throwing signal is generated according to the front frame of the empty frame, controlling the loop at the inlet of the empty frame to recover to a steel feeding waiting position angle c from a steel rolling working angle h, and controlling the loop at the outlet of the empty frame to start to a steel throwing waiting position angle g from the steel feeding waiting position c.
Wherein, the calculation formula of the rolling length L of the hollow front frame passing through the frame in the step (1) is as follows:
L＝L P ×cosc+D X1 +ΔX，
wherein L is P The length of the force arm of the loop is in mm; c is a radical ofThe initial waiting position angle of the loop at the opening is in degrees; d X1 The distance from the looping base to the front frame of the vacant rack is from the entrance of the vacant rack, and the unit is mm; and delta X is the calculated rolled length compensation quantity of the front frame of the empty frame, and the unit is mm.
And calculating a rolled length compensation quantity delta X of the frame before the frame passes through the air, wherein the rolled length compensation quantity delta X is used for compensating the error of the calculated value of the rolled strip steel length caused by the calibration error of the angle of the loop, and the value range is the range of [ -a, a ], wherein a is 0-100.
The calculation formula of the time t for the length L of the strip steel rolled out in real time by the hollow front frame in the step (2) to reach the calculated length L in the step (1) is as follows:
l＝V R ×(1+f)×t，
wherein, V R The linear speed of the roller of the front frame of the empty frame is in mm/s, f is a forward slip value, t is the time required by the length L of the strip steel rolled by the front frame of the empty frame to reach the rolling length L of the front frame of the empty frame, and the unit is s.
And (3) looping through a steel waiting position angle d at the entrance of the hollow rack, wherein the steel waiting position angle d is used for preventing the head of the strip steel from being scratched by a front-back transition guard plate of the head of the strip steel and the empty rack due to the fact that tension cannot be built with the empty rack when the head of the strip steel passes through the loop at the entrance of the hollow rack, and the value range is an interval [0, b ], wherein b is 0-5 in unit.
And (4) casting a steel waiting position angle g through a loop at the outlet of the hollow frame, wherein the steel waiting position angle g is used for preventing the loop from falling off the loop at the inlet of the hollow frame when the tail of the strip steel is cast out of the front frame of the hollow frame, so that the tail of the strip steel loses tension to scratch the transition guard plate passing through the front and the rear of the hollow frame, and the value range is the interval [0, e ], wherein the value of e is 0-5.
The technical scheme of the invention has the following beneficial effects:
according to the scheme, the scratch of the head and the tail of the strip steel can be effectively prevented when the hot rolled strip passes through the rack for rolling, the method is simple and easy to implement, and the problem of the scratch of the transition protection plates of the head and the tail of the strip steel passing through the inlet and the outlet of the rack in the empty rolling process can be effectively solved only by adjusting the loop angle variable quantity and the change time of the inlet and the outlet of the rack in the rolling process.
Drawings
FIG. 1 is a schematic view of a front frame of a rolling mill with steel entering an empty frame;
FIG. 2 is a schematic view of a loop of a strip steel passing through an entrance of an empty stand in the rolling process of the present invention;
FIG. 3 is a schematic view of a stand after a strip steel passes through an empty stand in the rolling process of the present invention;
FIG. 4 is a schematic view of a front stand of the present invention before strip steel is thrown out of the stand during rolling.
Wherein: 21-strip steel.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
The invention provides a loop control method for preventing a hot-rolled blank from passing through a rack to scratch the head and the tail of strip steel.
The method comprises the steps of firstly controlling dynamic change of the head of the strip steel in the threading process by adjusting the angle of the loop waiting position at the inlet of the idle stand of the finishing mill group and the change time of the angle of the loop waiting position in the hot rolling process, and then controlling dynamic change of the tail of the strip steel in the steel throwing process by adjusting the angle of the loop waiting position at the outlet of the idle stand and the change time of the angle of the loop waiting position.
As shown in fig. 1, 2, 3 and 4, in the process of rolling the finish rolling empty stand, a strip 21 passes through the empty stand front stand, when the rolling time of the empty stand front stand is equal to the time t required by the real-time rolling strip length L of the empty stand front stand to reach the rolling length calculation value L of the empty stand front stand, the loop angle at the inlet of the empty stand is changed from an original initial waiting position angle c to a steel waiting position angle d, when the strip 21 enters the empty stand rear stand, the loop angle is changed from the steel waiting position angle d to a steel rolling working angle h, when the strip 21 is thrown out of the empty stand front stand, the loop angle at the inlet of the empty stand is changed from the steel rolling working angle h to an original initial waiting position angle c, and when the loop angle at the outlet of the empty stand is changed from the original initial waiting position angle c to a steel throwing waiting position angle g until the strip 21 is thrown out of the empty stand, and the loop angle at the outlet of the empty rack is restored to the initial waiting position angle c.
The method specifically comprises the following steps:
(1) according to the distance D from the loop base at the entrance of the air passing rack to the front rack of the air passing rack X1 Length L of force arm of loop at entrance P And calculating the initial waiting position angle c of the loop at the inlet to obtain the rolling length L of the rack before the empty rack;
(2) according to the linear speed V of the roller passing through the front frame of the frame R And a forward slip value f, calculating the time t when the length L of the real-time rolled strip steel passing through the front frame of the stand reaches the calculated length L in the step (1);
(3) according to the time t obtained by the calculation in the step (2), controlling the loop angle at the inlet of the empty rack from the initial waiting position angle c to the steel-passing waiting position angle d, and after the rack bites steel after the empty rack passes through, controlling the loop angle at the inlet of the empty rack to the normal steel rolling working angle h;
(4) and after a steel throwing signal is generated according to the front frame of the empty frame, controlling the loop at the inlet of the empty frame to recover to a steel feeding waiting position angle c from a steel rolling working angle h, and controlling the loop at the outlet of the empty frame to start to a steel throwing waiting position angle g from the steel feeding waiting position c.
The following description is given with reference to specific examples.
Example 1
In the specific implementation process, assuming that the empty stand is finish rolling F3, the operation is performed according to the following steps:
(1) according to the distance D from the loop base at the inlet F3 to F2 X1 Length L of force arm of loop at entrance P And calculating the initial waiting position angle c of the loop at the inlet to obtain the rolling length L of F2, wherein L is equal to L P ×cosc+D X1 +ΔX，L P Is the length of the force arm of the loop, and the unit is mm; c is the initial waiting position angle of the loop at the inlet, and the unit is degree; d X1 The distance from the loop base to F2 at an inlet F3 is in mm; delta X is F2, calculating the compensation quantity of the rolled length, and the unit is mm;
(2) according to the linear speed V of the F2 roller R And F, calculating the time t, L is V, used when the length L of the F2 real-time rolled strip reaches the length L calculated in the step (1) R ×(1+f)×t，V R Is the roll line speed of F2,the unit is mm/s, F is a forward slip value, t is the time required for the length L of the real-time rolled strip steel of F2 to reach the length L of the real-time rolled strip steel of F2, and the unit is s;
(3) according to the time t calculated in the step (2), controlling the loop angle at the F3 inlet from the initial waiting position angle c to the steel passing waiting position angle d, and after the F4 bites steel, controlling the loop angle at the F3 inlet to the normal steel rolling working angle h;
(4) and after a steel throwing signal is generated according to F2, controlling the loop at the F3 inlet to recover to a steel feeding waiting position angle c from a steel rolling working angle h, controlling the loop at the F3 outlet to recover to a steel throwing waiting position angle g from a steel feeding front waiting position c, and after the F4 throws steel, recovering the loop at the F3 outlet to a steel throwing front waiting position c from the steel throwing waiting position angle g.
The schematic diagram of the strip steel entering the front rack of the empty rack in the process is shown in fig. 1, the schematic diagram of the loop of the strip steel passing the inlet of the empty rack is shown in fig. 2, the schematic diagram of the strip steel passing the rear rack of the empty rack is shown in fig. 3, and the schematic diagram of the strip steel throwing out of the front rack of the empty rack is shown in fig. 4.
The method is successfully applied to a certain hot rolling field and is favored by users.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (3)
1. A loop control method for preventing a hot-rolled blank from passing through a rack to scratch the head and the tail of strip steel is characterized by comprising the following steps: the method comprises the following steps:
(1) according to the distance D from the loop base at the entrance of the air passing rack to the front rack of the air passing rack X1 Length L of force arm of loop at entrance P And calculating the initial waiting position angle c of the loop at the inlet to obtain the rolling length L of the rack before the empty rack;
(2) according to the linear speed V of the roller passing through the front frame of the frame R Calculating the time t when the length L of the real-time rolled strip steel (21) passing through the front frame of the frame reaches the calculated length L in the step (1) according to the forward slip value f;
(3) according to the time t obtained by the calculation in the step (2), controlling the loop angle of the inlet of the empty rack from the initial waiting position angle c to the steel-passing waiting position angle d, and after the rack bites steel after the empty rack passes through, controlling the loop angle of the inlet of the empty rack to the normal steel rolling working angle h;
(4) after a steel throwing signal of a front frame of the empty frame is generated, controlling the loop at the inlet of the empty frame to recover to an initial waiting position angle c from a steel rolling working angle h, and controlling the loop at the outlet of the empty frame to play a steel throwing waiting position angle g from the initial waiting position angle c before steel feeding;
the calculation formula of the rolling length L of the hollow frame passing through the front frame in the step (1) is as follows:
L＝L P ×cosc+D X1 +ΔX，
wherein L is P The length of the force arm of the loop is in mm; c is the initial waiting position angle of the loop at the inlet, and the unit is degree; d X1 The distance from the looping base to the front frame of the vacant rack is from the entrance of the vacant rack, and the unit is mm; delta X is the compensation quantity of the calculated rolling length of the front frame of the empty frame, and the unit is mm;
the method comprises the steps that a rolling length compensation quantity delta X is calculated by a front frame passing through a vacant frame and is used for compensating the calculated value error of the length of rolled strip steel (21) caused by the calibration error of a loop angle, and the value range is an interval < -a, a >, wherein a is 0-100;
the calculation formula of the time t when the length L of the strip steel (21) rolled out in real time by passing through the front frame of the frame in the step (2) reaches the length L calculated in the step (1) is as follows:
l＝V R ×(1+f)×t，
wherein, V R The linear speed of the roller of the front frame of the empty frame is in mm/s, f is a forward slip value, t is the time required by the length L of the strip steel rolled by the front frame of the empty frame to reach the rolling length L of the front frame of the empty frame, and the unit is s.
2. The loop control method for preventing the hot-rolled blank passing through the machine frame from scratching the head and the tail of the strip steel according to claim 1, which is characterized in that: and (3) the value range of the steel passing waiting position angle d of the loop at the hollow frame passing inlet is an interval [0, b ], wherein b is 0-5 and the unit is.
3. The loop control method for preventing the hot-rolled blank passing through the machine frame from scratching the head and the tail of the strip steel according to claim 1, which is characterized in that: and (3) the value range of the loop steel throwing waiting position angle g at the hollow frame outlet in the step (4) is an interval [0, e ], wherein e is 0-5 and the unit is.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011306262.2A CN112588834B (en) | 2020-11-19 | 2020-11-19 | Loop control method for preventing hot rolling air from passing through rack to scratch strip steel head and tail |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011306262.2A CN112588834B (en) | 2020-11-19 | 2020-11-19 | Loop control method for preventing hot rolling air from passing through rack to scratch strip steel head and tail |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112588834A CN112588834A (en) | 2021-04-02 |
| CN112588834B true CN112588834B (en) | 2022-08-30 |
Family
ID=75183279
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011306262.2A Active CN112588834B (en) | 2020-11-19 | 2020-11-19 | Loop control method for preventing hot rolling air from passing through rack to scratch strip steel head and tail |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112588834B (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07124608A (en) * | 1993-11-02 | 1995-05-16 | Kawasaki Steel Corp | Finish rolling method for joint part |
| CN101099977A (en) * | 2006-07-06 | 2008-01-09 | 宝山钢铁股份有限公司 | Finish rolling machine strip steel threading between frames movable sleeve controlling method |
| CN101625549A (en) * | 2009-08-13 | 2010-01-13 | 山西太钢不锈钢股份有限公司 | Highly automatic control method of special steel looper of trouble rolling mill |
| CN103170507A (en) * | 2013-03-26 | 2013-06-26 | 鞍钢股份有限公司 | Method for preventing surface of strip steel from being scratched when strip steel passes through finishing mill |
| CN103272854A (en) * | 2013-05-24 | 2013-09-04 | 山西太钢不锈钢股份有限公司 | Idle hot continuous rolling fault rolling mill special steel loop control method |
| CN104249082A (en) * | 2014-09-23 | 2014-12-31 | 山西太钢不锈钢股份有限公司 | Method for controlling loops of hot continuous rolling mills for special steel with thick specifications during technological idle setting |
| CN105057365A (en) * | 2015-07-21 | 2015-11-18 | 首钢京唐钢铁联合有限责任公司 | Control method for preventing strip steel finish rolling drift |
| CN105728460A (en) * | 2016-03-08 | 2016-07-06 | 首钢京唐钢铁联合有限责任公司 | Method for preventing thick strip steel from being scratched between finishing mill frames |
| CN111618092A (en) * | 2020-06-01 | 2020-09-04 | 宝钢湛江钢铁有限公司 | Control method for reducing scratch defects of thick plate finish rolling |
-
2020
- 2020-11-19 CN CN202011306262.2A patent/CN112588834B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07124608A (en) * | 1993-11-02 | 1995-05-16 | Kawasaki Steel Corp | Finish rolling method for joint part |
| CN101099977A (en) * | 2006-07-06 | 2008-01-09 | 宝山钢铁股份有限公司 | Finish rolling machine strip steel threading between frames movable sleeve controlling method |
| CN101625549A (en) * | 2009-08-13 | 2010-01-13 | 山西太钢不锈钢股份有限公司 | Highly automatic control method of special steel looper of trouble rolling mill |
| CN103170507A (en) * | 2013-03-26 | 2013-06-26 | 鞍钢股份有限公司 | Method for preventing surface of strip steel from being scratched when strip steel passes through finishing mill |
| CN103272854A (en) * | 2013-05-24 | 2013-09-04 | 山西太钢不锈钢股份有限公司 | Idle hot continuous rolling fault rolling mill special steel loop control method |
| CN104249082A (en) * | 2014-09-23 | 2014-12-31 | 山西太钢不锈钢股份有限公司 | Method for controlling loops of hot continuous rolling mills for special steel with thick specifications during technological idle setting |
| CN105057365A (en) * | 2015-07-21 | 2015-11-18 | 首钢京唐钢铁联合有限责任公司 | Control method for preventing strip steel finish rolling drift |
| CN105728460A (en) * | 2016-03-08 | 2016-07-06 | 首钢京唐钢铁联合有限责任公司 | Method for preventing thick strip steel from being scratched between finishing mill frames |
| CN111618092A (en) * | 2020-06-01 | 2020-09-04 | 宝钢湛江钢铁有限公司 | Control method for reducing scratch defects of thick plate finish rolling |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112588834A (en) | 2021-04-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| RU2070584C1 (en) | Method and aggregate for combined continuous casting-rolling to produce steel bans rolls | |
| CN110665965A (en) | Stable production method of hot-rolled extreme thin cold-rolled base material | |
| CN110216151B (en) | Control method for eliminating flying and warping of short-process ultrathin strip steel | |
| CN112916616B (en) | Process for rolling sheet billet checkered plate by common hot-rolled strip steel production line | |
| CN112588834B (en) | Loop control method for preventing hot rolling air from passing through rack to scratch strip steel head and tail | |
| CN108838213B (en) | Roughing vertical roll idle-passing method | |
| CN112845619B (en) | Method for reducing residual stress at tail of hot-rolled high-strength strip steel | |
| CN112958633A (en) | Incoming material camber-based fine rolling strip steel head pre-swing leveling control method | |
| CN110064663B (en) | Control method for reducing scratch length of coiler wrapper on surface of aluminum strip | |
| CN113263062B (en) | Control method and device for loop of hot continuous rolling finishing mill unit | |
| CN114029345B (en) | Method for controlling tail plate shape of hot-rolled rough-rolled intermediate billet | |
| CN110355216B (en) | Control method for eliminating tail transverse vibration line offset of short-process thin strip steel | |
| CN113134515B (en) | Method for controlling width of strip steel by utilizing front vertical roll of finishing mill in hot continuous rolling production line | |
| JP2981797B2 (en) | Adjustment method of running schedule of tandem rolling mill | |
| CN113275385A (en) | Method for dynamically controlling to-be-rolled position of single-stand rolling mill | |
| CN114433639B (en) | Production method capable of reducing flying and warping of ultrathin strip steel on CSP production line | |
| CN111922093B (en) | Method for controlling scratch of ultra-pure stainless steel at finishing mill inlet | |
| JP2782860B2 (en) | Strip cold rolling method | |
| JPH05212406A (en) | Method for controlling temper-rolling | |
| JP3584923B2 (en) | Hot rolled steel sheet manufacturing method | |
| CN114535309B (en) | Rolling mill adjusting method for improving hot continuous rolling break and tail flick | |
| CN111992588B (en) | Method for controlling cold-rise of sleeve of strip steel layer | |
| CN112007959B (en) | Control method for improving plate shape of free rolling strip steel | |
| CN117753798A (en) | Operation method for reducing contusion defect of flat surface of thin strip steel | |
| CN115365297A (en) | Smooth and stable production control method for continuous annealing thin and wide limit specification household electrical appliance steel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |