CN111519018B - Method and system for controlling tension of steel coil coiling parabola in continuous annealing operation line - Google Patents
Method and system for controlling tension of steel coil coiling parabola in continuous annealing operation line Download PDFInfo
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- CN111519018B CN111519018B CN202010368227.7A CN202010368227A CN111519018B CN 111519018 B CN111519018 B CN 111519018B CN 202010368227 A CN202010368227 A CN 202010368227A CN 111519018 B CN111519018 B CN 111519018B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/562—Details
- C21D9/564—Tension control
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
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Abstract
The invention provides a steel coil in a continuous annealing lineA method of coiling parabolic tension control, the method comprising: and tension control is carried out by adopting the following parabolic functions in the partial process of steel coil coiling in the continuous annealing line procedure: y is-ax2+ b; wherein y is the actual unit tension, x is the actual coil diameter, a is the set curve coefficient, and b is the set unit tension. According to the parabolic tension control method and the parabolic tension control system for coiling the steel coil in the continuous annealing operation line, the parabolic tension is adopted to control the coiling of the steel coil in the continuous annealing operation line, the coiling tension can change the tension along with the increase of the coil diameter, so that the inner ring of the steel coil is changed, and in the process of a circular furnace, even if the steel coil is influenced by high temperature for a long time, the steel coil is thermally expanded, and the steel coil cannot be extruded and deformed due to the fact that the inner ring of the steel coil has a space coefficient in an expandable range, so that the yield of the steel coil is greatly improved.
Description
Technical Field
The invention relates to the field of steel coil processing in a continuous annealing operation line, in particular to a method and a system for controlling the tension of a steel coil coiling parabola in the continuous annealing operation line.
Background
In the process of steel coil processing, after the steel coil is coiled in the continuous annealing line process, the steel coil enters the next process, the thickness of the steel coil is very thin due to specific materials, the general thickness range is 0.18-0.285mm, and the materials are particularly fragile and easy to break. At the moment, the steel coil is sealed and heated at high temperature in the annular furnace, and processes such as dehydration, desulfurization and the like are carried out. When the existing steel coil is curled in the continuous annealing line process, the coiling tension of the inner coil is unchanged, so that when the steel coil in the next process is heated at a closed high temperature in the annular furnace, the steel coil can be thermally expanded at a high temperature, the inner coil can be extruded mutually, the steel coil can be deformed seriously sometimes, the steel coil is easy to damage, the steel coil can be very troubled in the hoisting and the next process, the yield of the steel coil is seriously influenced, and the collapse of the steel coil can be possibly caused.
Disclosure of Invention
The invention aims to provide a tension control method and a tension control system for a steel coil coiling parabola in a continuous annealing operation line, and aims to solve the problem that the tension of the steel coil in the existing continuous annealing operation line is not changed when the steel coil is coiled, so that the steel coil can be thermally expanded to cause mutual extrusion of inner rings when the steel coil is heated at high temperature in the next procedure.
The invention is realized by the following steps:
in one aspect, the present invention provides a method for controlling the tension of a steel strip rolled up in a continuous annealing line, which is applied to the rolling up of a steel strip having the components of 3% to 5% of silicon, 0.06% to 0.08% of carbon, 0.15% to 0.16% of manganese, 0.02% to 0.03% of phosphorus, 0.20% to 0.25% of sulfur, 5.1% to 8, 5% of aluminum, and the balance of iron, and having a thickness in the range of 0.18 mm to 0.285mm, the method comprising: and tension control is carried out by adopting the following parabolic functions in the partial process of steel coil coiling in the continuous annealing line procedure:
y＝-ax2+b
wherein y is the actual unit tension, x is the actual coil diameter, a is the set curve coefficient, and b is the set unit tension.
Further, still include: and setting a starting roll diameter of the throwing, starting the throwing of the parabolic tension control when the actual roll diameter is equal to the set starting roll diameter of the throwing, and failing the parabolic tension control when the actual unit tension is equal to the set unit tension.
Further, if the thickness of the steel coil is within the range of 0.22-0.285mm, the curve coefficient a is set within the range of 1.4-1.5, the unit tension b is set within the range of 6.0-7.0, and the initial input coil diameter is set within the range of 700-900 mm; if the thickness of the steel coil is in the range of 0.18-0.22mm, the curve coefficient a is set in the range of 1.45-1.50, the unit tension b is set in the range of 6.0-6.5, and the initial coil diameter is set in the range of 800-1000 mm.
Further, still include: calculating the torque given of the motor according to the actual unit tension, wherein the calculation method comprises the following steps: given torque is actual unit tension and sheet width and sheet thickness and coil actual radius motor transmission ratio.
Further, still include: and PID adjustment is carried out on the given torque according to the tension fed back by a tension meter of the steel coil coiling equipment in the continuous annealing line.
On the other hand, the invention also provides a steel coil coiling parabolic tension control system in the continuous annealing operation line, which comprises a touch screen, a PLC, a frequency converter, an asynchronous motor, a gearbox and a transmission shaft which are sequentially connected, wherein the touch screen is used for setting a parabolic tension control coiling mode, a curve coefficient and unit tension, the PLC is used for calculating actual unit tension according to parabolic tension control parameters set by the touch screen, calculating corresponding torque set and then sending the corresponding torque set to the frequency converter, the frequency converter is used for controlling the asynchronous motor to work according to the torque set, and the torque of the asynchronous motor is transmitted to the transmission shaft through the gearbox.
Further, the touch screen is also used for setting the initial roll diameter of the input of the parabola tension control, the PLC is also used for controlling the input of the parabola tension control when the actual roll diameter is equal to the set input initial roll diameter, and controlling the parabola tension control to be invalid when the actual unit tension is equal to the set unit tension.
Further, the PLC is specifically configured to calculate an actual coil diameter according to a linear velocity of a tension roller set of the coil winding device in the continuous annealing line and an angular velocity of the coiler, calculate an actual unit tension according to the actual coil diameter and a set parabolic tension control parameter, and calculate a torque setting of the motor according to the actual unit tension, where the calculation method is: given torque is actual unit tension and sheet width and sheet thickness and coil actual radius motor transmission ratio.
Further, the PLC is also used for carrying out PID adjustment on the given torque according to the tension fed back by a tension meter of the steel coil coiling equipment in the continuous annealing operation line, and sending the adjusted torque to the frequency converter.
Compared with the prior art, the invention has the following beneficial effects:
according to the parabolic tension control method and the parabolic tension control system for coiling the steel coil in the continuous annealing operation line, the parabolic tension is adopted to control the coiling of the steel coil in the continuous annealing operation line, the coiling tension can change the tension along with the increase of the coil diameter, so that the inner ring of the steel coil is changed, and in the process of a circular furnace, even if the steel coil is influenced by high temperature for a long time, the steel coil is thermally expanded, and the steel coil cannot be extruded and deformed due to the fact that the inner ring of the steel coil has a space coefficient in an expandable range, so that the yield of the steel coil is greatly improved.
Drawings
FIG. 1 is a schematic diagram of a coil winding process in a continuous annealing line according to an embodiment of the present invention;
FIG. 2 is a block diagram of a tension control system for a steel coil coiling parabola in a continuous annealing line according to an embodiment of the present invention;
fig. 3 is a graph comparing a parabolic curve with a constant tension curve.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
FIG. 1 is a schematic view of a process for coiling a steel coil in a continuous annealing line, wherein BR (BRIDE roll) is a tension roll set, TM (TensionMeasure) is a tension meter, PR (Pinchroll) is a steering pinch roll, and TR is a (Tensionroll) coiler.
The embodiment of the invention provides a tension control method for a steel coil coiling parabola in a continuous annealing operation line, which is applied to coiling a steel strip which comprises the components of 3-5% of silicon, 0.06-0.08% of carbon, 0.15-0.16% of manganese, 0.02-0.03% of phosphorus, 0.20-0.25% of sulfur, 5.1-8, 5% of aluminum and the balance of iron, wherein the thickness range of the steel strip is within 0.18-0.285mm, the steel strip under the condition is easy to break, thin and crisp and is easy to thermally expand, and the method comprises the following steps: and tension control is carried out by adopting the following parabolic functions in the partial process of steel coil coiling in the continuous annealing line procedure:
y＝-ax2+b
wherein y is the actual unit tension, x is the actual coil diameter, a is the set curve coefficient, b is the set unit tension, which is a coefficient, and y is subjected to amplitude limiting treatment.
The invention adopts parabolic tension to control the coiling of the steel coil in the continuous annealing operation line, the coiling tension can change the tension along with the increase of the coil diameter, so that the inner ring of the steel coil is changed, and in the process of the annular furnace, even if the steel coil is influenced by high temperature for a long time, the steel coil is thermally expanded, and the steel coil cannot be extruded and deformed due to the space coefficient of the inner ring of the steel coil in an expandable range, thereby greatly improving the yield of the steel coil.
Optimizing the method, further comprising: and setting a starting roll diameter of the input, starting the tension control of the input parabola when the actual roll diameter is equal to the set starting roll diameter of the input, controlling a tension curve by a parabola curve along with the increase of the roll diameter, and failing the tension control of the parabola when the actual unit tension is equal to the set unit tension, otherwise, adopting the conventional constant tension control. Therefore, when the steel coil is coiled to a certain degree by constant tension control, the parabolic tension control is started to be input, the tension is gradually reduced in a parabolic mode, when the tension is reduced to the certain degree, the parabolic tension control is not input any more, the constant tension control is recovered, the setting is reasonable, the coiling effect is guaranteed, and the extrusion deformation of the steel coil during heating can be prevented.
Preferably, if the thickness of the steel coil is within the range of 0.22-0.285MM, the curve coefficient a is set within the range of 1.4-1.5, the unit tension b is set within the range of 6.0-7.0, the input initial coil diameter is set within the range of 700-900MM, and the quality of the steel coil generated when the maximum value of the coil diameter of the steel coil is within 1700MM is optimal; if the thickness of the steel coil is within the range of 0.18-0.22mm, the steel coil is very thin due to special materials, the curve coefficient a is set within the range of 1.45-1.50, the unit tension b is set within the range of 6.0-6.5, and the input initial coil diameter is set within the range of 800-1000mm, the maximum and minimum tension difference ratio of the steel strip coiling tension is small, the coiling quality is good, extrusion is not generated, deformation is not generated, and the surface is not damaged.
The method further comprises the following steps: calculating the torque given of the motor according to the actual unit tension, wherein the calculation method comprises the following steps: given torque is actual unit tension and sheet width and sheet thickness and coil actual radius motor transmission ratio. So that the motor works according to the given torque, and the unit tension on site is consistent with the required actual unit tension.
Preferably, the method further comprises: PID adjustment is carried out on the given torque according to the tension fed back by a tension meter of the steel coil coiling equipment in the continuous annealing line, so that the tension control is more accurate.
As shown in fig. 2, an embodiment of the present invention further provides a system for controlling tension of steel coil coiling in a continuous annealing line, the system controls tension of steel coil coiling in the continuous annealing line by using the method of the foregoing embodiment, the system includes a touch screen 1, a PLC2, a frequency converter 3, an asynchronous motor 4, a transmission case 5, and a transmission shaft 6, which are connected in sequence, the touch screen 1 is used for setting a parabolic tension control coiling mode, a curve coefficient, and a unit tension, the PLC2 is used for calculating an actual unit tension according to a parabolic tension control parameter set by the touch screen, calculating a corresponding torque setting, calculating a speed and other instructions, and then sending the speed and other instructions to the frequency converter 3 through CANBUS communication, the frequency converter 3 is used for controlling the asynchronous motor 4 to operate according to the torque setting, a motor shaft of the asynchronous motor 4 is additionally provided with an encoder, the torque of the asynchronous motor 4 is transmitted to the transmission shaft 6 through the gearbox 5, so that the coiling of the steel coil in the continuous annealing operation line is controlled according to the set parabolic tension.
Preferably, the touch screen 1 is further configured to set a starting roll diameter of the parabolic tension control, and the PLC2 is further configured to control the start of the parabolic tension control when the actual roll diameter is equal to the set starting roll diameter of the input, and control the parabolic tension control to fail when the actual unit tension is equal to the set unit tension.
The PLC2 calculates the actual unit tension according to the parabolic tension control parameter set by the touch screen 1, and calculates the corresponding torque setting specifically including: the PLC2 calculates the actual coil diameter according to the linear velocity of the tension roller group of the steel coil coiling equipment in the continuous annealing line and the angular velocity of the coiler, and the function y-ax is the function according to the actual coil diameter and the set parabola tension control parameter2+ b, calculating the actual unit tension, and calculating the torque setting of the motor according to the actual unit tension, wherein the calculation method comprises the following steps: given torque is actual unit tension and sheet width and sheet thickness and coil actual radius motor transmission ratio.
Preferably, the PLC2 is further configured to perform PID adjustment on the torque setting according to the tension fed back by the tension meter of the coil winding device in the continuous annealing line, and send the adjusted torque to the frequency converter 3, so as to improve the accuracy of control.
As shown in fig. 3, the comparison graph of the parabolic curve and the constant tension curve shows that the tension of the constant tension curve is always the same tension, the tension is always kept constant in the coiling process, the parabolic tension can change the tension along with the increase of the coil diameter, so that the inner ring of the steel coil is changed, and when the circular furnace is used for working, the steel coil is thermally expanded even if being influenced by high temperature for a long time, and the steel coil cannot be extruded and deformed due to the space coefficient of the inner ring of the steel coil in an expandable range, so that the yield of the steel coil is greatly improved. And the tension of the parabola is more smooth on controlling the coiling of the steel coil and the coiling fluctuation is smaller relative to convex curve control or taper tension control.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. A parabolic tension control method for coiling a steel strip in a continuous annealing operation line, which is applied to coiling the steel strip with the components of 3% -5% of silicon, 0.06% -0.08% of carbon, 0.15% -0.16% of manganese, 0.02% -0.03% of phosphorus, 0.20% -0.25% of sulfur, 5.1% -8.5% of aluminum and the balance of iron and the thickness range of 0.18-0.285mm, and is characterized by comprising the following steps: and tension control is carried out by adopting the following parabolic functions in the partial process of steel coil coiling in the continuous annealing line procedure:
y＝-ax2+b
wherein y is the actual unit tension, x is the actual coil diameter, a is the set curve coefficient, and b is the set unit tension;
if the thickness of the steel coil is within the range of 0.22-0.285mm, setting the curve coefficient a within the range of 1.4-1.5 and setting the unit tension b within the range of 6.0-7.0; if the thickness of the steel coil is within the range of 0.18-0.22mm, the coefficient a of the set curve is within the range of 1.45-1.50, and the unit tension b is within the range of 6.0-6.5.
2. The method of controlling a tension of a steel coil coiling parabola in a continuous annealing line according to claim 1, further comprising: and setting a starting roll diameter of the throwing, starting the throwing of the parabola tension control when the actual roll diameter is equal to the set starting roll diameter of the throwing, and failing the parabola tension control when the actual unit tension is equal to the set unit tension.
3. The method of controlling the tension of a steel coil coiling parabola in a continuous annealing line according to claim 2, wherein: if the thickness of the steel coil is within the range of 0.22-0.285mm, setting the initial coil diameter to be within the range of 700-; if the thickness of the steel coil is within the range of 0.18-0.22mm, the initial coil diameter is set within the range of 800-.
4. The method of controlling a tension of a steel coil coiling parabola in a continuous annealing line according to claim 1, further comprising: calculating the torque given of the motor according to the actual unit tension, wherein the calculation method comprises the following steps: given torque is actual unit tension and sheet width and sheet thickness and coil actual radius motor transmission ratio.
5. The method of controlling the parabolic tension of a coil in a continuous annealing line according to claim 4, further comprising: and PID adjustment is carried out on the given torque according to the tension fed back by a tension meter of the steel coil coiling equipment in the continuous annealing line.
6. The utility model provides a parabola tension control system is got to coil of strip in continuous annealing operation line which characterized in that: the device comprises a touch screen, a PLC (programmable logic controller), a frequency converter, an asynchronous motor, a gearbox and a transmission shaft which are sequentially connected, wherein the touch screen is used for setting a parabolic tension control coiling mode, a curve coefficient and unit tension, the PLC is used for controlling parameters according to the parabolic tension set by the touch screen, namely a parabolic function y is-ax2+ b, calculating the actual unit tension, calculating a corresponding torque set, and sending the torque set to the frequency converter, wherein the frequency converter is used for controlling the asynchronous motor to work according to the torque set, and the torque of the asynchronous motor is transmitted to the transmission shaft through the gearbox;
if the thickness of the steel coil is within the range of 0.22-0.285mm, setting the curve coefficient a within the range of 1.4-1.5 and setting the unit tension b within the range of 6.0-7.0; if the thickness of the steel coil is within the range of 0.18-0.22mm, the coefficient a of the set curve is within the range of 1.45-1.50, and the unit tension b is within the range of 6.0-6.5.
7. The system for parabolic tension control of coil take-up in a continuous annealing line of claim 6, wherein: the touch screen is further used for setting an initial roll diameter of the input of the parabola tension control, the PLC is further used for controlling the input of the parabola tension control when the actual roll diameter is equal to the set input initial roll diameter, and controlling the parabola tension control to be invalid when the actual unit tension is equal to the set unit tension.
8. The system for parabolic tension control of coil take-up in a continuous annealing line of claim 6, wherein: the PLC is specifically used for calculating an actual coil diameter according to the linear velocity of a tension roller set of the steel coil coiling equipment in the continuous annealing operation line and the angular velocity of a coiling machine, calculating actual unit tension according to the actual coil diameter and a set parabolic tension control parameter, and calculating the torque given of a motor according to the actual unit tension, wherein the calculation method comprises the following steps: given torque is actual unit tension and sheet width and sheet thickness and coil actual radius motor transmission ratio.
9. The system for parabolic tension control of coil take-up in a continuous annealing line of claim 6, wherein: and the PLC is also used for carrying out PID adjustment on the given torque according to the tension fed back by the tension meter of the steel coil coiling equipment in the continuous annealing operation line and sending the adjusted torque to the frequency converter.
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| CN101776908B (en) * | 2010-01-02 | 2012-05-23 | 燕山大学 | Comprehensive optimization method for degreasing set coiling technique |
| CN102886383B (en) * | 2011-07-22 | 2015-03-04 | 宝山钢铁股份有限公司 | Method for controlling mechanical properties of cold-rolling strip steel in online manner |
| CN103255277B (en) * | 2013-04-28 | 2015-12-09 | 首钢京唐钢铁联合有限责任公司 | The method of wide thin IF steel is produced in continuous annealing |
| CN104289526B (en) * | 2014-09-19 | 2016-03-09 | 浙江龙盛薄板有限公司 | The cold milling wet leveling control method of single chassis reversable mill and cold rolling control system thereof |
| CN105253674B (en) * | 2015-09-28 | 2017-04-12 | 宁波市岭登电器有限公司 | Steel belt transmission device, and system and method for controlling steel belt transmission device |
| CN105404320B (en) * | 2015-11-06 | 2018-08-17 | 中冶南方（武汉）自动化有限公司 | The tension control method and system of cold rolled continuous annealing unit |
| JP6451703B2 (en) * | 2016-07-29 | 2019-01-16 | Ｊｆｅスチール株式会社 | Temper rolling method and temper rolling apparatus |
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