CN113042538A - Control method and device for rolling deviation of hot rolled strip steel - Google Patents
Control method and device for rolling deviation of hot rolled strip steel Download PDFInfo
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- CN113042538A CN113042538A CN202110235807.3A CN202110235807A CN113042538A CN 113042538 A CN113042538 A CN 113042538A CN 202110235807 A CN202110235807 A CN 202110235807A CN 113042538 A CN113042538 A CN 113042538A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
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- B21B37/20—Automatic gauge control in tandem mills
Abstract
The invention relates to the technical field of hot rolled strip steel production, in particular to a method and a device for controlling rolling deviation of hot rolled strip steel, wherein the method comprises the following steps: controlling the head of the intermediate billet to pass through an F7 rolling mill within a first preset time so that the intermediate billet is stably placed in a finishing mill group; starting an automatic thickness control AGC system after the first preset time; adjusting the AGC system to a first working mode, and controlling a finishing mill group to roll an intermediate billet based on the AGC system; wherein the first operating mode is for setting the amplitude of the F7 mill to be different from the amplitudes of the other mills, which are located before the F7 mill; when the rolling length of the intermediate billet is greater than the preset length, the AGC system is adjusted to be in a second working mode, and the finishing mill group is controlled to roll the intermediate billet based on the AGC system; wherein the second operating mode is used to set the amplitude of the F7 mill to be the same as the amplitude of the other mills. The invention can scientifically and effectively improve the rolling stability and reduce the risks of deviation, rolling breakage and the like of the strip steel rolling.
Description
Technical Field
The invention relates to the technical field of hot rolled strip steel production, in particular to a method and a device for controlling rolling deviation of hot rolled strip steel.
Background
With the increasing competition of the steel industry in China, new product development is greatly promoted by all large steel enterprises. On one hand, the requirement on the strength of the steel material is improved due to the requirement on the lightweight of the steel material; on the other hand, in order to further reduce the production cost, a hot rolling process is required to replace a cold rolling process for part of strip steel products so as to expand the strip steel to a thin specification. The high-strength thin-gauge strip steel has great market competitiveness, but for a conventional hot continuous rolling production line, the rolling stability of the strip steel becomes a technical bottleneck, and the main problems are the deviation, rolling breakage and the like in the process of threading and steel throwing.
Currently, an AGC (Automatic Gauge Control) Control system is widely used in a hot continuous rolling mill train. However, in the process of threading high-strength thin gauge steel, if the set deviation of the rolling force is large, the deviation rolling accident of the strip steel caused by large AGC adjustment amplitude is easy to occur, and the production stability of the thin gauge strip steel product is seriously influenced.
Therefore, how to control the rolling deviation of the hot rolled strip steel is a technical problem to be solved urgently at present.
Disclosure of Invention
The embodiment of the application provides a method and a device for controlling rolling deviation of hot rolled strip steel, solves the technical problem of how to control the rolling deviation of the hot rolled strip steel in the prior art, effectively improves the threading stability of thin gauge strip steel, reduces the risks of deviation and rolling breakage in the threading process of the strip steel, and provides the working procedure yield and the production efficiency.
In a first aspect, an embodiment of the present invention provides a method for controlling rolling deviation of hot rolled strip steel, including:
controlling the head of the intermediate billet to pass through the F7 rolling mill within a first preset time so that the intermediate billet is stably placed in the finishing mill group;
after the first preset time, starting an automatic thickness control AGC system;
adjusting the AGC system to a first working mode, and controlling the finishing mill group to roll the intermediate billet based on the AGC system; wherein the first operating mode is for setting the F7 mill to a different amplitude than other mills located before the F7 mill;
when the rolling length of the intermediate billet is greater than the preset length, adjusting the AGC system to a second working mode, and controlling the finishing mill group to roll the intermediate billet based on the AGC system; wherein the second operating mode is for setting the amplitude of the F7 rolling mill to be the same as the amplitude of the other rolling mills.
Preferably, before the controlling the head of the intermediate billet to pass through the F7 rolling mill within the first preset time, the method further comprises:
detecting whether a rolling force exists in the F7 rolling mill by a first pressure head, wherein the first pressure head is arranged on the F7 rolling mill;
when the rolling force is detected, a timer is started.
Preferably, when the rolling length of the intermediate billet is greater than a preset length, the adjusting the AGC system to a second operating mode and controlling the finishing mill group to roll the intermediate billet based on the AGC system includes:
acquiring the motor speed and the current timing time of the F7 rolling mill;
obtaining the rolling length of the intermediate billet according to the motor speed of the F7 rolling mill and the current timing time;
judging whether the rolling length is greater than the preset length;
and controlling the AGC system to keep the first working mode when the rolling length is not more than the preset length.
Preferably, the finishing mill group further comprises: an F5 rolling mill and an F6 rolling mill, the F5 rolling mill being disposed before the F6 rolling mill, the F6 rolling mill being disposed before the F7 rolling mill, the AGC system comprising: a first AGC disposed on the F7 mill, a second AGC disposed on the F6 mill, and a third AGC disposed on the F5 mill;
the adjusting the AGC system to a first mode of operation includes:
starting the first AGC, and setting the amplitude of the F7 rolling mill to be a first amplitude limit through the first AGC; the amplitude of the first amplitude limit is less than or equal to a first preset value, and the value range of the first preset value is 0.4-0.6 mm;
turning on the second AGC, and setting the amplitude of the F6 rolling mill to be a second amplitude limit through the second AGC; the amplitude of the second amplitude limit is less than or equal to a second preset value, and the value range of the second preset value is 0.6-0.8 mm;
turning on the third AGC, and setting the amplitude of the F5 rolling mill to be a third amplitude limit through the third AGC; and the amplitude of the third amplitude limit is less than or equal to a third preset value, and the value range of the third preset value is 0.9-1.1 mm.
Preferably, the adjusting the AGC system to the first operating mode and controlling the finishing mill group to roll the intermediate billet based on the AGC system includes:
detecting rolling data by the first ram, a second ram, and a third ram, wherein the second ram is disposed on the F6 rolling mill and the third ram is disposed on the F5 rolling mill;
and rolling the intermediate billet according to the first amplitude limit, the second amplitude limit, the third amplitude limit and the rolling data.
Preferably, when the rolling length of the intermediate billet is greater than a preset length, the step of adjusting the AGC system to a second working mode, and controlling the finishing mill group to roll the intermediate billet based on the AGC system includes:
when the rolling length of the intermediate billet is greater than the preset length, respectively setting the first amplitude limiting, the second amplitude limiting and the third amplitude limiting to be preset amplitudes through the first AGC, the second AGC and the third AGC, wherein the preset amplitudes are 2 mm;
and rolling the intermediate blank according to the set first amplitude limit, the second amplitude limit and the third amplitude limit to obtain the strip steel.
Preferably, the finishing mill group further comprises: a first loop and a second loop, the first loop disposed between the F6 rolling mill and the F7 rolling mill, the second loop disposed between the F5 rolling mill and the F6 rolling mill;
before the controlling the head of the intermediate billet to pass through the F7 rolling mill, the method further comprises the following steps:
detecting the rolling force of the F6 rolling mill through the second pressure head;
starting the second loop according to the rolling force of the F6 rolling mill;
detecting the rolling force of the F7 rolling mill through the first pressure head;
and starting the first loop according to the rolling force of the F7 rolling mill so as to keep the length of the steel strip stable during rolling.
Based on the same inventive concept, in a second aspect, the invention further provides a device for controlling rolling deviation of hot rolled strip steel, which comprises:
a first module for controlling the head of the intermediate billet to pass through the F7 rolling mill for a first preset time to place the intermediate billet stably in the finishing train;
the second module is used for starting the automatic thickness control AGC system after the first preset time; adjusting the AGC system to a first working mode, and controlling the finishing mill group to roll the intermediate billet based on the AGC system; wherein the first operating mode is for setting the F7 mill to a different amplitude than other mills located before the F7 mill;
the third module is used for adjusting the AGC system to a second working mode when the rolling length of the intermediate billet is greater than the preset length, and controlling the finishing mill group to roll the intermediate billet based on the AGC system; wherein the second operating mode is for setting the amplitude of the F7 rolling mill to be the same as the amplitude of the other rolling mills.
Based on the same inventive concept, in a third aspect, the invention provides a computer device, comprising a memory, a processor and a computer program stored on the memory and operable on the processor, wherein the processor implements the steps of the method for controlling rolling deviation of hot strip steel when executing the program.
Based on the same inventive concept, in a fourth aspect, the present invention provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the method for controlling rolling deviation of hot rolled strip.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
1. in the embodiment of the application, the method for controlling the rolling deviation of the hot rolled strip is provided, and in the method, the head of the intermediate billet firstly stably passes through an F7 rolling mill, so that the fact that the intermediate billet is stably placed in a finishing mill group is indicated, and a stable foundation is provided for subsequent rolling work. And then, starting the AGC system, and controlling the AGC system to be in a first working mode, wherein the amplitude of the F7 rolling mill is set to be different from the amplitudes of other rolling mills in the first working mode, and the first working mode is to preheat the finishing mill group to work because the finishing mill group is unstable when the AGC system is just started. When the rolling length of the intermediate billet is greater than the preset length, the AGC system is adjusted to a second operating mode setting the amplitude of the F7 rolling mill to be the same as the amplitudes of the other rolling mills. At the moment, the work of the finishing mill group is stable, and the intermediate billet can be stably rolled to form the strip steel with high precision and thickness. Therefore, the method is simple and practical, and can scientifically and effectively improve the rolling stability, thereby reducing the risks of deviation, rolling breakage and the like of the strip steel in the threading process.
2. In the embodiment of the application, the AGC system is used after being lagged, and the first working mode is adopted when the AGC system is started, so that the AGC system and the finishing mill set work in a preheating mode, and the AGC system and the finishing mill set gradually keep stable work after self adjustment. Then, after the strip steel is stably tensioned, the AGC system is adjusted to the second working mode to roll the thin strip steel, so that the yield and the production efficiency of the hot rolling thin specification are improved.
3. In the embodiment of the application, because the intermediate billet can expand when being rolled, in order to ensure that the intermediate billet is normally rolled and does not deviate, the second loop is arranged between the F5 rolling mill and the F6 rolling mill, and the first loop is arranged between the F6 rolling mill and the F7 rolling mill, so that the tension is established between the two rolling mills by the loop, and the strip steel is kept stable in the length direction when being rolled.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a schematic flow chart illustrating steps of a hot-rolled strip rolling deviation control method in an embodiment of the invention;
FIG. 2 shows a schematic structural view of a hot strip rolling process in an embodiment of the present invention;
FIG. 3 is a block diagram showing a control device for hot strip rolling deviation in the embodiment of the invention;
fig. 4 shows a schematic structural diagram of a computer device in an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
Example one
The first embodiment of the present invention provides a method for controlling rolling deviation of hot rolled strip, as shown in fig. 1, including:
s101, controlling the head of the intermediate billet 201 to pass through an F7 rolling mill 206 within a first preset time so as to enable the intermediate billet 201 to be stably placed in a finishing mill group;
s102, starting an automatic thickness control AGC system after first preset time;
s103, adjusting the AGC system to a first working mode, and controlling the finishing mill group to roll the intermediate billet 201 based on the AGC system; wherein the first operating mode is for setting the amplitude of the F7 mill 206 to be different from the amplitudes of the other mills, which are located before the F7 mill 206;
s104, when the rolling length of the intermediate billet 201 is greater than the preset length, adjusting the AGC system to a second working mode, and controlling the finishing mill group to roll the intermediate billet 201 based on the AGC system; wherein the second mode of operation is used to set the amplitude of the F7 mill 206 to be the same as the amplitudes of the other mills.
It should be noted that the method of the present embodiment is applied to a finishing mill group in a hot continuous rolling mill group, and the finishing mill group includes an F7 rolling mill 206. In the hot rolling process, the finishing train usually comprises seven rolling mills, numbered 1, 2, 3.. 7 in sequence, and the rolling mills are named as "model + number" according to the model of the rolling mill. In the present embodiment, the F7 rolling mill 206 represents the seventh rolling mill in the finishing mill group, and the type of rolling mill is not limited, and similarly, the later-used F1 rolling mill and F2 rolling mill.
In the hot rolling process, after the slab is rough rolled, an intermediate slab 201 is formed, and the intermediate slab 201 passes through a finishing mill group to form the strip steel. The rolling process of the intermediate billet 201 in the finishing train is shown in fig. 2, and the intermediate billet 201 passes through a finishing train F1 rolling mill, an F2 rolling mill, an F3 rolling mill, an F4 rolling mill, an F5 rolling mill 202, an F6 rolling mill 204 and an F7 rolling mill 206 (the F1 rolling mill, the F2 rolling mill, the F3 rolling mill and the F4 rolling mill are not shown in fig. 2) in sequence to form a strip steel. Wherein a loop is arranged between the rolling mills. For example, in fig. 2, the loop between F5 rolling mill 202 and F6 rolling mill 204 is referred to as second loop 203, and the loop between F6 rolling mill 204 and F7 rolling mill 206 is referred to as first loop 205. The strip steel passes through an output roller table 207 and a pinch roller 208 in sequence, is conveyed to a mandrel 209, and is wound and coiled by the mandrel 209.
In the rolling process of the finishing mill train, the amplitude of the F7 rolling mill 206 is the amplitude of the pressing-down of the intermediate slab 201 by the F7 rolling mill 206, for example, if the intermediate slab 201 has a thickness of 5 mm and needs to be rolled into a strip steel having a thickness of 3 mm, the amplitude of the F7 rolling mill 206 is 2 mm to roll the intermediate slab 201 having a thickness of 5 mm. It will be appreciated by the same token that the magnitude of the other rolling mills preceding the F7 rolling mill 206 is the magnitude of the depression of the corresponding numbered rolling mill rolling the intermediate billet 201.
In this embodiment, the head of the intermediate billet 201 first passes stably through the F7 rolling mill 206, indicating that the intermediate billet 201 has been placed stably in the finishing train, providing a stable foundation for subsequent rolling operations. Then, the AGC system is started, and the AGC system is controlled to a first operation mode, where the amplitude of the F7 rolling mill 206 is set to be different from the amplitudes of the other rolling mills, and since the finishing mill group is not operating stably just when the AGC is started, the first operation mode is to operate in the preheating finishing mill group. When the rolling length at the intermediate billet 201 is greater than the preset length, the AGC system is adjusted to a second operating mode that sets the amplitude of the F7 rolling mill 206 to be the same as the amplitudes of the other rolling mills. At this time, the work of the finishing mill group is already stable, and the intermediate slab 201 can be stably rolled to form a high-precision thick strip steel. Therefore, the method of the embodiment is simple and practical, and can scientifically and effectively improve the rolling stability, so that the risks of deviation, rolling breakage and the like of the strip steel in the threading process are reduced.
Before specifically executing step S101, the method further includes:
detecting whether the rolling force exists in the F7 rolling mill 206 by a first ram, wherein the first ram is arranged on the F7 rolling mill 206; when the rolling force is detected, a timer is started.
Specifically, before step S101 is specifically performed, the head of the intermediate slab 201 passes through the rolling mill preceding the F7 rolling mill 206, reaches the F7 rolling mill 206, and the F7 rolling mill 206 starts rolling the intermediate slab 201 once it contacts the head of the intermediate slab 201. At this time, when F7 starts rolling the head of the intermediate billet 201, the rolling force is generated by the F7 rolling mill 206, and when the first ram detects the rolling force generated by F7, the time measurement is started.
After the timer is started, step S101 is executed. Specifically, a time point is selected from 1.5 seconds to 3 seconds, and the head of the intermediate billet 201 is controlled to pass through the F7 rolling mill 206 from the beginning of the timing to the time point, so that the intermediate billet 201 is stably placed in the finishing mill group. For example, the head of the intermediate billet 201 is controlled to pass through the F7 rolling mill 206 within 0 seconds to 1.5 seconds.
Then, after the head of the intermediate slab 201 passes through the F7 rolling mill 206, the AGC system is activated, the AGC system is adjusted to the first operation mode, and the intermediate slab 201 is rolled based on the first operation mode of the AGC system, which are performed in step S102 and step S103. For example, 1.5 seconds, the AGC system is activated and adjusted to the first mode of operation.
Specifically, the finishing mill group further includes: f5 rolling mill 202 and F6 rolling mill 204, F5 rolling mill 202 is disposed before F6 rolling mill 204, F6 rolling mill 204 is disposed before F7 rolling mill 206, and the AGC system includes: a first AGC disposed on F7 rolling mill 206, a second AGC disposed on F6 rolling mill 204, and a third AGC disposed on F5 rolling mill 202;
the first operation mode of the AGC system specifically includes:
turning on a first AGC, and setting the amplitude of the F7 rolling mill 206 to a first amplitude limit by the first AGC; the amplitude of the first amplitude limit is less than or equal to a first preset value, and the value range of the first preset value is 0.4-0.6 mm (for example, 0.4 mm, or 0.5 mm, or 0.6 mm, etc.);
starting a second AGC, and setting the amplitude of the F6 rolling mill 204 to be a second amplitude limit through the second AGC; the amplitude of the second amplitude limit is less than or equal to a second preset value, and the value range of the second preset value is 0.6-0.8 mm (for example, 0.6 mm, or 0.7 mm, or 0.8 mm, etc.);
starting a third AGC, and setting the amplitude of the F5 rolling mill 202 to be a third amplitude limit through the third AGC; the amplitude of the third amplitude limit is less than or equal to a third preset value, and the value range of the third preset value is 0.9-1.1 mm (for example, 0.9 mm, or 1 mm, or 1.1 mm, etc.).
It should be noted that, in this embodiment, the F1 rolling mill to the F4 rolling mill in the finishing mill group is before the F5 rolling mill 202, and since the slab of the intermediate slab 201 in the F1 rolling mill to the F4 rolling mill is thick, the adjustment of the F1 rolling mill to the F4 rolling mill by the AGC system has a small influence on the rolling stability, so the ranges of the F1 rolling mill to the F4 rolling mill are not limited. However, the range of F1 rolling mills to F4 rolling mills can be limited depending on the particular implementation or practical requirements.
Preferably, the amplitude of the first AGC setting F7 mill 206 is 0.5 mm or less, the amplitude of the second AGC setting F6 mill 204 is 0.7 mm or less, and the amplitude of the third AGC setting F5 mill 202 is 1 mm or less.
When the AGC system is adjusted to the first operating mode, and the rolling of the intermediate slab 201 by the finishing mill group is controlled based on the first operating mode of the AGC system, which specifically includes:
detecting rolling data by a first ram, a second ram, and a third ram, wherein the second ram is disposed on the F6 rolling mill 204, and the third ram is disposed on the F5 rolling mill 202; and rolling the intermediate billet 201 according to the first amplitude limit, the second amplitude limit, the third amplitude limit and the rolling data.
To more clearly state how the F5 rolling mill 202 through the F7 rolling mill 206 are operating in the first mode of operation, by way of example. For example, in the first mode of operation, the amplitude of the F7 mill 206 is set to 0.7 mm, and the F7 mill 206 rolls the intermediate billet 201 with a 0.7 mm slice, wherein the 0.7 mm amplitude would correspond to a rolling force value (referred to herein as a preset value). The AGC system is now enabled, which can cause unstable operation of the F7 rolling mill 206. Detecting the rolling force of the F7 rolling mill 206 when rolling the intermediate billet 201 by the first pressure head, namely detecting the detected rolling data; the F7 rolling mill 206 can perform self-adjustment to gradually stabilize to an operating state with a limiter of 0.7 according to the rolling force of the F7 rolling mill 206 when rolling the intermediate slab 201. If the first pressure head detects that the rolling force of the F7 rolling mill 206 is greater than a preset value, lifting the adjusting roller on the F7 rolling mill 206; if the first ram detects that the rolling force of the F7 rolling mill 206 is less than the preset value, F5 pushes down the adjustment roller. It can be analogized how the F5 rolling mill 202 and the F6 rolling mill 204 work.
Therefore, since the work of the finishing mill group is unstable immediately after the AGC system is put into operation, the AGC system and the finishing mill group are preheated by setting the first operation mode.
Before step S104 is executed, it needs to be determined whether the AGC system is stable in the first operating mode, specifically, the determining includes:
acquiring the motor speed and the current timing time of the F7 rolling mill 206; obtaining the rolling length of the intermediate billet 201 according to the motor speed and the current timing time of the F7 rolling mill 206; judging whether the rolling length is greater than a preset length or not; and when the rolling length is not more than the preset length, controlling the AGC system to keep a first working mode.
Specifically, the preset length is generally 20 meters, which is set by experimental data or requirements. And the AGC system needs to calculate the rolling length in the first working mode, and whether the AGC system works stably in the first working mode is judged by comparing the rolling length with the preset length. The rolling length is obtained by the motor speed of the F7 rolling mill 206 and the current timing time, that is, the rolling length is equal to the motor speed of the F7 rolling mill 206 and the current timing time. When the rolling length is less than or equal to 20m, the AGC system keeps a first working mode; and when the rolling length is more than 20m, the AGC system is set to be in a second working mode.
In a specific implementation process, step S104 includes:
when the rolling length of the intermediate billet 201 is greater than the preset length, respectively setting a first amplitude limit, a second amplitude limit and a third amplitude limit to be preset amplitudes through a first AGC, a second AGC and a third AGC, wherein the preset amplitudes are 2 mm; and rolling the intermediate blank 201 according to the set first amplitude limit, the second amplitude limit and the third amplitude limit to obtain the strip steel.
The second operating mode of the AGC system is specifically: when the rolling length is larger than the preset length, the AGC system sets the amplitude of the F5 rolling mill 202, the amplitude of the F6 rolling mill 204 and the amplitude of the F7 rolling mill 206 to be preset amplitudes, the preset amplitudes are 2 millimeters, and the preset amplitudes are set according to actual requirements. Then, the F5 rolling mill 202, the F6 rolling mill 204, and the F7 rolling mill 206 stably roll the intermediate slab 201 at this magnitude.
As shown in fig. 2, the finishing mill group further includes: a first loop 205 and a second loop 203, the first loop 205 being disposed between F6 rolling mill 204 and F7 rolling mill 206, the second loop 203 being disposed between F5 rolling mill 202 and F6 rolling mill 204.
Before the head of the intermediate billet 201 passes through the F7 rolling mill 206, the method further comprises:
detecting the rolling force of the F6 rolling mill 204 by the second ram; starting the second loop 203 according to the rolling force of the F6 rolling mill 204; detecting the rolling force of the F7 rolling mill 206 by the first ram; the first loop 205 is activated according to the rolling force of the F7 rolling mill 206 to keep the strip length stable while rolling.
Specifically, when the head of the intermediate slab 201 passes through the F5 rolling mill 202 and contacts the F6 rolling mill 204, the F6 rolling mill 204 generates a rolling force. The rolling force generated by the F6 rolling mill 204 is detected by the second ram, and the second loop 203 is activated to lift the second loop 203 upward. The head of the intermediate billet 201 then passes through an F6 rolling mill 204 and contacts an F7 rolling mill 206, which generates a rolling force in the F7 rolling mill 206. The rolling force generated by the F7 rolling mill 206 is detected by the first ram, and not only is the timing started, but the first loop 205 is also started to lift the first loop 205 upward. Because the intermediate billet 201 can expand when being rolled, in order to ensure that the intermediate billet 201 is normally rolled and does not deviate, tension is established between the two rolling mills through a loop, so that the strip steel keeps stable in the length direction when being rolled.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
1. in this example, the head of the intermediate billet first stabilized through the F7 mill, indicating that the intermediate billet has been stably placed in the finishing train, providing a stable foundation for subsequent rolling operations. And then, starting the AGC system, and controlling the AGC system to be in a first working mode, wherein the amplitude of the F7 rolling mill is set to be different from the amplitudes of other rolling mills in the first working mode, and the first working mode is to preheat the finishing mill group to work because the finishing mill group is unstable when the AGC system is just started. When the rolling length of the intermediate billet is greater than the preset length, the AGC system is adjusted to a second operating mode setting the amplitude of the F7 rolling mill to be the same as the amplitudes of the other rolling mills. At the moment, the work of the finishing mill group is stable, and the intermediate billet can be stably rolled to form the strip steel with high precision and thickness. Therefore, the method of the embodiment is simple and practical, and can scientifically and effectively improve the rolling stability, so that the risks of deviation, rolling breakage and the like of the strip steel in the threading process are reduced.
2. In this embodiment, the AGC system is put into use after delay, and when turned on, the first operating mode is adopted to preheat the AGC system and the finishing mill group to operate, so that the AGC system and the finishing mill group perform self-adjustment and gradually keep stable operation. Then, after the strip steel is stably tensioned, the AGC system is adjusted to the second working mode to roll the thin strip steel, so that the yield and the production efficiency of the hot rolling thin specification are improved.
3. In this embodiment, since the intermediate billet is expanded when being rolled, in order to ensure that the intermediate billet is normally rolled without deviation, the second loop is arranged between the F5 rolling mill and the F6 rolling mill, and the first loop is arranged between the F6 rolling mill and the F7 rolling mill, so that the loop establishes tension between the two rolling mills, and the strip steel keeps stable in the length direction when being rolled.
Example two
Based on the same inventive concept, the second embodiment of the present invention further provides a device for controlling rolling deviation of hot rolled strip, which is applied to a finishing mill group, wherein the finishing mill group comprises: f7 rolling mill, as shown in fig. 3, said device comprising:
a first module 301 for controlling the head of the intermediate billet to pass through the F7 rolling mill for a first preset time to allow the intermediate billet to be stably positioned in the finishing train;
a second module 302, configured to start an automatic thickness control AGC system after the first preset time; adjusting the AGC system to a first working mode, and controlling the finishing mill group to roll the intermediate billet based on the AGC system; wherein the first operating mode is for setting the F7 mill to a different amplitude than other mills located before the F7 mill;
a third module 303, configured to, when the rolling length of the intermediate billet is greater than a preset length, adjust the AGC system to a second working mode, and control the finishing mill group to roll the intermediate billet based on the AGC system; wherein the second operating mode is for setting the amplitude of the F7 rolling mill to be the same as the amplitude of the other rolling mills.
As an alternative embodiment, the first module 301 further includes: detecting whether a rolling force exists in the F7 rolling mill by a first pressure head, wherein the first pressure head is arranged on the F7 rolling mill; when the rolling force is detected, a timer is started.
As an alternative embodiment, the apparatus further comprises: a calculation module 304 and a judgment module 305;
the calculation module 304 is used for acquiring the motor speed and the current timing time of the F7 rolling mill; and obtaining the rolling length of the intermediate billet according to the motor speed of the F7 rolling mill and the current timing time.
The judging module 305 is configured to judge whether the rolling length is greater than the preset length; and controlling the AGC system to keep the first working mode when the rolling length is not more than the preset length.
As an alternative embodiment, the finishing train further comprises: an F5 rolling mill and an F6 rolling mill, the F5 rolling mill being disposed before the F6 rolling mill, the F6 rolling mill being disposed before the F7 rolling mill, the AGC system comprising: a first AGC disposed on the F7 mill, a second AGC disposed on the F6 mill, and a third AGC disposed on the F5 mill;
a second module 302, further comprising:
starting the first AGC, and setting the amplitude of the F7 rolling mill to be a first amplitude limit through the first AGC; the amplitude of the first amplitude limit is less than or equal to a first preset value, and the value range of the first preset value is 0.4-0.6 mm
Turning on the second AGC, and setting the amplitude of the F6 rolling mill to be a second amplitude limit through the second AGC; the amplitude of the second amplitude limit is less than or equal to a second preset value, and the value range of the second preset value is 0.6-0.8 mm;
turning on the third AGC, and setting the amplitude of the F5 rolling mill to be a third amplitude limit through the third AGC; and the amplitude of the third amplitude limit is less than or equal to a third preset value, and the value range of the third preset value is 0.9-1.1 mm.
As an alternative embodiment, the adjusting the AGC system to the first operating mode and controlling the finishing train to roll the intermediate billet based on the AGC system includes:
detecting rolling data by the first ram, a second ram, and a third ram, wherein the second ram is disposed on the F6 rolling mill and the third ram is disposed on the F5 rolling mill;
and rolling the intermediate billet according to the first amplitude limit, the second amplitude limit, the third amplitude limit and the rolling data.
As an alternative embodiment, the third module 303 includes:
when the rolling length of the intermediate billet is greater than the preset length, respectively setting the first amplitude limiting, the second amplitude limiting and the third amplitude limiting to be preset amplitudes through the first AGC, the second AGC and the third AGC, wherein the preset amplitudes are 2 mm;
and rolling the intermediate blank according to the set first amplitude limit, the second amplitude limit and the third amplitude limit to obtain the strip steel.
As an alternative embodiment, the finishing train further comprises: a first loop and a second loop, the first loop disposed between the F6 rolling mill and the F7 rolling mill, the second loop disposed between the F5 rolling mill and the F6 rolling mill;
the first module 301 further comprises: detecting the rolling force of the F6 rolling mill through the second pressure head; starting the second loop according to the rolling force of the F6 rolling mill; detecting the rolling force of the F7 rolling mill through the first pressure head; and starting the first loop according to the rolling force of the F7 rolling mill so as to keep the length of the steel strip stable during rolling.
Since the device for controlling rolling deviation of hot rolled strip described in this embodiment is a device used for implementing the method for controlling rolling deviation of hot rolled strip described in the first embodiment of this application, based on the method for controlling rolling deviation of hot rolled strip described in the first embodiment of this application, a person skilled in the art can understand the specific implementation manner and various variations of the device for controlling rolling deviation of hot rolled strip described in this embodiment of this application, and therefore, how to implement the method described in the first embodiment of this application by the device for controlling rolling deviation of hot rolled strip is not described in detail here. The device adopted by the person skilled in the art to implement the method for controlling rolling deviation of hot-rolled strip steel in the first embodiment of the present application is all within the scope of protection of the present application.
EXAMPLE III
Based on the same inventive concept, the third embodiment of the present invention further provides a computer apparatus, as shown in fig. 4, including a memory 404, a processor 402, and a computer program stored in the memory 404 and operable on the processor 402, wherein the processor 402 executes the program to implement the steps of any one of the above-mentioned methods for controlling the rolling deviation of the hot-rolled strip.
Where in fig. 3 a bus architecture (represented by bus 400), bus 400 may include any number of interconnected buses and bridges, bus 400 linking together various circuits including one or more processors, represented by processor 402, and memory, represented by memory 404. The bus 400 may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. A bus interface 406 provides an interface between the bus 400 and the receiver 401 and transmitter 403. The receiver 401 and the transmitter 403 may be the same element, i.e., a transceiver, providing a means for communicating with various other apparatus over a transmission medium. The processor 402 is responsible for managing the bus 400 and general processing, while the memory 404 may be used for storing data used by the processor 402 in performing operations.
Example four
Based on the same inventive concept, a fourth embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, which when executed by a processor, implements the steps of any one of the methods of the method for controlling rolling deviation of hot strip described in the first embodiment.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A control method for rolling deviation of hot rolled strip steel is applied to a finishing mill group in a hot continuous rolling mill group, the finishing mill group comprises an F7 rolling mill, and the method is characterized by comprising the following steps:
controlling the head of the intermediate billet to pass through the F7 rolling mill within a first preset time so that the intermediate billet is stably placed in the finishing mill group;
after the first preset time, starting an automatic thickness control AGC system;
adjusting the AGC system to a first working mode, and controlling the finishing mill group to roll the intermediate billet based on the AGC system; wherein the first operating mode is for setting the F7 mill to a different amplitude than other mills located before the F7 mill;
when the rolling length of the intermediate billet is greater than the preset length, adjusting the AGC system to a second working mode, and controlling the finishing mill group to roll the intermediate billet based on the AGC system; wherein the second operating mode is for setting the amplitude of the F7 rolling mill to be the same as the amplitude of the other rolling mills.
2. The method of claim 1, wherein said controlling the head of the intermediate billet to pass through the F7 rolling mill for a first predetermined time further comprises:
detecting whether a rolling force exists in the F7 rolling mill by a first pressure head, wherein the first pressure head is arranged on the F7 rolling mill;
when the rolling force is detected, a timer is started.
3. The method of claim 2, wherein said adjusting said AGC system to a second operating mode when said rolled length of said intermediate billet is greater than a predetermined length and prior to controlling said finishing train to roll said intermediate billet based on said AGC system comprises:
acquiring the motor speed and the current timing time of the F7 rolling mill;
obtaining the rolling length of the intermediate billet according to the motor speed of the F7 rolling mill and the current timing time;
judging whether the rolling length is greater than the preset length;
and controlling the AGC system to keep the first working mode when the rolling length is not more than the preset length.
4. The method of claim 1, wherein the finishing mill train further comprises: an F5 rolling mill and an F6 rolling mill, the F5 rolling mill being disposed before the F6 rolling mill, the F6 rolling mill being disposed before the F7 rolling mill, the AGC system comprising: a first AGC disposed on the F7 mill, a second AGC disposed on the F6 mill, and a third AGC disposed on the F5 mill;
the adjusting the AGC system to a first mode of operation includes:
starting the first AGC, and setting the amplitude of the F7 rolling mill to be a first amplitude limit through the first AGC; the amplitude of the first amplitude limit is less than or equal to a first preset value, and the value range of the first preset value is 0.4-0.6 mm;
turning on the second AGC, and setting the amplitude of the F6 rolling mill to be a second amplitude limit through the second AGC; the amplitude of the second amplitude limit is less than or equal to a second preset value, and the value range of the second preset value is 0.6-0.8 mm;
turning on the third AGC, and setting the amplitude of the F5 rolling mill to be a third amplitude limit through the third AGC; and the amplitude of the third amplitude limit is less than or equal to a third preset value, and the value range of the third preset value is 0.9-1.1 mm.
5. The method of claim 4, wherein said adjusting said AGC system to a first operating mode and controlling said finishing train to roll said intermediate billet based on said AGC system comprises:
detecting rolling data by the first ram, a second ram, and a third ram, wherein the second ram is disposed on the F6 rolling mill and the third ram is disposed on the F5 rolling mill;
and rolling the intermediate billet according to the first amplitude limit, the second amplitude limit, the third amplitude limit and the rolling data.
6. The method of claim 5, wherein said adjusting said AGC system to a second mode of operation and controlling said finishing train to roll said intermediate billet based on said AGC system when a rolled length of said intermediate billet is greater than a predetermined length comprises:
when the rolling length of the intermediate billet is greater than the preset length, respectively setting the first amplitude limiting, the second amplitude limiting and the third amplitude limiting to be preset amplitudes through the first AGC, the second AGC and the third AGC, wherein the preset amplitudes are 2 mm;
and rolling the intermediate blank according to the set first amplitude limit, the second amplitude limit and the third amplitude limit to obtain the strip steel.
7. The method of claim 5, wherein the finishing mill train further comprises: a first loop and a second loop, the first loop disposed between the F6 rolling mill and the F7 rolling mill, the second loop disposed between the F5 rolling mill and the F6 rolling mill;
before the controlling the head of the intermediate billet to pass through the F7 rolling mill, the method further comprises the following steps:
detecting the rolling force of the F6 rolling mill through the second pressure head;
starting the second loop according to the rolling force of the F6 rolling mill;
detecting the rolling force of the F7 rolling mill through the first pressure head;
and starting the first loop according to the rolling force of the F7 rolling mill so as to keep the length of the steel strip stable during rolling.
8. The utility model provides a controlling means of hot rolling strip rolling off tracking, is applied to the finishing mill group, the finishing mill group includes: f7 rolling mill, characterized in that the device comprises:
a first module for controlling the head of the intermediate billet to pass through the F7 rolling mill for a first preset time to place the intermediate billet stably in the finishing train;
the second module is used for starting the automatic thickness control AGC system after the first preset time; adjusting the AGC system to a first working mode, and controlling the finishing mill group to roll the intermediate billet based on the AGC system; wherein the first operating mode is for setting the F7 mill to a different amplitude than other mills located before the F7 mill;
the third module is used for adjusting the AGC system to a second working mode when the rolling length of the intermediate billet is greater than the preset length, and controlling the finishing mill group to roll the intermediate billet based on the AGC system; wherein the second operating mode is for setting the amplitude of the F7 rolling mill to be the same as the amplitude of the other rolling mills.
9. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the method steps of any of claims 1-7 when executing the program.
10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the method steps of any one of claims 1 to 7.
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Cited By (1)
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| CN113828641A (en) * | 2021-11-22 | 2021-12-24 | 北京科技大学 | Method for processing deviation curve between frames of finish rolling strip steel based on machine vision |
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