CN103962393A - Strip steel thickness feedforward control method based on strip steel performance detection - Google Patents
Strip steel thickness feedforward control method based on strip steel performance detection Download PDFInfo
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- 238000005096 rolling process Methods 0.000 claims abstract description 112
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- 238000005097 cold rolling Methods 0.000 description 2
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Abstract
The invention discloses a strip steel thickness feedforward control method based on strip steel performance detection. The method comprises the steps that (1) the models of a performance detector 6 and a thickness gauge 7 are determined; (2) the performance detector and the thickness gauge are installed; (3) a current steel coil thickness control coefficient is obtained; (4) strip steel thickness feedforward control information is obtained; (5) the strip steel thickness feedforward control information is stored; (6) the strip steel thickness feedforward control quantity is calculated, wherein in the rolling process of corresponding strip steel segments, corresponding deformation resistance fluctuating values and thickness fluctuating values are read from a storage unit, and the rolling control quantity is calculated according to a strip steel thickness feedforward control algorithm; (7) real-time thickness feedforward control is conducted, wherein the rolling control quantity is sent to a thickness control executing mechanism, and then real-time thickness feedforward control is completed. By means of the method, the plate thickness quality of a cold-rolled strip steel product can be improved.
Description
Technical Field
The invention relates to the field of plate and strip cold continuous rolling, in particular to a strip steel thickness feedforward control method based on strip steel performance detection.
Background
The rapid development of modern industry puts higher requirements on strip steel production, and the plate thickness is one of important indexes for measuring the quality of the strip steel, and the quality of the strip steel directly influences the yield and market competitiveness of products, so that the research on a plate thickness control method has important significance on the growth and the decline of the steel industry in China.
The thickness difference of incoming strip steel is an important reason of the thickness difference of a cold-rolled strip steel finished product, and in the prior art, a thickness gauge is generally arranged in front of a rack of a cold continuous rolling unit and used for directly measuring the thickness difference of the incoming strip steel to carry out thickness feedforward control. At present, most of automatic thickness control systems for cold continuous rolling only carry out feed-forward control on the thickness difference of incoming strip steel at a strip steel inlet, and the problem of the thickness difference of finished strip steel caused by the thickness value deviation of the incoming strip steel is well solved.
When a certain section of strip steel with performance deviation enters different rolling mills, new strip steel thickness difference is generated, namely, the influence of the performance fluctuation of incoming strip steel on the strip steel thickness difference has repeatability. With the continuous development and application of detection technology, the real-time detection of the performance of strip steel becomes possible, and a corresponding deformation resistance value can be obtained from the detection value of the performance of the strip steel and the deformation condition, but the existing steel rolling control does not introduce the performance detection of the strip steel of incoming materials for the thickness control of the strip steel, so that the thickness value deviation of a finished product of the strip steel caused by the performance fluctuation of the strip steel of the incoming materials cannot be effectively eliminated.
In the prior art, for a five-rolling-mill cold continuous rolling unit, more third rolling mills of the system generally do not perform automatic control on the thickness of strip steel, so that the deformation resistance values of all sections of strip steel are obtained according to a rolling force formula by utilizing the actually measured rolling force of the third rolling mill, and then the deformation resistance values of the strip steel during rolling of the fourth rolling mill and the fifth rolling mill are obtained by utilizing a deformation resistance value calculation formula, so that the feedforward control on the thickness of the strip steel is performed on the fourth rolling mill and the fifth rolling mill. However, in the cold continuous rolling process, the large rolling reduction is completed by an upstream rolling mill, and the influence of the fluctuation of the strip performance on the thickness difference of the strip steel has repeatability.
Disclosure of Invention
The patent aims to provide a strip steel thickness feedforward control method based on strip steel performance detection for improving the thickness quality of a cold-rolled strip steel product.
In order to achieve the above object, the concept of the present invention is as follows:
first, instrument configuration
Because the performance of incoming strip steel has great influence on the control precision of the thickness of the strip steel, and the measured data shows that the performance fluctuation of the incoming strip steel is very large, in the system configuration of the patent, a thickness gauge and a performance detector are arranged at the inlet side of a rolling mill, the thickness gauge is used for measuring the thickness value of the incoming strip steel on line, and the performance detector is used for measuring the performance value of the incoming strip steel on line;
secondly, calculating the deformation resistance value of the incoming strip steel, firstly calculating the deformation resistance value of the incoming strip steel in front of the first rolling mill, and recording the value as the deformation resistance valueThe calculation formula is as follows:
(1)
wherein,the yield strength value of the strip steel coming from the first rolling mill 1,the deformation resistance coefficient of the strip steel is shown;
then, the deformation resistance value of the incoming strip steel before the second rolling mill 2 to the fifth rolling mill 5 is calculated according to the following calculation formula:
(2)
wherein,is as followsThe deformation resistance value of the strip steel fed from the front of the frame,the thickness value of the incoming strip steel is taken as the thickness value,is as followsThe thickness value of the strip steel after the rolling of the frame,for the hardening coefficients of different frame strip steels,
presetting the deformation resistance value of the strip steel before each frame asThe fluctuation values of the deformation resistance of the strip steel of different frames are recorded asCalculated from the following formula:
(3)
strip steel thickness feedforward control algorithm based on strip steel performance detection
Firstly, in the cold rolling process of the strip steel before the first rolling mill 1 to the fifth rolling mill 5, calculating the thickness value and the rolling pressure of the strip steel, wherein the calculation formulas are respectively as follows:
(4)
(5)
wherein,the thickness values of the strip steel rolled by the first rolling mill 1 to the fifth rolling mill 5,roll gap signals of the first rolling mill 1 to the fifth rolling mill 5, rolling pressure values of the first rolling mill 1 to the fifth rolling mill 5,the pre-pressing bearing force values of the rollers of the first rolling mill 1 to the fifth rolling mill 5,roll gap changes are caused for the roll bending force values of the first rolling mill 1 to the fifth rolling mill 5,is the value of the pre-tension stress of the rolling mill,is the value of the post-tensioning stress of the rolling mill,
for the values of the strip thickness before rolling by the first rolling mill 1 to the fifth rolling mill 5,the deformation resistance value of the strip steel is shown,the friction coefficient between the strip steel and the roller is shown;
secondly, calculating the thickness increment of the strip steel and the rolling pressure increment of the strip steel, wherein the calculation formulas are respectively as follows:
(6)
(7)
wherein,the thickness of the strip steel is increased,the rolling pressure increment of the strip steel is realized,
substituting the strip steel rolling pressure increment calculation formula (7) into a strip steel thickness increment calculation formula (6) to obtain:
(8)
setting thickness difference of rolled strip steelThickness difference, get
(9)
Is provided with，The feedforward control algorithm of the strip thickness is as follows
(10)
According to the inventive concept, the invention adopts the following technical scheme:
a strip steel thickness feedforward control method based on strip steel performance detection is characterized by comprising the following specific operations:
(1) determining the types of the performance detector and the thickness gauge: determining the specific models of a performance detector and a thickness gauge according to the model of the rolling mill and the specification of incoming strip steel;
(2) installation performance detector and calibrator: the performance detector and the thickness gauge are arranged at the inlet side of the rolling mill and respectively have a distance ofAndthe position of (a);
(3) and obtaining the current steel coil thickness control coefficient: starting rolling, and acquiring the coil number, the specification, the rolling schedule and the strip steel thickness control coefficient of the current coil;
(4) acquiring feedforward control information of the thickness of the strip steel: in each thickness control period, acquiring a strip steel performance value and a thickness value, and calculating a deformation resistance value according to the strip steel performance value and the thickness value to obtain a deformation resistance fluctuation value and a thickness fluctuation value;
(5) storing the feedforward control information of the thickness of the strip steel: storing the deformation resistance fluctuation value and the thickness fluctuation value of each section of the strip steel into a memory;
(6) calculating the feedforward control quantity of the thickness of the strip steel: when rolling the corresponding section of strip steel, reading the corresponding deformation resistance fluctuation value and the thickness fluctuation value from the memory, and calculating according to the strip steel thickness feedforward control algorithm to obtain rolling control quantity;
(7) and real-time thickness feedforward control: and (5) sending the rolling control quantity to a thickness control executing mechanism to complete the real-time thickness feedforward control. Compared with the prior art, the invention has the following obvious substantive characteristics and obvious advantages:
the invention provides a band steel thickness feedforward control method based on band steel performance detection, which aims at the defect that the prior band steel thickness feedforward control method only considers the thickness fluctuation of incoming band steel but does not detect the band steel performance, provides a configuration and installation method of a performance detector and a thickness gauge, adopts the thickness fluctuation value and the deformation resistance fluctuation value of the incoming band steel to carry out band steel thickness feedforward control, and has good practical application value for ensuring the consistency of the thickness of finished band steel in the length direction of a whole steel coil and improving the rolling precision of the band steel thickness.
Drawings
FIG. 1 is a view showing the arrangement of the instrumentation and rolling mill of the present invention.
FIG. 2 is a block diagram of the operational procedure of the feedforward control method of the thickness of the strip steel based on the detection of the performance of the strip steel.
Detailed Description
The technical solution of the present invention is further described in detail by the accompanying drawings and preferred embodiments.
The embodiment is a strip steel thickness feedforward control method based on strip steel performance detection aiming at a five-stand six-roller UCM rolling mill.
The embodiments are described in detail below with reference to the accompanying drawings.
First, instrument configuration and installation
The performance detector 6 and the thickness gauge 7 are respectively arranged at the inlet of the first rolling mill 1, and the performance detector 6 and the thickness gauge 7 are arranged at a distance of the first rolling mill 1 inletAndthe device is respectively used for measuring the thickness value and the deformation resistance value of incoming strip steel on line, and the installation arrangement is shown in figure 1;
second, calculating the deformation resistance value of the incoming strip steel
First, the deformation resistance of the strip steel coming from the first rolling mill is calculated and recorded asThe calculation formula is as follows:
(1)
wherein,the yield strength value of the strip steel coming from the first rolling mill 1,is the deformation resistance coefficient of the strip steel,
then, the deformation resistance value of the incoming strip steel before the second rolling mill 2 to the fifth rolling mill 5 is calculated according to the following calculation formula:
(2)
wherein,is as followsThe deformation resistance value of the strip steel fed from the front of the frame,the thickness value of the incoming strip steel is taken as the thickness value,is as followsThe thickness value of the strip steel after the rolling of the frame,for the hardening coefficients of different frame strip steels,
presetting the deformation resistance value of the strip steel before each frame asThe fluctuation values of the deformation resistance of the strip steel of different frames are recorded asCalculated from the following formula:
(3)
strip steel thickness feedforward control algorithm based on strip steel performance detection
Firstly, in the cold rolling process of the strip steel fed from the first rolling mill 1 to the fifth rolling mill 5, the thickness value and the rolling pressure of the strip steel are calculated by the following calculation formulas:
(4)
(5)
wherein,the thickness values of the strip steel rolled by the first rolling mill 1 to the fifth rolling mill 5,roll gap signals of the first rolling mill 1 to the fifth rolling mill 5,rolling pressure values for the first rolling mill 1 to the fifth rolling mill 5,the pre-pressing bearing force values of the rollers of the first rolling mill 1 to the fifth rolling mill 5,roll gap changes are caused for the roll bending force values of the first rolling mill 1 to the fifth rolling mill 5,is the value of the pre-tension stress of the rolling mill,is the value of the post-tensioning stress of the rolling mill,for the values of the strip thickness before rolling by the first rolling mill 1 to the fifth rolling mill 5,the deformation resistance value of the strip steel is shown,the friction coefficient between the strip steel and the roller is shown;
secondly, calculating the thickness increment of the strip steel and the rolling pressure increment of the strip steel, wherein the calculation formulas are respectively as follows:
(6)
(7)
wherein,the thickness of the strip steel is increased,rolling pressure increment for strip steel
Substituting the strip steel rolling pressure increment calculation formula (7) into a strip steel thickness increment calculation formula (6) to obtain:
(8)
setting thickness difference of rolled strip steelThickness difference, get
(9)
Is provided with，The feedforward control algorithm of the strip thickness is as follows
(10)
The feedforward control method for the thickness of the strip steel based on the performance detection of the strip steel specifically operates as follows (see figure 2):
(1) and determining the types of the performance detector 6 and the thickness gauge 7: the specific models of the performance detector 6 and the thickness gauge 7 are determined according to the models of the first rolling mill 1, the second rolling mill 2, the third rolling mill 3, the fourth rolling mill 4 and the fifth rolling mill 5 and the specification of incoming strip steel;
(2) installation performance detector 6 and calibrator 7: the performance detector 6 and the thickness gauge 7 are arranged at the inlet side of the rolling mill at the distance of the rolling mill respectivelyAndthe location of (a), for example,is 3000mm andis 2500 mm;
(3) and obtaining the current steel coil thickness control coefficient: starting rolling, and acquiring the coil number, the specification, the rolling schedule and the strip steel thickness control coefficient of the current coil;
(4) acquiring feedforward control information of the thickness of the strip steel: in each thickness control period, acquiring a strip steel performance value and a thickness value, and calculating a deformation resistance value according to the strip steel performance value and the thickness value to obtain a deformation resistance fluctuation value and a thickness fluctuation value;
(5) storing the feedforward control information of the thickness of the strip steel: storing the deformation resistance fluctuation value and the thickness fluctuation value of each section of the strip steel into a memory;
(6) calculating the feedforward control quantity of the thickness of the strip steel: when rolling the corresponding section of strip steel, reading the corresponding deformation resistance fluctuation value and the thickness fluctuation value from the memory, and calculating according to the strip steel thickness feedforward control algorithm to obtain rolling control quantity;
(7) and real-time thickness feedforward control: and (5) sending the rolling control quantity to a thickness control executing mechanism to complete the real-time thickness feedforward control.
Claims (1)
1. A strip steel thickness feedforward control method based on strip steel performance detection is characterized by comprising the following specific steps:
(1) determining the types of the performance detector (6) and the thickness gauge (7): determining the specific models of a performance detector (6) and a thickness gauge (7) according to the models of a first rolling mill (1), a second rolling mill (2), a third rolling mill (3), a fourth rolling mill (4) and a fifth rolling mill (5) and the specification of incoming strip steel;
(2) installation performance detector (6) and calibrator (7): the performance detector (6) and the thickness gauge (7) are arranged at the inlet side of the rolling mill and are respectively spaced from the rolling millA distance ofAndthe position of (a);
(3) and obtaining the current steel coil thickness control coefficient: starting rolling, and acquiring the coil number, the specification, the rolling schedule and the strip steel thickness control coefficient of the current coil;
(4) acquiring feedforward control information of the thickness of the strip steel: in each thickness control period, acquiring a strip steel performance value and a thickness value, and calculating a deformation resistance value according to the strip steel performance value and the thickness value to obtain a deformation resistance fluctuation value and a thickness fluctuation value;
(5) storing the feedforward control information of the thickness of the strip steel: storing the deformation resistance fluctuation value and the thickness fluctuation value of each section of the strip steel into a memory;
(6) calculating the feedforward control quantity of the thickness of the strip steel: when rolling the corresponding section of strip steel, reading the corresponding deformation resistance fluctuation value and the thickness fluctuation value from the memory, and calculating according to the strip steel thickness feedforward control algorithm to obtain rolling control quantity;
(7) and real-time thickness feedforward control: and (5) sending the rolling control quantity to a thickness control executing mechanism to complete the real-time thickness feedforward control.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111069300A (en) * | 2019-12-30 | 2020-04-28 | 新疆八一钢铁股份有限公司 | Production method of cold-rolled super-thick high-precision motor casing steel |
| CN116550764A (en) * | 2023-05-05 | 2023-08-08 | 燕山大学 | Feed-forward thickness control method of hot continuous rolling mill based on vibration test analysis of working rolls |
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| JPH0413411A (en) * | 1990-05-02 | 1992-01-17 | Kawasaki Steel Corp | Method for controlling strip thickness when strip is passed through in hot continuous mill |
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| CN102029292A (en) * | 2009-09-28 | 2011-04-27 | 宝山钢铁股份有限公司 | Strip steel thickness feedforward control method based on mechanical property detection |
| CN102107224A (en) * | 2009-12-24 | 2011-06-29 | 上海梅山钢铁股份有限公司 | Method for judging thickness abnormality of thickness tester and hot-rolled plate during hot rolling production |
| CN102189117A (en) * | 2010-03-16 | 2011-09-21 | 宝山钢铁股份有限公司 | Cold rolled steel strip straightness feedforward control method based on transverse performance detection |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH0413411A (en) * | 1990-05-02 | 1992-01-17 | Kawasaki Steel Corp | Method for controlling strip thickness when strip is passed through in hot continuous mill |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111069300A (en) * | 2019-12-30 | 2020-04-28 | 新疆八一钢铁股份有限公司 | Production method of cold-rolled super-thick high-precision motor casing steel |
| CN116550764A (en) * | 2023-05-05 | 2023-08-08 | 燕山大学 | Feed-forward thickness control method of hot continuous rolling mill based on vibration test analysis of working rolls |
| CN116550764B (en) * | 2023-05-05 | 2024-04-26 | 燕山大学 | Feed-forward thickness control method of hot continuous rolling mill based on vibration test analysis of working rolls |
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Application publication date: 20140806 |