WO2019106785A1

WO2019106785A1 - Plate warp correction device for metal plates, and continuous plating processing equipment for metal plates

Info

Publication number: WO2019106785A1
Application number: PCT/JP2017/043023
Authority: WO
Inventors: 隆米倉; 正雄丹原; 吉川　雅司
Original assignee: ＰｒｉｍｅｔａｌｓＴｅｃｈｎｏｌｏｇｉｅｓＪａｐａｎ株式会社
Priority date: 2017-11-30
Filing date: 2017-11-30
Publication date: 2019-06-06
Also published as: US20200261957A1; CN111295461A; JP6381858B1; JPWO2019106785A1; EP3686311A1; EP3686311A4; EP3686311B1

Abstract

A plate warp correction device for metal plates, the device being used in continuous plating processing equipment for metal plates and being characterized by comprising a sink roll that is disposed in a molten metal pot for plating, further on the downstream side in the conveyance direction of the metal plates than a fixing roll that changes the conveyance direction of the metal plates, and a correction roll that is disposed between the fixing roll and the sink roll and is for correcting warp in the metal plates, wherein the ratio D3/D1 of the diameter D3 of the sink roll to the diameter D1 of the fixing roll is at least 1.5.

Description

Device for correcting warpage of metal plate and continuous plating treatment equipment for metal plate

The present disclosure relates to a plate warp correction device for a metal plate and a continuous plating treatment facility for a metal plate.

When a strip-shaped metal plate is continuously subjected to hot-dip plating, the sheet width direction of the metal plate on the outlet side of the molten metal (plating bath), for example, in order to make the adhesion amount of the molten metal in the metal plate uniform. It is sometimes required to flatten the metal plate by reducing the warpage of the metal plate.

As a mechanism for reducing the warp in the plate width direction of the metal plate on the molten metal pot outlet side, for example, in

Patent Documents

1 and 2, a plating bath on the upstream side of a plating bath for hot-dip plating of steel strip There is disclosed a continuous hot-dip plating apparatus provided with a roll which imparts a warp in the opposite direction to the widthwise warping of a steel strip after passing through the sink roll.
Further, in Patent Document 2, the axis of the above-mentioned roll (snub roll) provided on the upstream side of the plating bath is moved in parallel to adjust the pressing amount of the roll relative to the pass line direction of the steel sheet. It is disclosed to adjust this pressing amount according to the width and the like.

JP-A-2-54746 JP-A-3-166354

By the way, as a result of intensive studies by the present inventors, as described in

Patent Documents

1 and 2, on the upstream side of the molten metal pot (plating bath), the warp in the direction opposite to the warp in the width direction of the metal plate after passing through the sink roll. When a correction roll which gives warp is provided, especially when the thickness of the metal plate is relatively large (for example, about 1.5 mm or more in the case of a steel plate), the apparent diameter (pushing amount) of the correction roll is minimum and maximum It has been found that there is a case where the warpage of the metal plate generated on the upstream side of the correction roll can not be effectively corrected even if it is changed between the two.

In view of the above-mentioned circumstances, at least one embodiment of the present invention is a metal plate warp correction device capable of effectively correcting the warp in the plate width direction of the metal plate even when the plate thickness is relatively large, and An object of the present invention is to provide a continuous plating processing facility for metal plates.

An apparatus for correcting warpage of a metal plate according to at least one embodiment of the present invention is
An apparatus for correcting warpage of a metal plate, which is used in a continuous plating treatment facility for a metal plate, comprising:
A sink roll disposed in a molten metal pot for plating on the downstream side of the transport direction of the metal plate with respect to a fixed roll for changing the transport direction of the metal plate;
And a correction roll disposed between the fixed roll and the sink roll for correcting the warp of the metal plate,
The ratio D3 / D1 of the diameter D3 of the sink roll to the diameter D1 of the fixed roll is 1.5 or more.

According to at least one embodiment of the present invention, a warp correction device for metal plate and continuous plating of metal plate capable of effectively correcting the warp in the plate width direction of the metal plate even when the plate thickness is relatively large. Processing equipment is provided.

It is a schematic block diagram of the continuous plating processing facility concerning one embodiment. It is the schematic of the board curvature correction apparatus which concerns on one Embodiment. It is a figure for demonstrating the board | substrate curvature amount of a metal plate. It is a graph which shows an example of correlation with the board curvature amount of the metal plate by the board curvature correction apparatus which concerns on one Embodiment, and the diameter D3 of a sink roll. It is a graph which shows an example of correlation with the board curvature amount of the metal plate by the board curvature correction apparatus which concerns on one Embodiment, and the diameter D3 of a sink roll. It is a graph which shows an example of correlation with the board curvature amount of the metal plate by the board curvature correction apparatus which concerns on an Example, and the apparent diameter D2 of a correction roll. It is a graph which shows an example of correlation with the board curvature amount of the metal plate by the board curvature correction apparatus which concerns on a comparative example, and the apparent diameter D2 of a correction roll. It is a figure for demonstrating an example of the calculation method of apparent diameter D2.

Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described as the embodiments or shown in the drawings are not intended to limit the scope of the present invention to this, but are merely illustrative. Absent.

First, with reference to FIG. 1, the whole structure of the continuous-plating processing installation which concerns on some embodiment is demonstrated.
FIG. 1 is a schematic block diagram of a continuous plating apparatus according to an embodiment. As shown in FIG. 1, the continuous plating processing facility 100 is a facility for continuously plating a strip-like metal plate 2 (for example, a steel plate), and a furnace 3 for heat-treating the metal plate 2, and the furnace A pot 6 (molten metal pot) provided outside the metal shell 3 and forming a plating bath 8 and a wiping nozzle 10 for adjusting the adhesion amount of the plating solution (molten metal) to the metal plate 2 are provided.
Arrows in FIG. 1 indicate the transport direction (moving direction) of the metal plate 2.

The furnace 3 is an apparatus for heat-treating the metal plate 2 passing through the inside of the furnace 3, and may be configured to, for example, continuously anneal the metal plate 2.
Inside the furnace 3, a plurality of rolls 14 are provided. The metal plate 2 is conveyed by applying tension to the metal plate 2 with these rolls 14 or changing the direction of the metal plate 2, whereby the metal plate 2 is continuously treated. Is possible.
A reducing or non-oxidizing gas may be supplied to the inside of the furnace 3.

The exit part 4 of the furnace 3 shown in FIG. 1 is provided with

bridle rolls

16A and 16B for adjusting the tension given to the metal plate 2.
The temperature inside the furnace 3 may differ depending on the position. For example, while the temperature is relatively low at the outlet portion 4 of the furnace 3, for example, a position near the burner on the upstream side (hereinafter, also simply referred to as “upstream side”) in the transport direction of the metal plate 2 than the outlet portion 4 It is relatively high temperature. Thus, when there is a temperature distribution in the furnace, the tension to be applied to the metal plate differs depending on the position in the furnace. Therefore, the

bridle rolls

16A and 16B may be configured to apply appropriate tension to the metal plate 2 in accordance with, for example, the temperature distribution inside the furnace 3.

Between the outlet 4 of the furnace 3 and the pot 6, a snout 5, which is a cylindrical member forming a passage of the metal plate 2, is provided. The end on the pot 6 side of the snout 5 is provided so as to be immersed in the molten metal (plating bath 8) stored in the pot 6, and the outflow of gas from the inside of the furnace 3 to the outside, or the furnace 3 Inflow of gas (for example, air) from the outside to the inside of the housing is prevented.

A molten metal as a plating solution is stored in the pot 6 to form a plating bath 8.
Although the kind of molten metal stored in the pot 6 is not specifically limited, For example, when the metal plate 2 is a steel plate, it may be zinc or aluminum, or an alloy containing these.

In the pot 6, a sink roll 20 is provided. The metal plate 2 introduced into the plating bath 8 through the snout 5 from the inside of the furnace 3 is turned upward by the sink roll 20, and the metal plate 2 with the molten metal adhered to the surface proceeds upward of the pot 6 It is supposed to

A wiping nozzle 10 and a plate warpage measuring device 12 are provided on the downstream side of the sink roll 20 in the transport direction of the metal plate 2 (hereinafter, also simply referred to as “downstream side”).

The wiping nozzle 10 may include, for example, a slit extending along the width direction of the metal plate 2 and opening toward the pass line of the metal plate 2. The wiping nozzle 10 ejects a gas toward the metal plate 2 to be conveyed, for example, from the above-mentioned slit, so that the thickness of the molten metal on the surface of the metal plate 2 becomes uniform. It is configured to be removed by blowing away the deposited molten metal.

The plate warpage measuring device 12 is a device that measures the amount of warpage of the metal plate 2 at the installation position of the plate warpage measuring device 12 and may be provided upstream or downstream of the wiping nozzle 10. The board warpage measurement device 12 may include, for example, a plurality of position sensors arranged along the width direction of the metal plate 2 and configured to be able to measure the distance to the metal plate 2.
As described later, the plate warpage correction apparatus 1 according to some embodiments may be configured to correct the board warpage based on the measurement result of the board warpage measurement device 12.

Note that at least some of the plurality of rolls 14 provided inside the furnace 3 described above are configured to change the transport direction of the transported metal plate 2 during the normal operation of the continuous plating processing facility 100. . In a roll in which the transport direction of the metal plate 2 is changed, the metal plate 2 is normally wound around the roll. For example, in a roll in which the transport direction of the metal plate 2 is changed by 90 ° or more, It can be easily confirmed visually that the metal plate is wound. As described above, in the state in which the metal plate 2 is wound around the roll, the metal plate 2 usually has warpage (C warpage) in the sheet width direction.
"The metal plate 2 is wound around the roll 14" means that the bending diameter of the metal plate 2 matches the diameter of the roll 14, that is, the metal plate 2 is in contact with the roll 14 in a plane. It means that.

In addition, at least some of the plurality of rolls 14 are fixed rolls in which the position of the rotation shaft of the roll 14 is fixed during the normal operation of the continuous plating apparatus 100.

Next, with reference to FIGS. 1 to 3, the plate warp correction device 1 applied to the above-described continuous plating apparatus 100 will be described.
FIG. 2 is a schematic view of the plate warpage correction device 1 according to an embodiment, and FIG. 3 is a view for explaining a plate warpage amount w of the metal plate 2. The conveyance direction at the position of the wiping nozzle 10 2 shows a cross section of the metal plate 2 in a plane perpendicular to the above. 2 is a partial enlarged view of the continuous plating apparatus 100 shown in FIG. 1, but in FIG. 2, the furnace 3 and the snout 5 shown in FIG. 1 are omitted for convenience of explanation. doing.

As shown in FIG.1 and FIG.2, the board curvature correction apparatus 1 which concerns on one Embodiment is arrange | positioned in the pot 6 in the downstream rather than the bridle roll 16B which is a fixed roll which changes the conveyance direction of the metal plate 2. A sink roll 20 and a correction roll 18 disposed between the bridle roll 16B (fixed roll) and the sink roll 20 are provided. The correction roll 18 is provided above the plating bath 8 and may be provided inside the snout 5 as shown in FIG.
The bridle roll 16B is one of the bridle rolls 16A and 16B provided at the outlet 4 of the furnace 3 and located on the downstream side.

The correction roll 18 can adjust the pressing amount d2 (see FIG. 2) to the metal plate 2 side (or to the pass line side of the metal plate 2) by moving the rotation shaft 19 of the correction roll 18 It is configured. As shown in FIGS. 1 and 2, the correction roll 18 is provided on the opposite side to the bridle roll 16 B (fixed roll) and the sink roll 20 with the metal plate 2 interposed therebetween.
In FIG. 2, the correction roll 18 and the metal plate 2 when the amount of depression d2 is zero are shown by broken lines. At this time, the metal plate 2 is not pushed into the correction roll 18, and the bridle roll 16B and It has a linear shape with the sink roll 20.

The correction roll 18 has an apparent diameter D2 corresponding to the pressing amount d2. The apparent diameter D2 of the correction roll 18 is a value defined by twice the reciprocal of the curvature of the metal sheet 2 in the vicinity of the contact portion between the metal sheet 2 and the correction roll 18. The apparent diameter D2 is influenced by both geometrical conditions such as correction roll, fixed roll, thickness of sheet, sheet width, etc. and mechanical properties such as Young's modulus, yield stress and sheet tension of sheet 2 Although it is received, it is adjustable from the actual diameter of the correction roll 18 (the state where the metal plate 2 is wound around the roll 18) to infinity (the state in which the pushing amount d2 is zero) by adjusting the pushing amount d2.

Here, FIG. 8 is a diagram for explaining an example of a method of calculating the apparent diameter D2.
The apparent diameter D2 of the correction roll 18 is, for example, as shown in FIG. 8, any two directions orthogonal to each other in the vertical plane including the extending direction of the metal plate 2 are the x axis and the y axis. With regard to the bending shape of the metal plate 2 in the plane, an approximate curve which is a function of y = f (x) is created before and after the contact point Pc (a state close to a point contact in a side view) of the metal plate 2 and the pressing roll. The radius of curvature is determined by second-order differentiation of this approximate curve with respect to x in the vicinity of the contact portion between the plate and the roll, and twice the radius of curvature becomes the apparent diameter D2.
The curve of the metal plate 2 in the vertical plane described above can also be obtained based on continuous measurement of the side surface height of the metal plate 2 with respect to a certain horizontal line or information processing of the photograph of the side surface of the metal plate 2. It is possible.
However, in the actual operation of the plate warp correction device 1, it is not necessary to measure the radius of curvature, and by adjusting the pressing amount d2 of the correction roll 18, as a result, the apparent radius D2 of an appropriate range It can be in the state of

In the plate warp correction device 1 shown in FIGS. 1 and 2, the ratio D3 / D1 of the diameter D3 of the sink roll to the diameter D1 of the bridle roll 16B (fixed roll) is 1.5 or more.
1 and 2, the diameter D1 of the bridle roll 16B (fixed roll), the apparent diameter D2 of the correction roll 18, and the diameter D3 of the sink roll 20 are D1 <D2 <D3. Meet the relationship.

In the continuous plating apparatus 100 described above, the plate warp in the plate width direction (in the plate width direction as shown in FIG. 3) on the outlet side of each of the bridle roll 16B (fixed roll), the correction roll 18, and the sink roll 20. Warpage in which the central portion protrudes in the thickness direction as compared to both ends in the width direction, that is, C warpage may occur.
Here, the plate warpage amount w (see FIG. 3) of the metal plate 2 in the present specification means the distance in the plate width direction of both end points of the metal plate 2 in the plate thickness direction.

The direction of deformation of the warp in the plate width direction given to the metal plate 2 by each of the rolls described above (protrusion direction of the central portion in the plate width direction of the metal plate 2) depends on the positional relationship between the rolls and the metal plate 2 It is decided.
For example, as shown in FIG. 3, in the plate warp correction device 1 shown in FIGS. 1 and 2, when both surfaces of the metal plate 2 are the first surface 2a and the second surface 2b, the bridle roll 16B (fixed roll) and sink The warpage in the plate width direction given to the metal plate 2 by the roll 20 is a warpage in a direction in which the central portion of the metal plate 2 protrudes toward the first surface 2a in the plate thickness direction (that is, the direction shown in FIG. 3) The warpage in the plate width direction given to the metal plate 2 by the correction roll 18 is the warpage in the direction in which the central portion of the metal plate 2 protrudes toward the second surface 2b in the plate thickness direction (that is, the direction shown in FIG. 3) Reverse direction).

If the metal plate 2 has the above-described plate warp in the plate width direction at the position of the wiping nozzle 10 on the downstream side of the sink roll 20, the distribution in the distance between the wiping nozzle 10 and the metal plate 2 in the plate width direction is It occurs. Then, according to the distance between the wiping nozzle 10 and the metal plate 2, the amount of molten metal (plating solution) blown off by the wiping nozzle 10 is not uniform in the plate width direction. For example, where the distance between the wiping nozzle 10 and the metal plate 2 is large, the amount of molten metal (plating solution) blown down by the wiping nozzle 10 is reduced, so the plating thickness is increased. Conversely, where the distance between the wiping nozzle 10 and the metal plate 2 is small, the amount of molten metal (plating solution) blown off by the wiping nozzle 10 increases, so the plating thickness becomes thinner. Thus, if the plating thickness is not uniform, trying to secure the plating thickness at the minimum part leads to an increase in the cost of the thick plating. In addition, unevenness in the plating thickness of the metal plate 2 may cause unevenness in weldability (welding strength) when welding the metal plate in the later step, and the metal plate 2 may be used as a product. It leads to quality deterioration.

In this respect, according to the plate warp correction device 1 according to the above-described embodiment, the ratio D3 / D1 of the diameter D3 of the sink roll 20 to the diameter D1 of the bridle roll 16B (fixed roll) is set to 1.5 or more. Therefore, as described below with reference to FIGS. 4 to 7, it is possible to effectively correct the board warpage in the board width direction on the exit side of the sink roll 20.

Here, FIG. 4 and FIG. 5 show the correlation between the plate warpage amount w of the metal plate 2 on the outlet side of the sink roll 20 of the board warpage straightening device 1 according to one embodiment and the diameter D3 of the sink roll 20. It is a graph which shows an example, and when plate thickness t of metal plate 2 is 3.2 mm and 2.3 mm, and diameter D1 = 800 mm of bridle roll 16B (fixed roll), respectively, apparent diameter D2 of correction roll 18 is shown. The range of the amount of board warpage w that can occur when (the pressing amount d2) is changed between 800 mm and 2000 mm is indicated by hatching. In any of the figures, the smaller line of the plate warpage amount w shows the case of D2 = 800 mm, and the larger line of the plate warpage amount w shows the case of D2 = 2000 mm.

From the graphs of FIG. 4 and FIG. 5, the adjustable width of the plate warpage amount w can be adjusted by the apparent diameter D 2 (or the pressing amount d 2) of the correction roll 18 as the sink roll diameter D 3 becomes larger regardless of the board thickness t. It can be understood that the plate warpage w can be easily adjusted to 0 by enlarging.

Moreover, FIG.6 and FIG.7 is each correlating with the board curvature amount w of the metal plate 2 in the sink roll 20 delivery side of the board curvature correction apparatus 1 which concerns on an Example and a comparative example, and the apparent diameter D2 of the correction roll 18. It is a graph which shows an example of a relation. 6 shows the case where the diameter D1 of the bridle roll 16B (fixed roll) is 800 mm, the diameter D3 of the sink roll 20 is 2000 mm, and D3 / D1 is 2.5 in the above-described plate warp correction device 1, FIG. In the above-mentioned board curvature correction device 1, it is a graph at the time of being referred to as D1 = 800 mm, D3 = 900 mm, and D3 / D1 = 1.1. In the graph, t represents the thickness of the metal plate 2.

From the graph of FIG. 7, in the case of the plate warp correction device set to D3 / D1 = 1.1, when the plate thickness is t = 1 to 2 mm and relatively thin, the apparent diameter D2 of the correction roll 18 is properly adjusted (Ie, by appropriately adjusting the pressing amount d2 of the correction roll 18), it is possible to reduce the amount of board warpage in the sheet width direction on the outgoing side of the sink roll 20 to near zero while the board thickness is t = If the size is relatively large at about 3 to 4 mm, it can be seen that the amount of board warpage in the board width direction can not be reduced to near zero even if the apparent diameter D2 of the correction roll 18 is adjusted.
On the other hand, according to the graph of FIG. 6, in the plate warpage correction device set to D3 / D1 = 2.5, the apparent diameter of the correction roll 18 in a relatively wide plate thickness range of t = 1.2 mm or more and 4.5 mm or less It is possible to reduce the amount of board warpage in the sheet width direction on the exit side of the sink roll 20 to near zero by appropriately adjusting D2 (that is, by appropriately adjusting the pressing amount d2 of the correction roll 18) Recognize.

That is, as the ratio D3 / D1 of the diameter D3 of the sink roll 20 to the diameter D1 of the bridle roll 16B (fixed roll) is increased, the apparent diameter D2 (or the pressing amount d2) of the correction roll 18 is adjusted. It can be seen that the thickness t of the metal plate 2 capable of bringing the amount of plate warpage close to zero can be increased.

Based on these findings, in the plate warp correction device 1 according to the above-described embodiment, the ratio D3 / D1 of the diameter D3 of the sink roll 20 to the diameter D1 of the bridle roll 16B (fixed roll) is set to 1.5 or more. Therefore, by appropriately adjusting the apparent diameter D2 (or the pressing amount d2) of the correction roll 18, the metal plate 2 at the outlet side of the pot 6 even if the thickness t of the metal plate 2 is relatively large. The warpage amount w in the sheet width direction can be effectively reduced to correct the board warpage of the metal plate 2.
Therefore, it becomes easy to equalize the adhesion amount of the molten metal on the surface of the metal plate 2 by the wiping nozzle 10 grade | etc., Provided downstream of the metal plate conveyance direction rather than the pot 6, for example.

When the diameter D1 of the bridle roll 16B (fixed roll), the apparent diameter D2 of the correction roll 18 and the diameter D2 of the sink roll 20 satisfy the relationship of D1 <D2 <D3 in the plate warp correction device 1, the bridle roll 16B The amount of plastic deformation given to the metal plate 2 by each of the (fixed roll), the correction roll 18, and the sink roll 20 increases in the order of the sink roll 20, the correction roll 18, and the bridle roll 16B (fixed roll). Therefore, the board warpage of the metal plate 2 on the outlet side of the sink roll 20 can be effectively corrected in the adjustment range of plastic deformation in the correction roll 18.

In some embodiments, the plate warpage correction device 1 is configured to adjust the pressing amount d2 of the correction roll 18 to the metal plate 2 side based on the measurement result of the plate warpage amount by the plate warpage measurement device 12 The controller may further include a controller (not shown).
For example, the controller described above performs the feedback control based on the plate warpage amount w at the outlet side of the sink roll 20 measured by the board warpage measurement device 12 so that the plate warpage amount w approaches zero, the metal plate 2 of the correction roll 18 You may be comprised so that the pushing amount d2 to the side may be adjusted.
As described above, in the case where the plate warpage measurement device 12 includes a plurality of position sensors arranged along the plate width direction of the metal plate 2 and configured to be able to measure the distance to the metal plate 2, respectively. The controller calculates the plate warpage amount w on the exit side of the sink roll 20 of the metal plate 2 from the detection results of the plurality of position sensors, and based on the plate warpage amount w calculated in this manner, the metal of the correction roll 18 You may be comprised so that the pushing amount d2 to the board 2 side may be adjusted.

The outline of the board warp correction device 1 and the continuous plating apparatus 100 according to some embodiments will be described below.

(1) A plate warp correction device for a metal plate according to at least one embodiment of the present invention,
An apparatus for correcting warpage of a metal plate, which is used in a continuous plating treatment facility for a metal plate, comprising:
A sink roll disposed in a molten metal pot for plating on the downstream side of the transport direction of the metal plate with respect to a fixed roll for changing the transport direction of the metal plate;
And a correction roll disposed between the fixed roll and the sink roll for correcting the warp of the metal plate,
The ratio D3 / D1 of the diameter D3 of the sink roll to the diameter D1 of the fixed roll is 1.5 or more.

When deformation is applied to the metal plate in the order of the fixed roll, the correction roll and the sink roll described above, the metal plate warps in the sheet width direction (hereinafter referred to as “C warp” or simply “warp”) on the outlet side of each roll May occur. According to the findings of the present inventors, as the ratio D3 / D1 of the diameter D3 of the sink roll to the diameter D1 of the fixed roll is increased, the apparent diameter D2 of the correction roll is adjusted, The adjustable width of the amount of warpage of the plate can be expanded, and the thickness of the metal plate capable of bringing the amount of warpage of the plate close to zero can be increased.
In this respect, in the configuration of the above (1), since D3 / D1 is 1.5 or more, by appropriately adjusting the apparent diameter D2 of the correction roll, even if the plate thickness is relatively large, melting is possible Warpage in the sheet width direction of the metal plate on the outlet side of the metal pot can be effectively reduced to correct the warpage of the metal plate.
Therefore, it becomes easy to equalize the amount of adhesion of the molten metal on the surface of the metal plate, for example, by gas wiping or the like on the downstream side in the metal plate conveyance direction than the molten metal pot.

In addition, unlike the said (1), when providing the correction | amendment roll for correcting the curvature in the molten metal pot delivery side in the molten metal pot of the downstream side rather than a sink roll, the bearing of a correction | amendment roll is It is necessary to secure a large gap to prevent biting. In this case, backlash is likely to occur due to the gap between the bearings, and it is difficult to correct the warp of the metal plate with high accuracy.
In this respect, in the configuration of the above (1), the correction roll is disposed between the fixed roll and the sink roll (that is, upstream of the sink roll in the conveying direction of the metal plate). There is no need to For this reason, a bearing with little rattling can be adopted, and the amount of warpage of the metal plate can be adjusted with high accuracy. In addition, since it is possible to abolish the correction roll in the molten metal pot, a sink roll having a larger diameter is adopted without increasing the size of the existing molten metal pot on the premise of installing the correction roll in the pot. can do.

In addition, the "fixed roll" in the above (1) may be a roll that has been a main cause of plate warpage that occurs in the metal plate on the exit side of the sink roll. That is, the "fixed roll" in the above (1) may be the bridle roll 16B in the above-described plate warp correction device 1 or another roll 14 fixed inside the furnace 3. Further, the “fixed roll” in the above (1) may be a fixed roll positioned on the most downstream side among fixed rolls that change the transport direction of the metal plate.

(2) In some embodiments, in the configuration of (1) above,
The correction roll is capable of adjusting the pressing amount of the correction roll to the metal plate side.

According to the configuration of (2), the plastic deformation of the metal plate by the correction roll is adjusted by adjusting the pressing amount of the correction roll to the metal plate side (that is, by adjusting the apparent diameter D2 of the correction roll). The amount can be varied. Therefore, the warpage of the metal plate in the plate width direction on the outlet side of the molten metal pot can be effectively corrected by appropriately adjusting the amount of pressing.

(3) In some embodiments, in the configuration of (1) or (2) above,
The relationship of D1 <D2 <D3 holds, where D2 is the apparent diameter of the correction roll corresponding to the amount of depression of the correction roll toward the metal plate.

According to the configuration of the above (3), the plastic deformation amount given to the metal plate by each of the fixed roll, the correction roll and the sink roll increases in the order of the sink roll, the correction roll and the fixed roll. Therefore. Warpage of the metal plate on the delivery side of the molten metal pot can be effectively corrected within the adjustment range of plastic deformation in the correction roll.

(4) In some embodiments, in any of the configurations of (1) to (3) above,
The diameter D3 of the sink roll is at least 1200 mm.
Alternatively, in some embodiments, in any of the configurations (1) to (3), the diameter D3 of the sink roll is 1300 mm or more.

Usually, the diameter of the sink roll provided in the molten metal pot is at most about 1000 mm. And when it is going to adopt a sink roll of larger diameter, related facilities other than a sink roll (for example, molten metal pot etc. which a sink roll is accommodated) also need to adopt a bigger thing, and equipment cost Increases.
According to the configuration of the above (4), in spite of the above-mentioned circumstances, since the sink roll having a diameter of 1200 mm or more or 1300 mm or more, which is much larger than usual, is employed, a fixed roll of typical size is obtained. When used, it is easy to set D3 / D1 to 1.5 or more. Thus, by appropriately adjusting the apparent diameter D2 of the correction roll, even if the plate thickness is relatively large, the warpage in the plate width direction of the metal plate on the delivery side of the molten metal pot is effectively corrected. be able to.

(5) In some embodiments, in any of the configurations of (1) to (4) above,
The fixed roll is installed inside a furnace for heat treatment of the metal plate.

According to the configuration of the above (5), when the fixed roll is installed inside a furnace (for example, an annealing furnace etc.) for heat-treating the metal plate, as described in the above (1), By appropriately adjusting the apparent diameter D2, even in the case where the plate thickness is relatively large, it is possible to effectively correct the warp in the plate width direction of the metal plate on the outlet side of the molten metal pot.

(6) In some embodiments, in the configuration of (5) above,
A fixed roll is provided at the outlet of the furnace.

A plurality of rolls may be provided inside the heating furnace for the metal plate in order to transport the metal plate while changing the direction appropriately, and the rolls provided at the outlet of the furnace are the rolls among the plurality of rolls. , And the roll provided on the most downstream side. And the roll provided at the most downstream side tends to become the dominant cause of the board curvature of the board width direction in the entrance side of a correction roll.
In this respect, according to the configuration of the above (6), it is possible to effectively correct the warpage in the sheet width direction which is dominantly formed by the fixed roll provided at the outlet of the furnace by the correction roll and the sink roll. it can.

(7) In some embodiments, in any of the configurations of (1) to (6) above,
A fixed roll is a bridle roll for adjusting the tension given to a metal plate.

The bridle roll is usually provided at the outlet of the furnace, and tends to be a dominant cause of board warpage in the board width direction at the entrance side of the correction roll.
According to the configuration of the above (7), it is possible to effectively correct the warpage in the sheet width direction mainly formed by the bridle roll by the correction roll and the sink roll.

(8) In some embodiments, in any of the configurations (1) to (7),
The straightening roll is provided inside the snout provided between the outlet of the furnace for heat treatment of the metal plate and the molten metal pot.

(9) In some embodiments, in the configurations of (1) to (8) above,
The metal plate warp correction device is
A plate warpage measuring device provided downstream of the sink roll in the transport direction;
A controller configured to adjust the apparent diameter D2 of the correction roll by controlling the pressing amount of the correction roll to the metal plate side based on the measurement result of the plate warpage measuring device;
Further comprising

According to the configuration of the above (9), the controller controls the pressing amount of the correction roll to the metal plate side based on the measurement result of the plate warpage measuring device to adjust the apparent diameter D2 of the correction roll. By appropriately adjusting the apparent diameter D2 of the correction roll, it is possible to effectively correct the warp in the sheet width direction of the metal sheet.

(10) A continuous plating treatment facility for a metal plate according to at least one embodiment of the present invention includes the plate warp correcting device according to any one of (1) to (9).

According to the configuration of the above (10), since D3 / D1 is 1.5 or more, the molten metal can be obtained even when the plate thickness is relatively large by appropriately adjusting the apparent diameter D2 of the correction roll. Warpage of the metal plate in the plate width direction on the outlet side of the pot can be effectively reduced to correct the warpage of the metal plate.
Therefore, it becomes easy to equalize the amount of adhesion of the molten metal on the surface of the metal plate, for example, by gas wiping or the like on the downstream side in the metal plate conveyance direction than the molten metal pot.

As mentioned above, although embodiment of this invention was described, this invention is not limited to embodiment mentioned above, The form which added deformation | transformation to embodiment mentioned above, and the form which combined these forms suitably are also included.

In the present specification, a representation representing a relative or absolute arrangement such as "in a direction", "along a direction", "parallel", "orthogonal", "center", "concentric" or "coaxial" Not only represents such an arrangement strictly, but also represents a state of relative displacement with an tolerance or an angle or distance that can obtain the same function.
For example, expressions that indicate that things such as "identical", "equal" and "homogeneous" are equal states not only represent strictly equal states, but also have tolerances or differences with which the same function can be obtained. It also represents the existing state.
Furthermore, in the present specification, expressions representing shapes such as a square shape and a cylindrical shape not only indicate shapes such as a square shape and a cylindrical shape in a geometrically strict sense, but also within the range where the same effect can be obtained. Also, the shape including the uneven portion, the chamfered portion, and the like shall be indicated.
Moreover, in the present specification, the expressions “comprising”, “including” or “having” one component are not exclusive expressions excluding the presence of other components.

DESCRIPTION OF SYMBOLS 1 board curvature correction apparatus 2 metal plate 2a 1st surface 2b 2nd surface 3 furnace 4 exit part 5 snout 6 pot (molten metal pot)
8 plating bath 10 wiping nozzle 12 plate warpage measuring device 14 roll

16A bridle roll

16B bridle roll 17 virtual roll 18 correction roll 19 rotating shaft 20 sink roll 100 continuous plating processing equipment d2 pushing amount w plate warpage amount

Claims

An apparatus for correcting warpage of a metal plate, which is used in a continuous plating treatment facility for a metal plate, comprising:
A sink roll disposed in a molten metal pot for plating on the downstream side of the transport direction of the metal plate with respect to a fixed roll for changing the transport direction of the metal plate;
And a correction roll disposed between the fixed roll and the sink roll for correcting the warp of the metal plate,
The plate warp correction device for a metal plate, wherein a ratio D3 / D1 of a diameter D3 of the sink roll to a diameter D1 of the fixed roll is 1.5 or more.
The apparatus for correcting plate warpage of a metal plate according to claim 1, wherein the correction roll is capable of adjusting the pressing amount of the correction roll to the metal plate side.
The metal according to claim 1 or 2, wherein a relation of D1 <D2 <D3 holds, where D2 is an apparent diameter of the correction roll corresponding to an amount of depression of the correction roll toward the metal plate. Board warpage straightening device.
The plate warp correction device for a metal plate according to any one of claims 1 to 3, wherein a diameter D3 of the sink roll is 1200 mm or more.
The said fixed roll was installed in the inside of the furnace for heat-processing the said metal plate, The board curvature correction apparatus of the metal plate as described in any one of the Claims 1 thru | or 4 characterized by the above-mentioned.
The said fixed roll is provided in the exit part of the said furnace, The board curvature correction apparatus of the metal plate of Claim 5 characterized by the above-mentioned.
The said fixed roll is a bridle roll for adjusting the tension given to the said metal plate, The board curvature correction apparatus of the metal plate as described in any one of the Claims 1 thru | or 6 characterized by the above-mentioned.
The said correction | amendment roll was provided in the inside of the snout provided between the exit part of the furnace for heat-processing the said metal plate, and the said molten metal pot. The board curvature correction apparatus of the metal plate as described in 1 paragraph.
A plate warpage measuring device provided downstream of the sink roll in the transport direction;
A controller configured to adjust a pressing amount of the correction roll toward the metal plate based on a measurement result of the plate warpage measuring device;
The board curvature correction apparatus of the metal plate as described in any one of the Claims 1 thru | or 8 further equipped with.
An apparatus for continuous plating of a metal plate comprising the plate warp correction device according to any one of claims 1 to 9.