AU2016374757A1 - Metal band stabilizing device and hot-dip metal band manufacturing method - Google Patents

Metal band stabilizing device and hot-dip metal band manufacturing method Download PDF

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Publication number
AU2016374757A1
AU2016374757A1 AU2016374757A AU2016374757A AU2016374757A1 AU 2016374757 A1 AU2016374757 A1 AU 2016374757A1 AU 2016374757 A AU2016374757 A AU 2016374757A AU 2016374757 A AU2016374757 A AU 2016374757A AU 2016374757 A1 AU2016374757 A1 AU 2016374757A1
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Prior art keywords
metal strip
electromagnet
vibration
electromagnets
displacement sensor
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AU2016374757A
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AU2016374757B2 (en
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Yusuke ISHIGAKI
Yoshiaki Nishina
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JFE Steel Corp
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JFE Steel Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
    • B65H23/18—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web
    • B65H23/188—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web in connection with running-web
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
    • C23C2/24—Removing excess of molten coatings; Controlling or regulating the coating thickness using magnetic or electric fields
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
    • C23C2/40—Plates; Strips
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
    • F16F15/03—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using magnetic or electromagnetic means

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Acoustics & Sound (AREA)
  • Electromagnetism (AREA)
  • Coating With Molten Metal (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
  • Vibration Prevention Devices (AREA)

Abstract

Provided are: a metal band stabilizing device capable of effectively performing metal band vibration control and position correction even when the metal band stabilizing device cannot be provided near the site where metal band vibration and position should be controlled; and a method for manufacturing hot-dip metal bands using said stabilizing device. The metal band stabilizing device is characterized in that: the metal band stabilizing device is provided with a contactless displacement sensor, a control unit, a first electromagnet and a second electromagnet; the number N1 of windings of the first electromagnet is less than the number N2 of windings of the second electromagnet; and from the site where vibrations of the metal band are controlled and position is corrected with the first electromagnet and the second electromagnet, the electromagnets and the contactless displacement sensor are disposed in a row with the first electromagnet, the contactless displacement sensor, and the second electromagnet in said order in the metal band conveyance direction.

Description

DESCRIPTION
Title of Invention: METAL STRIP STABILIZER AND METHOD FOR MANUFACTURING HOT-DIP COATED METAL STRIP Technical Field [0001]
The present invention relates to a metal strip stabilizer and a method for manufacturing a hot-dip coated metal strip using the same.
Background Art [0002]
In a line for manufacturing a metal strip, stably maintaining a pass line of the metal strip with suppressed vibration or warp of the metal strip contributes not only to improvement in the quality of the metal strip but also to improvement in the efficiency of the manufacturing line of the metal strip.
[0003]
For example, in a line for manufacturing a hot-dip coated metal strip, there is a step of coating surfaces of the metal strip with molten metal by causing the metal strip to travel while immersing the metal strip in a molten metal bath. In this step, in order to suppress the occurrence of non-uniformity in the coating weight of molten metal, adjustment is performed to blow off excess molten metal coating on the metal strip by the flow of wiping gas ejected from gas wipers disposed on the downstream side of the molten metal bath.
[0004]
In this adjustment, it is necessary to eject a wiping gas from the gas wipers so that uniform pressure can be applied to the front and back sides of the metal strip in the width direction of the metal strip. Thus, when distances between the gas wipers and the metal strip are not constant, such as when the metal strip vibrates, when the metal strip is warped, or when a pass line of the metal strip is biased to either the front or back side of the metal strip, the pressure of the wiping gas is not uniform in the width direction and in the direction of travel of the metal strip. As a result, there arises a problem in that non-uniformity occurs in the coating weight of molten metal on the front and back sides of the metal strip or in the width direction and the direction of travel of the metal strip .
[0005]
As a method for addressing the problem described above, technology is known for suppressing warp or vibration of a metal strip in a non-contact manner by using electromagnets to stabilize a pass line of the metal strip. For example, there is a known method in which a pair of electromagnets are arranged so as to face each other with a pass line therebetween along which the metal strip is to move, and the respective attractive forces of the electromagnets are made to act on the metal strip in a switching manner in accordance with a signal from a separately disposed position detector (see Patent Literature 1).
[0006]
Suppression of vibration of a metal strip by using electromagnets in the way described above requires high response of the electromagnets. Further, warp correction and pass line correction require high attractive forces of the electromagnets (a combination of warp correction and pass line correction is hereinafter sometimes referred to as position correction). That is, both high response and large attractive force are required to concurrently achieve both vibration suppression and position correction of the metal strip. However, an increase in the number of turns in a coil of an electromagnet to increase the attractive force of the electromagnet may result in a decrease in the response of the electromagnet, whereas a decrease in the number of turns to improve the response of the electromagnet may result in a reduction in the attractive force of the electromagnet.
[0007]
Accordingly, to achieve both high response and large attractive force, there has been proposed technology for non-contact control of a metal strip using two types of independent electromagnets, one of which is used for vibration suppression and the other of which is used for position correction (see Patent Literature 2). This technology enables vibration control using a vibration-suppression electromagnet having a small number of turns and warp correction and pass line correction (position correction) using a position-correction electromagnet having a large number of turns, and is hence considered to enable both high response and large attractive force to be achieved. Citation List Patent Literature [0008] PTL 1: Japanese Unexamined Patent Application Publication No. 2-62355 PTL 2: Japanese Unexamined Patent Application Publication No. 2015-160959 Summary of Invention Technical Problem [0009]
In the technology described in Patent Literature 2, if a metal strip stabilizer is difficult to place near a location where vibration and position control of a metal strip is desired, the effect of vibration suppression and position correction of the metal strip is not fully realized.
[0010]
Accordingly, technology is necessary that enables effective vibration suppression and position correction of a metal strip even when a metal strip stabilizer is difficult to place near a location where vibration and position control of the metal strip is desired.
[0011]
The present invention has been made to overcome the foregoing problems, and it is an object of the present invention to provide a metal strip stabilizer that provides effective vibration suppression and position correction of a metal strip even when the metal strip stabilizer is difficult to place near a location where vibration and position control of the metal strip is desired and to provide a method for manufacturing a hot-dip coated metal strip using the stabilizer.
Solution to Problem [0012]
The inventors have intensive studies to overcome the foregoing problems. As a result of the intensive studies, the inventors have found that the effect of vibration suppression and position correction of a metal strip largely changes depending on the arrangement positions of a first electromagnet, a non-contact displacement sensor, and a second electromagnet.
[0013]
The present invention has been made based on the findings described above. Specifically, the present invention provides the following aspects.
[0014] [1] A metal strip stabilizer including a non-contact displacement sensor that measures a displacement of a metal strip that is running online, a control unit that receives a signal from the non-contact displacement sensor and outputs a vibration suppression signal for suppressing vibration of the metal strip and a position correction signal for correcting a position of the metal strip, a first electromagnet that generates a magnetic force in accordance with the vibration suppression signal output from the control unit, and a second electromagnet that generates a magnetic force in accordance with the position correction signal output from the control unit, wherein the number of turns N1 in the first electromagnet is smaller than the number of turns N2 in the second electromagnet, and the electromagnets and the non-contact displacement sensor are arranged side by side in a metal strip transport direction in an order of the first electromagnet, the non-contact displacement sensor, and the second electromagnet from a location where the vibration of the metal strip is suppressed and the position of the metal strip is corrected by using the first electromagnet and the second electromagnet.
[0015] [2] A method for manufacturing a hot-dip coated metal strip, including a coating step of coating a metal strip that is traveling along a manufacturing line with molten metal, and an adjustment step of adjusting a coating weight of molten metal by using a gas wiper that blows off excess molten metal coating on the metal strip, wherein the metal strip stabilizer according to [1] controls the vibration and position of the metal strip in a non-contact manner at a position where the metal strip passes through the gas wiper. Advantageous Effects of Invention [0016]
According to the present invention, effective vibration suppression and position correction of a metal strip can be achieved even when a metal strip stabilizer is difficult to place near a location where vibration and position control of the metal strip is desired.
Brief Description of Drawings [0017] [Fig. 1] Fig. 1 is a schematic diagram schematically illustrating a configuration of a metal strip stabilizer 1 according to an embodiment of the present invention.
[Fig. 2] Fig. 2 is a block diagram illustrating a configuration of a control unit 6 in the metal strip stabilizer 1 according to the embodiment of the present invention .
[Fig. 3] Fig. 3 is a schematic diagram schematically illustrating a portion of a typical line for manufacturing a hot-dip coated metal strip.
[Fig. 4] Fig. 4 is a schematic diagram schematically illustrating the arrangement of electromagnets and a non-contact displacement sensor in comparative examples and an example of the present invention.
[Fig. 5] Fig. 5 is a diagram illustrating results of comparison of vibration suppression performance and position correction performance between the example of the present invention and the comparative examples.
Description of Embodiments [0018]
An embodiment of the present invention will be described hereinafter. It should be noted that the present invention is not limited to the following embodiment.
[0019] <Metal Strip Stabilizer> A metal strip stabilizer according to an embodiment of the present invention will be described hereinafter with reference to the drawings. Fig. 1 is a schematic diagram schematically illustrating a configuration of a metal strip stabilizer 1 according to an embodiment of the present invention. As illustrated in Fig. 1, the metal strip stabilizer 1 according to the embodiment of the present invention includes a pair of vibration-suppression electromagnets 3a and 3b, which are placed so as to face each other with a metal strip 2 therebetween that runs in a direction indicated by an arrow A in the figure, a pair of position-correction electromagnets 4a and 4b, a non-contact displacement sensor 5, and a control unit 6 that controls the electromagnets 3a, 3b, 4a, and 4b on the basis of an input from the non-contact displacement sensor 5.
[0020]
Letting B a location where vibration and position control of the metal strip is desired (a location where vibration of the metal strip is suppressed and the position of the metal strip is corrected by using the electromagnets 3a, 3b, 4a, and 4b), the vibration-suppression electromagnets 3a and 3b, the non-contact displacement sensor 5, and the position-correction electromagnets 4a and 4b are arranged in this order in a direction away from B in the longitudinal direction of the metal strip (metal strip transport direction).
[0021]
The vibration-suppression electromagnets 3a and 3b each include a core and a coil wrapped around the core. The number of turns N1 in the coils of the vibration-suppression electromagnets 3a and 3b is smaller than the number of turns N2 in the coils of the position-correction electromagnets 4a and 4b. A description is given here, taking as an example a case where the coils of the vibration-suppression electromagnets 3a and 3b have the same number of turns. However, the coils of the vibration-suppression electromagnet 3a and the vibration-suppression electromagnet 3b may have different numbers of turns. It should be noted that the vibration-suppression electromagnets 3a and 3b correspond to a first electromagnet.
[0022]
The vibration-suppression electromagnets 3a and 3b are controlled by the control unit 6 described below. Thus, the vibration-suppression electromagnets 3a and 3b are connected to the control unit 6.
[0023]
The vibration-suppression electromagnets 3a and 3b perform dynamic control and thus are desirably positioned as close to the location where control is desired (B) as possible. The response of the vibration-suppression electromagnets 3a and 3b is required to be high enough to follow the vibration frequency of the metal strip 2 (usually the natural frequency of bending, twisting, or the like of the metal strip). Since no large attractive force is necessary to reduce vibration having the natural frequency of the metal strip, the vibration-suppression electromagnets 3a and 3b are not required to have large attractive forces.
[0024]
As described above, the coils of the vibration-suppression electromagnets 3a and 3b may have a small number of turns N1 and preferably have a number of turns in the range of 100 to 600 turns. In addition, in terms of high response, the vibration-suppression electromagnets 3a and 3b are preferably placed in the vicinity of the location where control is desired (B) and are preferably placed in a range of 100 to 600 mm away from the location where control is desired (B).
[0025]
The position-correction electromagnets 4a and 4b each include a core and a coil wrapped around the core, and the number of turns N2 in the coils of the position-correction electromagnets 4a and 4b is larger than the number of turns N1 in the coils of the vibration-suppression electromagnets 3a and 3b. A description is given here, taking as an example a case where the coils of the position-correction electromagnets 4a and 4b have the same number of turns. However, the coils of the position-correction electromagnet 4a and the position-correction electromagnet 4b may have different numbers of turns. It should be noted that the position-correction electromagnets 4a and 4b correspond to a second electromagnet.
[0026]
The position-correction electromagnets 4a and 4b are controlled by the control unit 6 described below. Thus, the position-correction electromagnets 4a and 4b are connected to the control unit 6.
[0027]
The position-correction electromagnets 4a and 4b perform static control and thus can appropriately perform position correction at the location where control is desired (B) if they exert large attractive forces even when they are placed at a position away from the location where control is desired (B). The position-correction electromagnets 4a and 4b are required to be capable of generating large attractive forces with small current. It is thus preferable that the number of turns N2 in the position-correction electromagnets 4a and 4b be large so long as the sizes of the electromagnets and the value of electrical resistance are not excessively large.
[0028]
As described above, the number of turns N2 in the coils of the position-correction electromagnets 4a and 4b is preferably greater than or equal to a certain value, and the number of turns preferably falls in the range of 600 to 2000 turns. In addition, in terms of large attractive force, the position-correction electromagnets 4a and 4b may be positioned slightly away from the location where control is desired (B) and may be placed in a range of 400 to 1000 mm away from the location where control is desired (B).
[0029]
The non-contact displacement sensor 5 measures displacement of the metal strip 2 that is running online.
The displacement measured here is used in the control unit 6. Thus, the non-contact displacement sensor 5 is connected to the control unit 6. The non-contact displacement sensor 5 is arranged between the vibration-suppression electromagnets 3a and 3b and the position-correction electromagnets 4a and 4b so as to enable quick transmission of signals.
[0030]
The control unit 6 will be described with reference to Fig. 2. Fig. 2 is a block diagram illustrating a configuration of the control unit 6 in the metal strip stabilizer 1 according to the embodiment of the present invention. As illustrated in Fig. 2, the control unit 6 includes an operation amount computation device 7, front/back distribution devices 8a and 8b, and amplifiers 9a, 9b, 9c, and 9d.
[0031]
The operation amount computation device 7 is connected to the non-contact displacement sensor 5, and the measured value of the displacement of the metal strip is sent from the non-contact displacement sensor 5 to the operation amount computation device 7. The operation amount computation device 7 is also connected to an input means 10 that stores a preset target value of displacement, and the input means 10 sends the target value to the operation amount computation device 7. The operation amount computation device 7 performs so-called PID control, such as proportional-integral-derivative control, on an error signal between the measured value and the target value and outputs a vibration suppression signal and a position correction signal.
[0032]
Each of the front/back distribution devices 8a and 8b is connected to the operation amount computation device 7. The front/back distribution devices 8a and 8b distribute the vibration suppression signal and the position correction signal, which are obtained as a result of computation performed by the operation amount computation device 7, for use in control of the vibration-suppression electromagnet 3a and the position-correction electromagnet 4a for the front surface of the metal strip 2 and for use in control of the vibration-suppression electromagnet 3b and the position-correction electromagnet 4b for the back surface of the metal strip 2.
[0033]
The amplifier 9a supplies power to the vibration-suppression electromagnet 3a in accordance with the vibration suppression signal for the front surface, which is distributed by the front/back distribution device 8a.
[0034]
The amplifier 9b supplies power to the vibration-suppression electromagnet 3b in accordance with the vibration suppression signal for the back surface, which is distributed by the front/back distribution device 8a.
[0035]
The amplifier 9c supplies power to the position-correction electromagnet 4a in accordance with the position correction signal for the front surface, which is distributed by the front/back distribution device 8b.
[0036]
The amplifier 9d supplies power to the position-correction electromagnet 4b in accordance with the position correction signal for the back surface, which is distributed by the front/back distribution device 8b.
[0037]
As described above, the stabilizer of the present invention has a configuration in which the number of turns N1 in the vibration-suppression electromagnets 3a and 3b is smaller than the number of turns N2 in the position-correction electromagnets 4a and 4b and also has a configuration in which the electromagnets 3a, 3b, 4a, and 4b and the non-contact displacement sensor 5 are arranged side by side in the longitudinal direction of the metal strip 2 in the order of the vibration-suppression electromagnets 3a and 3b, the non-contact displacement sensor 5, and the position-correction electromagnets 4a and 4b from the location where correction is to be performed (B). With this arrangement, the effect of vibration suppression and position correction can be greatly increased even when a metal strip stabilizer is difficult to place in the vicinity of a location where vibration and position control of a metal strip is desired. It is considered that this increase in the effect can be explained as follows.
[0038]
In order to increase vibration suppression performance, the vibration-suppression electromagnets 3a and 3b, in which the number of turns N1 is set smaller than the number of turns N2 in the position-correction electromagnets 4a and 4b, are arranged at positions that are closest to the location where control is desired (B) among the electromagnets and the non-contact displacement sensor. This can maintain the effect of vibration suppression high even when a stabilizer of the metal strip 2 is difficult to place in the vicinity of the location where vibration and position control of the metal strip 2 is desired (B). Furthermore, by increasing the number of turns N2 in the position-correction electromagnets 4a and 4b, the effect of position correction can be maintained high even in the above-described case. In addition, the non-contact displacement sensor 5 is arranged between the vibration-suppression electromagnets 3a and 3b and the position-correction electromagnets 4a and 4b, which prevents excessive delay of signals to be sent to the electromagnets. Thus, a reduction in the effect due to the position at which the non-contact displacement sensor 5 is placed can be suppressed.
[0039] <Method for Manufacturing Hot-Dip Coated Metal Strip>
Next, a safety apparatus of the present invention will be described, taking as an example a case where a hot-dip coated metal strip is manufactured. A method for manufacturing a hot-dip coated metal strip described below corresponds to a method for manufacturing a hot-dip coated metal strip of the present invention.
[0040]
Fig. 3 is a schematic diagram schematically illustrating a portion of a typical line for manufacturing a hot-dip coated metal strip. In the line for manufacturing a hot-dip coated metal strip illustrated in Fig. 3, the metal strip 2 is transported from an upstream process such as a cold rolling process. The metal strip 2 is subjected to an annealing treatment in an annealing furnace 11, which is maintained under a non-oxidizing or reducing atmosphere. After that, the metal strip 2 is cooled to substantially the same temperature as the temperature of molten metal and is then introduced into a molten metal bath 12.
[0041]
In the molten metal bath 12, the metal strip 2 travels while immersed in molten metal and surfaces of the metal strip 2 are coated with molten metal (corresponding to a coating step). After that, the metal strip 2, which is taken out from the molten metal bath 12, is subjected to gas flow ejected from gas wipers 13 to blow off excess molten metal to adjust the coating weight of molten metal (corresponding to an adjustment step).
[0042]
In the manufacturing method of the present invention, the position where the metal strip 2 passes through the gas wipers 13 corresponds to the location where vibration and position control of the metal strip 2 is desired (B). When the line for manufacturing a hot-dip coated metal strip is provided with a cooling device or covers of the gas wipers 13, which are not illustrated in Fig. 3, a stabilizer of the metal strip 2 may consequently be difficult to place in the vicinity of a gas wiper passage position that is a position where the metal strip 2 passes through the gas wipers 13.
In this case, the stabilizer 1 is arranged at a position slightly away from the gas wiper passage position. With the use of the stabilizer 1 of the present invention, vibration suppression and position correction of a metal strip at the gas wiper passage position can be effectively achieved even in the case of the arrangement described above. This can make the distances between the gas wipers 13 and the metal strip 2 constant and can make the pressure of the wiping gas constant, which enables suppression of non-uniformity in the coating weight of molten metal on the metal strip 2.
[0043]
In a process subsequent to the above-described steps, in some cases, in accordance with application, for example, when the metal strip 2 is used as an automobile outer panel, the metal strip 2 may be subjected to an alloying treatment for reheating the metal strip using an alloying furnace 14 to produce a homogeneous alloy layer. After passing through a cooling zone 15, the metal strip 2 is subjected to a special rustproofing, anti-corrosion treatment by using a chemical conversion unit 16 and is then coiled in a coil before it is shipped.
EXAMPLE
[0044]
To confirm advantageous effects of the present invention, in a line for manufacturing a hot-dip coated metal strip, a verification experiment was performed by using a metal strip stabilizer according to an embodiment of the present invention.
[0045]
Fig. 4 is a schematic diagram schematically illustrating the arrangement of electromagnets and a non-contact displacement sensor in comparative examples and an example .
[0046]
In Comparative Example 1, as illustrated in Fig. 4, the non-contact displacement sensor 5, the vibration suppression electromagnets 3a and 3b, and the position correction electromagnets 4a and 4b were arranged side by side in the longitudinal direction of the metal strip 2 in this order from the gas wipers 13, and the vibration and position of the metal strip 2 were controlled at the position where the metal strip 2 passed through the gas wipers 13. Here, the number of turns N1 in the coils of the vibration suppression electromagnets 3a and 3b is smaller than the number of turns N2 in the coils of the position correction electromagnets 4a and 4b.
[0047]
Comparative Example 2 assumes a case where additional facilities such as the covers of the gas wipers and a cooling device are present in the vicinity of the gas wipers 13. As illustrated in Fig. 4, the electromagnets and the non-contact displacement sensor are arranged farther away from the gas wipers than in Comparative Example 1, and the vibration and position of the metal strip were controlled. Here, the order in which the electromagnets and the non-contact displacement sensor are arranged and the numbers of turns in the electromagnets are the same as those in Comparative Example 1.
[0048]
In Comparative Example 3, unlike Comparative Example 2, the number of turns in the position correction electromagnets 4a and 4b was changed to N2', which is larger than N2, and the vibration and position of the metal strip were controlled. Here, the distances of the electromagnets and the non-contact displacement sensor from the gas wipers and the order in which the electromagnets and the non-contact displacement sensor are arranged are the same as those in Comparative Example 2.
[0049]
Then, as Example 1 of the present invention, electromagnets and a non-contact displacement sensor were arranged side by side in the longitudinal direction of the metal strip 2 in the order of the vibration suppression electromagnets 3a and 3b, the non-contact displacement sensor 5, and the position correction electromagnets 4a and 4b from the gas wipers 13, and the vibration and position of the metal strip were controlled. It should be noted that the placement of the electromagnets and the non-contact displacement sensor in the vicinity of the gas wipers is not allowed, as in Comparative Examples 2 and 3. Further, the numbers of turns in the electromagnets are the same as those in Comparative Example 3.
[0050]
Results of comparison of vibration suppression performance and position correction performance in a gas wiper section among the examples are illustrated in Fig. 5. Here, the performances in Comparative Example 1 are normalized to 1. In Comparative Example 2, both vibration suppression performance and position correction performance are lower than those in Comparative Example 1 since the vibration suppression electromagnets and the position correction electromagnets are positioned farther away from the gas wipers but the numbers of turns in the electromagnets are the same as those in Comparative Example 1. In Comparative Example 3, the number of turns in the position correction electromagnets is larger than that in Comparative Example 2 to provide larger attractive forces, and forces necessary for position correction can be exerted.
As a result, position correction performance equivalent to that in Comparative Example 1 can be achieved. For a vibration suppression electromagnet, however, response required for vibration suppression needs to be ensured. Thus, it is not possible to readily increase the number of turns in the vibration suppression electromagnet. A vibration suppression electromagnet farther away from a gas wiper is more disadvantages for vibration suppression when the numbers of turns are the same. In Example 1 of the present invention, in contrast, the arrangement of the electromagnets and the non-contact displacement sensor is changed in such a manner that the vibration suppression electromagnets are arranged closer to the gas wipers, which ensures vibration suppression performance although the arrangement is changed within a small range. Thus, vibration suppression performance equivalent to that in Comparative Example 1 can be achieved. For position correction performance, as in Comparative Example 3, an increase in the number of turns in the corresponding electromagnets can compensate for the influence of the arrangement of the electromagnets away from the gas wipers. As a result, position correction performance equivalent to that in Comparative Example 1 can be achieved.
[0051]
Accordingly, it has been found that the side-by-side arrangement of the vibration suppression electromagnets 3a and 3b, the non-contact displacement sensor 5, the position correction electromagnets 4a and 4b in the longitudinal direction of the metal strip 2 in this order from a location where vibration and position control is desired enables control to be performed with maximized vibration suppression performance and position correction performance even when interference of facilities or the like causes electromagnets to be positioned away from a gas wiper section where vibration and position control is desired.
[0052]
Furthermore, because of the effect described above that control can be performed with maximized vibration suppression performance and position correction performance, in a method for manufacturing a hot-dip coated metal strip according to an embodiment of the present invention, the pressure of the wiping gas can be uniform, which can reduce non-uniformity in the coating weight of molten metal on the metal strip 2.
[0053]
Additionally, in a hot-dip coated metal strip obtained through the manufacturing method of the present invention, non-uniformity in the coating weight of molten metal can be reduced.
Industrial Applicability [0054]
The present invention is useful for a line for manufacturing a metal strip and is suitable in particular for a line for manufacturing a hot-dip coated metal strip. Reference Signs List [0055] 1 metal strip stabilizer 2 metal strip 3a, 3b vibration-suppression electromagnet 4a, 4b position-correction electromagnet 5 non-contact displacement sensor 6 control unit 7 operation amount computation device 8a, 8b front/back distribution device 9a to 9d amplifier 10 input means 11 annealing furnace 12 molten metal bath 13 gas wiper 14 alloying furnace 15 cooling zone 16 chemical conversion unit A direction of travel of metal strip B location where vibration and position control is desired

Claims (2)

  1. CLAIMS [Claim 1] A metal strip stabilizer comprising: a non-contact displacement sensor that measures a displacement of a metal strip that is running online; a control unit that receives a signal from the non-contact displacement sensor and outputs a vibration suppression signal for suppressing vibration of the metal strip and a position correction signal for correcting a position of the metal strip; a first electromagnet that generates a magnetic force in accordance with the vibration suppression signal output from the control unit; and a second electromagnet that generates a magnetic force in accordance with the position correction signal output from the control unit, wherein the number of turns N1 in the first electromagnet is smaller than the number of turns N2 in the second electromagnet, and the electromagnets and the non-contact displacement sensor are arranged side by side in a metal strip transport direction in an order of the first electromagnet, the non-contact displacement sensor, and the second electromagnet from a location where the vibration of the metal strip is suppressed and the position of the metal strip is corrected by using the first electromagnet and the second electromagnet. [Claim
  2. 2] A method for manufacturing a hot-dip coated metal strip, comprising a coating step of coating a metal strip that is traveling along a manufacturing line with molten metal, and an adjustment step of adjusting a coating weight of molten metal by using a gas wiper that blows off excess molten metal coating on the metal strip, wherein the metal strip stabilizer according to Claim 1 controls the vibration and position of the metal strip in a non-contact manner at a position where the metal strip passes through the gas wiper.
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PCT/JP2016/087515 WO2017110667A1 (en) 2015-12-25 2016-12-16 Metal band stabilizing device and hot-dip metal band manufacturing method

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JP2522743Y2 (en) * 1991-01-24 1997-01-16 神鋼電機株式会社 Steel plate vibration suppression position control device
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JPH10298727A (en) * 1997-04-23 1998-11-10 Nkk Corp Vibration and shape controller for steel sheet
JP2001015336A (en) * 1999-06-28 2001-01-19 Nkk Corp Electromagnet for noncontact control
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JP2017115213A (en) 2017-06-29
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MY186665A (en) 2021-08-05
TWI617701B (en) 2018-03-11

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