CN101670374A - Low-temperature laminar cooling control method of hot rolled strip steel - Google Patents
Low-temperature laminar cooling control method of hot rolled strip steel Download PDFInfo
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- CN101670374A CN101670374A CN200910075553A CN200910075553A CN101670374A CN 101670374 A CN101670374 A CN 101670374A CN 200910075553 A CN200910075553 A CN 200910075553A CN 200910075553 A CN200910075553 A CN 200910075553A CN 101670374 A CN101670374 A CN 101670374A
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Abstract
The invention relates to a low-temperature laminar cooling control method of a hot rolled strip steel, which aims at improving the tensile strength and the yield strength of a product and reducing theadding amount of noble metals through the low-temperature cooling control. The method comprises the steps of using two temperature measuring meters with different scales in a hot-rolling laminar flowcooling area for improving the temperature detection precision; automatically switching the high/low temperature scale temperature measuring meters in an on-line manner according to the rolling technology for carrying out the laminar cooling temperature control; using pulse signals of a fine rolling and winding device for amending the detection loss of the laminar cooling temperature measuring meters, and emitting one pulse signal by a pulse generator at each time that a motor shaft turns a circle after that the strip steel achieves a rack at the end of a fine rolling unit; and calculating the distance of going forward of the strip steel according to the rotational speed of a rolling machine at each time that a laminar cooling control system obtains one pulse signal.
Description
Technical field
The present invention relates to a kind of according to the different range temperature instrumentations of the on-line automatic switching of rolling mill practice and adopt the inspection of device pulse signal correction temperature to lose and carry out the cold temperature controlled method of layer.
Background technology
The control of strip coiling temperature has become the important step of hot-rolled process, directly influences final tissue morphology of finished strip and mechanical property, and therefore, the coiling temperature control accuracy plays vital decisive action to band steel mechanical performance.Reduce the noble metal component content in recent years, improve mechanical performances such as product tension and yield strength, become the exploitation direction that each steel industry reduces cost by taking sub-cooled.Yet because the low temperature control difficulty of laminar flow cooling is bigger, the production of low-temperature steel is very stubborn problem of hot continuous rolling factory always.The rolling low temperate zone of present domestic steel industry steel all adopts the cold open loop control of layer, and this method control accuracy instability is difficult to form large-scale production.
Summary of the invention
The present invention seeks to overcoming the deficiency of above-mentioned prior art, a kind of low-temperature laminar cooling control method of hot rolled strip steel that improves product tension and yield strength, reduction noble metal addition by sub-cooled control is provided.
The inventive method is:
(1) use two kinds of different range temperature instrumentations to improve temperature detecting precision in the hot-rolling laminar cooling zone; Conventional temperature instrumentation range ability is 300 ℃-1200 ℃; The lower range temperature instrumentation is 150 ℃-800 ℃;
(2) carry out the cold temperature control of layer according to the high/low temperature range of the on-line automatic switching of rolling mill practice temperature instrumentation; The cold temperature of layer (CT) adopts conventional temperature instrumentation to carry out temperature online control greater than 550 ℃; Otherwise just adopt the lower range temperature instrumentation to carry out temperature online control;
(3) use the cold temperature measurer inspection of finish rolling and taking-up equipment pulse signal modification level to lose, after the band steel arrived mm finishing mill unit end frame (F7), the F7 motor shaft whenever turned around, and impulse generator sends a pulse signal; The cold control system of layer whenever obtains a pulse signal, calculates the distance that the band steel moves forward according to the rotating speed of milling train.After mm finishing mill unit end milling train was thrown steel, the pulse signal of the coiling machine (DC) of then migrating was followed the tracks of control; The reel of coiling machine whenever turns around and sends a pulse signal equally, and the cold control system of layer whenever receives a pulse signal, calculates the distance that the band steel moves forward according to the tachometer of reel.
The present invention is suitable for using on all hot-rolled strip production lines.This method is cold by adopting low-temperature laminar cooling control method of hot rolled strip steel to control, and improves product tension and yield strength with sub-cooled, has reduced the noble metal addition; Have good applicability and excellent generalization values.High strength steel, high-grade pipe line steel etc. all can improve surrender of band steel and tensile strength by adopting the low temperature control of laminar flow cooling.Properties of product control is stable, and layer cold control accuracy (CT) and a properties percent of pass are all above 95%.
The specific embodiment
The present invention is on probation in Taiyuan Iron ﹠ Steel Group Co., Ltd..After the 2250mm hot rolling line was gone into operation, the cold outlet temperature detector of layer adopted two working methods that are equipped with, and two temperature instrumentations are called after CT1 and CT2 respectively, and CT1 and CT2 model are identical, 300 ℃-1200 ℃ of range abilities.After a temperature instrumentation fault, adopt another to carry out On-line Control.When the cold target temperature of layer (CT) is lower than 500 ℃, because the cooling valve group of opening on the runout table is more, coiling temperature is low, belt steel surface is covering moisture film, causes surface temperature inhomogeneous, and the temperature detection fluctuation is big, the temperature difference of former and later two test points is above 100 ℃, cause laminar cooling system to be difficult to control, the CT control accuracy is low, the Properties Control instability.In addition, be 280 ℃ because dual phase steel etc. batch target temperature, original pyroscope CT1, CT2 can't detect coiling temperature, make the cold automatic control of layer (CTC) to drop into.Introduce for this reason and can detect the more temperature instrumentation CT3 of low temperature, range ability is 150 ℃-800 ℃.This instrument has adjustable average detected time 0.2-24.0s, and temperature detecting point is averaged processing, to reduce the influence of partial points temperature fluctuation.
For not influencing the original system design, lower range temperature instrumentation CT3 is installed on the existing CT1/CT2 pyroscope stand, its major advantage is same point can be adjusted in the detection position of CT1, CT2, CT3, so that the detected status of each temperature element is analyzed; In the control system development, because CT3 is in same position with conventional temperature instrumentation CT1, CT2 on rolling line is arranged, therefore carry out in the cold control procedure of online layer enabling CT3, the rolling line that does not influence original system is followed the tracks of.
After the on-the-spot installation of CT3, CT3 is inserted automatic control system, the CT3 temperature detection result is write down, follows the tracks of and analyzes.Concrete workflow is: CT3 is connected with basic automatization level (L1) simulation and digital input card by cable, realizes the data communication of L1 and CT3 instrument cubicle; Data communication point between definition L1 and the automatic controlled stage of process (L2) is realized the communication of CT3 collection in worksite signal and L2; In the current belt steel rolling process, L2 writes down the CT3 temperature of each collection point automatically, and deposits in the data file; The reading corresponding data file, the temperature detection curve of comparison check same rolled band steel CT1, CT2, CT3 is adjusted CT3 Equipment Inspection point and equipment control parameter, makes the temperature detection of CT3 and CT1, CT2 be consistent.
According to the cold target temperature of layer, select different CT temperature measurers automatically for use, when the cold temperature of layer (CT) greater than 550 ℃, the selected range scope is at traditional temperature instrumentation of 300 ℃-1200 ℃; Otherwise the selected range scope is at 150 ℃-800 ℃ temperature instrumentation; The temperature instrumentation that the cold control model of layer selected according to above-mentioned steps reads the temperature measured value of corresponding instrument, carries out the cold FEEDBACK CONTROL of layer, dynamically control and layer cold adaptive process; The band steel is after coiling machine unloads volume and finishes, and online quality classification statistics process reads the temperature instrumentation detection record that above-mentioned steps is selected, and carries out the cold control accuracy statistics of this piece band steel layer.Adopting this mode temperature controlled stability of steel CT of can significantly making better products, is that precondition is created in steel layer cold automatic control in low temperate zone.
In theory, traditional high temperature instrument can examine the band steel more than 300 ℃, the low temperature instrument can examine the band steel more than 150 ℃.Yet when adopting water-cooled, especially cooling water inflow big, when belt steel temperature is low, influenced by belt steel surface moisture film etc., the CT temperature measurer inspection often occurs and loses phenomenon in the belt steel rolling process.Because CT can not normally examine to such an extent that be with the steel position, cause the cold tracking of layer to make mistakes, can't cool off control normally.Need by calculating the actual travel distance correction of band steel detector inspection mistake problem, after the band steel arrived mm finishing mill unit end frame (F7), the F7 motor shaft whenever turned around for this reason, and impulse generator sends a pulse signal.The cold control system of layer judged the tracing positional of band steel according to each pulse signal that receives.That is to say, whenever obtain a pulse signal, calculate the distance that the band steel moves forward according to the rotating speed of milling train.After the F7 milling train was thrown steel, the pulse signal of the coiling machine (DC) of then migrating was followed the tracks of control.The reel of coiling machine whenever turns around and sends a pulse signal equally.The cold control system of layer whenever receives a pulse signal, calculates the distance that the band steel moves forward according to the rotating speed of reel.Even if cause the thermometer inspection to lose because the belt steel surface temperature is low, follow the tracks of owing to adopt pulse signal to carry out the rolled piece Position Tracking Control, can not produce control and follow the tracks of unusual problem, guarantee that model can carry out normal temperature control.
Claims (3)
1, a kind of low-temperature laminar cooling control method of hot rolled strip steel is characterized in that:
(1) use two kinds of different range temperature instrumentations to improve temperature detecting precision in the hot-rolling laminar cooling zone; Conventional temperature instrumentation range ability is 300 ℃-1200 ℃; The lower range temperature instrumentation is 150 ℃-800 ℃;
(2) carry out the cold temperature control of layer according to the high/low temperature range of the on-line automatic switching of rolling mill practice temperature instrumentation; The cold temperature of layer adopts conventional temperature instrumentation to carry out temperature online control greater than 550 ℃; Otherwise just adopt the lower range temperature instrumentation to carry out temperature online control;
(3) use the cold temperature measurer inspection of finish rolling and taking-up equipment pulse signal modification level to lose, after the band steel arrived mm finishing mill unit end frame, motor shaft whenever turned around, and impulse generator sends a pulse signal; The cold control system of layer whenever obtains a pulse signal, calculates the distance that the band steel moves forward according to the rotating speed of milling train; After mm finishing mill unit end milling train was thrown steel, the pulse signal of the coiling machine of then migrating was followed the tracks of control; The reel of coiling machine whenever turns around and sends a pulse signal equally, and the cold control system of layer whenever receives a pulse signal, calculates the distance that the band steel moves forward according to the tachometer of reel.
2, low-temperature laminar cooling control method of hot rolled strip steel as claimed in claim 1 is characterized in that lower range temperature instrumentation rolling line is arranged upward and conventional temperature instrumentation is in same position, is convenient to the detected status of each temperature element is analyzed.
3, low-temperature laminar cooling control method of hot rolled strip steel as claimed in claim 1 is characterized in that the lower range temperature instrumentation is connected with simulation of basic automatization level and digital input card by cable, realizes the data communication of instrument cubicle; Data communication point between definition basic automatization level and the automatic controlled stage of process is realized the communication of lower range temperature instrumentation collection in worksite signal and the automatic control data of process.
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| CN200910075553A CN101670374A (en) | 2009-09-24 | 2009-09-24 | Low-temperature laminar cooling control method of hot rolled strip steel |
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| CN200910075553A CN101670374A (en) | 2009-09-24 | 2009-09-24 | Low-temperature laminar cooling control method of hot rolled strip steel |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102034284A (en) * | 2010-09-28 | 2011-04-27 | 魏卿轩 | Device for recording real-time controlled cooling temperature curve graph of steel on controlled cooling line after hot rolling |
| CN104841701A (en) * | 2014-02-14 | 2015-08-19 | 宝山钢铁股份有限公司 | Sheet coiling temperature control method in big-speed-reduction rolling of hot-rolled strip steel |
| CN105522004A (en) * | 2014-09-30 | 2016-04-27 | 上海梅山钢铁股份有限公司 | Control and statistical method for ship-shaped rolling temperature precision of hot-rolled strip steel |
| CN105537281A (en) * | 2015-12-07 | 2016-05-04 | 北京首钢股份有限公司 | Method for improving coiling temperature control accuracy under laminar cooling model |
| CN114011878A (en) * | 2021-10-12 | 2022-02-08 | 山西太钢不锈钢股份有限公司 | Pinch roll lifting control method in hot rolling and steel rolling process of steel grade based on characteristic brittleness |
-
2009
- 2009-09-24 CN CN200910075553A patent/CN101670374A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102034284A (en) * | 2010-09-28 | 2011-04-27 | 魏卿轩 | Device for recording real-time controlled cooling temperature curve graph of steel on controlled cooling line after hot rolling |
| CN104841701A (en) * | 2014-02-14 | 2015-08-19 | 宝山钢铁股份有限公司 | Sheet coiling temperature control method in big-speed-reduction rolling of hot-rolled strip steel |
| CN105522004A (en) * | 2014-09-30 | 2016-04-27 | 上海梅山钢铁股份有限公司 | Control and statistical method for ship-shaped rolling temperature precision of hot-rolled strip steel |
| CN105537281A (en) * | 2015-12-07 | 2016-05-04 | 北京首钢股份有限公司 | Method for improving coiling temperature control accuracy under laminar cooling model |
| CN105537281B (en) * | 2015-12-07 | 2018-01-12 | 北京首钢股份有限公司 | A kind of method for improving control precision of coiling temperature under layer chill type |
| CN114011878A (en) * | 2021-10-12 | 2022-02-08 | 山西太钢不锈钢股份有限公司 | Pinch roll lifting control method in hot rolling and steel rolling process of steel grade based on characteristic brittleness |
| CN114011878B (en) * | 2021-10-12 | 2024-03-26 | 山西太钢不锈钢股份有限公司 | Method for controlling lifting of pinch roll in process of hot rolling coil steel of steel grade based on characteristic brittleness |
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