JP3644140B2 - High temperature metal plate cooling system - Google Patents

Description

【００２２】
【発明の効果】
搬送速度を１０００ｍｐｍ、巻取り温度の目標を５００℃として、５０ｋｇｆ／ｍｍ² の強度をもつ板厚３．２ｍｍの鋼板を製造する場合を例にとり、鋼板の長手方向の巻取り温度及び材質のばらつきを比較すると、従来のように滞留水を排除する排出口がない場合、巻取り温度は全長について、５００±４５℃の範囲でばらついており、得られた材質（強度）は５０±４．５ｋｇｆ／ｍｍ² の範囲内でばらついていた。
【００２３】
これに対し、本発明の高圧水噴射ノズルを備え、滞留水を排除するの排出口を設けた場合、巻取り温度は全長について、５００±２５℃の範囲内におさめることができ、得られた材質（強度）は５０±２．５ｋｇｆ／ｍｍ² の範囲内に収まり、より品質の高い製品を製造することが可能となった。
【図面の簡単な説明】
【図１】実施例の構成を示す斜視図である。
【図２】鋼板の冷却プロセスの模式系統図である。
【図３】噴射高圧水のベクトルの水平面への投影を示す説明図である。
【図４】噴射高圧水のベクトルの垂直面への投影を示す説明図である。
【符号の説明】
１ 高温金属板（鋼板）
２ 仕上圧延機
３ 水冷装置
４ 巻取り機
５ 電磁弁
６ オーバーヘッドタンク
７ 演算装置
１０ 噴射装置
１０ａ，１０ｂ，１０ｃ スプレーノズル
１１ ポンプ
１２ 配管
１３ 給水槽
１５ 電磁弁
２０ テーブルローラ
２１ 搬送方向
２２ ガイド
２３ 案内板
２４，２５ 矢印
２６ 滞留冷却水
２７ 排出口
３１、３３ 搬送方向
３２ 水平面への投影ベクトル
３４ 鉛直面
３５ 水平方向
３６ 鉛直面への投影ベクトル[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method and an apparatus for cooling a high-temperature metal plate.
[0002]
[Prior art]
In order to obtain the target material, it is very important to set the temperature as intended in the manufacturing process of the high-temperature metal plate. For example, the temperature at the time of winding a hot-rolled metal plate is an important factor that determines mechanical properties such as the strength of the metal plate. Therefore, in order to make the material of the product uniform and produce a high-quality product, it is necessary to control the coiling temperature to be constant according to the target. In general, the coiling temperature is controlled by adjusting the length of the water cooling zone and the amount of cooling water supplied to the metal plate in the water cooling zone in accordance with the product dimensions and transport speed in the cooling device that passes after finishing rolling. ing.
[0003]
[Problems to be solved by the invention]
When the high-temperature metal plate passes through the water-cooled cooling device, the temperature drop of the metal plate can be either water-cooled or air-cooled, but usually it is mostly water-cooled. Must not be supplied to the hot metal plate. However, there are several problems with the current technology.
[0004]
The cooling water supplied from below to the high-temperature metal plate in the water-cooling zone will naturally drop at that position, so it will not participate in the cooling of the high-temperature metal plate after passing through the water-cooling zone. Since the cooling water supplied from above to the plate is transported together with the high temperature metal plate while staying on the high temperature metal plate, the cooling is continued after passing through the water cooling zone.
[0005]
If cooling water stays on the upper surface of the high-temperature metal plate even after passing through the water-cooling zone, the temperature drop at that time is much larger than in the case of air cooling that should be performed, so the coiling temperature becomes too low and accurate temperature control is possible. I can't. In addition, when only the upper surface of the high-temperature metal plate is cooled, the thermal shrinkage on the upper surface becomes larger than that on the lower surface, so that depending on the thickness of the product, the high-temperature metal plate is warped upward and installed on the cooling device outlet side. It may be difficult to measure the width when passing through the width measuring device.
[0006]
After passing through the water cooling zone, it is desirable to remove the cooling water staying on the upper surface of the high temperature metal plate as soon as possible. Conventionally, stagnant water has been eliminated by injecting high-pressure water onto the upper surface of the high-temperature metal plate from an injection device installed on the side of the transfer line, downstream of the water cooling zone in the transfer direction.
On the other hand, in recent years, in order to improve the productivity of the high-temperature metal plate, the rolling speed, that is, the conveying speed in the cooling device tends to be set higher. The higher the transport speed, the shorter the time during which the high-pressure water is sprayed onto each part of the high-temperature metal plate, so that the stagnant water is less likely to be removed. In addition, in order to maintain the stability of the plate even if the conveyance speed is increased, the equipment may be modified such as making the roller pitch of the conveyance table smaller than in the past. The staying water removed from the upper surface of the high temperature metal plate is less likely to fall between the rollers, hits the side wall of the transfer table, rebounds, and rests on the upper surface of the high temperature metal plate. Therefore, when the conveyance speed increases, it becomes difficult to eliminate the cooling water staying on the upper surface of the high-temperature metal plate after passing through the water cooling zone, and the controllability of the winding temperature is deteriorated.
[0007]
Similarly, when the high-temperature metal plate to be conveyed is wide and the distance between the plate end and the side wall of the conveyance line is large, the water that hits and rebounds on the side wall of the conveyance table is again placed on the upper surface of the high-temperature metal plate. The problem that occurs easily.
The present invention solves the problem that the cooling water stays on the upper surface of the metal plate even after passing through the water cooling zone as described above in the cooling device for the high temperature metal plate, and can cool the high temperature metal plate with high accuracy. And it aims at providing a cooling device.
[0008]
[Means for Solving the Problems]
The present invention has been developed to solve the above-described problems. The technical means includes a cooling water supply means for supplying cooling water to the upper surface of the high temperature metal plate, and a cooling water supply means for cooling the high temperature metal plate being transported. Water is sprayed onto the metal plate in a direction that is arranged immediately after the means and forms an angle of 90 ° or more with respect to the conveying direction of the high-temperature metal plate in the horizontal plane and 0 ° or more with respect to the horizontal line in the vertical plane. A plurality of injection devices, each of which includes a plurality of discharge devices that change the injection angle little by little; and a discharge means that discharges cooling water and injection water provided by cutting out side walls on an extension line in the injection direction on the side of the metal plate conveyance line. There is provided a cooling device for a high-temperature metal plate characterized by comprising a plurality of nozzles .
[0009]
Before SL injector is in turn flock effect accumulated water if a plurality of nozzles with different ejection angle little by little, also, the discharge means outlet soon as installing the guide plate on the upstream side steel sheet discharge port Troubles that rush into can be prevented.
[0010]
In the present invention, immediately after the supply of the upper surface cooling water is finished, the cooling water staying on the upper surface of the metal plate is immediately drained and removed. This makes it possible to significantly improve the accuracy of cooling control as compared with the conventional case. The water is ejected from the upper side of the metal plate toward the upstream side in the transport direction from one side obliquely upward of the metal plate transport line. Then, drainage is immediately removed to the other side of the metal plate conveyance line.
[0011]
The apparatus of the present invention is disposed immediately after the cooling water supply means and forms an angle of 90 ° or more with respect to the conveying direction of the high temperature metal in the horizontal plane and an angle of 0 ° or more downward with respect to the horizontal line in the vertical plane. An injection device for injecting water is provided. 90 ° or more with respect to the conveying direction of the high-temperature metal plate in the horizontal plane is a direction at least perpendicular to the conveying direction or toward the upstream side. As a result, it is possible to prevent the staying water on the metal plate to be conveyed from being conveyed and to discharge it to the side of the metal plate. Further, since the high-pressure water is jetted onto the metal plate in a direction that forms an angle of 0 ° or more downward with respect to the horizontal line in the vertical plane, it is possible to eliminate the accumulated water on the upper surface of the metal plate. And by providing the discharge means which discharges the cooling water and the jet water on the extension line in the jet direction on the side of the metal plate conveying line, the jet water entrains the retained water on the upper surface of the metal plate and flows into the discharge port as it is. The stagnant water on the upper surface of the plate can be completely drained.
[0012]
As described above, since the injection direction of the high-pressure water from the side is the horizontal direction or obliquely downward, the water staying on the upper surface of the metal plate can be pushed and removed. Moreover, since it injects toward a substantially orthogonal direction or upstream side with respect to the conveyance direction of a high temperature metal plate on a horizontal surface, stagnant water can be discharged | emitted to the opposite side to an injection apparatus.
Setting to determine the number of valves to be opened at multiple locations in the longitudinal direction of a high-temperature metal sheet according to conditions such as sheet thickness, cooling start temperature (usually the temperature immediately after finishing rolling), target winding temperature, and conveyance speed pattern Perform the calculation. The heat transfer coefficient estimated by this setting calculation is usually several hundred W / m ² ° C in the zone where the cooling water is supplied (hereinafter referred to as the water cooling zone), and the zone where the cooling water is not supplied (hereinafter referred to as the air cooling zone). It is several tens of W / m ² ° C. Although the cooling capacity of the air cooling zone is smaller than that of the water cooling zone, if the cooling water supplied upstream in the transport direction stays on the high-temperature metal plate and is transferred as it is, the temperature drop during this period is estimated as air cooling. It will be bigger than the one. Although there is a concept that the heat transfer coefficient in the state where there is stagnant water may be obtained in advance, whether or not the cooling water stays on the high temperature metal plate or how long it stays The reproducibility is very poor, depending on the width and shape of the plate and the conveyance speed. Therefore, in order to improve the accuracy of the coiling temperature, the accumulated water on the hot metal plate is completely removed immediately after passing the water cooling zone, and the cooling capacity as estimated by the setting calculation at each position in the cooling device. It is necessary to get For this purpose, means for injecting water and eliminating stagnant water is used. As described above, since the length of the water cooling zone varies depending on the plate thickness, the cooling start temperature, the target winding temperature, the conveyance speed pattern, and the like, it is desirable to install a plurality of sprays at a certain interval in the cooling device.
[0013]
The water is sprayed on the downstream side in the metal plate conveyance direction from the position where the water cooling zone ends, and the spray at the position closest thereto is sprayed. The number of sprays to be sprayed may be one, but it may be two or more when it is desired to completely remove the accumulated water on the metal plate. The jet water does not need to be at high pressure, and the jet amount may be increased in order to push the accumulated water to the opposite side even at low pressure.
[0014]
When the apparatus of the present invention is used, the uneven cooling generated by the influence of the cooling water staying on the upper surface of the metal plate after passing through the water cooling zone is eliminated. As a result, the temperature controllability such as the winding temperature of the high-temperature metal plate is dramatically improved, and there is no unevenness in the properties such as the mechanical strength of the material, making it possible to manufacture a high-quality metal plate product.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
As an Example, the case where the apparatus of this invention is installed in the water-cooling apparatus after the finish rolling about the hot rolled thin steel plate which is a high temperature metal plate is demonstrated.
FIG. 2 is a diagram schematically showing a cooling process of the high-temperature metal sheet on the exit side of the finishing mill. In FIG. 2, a hot-rolled steel sheet (high-temperature metal sheet) 1 is rolled by a finish rolling mill 2, and then passes through a cooling device in which water cooling devices 3 composed of a plurality of cooling header groups are arranged on both the upper and lower sides of the steel plate, It is wound up by a winder 4. In the water cooling device 3 of FIG. 2, a plurality of headers configured by arranging nozzles for supplying cooling water in the steel plate width direction are arranged in parallel at intervals of several tens of cm in the steel plate conveyance direction. The cooling water supply is started and stopped by opening and closing a valve at the base of the header. By the way, the cooling device for hot-rolled steel sheets has a very large number of headers, so if a valve is installed at the base of each header, the equipment cost becomes very high. Except for the zone, a plurality of headers are grouped to control the opening and closing of one valve. During the conveyance of the hot-rolled steel sheet, in the water cooling device 3, the water supply from the overhead tank 6 is controlled to be opened and closed by one or a plurality of electromagnetic valves 5. An injection device 10 is installed on the side of the transfer line between the water cooling devices, and the injection water taken from the water supply tank 13 and pressurized by the pump 11 is supplied through the pipe 12. Injection from the spray nozzle is performed by opening / closing control of the electromagnetic valve 15. The opening / closing command for the solenoid valves 5 and 15 is output by the arithmetic unit 7. Although FIG. 2 shows the case where there are three sprays, the present invention is not limited to this.
[0016]
FIG. 1 is a diagram showing the configuration of an embodiment of the apparatus of the present invention. In FIG. 1, a large number of steel plates 1 are conveyed on table rollers 20 arranged in parallel. The spray device 10 is provided with three spray nozzles 10a, 10b, and 10c. Although FIG. 1 shows three spray nozzles in which the spray angle is changed little by little at the same position, there is an effect of pushing the accumulated water toward the side sequentially from the front. In addition, installing a plurality of spray nozzles at the same position is also effective when manufacturing steel plates having different widths. As shown in FIGS. 3 and 4 and Table 1, each nozzle has an angle α of 100 to 110 ° with respect to the conveying direction 31 of the steel plate on the horizontal plane, and an angle β made downward with respect to the horizontal plane of 30 to 45 °. It is installed at an angle. High-pressure water is jetted from the nozzles 10a, 10b, and 10c only when the upstream side in the steel sheet conveying direction is the water cooling zone and the downstream side is the air cooling zone from the installation position of the jetting device 10. The solid arrow 24 in FIG. 1 represents the direction of high-pressure water injection, and the dotted arrow 25 represents the direction in which the retained cooling water 26 that flows from the upstream side after the high-pressure water hits the upper surface of the steel sheet is drawn in. ing. 3 and 4 are explanatory diagrams of vectors 32 and 36 obtained by projecting the injection direction of high-pressure water on a horizontal plane and a vertical plane, respectively. As shown in FIG. 3, the injection angle of the high-pressure water is set to α = 90 ° or more with respect to the steel plate conveyance direction 31 on the horizontal plane, and further downward in the horizontal direction 35 in the vertical plane 34 as shown in FIG. Β = 0 ° or more. The high pressure water surely hit the upper surface of the steel plate 1, and the subsequent flow was able to dam the stagnant cooling water 26 conveyed from the upstream, and it was entangled and pushed sideways. Since the injection angles of the three nozzles 10a, 10b, and 1c were changed little by little as shown in Table 1, the staying cooling water was pushed sideways from the front as shown in FIG. It was.
[0017]
Since the water removed from the upper surface of the steel sheet flows into the discharge port 27 and is removed from the drainage, it is no longer possible that the high-pressure jet water bounces back on the guide and reappears on the upper surface of the steel sheet. The discharge port 27 is provided by partially cutting away the guide 22 of the transport line on an extension line in the spray direction. Conventionally, there has been a risk that the steel plate snakes and jumps out of the conveying line when passing through the tip, so that the guide is not provided with a notch. In the apparatus of the present invention, since the guide plate 23 having an angle of 15 ° with the steel plate conveyance direction is installed immediately upstream of the discharge port 27, even if the steel plate meanders, the tip of the steel plate hits the guide plate 23 and the traveling direction is corrected. The steel plate 1 does not rush into the discharge port 27 and cause trouble.
[0018]
In the embodiment of the present invention, the spray device 10 in which three spray nozzles 10a, 10b, and 10c for spraying high-pressure water are arranged is shown, but the number of nozzles is not limited. In the present invention, it is sufficient if the discharge port 27 is provided on an extension line in the spraying direction of the spray, and a case where the guide plate 23 is provided in order not to impair the end plate passing property even if the discharge port 27 is installed is shown. However, the guide plate 23 is not always necessary. For example, a guide may be provided at the discharge port 27, and this portion may be an openable type, which may be closed when passing through the tip and opened at other times.
[0019]
Although the spray pressure of the embodiment of the present invention was 10 kgf / cm ² , what is required is not the pressure but the momentum of water applied from the side to push the stagnant water to the opposite side. You can do more.
As described above, according to the present invention, the cooling water staying on the upper surface of the steel plate during the water cooling can be quickly eliminated after passing through the cooling zone, so that the controllability of the coiling temperature can be dramatically improved. I was able to. As a result, properties such as mechanical strength of the product are not uneven, and a high-quality product can be manufactured.
[0020]
In the above examples, the case of the water cooling apparatus after finish rolling of the hot-rolled thin steel sheet has been shown, but the present invention may be any apparatus that cools the high-temperature metal plate being transported, and the cooling apparatus for the hot-rolled thin steel sheet It is not limited. For example, an apparatus similar to that of the present embodiment may be installed in a water cooling apparatus after rolling a hot-rolled thick steel sheet, and if a cooling apparatus is necessary in the manufacturing process of other metal plates such as aluminum, Even other processes that are not processes after hot rolling can be used.
[0021]
[Table 1]

[0022]
【The invention's effect】
Variations in the coiling temperature and material in the longitudinal direction of the steel sheet, taking as an example the case of manufacturing a steel sheet with a thickness of 3.2 mm having a strength of 50 kgf / mm ^{2 with} a conveying speed of 1000 mpm and a coiling temperature target of 500 ° C. When there is no outlet for removing stagnant water as in the prior art, the coiling temperature varies in the range of 500 ± 45 ° C over the entire length, and the obtained material (strength) is 50 ± 4.5 kgf. / Mm ² .
[0023]
On the other hand, when the high-pressure water jet nozzle of the present invention is provided and a discharge port for removing stagnant water is provided, the coiling temperature can be kept within a range of 500 ± 25 ° C. over the entire length. The material (strength) was within the range of 50 ± 2.5 kgf / mm ² , making it possible to produce a higher quality product.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a configuration of an embodiment.
FIG. 2 is a schematic system diagram of a steel plate cooling process.
FIG. 3 is an explanatory diagram showing projection of a vector of jetted high-pressure water onto a horizontal plane.
FIG. 4 is an explanatory diagram showing projection of a vector of jetted high-pressure water onto a vertical plane.
[Explanation of symbols]
1 High-temperature metal plate (steel plate)
2 Finishing rolling mill 3 Water cooling device 4 Winding machine 5 Solenoid valve 6 Overhead tank 7 Arithmetic device 10 Injection device 10a, 10b, 10c Spray nozzle 11 Pump 12 Pipe 13 Water supply tank 15 Electromagnetic valve 20 Table roller 21 Transport direction 22 Guide 23 Guide Plates 24, 25 Arrow 26 Stagnant cooling water 27 Discharge port 31, 33 Transport direction 32 Projection vector 34 on horizontal plane Vertical plane 35 Horizontal direction 36 Projection vector on vertical plane

Claims (2)

In an apparatus for cooling a high-temperature metal plate being transported, a cooling water supply means for supplying cooling water to the upper surface of the high-temperature metal plate, and 90 ° or more with respect to the transport direction of the high-temperature metal plate in a horizontal plane disposed immediately after the means An injection device for injecting water onto the metal plate in a direction that makes an angle of 0 ° or more downward with respect to the horizontal line in the vertical plane, and a side wall on the extension line in the injection direction on the side of the metal plate conveyance line A cooling device for a high-temperature metal plate, comprising: a provided cooling water and a discharging means for discharging the jet water, wherein the spray device comprises a plurality of nozzles whose injection angles are changed little by little. 2. The cooling apparatus for a high-temperature metal plate according to claim 1, wherein the discharge means is provided with a guide plate immediately upstream of the discharge port.

Images