CN112974545B - Method for preventing and controlling S-shaped middle wave defect of extremely-thin T5 material - Google Patents
Method for preventing and controlling S-shaped middle wave defect of extremely-thin T5 material Download PDFInfo
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Abstract
The invention relates to a method for preventing and controlling S-shaped middle wave defects of an extremely-thin T5 material, which comprises the following steps of: s1: adjusting and setting parameters of a control model, S2, tracking and acquiring process data, S3: optimization of the pitch control, S4: and (4) roll bending control optimization. The control model data that this scheme need gather and adjust are the normal real-time process data of production line, and the collection of relevant data is judged, the adjustment process is convenient, need not additionally to increase data acquisition equipment, can accomplish through production line process control computer and gather and data operation and judge, has the characteristics of quick implementation.
Description
Technical Field
The invention relates to a prevention and control method, in particular to a method for preventing and controlling S-shaped middle wave defects of an ultrathin T5 material, and belongs to the technical field of cold rolling.
Background
At present, a large amount of cold-rolled steel strips are widely used in the fields of automobiles, household appliances, packaging and the like, and due to the consideration of light weight and low cost, thinner products with higher performance and strength are increasingly required to be used. Referring to fig. 1, when rolling a steel strip with an extremely thin gauge T5 (thickness 0.17-0.2mm, yield strength 320Mpa, and tensile strength 420Mpa) in a conventional 5-stand 6-roll UCM cold continuous rolling mill, a suitable transition material is generally arranged to avoid changing the working roll of the fifth stand on the extremely thin T5 material, but the roll change on the T5 material is forced when an abnormal condition (such as surface scratch of the steel strip) occurs. When the fifth frame working roll is replaced in the production process of the T5 material, the first rolled strip steel after the roll replacement is finished is easy to generate alternately asymmetric bubble waves, so that the shape of the whole roll is poor, and the yield of the T5 strip steel is seriously influenced.
The measurement finds that the bubble wave can be approximately a projection shape with the diameter of about 70 mm-80 mm, the bubble wave is approximately circular, the three-dimensional appearance is a bulge type buckling wave shape, the bubble height is about 0.4mm, the bubble wave is irregularly distributed in the length direction and the width direction of the strip steel, sometimes the bubble wave is intensively distributed on the working side of the strip steel, sometimes the bubble wave is intensively distributed on the transmission side of the strip steel, and is alternately distributed in the full-length range of the strip steel, and the bubble wave has the characteristics of bilateral alternation and asymmetry. When the method is seen from a plate shape stress cloud chart actually measured by a plate shape instrument, an over-extension area of the type of plate shape defects mainly appears in the middle area of strip steel, a very wide middle wave even approaching the full width of the strip steel exists similarly, the maximum extension point of the middle wave in the width direction is in an S shape periodically and continuously changing along the length direction of the strip steel, and the S shape defects are obviously different from the existing known wave shape defects such as various single-side waves, middle waves and the like, so the S shape middle wave plate shape defects are named as the S shape middle wave plate shape defects in the industry according to the extension distribution characteristics of the type of asymmetric plate shape defects on the plate shape stress cloud chart. At present, no related prevention and control method aiming at the plate-shaped defects exists in the industry.
The method for controlling the double-side wave and middle wave plate shapes of the five-rack cold continuous rolling high-strength steel plate strip, namely CN201811233342.2, is retrieved, the disclosed technology and the scheme both relate to the field of cold rolling plate shape control, but the disclosed technology is mainly based on the comparison of a calculated value and an actual measured value of the double-side wave or middle wave plate shapes at the outlet of the ith rack, and the correction value of the bending force of the working roll and the middle roll of the ith-2 rack is calculated and corrected, so that the double-side wave or middle wave plate shapes at the outlet of the ith rack meet the quality requirement. The disclosed technology mainly aims at the defects of double-side waves and medium waves of a five-stand cold continuous rolling high-strength steel plate, and the scheme mainly aims at solving the defect that when a working roll of a fifth stand is replaced in the production process of the ultrathin T5 material, an alternative asymmetric bubble-shaped S-shaped medium wave plate shape is generated on the strip steel after the roll replacement is finished, and the two technical schemes are completely different in specific problems and specific contents and do not have any technical inspiration.
Disclosure of Invention
The invention provides a method for preventing and controlling S-shaped middle wave defects of ultrathin T5 materials aiming at the problems in the prior art, the technical scheme is based on the generation reason of the S-shaped middle wave plate defects through comparative analysis, the method for preventing and controlling the S-shaped middle wave defects of the ultrathin T5 materials is provided, the method reduces the S-shaped middle wave plate defects through optimizing the control model of the existing rolling mill, and the using effect is obvious.
In order to achieve the purpose, the technical scheme of the invention is that the method for preventing and controlling the S-shaped middle wave defect of the ultrathin T5 material comprises the following steps:
s1: the parameter of the control model is adjusted and set,
s2 process data acquisition is tracked,
s3: the control of the downward inclination is optimized,
s4: and (5) roll bending control optimization.
As a modification of the present invention, the step S1: the parameter adjustment and setting of the control model are specifically as follows, because the deformation resistance of the ultrathin T5 material is large, the friction coefficient required in the rolling process is small, and the lubricating state is good, so the parameter setting value of the process control model is adjusted before the first roll rolling of the ultrathin T5 material after the roll changing of the working roll 11 of the fifth rack 7 is completed, and the parameter adjustment and setting method comprises the following steps: the concentration of the emulsion is improved to the upper limit of the required range by 4.5 percent; the tension value of four or five frames is increased to 1-3mN/m, the roughness of 5 frame working rolls is 0.45-0.5um, and the service distance of 5 frame intermediate rolls is less than 100 km.
As an improvement of the invention, the process data tracking and collecting S2 includes that in the first roll rolling process of the ultrathin T5 material after the roll change of the working roll 11 of the fifth rack 7 is finished, the production line process control computer tracks and collects relevant process data and parameters on line and in real time, wherein the relevant process data and parameters include the average value and the set value of the real-time rolling force of each rack 7; average of forward slip values
(ii) a And detecting stress cloud chart data of the plate shape and the like.
As an improvement of the present invention, the S3: optimization of depressing and inclining control, selection of solving control strategy and dynamic weighting adjustment according to the actual measurement plate shape condition, setting by a computer plate shape process control system according to a quartic orthogonal polynomial mode, the sign discrimination is carried out on the coefficients of the cubic mode and the primary mode, when the two coefficients are reversed and the absolute values are close to each other, the threshold value of the absolute value ratio of the two coefficients is set (the ratio of the absolute values is between 0.5 and 1), the weight of the first solving control strategy is set to be 1, and the first solving control strategy is selected to be used, in the process, and when the rolling force of the fifth rack of the first roll changing of the T5 material exceeds 70% of the set value, and under the conditions that the shape deviation is once continuously for 25 times, the mode coefficients of three times are opposite and the change trends are also opposite, the inclination value in the shape process control system alarms, and an operator turns off the pressing inclination control in the shape control system.
As a modification of the present invention, the step S4: and (3) roll bending control optimization, namely, selecting a solution control strategy or dynamically weighting and adjusting the solution control strategy according to an actually measured plate shape mode by adopting an equal-step-length segmented discrete search optimization solution strategy in an adjustable range of a working roll bending roll and a middle roll bending roll. Setting a threshold value according to the coefficient ratio of the secondary mode and the quaternary mode, and setting the weight of the first solving control strategy to be 1 when the coefficient ratio of the secondary mode and the quaternary mode exceeds 5, namely using the first solving control strategy to quickly eliminate the Zhonglang; in the process, according to the actual shape mode, the dynamic adjustment of the distribution coefficients of the working roll bending roll and the intermediate roll bending roll is carried out; when the rolling force of the fifth rack of the first roll change of the T5 material exceeds 70% of the set value, and the plate shape deviation is carried out for 25 times continuously, the coefficients of the three modes are opposite and the variation trend is also opposite, the operator reduces the bending value of the bending roll by 3-5KN in the plate shape control system under the condition of turning off the inclination control of the press, controls the edge wave trend, and effectively utilizes the shifting roll to carry out S-shaped middle wave control by matching with the online roll shape.
Compared with the prior art, the invention has the advantages that 1) the technical scheme can be used for carrying out system optimization of rolling mill reduction inclination control, roller bending control, roller stringing control and tension control according to the actual measured plate shape condition and by combining with the special characteristics of the S-shaped middle wave plate shape defect, so that when the cold continuous rolling mill rolls an extremely thin T5 material, the rapid and active prevention control of the alternative asymmetric S-shaped middle wave plate shape defect generated on the rolled strip steel after the roll change of the fifth rack working roll is completed is realized, the S-shaped middle wave plate shape defect rate produced by the first extremely thin T5 material is reduced from 87% to 19%, the product yield of the T5 material is effectively improved, the generation of waste and defective products is reduced, the energy conservation and environmental protection are facilitated, and the economic benefit is considerable; 2) the control model data that this scheme needs to gather and adjust are the normal real-time process data of production line, and the collection of relevant data is judged, the adjustment process is convenient, need not additionally to increase data acquisition equipment, can accomplish through production line process control computer and gather and data operation and judge, has the characteristics of quick implementation.
Drawings
FIG. 1 is a schematic process diagram of a conventional five-stand rolling mill;
fig. 2 is a flow chart of the pre-control method in the scheme.
In the figure: 1-strip steel, 2-tension roller, 3-NO1 rack, 4-NO2 rack, 5-NO3 rack, 6-NO4 rack, 7-NO5 rack, 8-coiling machine, 9-supporting roller, 10-intermediate roller and 11-working roller.
The specific implementation mode is as follows:
for the purpose of enhancing an understanding of the present invention, the present embodiment will be described in detail below with reference to the accompanying drawings.
Example 1: referring to fig. 1, a method for preventing and controlling S-shaped centre wave defects of ultra-thin specification T5 materials comprises the following steps:
s1: the parameter adjustment setting of the control model is that the deformation resistance of the ultrathin T5 material is large, the friction coefficient is small in the rolling process, and the lubricating state is good, so that the parameter setting value of the control model of the process is adjusted before the first roll rolling of the ultrathin T5 material after the roll changing of the working roll 11 of the fifth rack 7 is completed, and the parameter setting value comprises the following steps: the concentration of the emulsion is improved to the upper limit of the required range by 4.5 percent; the tension value of four or five frames is increased to 1-3mN/m, the roughness of 5 frame working rolls is 0.45-0.5um, and the service distance of 5 frame intermediate rolls is less than 100 km.
S2, tracking and collecting process data, namely, tracking and collecting relevant process data and parameters on line and in real time by a production line process control computer in the first roll rolling process of the ultrathin T5 material after the roll change of the working roll 11 of the fifth rack 7 is finished, wherein the relevant process data and parameters comprise the average value and the set value of the real-time rolling force of each rack 7; average of forward slip values
And detecting stress cloud chart data of the plate shape and the like.
S3: the method comprises the steps of carrying out depressing inclination control optimization, carrying out selection and dynamic weighting adjustment of solving control strategies according to actual measurement plate shape conditions, setting a computer plate shape process control system according to a quartic orthogonal polynomial mode, carrying out sign judgment on coefficients of a cubic mode and a primary mode, setting a threshold value of absolute value ratio of the two coefficients (the ratio of the absolute values is between 0.5 and 1) when the two coefficients are reversed and the absolute values are close to each other, setting the weight of a first solving control strategy to be 1, and selecting and using the first solving control strategy. In the process, when the rolling force of the fifth rack of the first roll changing of the T5 material exceeds 70% of the set value, and under the conditions that the shape deviation is once continuously for 25 times, the coefficients of the three modes are opposite and the change trends are also opposite, the inclination value in the shape process control system gives an alarm, and an operator turns off the pressing inclination control in the shape control system.
S4: and (5) roll bending control optimization. And (3) performing equal-step-length segmented discrete search optimization solving strategy in the adjustable range of the working roll bending roll and the intermediate roll bending roll, and selecting a solving control strategy or dynamically weighting and adjusting according to the actually measured plate shape mode. Setting a threshold value according to the coefficient ratio of the quadratic and quartic modes, and setting the weight of the first solving control strategy to 1 when the coefficient ratio of the quadratic and quartic modes exceeds 5, namely, the first solving control strategy is used, and the swell is eliminated quickly. In the process, dynamic adjustment of distribution coefficients of the working roll bending roll and the intermediate roll bending roll is carried out according to the actual shape mode. When the rolling force of the fifth rack of the first roll changing of the T5 material exceeds 70% of the set value, and the plate shape deviation is carried out for 25 times continuously under the conditions that the coefficients of the three modes are opposite and the change trends are opposite, an operator turns off the pressure-down inclination control in the plate shape control system, reduces the roll bending value by 3-5KN, controls the edge wave trend, and effectively utilizes the roll shifting to carry out S-shaped middle wave control by matching with the online roll shape.
In the scheme, the forward slip value of the five stands is reduced by increasing the tension value of the fourth five stand by 1-3mN/m in the production process of the T5 material, so that the effects of reducing the rolling force and improving the defect of the S-shaped middle waves of the plate shape are achieved.
When S-shaped middle wave defects occur, the forward slip value of the 5# rack is always increased abnormally, and the forward slip value of the 4# rack is increased by 30% synchronously. According to the forward slip forming mechanism, the product is compressed in the height direction in the rolling zone, the compressed volume in the height direction flows partially longitudinally to elongate the product and form an extension, and the extension of the product is a result of the compressed metal flowing in both directions to the roll inlet and outlet. At rolling, the speed V of the rolling stock at the outlet h Greater than the peripheral speed V of the roll at that location, i.e. V h This phenomenon of > V is called forward slip. In rolling theory, the product exit velocity is usually related to the roundness of the rollThe ratio of the difference in linear speed of the peripheral speed to the linear speed of the peripheral speed of the roll is called the forward slip value, i.e.:
in the formula: s h Forward slip value
V h Velocity of rolled product at exit
V roll peripheral speed
According to the derivation of Fink, forward slip is a function of the roll radius, the outlet thickness of the rolled piece and the neutral angle, and according to the D.Dresden formula, the forward slip formula implicitly considering the influence of forward and backward tension can be simplified as follows:
according to the forward slip formula, the main factors influencing the forward slip value are as follows:
a. the larger the neutral angle is, the larger the forward slip value is;
b. the larger the diameter of the roller is, the larger the forward slip value is;
c. the smaller the thickness of the rolled piece after rolling is, the larger the forward slip value is;
d. the larger the friction coefficient μ, the larger the neutral angle, and the larger the forward slip value.
The forming mechanism of the forward slip, the classical formula of the forward slip value and the reason influencing the forward slip value are described above, the thickness of the outlet of the frame of the defective strip steel is the same as that of the normal strip steel 5, and the diameter of the roller is the same, so that the increase of the forward slip value is judged to be related to the increase of the neutral angle.
Wherein, the formula of the neutral angle is as follows:
in the formula: an alpha bite angle;
a coefficient of μ friction;
P x unit pressure;
r work roll radius;
Q 1 ，Q 0 front and rear tension acting on the rolled piece.
According to the formula, the main reason for the abnormal increase of the forward slip value is caused by the fact that the rear tension of the five frames, namely the tension set value between the fourth frame and the fifth frame is smaller or the actual value is smaller. While a secondary cause of the increase in the forward slip value is due to an increase in the coefficient of friction, which decreases rapidly with increasing oil film thickness. Therefore, the forward slip value of the five stands can be reduced by increasing the tension values of the four stands and the five stands, so that the rolling force is reduced, and the S-shaped middle wave defect is improved. And meanwhile, the concentration of the emulsion is increased to the upper limit of the required range, the thickness of an oil film and the lubricating effect of a roll gap can be effectively improved, and the friction coefficient is reduced.
Application example 1, after the working roll 11 of the fifth frame 7 is replaced, the specification is switched to T5, and the first roll of the material is rolled: steel grade DQ4151K 2; the thickness is 0.171mm, the width is 1000mm, and the total length is 11800 m. Before rolling, adjusting the parameter set value of the process control model, including increasing the concentration of the emulsion to the upper limit of the required range by 4.5%; the tension value of the four-five machine frame is increased by 3mN/m, the roughness of the working roll of the 5 machine frame is 0.46um, and the service distance of the middle roll of the 5 machine frame is less than 100 km. In the rolling process, selection and dynamic weighting adjustment of solving control strategies are carried out according to the actual measurement plate shape conditions, sign judgment is carried out according to coefficients of a cubic mode and a primary mode, when the two coefficients are reversed and the absolute values are close to each other, a threshold value of absolute value ratio of the two coefficients is set (the ratio of the absolute values is between 0.5 and 1), the weight of a first solving control strategy is set to be 1, and the first solving control strategy is selected and used. In the process, when the rolling force of the fifth rack of the first roll changing of the T5 material exceeds 1250KN and under the conditions that the plate shape deviation is once and the mode coefficients are opposite and the change trends are opposite for 25 times continuously, the screw-down inclination control is turned off.
Application example 2, after the working roll 11 of the fifth frame 7 is replaced, the specification is switched to T5 material initial roll: steel grade DQ4151K 2; the thickness is 0.17mm, the width is 835mm, and the total length is 10000 m. Before rolling, adjusting the parameter set value of a process control model, including increasing the concentration of the emulsion to the upper limit of a required range by 4.5%; the tension value of the four-five machine frame is increased to be 2mN/m, the roughness of the working roll of the 5 machine frames is 0.45um, and the service distance of the middle roll of the 5 machine frames is less than 100 km. And in the rolling process, selection of a solution control strategy or dynamic weighting adjustment is carried out according to the actually measured plate shape mode. Setting a threshold value according to the coefficient ratio of the secondary mode and the quaternary mode, and setting the weight of the first solving control strategy to be 1 when the coefficient ratio of the secondary mode and the quaternary mode exceeds 5, namely, the first solving control strategy is used, and the mesowave is eliminated quickly. In the process, dynamic adjustment of distribution coefficients of the working roll bending roll and the intermediate roll bending roll is carried out according to the actual shape mode. When the rolling force of the fifth rack of the first roll of the T5 material roll changing exceeds 1200KN, and the plate shape deviation is carried out for 25 times continuously under the conditions that the three-time mode coefficient is opposite and the change trend is opposite, the roll bending value is reduced by 3KN while the inclination control is turned off, the side wave trend is controlled, and the roll shifting is effectively utilized to carry out S-shaped middle wave control by matching with the roll shape.
It should be noted that the above-mentioned embodiments are not intended to limit the scope of the present invention, and all equivalent modifications and substitutions based on the above-mentioned technical solutions are within the scope of the present invention as defined in the claims.
Claims (2)
1. A method for preventing S-shaped middle wave defects of ultrathin T5 material is characterized by comprising the following steps:
s1, adjusting and setting the parameters of the control model,
s2 process data acquisition is tracked,
s3-pitch control optimization is pressed down,
s4, roll bending control optimization;
the step S1: adjusting and setting parameters of a control model, specifically, adjusting the parameter set values of the process control model before the first roll rolling of the ultrathin T5 material after the roll changing of the working roll (11) of the fifth rack (7), wherein the parameter set values comprise: the concentration of the emulsion is improved to the upper limit of the required range by 4.5 percent; increasing the tension value of the four-five machine frames by 1-3mN/m, the roughness of a working roll of the fifth machine frame by 0.45-0.5um, and the service distance of a middle roll of the fifth machine frame is less than 100 km;
s2, tracking and collecting process data, namely, tracking and collecting relevant process data and parameters on line and in real time by a production line process control computer in the first roll rolling process of the ultrathin T5 material after the roll change of the working roll (11) of the fifth rack (7), wherein the relevant process data and parameters comprise the average value and the set value of the real-time rolling force of each rack; average of forward slip values
(ii) a Detecting stress cloud graph data of the plate shape;
the S3: optimization of depressing and inclining control, selection of solving control strategies and dynamic weighting adjustment are carried out according to actual plate shape conditions, a computer plate shape process control system is set according to a quartic orthogonal polynomial mode, sign judgment is carried out on coefficients of a cubic mode and a primary mode, when the two coefficients are reversed and absolute values are close, a threshold value of absolute value ratio of the two coefficients is set, weight of a first solving control strategy is set to be 1, and a first solving control strategy is selected and used, in the process, when rolling force of a fifth rack of a T5 roll changing first roll exceeds 70% of a set value, and when plate shape deviation for 25 times is continuous, coefficients of the cubic mode are opposite and changing trends are also opposite, an operator alarms according to an inclining value in the plate shape process control system, and the operator turns off depressing and inclining control in the plate shape process control system, wherein in the step S4: roll bending control optimization, namely setting a threshold value according to the coefficient ratio of the secondary mode to the quartic mode, and setting the weight of a first solving control strategy to be 1 when the coefficient ratio of the secondary mode to the quartic mode exceeds 5, namely using the first solving control strategy to quickly eliminate the middle waves; in the process, according to the actual shape mode, the dynamic adjustment of the distribution coefficients of the working roll bending roll and the intermediate roll bending roll is carried out; when the rolling force of the fifth rack of the first roll changing of the T5 material exceeds 70% of the set value, and the plate shape deviation is continuously carried out for 25 times for once, the coefficients of the three modes are opposite and the change trends are opposite, an operator reduces the roll bending value by 3-5KN while turning off the pressure inclination control in the plate shape process control system, controls the edge wave trend, and effectively utilizes the roll shifting to carry out S-shaped middle wave control by matching with the online roll shape.
2. The method for controlling S-shaped crowning defects of ultrathin T5 material as claimed in claim 1, wherein the absolute value ratio of the two coefficients in step S3 is between 0.5 and 1.
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| US3934438A (en) * | 1973-05-09 | 1976-01-27 | Nippon Kokan Kabushiki Kaisha | Method of long-edge shape control for tandem rolling mill |
| CN104289524B (en) * | 2014-09-15 | 2016-03-02 | 燕山大学 | A kind of complex wave control method being suitable for four roller skin pass mill group |
| CN104492822B (en) * | 2014-10-27 | 2016-05-18 | 燕山大学 | A kind of board-shape control method of the AS-UCM type milling train that is suitable for skin pass rolling |
| CN104537136B (en) * | 2014-11-06 | 2017-08-11 | 燕山大学 | A kind of six-high cluster mill roll neck concentric reducer defect-compensating method |
| CN104525579B (en) * | 2014-12-08 | 2016-05-18 | 燕山大学 | A kind of improvement method that is suitable for four-high mill roll and is tapered defect |
| CN105290117B (en) * | 2015-09-23 | 2018-02-09 | 燕山大学 | The classification regulation and control method of the ultra-thin cold-strip steel high order flatness defect of big flakiness ratio |
| CN109226280B (en) * | 2018-10-23 | 2020-03-31 | 东北大学 | Method for controlling double-edge wave shape and medium-wave shape of five-stand cold continuous rolling high-strength steel plate strip |
| CN111112343B (en) * | 2018-10-31 | 2022-03-18 | 宝山钢铁股份有限公司 | Secondary cold-rolled plate shape control method of six-roller UCM rolling mill |
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