CN110227723B - Parameter control method for initial section of continuous annealing six-roller cold rolling temper mill - Google Patents

Parameter control method for initial section of continuous annealing six-roller cold rolling temper mill Download PDF

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Publication number
CN110227723B
CN110227723B CN201910494247.6A CN201910494247A CN110227723B CN 110227723 B CN110227723 B CN 110227723B CN 201910494247 A CN201910494247 A CN 201910494247A CN 110227723 B CN110227723 B CN 110227723B
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strip steel
rolling force
temper mill
tension
speed
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CN110227723A (en
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袁文振
王超
丁勇生
吴佳桐
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Baosteel Zhanjiang Iron and Steel Co Ltd
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Baosteel Zhanjiang Iron and Steel Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B37/00Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/56Elongation control
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B37/00Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/58Roll-force control; Roll-gap control
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B2265/00Forming parameters
    • B21B2265/18Elongation

Abstract

The invention relates to a parameter control method for an initial section of a continuous annealing six-roller cold rolling temper mill, which specifically comprises the following steps: step 1, monitoring and correcting production line tracking data; step 2, when the welding seam position of the new coiled steel strip is close to the temper mill, reducing the speed of the steel strip to 60m/min, finishing the speed regulation when the welding seam position is 0.5m away from the temper mill, keeping the speed of 60m/min, and entering the temper mill, and step 3, reducing the temper rolling force to 1100 plus 1300KN when the speed is reduced to 60m/min, so that the roll mark defect caused by overlarge impact force of the welding seam on a work roll of the temper mill is avoided, and the steel strip is ensured to stably pass through the temper mill; step 4, calculating leveling setting parameters such as rolling force, tension and the like at a position of 0.5m after the head of the strip steel passes through a leveling machine, and increasing the running speed of the strip steel to 200 m/min; and step 5, correspondingly adjusting the rolling force and the leveling tension to target values according to the strip steel information, shortening the adjusting time of the rolling force and the tension after passing through the position of the welding seam, reducing the fluctuation of the strip steel tension and the rolling force during closed-loop control of the elongation rate, and improving the yield of the strip steel.

Description

Parameter control method for initial section of continuous annealing six-roller cold rolling temper mill
Technical Field
The invention relates to the field of cold-rolled strip steel production parameter control, in particular to a parameter control method for an initial section of a continuous annealing six-roller cold-rolling temper mill.
Background
In the cold rolling continuous annealing leveling process, the joint of two coils of strip steel, namely the position near the welding seam, is a key position for leveling control. The main control parameters of the flattening process are flattening rolling force and tension before and after flattening, so the control of the elongation of the flattening machine is mainly determined by the flattening rolling force and the tension before and after flattening, wherein the rolling force of the flattening machine is a key factor for controlling the elongation precision of the flattening machine. The final performance of the strip steel product is determined by determining the elongation process parameters. If the rolling force at the position of a welding seam is too large, the roller mark defect is easily generated on the roller, and the product quality is influenced. The elongation of the strip steel is not consistent with the length and is easily increased due to the excessively small rolling force, the length of head and tail cutting is increased, and the yield of a unit is reduced. The control of the elongation of the temper mill is therefore mainly based on the accuracy of the temper rolling force.
In the prior art, the chinese patent CN104107837B controls the elongation by adjusting the running speed of the strip before the weld passes through the leveler and the rolling force after the weld passes through the leveler. The specific process is that when the welding seam of the strip steel is close to a temper mill, the speed of the strip steel is reduced to 30-70m/min, and a safety distance of more than 1m needs to be reserved after the speed reduction is finished; simultaneously, the rolling force is quickly reduced to 80-150 tons; after the welding seam passes through the temper mill, comparing the current actual measurement elongation value with the elongation target value, controlling the rolling force to be between 300 and 800 tons when the actual measurement value is larger than the target value, controlling the rolling force to be between 90 and 150 tons when the actual measurement value is smaller than the target value, and ending the step if the actual measurement value and the target value are equal; and (4) further advancing the strip steel, judging whether the current measured elongation value is close to the target elongation value in real time, if so, finishing the step, and if not, controlling the rising speed of the rolling force to be 500-1500 tons/s until the current measured value is close to the target value.
US4760723A proposes a method for controlling the elongation of a single stand rolling mill, in which the rolling force is adjusted in accordance with the deviation between the measured elongation and the set elongation value, and in which the tension is compensated and controlled in accordance with the deviation between the measured rolling force and the set rolling force value in order to eliminate the influence of the adjustment of the rolling force on the tension. The theory and practice of cold rolling of the strip show that in the process of flat rolling of the strip steel, the rolling force and the tension are coupled with each other, the tension fluctuation is often caused by the change of the rolling force, and on the contrary, the rolling force fluctuation is also caused by the change of the tension.
In the current production process, as described in the above patent, the technology of adjusting the rolling force according to the target elongation is mature, the existing problems are mainly focused on the initial process setting of the welding seam position on the position of the leveler, so-called initial process mainly includes the front and rear tension and the rolling force parameter of the leveler, the leveling rolling force needs to be matched with the leveling tension, when the initial parameter of the rolling force is too low or too high, the time for adjusting the rolling force to the target elongation is obviously increased, thus the longer distance of the head of the steel coil cannot meet the product quality requirement, the head cutting length is increased, and the yield of the unit is reduced. Therefore, the problem of inaccurate setting of the initial process parameters of the planisher needs to be solved.
Disclosure of Invention
The invention aims to provide a parameter control method for an initial section of a continuous annealing six-roller cold rolling temper mill, which shortens the adjustment time of rolling force and tension after passing through a welding seam position by setting reasonable process parameters, reduces the fluctuation of strip steel tension, rolling force and the like during closed-loop control of elongation, and improves the yield of strip steel.
In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows:
a parameter control method for an initial section of a continuous annealing six-roller cold rolling temper mill is characterized by comprising the following steps:
step 1, monitoring and correcting production line tracking data, correcting the tracking data by using a front tension roller of a temper mill, wherein the deviation between the detection position of a tracking signal and the position of a strip steel head is less than 0.1 m;
step 2, when the welding seam position of the new coil of strip steel is close to the temper mill, reducing the speed of the strip steel to 60m/min, finishing the speed regulation when the welding seam position is 0.5m away from the temper mill, and keeping the speed of 60m/min to enter the temper mill;
step 3, when the speed is reduced to 60m/min, reducing the flattening rolling force to 1100-1300 KN;
step 4, after the strip steel welding seam passes through a leveling machine, calculating the rolling force RsLeveling tension setting parameters, and increasing the running speed of the strip steel to 200 m/min; the calculation considers three parameters of strip steel thickness t, strip steel width w and strip steel target elongation e, and the rolling force set value RsThe calculation formula of (2) is as follows:
Rs=10*(-594.9*t+0.122*w+207.5*e)(KN)
tension T before levelingfThe calculation formula is as follows:
Tf=-340*t+0.28*w+178.2*e(KN)
flat back tension TbThe calculation formula is as follows:
Tb=-340*t+0.28*w+178.2*e+100(KN)
and 5, correspondingly adjusting the rolling force and the leveling tension to target values according to the strip steel information.
Further, the pair of rolling forces R in the step 4sAnd calculating the leveling tension setting parameter, wherein the calculation is started when the distance between the position of the welding line of the strip steel and the leveling machine is 0.5m after the welding line of the strip steel passes through the leveling machine.
The technical scheme of the invention controls the elongation of the strip steel when the welding line passes through the temper mill by adjusting the rolling force and the initial parameters of the rolling force of the new steel coil after passing through the temper mill, and has the following advantages:
1. the elongation of the strip steel when the welding line passes through the leveler is quickly, accurately and effectively controlled;
2. the length of the unqualified elongation strip steel is reduced, and the utilization rate of the finished product of the strip steel is improved;
3. the implementation operation is simple and easy.
The advantageous effects of the additional features of the present invention will be explained in the detailed description section of the present specification.
Drawings
FIG. 1 is a schematic structural diagram of an over-continuous annealing six-roller cold-rolling temper mill in an embodiment of the invention;
FIG. 2 is a graph showing the fluctuation of the rolling force and elongation in the process of the old leveler;
FIG. 3 is a graph showing the fluctuation of the rolling force with respect to the elongation in the production process in the example of the present invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
The embodiment of the application provides a parameter control method of a welding line continuous annealing six-roller cold rolling temper mill, which comprises the following steps:
referring to fig. 1, for a 590CQ strip steel production process with a thickness of 1.41mm, a width of 1302mm and a target elongation of 0.7%, the distance between the weld position and the position of the leveler is tracked, the tracking data is corrected by using the front tension roller of the leveler, and the deviation between the tracking signal and the actual position of the strip steel is 0.03 m.
When the position of the welding line is close to the temper mill, the speed of the strip steel is reduced to 60m/min, and when the position of the welding line is 0.5m away from the temper mill, the speed regulation is finished and the strip steel enters the temper mill at the speed of 60 m/min.
The rolling force set value is adjusted to 1280KN while the advancing speed of the strip steel is reduced, and the defect of roll mark caused by overlarge impact force of a welding line on a working roll of the temper mill is avoided.
And calculating a target value of the rolling force and the leveling tension corresponding to the strip steel information, wherein three parameters of the strip steel thickness t, the strip steel width w and the strip steel target elongation e are considered in the calculation process. Rolling force setpoint R in this examplesThe calculation formula of (2) is as follows:
Rs=10*(-594.9*0.141+0.122*1302+207.5*0.7)=2202.131KN
tension T before levelingfThe calculation formula is as follows:
Tf=-340*0.141+0.28*1302+178.2*0.7=441.36KN
flat back tension TbThe calculation formula is as follows:
Tb=-340*0.141+0.28*1302+178.2*0.7+100=541.36KN
after the position of the welding line passes through the temper mill by 0.2 m, the running speed of the strip steel is increased to 200m/min, meanwhile, the target rolling force is adjusted to 2202.131KN (220.2131 tons), the tension before the temper rolling is adjusted to 441.36KN, and the tension after the temper rolling is adjusted to 541.36 KN.
And finally, comparing the current measured elongation value with the elongation target value, wherein the current measured elongation value is smaller than the elongation target value in the example, and the control program gradually increases the rolling force until the current measured elongation value is close to the elongation target value.
FIG. 2 is a graph showing the fluctuation of the rolling force and elongation rate in the prior temper mill production process. Referring to fig. 2, when the actual elongation of the new strip steel is reduced to 0.32% after passing through the temper mill, the rolling force needs to be increased, the rolling force in the original process is about 90 tons, the rolling force deviation corresponding to the actual elongation approaching the target elongation is large, the rolling force adjustment time is long, and the elongation generated by the old temper mill production process finally does not conform to the length of 3.08 meters (the elongation does not conform to the length is a part where the absolute value of the deviation value between the actual elongation and the target elongation is greater than 0.2%).
FIG. 3 is a fluctuation curve of rolling force and elongation corresponding to the production process of the present invention. Referring to fig. 3, after the new coiled steel passes through the temper mill, the lowest value of the actual elongation is 0.465% after the process is adopted, compared with the old production process, the minimum value is obviously improved, the process disclosed by the patent can issue about 220.2131 tons of rolling force, the deviation of the corresponding rolling force is very small when the actual elongation approaches the target elongation, the adjustment time of the rolling force is obviously shortened, and the final elongation does not conform to the length of 1.19 meters. In conclusion, the more accurate flattening process setting parameters can reduce the fluctuation adjustment time of the flattening rolling force from 2.3 seconds to 0.8 seconds, and by adopting the parameter control method, the elongation value of the welding line passing through the flattening machine is accurately controlled, the utilization rate of the strip steel material is improved, and the production input cost is saved in material and time.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.

Claims (2)

1. A parameter control method for an initial section of a continuous annealing six-roller cold rolling temper mill is characterized by comprising the following steps:
step 1, monitoring and correcting production line tracking data, correcting the tracking data by using a front tension roller of a temper mill, wherein the deviation between the detection position of a tracking signal and the position of a strip steel head is less than 0.1 m;
step 2, when the welding seam position of the new coil of strip steel is close to the temper mill, reducing the speed of the strip steel to 60m/min, finishing the speed regulation when the welding seam position is 0.5m away from the temper mill, and keeping the speed of 60m/min to enter the temper mill;
step 3, when the speed is reduced to 60m/min, reducing the flattening rolling force to 1100-1300 KN;
step (ii) of4, calculating the rolling force R after the strip steel welding seam passes through the temper millsLeveling tension setting parameters, and increasing the running speed of the strip steel to 200 m/min; the calculation considers three parameters of strip steel thickness t, strip steel width w and strip steel target elongation e, and the rolling force set value RsThe calculation formula of (2) is as follows:
Rs=10*(-594.9*t+0.122*w+207.5*e)(KN)
tension T before levelingfThe calculation formula is as follows:
Tf=-340*t+0.28*w+178.2*e(KN)
flat back tension TbThe calculation formula is as follows:
Tb=-340*t+0.28*w+178.2*e+100(KN)
and 5, correspondingly adjusting the rolling force and the leveling tension to target values according to the strip steel information.
2. The method for controlling parameters of an initial stage of a continuous annealing six-roller cold rolling temper mill according to claim 1, wherein the rolling force R in step 4 is a rolling forcesAnd calculating the leveling tension setting parameter, wherein the calculation is started when the distance between the position of the welding line of the strip steel and the leveling machine is 0.5m after the welding line of the strip steel passes through the leveling machine.
CN201910494247.6A 2019-06-09 2019-06-09 Parameter control method for initial section of continuous annealing six-roller cold rolling temper mill Active CN110227723B (en)

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JP2748831B2 (en) * 1992-09-11 1998-05-13 日本鋼管株式会社 Temper rolling method
CN101658869B (en) * 2008-08-25 2011-07-27 鞍钢股份有限公司 Technique for continuously and flatly rolling welding seams of cold-rolled sheets
CN102485364B (en) * 2010-12-01 2015-06-17 上海宝信软件股份有限公司 Tension stabilizing control method and device for leveling machine
CN102641900B (en) * 2010-12-01 2015-06-10 上海宝信软件股份有限公司 Temper mill elongation control method and control equipment
CN103252346B (en) * 2012-02-17 2015-07-22 宝山钢铁股份有限公司 Plate connecting method for improving flying gauge change rolling stability
CN104107837B (en) * 2013-04-19 2016-02-24 宝山钢铁股份有限公司 The method of accurate control cincture steel percentage elongation when weld seam crosses planisher
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