CN112718877A - Automatic optimization system and method for temper mill rolling force meter - Google Patents
Automatic optimization system and method for temper mill rolling force meter Download PDFInfo
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- CN112718877A CN112718877A CN201910973465.8A CN201910973465A CN112718877A CN 112718877 A CN112718877 A CN 112718877A CN 201910973465 A CN201910973465 A CN 201910973465A CN 112718877 A CN112718877 A CN 112718877A
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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
- B21B37/58—Roll-force control; Roll-gap control
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Abstract
The invention provides an automatic optimization system and method of a temper mill rolling force table, wherein the system comprises a PLC subsystem and a process computer subsystem; the PLC subsystem comprises a parameter acquisition module, an elongation rate control module and a PLC communication module; a parameter acquisition module: collecting actual values of rolling parameters; an elongation rate control module: controlling the elongation rate according to a preset value; a PLC communication module: the rolling parameters acquired by the parameter acquisition module are sent to a process computer subsystem; and receives the preset values sent by the process computer subsystem. The optimization control technical method can improve the rapidity and the stability of the elongation of the temper mill, reduce the length of the strip steel with inconsistent elongation when the temper mill passes a welding seam, and improve the product yield. The method can be used for reference for all planishers using cold rolling hot galvanizing and continuous annealing treatment lines similar to the cold rolling hot galvanizing treatment lines.
Description
Technical Field
The invention relates to the field of metallurgy automation, in particular to a method for automatically optimizing a rolling force meter of a temper mill.
Background
In the cold rolling of strip steel, a leveler is an important process for ensuring the product quality. The rolling force is an important parameter for controlling the temper mill, and the elongation of the strip steel can be effectively controlled by adjusting the rolling force, so that the performance of the strip steel is improved. In the prior temper mill control, the band head elongation of the strip steel has large fluctuation and the elongation does not conform to the length and is long due to the inaccuracy of the set value of the rolling force.
In a carbon steel cold rolling processing line (hot galvanizing or continuous annealing unit), a general elongation control scheme is composed of two stages of a process computer L2 and a PLC (programmable logic controller) (L1), a rolling force and an elongation set value are preset to an L1 PLC by an L2 in a table look-up mode, the PLC controls the rolling force according to an actual welding seam tracking and welding seam passing mode, and after the elongation closed-loop control is put into operation, pulse differences of tension rollers at the inlet and the outlet of a temper mill are quickly accumulated and then converted into the rolling force (different gains are set according to different steel types), so that the actual value of the elongation quickly reaches the set value. Meanwhile, in order to reduce the elongation rate fluctuation of the unit in the acceleration and deceleration process, a speed-rolling force pre-compensation curve system is added to the system so as to avoid the rolling force compensation through a PI regulator.
The problems existing at present are mainly as follows: 1. the rolling force table is inaccurate, so that the part with inconsistent actual rolling force is completely accumulated and compensated through a PI regulator, and the length with inconsistent elongation is lengthened. 2. The speed-rolling force compensation curve is determined during debugging, and the compensation curve cannot completely adapt to the control requirement along with long-time operation of a unit and local change of strip steel materials.
Some solutions to the above problem exist in the prior art, such as the elongation control system and method of the leveler disclosed in patent document CN109772899A, the method is as follows: the elongation rate feedback unit calculates the strip steel passing length L in the unit period at the inlet of the temper millEntryAnd the strip steel passing length L in the unit period at the outlet of the temper millExitAnd calculating the elongation of the temper mill and sending the elongation to a rolling force deviation feedback unit, wherein the rolling force deviation feedback unit converts the difference value of the elongation set value and the elongation feedback value into a rolling force deviation value and superposes the rolling force deviation value on the rolling force controller.
However, the technical scheme does not give out how to adjust the elongation rate of the temper mill in the dynamic process, so that the method for automatically optimizing the rolling force table has higher practical value and significance in order to ensure the stability of the elongation rate of the temper mill in the dynamic process.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an automatic optimization system and method of a rolling force table of a temper mill.
The automatic optimization system of the rolling force meter of the temper mill comprises a PLC subsystem and a process computer subsystem;
the PLC subsystem comprises a parameter acquisition module, an elongation rate control module and a PLC communication module;
a parameter acquisition module: collecting actual values of rolling parameters;
an elongation rate control module: controlling the elongation rate according to a preset value;
a PLC communication module: the rolling parameters acquired by the parameter acquisition module are sent to a process computer subsystem; and receives the preset values sent by the process computer subsystem.
Preferably, the rolling parameters include any one or any combination of rolling force, elongation, current unit speed, current strip width thickness and temper mill front-rear tension.
Preferably, the process computer subsystem includes a neural network module;
the neural network module comprises an input layer and an output layer;
the input layer comprises any one or any combination of seven of unit speed, strip steel grade, strip steel width, strip steel thickness, the actual value of front and rear tension of the temper mill and the actual value of elongation; the data source of the input layer is rolling parameters sent by the PLC subsystem;
the output layer comprises any one or any combination of five of an elongation set value, a rolling force set value, a speed-rolling force compensation value and a front-back tension set value; and the data obtained by the output layer is sent to the PLC subsystem as a preset value.
Preferably, in the elongation rate control module, a specific elongation rate control method is as follows:
and the set elongation value and the actual elongation value sequentially pass through the PI regulator submodule and the amplitude limiting submodule and then output the rolling force regulating quantity, and the set rolling force value is further obtained.
Preferably, the rolling force setpoint value is obtained by compensating the rolling speed actual value, i.e. the rolling force setpoint value is obtained by increasing or decreasing the rolling force adjustment amount by the rolling speed actual value.
According to the automatic optimization method of the rolling force meter of the temper mill, provided by the invention, a PLC subsystem and a process computer subsystem are utilized, and the automatic optimization method comprises a PLC subsystem part;
the PLC subsystem part comprises a parameter acquisition step, an elongation rate control step and a PLC communication step;
a parameter acquisition step: collecting actual values of rolling parameters;
elongation rate control step: controlling the elongation rate according to a preset value;
PLC communication steps: sending the rolling parameters acquired in the parameter acquisition step to a process computer subsystem; and receives the preset values sent by the process computer subsystem.
Preferably, the rolling parameters comprise any one or any combination of a strip steel grade, a rolling force, an elongation, a current unit speed, a current strip steel width thickness and a tension of a temper mill; the preset values include any one or any combination of elongation set point, rolling force set point, speed-rolling force compensation value and front and back tension set point.
Preferably, in the elongation rate control step, a specific elongation rate control method is:
and the set elongation value and the actual elongation value sequentially pass through the PI regulator substep and the amplitude limiting substep, and then rolling force regulating quantity is output, and a rolling force set value is further obtained.
Preferably, the rolling force setpoint value is obtained by compensating the rolling speed actual value, i.e. the rolling force setpoint value is obtained by increasing or decreasing the rolling force adjustment amount by the rolling speed actual value.
Preferably, the rolling force table can be optimized by the following rolling force setting table optimization steps:
the process computer subsystem issues a preset value to the PLC subsystem, the PLC subsystem selects a rolling force set value according to the set of the unit to realize the response of elongation control, the actual value of the rolling parameter changes after the response, the changed rolling parameter is sent to the process computer subsystem, and the preset value is obtained again after model calculation and is issued to the PLC subsystem;
and continuously repeating the steps until the set conditions are met, and stopping to obtain the optimized rolling force setting table.
Compared with the prior art, the invention has the following beneficial effects:
the optimization control technical method can improve the rapidity and the stability of the elongation of the temper mill, reduce the length of the strip steel with inconsistent elongation when the temper mill passes a welding seam, and improve the product yield. The method can be used for reference for all planishers using cold rolling hot galvanizing and continuous annealing treatment lines similar to the cold rolling hot galvanizing treatment lines.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
fig. 1 is a schematic diagram of an elongation control system in a preferred embodiment of the automatic optimization system and method for the rolling force table of the temper mill provided by the invention.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
The automatic optimization system of the rolling force meter of the temper mill comprises a PLC subsystem and a process computer subsystem;
the PLC subsystem comprises a parameter acquisition module, an elongation rate control module and a PLC communication module;
a parameter acquisition module: collecting actual values of rolling parameters;
an elongation rate control module: controlling the elongation rate according to a preset value;
a PLC communication module: the rolling parameters acquired by the parameter acquisition module are sent to a process computer subsystem; and receives the preset values sent by the process computer subsystem.
The rolling parameters comprise any one or any combination of a rolling force, an elongation, a current unit speed, a current strip steel width thickness and a tension before and after the temper mill.
The process computer subsystem includes a neural network module;
the neural network module comprises an input layer and an output layer;
the input layer comprises any one or any combination of seven of unit speed, strip steel grade, strip steel width, strip steel thickness, the actual value of front and rear tension of the temper mill and the actual value of elongation; the data source of the input layer is rolling parameters sent by the PLC subsystem;
the output layer comprises any one or any combination of five of an elongation set value, a rolling force set value, a speed-rolling force compensation value and a front-back tension set value; and the data obtained by the output layer is sent to the PLC subsystem as a preset value.
In the elongation rate control module, a specific elongation rate control method is as follows:
and the set elongation value and the actual elongation value sequentially pass through the PI regulator submodule and the amplitude limiting submodule and then output the rolling force regulating quantity, and the set rolling force value is further obtained.
The rolling force set value is obtained by compensating the actual rolling speed value, namely the rolling force set value is obtained by increasing or decreasing the rolling force regulating quantity through the actual rolling speed value.
According to the automatic optimization method of the rolling force meter of the temper mill, provided by the invention, a PLC subsystem and a process computer subsystem are utilized, and the automatic optimization method comprises a PLC subsystem part;
the PLC subsystem part comprises a parameter acquisition step, an elongation rate control step and a PLC communication step;
a parameter acquisition step: collecting actual values of rolling parameters;
elongation rate control step: controlling the elongation rate according to a preset value;
PLC communication steps: sending the rolling parameters acquired in the parameter acquisition step to a process computer subsystem; and receives the preset values sent by the process computer subsystem.
The rolling parameters comprise any one or any combination of a plurality of steel strip grades, rolling force, elongation, current unit speed, current steel strip width thickness and front and rear tension of the temper mill; the preset values include any one or any combination of elongation set point, rolling force set point, speed-rolling force compensation value and front and back tension set point.
In the elongation control step, a specific elongation control method is as follows:
and the set elongation value and the actual elongation value sequentially pass through the PI regulator substep and the amplitude limiting substep, and then rolling force regulating quantity is output, and a rolling force set value is further obtained.
The rolling force set value is obtained by compensating the actual rolling speed value, namely the rolling force set value is obtained by increasing or decreasing the rolling force regulating quantity through the actual rolling speed value.
The rolling force table can be optimized through the following rolling force setting table optimization steps:
the process computer subsystem issues a preset value to the PLC subsystem, the PLC subsystem selects a rolling force set value according to the set of the unit to realize the response of elongation control, the actual value of the rolling parameter changes after the response, the changed rolling parameter is sent to the process computer subsystem, and the preset value is obtained again after model calculation and is issued to the PLC subsystem;
and continuously repeating the steps until the set conditions are met, and stopping to obtain the optimized rolling force setting table.
Further, preferred embodiments of the present invention are directed to:
the set value of the rolling force is dynamically optimized, the accuracy of the set value is effectively improved, a dynamic speed-rolling force compensation curve is automatically optimized, the accuracy of the elongation of the strip steel is effectively improved, the length which does not accord with the elongation of the over-welding seam of the temper mill is shortened, and therefore the product quality and the yield are improved.
The technical scheme of the preferred embodiment of the invention is as follows:
the technical scheme provides a method for automatically optimizing the rolling force table of the temper mill, so as to achieve automatic and dynamic maintenance of the rolling force setting table. Thereby greatly improving the accuracy of the setting of the rolling force.
The main factors influencing the elongation of the strip steel are as follows: unit speed, strip steel grade, strip steel width, strip steel thickness and temper mill front and back tension. Based on these factors, a neural network is used to intelligently optimize the system rolling force settings.
The system mainly utilizes the original L1 PLC system and the process computer L2 system to form. The main functions of the PLC system include: providing actual values such as rolling force, elongation, current unit speed, current strip steel width thickness, tension before and after the temper mill and the like for a computer system; and the elongation rate is controlled according to a preset value issued by the computer system model. Wherein the elongation control is achieved by adjusting the rolling force setpoint as shown in figure 1. At a constant rolling speed, the elongation is smaller as the rolling force is smaller, whereas the elongation is larger. During acceleration and deceleration, a rolling force compensation value is required, and quick response is realized.
The process computer L2 system primary functions include: and establishing the rolling force setting of the neural network intelligent optimization system by using each actual value obtained from the L1 PLC system. The system is a 3-layer neural network system. The input layer has 7 units and is a main factor influencing the elongation of the strip steel. The method comprises the steps of measuring the speed of a unit, the grade of strip steel, the width of the strip steel, the thickness of the strip steel, the actual value of the front and rear tension of a temper mill and the actual value of the elongation. The output layer has 5 units of elongation set value, rolling force set value, speed-rolling force compensation value and front and back tension set value.
By adopting the system, an automatic optimized rolling force table is obtained. When the set value is issued from the L2 to the L1, the set value of the elongation percentage of the strip steel under the current specification, the set value of the rolling force and the compensation value under each speed are issued to the L1 system at one time. The L1 system flexibly selects the set value of the rolling force according to the set of the unit, thereby realizing the quick response of the elongation control. And returning each actual value after rolling to the L2 computer system, and continuously optimizing the rolling force setting table through model calculation.
Example 1: after the 1550 hot galvanizing unit of the Baoyijiang cold rolling mill for Baoyi steel is used by the optimization control technology, the fluctuation range of the elongation of the temper mill is obviously reduced, the fluctuation time is shortened, and the elongation of the over-welded joint does not conform to the length and is greatly reduced.
In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (10)
1. An automatic optimization system of a temper mill rolling force table is characterized by comprising a PLC subsystem and a process computer subsystem;
the PLC subsystem comprises a parameter acquisition module, an elongation rate control module and a PLC communication module;
a parameter acquisition module: collecting actual values of rolling parameters;
an elongation rate control module: controlling the elongation rate according to a preset value;
a PLC communication module: the rolling parameters acquired by the parameter acquisition module are sent to a process computer subsystem; and receives the preset values sent by the process computer subsystem.
2. The system of claim 1, wherein the rolling parameters include any one or any combination of rolling force, elongation, current train speed, current strip width thickness, and temper mill back and forth tension.
3. The system for automatically optimizing a temper mill rolling force table according to claim 1, wherein said process computer subsystem comprises a neural network module;
the neural network module comprises an input layer and an output layer;
the input layer comprises any one or any combination of seven of unit speed, strip steel grade, strip steel width, strip steel thickness, the actual value of front and rear tension of the temper mill and the actual value of elongation; the data source of the input layer is rolling parameters sent by the PLC subsystem;
the output layer comprises any one or any combination of five of an elongation set value, a rolling force set value, a speed-rolling force compensation value and a front-back tension set value; and the data obtained by the output layer is sent to the PLC subsystem as a preset value.
4. The automatic optimization system of the temper mill rolling force table according to claim 1, wherein in the elongation control module, a specific elongation control method comprises the following steps:
and the set elongation value and the actual elongation value sequentially pass through the PI regulator submodule and the amplitude limiting submodule and then output the rolling force regulating quantity, and the set rolling force value is further obtained.
5. The system of claim 4, wherein the rolling force setpoint is compensated by an actual rolling speed value, i.e. the rolling force setpoint is increased or decreased by an adjustment of the rolling force.
6. An automatic optimization method for a rolling force meter of a temper mill is characterized in that a PLC subsystem and a process computer subsystem are utilized, and the process computer subsystem comprises a PLC subsystem part;
the PLC subsystem part comprises a parameter acquisition step, an elongation rate control step and a PLC communication step;
a parameter acquisition step: collecting actual values of rolling parameters;
elongation rate control step: controlling the elongation rate according to a preset value;
PLC communication steps: sending the rolling parameters acquired in the parameter acquisition step to a process computer subsystem; and receives the preset values sent by the process computer subsystem.
7. The method of claim 6, wherein the rolling parameters include any one or any combination of strip grade, rolling force, elongation, current set speed, current strip width thickness, and temper mill front and rear tension; the preset values include any one or any combination of elongation set point, rolling force set point, speed-rolling force compensation value and front and back tension set point.
8. The automatic optimization method of the temper mill rolling force table according to claim 6, wherein in the elongation control step, the specific elongation control method comprises the following steps:
and the set elongation value and the actual elongation value sequentially pass through the PI regulator substep and the amplitude limiting substep, and then rolling force regulating quantity is output, and a rolling force set value is further obtained.
9. The method of claim 8, wherein the rolling force setpoint is compensated by an actual rolling speed value, i.e. the rolling force setpoint is increased or decreased by an adjustment of the rolling force.
10. The system for automatically optimizing a temper mill rolling force table or the method for automatically optimizing a temper mill rolling force table according to any one of claims 1 to 9, wherein the rolling force table can be optimized by the following rolling force setting table optimization steps:
the process computer subsystem issues a preset value to the PLC subsystem, the PLC subsystem selects a rolling force set value according to the set of the unit to realize the response of elongation control, the actual value of the rolling parameter changes after the response, the changed rolling parameter is sent to the process computer subsystem, and the preset value is obtained again after model calculation and is issued to the PLC subsystem;
and continuously repeating the steps until the set conditions are met, and stopping to obtain the optimized rolling force setting table.
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| CN113649420A (en) * | 2021-07-28 | 2021-11-16 | 首钢京唐钢铁联合有限责任公司 | Temper mill rolling force obtaining method and device |
| CN114505349A (en) * | 2022-01-26 | 2022-05-17 | 宝钢湛江钢铁有限公司 | Automatic control method for technological parameters of cold rolling temper mill |
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