CN108602098B - Strip steel shape correcting device and method - Google Patents
Strip steel shape correcting device and method Download PDFInfo
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- CN108602098B CN108602098B CN201680075451.9A CN201680075451A CN108602098B CN 108602098 B CN108602098 B CN 108602098B CN 201680075451 A CN201680075451 A CN 201680075451A CN 108602098 B CN108602098 B CN 108602098B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
- B21B38/02—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring flatness or profile of strips
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Abstract
The present invention relates to a strip shape correction device which is arranged on the inlet side of a mandrel for rolling hot-rolled strip steel and corrects the shape of the strip steel, and the device comprises: a first shape measuring unit that measures the shape of the strip steel supplied to the entry side of the mandrel; a shape correction unit that corrects the shape of the strip by pressing a pinch roller configured to press the strip with a set target pressing force such that the shape of the strip measured by the first shape measurement unit is corrected to a target shape according to an elongation based on the pressing force and the tension of the strip; a second shape measuring unit that measures the shape of the strip steel corrected by the shape correcting unit; and a shape correcting section that corrects the target pressing force by controlling the pressing force and the tension of the strip steel by the shape correcting section so that the shape of the strip steel measured by the second shape measuring section corresponds to the target shape.
Description
Technical Field
The present invention relates to an improved strip shape straightening device for finishing strip shape straightening in a hot rolling process.
Background
Referring to fig. 1, in general, a hot rolling process 10 is a process of producing a steel strip S having a desired thickness to be rolled by moving the steel strip S maintained at a predetermined temperature or higher and performing a plurality of rolling.
In this hot rolling process 10, the strip S having passed through the finishing mill 12 is supplied to the cooling zone 14, and the cooling water is directly discharged from the cooling zone 14 to produce a predetermined temperature, whereby desired properties of the strip S can be secured.
The strip S passing through the cooling zone 14 is tensioned by the coiler pinch rolls 16, and is wound around the mandrel 18 by the coiler pinch rolls 16.
In addition, the strip S has a slight shape difference during the hot rolling process, and the strip S wound around the mandrel 18 needs to be subjected to a process of correcting its shape.
Therefore, in the conventional technique, the strip S is wound around the mandrel 18 in a rolled state, moved to the additional shape correcting process 30 for correcting the shape of the strip S, and then the shape of the strip S is corrected.
The conventional shape correcting process 30 includes a double process of transferring a rolled sheet to a correcting process as a post process for the rolled sheet, re-spreading the sheet, and rolling again by the rolling mill 32 to correct the shape.
However, the conventional shape correcting process 30 requires an additional process line and increases the facility cost, and thus requires a space to be secured, and because the strip S wound in a rolled shape needs to be newly unwound and corrected, the processing cost increases, and the productivity decreases.
In particular, in the conventional shape correcting process 30, when a soft reduction rolling mill is not used, a roll leveler (roller leveler) is used, which uses a plurality of rolls and further requires equipment cost and installation space, thereby causing a spatial limitation, and the strip S needs to pass through a plurality of rolls and causes a problem in high-speed operation because the movement direction of the strip S is obstructed.
Disclosure of Invention
Technical problem to be solved
An object of an embodiment of the present invention is to provide a strip shape correcting apparatus and method thereof, which enable a process of correcting a shape of a strip to be continuously performed in a hot rolling process.
(II) technical scheme
A strip shape correcting apparatus according to an aspect of the present invention is an apparatus that is provided on an entry side of a mandrel that winds a hot-rolled strip and corrects a shape of the strip, the apparatus including: a first shape measuring unit that measures the shape of the strip steel supplied to the entry side of the mandrel; a shape correction unit that corrects the shape of the strip by pressing a pinch roller configured to press the strip with a set target pressing force such that the shape of the strip measured by the first shape measurement unit is corrected to the target shape of the strip according to an elongation based on the pressing force and the tension of the strip; a second shape measuring unit that measures the shape of the strip steel corrected by the shape correcting unit; and a shape correcting section that corrects the target pressing force by controlling the pressing force and the tension of the strip steel by the shape correcting section so that the shape of the strip steel measured by the second shape measuring section corresponds to the target shape.
And, the shape correcting part may include: a pressure measuring sensor for measuring a pressing force for pressing the strip steel; a tension measuring sensor for measuring the tension of the strip steel which is pressed by the press roller and moves; and a control unit for setting a target pressing force by using the pressure measuring sensor and the tension measuring sensor, and controlling the strip steel to be pressed by the target pressing force.
Wherein the tension measuring sensor may comprise a torque sensor.
And, the press-down roller may include: at least one vertical press roller which is arranged in a pair in an upper part and a lower part of the strip steel in a manner of facing each other, and is used for pressing the transferred strip steel; and at least one width direction pinch roller which is arranged in a pair in an opposite manner in the width direction of the strip steel.
In the shape correcting portion, a load of the press roller pressing the strip in the up-down direction is 300 to 1000 tons, a load of the press roller pressing the shape in the width direction of the strip is 50 to 200 tons, and an elongation of the strip may be 0 to 4%.
Also, a strip shape correcting method according to another aspect of the present invention is a strip shape correcting method of a hot rolling process of correcting a shape of a strip in a process of rolling up the hot rolled strip, the method including: a first measuring step of measuring the shape of the strip steel at the inlet side of a mandrel for winding the strip steel; a target pressing force setting step of setting a target pressing force for correcting the shape of the strip steel measured in the first measuring step into a target shape of the strip steel according to an elongation based on the pressing force and the tension of the strip steel; a shape correcting step of applying the target pressing force set in the target pressing force setting step to the strip steel to correct a shape; a second measuring step of measuring a shape of the strip steel corrected in the shape correcting step; and a shape correcting step of controlling the pressing force and the tension to the strip steel to correct the target pressing force of the shape correcting step so that the shape of the strip steel measured in the second measuring step corresponds to the target shape.
Also, the target depressing force setting step may include: an elongation calculation step of deriving a maximum elongation for shape correction from a difference between a maximum value and a minimum value among the flatness measurement values of the respective width sections measured in the first measurement step; a maximum extension difference tension correcting step of measuring a tension generated on the strip steel, dividing the measured tension by a material elastic coefficient of the strip steel to correct the tension, and adding the maximum extension difference tension to the corrected maximum extension difference tension; a target elongation setting step of setting a target elongation corresponding to the maximum elongation difference so as to be able to cancel the maximum elongation difference corrected in the maximum elongation difference tension correcting step; and a target pressing force calculation step of setting a target pressing force set value by using a light pressing model so as to obtain the target elongation set in the target elongation setting step.
And, the shape correcting step may include: a shape comparison step of comparing the shape of the corrected strip steel measured in the second measurement step with a target shape, and judging whether correction of the target pressing force is required; a tension correcting step of correcting the tension generated in the strip steel so that the target pressing force of the target pressing force setting step is corrected, in order to cancel out the compared shape difference, when it is determined that the correction is necessary in the shape comparing step; and a target pressing force correcting step of correcting the elongation in each width section by using the tension corrected in the tension correcting step so that the target pressing force in the shape correcting step is corrected, and correcting a value for canceling the corrected elongation by using the target pressing force.
Also, the target pressing force corrected in the shape correcting step may satisfy the following equation.
The mathematical formula is as follows:
wherein, FnThe pressing force of the nth width interval is shown, △ FnA value for correcting the pressing force, f, indicating the nth width intervalR(F) Is a function of the elongation to the depression force (F) calculated by the soft-reduction model, YavgDenotes the average elongation, Y, over the entire width intervalnThe elongation of the nth width interval is shown.
(III) advantageous effects
According to an embodiment of the present invention, the process of straightening the strip is continuously performed at one time after the hot rolling process of the strip, so that an additional process for straightening the strip is not required and the operation time can be reduced and the productivity can be improved, thereby contributing to a reduction in the overall cost.
Drawings
Fig. 1 is a structural view schematically showing a process of straightening a strip steel after a conventional hot rolling process.
Fig. 2 is a structural view showing a strip shape correcting apparatus according to an embodiment of the present invention.
Fig. 3 is a structural view showing a strip shape correcting apparatus according to another embodiment of the present invention.
Fig. 4 is a flowchart illustrating a strip shape correcting method according to another embodiment of the present invention.
Fig. 5 is a flowchart showing a target pressing force setting step of a strip shape correcting method according to another embodiment of the present invention.
Fig. 6 is a flowchart showing a shape correcting step of a strip shape correcting method according to another embodiment of the present invention.
Best mode for carrying out the invention
An embodiment of the present invention will be described in detail below with reference to the drawings. The embodiment of the present invention may be modified into other various embodiments, and the scope of the present invention is not limited to the embodiments described below. For more specific description, the shapes, sizes, and the like of the components in the drawings may be exaggerated and the components denoted by the same reference numerals in the drawings are the same components.
Fig. 2 is a structural view showing a strip shape correcting apparatus according to an embodiment of the present invention.
Referring to fig. 2, the strip shape correcting apparatus 150 of the hot rolling process of the present embodiment may be provided in the hot rolling process 100 of the strip.
In the hot rolling process 100, the strip S passing through the finishing mill 112 is supplied to the cooling zone 114, and the cooling water is directly flowed out in the cooling zone 114 to have a predetermined temperature, whereby desired properties of the strip S can be secured.
The strip S having passed through the cooling zone 114 is shape-corrected by the shape correction unit 160 of the strip shape correction device 150 of the present embodiment, specifically, by being pressed down by the press-down roller 164, and is finally wound around the mandrel 118.
The strip shape correcting apparatus 150 of the hot rolling process of the present embodiment may include: a first shape measuring unit 152, a shape correcting unit 160, a second shape measuring unit 154, and a shape correcting unit.
The first shape measuring unit 152 may be provided on the entry side of the mandrel 118 for winding the hot-rolled strip S, and may measure the waviness of the strip S passing through the finishing mill 112 and the cooling zone 114, thereby measuring the shape of the strip S in the entire width direction.
The shape correcting unit 160 may be provided at the rear end of the first shape measuring unit 152, and may correct the shape of the strip S to a target shape by pressurizing the strip S with a target pressing force set in consideration of the pressing force and the tension of the strip S, based on the shape of the strip S measured by the first shape measuring unit 152.
Specifically, the shape correcting unit 160 calculates the minimum elongation required for correcting the shape based on the information of the strip S measured by the first shape measuring unit 152, and for this purpose, controls the pressing force required for correcting the shape of the strip S and the tension generated in the strip S, thereby making it possible to adjust the elongation required for shape change and correct the shape of the strip S using this.
To this end, the shape correction device 160 may include: a pressure measuring sensor for measuring a pressing force for pressing the strip steel S; and a tension measuring sensor 156 for measuring the tension of the strip S.
For example, the tension measuring sensor 156 may be a torque sensor that measures the torque of the mandrel 118 and uses this to estimate the tension. The torque sensor measures the torque generated during the pressing of the strip S by the press roll and can use this to estimate the tension generated on the strip S. Preferably, the tension measuring sensor 156 estimates the tension using the torque sensor, and the tension measured by the torque sensor may be corrected using the elastic coefficient of the material.
The shape correcting section 160 may include a control section 162 capable of adjusting the elongation actually given to the strip S so as to obtain a target elongation for correcting the shape of the strip S in consideration of the pressing force for pressing the strip S measured by the pressure measuring sensor and the tension applied to the strip S measured by the tension measuring sensor 156, and using this to control the pressing force so that the shape correcting section 160 presses the strip S at the target pressing force.
The shape correcting portion may include at least one vertical pressing roller 164 which is disposed in a pair so that upper and lower portions of the strip S face each other, and which pressurizes the moving strip S, and the load of pressurizing the strip S may be controlled by the control portion 162 by the vertical pressing roller 164.
Also, the shape correcting portion 160 may include width-direction pinch rollers, in addition to the upper and lower pinch rollers 164, provided on both sides (not shown) in the width direction of the strip S to control the width-direction shape of the strip S.
For example, in the present embodiment, the load of the pressing roller 164 in the shape correction portion 160, specifically, the up-down direction pressing roller 164 pressing the strip S up and down may be 300 tons to 1000 tons.
Further, it is preferable that, in the present embodiment, the load of the shape correction portion 160 with respect to the pinch rolls 164, specifically, the widthwise pinch rolls that pinch the strip S in the width direction may be 50 tons to 200 tons.
As described above, the shape correction unit 160 can correct the shape of the strip S by the vertical and lateral pinch rolls 164 and the width pinch rolls, and the elongation of the strip S can be controlled to 0 to 4%.
Further, the shape correcting unit 160 may be provided at a rear end thereof with a second shape measuring unit 154 that measures the shape of the corrected strip S before being wound around the mandrel 118.
The second shape measuring unit 154 can measure the waviness of the strip S corrected by the shape correcting unit 160, thereby measuring the shape of the strip S in the entire width direction.
Then, after the second shape measuring unit 154 measures the shape of the corrected strip S, the shape correcting unit can correct the target rolling reduction rate of the shape correcting unit.
The shape correcting portion may be a control portion 162 that determines whether the shape of the corrected strip S measured by the second shape measuring portion 154 corresponds to the target shape, and controls the pressing force and the tension of the shape correcting portion 160 on the strip S based on this, thereby correcting the target pressing force. The control unit 162 of the shape correction unit may be provided separately or used in common with the control unit 162 of the shape correction unit.
Also, the shape correcting portion may include a vertical direction press-down roller 164 which presses down the strip S by the control portion 162, wherein the vertical direction press-down roller 164 may be provided at a rear end of the second shape measuring portion 154, and preferably, the shape of the strip S may be corrected by the vertical direction press-down roller 164 of the shape correcting portion 160.
The target pressing force corrected by the shape correcting unit is transmitted to the shape correcting unit 160 again, and the pressing force continuously applied to the strip S is corrected.
The vertical direction press roll 164 provided in the shape correction unit 160 described in the present embodiment is provided on the entry side of the mandrel 118 in the hot rolling process and functions as a coiler nip roll that guides the strip to be wound and generates tension.
Fig. 3 is a structural view showing a strip shape correcting apparatus according to another embodiment of the present invention.
For example, referring to fig. 3, in the hot rolling process 100, the exit side of the cooling zone 114 may be provided with an additional zero pinch roll (zeropinch roll)115 and the entry side of the mandrel 118 may be provided with an additional coiler pinch roll 116.
Further, the shape correcting unit 160 of the present embodiment may be provided between the zero pinch roll 115 and the coiler pinch roll 116 to correct the strip S.
Specifically, the shape correcting portion 160 includes a vertical direction press-down roller 164 that presses down the strip S for correction between the zero pinch roller 115 and the coiler pinch roller 116, and the first shape measuring portion 152 and the second shape measuring portion 154 may be provided between the zero pinch roller 115 and the press-down roller 164, and between the press-down roller 164 and the coiler pinch roller 116.
Next, a method of correcting the shape of the strip using the strip shape correcting apparatus having the above-described configuration will be described.
Fig. 4 is a flowchart illustrating a strip shape correcting method according to another embodiment of the present invention.
Referring to fig. 4, the strip shape correcting method of the hot rolling process 100 of the present embodiment may include: a first measurement step S10, a target pressing force setting step S20, a shape correction step S30, a second measurement step S40, and a shape correction step S50.
The first measuring step S10 is a step of measuring the shape of the strip S at the entry side of the mandrel 118 that winds the strip S passing through the finishing mill 112 and the cooling zone 114 in the hot rolling process 100. In the first measurement step S10, the shape information of the strip S that needs to be corrected before being wound around the mandrel 118 can be measured, and the flatness of the strip S can be calculated using the information.
The target pressing force setting step S20 is a step of setting a target pressing force for correcting the shape of the strip S measured in the first measuring step S10 to a target shape, and the target pressing force can be set according to an elongation based on the pressing force and the tension of the strip S.
Next, the target pressing force setting step S20 in the present embodiment will be specifically described.
Fig. 5 is a flowchart showing a target pressing force setting step of a strip shape correcting method according to another embodiment of the present invention.
Referring to fig. 5, the flatness of the strip S calculated using the shape information of the strip S measured in the aforementioned first measurement step S10 physically represents the ratio of the actual steel sheet length to the straight line length in the steel sheet moving direction.
Therefore, in the target pressing force setting step S20, it is necessary to perform the elongation calculation step S21 for deriving the maximum elongation. That is, as shown in mathematical expression 1, if the difference between the maximum value and the minimum value among the flatness measurement values for each width section measured in the first measurement step S10 can be known, the maximum elongation for performing shape correction can be derived.
[ mathematical formula 1]
Maximum elongation (%) { maximum value (MAX) (flatness in each width interval) -minimum value (min) (flatness in each width interval) } × 10-3。
Next, after the maximum elongation is derived, a maximum elongation difference tension correcting step S22 of correcting the maximum elongation so as to reflect the elongation by tension using the elongation is possible.
In the maximum extension difference tension correcting step S22, the tension generated in the strip S is measured, the measured tension is divided by the material elastic coefficient of the strip S to correct the tension, and the corrected tension is added to the maximum extension difference tension, so that the maximum extension difference tension can be corrected.
At this time, the tension generated in the strip S can be estimated from the torque generated when the pinch rolls 164 of the shape correction portion are activated, and thereby the elastic deformation in the longitudinal direction of the strip S can be predicted. The longitudinal elastic deformation of the strip S may be simply calculated in proportion to the elastic coefficient and the tension of the strip S, or the tensile-strength curve (tensile-strength curve) of the strip S may be used to predict the elastic deformation other than the plastic deformation. Since the difference in elongation below the elastic deformation is masked by the elastic deformation due to the tension, the maximum difference in elongation can be corrected by adding the calculated maximum difference in elongation for each width section to the elastic deformation estimated from the tension, as shown in mathematical expression 2.
[ mathematical formula 2]
After the maximum extension difference tension correcting step S22 is completed, a target extension setting step S23 of setting a target extension based on the maximum extension difference corrected in the maximum extension difference tension correcting step S22 may be performed. In the target elongation setting step S23, a value appropriately larger than the corrected maximum elongation difference may be set as the target elongation to cancel the corrected maximum elongation difference. Preferably, the target elongation may be set to a value corresponding to the maximum elongation difference.
Next, after the target elongation is set, a target pressing force calculation step S24 of calculating a target pressing force set value using the light-pressing model may be performed.
After the target pressing force is set through the above-described procedure, the shape correction step S30 is performed to pressurize the strip S at the set target pressing force, thereby correcting the shape.
In addition, in the shape correcting step S30, the actual corrected shape of the strip S is compared with the target shape, and when the corrected actual shape differs from the target shape, feedback is necessary to perform correction so that the shape correction performed according to the target pressing force follows the actual corrected shape.
For this reason, the present embodiment can measure the shape of the strip steel S corrected in the shape correcting step S30 through the second measuring step S40.
Fig. 6 is a flowchart showing a shape correcting step of a strip shape correcting method according to another embodiment of the present invention.
Referring to fig. 6, in the shape correcting step S50, the pressing force and tension to the strip S can be controlled so that the shape of the strip S measured in the second measuring step S40 corresponds to the target shape, and thus the target pressing force of the shape correcting step S30 can be corrected.
The shape correcting step S50 may include a shape comparing step S51 of comparing the shape of the strip S being corrected, measured in the second measuring step S40, with a target shape, and determining whether correction of the target pressing force is necessary or not based on the result.
The shape correcting step S50 may include a tension correcting step S52, in which, when it is determined in the shape comparing step S51 that correction is necessary, the tension generated in the strip S is corrected so that the target pressing force of the target pressing force setting step S20 is corrected to cancel out the difference in the compared shapes.
In the tension correction step S52, the controller 162 of the shape correction unit 160 corrects the elongation in each width section determined in the shape comparison step S51, taking into account the tension of the strip S.
At this time, the tension generated in the strip S can be estimated from the torque of the mandrel 118, thereby making it possible to predict the elastic deformation of the strip S in the longitudinal direction. The longitudinal elastic deformation of the strip S may be simply calculated in proportion to the elastic coefficient and the tension of the strip S, or the tensile-strength curve (tensile-strength curve) of the strip S may be used to predict the elastic deformation other than the plastic deformation, and the tension may be corrected by using the flatness calculation formulas of formulas 3 and 4 in consideration of the elastic deformation of the material.
[ mathematical formula 3]
[ mathematical formula 4]
Wherein L is in the corresponding width interval, including L0Length of space (d) is the material length of the space. That is, L is the actual length of the strip S after deformation, L0The original length of the strip S is the length before the deformation. For example, in a perfect plane, L ═ L0When flatness (wave) is generated, L>L0。
Also, the shape correcting step S50 may include a target pressing force correcting step S53 of correcting the elongation for each width section using the tension corrected in the tension correcting step S52 to correct the target pressing force of the shape correcting step S30 and correct a value for offsetting the corrected elongation to the target pressing force.
The target pressing force corrected in the target pressing force correcting step S53 can be obtained by the following equation 5.
[ math figure 5]
Wherein, FnThe pressing force of the nth width interval is shown, △ FnA value for correcting the pressing force, f, indicating the nth width intervalR(F) Is a function of the elongation to the depression force (F) calculated by the soft-reduction model, YavgDenotes the average elongation, Y, of the entire width intervalnThe elongation of the nth width interval is shown.
As described above, in the method for correcting the shape of the strip S in the hot rolling process according to the present embodiment, the target pressing force applied to the strip S is set to correct the strip S using the tension-free shape of the strip S in which the measured shape value of the strip S is corrected by the tension of the strip S, and the process of measuring the corrected shape of the strip S and comparing the measured shape with the target shape to correct the target pressing force is continuously and repeatedly performed in real time, so that the difference in elongation between the width sections is minimized, and the flatness of the strip S can be optimized.
It will be apparent to those skilled in the art to which the present invention pertains that the present invention is not limited to the above-described embodiments and drawings, and that various substitutions, modifications, and changes can be made without departing from the scope of the technical spirit of the present invention as set forth in the claims.
Claims (7)
1. A strip shape correction device provided on an entry side of a mandrel for winding a hot-rolled strip, for correcting a shape of the strip, the device comprising:
a first shape measuring unit that measures the shape of the strip steel supplied to the entry side of the mandrel;
a shape correction unit that corrects the shape of the strip by pressing a pinch roller configured to press the strip with a set target pressing force such that the shape of the strip measured by the first shape measurement unit is corrected to a target shape according to an elongation based on the pressing force and the tension of the strip;
a second shape measuring unit that measures the shape of the strip steel corrected by the shape correcting unit; and
a shape correcting section that controls the pressing force and tension of the strip steel by the shape correcting section to correct a target pressing force so that the shape of the strip steel measured by the second shape measuring section corresponds to a target shape,
wherein the shape correcting portion includes:
a pressure measuring sensor for measuring a pressing force for pressing the strip steel;
a tension measuring sensor for measuring the tension of the strip steel which is pressed by the press roller and moves; and
a control unit for setting a target pressing force by using the pressure measuring sensor and the tension measuring sensor and controlling the press roller to pressurize the strip steel by the target pressing force,
wherein the shape correcting portion corrects the tension generated in the strip steel, thereby correcting the set target pressing force.
2. The strip shape correcting apparatus according to claim 1,
the tension measuring sensor includes a torque sensor.
3. The strip shape correcting apparatus according to claim 1,
the press roller includes:
at least one vertical press roller which is arranged in a pair in an upper part and a lower part of the strip steel in a manner of facing each other, and is used for pressing the transferred strip steel; and
at least one width direction press roller which is arranged in a pair in an opposing manner in the width direction of the steel strip.
4. The strip shape correcting apparatus according to any one of the preceding claims,
in the shape correcting portion, a load of the press roller pressing the strip in the up and down direction is 300 to 1000 tons, a load of the press roller pressing the strip in the width direction correcting the shape in the width direction of the strip is 50 to 200 tons, and an elongation of the strip is 0 to 4%.
5. A strip shape correcting method of a hot rolling process for correcting a shape of a strip in a process of rolling the hot rolled strip, the method comprising:
a first measuring step of measuring the shape of the strip steel at the inlet side of a mandrel for winding the strip steel;
a target pressing force setting step of setting a target pressing force for correcting the shape of the strip steel measured in the first measuring step into a target shape of the strip steel according to an elongation based on the pressing force and the tension of the strip steel;
a shape correcting step of applying the target pressing force set in the target pressing force setting step to the strip steel, thereby correcting the shape of the strip steel;
a second measuring step of measuring a shape of the strip steel corrected in the shape correcting step; and
a shape correcting step of controlling a pressing force and a tension to the strip steel to correct a target pressing force of the shape correcting step so that the shape of the strip steel measured in the second measuring step corresponds to a target shape,
the shape correcting step includes:
a shape comparison step of comparing the shape of the corrected strip steel measured in the second measurement step with a target shape and judging whether correction of a target pressing force is required;
a tension correcting step of correcting the tension generated in the strip steel so that the target pressing force of the target pressing force setting step is corrected, in order to cancel out the compared shape difference, when it is determined that the target pressing force needs to be corrected in the shape comparing step; and
and a target pressing force correcting step of correcting the elongation in each width section by using the tension corrected in the tension correcting step so that the target pressing force in the shape correcting step is corrected, and correcting a value for offsetting the corrected elongation by using the target pressing force.
6. The method for correcting a strip shape according to claim 5, which is a method for correcting a strip shape in a hot rolling process,
the target pressing force setting step includes:
an elongation calculation step of deriving a maximum elongation for shape correction from a difference between a maximum value and a minimum value among the flatness measurement values of the respective width sections measured in the first measurement step;
a maximum extension difference tension correcting step of measuring a tension generated on the strip steel, dividing the measured tension by a material elastic coefficient of the strip steel to correct the tension, and adding the maximum extension difference tension to the corrected maximum extension difference tension;
a target elongation setting step of setting a target elongation corresponding to a maximum elongation difference so as to be able to cancel the maximum elongation difference corrected in the maximum elongation difference tension correcting step; and
a target pressing force calculating step of setting a target pressing force set value using a light pressing model so as to obtain the target elongation set in the target elongation setting step.
7. The strip steel shape correcting method according to claim 5,
the target pressing force corrected in the shape correcting step satisfies the following mathematical expression,
the mathematical formula is as follows:
wherein, FnThe pressing force of the nth width interval is shown, △ FnA value for correcting the pressing force, f, indicating the nth width intervalR(F) Is a function of the elongation to the depressing force F calculated by the soft-depression model, YavgDenotes the average elongation, Y, over the entire width intervalnThe elongation of the nth width interval is shown.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2015-0183893 | 2015-12-22 | ||
| KR1020150183893A KR101726088B1 (en) | 2015-12-22 | 2015-12-22 | Strip shape controller and method of the same |
| PCT/KR2016/004776 WO2017111216A1 (en) | 2015-12-22 | 2016-05-06 | Strip shape correction device and method |
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| Publication Number | Publication Date |
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| CN108602098A CN108602098A (en) | 2018-09-28 |
| CN108602098B true CN108602098B (en) | 2020-06-12 |
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| JP (1) | JP2019505385A (en) |
| KR (1) | KR101726088B1 (en) |
| CN (1) | CN108602098B (en) |
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| WO (1) | WO2017111216A1 (en) |
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Also Published As
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| JP2019505385A (en) | 2019-02-28 |
| WO2017111216A1 (en) | 2017-06-29 |
| CN108602098A (en) | 2018-09-28 |
| KR101726088B1 (en) | 2017-04-12 |
| DE112016005878B4 (en) | 2023-11-09 |
| DE112016005878T5 (en) | 2018-09-20 |
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