JPH02290923A - Method for cooling steel plate - Google Patents
Method for cooling steel plateInfo
- Publication number
- JPH02290923A JPH02290923A JP10728289A JP10728289A JPH02290923A JP H02290923 A JPH02290923 A JP H02290923A JP 10728289 A JP10728289 A JP 10728289A JP 10728289 A JP10728289 A JP 10728289A JP H02290923 A JPH02290923 A JP H02290923A
- Authority
- JP
- Japan
- Prior art keywords
- steel plate
- cooling
- water
- cooling water
- cooled
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000001816 cooling Methods 0.000 title claims abstract description 17
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 16
- 239000010959 steel Substances 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims description 10
- 239000000498 cooling water Substances 0.000 claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000007787 solid Substances 0.000 claims abstract description 12
- 239000002245 particle Substances 0.000 claims description 14
- 238000005096 rolling process Methods 0.000 abstract description 7
- 239000004793 Polystyrene Substances 0.000 abstract description 2
- 229920002223 polystyrene Polymers 0.000 abstract description 2
- 239000008187 granular material Substances 0.000 abstract 5
- 229920000642 polymer Polymers 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 4
- 239000002826 coolant Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
Description
【発明の詳細な説明】
く産業上の利用分野〉
本発明は、鋼板の冷ｆａｌ１方法に関する．〈従来の技
術〉
従来から、制御圧延材や加速冷却あるいは直接焼入材の
ように圧延ライン上で材質を作り込む鋼板を圧延する際
には、例えば特開昭６２− ９３０１０号公報に記載さ
れているように、圧延の中間段階で鋼板の温度調整を行
うべく、冷却媒体として水あるいは空気を用いて、ノズ
ルまたはスリンｉから水流あるいは気流として噴出させ
ながら冷Ｊｌｌｌする方式が採用されている。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for cooling steel plates. <Prior art> Conventionally, when rolling steel plates whose properties are created on a rolling line, such as controlled rolling materials, accelerated cooling, or direct quenching materials, there has been a method described in, for example, Japanese Patent Laid-Open No. 62-93010. In order to adjust the temperature of the steel plate during the intermediate stage of rolling, a method is adopted in which water or air is used as a cooling medium and is cooled while jetting water or air from a nozzle or sulin i.
しかし、冷却媒体に空気を用いる場合は、その温度調整
に要する時間が多大となるから、ミルの生産性を低下さ
せるという問題がある。それ故、通常はミルデスケーリ
ングシャワー１１ｋ水設備などを利用した水冷方式が用
いられているのが一般的である。However, when air is used as the cooling medium, it takes a lot of time to adjust the temperature, so there is a problem that the productivity of the mill is reduced. Therefore, a water cooling system using a Mildescaling shower 11k water facility is generally used.
く発明が解決しようとする課題〉
しかしながら、水冷方式を用いる場合においても、使用
されるノズルやスリットには固有のヒ１Ｓ界レイノルズ
数があるため、それを越えるような大きな水量域で使用
するときは層流から乱流にｉ！！移してしまい、その伝
熱効率を著しくｍなうことになる．そこで、ノズルやス
リットの形状などを改着することも種々試みられている
が、その冷却能の向上には自ずと限界があり、やはり生
産性に影響するという問題がある。Problems to be Solved by the Invention> However, even when using a water cooling system, the nozzles and slits used have their own H1S field Reynolds number, so when used in a large water flow range that exceeds this number, changes from laminar flow to turbulent flow i! ! This will significantly reduce the heat transfer efficiency. Therefore, various attempts have been made to modify the shapes of nozzles and slits, but there is a limit to the improvement of the cooling capacity, and there is still the problem that productivity is affected.
本発明は、上記のような課題を解決したものであって、
冷却水を用いて冷却する場合においてその層流の範囲を
広くすることの可］ｉヒな洞仮の冷却方法を提供するこ
とを「１的とする。The present invention solves the above problems, and
One object of the present invention is to provide a method for cooling a cavern that is capable of widening the range of laminar flow when cooling water is used.
〈課題を解決するだめの手段〉
本発明は、圧延後の熱間鋼板もしくは熱処理された加熱
鋼板をノズルまたはスリットから吐出する水流を用いて
冷却するに際し、冷却水中に粒径ｌｗ以下の固体粒子を
混入さ−ｌるようにして、上記［Ｉ的を達成しようとす
るものである．く作 用〉
本発明者は、冷却水の層流の範囲を拡大すべく種々研究
・実験を行った結果、■水流の乱流遷移を遅らーＵるに
は、冷却水の臨界レイノルズ数を高くずる必要があるこ
と、■そのためには、水中に固体粒子を？ｎ人させると
、いわゆる１・ムズ効果（Ｔｏ＃Ｉｓ ａｆｆｅｃｔ）
によって乱流ｌ′ｉ′：擦抵抗が著しく減少することの
２点を見出し、この知見に基づいて本発明を完成させる
に至った．
混入させる固体粒子としては、例えばポリエチレン，ボ
リスチレン等高分了材料など水中に懸濁される固体状の
ものであればよく、またその粒径は１ｍｍ以下のものが
望ましい。その理由は、粒子後流で生成される攪乱によ
って粒子による流体の束縛効果が大きくなるためである
。さらに、その混入割合は、上記両効果の大小関係およ
び経済１′Ｉより体積濃度でｏ．ｉ−ｉ％の範囲が望ま
しい。<Means for Solving the Problem> The present invention provides a method for cooling a rolled hot steel plate or a heat-treated heated steel plate using a water stream discharged from a nozzle or slit, in which solid particles having a particle size of lw or less are added to the cooling water. The aim is to achieve the above objectives by incorporating As a result of conducting various studies and experiments to expand the range of laminar flow of cooling water, the inventor found that: ■ To delay the turbulent transition of water flow, the critical Reynolds number of cooling water ■ To do that, do we need to increase the amount of solid particles in the water? If you let n people do it, you get the so-called 1-mes effect (To#Is effect).
The authors discovered two points: turbulent flow l'i': frictional resistance is significantly reduced, and based on these findings, they have completed the present invention. The solid particles to be mixed may be solid particles that can be suspended in water, such as high-dispersion materials such as polyethylene and polystyrene, and preferably have a particle size of 1 mm or less. The reason for this is that the turbulence generated in the trailing stream of the particles increases the fluid binding effect of the particles. Furthermore, the mixing ratio is determined by the volume concentration of o. A range of ii% is desirable.
〈実施例〉
以下に、本発明の実施例について、図面を参照して説明
する．
第１図は、本発明方法に係る一実施例を示す概要図であ
る．
図に示すように、冷却水へ冫ダｌには、複数のノズル２
、２・・・が図示しない鋼板に向けて配列される．そし
て、図示しない水源から供給される冷却水が供給管３を
介して冷却水へッグｌに導かれる。<Examples> Examples of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram showing an embodiment of the method of the present invention. As shown in the figure, a plurality of nozzles 2 are connected to the cooling water.
, 2... are arranged toward a steel plate (not shown). Cooling water supplied from a water source (not shown) is guided to the cooling water tank 1 via the supply pipe 3.
この供給管３には、冷却水流星検出器４，冷却水流１ｆ
ｉ調節弁５が取付けられ“ζおり、冷却水流亜調節計６
によって所定の水量に調節される．また、冷却水流ｍ
ＡｔｇｆｌｌＴ弁５の下流には、混合器７が設りられて
おり、固体粒子ボンパ８に収容された固体粒子９がフィ
ーダｌＯにＪ；って混合器７へｔＲ人される．その混人
■は、比率調ｆ！［ｔｌｌによって冷却水■との関係で
決定される．
そこで、上記した装置を用いて実験を行った。This supply pipe 3 includes a cooling water meteor detector 4 and a cooling water flow 1f.
The i control valve 5 is installed and the cooling water flow sub-controller 6
The amount of water is adjusted to the specified amount. Also, the cooling water flow m
A mixer 7 is provided downstream of the AtgflIT valve 5, and the solid particles 9 contained in the solid particle bomber 8 are fed to the mixer 7 through the feeder lO. The mixed crowd ■ is proportion-like f! [Determined by tll in relation to cooling water ■. Therefore, an experiment was conducted using the above-mentioned apparatus.
水中に、固体粒子として粒径が０．２ ｒｒｔａφのポ
リエチレンを０．３％混入したところ、その臨界レイノ
ルズ数を２４５０と従来の冷却水の臨界レイノルズ＃！
Ｉ２３００に比し゜ζ６．５％ほど高めることができ、
屑流状態で流し得る水最の限界を、従来の４（ｉ０ ／
／１ｎから４９０／／＋＊ｉｎまで高め得ることがで
きた．なお、本発明は、圧延ライン上での熱間鋼板のみ
を対象にするのではなく、熱処理によっ′Ｃ加熱される
ｆｉｔ板の焼入れの際などにも適用することができるこ
とはいうまでもない．
く発明の効果〉
本発明によれば、冷却水の臨界レイノルズ数を高めるこ
とができるから、従来の水冷方法ではえられなかった高
冷却能が安定して得られ、冷却材の月質の安定化を図る
ことができる．
また、従来、冷却能不足のために制御冷却の適川を行う
ことのできなかったてｊ法範囲のｊＩｌ４仮についても
適用することが可能である。When 0.3% polyethylene with a particle size of 0.2 rrtaφ was mixed into water as solid particles, its critical Reynolds number was 2450, which is the same as the critical Reynolds number of conventional cooling water.
It can be increased by ゜ζ6.5% compared to I2300,
The maximum limit of water that can flow in a waste flow state is determined by the conventional 4(i0 /
/1n to 490//+*in. It goes without saying that the present invention is not only applicable to hot steel plates on a rolling line, but can also be applied to the quenching of fit plates that are heated by heat treatment. ．． Effects of the Invention According to the present invention, since the critical Reynolds number of the cooling water can be increased, a high cooling capacity that could not be obtained with conventional water cooling methods can be stably obtained, and the quality of the coolant can be stabilized. It is possible to aim for Furthermore, it is also possible to apply the present invention to jIl4 temporary in the j method range, where controlled cooling could not be performed conventionally due to insufficient cooling capacity.
第１図は、本発明方法に係る−・実施例を示す概要図で
ある．
ｌ・・・冷却水ヘッダ， ２・・・ノズル．３・・・
供給管． ４・・・冷却水流量検出器．５・・
・冷却水流量調節弁．FIG. 1 is a schematic diagram showing an embodiment of the method of the present invention. l...Cooling water header, 2...Nozzle. 3...
Supply pipe. 4...Cooling water flow rate detector. 5...
・Cooling water flow control valve.
Claims (1)
ルまたはスリットから吐出する水流を用いて冷却するに
際し、冷却水中に粒径１ｍｍ以下の固体粒子を混入させ
ることを特徴とする鋼板の冷却方法。A method for cooling a steel plate, which comprises mixing solid particles with a particle size of 1 mm or less into the cooling water when cooling a rolled hot steel plate or a heat-treated heated steel plate using a water stream discharged from a nozzle or slit. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10728289A JPH02290923A (en) | 1989-04-28 | 1989-04-28 | Method for cooling steel plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10728289A JPH02290923A (en) | 1989-04-28 | 1989-04-28 | Method for cooling steel plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02290923A true JPH02290923A (en) | 1990-11-30 |
Family
ID=14455127
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10728289A Pending JPH02290923A (en) | 1989-04-28 | 1989-04-28 | Method for cooling steel plate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02290923A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019174826A1 (en) * | 2018-03-12 | 2019-09-19 | Sms Group Gmbh | Cooling unit of a laminar cooling device |
-
1989
- 1989-04-28 JP JP10728289A patent/JPH02290923A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019174826A1 (en) * | 2018-03-12 | 2019-09-19 | Sms Group Gmbh | Cooling unit of a laminar cooling device |
| CN111836687A (en) * | 2018-03-12 | 2020-10-27 | Sms集团有限公司 | Cooling group of laminar flow cooling device |
| CN111836687B (en) * | 2018-03-12 | 2023-03-31 | Sms集团有限公司 | Cooling group of laminar flow cooling device |
| US11745237B2 (en) | 2018-03-12 | 2023-09-05 | Sms Group Gmbh | Cooling unit of a laminar cooling device |
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