CN110883101A - Method and device for controlling thickness of strip steel - Google Patents
Method and device for controlling thickness of strip steel Download PDFInfo
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- CN110883101A CN110883101A CN201911008987.0A CN201911008987A CN110883101A CN 110883101 A CN110883101 A CN 110883101A CN 201911008987 A CN201911008987 A CN 201911008987A CN 110883101 A CN110883101 A CN 110883101A
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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
- B21B37/16—Control of thickness, width, diameter or other transverse dimensions
- B21B37/18—Automatic gauge control
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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
- B21B37/16—Control of thickness, width, diameter or other transverse dimensions
- B21B37/165—Control of thickness, width, diameter or other transverse dimensions responsive mainly to the measured thickness of the product
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Abstract
The embodiment of the invention provides a method and a device for controlling the thickness of strip steel, wherein the method comprises the following steps: when the vehicle is lifted for 2-5 s, controlling an inlet thickness gauge at an inlet of the first machine frame to be in an opening state, and controlling the rolling force of the first machine frame to be-1000 kN; controlling a feed-forward thickness AGC control strategy of the first rack and a second flow thickness control strategy of the first rack to be started within 1-10 s from the starting time of the entrance thickness meter; controlling an outlet thickness gauge at an outlet of the first rack to be in an opening state within 100-200 s after the opening time of the inlet thickness gauge, and controlling a feedback thickness AGC control strategy of the first rack to be opened; therefore, in different time periods of the low-speed crawling stage of the strip steel, different control strategies are respectively utilized to adjust the roll gap of the first rack, the thickness of the strip steel is adjusted, the thickness of the strip steel can be controlled within a preset range, and the yield of strip steel products is improved.
Description
Technical Field
The invention relates to the technical field of steel rolling, in particular to a method and a device for controlling the thickness of strip steel.
Background
The double-frame temper mill is a machine set with the functions of temper rolling and secondary cold rolling. The double stand leveler can produce tin-plated substrates of extremely thin gauge, such as DR strip. In the rolling process, the thickness of the strip steel is an important quality index of a secondary cold-rolled product, and the product quality is seriously influenced by the thickness out-of-tolerance.
In the low-speed crawling stage of the strip steel in the prior art, no practical and effective means is provided for ensuring the thickness of the product, and the yield of the product is reduced.
Disclosure of Invention
Aiming at the problems in the prior art, the embodiment of the invention provides a method and a device for controlling the thickness of strip steel, which are used for solving the technical problem that the product thickness cannot be ensured in the low-speed crawling stage of the strip steel in the prior art, so that the yield of the product cannot be ensured.
The embodiment of the invention provides a method for controlling the thickness of strip steel, which is applied to a double-rack temper mill, wherein the double-rack temper mill comprises the following steps: a first frame and a second frame; the method comprises the following steps:
when the vehicle is lifted for 2-5 s, controlling an inlet thickness gauge at an inlet of the first rack to be in an opening state, and controlling the rolling force of the first rack to be-1000 kN;
controlling a feed-forward thickness automatic gain control strategy AGC of the first rack and a second flow thickness control strategy of the first rack to be started within 1-10 s from the starting time of the inlet thickness gauge so as to adjust the roll gap of the first rack;
and controlling an outlet thickness gauge at the outlet of the first rack to be in an opening state within 100-200 s after the opening time of the inlet thickness gauge, and controlling a feedback thickness AGC control strategy of the first rack to be opened so as to adjust the roll gap of the first rack.
In the above scheme, within 1 to 10 seconds after the inlet thickness gauge is opened, controlling the feed-forward thickness AGC control strategy of the first frame to open so as to adjust the roll gap of the first frame, includes:
and obtaining the thickness of the supplied materials at the inlet of the first rack within 1-10 s after the inlet thickness gauge is opened, and adjusting the roll gap of the first rack based on a feed-forward thickness AGC control model, the thickness of the supplied materials and a corresponding first target thickness.
In the above scheme, within 1 to 10s after the opening time of the inlet thickness gauge, controlling the feed-forward thickness second flow thickness control strategy of the first frame to open so as to adjust the roll gap of the first frame, includes:
and adjusting the roll gap of the first frame by using a preset second flow thickness difference control model according to the principle that the second flow of the outlet and the inlet of the first frame is equal within 1-10 s after the starting time of the inlet thickness gauge.
In the above scheme, the controlling the feedback thickness AGC control strategy of the first rack to be turned on within 100 to 200s after the start time of the inlet thickness gauge to adjust the roll gap of the first rack includes:
and within 100-200 s after the starting time of the inlet thickness gauge, the thickness of the strip steel at the outlet of the first rack is obtained, and the roll gap of the first rack is adjusted based on a feedback thickness AGC control model, the thickness at the outlet of the first rack and a corresponding second target thickness.
The embodiment of the invention also provides a device for controlling the thickness of strip steel, which is applied to a double-stand temper mill, wherein the double-stand temper mill comprises: a first frame and a second frame; the device comprises:
the first control unit is used for controlling the inlet thickness gauge at the inlet of the first frame to be in an opening state when the vehicle is lifted for 2-5 seconds;
the second control unit is used for controlling the rolling force of the first rack to be-1000 kN when the vehicle is started for 2-5 s;
the third control unit is used for controlling the feed-forward thickness AGC control strategy of the first rack and the second flow thickness control strategy of the first rack to be started within 1-10 s from the starting time of the inlet thickness gauge so as to adjust the roll gap of the first rack;
and the fourth control unit is used for controlling the outlet thickness gauge at the outlet of the first rack to be in an opening state within 100-200 s after the opening time of the inlet thickness gauge and controlling the feedback thickness AGC control strategy of the first rack to be opened so as to adjust the roll gap of the first rack.
In the foregoing solution, the third control unit is specifically configured to:
and obtaining the thickness of the supplied materials at the inlet of the first rack within 1-10 s after the inlet thickness gauge is opened, and adjusting the roll gap of the first rack based on a feed-forward thickness AGC control model, the thickness of the supplied materials and a corresponding first target thickness.
In the foregoing solution, the third control unit is specifically configured to:
and adjusting the roll gap of the first frame by using a preset second flow thickness difference control model according to the principle that the second flow of the outlet and the inlet of the first frame is equal within 1-10 s after the starting time of the inlet thickness gauge.
In the foregoing solution, the fourth control unit is specifically configured to:
and within 100-200 s after the starting time of the inlet thickness gauge, the thickness of the strip steel at the outlet of the first rack is obtained, and the roll gap of the first rack is adjusted based on a feedback thickness AGC control model, the thickness at the outlet of the first rack and a corresponding second target thickness.
The embodiment of the invention provides a method and a device for controlling the thickness of strip steel, wherein the method comprises the following steps: when the vehicle is lifted for 2-5 s, controlling an inlet thickness gauge at an inlet of the first rack to be in an opening state, and controlling the rolling force of the first rack to be-1000 kN; controlling a feed-forward thickness Automatic Gain Control (AGC) strategy of the first frame and a second flow thickness Control strategy of the first frame to be started within 1-10 s from the starting time of the inlet thickness gauge so as to adjust the roll gap of the first frame; controlling an outlet thickness gauge at an outlet of the first frame to be in an opening state within 100-200 s after the opening time of the inlet thickness gauge, and controlling a feedback thickness AGC control strategy of the first frame to be opened so as to adjust the roll gap of the first frame; therefore, in different time periods of the low-speed crawling stage of the strip steel, different control strategies are respectively utilized to adjust the roll gap of the first rack, and then the thickness of the strip steel is adjusted, so that the thickness of the strip steel can be controlled within a preset range, and the yield of strip steel products is improved.
Drawings
Fig. 1 is a schematic view of an overall structure of a two-stand temper mill provided in the prior art;
FIG. 2 is a schematic flow chart of a method for controlling the thickness of strip steel according to an embodiment of the present invention;
FIG. 3 is a schematic diagram showing the result of the device for controlling the thickness of strip steel according to the second embodiment of the present invention;
fig. 4 is a schematic diagram of the thickness of a DR strip in a low-speed crawling stage according to a third embodiment of the present invention.
Detailed Description
The technical problem that the yield of products cannot be ensured due to the fact that the thickness of the products cannot be ensured to be out of tolerance in the low-speed crawling stage of the strip steel due to working conditions in the prior art is solved. The embodiment of the invention provides a method and a device for controlling the thickness of strip steel, wherein the method comprises the following steps: when the vehicle is lifted for 2-5 s, controlling an inlet thickness gauge at an inlet of the first rack to be in an opening state, and controlling the rolling force of the first rack to be-1000 kN; controlling a feed-forward thickness AGC control strategy of the first rack and a second flow thickness control strategy of the first rack to be started within 1-10 s from the start of the inlet thickness gauge; and controlling the feedback thickness AGC control strategy of the first frame to be started within 100-200 s after the inlet thickness gauge is started.
The technical solution of the present invention is further described in detail by the accompanying drawings and the specific embodiments.
Example one
In order to clearly understand the method, the overall structure of the lower double-stand temper mill is described first. As shown in fig. 1, the double stand leveler includes: the device comprises an uncoiler 1, an inlet thickness gauge 2, a first frame F1 and a second frame F2; an outlet thickness gauge 3 and a coiling machine 4; the double-frame temper mill is subjected to the stages of starting, threading, low-speed crawling, speed increasing, high-speed production and speed reducing and stopping in the process of producing the strip steel. In the low-speed crawling stage, the thickness of the strip steel is uncontrollable, so that the thickness is not controllable due to the fact that the thickness is too poor. In order to avoid the above problem, the method provided by this embodiment, as shown in fig. 2, includes:
s110, when the vehicle starts for 2-5S, controlling an inlet thickness gauge at an inlet of the first rack to be in an opening state, and controlling the rolling force of the first rack to be-1000 kN;
when the car is lifted for 2-5 s, the inlet thickness gauge at the inlet of the first rack is controlled to be in an open state, so that the thickness of incoming materials at the inlet of the first rack can be measured by the inlet thickness gauge.
Of course, whether the inlet thickness gauge at the inlet of the first frame is controlled to be in an open state or not can be determined by judging the running speed of the strip steel. Specifically, when the running speed of the strip steel is less than 120m/min, the inlet thickness gauge at the inlet of the first machine frame can be controlled to be in an open state.
Meanwhile, the rolling force of the first rack is controlled to be-1000 kN.
S111, controlling a feed-forward thickness AGC control strategy of the first rack and a second flow thickness control strategy of the first rack to be started within 1-10S from the starting time of the inlet thickness meter so as to adjust the roll gap of the first rack;
and in the running process of the strip steel, controlling the feed-forward thickness AGC control strategy of the first frame and the second flow thickness control strategy of the first frame to be started within 1-10 s after the starting time of the inlet thickness meter so as to adjust the roll gap of the first frame.
Specifically, within 1-10 s after the inlet thickness gauge is opened, controlling the feed-forward thickness AGC control strategy of the first frame to be opened so as to adjust the roll gap of the first frame, including:
and obtaining the thickness of the supplied materials at the inlet of the first rack within 1-10 s after the inlet thickness gauge is opened, and adjusting the roll gap of the first rack according to the thickness of the supplied materials and the corresponding first target thickness based on a feedforward thickness AGC control model. Wherein the first target thickness is a thickness preset at the entrance of the first housing.
Here, the feed-forward thickness AGC control model is as shown in equation (1): the method comprises the following steps:
in the formula (1), CM is the strip steel plasticity coefficient; CG is the mill stiffness of the first stand; h0Is the inlet incoming material thickness; h is0△ S as a first target thicknessFFAnd the roll gap compensation value is fed forward thickness AGC.
And within 1-10 s after the distance from the inlet thickness gauge is opened, controlling the feed-forward thickness second flow thickness control strategy of the first rack to be opened so as to adjust the roll gap of the first rack, wherein the feed-forward thickness second flow thickness control strategy comprises the following steps:
and adjusting the roll gap of the first frame by using a preset second flow thickness difference control model according to the principle that the second flow of the outlet and the inlet of the first frame is equal within 1-10 s after the inlet thickness gauge is opened.
Here, the second flow thickness control model is as shown in equation (2):
in the formula (2), CM is the strip steel plasticity coefficient; CG is the mill stiffness of the first stand; v0Measuring the speed for the first machine frame inlet; h0Is the incoming material thickness; v1Measuring the speed for the first frame outlet; h is1△ S as a second target thicknessMFIs a second flow AGC roll gap compensation value. Wherein the second target thickness is a thickness preset at the exit of the first rack.
And S112, controlling an outlet thickness gauge at the outlet of the first rack to be in an opening state within 100-200S after the opening time of the inlet thickness gauge, and controlling a feedback thickness AGC control strategy of the first rack to be opened so as to adjust the roll gap of the first rack.
And finally, controlling an outlet thickness gauge at the outlet of the first rack to be in an opening state within 100-200 s after the opening time of the inlet thickness gauge so as to acquire the thickness of the strip steel at the outlet of the first rack by using the outlet thickness gauge, and controlling the feedback thickness AGC control strategy of the first rack to be opened so as to adjust the roll gap of the first rack.
Here, the controlling the feedback thickness AGC control strategy of the first frame to be turned on within 100 to 200s after the starting time of the inlet thickness gauge to adjust the roll gap of the first frame includes:
and acquiring the thickness of the strip steel at the outlet of the first rack, and adjusting the roll gap of the first rack based on a feedback thickness AGC control model, the thickness at the outlet of the first rack and a corresponding second target thickness.
Here, the feedback thickness AGC control model is as shown in equation (3):
in the formula (3), CM is the strip steel plasticity coefficient; CG is the mill stiffness of the first stand; h1The measured thickness at the outlet of the first rack; h is1△ S as a second target thicknessMNAnd feeding back a roll gap compensation value for thickness AGC.
Therefore, in the low-speed crawling stage of the strip steel, the roll gap of the first rack is adjusted through a feed-forward thickness AGC control strategy, a second flow thickness control strategy and a feedback thickness AGC control strategy, the thickness of the strip steel is further controlled, the control precision of the thickness of the strip steel can be ensured, the length of a thickness out-of-tolerance section is reduced, and the yield of products is improved.
Based on the same inventive concept, the invention also provides a device for controlling the thickness of the strip steel, and the details are shown in the second embodiment.
Example two
The present embodiment provides a device for controlling the thickness of a strip, as shown in fig. 3, the device includes: a first control unit 31, a second control unit 32, a third control unit 33, and a fourth control unit 34; wherein the content of the first and second substances,
the first control unit 31 is used for controlling the inlet thickness gauge at the inlet of the first rack to be in an open state when the vehicle is lifted for 2-5 s, so that the thickness of incoming materials at the inlet of the first rack can be measured by the inlet thickness gauge.
Of course, the first control unit 31 may also determine whether to control the inlet thickness gauge at the inlet of the first frame to be in the open state by judging the running speed of the strip steel. Specifically, when the running speed of the strip steel is less than 120m/min, the inlet thickness gauge at the inlet of the first machine frame can be controlled to be in an open state.
Meanwhile, the second control unit 32 controls the rolling force of the first frame to be-1000 to 1000 kN.
In the running process of the strip steel, within 1-10 s after the starting time of the inlet thickness gauge, the third control unit 33 controls the feed-forward thickness AGC control strategy of the first rack and the second flow thickness control strategy of the first rack to be started so as to adjust the roll gap of the first rack.
Specifically, within 1-10 s after the inlet thickness gauge is opened, controlling the feed-forward thickness AGC control strategy of the first frame to be opened so as to adjust the roll gap of the first frame, including:
and obtaining the thickness of the supplied materials at the inlet of the first rack within 1-10 s after the inlet thickness gauge is opened, and adjusting the roll gap of the first rack according to the thickness of the supplied materials and the corresponding first target thickness based on a feedforward thickness AGC control model. Wherein the first target thickness is a thickness preset at the entrance of the first housing.
Here, the feed-forward thickness AGC control model is as shown in equation (1): the method comprises the following steps:
in the formula (1), CM is the strip steel plasticity coefficient; CG is the mill stiffness of the first stand; h0Is the inlet incoming material thickness; h is0△ S as a first target thicknessFFAnd the roll gap compensation value is fed forward thickness AGC.
And within 1-10 s after the distance from the inlet thickness gauge to the inlet thickness gauge is opened, the third control unit 33 is used for: controlling a feed-forward thickness second flow thickness control strategy of the first frame to open to adjust a roll gap of the first frame, comprising:
and adjusting the roll gap of the first frame by using a preset second flow thickness difference control model according to the principle that the second flow of the outlet and the inlet of the first frame is equal within 1-10 s after the inlet thickness gauge is opened.
Here, the second flow thickness control model is as shown in equation (2):
in the formula (2), CM is the strip steel plasticity coefficient; CG is the mill stiffness of the first stand; v0Measuring the speed for the first machine frame inlet; h0To comeThe thickness of the material; v1Measuring the speed for the first frame outlet; h is1△ S as a second target thicknessMFIs a second flow AGC roll gap compensation value. Wherein the second target thickness is a thickness preset at the exit of the first rack.
Finally, within 100-200 s after the opening time of the inlet thickness gauge, the fourth control unit 34 is configured to: and controlling an outlet thickness gauge at the outlet of the first frame to be in an opening state so as to acquire the thickness of the strip steel at the outlet of the first frame by using the outlet thickness gauge, and controlling the feedback thickness AGC control strategy of the first frame to be opened so as to adjust the roll gap of the first frame.
Here, the controlling the feedback thickness AGC control strategy of the first frame to be turned on within 100 to 200s after the starting time of the inlet thickness gauge to adjust the roll gap of the first frame includes:
and acquiring the thickness of the strip steel at the outlet of the first rack, and adjusting the roll gap of the first rack based on a feedback thickness AGC control model, the thickness at the outlet of the first rack and a corresponding second target thickness.
Here, the feedback thickness AGC control model is as shown in equation (3):
in the formula (3), CM is the strip steel plasticity coefficient; CG is the mill stiffness of the first stand; h1The measured thickness at the outlet of the first rack; h is1△ S as a second target thicknessMNAnd feeding back a roll gap compensation value for thickness AGC.
Therefore, in the low-speed crawling stage of the strip steel, the roll gap of the first rack is adjusted through a feed-forward thickness AGC control strategy, a second flow thickness control strategy and a feedback thickness AGC control strategy, the thickness of the strip steel is further controlled, the control precision of the thickness of the strip steel can be ensured, the length of a thickness out-of-tolerance section is reduced, and the yield of products is improved.
The method and the device for controlling the thickness of the strip steel provided by the embodiment of the invention have the beneficial effects that at least:
the embodiment of the invention provides a method and a device for controlling the thickness of strip steel, wherein the method comprises the following steps: when the vehicle is lifted for 2-5 s, controlling an inlet thickness gauge at an inlet of the first rack to be in an opening state, and controlling the rolling force of the first rack to be-1000 kN; controlling a feed-forward thickness AGC control strategy of the first rack and a second flow thickness control strategy of the first rack to be started within 1-10 s from the starting time of the inlet thickness gauge so as to adjust the roll gap of the first rack; controlling an outlet thickness gauge at an outlet of the first frame to be in an opening state within 100-200 s after the opening time of the inlet thickness gauge, and controlling a feedback thickness AGC control strategy of the first frame to be opened so as to adjust the roll gap of the first frame; therefore, in different time periods of the low-speed crawling stage of the strip steel, different control strategies are respectively utilized to adjust the roll gap of the first rack, and then the thickness of the strip steel is adjusted, so that the thickness of the strip steel can be controlled within a preset range, and the yield of strip steel products is improved.
EXAMPLE III
In practical application, when the method provided by the first embodiment and the device provided by the second embodiment are used for producing DR material, referring to FIG. 4, the strip thickness out-of-tolerance length is greatly reduced from 150m to 60m in the low-speed crawling stage.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, and any modifications, equivalents, improvements, etc. that are within the spirit and principle of the present invention should be included in the present invention.
Claims (8)
1. A method for controlling the thickness of strip steel is characterized in that the method is applied to a double-frame temper mill, and the double-frame temper mill comprises the following steps: a first frame and a second frame; the method comprises the following steps:
when the vehicle is lifted for 2-5 s, controlling an inlet thickness gauge at an inlet of the first rack to be in an opening state, and controlling the rolling force of the first rack to be-1000 kN;
controlling a feed-forward thickness automatic gain control strategy AGC of the first rack and a second flow thickness control strategy of the first rack to be started within 1-10 s from the starting time of the inlet thickness gauge so as to adjust the roll gap of the first rack;
and controlling an outlet thickness gauge at the outlet of the first rack to be in an opening state within 100-200 s after the opening time of the inlet thickness gauge, and controlling a feedback thickness AGC control strategy of the first rack to be opened so as to adjust the roll gap of the first rack.
2. The method of claim 1, wherein controlling the feed forward thickness AGC control strategy of the first stand to be enabled within 1-10 s from the entry thickness gauge being enabled to adjust the roll gap of the first stand comprises:
and obtaining the thickness of the supplied materials at the inlet of the first rack within 1-10 s after the inlet thickness gauge is opened, and adjusting the roll gap of the first rack based on a feed-forward thickness AGC control model, the thickness of the supplied materials and a corresponding first target thickness.
3. The method of claim 1, wherein controlling the feed-forward thickness-second flow-thickness control strategy of the first stand to be enabled within 1-10 s from the time the inlet thickness gauge is enabled to adjust the roll gap of the first stand comprises:
and adjusting the roll gap of the first frame by using a preset second flow thickness difference control model according to the principle that the second flow of the outlet and the inlet of the first frame is equal within 1-10 s after the starting time of the inlet thickness gauge.
4. The method of claim 1, wherein controlling the feedback thickness AGC control strategy of the first frame to be enabled within 100-200 s from the time the inlet thickness gauge is enabled to adjust the roll gap of the first frame comprises:
and within 100-200 s after the starting time of the inlet thickness gauge, the thickness of the strip steel at the outlet of the first rack is obtained, and the roll gap of the first rack is adjusted based on a feedback thickness AGC control model, the thickness at the outlet of the first rack and a corresponding second target thickness.
5. The utility model provides a controlling means of belted steel thickness, its characterized in that uses in the two frame levelling machines, two frame levelling machines include: a first frame and a second frame; the device comprises:
the first control unit is used for controlling the inlet thickness gauge at the inlet of the first frame to be in an opening state when the vehicle is lifted for 2-5 seconds;
the second control unit is used for controlling the rolling force of the first rack to be-1000 kN when the vehicle is started for 2-5 s;
the third control unit is used for controlling the feed-forward thickness AGC control strategy of the first rack and the second flow thickness control strategy of the first rack to be started within 1-10 s from the starting time of the inlet thickness gauge so as to adjust the roll gap of the first rack;
and the fourth control unit is used for controlling the outlet thickness gauge at the outlet of the first rack to be in an opening state within 100-200 s after the opening time of the inlet thickness gauge and controlling the feedback thickness AGC control strategy of the first rack to be opened so as to adjust the roll gap of the first rack.
6. The apparatus of claim 5, wherein the third control unit is specifically configured to:
and obtaining the thickness of the supplied materials at the inlet of the first rack within 1-10 s after the inlet thickness gauge is opened, and adjusting the roll gap of the first rack based on a feed-forward thickness AGC control model, the thickness of the supplied materials and a corresponding first target thickness.
7. The apparatus of claim 5, wherein the third control unit is specifically configured to:
and adjusting the roll gap of the first frame by using a preset second flow thickness difference control model according to the principle that the second flow of the outlet and the inlet of the first frame is equal within 1-10 s after the starting time of the inlet thickness gauge.
8. The apparatus of claim 5, wherein the fourth control unit is specifically configured to:
and within 100-200 s after the starting time of the inlet thickness gauge, the thickness of the strip steel at the outlet of the first rack is obtained, and the roll gap of the first rack is adjusted based on a feedback thickness AGC control model, the thickness at the outlet of the first rack and a corresponding second target thickness.
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