CN107626746B - Control system and control method for optimizing rolling thickness of aluminum foil - Google Patents
Control system and control method for optimizing rolling thickness of aluminum foil Download PDFInfo
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- CN107626746B CN107626746B CN201710820816.2A CN201710820816A CN107626746B CN 107626746 B CN107626746 B CN 107626746B CN 201710820816 A CN201710820816 A CN 201710820816A CN 107626746 B CN107626746 B CN 107626746B
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Abstract
The invention discloses a control system for optimizing the rolling thickness of an aluminum foil. The control system comprises a hydraulic control module, an inner ring control module and an outer ring control module; the hydraulic control module comprises a hydraulic cylinder and a servo driving unit, the hydraulic cylinder is in transmission connection with the servo driving unit, and a displacement sensor and a pressure sensor are arranged on the hydraulic cylinder; the inner ring control module comprises a rolling mill stand control unit; the hydraulic control module is electrically connected with the rolling mill stand control unit; the outer ring control module comprises a thickness control unit, a thickness measuring unit, a rolling mill transmission control unit, an uncoiler transmission control unit, a coiler transmission control unit and a speed measuring unit; the thickness control unit is internally provided with an integral controller with variable gain, a Smith predictor and a compensator. The invention can greatly improve the output of the rolling mill, reduce the requirement on operators and improve the yield of products. The invention also discloses a control method for optimizing the rolling thickness of the aluminum foil.
Description
Technical Field
The invention relates to the technical field of aluminum foil production processes, in particular to a control system and a control method for optimizing the rolling thickness of an aluminum foil.
Background
Aluminum foil is a sheet directly rolled from metallic aluminum, and is used as a hot stamping material, a capacitor, a packaging material, and the like.
In the whole aluminum foil rolling process, the thickness span is very large, the influence of factors such as roller end contact and the like when different thicknesses are considered, different actuating mechanisms are adopted for thickness control of aluminum materials with different thicknesses, and when the thickness of the aluminum material is larger than 0.2mm, the thickness of the aluminum material is mainly controlled through adjusting a roll gap. As the thickness of the aluminum material decreases, the roll gap becomes insensitive to the adjustment of the thickness, and at this time, the rolling force, tension and rolling speed become the main adjusting means for controlling the thickness, and the influence of the rolling force, tension and rolling speed on the rolling thickness varies as shown in fig. 1.
Because the thickness of the aluminum foil is small, the rolling mill generally works in a rolling force mode, and as can be seen from fig. 1, after the thickness of the product at the outlet is less than 0.1mm, the influence of the rolling force is gradually weakened, and the influence of the tension and the rolling speed on the thickness is more obvious, so that the optimized tension and speed become a main thickness control adjusting means of the aluminum foil, which plays a crucial role in the yield of the aluminum foil product.
Disclosure of Invention
According to one aspect of the invention, a control system for optimizing the rolling thickness of an aluminum foil is provided, and comprises a hydraulic control module, an inner ring control module and an outer ring control module;
the hydraulic control module is electrically connected with the outer ring control module through the inner ring control module;
the hydraulic control module comprises a hydraulic cylinder and a servo driving unit, the hydraulic cylinder is in transmission connection with the servo driving unit, a displacement sensor and a pressure sensor are arranged on the hydraulic cylinder, the displacement sensor can measure the displacement of the hydraulic cylinder, and the pressure sensor can measure the pressure of the hydraulic cylinder;
the inner ring control module comprises a rolling mill stand control unit;
the hydraulic control module is electrically connected with the rolling mill stand control unit;
the outer ring control module comprises a thickness control unit, a thickness measuring unit, a rolling mill transmission control unit, an uncoiler transmission control unit, a coiler transmission control unit and a speed measuring unit;
the thickness control unit and the thickness measuring unit are electrically connected with the rolling mill stand control unit;
the thickness measuring unit, the rolling mill transmission control unit, the uncoiler transmission control unit, the coiler transmission control unit and the speed measuring unit are all electrically connected with the thickness control unit;
the analog input part of the thickness control unit is connected to the displacement sensor, the pressure sensor, the speed measurement unit and the thickness measurement unit, and the analog output part of the thickness control unit is connected to the uncoiler transmission control unit, the coiler transmission control unit, the rolling mill transmission control unit and the servo drive unit;
the thickness control unit is internally provided with an integral controller with variable gain, a Smith predictor and a compensator.
The invention has the beneficial effects that: the control system for optimizing the rolling thickness of the aluminum foil can make full use of the adjustment of speed and tension in the starting stage of the rolling mill, so that the strip material enters the target thickness as early as possible. Because the thickness control unit in the invention can transmit the adjustment quantity of the acceleration to the rolling mill transmission control unit through the analog quantity, compared with the traditional thickness control system, the communication speed is accelerated, the following performance of the speed is improved, the speed can be completed within 55 seconds from the threading speed to the normal production speed of 900 m/min, and the traditional inching acceleration method generally needs more than 3 minutes to reach the production speed on the premise of skilled operation, thereby being obvious that the rolling time can be saved by the control system compared with the traditional control system. In addition, the conventional tension adjustment is controlled by an open loop, a system calculates a torque amplitude limit value according to given tension and sends the torque amplitude limit value to a rolling mill transmission control unit, and the tension in the production process is far away from the target tension due to inaccurate calculation of the rolling mill transmission control unit. The control system adopts closed-loop control to adjust the tension, and the system calculates the tension through the actual torque of the motor, so that new adjustment can be made in real time to keep the tension stable. Therefore, the control system provided by the invention has a remarkable improvement effect on a mode of controlling the thickness through tension and speed in the aluminum foil rolling process.
In some embodiments, the compensator comprises a dynamic compensator and a static compensator, wherein the dynamic compensator can ensure the speed precision and the tension stability by correcting the load of a motor according to a calculation equation of the actual moment of inertia in the speed-up stage of the rolling mill; the static compensator can guarantee the tension to be stable through the load of the fine tuning motor according to the variation of the friction curve and the coil diameter in the speed stabilizing stage of the rolling mill. Therefore, the dynamic compensation algorithm of the dynamic compensator and the static compensation algorithm of the static compensator can correspondingly compensate the transmission device of the uncoiler and the transmission device of the coiler at different rolling speeds so as to maintain the stability of the tension and the speed and improve the yield of the aluminum foil. In addition, by adopting the control system, the requirement on operators can be greatly reduced, and the system can automatically adjust the plate type and the thickness difference during the speed-up period of the rolling mill, so that the quality of products is not influenced by the proficiency of operators.
In some embodiments, the outer ring control module further comprises a tension measuring unit disposed at an outlet side of the rolling mill, the tension measuring unit being electrically connected to the thickness control unit, the analog input portion of the thickness control unit being further connected to the tension measuring unit. Thus, the actual tension can be measured by the tension measuring device, and the thickness control unit can control the tension by using the actual tension as a reference.
Further, the tension measuring unit is a plate type roller, so that the tension measurement can be facilitated, and the tension measurement accuracy can be improved.
The invention also provides a control method for optimizing the rolling thickness of the aluminum foil based on the control system, which comprises the following steps:
the thickness measuring unit measures the thickness of the aluminum foil at the outlet of the rolling mill, and the thickness control unit calculates the thickness deviation at the outlet of the rolling mill according to the thickness of the aluminum foil at the outlet of the rolling mill;
the variable gain integral controller and the Smith predictor calculate the regulating quantity of the additional rolling force and the regulating quantity of the acceleration of the rolling mill according to the thickness deviation, the thickness control unit transmits the regulating quantity of the additional rolling force to the servo driving unit through analog quantity, the servo driving unit controls the movement of the hydraulic cylinder, and the thickness control unit transmits the regulating quantity of the acceleration to the rolling mill transmission control unit through analog quantity so as to adjust the rolling speed of the rolling mill;
the compensator obtains the compensation result of the tension through a compensation algorithm according to the adjustment quantity of the acceleration, and the thickness control unit transmits the compensation result to the uncoiler transmission control unit and the coiler transmission control unit through analog quantity so as to maintain the stability of the tension.
The control method for optimizing the rolling thickness of the aluminum foil can effectively improve the production efficiency of the rolling mill and greatly improve the yield of products.
In some embodiments, the compensation algorithm comprises a dynamic compensation algorithm and a static compensation algorithm, and the load of the motor is corrected through the dynamic compensation algorithm according to a calculation equation of the actual moment of inertia in the speed-up stage of the rolling mill, so that the stability of the speed and the tension is ensured; and in the speed stabilizing stage of the rolling mill, the load of the motor is finely adjusted through a static compensation algorithm according to the variation of the friction force curve and the coil diameter, so that the stability of the tension is ensured. Therefore, under different rolling speeds, the transmission device of the uncoiler and the transmission device of the coiler are correspondingly compensated so as to maintain the stability of the tension and the rolling speed.
In some embodiments, the method further comprises detecting the actual tension in real time by a tension measuring unit disposed at an outlet side of the rolling mill, and the thickness control unit performs the control of the tension with reference to the actual tension detected by the tension measuring unit. Therefore, the stability of the tension can be greatly improved, and the yield of the product is improved.
Drawings
FIG. 1 is a schematic representation of the variation of the influence of rolling force, tension and rolling speed on the thickness of the product outlet;
fig. 2 is a block diagram schematically illustrating the structure of a control system for optimizing the rolling thickness of an aluminum foil according to an embodiment of the present invention;
fig. 3 is a flowchart of a control method for optimizing the rolling thickness of an aluminum foil according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings.
Fig. 1 schematically shows the variation of the influence of rolling force, tension and rolling speed on the outlet thickness of the product, as shown in fig. 1, when the outlet thickness of the aluminum material is less than 0.1mm, the influence of the rolling force on the thickness is gradually weakened, and the influence of the tension and the rolling speed on the thickness is more obvious.
Fig. 2 schematically shows a control system for optimizing the rolling thickness of an aluminum foil according to an embodiment of the present invention, and as shown in fig. 2, the control system includes a hydraulic control module 1, an inner ring control module 2, and an outer ring control module 3, and the hydraulic control module 1 is electrically connected to the outer ring control module 3 through the inner ring control module 2.
The inner ring control module 2 comprises a rolling stand control unit 21, the hydraulic control module 1 is electrically connected with the rolling stand control unit 21, the hydraulic control module 1 comprises a hydraulic cylinder 11 and a servo driving unit 12, the hydraulic cylinder 11 is in transmission connection with the servo driving unit 12, the servo driving unit 12 can control the movement of the hydraulic cylinder 11, a displacement sensor 13 and a pressure sensor 14 are arranged on the hydraulic cylinder 11, the displacement sensor 13 can measure the displacement of the hydraulic cylinder 11, and the pressure sensor 14 can be adjusted to measure the pressure of the hydraulic cylinder 11.
The outer ring control module 3 includes a thickness control unit 31, a thickness measurement unit 32, a rolling mill drive control unit 33, an uncoiler drive control unit 34, a coiler drive control unit 35, and a speed measurement unit 36. The rolling mill drive control unit 33 is mainly used for controlling the drive device of the rolling mill, the uncoiler drive control unit 34 is mainly used for controlling the drive device of the uncoiler, and the coiler drive control unit 35 is mainly used for controlling the drive device of the coiler. The rolling speed and the rotational speeds of the unwinder and the coiler can be measured by the speed measuring unit 36. Therefore, the control system provided by the invention can calculate the tension through the actual torque of the motor, so that new adjustment can be made in real time to keep the tension stable.
The thickness measuring unit 32, the rolling mill transmission control unit 33, the uncoiler transmission control unit 34, the coiler transmission control unit 35 and the speed measuring unit 36 are all electrically connected with the thickness control unit 31.
The thickness control unit 31 and the thickness measuring unit 32 are both electrically connected to the mill stand control unit 21, and the outlet thickness of the product can be measured by the thickness measuring unit 32.
An analog input part of the thickness control unit 31 is connected to the displacement sensor 13, the pressure sensor 14, the speed measuring unit 36 and the thickness measuring unit 32, and an analog output part of the thickness control unit 31 is connected to the uncoiler drive control unit 34, the coiler drive control unit 35, the rolling mill drive control unit 33 and the servo drive unit 12. Therefore, through analog quantity input and output, the communication speed can be greatly improved, and the following performance of tension and speed is enhanced.
The thickness control unit 31 is provided with an integral controller 311 with variable gain, a Smith predictor 312 and a compensator 313. Thus, the adjustment amount of the additional rolling force and the adjustment amount of the acceleration of the rolling mill are calculated according to the thickness deviation by the variable gain integral controller 311 and the Smith predictor 312, and the tension is compensated by the compensator 313, so that the stability of the tension and the speed is maintained.
Preferably, the compensator 313 comprises a dynamic compensator 3131 and a static compensator 3132, the dynamic compensator 3131 is capable of adding optimization of system logic under different rolling conditions according to a calculation equation of actual moment of inertia and an algorithm based on additional torque, acceleration and inertia in the acceleration stage of the rolling mill, and the speed precision and tension stability are ensured by correcting the load of the motor; the static compensator 3132 can select different friction forces for different speeds according to the variation of the friction force curve and the coil diameter at the speed stabilizing stage of the rolling mill, and the tension stability is ensured by fine tuning the load of the motor. Therefore, the dynamic compensation algorithm of the dynamic compensator 3131 and the static compensation algorithm of the static compensator 3132 can compensate the transmission of the uncoiler and the transmission of the coiler at different rolling speeds, so as to maintain the stability of the tension and the speed and improve the yield of the aluminum foil. In addition, by adopting the control system, the requirement on operators can be greatly reduced, and the system can automatically adjust the plate type and the thickness difference during the speed-up period of the rolling mill, so that the quality of products is not influenced by the proficiency of operators.
In order to improve the control effect on the tension, the outer ring control module 3 further includes a tension measuring unit 37, the tension measuring unit 37 is disposed at the outlet side of the rolling mill, the tension measuring unit 37 is electrically connected to the thickness control unit 31, and the analog input part of the thickness control unit 31 is further connected to the tension measuring unit 37. Thus, the actual tension can be measured by the tension measuring device, and the thickness control unit 31 can control the tension with the actual tension as a reference.
The tension measuring unit 37 may be a plate type roller, whereby the measurement of tension may be facilitated and the measurement accuracy of tension may be improved.
Fig. 3 schematically shows a control method for the rolling thickness optimization of an aluminum foil according to an embodiment of the present invention, as shown in fig. 3, the control method includes the steps of:
step S01, the thickness measuring unit 32 measures the thickness of the aluminum foil at the outlet of the rolling mill, and the thickness control unit 31 calculates the thickness deviation at the outlet of the rolling mill according to the thickness of the aluminum foil at the outlet of the rolling mill.
Step S02, the variable gain integral controller 311 and the Smith predictor 312 calculate the adjustment amount of the additional rolling force and the adjustment amount of the acceleration of the rolling mill according to the thickness deviation, the thickness control unit 31 transmits the adjustment amount of the additional rolling force to the servo drive unit 12 through an analog quantity, the servo drive unit 12 controls the movement of the hydraulic cylinder 11, and the thickness control unit 31 transmits the adjustment amount of the acceleration to the rolling mill transmission control unit 33 through an analog quantity to adjust the rolling speed of the rolling mill.
Preferably, the compensation algorithm comprises a dynamic compensation algorithm and a static compensation algorithm, and the load of the motor is corrected through the dynamic compensation algorithm according to a calculation equation of the actual moment of inertia in the speed-up stage of the rolling mill, so that the stability of the speed and the tension is ensured; and in the speed stabilizing stage of the rolling mill, the load of the motor is finely adjusted through a static compensation algorithm according to the variation of the friction force curve and the coil diameter, so that the stability of the tension is ensured. Therefore, under different rolling speeds, the transmission device of the uncoiler and the transmission device of the coiler are correspondingly compensated so as to maintain the stability of the tension and the rolling speed.
In step S03, the compensator 313 obtains the compensation result of the tension by the compensation algorithm according to the adjustment amount of the acceleration, and the thickness control unit 31 transmits the compensation result to the uncoiler drive control unit 34 and the coiler drive control unit 35 by analog quantity to maintain the tension stable.
Further, the method further includes detecting the actual tension in real time by a tension measuring unit 37 disposed at an outlet side of the rolling mill, and the thickness control unit 31 performs the tension control with reference to the actual tension detected by the tension measuring unit 37. Therefore, the stability of the tension can be greatly improved, and the yield of the product is improved.
Therefore, by adopting the control method provided by the invention, the adjustment of speed and tension can be fully utilized in the starting stage of the rolling mill, so that the strip enters the target thickness as soon as possible, the strip is continuously accelerated to the preset target thickness on the premise of keeping the thickness difference and the stable plate shape, the strip is not accelerated and stably runs after reaching the speed point, and an operator only needs to press the running key once in the process of keeping the rolling process stably.
What has been described above are merely some embodiments of the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept herein, and it is intended to cover all such modifications and variations as fall within the scope of the invention.
Claims (1)
1. A control method for optimizing the rolling thickness of an aluminum foil uses a control system as follows: comprises a hydraulic control module (1), an inner ring control module (2) and an outer ring control module (3);
the hydraulic control module (1) is electrically connected with the outer ring control module (3) through the inner ring control module (2);
the hydraulic control module (1) comprises a hydraulic cylinder (11) and a servo driving unit (12), the hydraulic cylinder (11) is in transmission connection with the servo driving unit (12), a displacement sensor (13) and a pressure sensor (14) are arranged on the hydraulic cylinder (11), the displacement sensor (13) can measure the displacement of the hydraulic cylinder (11), and the pressure sensor (14) can measure the pressure of the hydraulic cylinder (11);
the inner ring control module (2) comprises a rolling stand control unit (21);
the hydraulic control module (1) is electrically connected with the rolling stand control unit (21);
the outer ring control module (3) comprises a thickness control unit (31), a thickness measuring unit (32), a rolling mill transmission control unit (33), an uncoiler transmission control unit (34), a coiler transmission control unit (35) and a speed measuring unit (36);
the thickness control unit (31) and the thickness measuring unit (32) are both electrically connected with the rolling stand control unit (21);
the thickness measuring unit (32), the rolling mill transmission control unit (33), the uncoiler transmission control unit (34), the coiler transmission control unit (35) and the speed measuring unit (36) are all electrically connected with the thickness control unit (31);
an analog input part of the thickness control unit (31) is connected to the displacement sensor, the pressure sensor (14), the speed measurement unit (36) and the thickness measurement unit (32), and an analog output part of the thickness control unit (31) is connected to the uncoiler transmission control unit (34), the coiler transmission control unit (35), the rolling mill transmission control unit (33) and the servo drive unit (12);
an integral controller (311) with variable gain, a Smith predictor (312) and a compensator (313) are arranged in the thickness control unit (31);
the compensator (313) comprises a dynamic compensator (3131) and a static compensator (3132), wherein the dynamic compensator (3131) can ensure the speed precision and the tension stability by correcting the load of a motor according to a calculation equation of the actual moment of inertia in the speed increasing stage of the rolling mill; the static compensator (3132) can guarantee the tension to be stable by finely adjusting the load of the motor according to the variation of a friction curve and the coil diameter in the speed stabilizing stage of the rolling mill;
the outer ring control module (3) further comprises a tension measuring unit (37), the tension measuring unit (37) is arranged on the outlet side of the rolling mill, the tension measuring unit (37) is electrically connected with the thickness control unit (31), the analog quantity input part of the thickness control unit (31) is further connected to the tension measuring unit (37), the tension measuring unit (37) is a plate type roller, and the method comprises the following steps:
the thickness of the aluminum foil at the outlet of the rolling mill is measured by a thickness measuring unit (32), and the thickness deviation at the outlet of the rolling mill is calculated by a thickness control unit (31) according to the thickness of the aluminum foil at the outlet of the rolling mill;
a variable gain integral controller (311) and a Smith predictor (312) calculate the adjustment quantity of the additional rolling force and the adjustment quantity of the acceleration of the rolling mill according to the thickness deviation, the thickness control unit (31) transmits the adjustment quantity of the additional rolling force to the servo driving unit (12) through an analog quantity, the servo driving unit (12) controls the movement of the hydraulic cylinder (11), and the thickness control unit (31) transmits the adjustment quantity of the acceleration to the rolling mill transmission control unit (33) through an analog quantity so as to adjust the rolling speed of the rolling mill;
the compensator (313) obtains a tension compensation result through a compensation algorithm according to the acceleration adjustment quantity, and the thickness control unit (31) transmits the compensation result to the uncoiler transmission control unit (34) and the coiler transmission control unit (35) through an analog quantity so as to adjust the tension;
the compensation algorithm comprises a dynamic compensation algorithm and a static compensation algorithm, and the load of the motor is corrected through the dynamic compensation algorithm according to a calculation equation of the actual moment of inertia in the speed-up stage of the rolling mill, so that the stability of the speed and the tension is ensured; in the speed stabilizing stage of the rolling mill, the load of a motor is finely adjusted through a static compensation algorithm according to the variation of a friction force curve and the coil diameter, so that the stability of tension is ensured;
the method also comprises the steps that the actual tension is detected in real time through a tension measuring unit (37) arranged on the outlet side of the rolling mill, and the thickness control unit (31) controls the tension by taking the actual tension detected by the tension measuring unit (37) as a reference;
the process is completed in 55 seconds from the threading speed to the normal production speed of 900 m/min.
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| CN108655180B (en) * | 2018-04-27 | 2019-07-16 | 北京科技大学 | A kind of compensation method that hot rolled aluminium is thinned with boosting velocity procedure thickness |
| CN109482655A (en) * | 2018-11-08 | 2019-03-19 | 河南万达铝业有限公司 | The method that second control system transformation is carried out to old milling train |
| CN113172095A (en) * | 2021-03-11 | 2021-07-27 | 普锐特冶金技术(中国)有限公司 | Method and device for controlling rolling system and rolling process control system |
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| JP4988171B2 (en) * | 2005-06-23 | 2012-08-01 | 株式会社日立製作所 | Rolling mill control device |
| CN100525943C (en) * | 2007-01-09 | 2009-08-12 | 东北大学 | Ratio control hydraulic pressure system for implementing belt steel rolling constant-tension control |
| CN101229562A (en) * | 2008-02-14 | 2008-07-30 | 镇江市宏业科技有限公司 | Aluminum foil thickness automatic control system |
| JP6173898B2 (en) * | 2013-12-10 | 2017-08-02 | 株式会社日立製作所 | Rolling control device, rolling control method, and rolling control program |
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