CN110355215B - Strip edge plate type control method and system based on induction heating - Google Patents
Strip edge plate type control method and system based on induction heating Download PDFInfo
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- CN110355215B CN110355215B CN201910457052.4A CN201910457052A CN110355215B CN 110355215 B CN110355215 B CN 110355215B CN 201910457052 A CN201910457052 A CN 201910457052A CN 110355215 B CN110355215 B CN 110355215B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/06—Lubricating, cooling or heating rolls
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
- B21B37/30—Control of flatness or profile during rolling of strip, sheets or plates using roll camber control
- B21B37/32—Control of flatness or profile during rolling of strip, sheets or plates using roll camber control by cooling, heating or lubricating the rolls
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
- B21B38/006—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
- B21B38/02—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring flatness or profile of strips
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2267/00—Roll parameters
- B21B2267/12—Roll temperature
Abstract
The application discloses strip edge plate type control method and system based on induction heating, a plate type control ring and a temperature control ring are respectively used for adjusting in a double-closed-loop control loop mode, and compared with a traditional single-closed-loop control loop, the strip edge plate type control method and system based on induction heating are short in debugging time, high in control precision and strong in anti-interference capacity. And through the plate type control ring, the plate type deviation is calculated by the controller and then is output to the temperature control ring as a temperature set value. In the temperature control ring, the temperature rise of the working roll can be directly controlled by measuring the temperature of the working roll, so that the thermal expansion of the working roll is controlled, the rolling reduction of the edge of the working roll is changed, and finally the improvement of the edge plate type of the strip material is realized.
Description
Technical Field
The application relates to a strip edge plate shape control method and system based on induction heating, in particular to a plate shape control method and system in a non-ferrous metal rolling process, and belongs to the technical field of non-ferrous metal processing control.
Background
In the rolling process of nonferrous metals, the plate shape index belongs to one of the most key quality indexes. The quality of the plate shape of the nonferrous metal strip product directly influences the product quality and the yield and also influences the production efficiency of the product. There has been continued attention and research directed to measures for improving the sheet profile quality of non-ferrous metal strip, including sheet and strip foil products.
In the rolling process of nonferrous metals, such as four-high rolling mill, the adjustment of the plate shape is generally carried out by bending rolls, tilting work rolls, cooling work rolls and the like to obtain the desired plate shape, and the transverse movement of intermediate rolls is also included in six-high rolling mill and multi-high rolling mill. These conventional methods and measures have a great improvement effect on the overall shape of the roll gap and thus on the overall profile of the sheet profile, but since the adjustment of these mechanisms mostly acts on the overall roll gap, there is a certain limitation on the local sheet profile improvement at individual locations.
For the edge position of the strip, the temperature difference exists between the contact area and the non-contact area of the strip, so that the temperature distribution of the working roll is different, the thermal expansion of the working roll is different, the transverse pressing distribution of the strip is different, the edge plate shape of the strip is poor, and the edge tightening phenomenon occurs. If the edge of the strip is too tight, the strip is easy to be cracked and even broken, and the production efficiency and the yield are influenced. In recent years, therefore, a method of improving the shape of a part, particularly the edge portion of a strip, by using an induction heating method has been developed.
In such an induction heating process, two methods are generally employed: the first is open loop control, an operator observes the edge plate shape of the strip according to naked eyes, and the power of a heating device is manually adjusted according to the observation condition; and the other is single closed loop control, the heating device is connected with the plate shape measuring system, and the power of the heating device is calculated by using the controller according to the measured feedback value of the edge plate shape.
However, both of these approaches have certain limitations. The first open-loop control method relies on manual observation and does not allow automatic adjustment. Although the second closed-loop control method realizes automatic adjustment, a single closed-loop system is adopted, as shown in fig. 1, the method depends on the feedback value of the plate shape measuring system, the dynamic change process completely depends on the plate shape feedback value, the response time is slow, and the plate shape measured value at the edge of the strip cannot completely cover the roll ring, the measurement is not complete, an algorithm is needed for compensation, so that the measured value has errors, misoperation is easily caused, and the stability is difficult to maintain in actual production. Moreover, when such controllers are field-debugged, it is difficult to obtain satisfactory controller parameters due to the constant variation of process conditions.
Disclosure of Invention
The technical problem to be solved by the application is to provide a strip edge plate type control method and system based on induction heating.
In order to solve the technical problem, the application provides a strip edge profile control method based on induction heating, which is characterized by comprising the following steps of,
(1) comparing the edge plate type target value with the edge plate type measured value to obtain a target temperature value;
(2) comparing the temperature measurement value of the position of the working roll corresponding to the edge of the strip with a target temperature value to obtain the heating power value of the induction heating device;
(3) sending the heating power value to an induction heating device for execution;
(4) and (4) repeating the steps (1) to (3) and adjusting the temperature of the working roll in real time.
Preferably, step (1) is, in particular,
(1.1) setting a target plate shape value of the edge of the strip;
(1.2) obtaining an actual strip edge plate shape measurement value from a plate shape measurement device;
(1.3) comparing the plate type target value with the plate type measured value to obtain a plate type deviation value;
(1.4) fuzzifying the plate type deviation value, and converting the plate type deviation value into a plate type deviation fuzzy variable;
(1.5) inputting the plate type deviation fuzzy variable into a plate type fuzzy controller, and obtaining a target temperature fuzzy variable after calculation of the fuzzy controller;
and (1.6) carrying out defuzzification on the target temperature fuzzy variable, and converting the target temperature fuzzy variable into a target temperature value.
Preferably, step (2) is, in particular,
(2.1) comparing the measured temperature value with a target temperature value to obtain a temperature deviation signal;
(2.2) fuzzifying the temperature deviation signal, and converting the temperature deviation signal into a temperature deviation fuzzy variable;
(2.3) inputting the temperature deviation fuzzy variable into a temperature fuzzy controller, and obtaining a heating power fuzzy variable after calculation of the fuzzy controller;
and (2.4) carrying out defuzzification treatment on the fuzzy variable of the heating power, and converting the fuzzy variable of the heating power into the heating power value.
Preferably, in the step (2), the temperature measuring device is adopted to measure the temperature of the working roll in real time to obtain a temperature measured value, the measured position of the temperature measured value is the position of the working roll corresponding to the edge of the strip material, and the measured position of the working roll is within +/-500 mm range from the edge of the strip material.
Preferably, the working rolls are upper working rolls or lower working rolls or are measured simultaneously.
The application also relates to a control system for the edge profile of a strip based on induction heating, said control system comprising,
the plate shape measuring device is used for obtaining an edge plate shape measured value of the edge of the strip;
the temperature measuring device is used for obtaining the temperature measuring value of the position of the working roll corresponding to the edge of the strip;
the plate type fuzzy controller is used for comparing the edge plate type target value with the edge plate type measured value to obtain a target temperature value;
the temperature fuzzy controller is used for comparing the temperature measurement value of the position of the working roll corresponding to the edge of the strip with a target temperature value to obtain a heating power value;
and the induction heating device is used for heating the working roller according to the heating power value.
Preferably, the temperature measuring device is an infrared thermometer or a thermistor or a thermal resistor.
The method and the system for controlling the edge plate shape of the strip based on induction heating have the advantages that:
(1) through the mode of two closed-loop control circuit, use board type control ring and temperature control ring respectively to adjust, compare with traditional single closed-loop control circuit, the debugging time is short, and control accuracy is high, and the interference killing feature is strong. And through the plate type control ring, the plate type deviation is calculated by the controller and then is output to the temperature control ring as a temperature set value. In the temperature control ring, the temperature rise of the working roll can be directly controlled by measuring the temperature of the working roll, so that the thermal expansion of the working roll is controlled, the rolling reduction of the edge of the working roll is changed, and finally the improvement of the edge plate type of the strip material is realized;
(2) the method for controlling the edge plate shape of the strip based on induction heating avoids the interference caused by the measurement error of the edge plate shape of the strip, realizes the automatic adjustment of the heating power, ensures the stability of the production process and improves the automation level of the production process;
(3) the strip edge plate type control method based on induction heating realizes the plate type improvement of a local area of a strip in an induction heating mode, basically does not influence the plate type distribution of other positions, is simple, effective and easy to use, and can be applied to various rolling mills of different types.
Drawings
FIG. 1 is a schematic illustration of a prior art strip edge profile control method;
FIG. 2 is a schematic illustration of a method of controlling the edge profile of a strip based on induction heating according to the present application.
FIG. 3 is a membership function of a fuzzy variable E;
fig. 4 is a membership function of the fuzzy variable T.
Detailed Description
The present application is further described below in conjunction with the following figures and specific examples to enable those skilled in the art to better understand the present application and to practice it, but the examples are not intended to limit the present application.
As shown in fig. 2, the present application provides a method for controlling the edge profile of a strip based on induction heating, characterized in that the method comprises the steps of,
(1) comparing the edge plate shape target value with the edge plate shape measured value to obtain a target temperature value, wherein the step (1) is specifically,
(1.1) setting a target plate shape value of the edge of the strip;
(1.2) obtaining an actual strip edge plate shape measurement value from a plate shape measurement device;
(1.3) comparing the plate type target value with the plate type measured value to obtain a plate type deviation value;
(1.4) fuzzifying the plate type deviation value, and converting the plate type deviation value into a plate type deviation fuzzy variable;
(1.5) inputting the plate type deviation fuzzy variable into a plate type fuzzy controller, and obtaining a target temperature fuzzy variable after calculation of the fuzzy controller;
and (1.6) carrying out defuzzification on the target temperature fuzzy variable, and converting the target temperature fuzzy variable into a target temperature value.
(2) Comparing the temperature measurement value of the position of the working roll corresponding to the edge of the strip with a target temperature value to obtain the heating power value of the induction heating device, wherein the step (2) is specifically,
(2.1) comparing the measured temperature value with a target temperature value to obtain a temperature deviation signal;
(2.2) fuzzifying the temperature deviation signal, and converting the temperature deviation signal into a temperature deviation fuzzy variable;
(2.3) inputting the temperature deviation fuzzy variable into a temperature fuzzy controller, and obtaining a heating power fuzzy variable after calculation of the fuzzy controller;
and (2.4) carrying out defuzzification treatment on the fuzzy variable of the heating power, and converting the fuzzy variable of the heating power into the heating power value.
(3) Sending the heating power value to an induction heating device for execution;
(4) and (4) repeating the steps (1) to (3) and adjusting the temperature of the working roll in real time.
In the step (2), the temperature of the working roll is measured in real time by a temperature measuring device to obtain a temperature measured value, the measured position of the temperature measured value is the position of the working roll corresponding to the edge of the strip, and the distance between the measured position of the working roll and the edge of the strip is within the range of +/-500 mm. The working rolls are upper working rolls or lower working rolls or upper and lower working rolls for simultaneous measurement.
In the present application, the fuzzification process and the defuzzification process both correspond to a signal conversion operation, for example, converting continuous data from 0 to 10 into three discrete numbers of-1, 0 and 1, and selecting one output from-101, for example, converting 0.5 into-1 output. The de-blurring is a similar inverse operation, for example converting-1 to 0.5 output. Besides plate-type fuzzy controllers and temperature fuzzy controllers, the controllers in the double closed-loop control loop can also take other forms such as PID controllers.
As shown in FIG. 3, the input of the plate type fuzzy controller is defined as fuzzy variable E, which represents the plate type deviation, and the output is defined as fuzzy variable T, which represents the temperature of the working roll. The argument of the fuzzy variable E is [ -2, 2], and is { big Negative (NB), small Negative (NS), zero (Z), small Positive (PS), big Positive (PB) }. The universe of argument T is [0, 2], respectively { small (S), medium (M), large (B) }. According to the actual situation, different membership functions are adopted for the input fuzzy variables. As shown in fig. 4, different membership functions are used for the output fuzzy variable T. And defining 5 fuzzy rules according to the input and output variables, and performing the defuzzification on the output variables by using a gravity center method. The fuzzy rule table is as follows:
If(E is NB)THEN(T is B)
If(E is NM)THEN(T is M)
If(E is Z)THEN(T is M)
If(E is PM)THEN(T is S)
If(E is PB)THEN(T is S)
the application also relates to a strip edge plate shape control system based on induction heating, which comprises a plate shape measuring device, a plate shape measuring device and a control device, wherein the plate shape measuring device is used for obtaining an edge plate shape measured value of the edge of the strip; the temperature measuring device is used for obtaining the temperature measuring value of the position of the working roll corresponding to the edge of the strip; the plate type fuzzy controller is used for comparing the edge plate type target value with the edge plate type measured value to obtain a target temperature value; the temperature fuzzy controller is used for comparing the temperature measurement value of the position of the working roll corresponding to the edge of the strip with a target temperature value to obtain a heating power value; and the induction heating device is used for heating the working roller according to the heating power value. The temperature measuring device is an infrared thermometer, a thermistor or a thermal resistor.
According to the method and the system for controlling the edge plate shape of the strip based on induction heating, provided by the invention, the double closed-loop control loops are used, the dynamic response performance and the control precision are improved, the temperature signal is directly measured on line in real time, the plate shape measurement error of the edge of the strip is avoided, the plate shape control performance of the edge is improved, the stability of the production process is improved, and the automatic closed-loop control loops are used, so that the production automation level is improved.
The above-described embodiments are merely preferred embodiments for fully illustrating the present application, and the scope of the present application is not limited thereto. The equivalent substitution or change made by the person skilled in the art on the basis of the present application is within the protection scope of the present application. The protection scope of this application is subject to the claims.
Claims (5)
1. A strip edge plate shape control method based on induction heating is characterized by comprising the following steps,
(1) comparing the edge plate type target value with the edge plate type measured value to obtain a target temperature value;
(2) comparing the temperature measurement value of the position of the working roll corresponding to the edge of the strip with a target temperature value to obtain the heating power value of the induction heating device;
(3) sending the heating power value to an induction heating device for execution;
(4) repeating the steps (1) to (3), and adjusting the temperature of the working roll in real time;
the concrete step (1) is that,
(1.1) setting a target plate shape value of the edge of the strip;
(1.2) obtaining an actual strip edge plate shape measurement value from a plate shape measurement device;
(1.3) comparing the plate type target value with the plate type measured value to obtain a plate type deviation value;
(1.4) fuzzifying the plate type deviation value, and converting the plate type deviation value into a plate type deviation fuzzy variable;
(1.5) inputting the plate type deviation fuzzy variable into a plate type fuzzy controller, and obtaining a target temperature fuzzy variable after calculation of the fuzzy controller;
(1.6) carrying out defuzzification on the target temperature fuzzy variable to convert the target temperature fuzzy variable into a target temperature value;
the step (2) is specifically that,
(2.1) comparing the measured temperature value with a target temperature value to obtain a temperature deviation signal;
(2.2) fuzzifying the temperature deviation signal, and converting the temperature deviation signal into a temperature deviation fuzzy variable;
(2.3) inputting the temperature deviation fuzzy variable into a temperature fuzzy controller, and obtaining a heating power fuzzy variable after calculation of the fuzzy controller;
and (2.4) carrying out defuzzification treatment on the fuzzy variable of the heating power, and converting the fuzzy variable of the heating power into the heating power value.
2. The method of claim 1, wherein in step (2), the temperature of the work rolls is measured in real time by a temperature measuring device to obtain a temperature measurement value, the temperature measurement value is a position of the work roll corresponding to the edge of the strip, and the measurement position of the work roll is within ± 500mm from the edge of the strip.
3. A method of controlling the edge profile of a strip based on induction heating as claimed in claim 2 wherein the work rolls are upper or lower or both.
4. A control system for the edge plate shape of a strip based on induction heating is characterized by comprising,
the plate shape measuring device is used for obtaining an edge plate shape measured value of the edge of the strip;
the temperature measuring device is used for obtaining the temperature measuring value of the position of the working roll corresponding to the edge of the strip;
the plate type fuzzy controller is used for comparing the edge plate type target value with the edge plate type measured value to obtain a target temperature value;
the temperature fuzzy controller is used for comparing the temperature measurement value of the position of the working roll corresponding to the edge of the strip with a target temperature value to obtain a heating power value;
and the induction heating device is used for heating the working roller according to the heating power value.
5. An induction heating based control system of the edge panel type of a strip material as claimed in claim 4 wherein the temperature measuring means is an infrared thermometer or thermistor.
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| CN110860567A (en) * | 2019-11-27 | 2020-03-06 | 西南铝业（集团）有限责任公司 | Material temperature measuring method and device and computer readable storage medium |
| CN111589875B (en) * | 2020-03-13 | 2022-10-11 | 科芃智能科技（苏州）有限公司 | Outlet thickness gauge fault diagnosis method and system in metal rolling process |
| CN114472549B (en) * | 2020-10-26 | 2024-03-29 | 上海宝信软件股份有限公司 | System and method for controlling edge heating temperature of hot-rolled intermediate blank |
| CN114769313B (en) * | 2022-04-24 | 2024-04-05 | 中色科技股份有限公司 | Electromagnetic induction heating system for edge part of working roll of aluminum plate strip foil rolling mill and control method |
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