CN112427463A - Roll gap compensation control method for inlet straightener of hot continuous rolling mill - Google Patents
Roll gap compensation control method for inlet straightener of hot continuous rolling mill Download PDFInfo
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- CN112427463A CN112427463A CN201910789207.4A CN201910789207A CN112427463A CN 112427463 A CN112427463 A CN 112427463A CN 201910789207 A CN201910789207 A CN 201910789207A CN 112427463 A CN112427463 A CN 112427463A
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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 discloses a roll gap compensation control method for an inlet straightener of a hot continuous rolling mill, which comprises the following steps of: 1) completing the zero adjustment of the frame; 2) calculating the deviation rolling force of the first frame; 3) roll gap deviation compensation control; 4) and (4) judging the roll gap deviation executing condition, if so, repeating the step 3), and if not, keeping the current roll gap position. The invention adopts the fluctuation of the rolling force deviation to measure and calculate the actual thickness change value of the incoming strip steel, compensates the roll gap setting of the straightener of the strip steel with the same specification, and optimizes the roll gap positioning control by using the periodic position deviation control to improve the current situation.
Description
Technical Field
The invention relates to a steel rolling automatic control technology, in particular to a roll gap compensation control method of a hot continuous rolling mill inlet straightener.
Background
The inlet straightener of the hot continuous rolling mill is mainly used for straightening the raised buckle state of an incoming material slab to enable the incoming material slab to be straightened so as to be safely and correctly put into use of a slab heater and an edge heater, so that the accurate control of the roll gap deviation of the inlet straightener of the hot continuous rolling mill is very important. Taking the original roll gap control of a finish rolling inlet straightener as an example, at present, the roll gap of the straightener is set and controlled by adding an experience adjustment amount to the target thickness of an incoming material, and the control mode has the defects of lack of change and accuracy and stable use of the function of the straightener. For example, when the straightening calibration roll gap has deviation, the thickness of the incoming strip steel has deviation at the same time, so that the roll gap of the straightening machine is smaller, and after the strip steel passes through the straightening machine, the head of the strip steel is upwarped, so that accidents are finally caused.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a roll gap compensation control method for an inlet straightener of a hot continuous rolling mill, which combines roll gap compensation of a finish rolling inlet straightener of a hot continuous rolling production line, adopts the fluctuation of rolling force deviation to measure and calculate the actual thickness change value of incoming strip steel, compensates the roll gap setting of the straightener of the strip steel with the same specification, and optimizes roll gap positioning control by using periodic position deviation control to improve the current situation.
In order to achieve the purpose, the invention adopts the following technical scheme:
a roll gap compensation control method for an inlet straightener of a hot continuous rolling mill comprises the following steps:
1) completing the zero adjustment of the frame;
2) calculating the deviation rolling force of the first frame;
3) roll gap deviation compensation control;
4) and (4) judging the roll gap deviation executing condition, if so, repeating the step 3), and if not, keeping the current roll gap position.
And the roll gap deviation compensation control comprises incoming strip steel thickness deviation calculation, period mean value compensation control and roll gap deviation compensation quantity control.
The thickness deviation calculation of the incoming strip steel is as follows:
the preset roll gap value is S0The rigidity coefficient of the rolling mill is M, and the thickness of the supplied material is H0At a rolling pressure of P1Then the actual rolling thickness h1The method comprises the following steps:
when the thickness or temperature of the incoming material changes for some reason, the change of the rolling pressure and the rolling thickness is inevitably caused in the rolling process, if the pressure is changed from P1Is changed into P2Then rolling to a thickness h2Comprises the following steps:
when the rolling pressure is from P1Is changed into P2And then, the thickness deviation delta h of the rolled thickness is just equal to the spring amount caused by the pressure difference:
the calculation formula of the period mean value compensation control is as follows:
in the above formula, Δ h' is the mean value of roll gap deviation of the sampling period, h1Roll gap deviation value, h, calculated for the first sampling period2Roll gap deviation value calculated for the second sampling period, hnRoll gap deviation values calculated for the nth sampling period.
The roll gap deviation compensation quantity is controlled by using the rolling force deviation to convert the fluctuation of the thickness of the strip steel as the compensation setting of the roll gap of the straightener:
H＝Δh'+h+θ
in the above formula, H is set for the opening of the roll gap of the straightener, Δ H' is the mean value of the roll gap deviation in the sampling period, and θ is the empirical margin value.
And judging the executing condition of the roll gap deviation, wherein the change quantity of the roll gap of the periodical scanning straightener is used as the judgment of whether the roll gap is static or not, and the formula is as follows:
ΔL＝|ΔL1-ΔL2|
when deltaL< β, indicating that it is in a resting state;
in the above formula,. DELTA.LFor a difference of data values, Δ, of two scanning periodsL1For scanning data for the current period, ΔL2For the last cycle of scanning data, beta is two adjacent real-time samplesThe deviation amount of the roll gap position for each sampling period.
The value range of the beta is 0.01-0.05 mm.
And 5), controlling the action of the roll gap, specifically comprising linear positioning control, arc positioning control and control of the switching time point of the two control actions.
The linear positioning control is that according to the linear action: k × Δ x
In the above formula, v is a speed set value, Δ x is a position deviation, and K is a linear control slope corresponding to the response speed;
the arc positioning control is that according to the arc action:
in the above formula, v is a speed set value, α is a curve radian coefficient, Δ x is a position deviation, a value range is 3-5 mm, and Δ xoo is a position deviation of not more than 5mm when linear control is performed.
The two control actions are controlled by switching time points, and the control mode of the switching point delta xo is as follows:
the invention provides a roll gap compensation control method of a hot continuous rolling mill inlet straightener, which combines roll gap compensation of a hot continuous rolling production line finish rolling inlet straightener, adopts fluctuation of rolling force deviation to measure and calculate the actual thickness change value of incoming strip steel, compensates roll gap setting of the straightener of the strip steel with the same specification, and optimizes roll gap positioning control by using periodic position deviation control to improve the current situation.
Drawings
FIG. 1 is a flow chart of a compensation control method of the present invention;
FIG. 2 is a schematic diagram of the incoming strip thickness deviation calculation in the compensation control method of the present invention;
FIG. 3 is a schematic diagram of the control of the switching time point of two control actions in the compensation control method of the present invention.
Detailed Description
The technical scheme of the invention is further explained by combining the drawings and the embodiment.
Referring to fig. 1, the method for controlling roll gap compensation of an inlet leveler of a hot continuous rolling mill provided by the present invention includes the following steps:
1) the zero adjustment of the frame is finished, and the zero adjustment finishing signal is used for judging the switching of rolling varieties;
2) calculating the rolling force deviation of the first frame by combining the frame steel biting signal
And (6) performing calculation. Namely combining the steel biting signal of the F2 stand, comparing the target rolling force and the actual rolling force of the F1 stand, and recording the deviation of the rolling force of the current stand
3) Roll gap deviation compensation control;
3.1) calculating the thickness deviation of incoming strip steel, which comprises the following steps:
the preset roll gap value is S0The rigidity coefficient of the rolling mill is M, and the thickness of the supplied material is H0At a rolling pressure of P1As shown in fig. 2, the thickness h is actually rolled1The method comprises the following steps:
when the thickness or temperature of the incoming material changes for some reason, the change of the rolling pressure and the rolling thickness is inevitably caused in the rolling process, if the pressure is changed from P1Is changed into P2Then rolling to a thickness h2Comprises the following steps:
when the rolling pressure is from P1Become intoP2And then, the thickness deviation delta h of the rolled thickness is just equal to the spring amount caused by the pressure difference:
3.2) periodic mean value compensation control, in order to pursue more accurate roll gap opening compensation, mean value supplement control is adopted in the same rolling plan, and the calculation formula is as follows:
in the above formula, Δ h' is the mean value of roll gap deviation of the sampling period, h1Roll gap deviation value, h, calculated for the first sampling period2Roll gap deviation value calculated for the second sampling period, hnRoll gap deviation values calculated for the nth sampling period.
3.3) controlling the roll gap deviation compensation quantity, namely, using the roll force deviation to convert the fluctuation of the thickness of the strip steel as the compensation setting of the roll gap of the straightener:
H＝Δh'+h+θ
in the above formula, H is set for the opening of the roll gap of the straightener, Δ H' is the mean value of the roll gap deviation in the sampling period, and θ is the empirical margin value.
4) Judging the executing condition of the roll gap deviation control of the straightening machine, if the roll gap of the straightening machine is in an action state, blocking the executing command of the newly set action, and ensuring that the executing command can be received by a control mechanism of the roll gap action of the straightening machine in a static state. The invention judges whether the roll gap of the straightener is static or not by periodically scanning the variable quantity of the roll gap of the straightener, and the formula is as follows:
ΔL＝|ΔL1-ΔL2|
when deltaLIf the beta is less than beta, the static state is shown, and the value range of the beta is 0.01-0.05 mm.
In the above formula,. DELTA.LFor a difference of data values, Δ, of two scanning periodsL1For scanning data for the current period, ΔL2Is the last oneAnd (4) periodically scanning data, wherein beta is the deviation amount of the roll gap positions of two adjacent sampling periods sampled in real time.
In the embodiment, the combined program scanning period is 50ms, so that the stroke of the oil cylinder in one scanning period is 1.5mm, and the change of the scanning data of the two programs before and after being utilized is less than 0.1mm, so that the oil cylinder is considered to be in the in-place static state.
Δ'L＝ΔL1-ΔL2
When deltaL< 0.01mm, this indicates that the apparatus is in a static state.
5) And in order to quickly realize the execution action after accurate and effective setting, a new action scheme is designed to replace the original action scheme. The control of the new scheme is mainly embodied in the following two parts:
5.1) the linear positioning control is that according to the linear action: k × Δ x
In the above formula, v is a speed set value, Δ x is a position deviation, and K is a linear control slope corresponding to the response speed;
5.2) the arc positioning control is that according to the arc action:
in the above formula, v is a speed set value, α is a curve radian coefficient, Δ x is a position deviation, a value range is 3-5 mm, and Δ xoo is a position deviation of not more than 5mm when linear control is performed.
5.3) controlling the switching time point of the two control actions, as shown in fig. 3, the control mode of the switching point Δ xo is as follows:
the specific calculation method is as follows:
square on both sides to obtain
K2×Δx2＝2×α×(Δx-Δxoo)
Moving the item to obtain
K2×Δx2-2×α×Δx+2×α×Δxoo＝0
Solving to obtain
Since only one intersection point of the two curves is required, the discriminant Δ is 0, so
4×α2＝8×K2×α×Δxoo
Solving to obtain
Further, obtain
In summary, the compensation control method of the present invention relates to using a thickness variation value caused by a variation in rolling force deviation of a rolling mill to compensate roll gap settings of a straightener for other strip steels of the same specification, and optimizing roll gap positioning control using periodic position deviation control.
It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that changes and modifications to the above described embodiments are within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.
Claims (10)
1. A roll gap compensation control method for an inlet straightener of a hot continuous rolling mill is characterized by comprising the following steps: the method comprises the following steps:
1) completing the zero adjustment of the frame;
2) calculating the deviation rolling force of the first frame;
3) roll gap deviation compensation control;
4) and (4) judging the roll gap deviation executing condition, if so, repeating the step 3), and if not, keeping the current roll gap position.
2. The roll gap compensation control method of the inlet straightener of the hot continuous rolling mill as claimed in claim 1, characterized in that: and the roll gap deviation compensation control comprises incoming strip steel thickness deviation calculation, period mean value compensation control and roll gap deviation compensation quantity control.
3. The roll gap compensation control method of the inlet straightener of the hot continuous rolling mill as claimed in claim 2, characterized in that: the thickness deviation calculation of the incoming strip steel is as follows:
the preset roll gap value is S0The rigidity coefficient of the rolling mill is M, and the thickness of the supplied material is H0At a rolling pressure of P1Then the actual rolling thickness h1The method comprises the following steps:
when the thickness or temperature of the incoming material changes for some reason, the change of the rolling pressure and the rolling thickness is inevitably caused in the rolling process, if the pressure is changed from P1Is changed into P2Then rolling to a thickness h2Comprises the following steps:
when the rolling pressure is from P1Is changed into P2And then, the thickness deviation delta h of the rolled thickness is just equal to the spring amount caused by the pressure difference:
4. the roll gap compensation control method of the inlet straightener of the hot continuous rolling mill as claimed in claim 3, characterized in that: the calculation formula of the period mean value compensation control is as follows:
in the above formula, Δ h' is the mean value of roll gap deviation of the sampling period, h1Roll gap deviation value, h, calculated for the first sampling period2Roll gap deviation value calculated for the second sampling period, hnRoll gap deviation values calculated for the nth sampling period.
5. The roll gap compensation control method of the inlet straightener of the hot continuous rolling mill as claimed in claim 4, characterized in that: the roll gap deviation compensation quantity is controlled by using the rolling force deviation to convert the fluctuation of the thickness of the strip steel as the compensation setting of the roll gap of the straightener:
H＝Δh'+h+θ
in the above formula, H is set for the opening of the roll gap of the straightener, Δ H' is the mean value of the roll gap deviation in the sampling period, and θ is the empirical margin value.
6. The roll gap compensation control method of the inlet straightener of the hot continuous rolling mill as claimed in claim 1, characterized in that: and judging the executing condition of the roll gap deviation, wherein the change quantity of the roll gap of the periodical scanning straightener is used as the judgment of whether the roll gap is static or not, and the formula is as follows:
ΔL＝|ΔL1-ΔL2|
when deltaL< β, indicating that it is in a resting state;
in the above formula,. DELTA.LFor a difference of data values, Δ, of two scanning periodsL1For scanning data for the current period, ΔL2And beta is the deviation value of the roll gap positions of two adjacent sampling periods sampled in real time, wherein the scanning data is the scanning data of the previous period.
7. The roll gap compensation control method of the inlet straightener of the hot continuous rolling mill as claimed in claim 6, characterized in that: the value range of the beta is 0.01-0.05 mm.
8. The roll gap compensation control method of the inlet straightener of the hot continuous rolling mill as claimed in claim 1, characterized in that: and 5), controlling the action of the roll gap, specifically comprising linear positioning control, arc positioning control and control of the switching time point of the two control actions.
9. The roll gap compensation control method for the inlet straightener of the hot continuous rolling mill as claimed in claim 8, characterized in that: the linear positioning control is that according to the linear action: k × Δ x
In the above formula, v is a speed set value, Δ x is a position deviation, and K is a linear control slope corresponding to the response speed;
the arc positioning control is that according to the arc action:
in the above formula, v is a speed set value, α is a curve radian coefficient, Δ x is a position deviation, a value range is 3-5 mm, and Δ xoo is a position deviation of not more than 5mm when linear control is performed.
10. The roll gap compensation control method for the inlet straightener of the hot continuous rolling mill as claimed in claim 9, characterized in that: the two control actions are controlled by switching time points, and the control mode of the switching point delta xo is as follows:
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113941606A (en) * | 2021-09-26 | 2022-01-18 | 中冶南方工程技术有限公司 | Small-time lag control method for cold-rolling full-hydraulic multi-roller straightening roll gap |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113941606A (en) * | 2021-09-26 | 2022-01-18 | 中冶南方工程技术有限公司 | Small-time lag control method for cold-rolling full-hydraulic multi-roller straightening roll gap |
| CN113941606B (en) * | 2021-09-26 | 2023-05-26 | 中冶南方工程技术有限公司 | Time lag control method for cold rolling full-hydraulic multi-roller straightening roll gap |
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