JP2002263724A - Apparatus and method for cooling steel plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cool a steel plate by a wet jet so as to uniform temperature distribution in the width direction of the steel plate. SOLUTION: In the apparatus and method for cooling a rolled steel plate, the steel plate is cooled by arranging masking plates 2, 3 on which a flowing- water decelerating member or a brush 22 is attached onto the upper and lower surfaces of the steel plate in the positions of edge parts in the width direction of the steel plate 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel sheet cooling apparatus for cooling a steel sheet by a jet stream using water as a cooling medium, following the hot rolling. The present invention relates to a cooling device and a method for cooling a steel plate using the same.

[0002]

2. Description of the Related Art Steel sheets manufactured by hot rolling are used to obtain predetermined material properties or to improve production efficiency.
Usually, controlled cooling is performed subsequent to hot rolling. As a method of controlled cooling, in many cases, a jet is formed by using water as a cooling medium and is caused to collide with a steel sheet to perform strong cooling accompanied by a boiling phenomenon. At that time, it is important to make the temperature distribution of the steel sheet uniform in order to obtain uniform mechanical properties and shapes. In order to make the temperature distribution in the sheet width direction of the steel sheet uniform, cooling is normally performed by making the distribution of the jet flow rate in the sheet width direction uniform. At the edge of the sheet width as shown at C, the temperature rapidly decreases toward the end.

[0003] For this reason, several proposals have conventionally been made for a cooling apparatus through cooling method for preventing the end temperature from lowering. For example, in JP-A-57-165114 and JP-A-58-32511, when cooling a steel plate, a gutter or the like that blocks collision of a water jet against the steel plate is provided to reduce the cooling at the end. It is disclosed.
Also, Japanese Patent Application Laid-Open No. 63-13610 discloses a method of controlling the amount of jet water in the plate width direction by increasing or decreasing the amount of cooling water in the vicinity of the steel plate end for each nozzle.

Further, Japanese Patent Application Laid-Open No. 10-216823 discloses that a drain plate is provided at both ends in the width direction of a steel plate, and an air injection nozzle is inserted into a gap between the steel plate and the central portion of the steel plate. A cooling device is disclosed, in which water is cut off by injecting air from the air injection nozzle toward the central portion of the steel plate, thereby preventing overcooling of both ends in the width direction of the steel plate. .

Further, Japanese Patent Laid-Open No. 2000-237815
Patent Document 1 discloses a cooling device for a steel sheet including a masking device having an upper masking plate for masking an upper surface of an end portion in a width direction of the steel plate, and a roll supporting the masking plate and smoothly following the steel plate. By keeping the distance between the steel plate and the masking plate constant, it is possible to prevent overcooling at both ends in the plate width direction while operating stably.

[0006]

Among these conventional proposals, Japanese Patent Application Laid-Open No. 57-165114 and Japanese Patent Application Laid-Open
In the method disclosed in Japanese Patent No. 32511, the average temperature of the steel plate at the end is increased due to the interruption of the water jet at the end in the plate width direction. Since the water is drained from the extreme end in the width direction after passing through the end in the width direction, the end of the width direction is still cooled by the drained water, and the temperature of the steel sheet at the end is still the extreme end. It is inevitable that it drops toward the part.

In the apparatus disclosed in Japanese Patent Application Laid-Open No. 63-13610, the amount of cooling water in the vicinity of the end of the steel sheet is increased or decreased for each nozzle to control the amount of jet water in the width direction of the steel sheet. This is advantageous in controlling the jet water distribution in the direction, but after the cooling water collides with the steel sheet, it passes through the edge in the sheet width direction and is drained from the end in the sheet width direction. Cannot solve the problem of cooling. In addition, equipment costs such as controlling the amount of water for each nozzle increase.

Furthermore, in the apparatus described in Japanese Patent Application Laid-Open No. Hei 10-216823, the infiltration of water is achieved by injecting air into a drain plate provided at both ends in the plate width direction and a gap between the drain plate and the steel plate. Although it is prevented, the air to be injected is at a high pressure and requires a considerable flow rate (in the embodiment, 200 to 300
Nl / min m), and the airflow cools the steel sheet, resulting in overcooling of both ends in the sheet width direction. To prevent such supercooling, hot air of 500 ° C. or more is required, but it is extremely uneconomical. For this reason, the same device configuration can be used on the lower surface side of the steel sheet, but since doing so makes it impractical because it is too economical, such a device configuration is adopted on the lower surface side of the steel plate. However, despite the problem that both ends in the width direction of the sheet are supercooled, the apparatus still cools the lower surface of the steel sheet with a jet using water as a cooling medium. In addition, when the draining plate was thermally deformed, there was a problem that the gap was widened and the air pressure was relatively reduced, and the water could not be sufficiently drained because the water could not be sufficiently drained. . In addition, because the structure is such that the draining plate does not smoothly follow the steel plate, it is not possible to sufficiently cope with the thickness distribution of the scale during cooling, and it is difficult to maintain the distance between the steel plate and the draining plate, When the gap between the steel plate and the draining plate widens, the air pressure (air volume) relatively decreases, and water penetrates into the gap, making it difficult to exhibit the effect of preventing supercooling at both ends in the width direction of the plate. . Conversely, when the gap is narrowed, the air injection nozzle is pressed against the steel plate, and the nozzle is deformed, so that there is a problem that air injection cannot be performed. Furthermore, it is very difficult to control the amount of air injected from the tip of the draining board, and depending on the adjustment of the injection amount and the injection pressure, the water flowing from the center in the width direction of the board is pushed back, and the water is drained above the draining board. Instead, the water is drained along the front or rear surface of the steel plate, bypassing the draining plate, or the cooling water stays at the center in the width direction of the steel plate for a long time. There were problems such as that the supercooling could not be sufficiently prevented, and that the temperature in the central portion was lowered.

Further, Japanese Patent Laid-Open No.
In the apparatus described in JP-A-00-237815, the gap between the masking plate and the steel plate is controlled by a copying roll, and the masking plate is provided with a gap between the masking plate and the steel plate at the center in the plate width direction. Is formed so as to narrow (see FIGS. 2 and 6 of the publication), but there is still a small gap from which water, particularly cooling water at the center in the width direction of the plate, collides with the steel plate. After that, flowing water drained from the end in the width direction of the sheet passing through the end in the width direction of the sheet enters, so that the cooling rate can be slightly distributed at both ends in the width direction, particularly at the end (corner). It was found that uniformity in shape, shape and material could not be partially achieved. Also, if the masking plate is brought into contact with the steel plate to prevent the inflow of flowing water, it may be heated and deformed by the heat of the steel plate, and the gap between the masking plate and the steel plate may be expanded. It has been found that the function of preventing overcooling of the end portion in the plate width direction cannot be sufficiently exhibited.

Accordingly, an object of the present invention is to solve such a problem, and provide a steel sheet cooling apparatus and a cooling method for cooling a steel sheet by a jet using water as a cooling medium, following hot rolling. And a cooling method of the steel sheet for uniformly cooling the temperature distribution in the width direction of the steel sheet.

[0011] In addition to the above objects, the present invention provides a cooling method in which the temperature distribution in the width direction of the steel sheet is uniform even when the thickness distribution of the scale is present on the surface of the steel sheet during cooling or when the masking plate is thermally deformed. And a cooling method for the steel sheet.

The present invention, in addition to the above objects, provides a cooling apparatus for a steel sheet which is more economical and has a higher industrial value, and a method for cooling the same.

[0013]

In view of the above problems, the present inventors have made intensive studies on a cooling apparatus and a cooling method for a steel sheet in order to achieve the above object, and as a result, have completed the present invention. Things. An object of the present invention is achieved by a steel plate cooling device and a cooling method described in the following (1) to (11).

(1) In a steel sheet cooling device that cools a steel sheet by a jet stream using water as a cooling medium subsequent to hot rolling, an interval between the steel sheet and the steel sheet is masked in order to mask the upper and lower surfaces of the steel sheet in the width direction. An upper and lower masking plate installed with a gap therebetween, and a flowing water reduction member that is attached to the plate surface of the upper and lower masking plate facing the steel plate and that reduces the flow velocity of the flowing water that enters the gap between the steel plate and the masking plate When,
A cooling device for a steel sheet, comprising a masking device having:

(2) In a steel plate cooling device that cools a steel plate with a jet stream using water as a cooling medium subsequent to hot rolling, an interval between the steel plate and the steel plate in order to mask an upper surface and a lower surface of an end portion in a width direction of the steel plate. A cooling device for a steel plate, comprising: a masking device having upper and lower masking plates provided with a brush attached to a plate surface side facing the steel plate with a gap between the plate and the steel plate.

(3) In the cooling device for a steel sheet, in order to mask the upper surface of the steel sheet in the width direction, the upper surface is provided above the steel sheet with an interval between them and the upper surface is provided on the side of the sheet surface facing the steel sheet. An upper masking plate to which a running water deceleration member or an upper brush is attached, an upper copying roll that supports the upper masking plate and smoothly follows the steel plate, and an upper support arm that supports the upper masking plate and the upper copying roll. The upper support arm is provided in the width direction of the steel sheet and / or
Or a plate having an upper drive device that is movable in the traveling direction, and a plate that is installed below and spaced from the steel plate, and faces the steel plate, in order to mask the lower surface of the steel plate in the width direction end. A lower masking plate having a lower surface water flow reduction member or a lower brush attached to the surface side, a lower copying roll supporting the lower masking plate and smoothly following the steel plate, and supporting the lower masking plate and the lower copying roll. A masking device comprising: a lower support arm; and a lower drive device that makes the lower support arm movable independently of the upper support arm in the width direction and / or the traveling direction of the steel plate. The cooling device for a steel sheet according to (1) or (2).

(4) The masking plate on the side where water flows into the gap between the steel plate and the masking plate has an inclined portion inclined so as to narrow the gap between the steel plate and the masking plate. The cooling device for a steel sheet according to any one of 3).

(5) The masking plate according to any one of (1) to (4), wherein a central portion in a width direction of the steel plate has an inclined portion inclined so as to narrow a gap with the steel plate. 4. A cooling device for a steel sheet according to any one of the above.

(6) The above (4) or (5), wherein the flowing water moderating member or brush is attached to at least an inclined portion of the masking plate and a plate surface side facing the steel plate. Steel plate cooling system.

(7) The apparatus for cooling a steel sheet according to any one of the above (1) to (6), wherein a tip portion of the running water moderating member or the brush is substantially in contact with the surface of the steel sheet.

(8) A jet means for cooling the steel sheet with the jet using water as a cooling medium is provided with cooling nozzles arranged at predetermined intervals in the width direction of the steel sheet and / or in the width direction of the steel sheet. The cooling device for a steel sheet according to any one of the above (1) to (7), wherein the slit nozzle has an enlarged diameter.

(9) The upper and lower masking plates are portions other than a plurality of pairs of conveying rolls provided at appropriate intervals above and below the steel plate, and are substantially provided with an upper surface cooling nozzle. The steel sheet according to any one of the above (1) to (8), wherein the steel sheet is disposed so as to mask an end portion in the width direction of the steel sheet substantially immediately below the lower and lower cooling nozzles. Cooling system.

(10) After the hot rolling, a masking plate for masking the upper surface and the lower surface of the steel plate in the width direction at the time of cooling the steel plate with a jet using water as a cooling medium is arranged. Prevents the water jet from directly hitting the masking plate at the end in the direction, and masks much of the running water when the cooling water that collides with the steel plate passes through the end from the center in the plate width direction and drains from the end. The plate is made to flow on the plate surface side opposite to the plate surface side facing the steel plate, and further, a running water speed reduction member is attached to the plate surface side of the masking plate facing the steel plate, and penetrates into the gap between the steel plate and the masking plate. A method for cooling a steel sheet, comprising slowing down the flow rate of the running water and evaporating the flowing water.

(11) Subsequent to hot rolling, when cooling the steel sheet with a jet using water as a cooling medium,
A method for cooling a steel sheet, comprising using the cooling apparatus for a steel sheet according to any one of (9).

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION A cooling apparatus for a steel sheet according to the present invention is a cooling apparatus for a steel sheet, which cools the steel sheet by a jet using water as a cooling medium, subsequent to hot rolling. In order to mask the lower surface, an upper and lower masking plate that is installed at an interval from the steel plate, and the upper and lower masking plates are attached to a plate surface side facing the steel plate,
It is characterized by comprising a masking device having a flowing water deceleration member that slows down the flow velocity of flowing water that enters the gap between the steel plate and the masking plate.In other words, in the cooling device for the steel plate, In order to mask the upper surface and the lower surface of the end portion in the width direction of the steel plate, provided with a masking device having an upper and lower masking plate which is installed at an interval from the steel plate, and a brush is attached to the plate surface side facing the steel plate It can be said that it is characterized by the following.

In the cooling apparatus for a steel sheet according to the present invention, the upper and lower surfaces of the steel sheet in the width direction are masked by the cooling apparatus for cooling the steel sheet by a jet using water as a cooling medium. In order to do so, upper and lower masking plates that are installed at an interval from the steel plate, and are attached to the plate surface side of the upper and lower masking plates facing the steel plate,
It has a masking device that has a flowing water deceleration member that slows the flow velocity of flowing water that enters the gap between the steel plate and the masking plate.Using this device, the cooling range of the upper and lower surfaces of the steel plate in the width direction ends is independent. , It is possible to prevent overcooling of the steel sheet in the width direction end. Especially in the cooling range of the width direction end of the upper and lower surfaces of the steel plate,
By installing the running water deceleration member, the flow speed of the running water entering the gap between the steel plate and the masking plate can be freely adjusted (mainly the degree of deceleration), and the running water is evaporated at an appropriate position by the heat of the steel plate. Therefore, the flow rate can be arbitrarily adjusted and controlled so that the end of the steel sheet in the width direction is not overcooled (the flow rate can be reduced to zero). Cooling can be prevented.

In the method for cooling a steel sheet according to the present invention, a masking plate for masking an upper surface and a lower surface of an end portion in a width direction of a steel sheet when cooling the steel sheet by a jet using water as a cooling medium subsequent to hot rolling. So that the water jet does not directly hit the end of the steel sheet in the sheet width direction by the masking plate, and the cooling water colliding with the steel sheet passes through the end from the center in the sheet width direction and is drained from the end. Most of the running water flows on the plate surface side opposite to the plate surface side facing the steel plate of the masking plate, and further, a flowing water reduction member is attached to the plate surface side of the masking plate opposite to the steel plate, The method is characterized in that the flow velocity of the flowing water entering the gap between the masking plate and the masking plate is reduced, and the flowing water entering the space is evaporated.

In the method for cooling a steel sheet according to the present invention, as a cooling method using the above-described cooling device, the steel sheet is cooled in a jet width direction using water as a cooling medium in the width direction of the steel sheet after hot rolling. A masking plate for masking the upper and lower surfaces of the ends is arranged so that the water jet does not directly hit the ends of the steel plate in the width direction of the steel plate, and the cooling water that has collided with the steel plate ends from the center in the width direction of the steel plate. So that most of the flowing water when drained from the extreme end after passing through the portion flows on the plate surface side opposite to the plate surface side facing the steel plate of the masking plate, and further, the plate facing the steel plate of the masking plate By attaching a running water deceleration member to the surface side, delaying the flow rate of the running water entering the gap between the steel plate and the masking plate, and evaporating the flowing water, the water flow on the upper and lower surfaces of the steel plate in the width direction end of the steel plate cooling Can be eliminated, thereby,
By controlling the heat transfer coefficient at the end in the width direction of the steel sheet, overcooling can be prevented. Here, the heat removal amount Q per unit time per unit area, the relationship ΔT between the temperature difference between the steel sheet to be cooled and the cooling water, and the heat transfer coefficient h
Then, the following relationship is established, and the heat transfer coefficient h is a coefficient indicating the cooling capacity when the steel sheet temperature and the cooling water temperature are determined.

[0029]

(Equation 1)

Hereinafter, embodiments of the present invention will be described in detail.

In the present invention, in order to mask the upper surface and the lower surface of the end portion in the width direction of the steel plate, the position where the upper and lower masking plates are arranged at an interval from the steel plate in the steel sheet traveling direction (passing direction). The length and length are not particularly limited.
These are determined according to a desired cooling pattern, cooling conditions, and steel plate temperature uniformity. For example, when the masking plates are arranged at discontinuous positions in the steel sheet passing direction, a desired uniform cooling effect can be obtained at each position. Specifically, for example, when water is jetted by a cooling nozzle (for example, a spray nozzle or a slit nozzle), the position where the upper and lower masking plates are disposed in the steel sheet advancing direction (passing direction) is vertically positioned across the steel plate. Except for a plurality of pairs of transport rolls provided at appropriate intervals, the end portion in the width direction of the steel sheet substantially immediately below the upper surface cooling nozzle and substantially immediately below the lower surface cooling nozzle. Is desirably arranged so as to be masked. This is most effective in preventing overcooling of the steel sheet in the sheet width direction end by flowing water drained from the end part from the center part in the sheet width direction substantially immediately below or substantially directly above the cooling nozzle. Because it is effective.

In the present invention, the size of the masking plate arranged in the traveling direction of the steel sheet (the direction in which the steel sheet passes) is, for example, a case where the masking plate is rectangular (may have a partly inclined portion). Then, the length of the steel sheet in the sheet width direction may be a length capable of covering an end portion in the sheet width direction of the steel sheet as defined below, but preferably, the steel sheet thickness or the steel sheet temperature (installation position) It should be appropriately adjusted according to FIG. In addition, the length in the steel sheet advancing direction only needs to have a length capable of covering a water flow area formed by the jet from the cooling nozzle. Note that, even when a slit nozzle is used, the slit nozzle may be disposed so as to achieve the object of the present invention, similarly to the cooling nozzle.

Also, the upper and lower masking plates need only be installed above or below the steel plate at an interval from the steel plate.
Basically, it may be arranged parallel to the steel sheet surface, but since there is no thickness distribution of scale on the steel sheet surface, thermal deformation of the masking plate, etc., the steel plate must not collide with the masking plate, This is because it is necessary to provide a certain interval. Also, since it is not preferable from the viewpoint of preventing supercooling that a large amount of flowing water enters the gap between the steel plate and the masking plate, the masking plate at the portion where the flowing water enters the gap between the steel plate and the masking plate is preferably a steel plate. It is desirable to have an inclined portion that is inclined so as to narrow the gap between the two. For example, in the case of flowing water discharged from the extreme end through the end from the center in the width direction of the steel sheet, due to the jet water from the cooling nozzle arranged in the width direction of the steel sheet, It is desirable that the central portion of the masking plate in the width direction of the steel plate has an inclined portion that is inclined so as to narrow the gap with the steel plate (see FIGS. 2 and 6). As a result, the flow rate (flow velocity) into the gap between the steel plate and the masking plate
This is because it is limited by the narrowest gap at the tip of the masking plate. In addition, the tip inclined portion of the masking plate may be formed integrally by bending one masking plate or the like, or may be formed by fixing two components with an appropriate connecting member. In particular, in the case where the copying roll is provided, the masking plate is formed so as to be inclined (forming the inclined portion) so that the gap between the copying roll and the steel plate is narrower on the central side in the sheet width direction than the copying roll. This is desirable because it can suppress inflow of flowing water. However, when the inclined portion of the masking plate is brought into contact with the steel plate surface, when there is a scale thickness distribution on the steel plate surface in the plate width direction as shown in FIG. The steel sheet may hit the steel sheet strongly, causing problems such as scratching the steel sheet and the tip part being rolled up.Therefore, such scale thickness distribution on the steel sheet surface during the transfer of the steel sheet and thermal deformation of the masking plate In consideration of the above, it is preferable that the tip of the masking plate is inclined so as to have a certain distance from the surface of the steel plate. In other words, the thickness distribution of the scale of the steel sheet surface only in the traveling direction of the steel sheet can be said to be able to follow the change by the copying roll, so that no gap needs to be provided. However, as shown in FIG. When the distribution or the thermal deformation of the masking plate occurs, such a change cannot be followed only by the copying roll, and the tip of the inclined portion of the masking plate collides with the steel plate. Therefore, usually, the gap between the steel sheet surface and the masking plate is 1 to 10 mm, preferably 1 to 10 mm.
An interval of 5 mm is desirable. The upper limit of the gap is
If an excessively large interval is provided, the amount of flowing water that enters the gap increases, and even if the flow velocity can be reduced by the flowing water deceleration member or the brush, it cannot be sufficiently evaporated by the heat of the steel sheet. This is because water is drained, and there is a possibility that supercooling of the extreme end may occur.

The inclination angle of the inclined portion of the masking plate is set so that most of the water flow flowing on the surface of the steel plate smoothly flows on the surface of the masking plate opposite to the surface of the masking plate without stagnation. For example, the angle between the water surface of the masking plate parallel to the steel plate surface and the inclined portion on the copying roll is preferably 20 to 60 degrees.

The shape (form) of the upper and lower masking plates
Is not to be limited to a square as described above (partly having an inclined portion), so that the water jet does not directly hit the mask width plate at the end in the width direction of the steel plate, and When the cooling water that collides with the water passes through the edge from the center in the width direction of the plate and drains from the end, most of the flowing water flows on the plate surface opposite to the plate surface facing the steel plate of the masking plate Any shape can be used as long as it can be formed. For example, a rectangular masking plate may be left without providing a tip inclined portion,
In the case where the injection nozzle and the slit nozzle are used together, in order to provide an inclined portion on the side where water flows into a gap between the steel plate and the masking plate, for example, an inclined portion is provided on two sides of a rectangular masking plate. You may do so. In the present specification, in the case of simply the gap between the steel plate and the masking plate, it is to be determined which part indicates the gap by sufficiently considering the meaning and the purpose of use. (In many cases, the narrowest gap at the tip of the masking plate, which is the part that limits the amount of flowing water (flow velocity) to the gap as described above).

The material of the masking plate is preferably a material capable of withstanding high heat of the steel plate, withstanding mechanical stress from the deformed steel plate, and withstanding high heat from the steel plate and thermal shock due to cooling water. , Iron-based, aluminum-based metals (including alloys), and the like. In particular, heat resistance,
Iron-based metals (including alloys) which are excellent in durability, workability (especially easy to attach a running water moderating member or a brush), mechanical strength and the like, and which are versatile and economical are preferable. In addition, since it is desirable to be able to move by connecting to a driving device via a lower support arm, it is desirable to select a material having a small specific gravity so as to reduce the weight.

The thickness of the masking plate is not particularly limited. In addition, since it is desirable to be able to move by connecting to the drive device via the lower support arm, it is desirable to suppress the thickness within an allowable range so as to reduce the weight.

In the present invention, the "jet" formed by injecting water for cooling the steel sheet from a nozzle or the like means a jet called a spray or the like or a cylindrical flow called a laminar flow. If necessary, a flow colliding with a steel plate with a certain amount of momentum, such as a continuous flow, is a general term. In addition, examples of an apparatus (or means) for forming a jet by spraying water include an injection nozzle (spray nozzle) and a slit nozzle.

The arrangement of the device (or means) for forming a jet by injecting water is not particularly limited. For example, the arrangement of the steel plate at predetermined intervals in the width direction of the steel plate may be changed. Injection nozzles and the like may be arranged above and below (see FIG. 1), and slit nozzles and the like expanded in the width direction of the steel sheet may be arranged above and below the steel sheet. It can be said that it is sufficient to arrange the injection means so as to be suitable for the characteristics of the individual injection means.

The water used in the present invention may be general industrial water or clean water, and it can be said that there is no need to adjust the water temperature. In order to maintain a constant quality throughout the year, such water is used. Utilizing the waste heat generated in the steelmaking plant (for example, the waste heat of the hot wastewater used during the cooling may be used), and using the one that is constantly adjusted to a constant water temperature, This is advantageous because it also makes effective use of waste heat in a steelmaking plant.

In the present invention, the end in the sheet width direction means a portion within approximately 200 mm from the outermost end in the sheet width direction of the steel sheet toward the center in the sheet width direction. It means other parts than the end of the steel sheet in the width direction. Here, the reason why the diameter is set to approximately 200 mm is that, when the steel sheet is cooled by a jet using water as a cooling medium subsequent to hot rolling, a portion where a temperature decrease (unevenness) due to supercooling is observed is approximately 200 mm or less. Because there was. Therefore, due to the thickness of the steel sheet, etc., the temperature decreases due to supercooling (unevenness).
Since the portion where is seen fluctuates, preferably, from the temperature distribution in the width direction of the steel sheet as shown in FIG. 4, a portion where the temperature drop starts to be seen for each steel sheet having a different thickness is specified,
It is desirable to use the end in the plate width direction. Note that, in the description in the drawings, for example, one end of the upper and lower ends (four locations) of the plate width direction ends (and further, the upper surface side thereof) indicates the end in the width direction of the plate. Unless otherwise specified, the ends in the sheet width direction of the present invention refer to the upper and lower ends (four places) in the sheet width direction of the steel sheet.

Hereinafter, the principle of operation of the masking plate will be described with reference to the drawings. FIG. 2 is an explanatory diagram showing a rough flow of cooling water at the widthwise ends of the upper and lower surfaces of a steel plate when a masking plate is provided in the cooling device of the present invention, and FIG. It is explanatory drawing which shows the flow of the cooling water in the board width direction edge part of the upper and lower surfaces of the steel plate of the method. In FIG. 3, the water used for cooling gathered and all steel sheets 1
(In the figure, the water flows 17, 18 flowing from the central portion in the width direction of the steel sheet 1 toward the extreme end in the width direction of the steel plate 1 are indicated by arrows) and fall from the extreme end. At this time, the temperature distribution at the end in the width direction of the steel sheet 1 decreases toward the end in the width direction as indicated by a line C in FIG. As a cause of this, the present inventors have found that the corners (edges) at the ends in the width direction of the steel sheet are different from the center parts in the width direction of the steel sheet, and the cooling water increases, The cooling speed is higher than that of the central portion in the width direction of the steel sheet, so that the steel sheet is supercooled.

Therefore, the inventors have devised a method of disposing the masking plate in order to eliminate the heat transfer coefficient increasing factor. The method will be described with reference to FIG. That is, in FIG. 2, water flows 17 and 18 (indicated by arrows in the drawing) from the center in the width direction of the steel plate 1 to the end portion in the width direction of the steel plate 1.
The upper masking plate 2 at the end in the plate width direction
It is discharged above the masking plate 2. For this reason,
Means for eliminating most of the water flow 18 that cools the end of the steel sheet in the width direction, particularly the extreme end (corner) in the width direction, is provided. It is possible to control the cooling strength of the end (corner) intermittently (in the section where the masking plate is arranged) in the traveling direction of the steel plate (see FIG. 7). That is, it is possible to greatly reduce (eliminate) the above-described deviation of the cooling rate with an extremely simple and inexpensive device.

Next, the working principle of a flowing water moderating member or brush attached to the surface of the masking plate opposite to the steel plate, which slows the flow velocity of the flowing water entering the gap between the steel plate and the masking plate, will be described with reference to the drawings. It will be described based on the following. FIG. 9 is an explanatory diagram showing the flow of cooling water to the gap between the steel plate and the masking plate at the end in the width direction of the upper surface of the steel plate of the conventional cooling device using only the masking plate, and FIG. It is explanatory drawing which shows the flow of the cooling water to the clearance gap between a steel plate and a masking plate in the width direction edge part of the steel plate upper surface of the steel plate of the cooling device of this invention which attached the flowing water reduction member or brush to the plate.

In FIG. 9, the water used for cooling collects and flows all the way to the extreme end of the steel sheet, and falls from the extreme end. At this time, the steel plate 1
The upper masking plate 2 is installed above it at an interval,
And an inclined portion 2a in which the center of the upper masking plate 2 in the width direction of the steel plate 1 is inclined so as to narrow the gap with the steel plate 1.
By providing the upper masking plate 2 having the above, most of the flowing water when the cooling water colliding with the steel plate 1 passes through the end from the center in the width direction of the plate and is discharged from the extreme end as described above is masked. The plate 2 can be made to flow on the plate surface side opposite to the plate surface side facing the steel plate 1 and fall from the extreme end. At this time, it is practically difficult to provide the upper masking plate 2 so as to be almost in contact with the surface of the steel plate 1. As shown in FIG. 9, there is a certain distance between the steel plate 1 and the tip of the inclined portion 2a of the masking plate. It is necessary to provide an interval (gap). Otherwise, the tip of the inclined portion 2a of the masking plate 2 collides with the steel plate 1 due to the thickness distribution of the scale on the surface of the steel plate or the thermal deformation of the masking plate 2 and the like. This is because the tip of the inclined portion 2a of the plate 2 is deformed (lifted), the gap is widened, and the effect of preventing the supercooling of the end of the steel plate 1 in the width direction is significantly reduced. for that reason,
Flowing water 21 (indicated by an arrow in the drawing) intrudes from this gap to cool the end portion in the width direction of the plate, so that the line B shown in FIG.
As described above, the temperature at the end in the width direction of the steel sheet 1 decreases toward the end in the width direction. The reason for this is that, as described above, the flowing water 2 entering the gap from the center of the steel sheet 1 in the width direction of the steel sheet 1 approaches the end in the width direction of the steel sheet, in particular, the end (corner).
It was found that the steel plate was cooled at 1 and was cooled from the side surface at the extreme end, so that the cooling speed was higher than that of the central portion in the width direction of the steel plate, resulting in supercooling.

In order to further eliminate the heat transfer coefficient increasing factor, the inventors of the present invention have studied the cooling of a steel plate provided with a flowing water moderating member or brush on the inclined portion of the masking plate and on the surface of the plate facing the steel plate. The device and its cooling method were devised. The cooling device for the steel plate will be described with reference to FIG.

In FIG. 8, of the water flow from the central portion in the width direction of the steel plate 1 to the end portion in the width direction of the steel plate 1, flowing water 21 (from the gap between the steel plate 1 and the tip of the inclined portion 2a of the upper masking plate 2) flows. At the end in the width direction of the plate, a flow-reducing member is provided at an end inclined portion 2a of the upper masking plate 2 (a narrowed portion which is inclined to narrow the interval between the steel plate 1 and the upper masking plate 2). The flow resistance of the flowing water 21 is increased by attaching the brush 22 so that the tip of a wire (for example, a wire portion of the wire brush) constituting the flowing water moderating member or the brush 22 is almost in contact with the surface of the steel plate 1. Since the water is discharged by bypassing above the upper masking plate 2 without entering the gap, the amount of flowing water entering the gap decreases, and the flow velocity of the flowing water 21 entering the gap decreases, thereby reducing the amount of flowing water. Member or so that would evaporate at the hot steel plate 1 while passing through the mounting portion of the brush 22. For this reason, the water flow from the end in the width direction of the steel plate 1 to the extreme end (corner) (particularly, the water flow 21 entering from the gap between the steel plate 1 and the tip of the inclined portion 2a of the masking plate 2) Means for eliminating (evaporating) from the width direction end to the extreme end (corner)), and the sheet width of the steel sheet 1 including the extreme end (corner) in the sheet width direction It is possible to intermittently control the cooling intensity in the section at the end in the direction (in the section where the masking plate is arranged) (see FIG. 7). That is, the addition of a very simple device configuration (running water deceleration member or brush) eliminates the deviation of the cooling rate, makes the steel sheet temperature uniform, thereby improves the flatness of the steel sheet shape, and makes the material uniform and extremely useful. The effect was brought.

Further, a preferred embodiment of the present invention will be specifically described with reference to the drawings.

FIG. 1 is a schematic cross-sectional view of equipment for explaining an embodiment of a steel sheet cooling apparatus according to the present invention, as described above, in the width direction of the steel sheet. However, in FIG.
The overall outline of the steel plate cooling apparatus of the present invention (the details of the running water deceleration member or the brush attached to the main masking plate will be omitted here. The details will be described later with reference to FIGS. 6 and 8).

In FIG. 1, reference numeral 1 denotes a steel plate, 2 denotes an upper masking plate having an upper brush, 3 denotes a lower masking plate having a lower brush, and 13 denotes an upper masking plate position adjusting mechanism (the upper support arm 6 is movable). Components of the drive unit),
16 is a lower masking plate position adjusting mechanism (lower support arm 1)
1 is a movable component of the driving device), 4 is an upper cooling water header, 5 is an upper cooling nozzle, 6 is an upper support arm,
Reference numeral 7 denotes an upper masking moving base, 8 denotes a lower cooling water header, 9 denotes a lower cooling nozzle, 10 denotes a lower masking moving base, 11 denotes a lower support arm, and 12 denotes an upper surface water jet.

In FIG. 1, upper and lower masking plates 2 and 3 to which upper and lower brushes (not shown) are attached are upper and lower support arms 6 for supporting these masking plates 2 and 3 and a copying roll (not shown). , 11 and an upper and lower drive device that enables the upper and lower support arms 6, 11 to move independently of each other. for that reason,
By operating the driving device, the upper and lower masking plates 2 and 3 can be moved independently, so that the difference in cooling capacity between the ends (particularly corners) in the width direction of the different steel plates on the upper and lower surfaces. Control is possible. In detail, from the beginning of cooling, on the steel sheet, the copying roll is installed so that the roll axis is perpendicular to the traveling direction of the steel sheet, and on the copying roll, the masking plate portion except for the brush mounting portion is installed. In addition to FIG. 1, FIG.
As shown in (perspective view) and FIGS. 2 and 8 (cross-sectional views), the upper and lower masking support arms that support them, and the upper and lower masking support arms are independently movable in the plate width direction. What is necessary is just to connect with the drive device of an upper and lower surface. More specifically, the vertical masking movable frames 7, 10 shown in FIG.
Is installed above or below the surface of the steel sheet so as to be parallel to the surface of the steel sheet and parallel to the width direction of the steel sheet. At this time, by being provided above or below the cooling water header and the upper surface cooling nozzle, it is possible to prevent obstruction of the water jet. In addition, as a driving device that can freely move on the upper and lower masking movable frames 7 and 10, upper and lower masking plate position adjusting mechanisms 13 and 16 (for example, a slider driven by a stepping motor, etc., may be mentioned, but it is particularly limited to these. It is not a thing.) Is provided. Taking a slider driven by a stepping motor as an example of the masking plate position adjusting mechanism, the slider 1
Of the upper and lower support arms 6, 11 connected to 3, 3 and the masking plates 2, 3 and the profiling rolls (not shown), particularly, the tips of the masking plates 2, 3 are formed at the corners of the steel plate ( The home position is a position that is flush with the edge portion), and the number of pulses applied to the stepping motor is adjusted so that the slider (that is, the tip of the masking plate) moves toward the center in the width direction of the steel plate. The amount of advance (or the amount of retreat) can be controlled. The upper and lower masking plate position adjusting mechanisms 13 and 16 are provided at four positions at the upper and lower left and right ends, and can control the movement width independently of each other. Note that, in the present invention, the drive device described above should not be limited at all, and a conventionally known drive control technique can be used.

In FIG. 1, after the steel sheet 1 is hot-rolled, while being conveyed, the steel sheet 1 is cooled by collision of water jets from above and below and running water after the collision. Hereinafter, the operation when the steel plate 1 is cooled will be described in detail. The central portion of the steel plate 1 in the width direction is the upper surface water jet 12 injected from the upper surface cooling nozzle 5 through the upper surface cooling water header 4, and the upper surface water jet flows along the plate surface after colliding with the steel plate 1, and is at the end of the plate width. It is cooled by running water 14 (indicated by an arrow in the figure) drained from the section. Similarly, the central portion in the width direction of the lower surface of the steel plate 1 is aligned with the lower surface water jet 15 injected from the upper surface cooling nozzle 9 through the lower surface cooling water header 8 and along the plate surface after the lower surface water jet 15 collides with the steel plate 1. The water is cooled by flowing water 14 (indicated by an arrow in the figure) drained from the end of the width of the flow plate.

At this time, since the water flow 14 from the central portion in the width direction of the steel plate 1 to the end portion in the width direction of the steel plate 1 is not so large, the cooling capacity is the upper water jet 12 and the lower water jet 15.
The temperature distribution of the steel sheet at the center in the sheet width direction is relatively uniform even in normal cooling, as shown by lines A to C in FIG.

The action of cooling the end in the sheet width direction with respect to this will be described. In the following description, the upper and lower surfaces of the steel plate perform cooling in substantially the same manner, so that the entire description may be changed to the upper surface side as an example. Further, since the cooling effect is exerted on both ends of the steel sheet in substantially the same manner, the description may be changed to the whole description by taking only one end as an example.

First, a case will be described in which the present invention is not applied and cooling is performed only by making the distribution of the jet flow rate in the plate width direction uniform. The steel plate 1 is cooled by the upper surface water jet 12 injected from the upper surface cooling nozzle 5 through the upper surface cooling water header 4 and the water flow 18 discharged from the end of the steel plate 1 in FIG. The water flow 18 discharged from the end of the steel sheet 1 in the width direction increases the amount of water because the flowing water at the center in the width direction of the steel sheet is also added, and the effect on the cooling capacity appears.

Therefore, the temperature distribution of the steel sheet at the end in the sheet width direction greatly decreases toward the end in the sheet width direction as indicated by line C in FIG. This is because, as already described, the heat transfer coefficient at the end in the plate width direction increases.

Next, when only the masking plate is applied, as described above, most of the water flows 18 out of the water flows 17 from the center of the steel plate 1 in the width direction to the end portion in the width direction.
Is discharged over the opposite side of the upper masking plate 2 from the steel plate 1 at the end in the plate width direction as shown in FIG. Further, as shown in FIG. 9, a part of the water flow 21 of the water flow from the central portion in the width direction of the steel plate 1 toward the end portion in the width direction of the steel plate 1 is formed between the steel plate 1 and the tip of the inclined portion 2 a of the masking plate 2. The water enters the gap between the steel plate 1 and the masking plate 2 from the gap and is drained from the end (corner) in the width direction of the plate. Therefore, such running water 2
1 cools from the end in the width direction of the plate to the end. The flow velocity of the flowing water 21 flows to the end (corner) in the width direction of the plate without much lowering and is drained. Therefore, also in this case, the influence on the cooling capacity appears.

Therefore, the temperature distribution of the steel sheet at the end in the sheet width direction gradually decreases toward the end in the sheet width direction as indicated by line B in FIG. This is because the heat transfer coefficient at the end in the plate width direction is still increased by the flowing water 21.

Finally, in the case where a masking plate to which a running water deceleration member or a brush is attached is applied, as described above, the water flow 17 of the steel sheet 1 from the center in the sheet width direction to the end in the sheet width direction is used. Most of the water flow 18 is discharged beyond the side of the upper masking plate 2 opposite to the steel plate 1 at the end in the plate width direction as shown in FIG. Further, as shown in FIG. 8, a part of the water flow 21 of the water flow from the central portion in the width direction of the steel plate 1 toward the extreme end in the width direction of the steel plate 1 is in contact with the tip of the inclined portion 2 a of the steel plate 1 and the masking plate 2. When entering the gap between the steel plate 1 and the masking plate 2 from the gap, the hand going to the running water deceleration member or the brush 22 is stopped, and a part of the amount of water directed to the gap is combined with the water flow 18 to form the upper mask. The water flow 21, which has been discharged over the opposite side of the plate 2 from the steel plate 1 and has entered, is also an obstacle when the water flow 21 enters the flowing water reduction member or brush 22 and passes through the inside of the flowing water reduction member or brush. The flow velocity (power of the flowing water (water pressure)) is reduced while the path is hindered by the brush 22 and the vehicle passes through the vehicle while colliding.
During the passage between the two wire rods, it evaporates due to the heat of the steel sheet 1, and the excess of the running water 21 is sufficiently provided before the end in the width direction of the sheet, in particular, before the extreme end (corner), where overcooling is to be prevented. Can be eliminated.

Therefore, the temperature distribution of the steel sheet at the end in the sheet width direction can be kept uniform without decreasing the temperature toward the end in the sheet width direction as shown by line A in FIG. This is because even if the flowing water 21 enters the gap between the steel plate and the masking plate, it is evaporated, so that the heat transfer coefficient at the end in the plate width direction can be controlled.

As shown in FIG. 7, the masking plate having the running water deceleration member or brush is intermittently installed in the traveling direction of the steel plate, so that the heat transfer coefficient of the upper and lower surfaces of the end portion in the width direction of the steel plate. As shown in FIG. 7, the temperature deviation of the steel sheet in the width direction at the end and the center thereof is substantially eliminated as shown in FIG. Becomes possible.

In FIG. 7, when arranging the masking plate (both with and without the running water deceleration member or brush), the masking plate is intermittently moved in the direction of passing the steel plate (the traveling direction of the steel plate). It is arranged at the end of a steel plate. Further, since the form of the cooling water flow differs between the upper surface and the lower surface of the steel plate, it is possible to change the range and time for disposing the masking plate. did. According to FIG. 7, when the masking plate to which the brush of the present invention is attached is arranged, the temperature difference between the center and the end (measured at 10 mm from the end) at the end of cooling is 10 ° C.
It was possible to suppress to the extent.

When the conventional brush shown in FIG. 7 is not attached, the temperature difference between the center and the end (measured at 10 mm from the end) at the end of cooling is limited to about 30 ° C. there were. Further, when the masking plate was not provided, the temperature difference at the end of cooling between the center and the end (measured at 10 m from the end) was about 80 ° C.

Next, FIG. 6 is a schematic diagram showing a specific embodiment of the configuration of the main part of the present invention, which shows the positional relationship between a steel plate and a masking plate to which a flowing water moderating member or brush is attached. FIG. 2 shows a schematic perspective view. As shown in FIG. 6, the upper copy roll 19 is installed on the upper support arm 6 such that the axis of the upper copy roll 19 is perpendicular to the traveling direction of the steel sheet 1. Further, the upper masking plate 2 is set on the upper support arm 6.

By the copying roll 19, the upper masking plate 2 installed on the upper support arm 6 can be fixed in a positional relationship with the steel plate 1. This is because the copying roll 19 placed on the surface of the steel sheet 1 is smoothly rotated while tracing the steel sheet surface when the steel sheet is transported. Furthermore, even if there are undulations (irregularities) due to the thickness distribution of the scale on the surface of the steel sheet, for example, a spring or a suspension is provided on the upper support arm 6 so that the copying roll 19 can catch the surface of the steel sheet reliably. It is preferable to provide a vertical movement absorbing member capable of absorbing the vertical movement of the roll 19 in response to the change in the vertical movement. Thereby, the upper masking plate 2 and the copying roll 19 fixed to the upper support arm 6 can always keep a constant interval with respect to the vertical movement of the steel plate surface. Therefore, as shown in FIGS. 6 and 8, the upper masking plate 2 may be positioned above the steel plate 1 in the copying roll 19 portion. Further, as described above, by forming the masking plate 2 so as to be inclined so that the gap between the steel plate 1 and the steel sheet 1 is narrower on the central side in the sheet width direction than the copying roll 19, it is possible to prevent flowing water from entering the gap. It is desirable because it can be suppressed.

In the present invention, as shown in FIGS.
At least a part of the masking plate, preferably the steel plate and the masking, so as to suppress the flow velocity of the water flow flowing on the surface of the steel plate trying to enter the gap between the steel plate and the masking plate and evaporate by the heat of the steel plate. A portion on the side where water flows into the gap between the plates (for example, a portion of the masking plate on the central side in the width direction of the steel plate), and more preferably an inclined portion on the side where water flows into the gap between the steel plate and the masking plate ( For example, an inclined portion of the masking plate on the central side in the width direction of the steel plate))
And on the side of the masking plate facing (facing) the steel plate,
A running water deceleration member or a brush is attached so that its tip almost contacts the steel plate. As a result, the flow of the entering water flow is slowed down by the flowing water deceleration member or the resistor formed by the brush. Therefore, it is possible to extremely effectively and effectively prevent the infiltration water from reaching the outermost end in the width direction of the steel sheet without decelerating and being supercooled without being discharged. be able to. In addition, since it becomes possible to control the flow of water passing through the corners of the end portions of the steel sheet and to uniformly cool the entire steel sheet, the yield of products is significantly improved as shown in FIG. be able to. Furthermore, since the apparatus configuration is extremely simple, there is almost no failure or problem that may occur when a complicated drive system is used, and stable operation can be performed, so that a long-term product yield is excellent. In addition, since the running water deceleration member or brush can be used as a durable consumer for a long period of time and can be easily replaced in a short time, it is economically necessary to constantly supply a large amount of high-temperature air at high pressure. It is extremely useful and economically advantageous without any fatal drawback in terms of surface.

Further, in the present invention, as shown in FIGS. 6 and 8, a length necessary for preventing supercooling is secured from the end (corner) of the steel sheet, and a copying roll is installed in this portion. A tip inclined portion to which the running water deceleration member or the brush is attached may be provided first, or a length necessary to prevent supercooling from the extreme end (corner) of the steel plate to the tip inclined portion to which the running water deceleration member or the brush is attached. You may secure it. This is caused by the distance between the steel plate and the tip of the masking plate (interval of the gap), the number, thickness, mounting density (density) of the wires (such as wires) that constitute the running water deceleration member or brush at the tip. This is because the flow velocity and the flow rate are different, so that the inflow area (flowing water cooling area) until the water flow evaporates is also different.

Further, according to the present invention, the flowing water moderating member or brush is attached to substantially the entire masking plate so that the flowing water moderating member or brush plays a role of keeping the masking plate and the steel plate constant. Since it is possible, it can be said that the copying roll does not necessarily have to be essential (in this case, the supporting arm only needs to support the masking plate). In such a case, in the upper masking plate, the running water is flowing on the upper part,
In order to hold the masking plates including such running water, the holding (load) strength required to support them is required for the running water moderating member or brush. It is desirable to use a wire brush or the like.

The running water speed reducing member or brush of the present invention is not limited to its name, but may be any material capable of reducing the flow speed of running water while passing between the running water speed reducing member and the brush. For example, each one is composed of only a substantially straight wire, such as a single filament such as a wire or a plurality of filaments twisted together such as a wire brush. It is not particularly limited as long as the above-mentioned effects can be obtained, for example, it may be formed in a mesh shape so as to be connected to the surface, or may be formed in a lattice shape so as to be connected in a three-dimensional manner. Not something.

Further, as for the installation of the running water deceleration member or the brush on the masking plate, a plurality of wires may be provided at each installation point of the masking plate as in a normal wire brush, or each of the installation members on the masking plate side may be provided. There is no particular limitation, for example, one wire may be provided for each point. In the case of a mesh-like or grid-like shape, wires are connected to connect the respective installation points of the masking plate. There is no particular limitation, for example, it may be wound around.

The number of wires and the thickness of the wires constituting the flow speed reducing member or the brush on the masking plate are not limited as long as the effects of the present invention can be sufficiently exhibited. is not. Also, regarding the installation density of the wires constituting the brush on the masking plate,
Although it cannot be unambiguously defined because it differs depending on the distance between the steel plate and the masking plate, etc., in consideration of these factors, the heat between the steel plate and the masking plate causes What is necessary is that it has a density that can be an obstacle that can slow down the flow velocity of the flowing water so that the flowing water that has entered the gap can be evaporated.

Further, the length of the wire constituting the flowing water moderating member or the brush may be such that it is substantially in contact with the surface of the steel plate. That is, the effects of the present invention can be achieved even if they are completely in contact with each other or are separated to some extent. Further, a wire constituting the running water deceleration member or the brush may be attached to the masking plate so as to be perpendicular (perpendicular) to the surface of the steel plate, or may be inclined in the traveling direction of the steel plate, It may be attached not at a right angle but at an angle, for example, inclined from the center toward the end. By doing so, even if there is a thickness distribution of the scale on the surface of the steel sheet, the contact resistance to the steel sheet can be reduced, and the surface of the steel sheet can be hardly scratched.

Further, the tip of the wire constituting the flowing water moderating member or the brush may be straight, but, for example, when a high hardness wire is used, the tip of the wire does not damage the steel plate surface. Thus, it is preferable to be processed into a spherical shape or to have a bent shape like a hook (needle).

Further, the material of the wire constituting the flowing water moderating member or the brush is resistant to high heat of the steel sheet, resists mechanical stress due to contact with the steel sheet surface, and is resistant to high heat from the steel sheet and thermal shock due to cooling water. It is preferable to use a metal (including an alloy) such as an iron-based or aluminum-based metal. In particular, it is a material that is excellent in heat resistance, durability, workability, mechanical strength, etc., and has a hardness lower than the surface hardness of the steel sheet and is not easily scratched. Alloys).

As described above, according to the apparatus and method for cooling a steel sheet of the present invention, it is possible to control the water flow that causes a deviation in the cooling rate at the end of the steel sheet in the width direction. This prevents the temperature of the part from lowering, flattens the temperature distribution of the steel sheet, and provides a uniform cooling action.

[0076]

The present invention will now be described more specifically with reference to examples. Example 1 After finishing rolling (steel plate temperature 850 to 950 ° C.), passing through a straightening machine and passing through a thermometer, and then performing accelerated cooling, the apparatus shown in FIG. 1 (the peripheral structure of the masking plate is shown in FIGS. 6 and 8). Of a steel sheet having a width of 1.5 m and a thickness of 12 mm was cooled with water from a steel sheet surface temperature of 800 ° C. to 550 ° C.

At this time, from the initial stage of cooling, the copying roll is installed on the steel sheet so that the roll axis is perpendicular to the traveling direction of the steel sheet, and the masking plate portion other than the brush mounting portion is installed on the copying roll. In addition to these masking plates and copying rolls, as shown in FIG. 6 (perspective view) and FIGS. 2 and 8 (cross-sectional views), upper and lower masking support arms for supporting these, in addition to FIG. A slider driven by a stepping motor was connected as a drive device for the upper and lower surfaces that enables the masking support arms on the lower surface to be movable in the plate width direction independently of each other. When a masking plate is installed using a masking device having such a device configuration,
The length of the steel plate in the width direction from the plate edge (corner) to the tip of the masking plate (including the brush portion) was adjusted to be 200 mm. More specifically, the upper and lower support arms 6, 11, which are connected to the sliders 13, 16, the masking plates 2, 3, and the copying roll (not shown) on the upper and lower masking moving bases 7, 10 shown in FIG.
Of these, the position at which the tip portions of the masking plates 2 and 3 are flush with the corner portions (edge portions) of the steel plate is used as the home position, and the number of pulses applied to the stepping motor is adjusted to adjust the slider (that is, the slider). , The amount of advance (or the amount of retreat) of the steel plate toward the center in the width direction of the steel plate is controlled from the end (corner) of the steel plate in the width direction of the steel plate. (Including the brush portion) can be adjusted to be 200 mm.

As shown in FIGS. 6 (perspective view) and FIGS. 2 and 8 (cross-sectional views), such a masking plate has an edge in the width direction of the steel plate so that the distance between the steel plate and the masking plate is reduced after the above position adjustment. One having a tip inclined portion bent at a position 100 mm from a portion (corner) was used. In this embodiment, a copying roller having a diameter of 50 mm and a masking plate having an inclination angle of about 25 degrees are used so that the distance between the tip of the inclined portion and the surface of the steel plate is opened by 4 mm for both the upper and lower masking plates. did. Further, the masking plate was provided with a wire brush whose length was adjusted so that the tip thereof was in contact with the steel plate on the side of the inclined surface of the masking plate facing the steel plate. As the wire brushes, wire brushes were used, which were uniformly arranged on the inclined portion of each masking plate at intervals of 1 mm in both the plate width direction and the plate length direction. The wire used was a straight iron-made stranded wire.

As a result, a flat temperature distribution could be obtained in the width direction of the steel sheet as indicated by line A in FIG. From the above results, it is clear that the method of the present invention can prevent overcooling of the steel sheet in the width direction at the end, and that the object of uniform cooling in the width direction of the steel sheet is achieved. In addition, as shown in FIG. 7, when a masking plate to which the brush of the first embodiment is attached is arranged, the temperature difference between the center and the end (measured at 10 mm from the end) of the steel plate at the end of cooling is determined. It can be seen that it can be suppressed within 10 ° C.

Comparative Example 1 The procedure of Example 1 was repeated, except that the wire brush was not used, and the width was 1.5 m and the thickness was 12 mm.
Was cooled with water from a steel sheet surface temperature of 800 ° C. to 550 ° C.

As a result, a flat temperature distribution could be obtained at the center of the steel sheet in the width direction, as shown by the line B in FIG. 4, but at the end in the width direction, the closer to the corner, the lower the temperature. , And a temperature distribution as flat as line A shown in FIG. 4 could not be obtained. From the above results, it is clear that even in the comparatively improved conventional method, the overcooling of the steel sheet in the width direction end has not been sufficiently prevented, and uniform cooling in the sheet width direction of the steel sheet has not been achieved. It turns out that the purpose has not been completely achieved. As shown in FIG. 7, when a conventional masking plate without a brush is arranged, the temperature difference between the center and the end (measured at 10 mm from the end) of the steel plate at the end of cooling is 30 ° C.
It can be seen that suppression to the extent is the limit.

Comparative Example 2 The procedure of Example 1 was repeated, except that the masking device was not used.
Was cooled with water from a steel sheet surface temperature of 800 ° C. to 550 ° C.

As a result, a flat temperature distribution could be obtained at the center of the steel sheet in the sheet width direction as indicated by the line C in FIG. 4, but at the end in the sheet width direction, the closer to the corner, the lower the temperature. Was remarkably observed, and a flat temperature distribution could not be obtained as in Comparative Example 1. From the above results,
It is clear that the conventional method, which has not been improved, does not prevent overcooling of the steel sheet in the width direction at the end, and the cooling rate distribution in the width direction of the cold steel sheet can be obtained, and the uniformity of the shape and material can be obtained. Is not achieved. Further, as shown in FIG. 7, when a conventional masking device is not used, running water causes overcooling of the end portion in the width direction of the steel plate, so that the central portion and the end portion of the steel plate (10 mm from the end portion). It can be seen that the temperature difference at the end of cooling in (Measurement) is about 80 ° C.

Next, the steel sheet obtained in Example 1 and the steel sheet obtained in Comparative Example 1 were subjected to shape quality inspection. The results obtained are shown in FIG. As is apparent from FIG. 5, a slight difference in the temperature distribution in the width direction of the steel sheet during cooling caused a clear difference in the shape grade rejection rate of the product. For this reason, it is extremely important to make efforts to further improve the uniformity of the temperature in the width direction of the steel sheet by the effect of supercooling at the end in the width direction of the steel sheet during cooling. Significant superiority in the flatness improvement of the steel sheet shape accompanying it is recognized,
It was found that it could greatly contribute to the uniformity of the material (quality) of the steel sheet.

[0085]

As described above, according to the present invention,
Subsequent to hot rolling, in a steel sheet cooling apparatus and a steel sheet cooling method for cooling the steel sheet with a jet using water as a cooling medium, the temperature distribution in the width direction of the steel sheet can be uniformly cooled. Therefore, uniform mechanical properties and shapes can be obtained, and a great contribution can be expected in the industrial field.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view in the width direction of a steel plate for explaining an apparatus of the present invention.

FIG. 2 is a schematic cross-sectional view taken along the width direction of the steel sheet, schematically illustrating the flow of cooling water at the width direction ends of the upper and lower surfaces of the steel sheet by the steel sheet cooling device of the present invention.

FIG. 3 is a schematic cross-sectional view taken along the width direction of the steel sheet, schematically illustrating the flow of cooling water at the upper and lower surface width ends of the steel sheet by the conventional steel sheet cooling device.

FIG. 4 is a graph illustrating a distribution of a steel sheet temperature in a steel sheet width direction by the present invention and a conventional steel sheet cooling device.

FIG. 5 is a graph showing a shape grade rejection rate of a product obtained by the present invention and a conventional steel plate cooling device.

FIG. 6 is a perspective view schematically illustrating details of a steel plate contact portion of the apparatus of the present invention.

FIG. 7 is a temperature transition diagram at the time of cooling an end portion and a central portion of a steel plate by the present invention and a conventional steel plate cooling device.

FIG. 8 is a schematic cross-sectional view of a steel plate contact section of the apparatus of the present invention, schematically illustrating the details of the steel plate contact portion along the width direction of the steel plate.

FIG. 9 is a schematic cross-sectional view of a steel plate contact portion of a conventional apparatus, schematically illustrating the details of the steel plate contact portion along the width direction of the steel plate.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Steel plate, 2 ... Upper masking plate, 2a ... Tip inclined part of upper masking plate, 3 ... Lower masking plate, 4 ... Upper surface cooling water header, 5
... top surface cooling nozzle, 6 ... upper support arm,
Reference numeral 7: Upper masking moving base, 8: Lower surface cooling water header, 9: Lower surface cooling nozzle, 10: Lower masking moving base, 11: Lower supporting arm, 12
... upper surface water jet, 13 ... upper masking plate position adjusting mechanism, 14 ... water flow from the center in the plate width direction of the steel plate to the end in the plate width direction, 15 ... lower surface water jet,
16 ... lower masking plate position adjustment mechanism, 17 ...
Water flow from the center of the steel plate in the width direction to the end in the width direction of the steel plate, 18: water flow discharged from the end of the steel plate, 19: copying roll, 20: end of the steel plate in the width direction of the steel plate, 21: width of the steel plate A water flow from the center in the direction to the end in the plate width direction;

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[Procedure amendment]

[Submission date] March 19, 2001 (2001.3.1.
9)

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] Fig. 1

[Correction method] Change

[Correction contents]

FIG.

[Procedure amendment 2]

[Document name to be amended] Drawing

[Correction target item name] Figure 2

[Correction method] Change

[Correction contents]

FIG. 2

[Procedure amendment 3]

[Document name to be amended] Drawing

[Correction target item name] Figure 3

[Correction method] Change

[Correction contents]

FIG. 3

[Procedure amendment 4]

[Document name to be amended] Drawing

[Correction target item name] Fig. 6

[Correction method] Change

[Correction contents]

FIG. 6

Claims (11)

[Claims] 1. A cooling apparatus for a steel sheet, which cools the steel sheet by a jet using water as a cooling medium, following the hot rolling, wherein an interval between the steel sheet and the steel sheet is reduced in order to mask an upper surface and a lower surface of an end portion in a width direction of the steel sheet. An upper and lower masking plate that is installed separately, and a flowing water moderating member that is attached to a plate surface of the upper and lower masking plate that faces the steel plate and that reduces a flow velocity of flowing water that enters a gap between the steel plate and the masking plate. A cooling device for a steel sheet, comprising a masking device having: 2. A steel sheet cooling apparatus for cooling a steel sheet by a jet using water as a cooling medium subsequent to hot rolling, wherein a gap between the steel sheet and the steel sheet is set so as to mask an upper surface and a lower surface of an end portion in a width direction of the steel sheet. A cooling device for a steel sheet, comprising: a masking device having an upper and lower masking plate which is separately installed and has a brush attached to a plate surface side facing the steel plate. 3. The cooling device for a steel sheet, wherein the upper surface of the steel sheet is disposed above the steel sheet at an interval to mask the upper end of the steel sheet in the width direction, and the upper surface of the steel sheet is opposed to the steel sheet. An upper masking plate to which a speed reduction member or an upper brush is attached; an upper copying roll that supports the upper masking plate and smoothly follows the steel plate; and an upper support arm that supports the upper masking plate and the upper copying roll. An upper drive device that allows the upper support arm to move in the width direction and / or the traveling direction of the steel plate, and that is spaced apart from the steel plate in order to mask the lower surface of the steel plate in the width direction. A lower masking plate installed below the lower surface and having a lower surface water flow reduction member or a lower brush attached to a plate surface side facing the steel plate, and supporting the lower masking plate to form a steel plate. A lower copying roll for supporting the lower masking plate and the lower copying roll, and a lower support arm supporting the lower masking plate and the lower copying roll independently of the upper support arm in a width direction and / or a traveling direction of the steel sheet. 3. The cooling device for a steel sheet according to claim 1, further comprising a masking device having a lower drive device that is movable. 4. The masking plate on the side where water flows into the gap between the steel plate and the masking plate has an inclined portion inclined so as to narrow the gap between the steel plate and the masking plate.
The cooling device for a steel sheet according to any one of claims 1 to 3. 5. The method according to claim 1, wherein a central portion of the masking plate in a width direction of the steel plate has an inclined portion inclined so as to narrow a gap with the steel plate. Steel plate cooling device. 6. The apparatus according to claim 4, wherein the running water deceleration member or the brush is attached to at least an inclined portion of the masking plate and a plate surface facing the steel plate.
Or the cooling device for a steel sheet according to 5. 7. The cooling device for a steel sheet according to claim 1, wherein a tip portion of the running water moderating member or the brush is substantially in contact with a surface of the steel sheet. 8. A jet means for cooling a steel sheet with a jet using water as a cooling medium is provided with an injection nozzle arranged at a predetermined interval in a width direction of the steel sheet and / or in a width direction of the steel sheet. The cooling device for a steel sheet according to any one of claims 1 to 7, wherein the slit nozzle has an enlarged diameter. 9. The upper and lower masking plate is a portion other than a plurality of pairs of transport rolls provided at appropriate intervals above and below the steel plate, and is substantially directly below an upper surface cooling nozzle. The steel plate cooling device according to any one of claims 1 to 8, wherein the steel plate cooling device is arranged so as to mask an end portion in a width direction of the steel plate substantially immediately below the lower surface cooling nozzle. 10. A masking plate for masking an upper surface and a lower surface of an end portion in a width direction of a steel sheet when cooling the steel sheet with a jet using water as a cooling medium subsequent to the hot rolling, and Prevent the water jet from directly hitting the edge by the masking plate.Most of the water flowing when the cooling water colliding with the steel sheet passes through the edge from the center in the width direction of the plate and is discharged from the extreme end is the masking plate. Flow on the plate surface side opposite to the plate surface side facing the steel plate, and further, a flowing water moderating member is attached to the plate surface side of the masking plate facing the steel plate, and the water flow speed reduction member enters the gap between the steel plate and the masking plate. A method for cooling a steel sheet, comprising slowing down the flow velocity of flowing water and evaporating the flowing water. 11. After the hot rolling, when cooling the steel sheet with a jet using water as a cooling medium, the cooling apparatus for the steel sheet according to any one of claims 1 to 9 is used. Steel sheet cooling method.