JPH03281011A - Cooling method for thick steel plate - Google Patents
Cooling method for thick steel plateInfo
- Publication number
- JPH03281011A JPH03281011A JP7709990A JP7709990A JPH03281011A JP H03281011 A JPH03281011 A JP H03281011A JP 7709990 A JP7709990 A JP 7709990A JP 7709990 A JP7709990 A JP 7709990A JP H03281011 A JPH03281011 A JP H03281011A
- Authority
- JP
- Japan
- Prior art keywords
- zone
- steel plate
- cooling
- offset amount
- tail end
- 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.)
- Granted
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 53
- 239000010959 steel Substances 0.000 title claims abstract description 53
- 238000001816 cooling Methods 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 18
- 238000005096 rolling process Methods 0.000 abstract description 3
- 238000002347 injection Methods 0.000 description 9
- 239000007924 injection Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 6
- 238000004781 supercooling Methods 0.000 description 5
- 239000000498 cooling water Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 230000011514 reflex Effects 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)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野ｊ
本発明は厚鋼板の冷却方法に関し、さらに詳しくは側副
冷却において水冷中に生ずる鋼板先尾端部の過冷却を防
止して矯正後温度むらによる冷却歪の発生を防止する冷
却方法に関する。[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a method for cooling a thick steel plate, and more specifically, in side cooling, the temperature after straightening is reduced by preventing overcooling of the leading and trailing ends of the steel plate that occurs during water cooling. The present invention relates to a cooling method that prevents the occurrence of cooling distortion due to unevenness.
〔従来の技術］
厚鋼板の先尾端部の過冷却を防止する方法として本出願
人は、特開昭５９−１１０７３８号を提案した。この方
法は先尾端部の冷却時間をそれ以外の部分の冷却時間よ
り短くなるように制御する方法である。この方法も効果
はあったが先尾端か適冷されるという傾向は残っていた
。この原因について検工４シた結果１本出願人は特開昭
６１−７６６２４号を提案した。[Prior Art] As a method for preventing supercooling of the leading and trailing ends of a thick steel plate, the applicant proposed Japanese Patent Application Laid-open No. 110738/1983. This method is a method of controlling the cooling time of the leading and trailing parts so that it is shorter than the cooling time of other parts. This method was also effective, but the tendency remained that only the leading and trailing ends were cooled properly. As a result of four investigations into the cause of this problem, the applicant proposed Japanese Patent Application Laid-open No. 76624/1983.
この方法は鋼板先端部の過冷却が冷却装置下部ノズルか
らの冷却水を鋼板先端部がすくい取っていく、いわゆる
すくい水による冷却が付加されるためであることをつき
とめ、この効果を考慮してオフセット量を決めるもので
ある。This method is based on the finding that the supercooling of the tip of the steel plate is due to the addition of cooling by the so-called scoop water, in which the tip of the steel plate scoops up the cooling water from the lower nozzle of the cooling device, and takes this effect into consideration. This determines the amount of offset.
すなわち第５図に示すような工程で冷却を行っていた。That is, cooling was performed in a process as shown in FIG.
すなわち。Namely.
■圧延完了後の鋼板をＡＣＣ（自動冷却制御ｉｔ）設備
へ搬送する。■Transport the steel plate after rolling to the ACC (automatic cooling control IT) equipment.
■鋼板の先端オフセット量を検出した時、１〜４ゾーン
の注水を開始する。■When the tip offset amount of the steel plate is detected, start water injection in zones 1 to 4.
■鋼板を冷却中。■Cooling the steel plate.
■鋼板の尾端オフセット量を検出した時１〜４ゾーンの
注水を停止する。■Stop water injection in zones 1 to 4 when the tail end offset amount of the steel plate is detected.
この方法でも完全に過冷却を防止することはできず、ま
た鋼板の尾端については特開昭５９−１１０７３８号と
変わらないという問題が残っていた。Even with this method, supercooling could not be completely prevented, and the problem remained that the tail end of the steel plate was the same as in JP-A-59-110738.
［発明が解決しようとする課題Ｊ
厚鋼板の冷却方法について種々研究がなされてきたが、
従来技術においては先尾端部に発生する過冷却部を十分
に防止することができず、また、オフセット量を増加さ
せることにより過冷却を防止しようとすると、逆に厚鋼
板の先尾端部より中央部に少し入ったところでは冷却が
不十分となり冷却停止温度が高（なり製品品質を阻害す
るという問題があった。[Problem to be solved by the invention J Various studies have been conducted on cooling methods for thick steel plates.
In the conventional technology, it is not possible to sufficiently prevent the overcooling that occurs at the leading and trailing ends, and when attempting to prevent overcooling by increasing the amount of offset, the leading and trailing ends of the thick steel plate conversely There was a problem that cooling was insufficient at a point slightly further into the center, resulting in a high cooling stop temperature (which impeded product quality).
本発明はこのような問題を解決して、厚鋼板の先尾端部
の過冷却を防止して、均一冷却を行い製品品質の向上を
図る。厚鋼板の冷却方法を提供することを課題とするも
のである。The present invention solves these problems, prevents overcooling of the leading and trailing ends of a thick steel plate, achieves uniform cooling, and improves product quality. The object of the present invention is to provide a method for cooling thick steel plates.
〔課題を解決するための手段Ｊ
本発明は、厚鋼板をオンライン加速冷却装置で冷却する
厚鋼板の冷却方法に適用され１次の方法を採った。すな
わち、
冷却装置を厚鋼板の搬送方向に複数のゾーンに分割し。[Means for Solving the Problems J] The present invention is applied to a method of cooling a thick steel plate in which the thick steel plate is cooled by an online accelerated cooling device, and the first method is adopted. In other words, the cooling system is divided into multiple zones in the conveying direction of the steel plate.
厚鋼板先端の非冷却オフセット部が順次各ゾーンに装入
された時点から当該ゾーンの冷却を開始し、厚鋼板尾端
の非冷却オフセット部が順次各ゾーンの出側に到達した
ときに当３ゾーンの冷却を停止すると共に各ゾーンにお
ける冷却開始、停止のタイミングを個々に制御すること
を特徴とする厚鋼板の冷却方法である。When the uncooled offset part at the tip of the thick steel plate is sequentially charged into each zone, cooling of the zone is started, and when the uncooled offset part at the tail end of the thick steel plate reaches the exit side of each zone in sequence, the cooling of the zone starts. This method of cooling a thick steel plate is characterized by stopping cooling of a zone and individually controlling the timing of starting and stopping cooling in each zone.
〔作用］
先端部の過冷却の原因は、下部冷却水のすくい水と、鋼
板の先端下部の冷却水の水温がその他の部分より低いこ
とによる。又１尾端部の過冷却の原因は、鋼板の上部に
冷却水が滞留することによるものである１本発明方法は
これらの原因を取除くことにある。[Effect] The cause of supercooling at the tip is that the temperature of the lower cooling water and the cooling water at the bottom of the tip of the steel plate are lower than other parts. Also, the cause of supercooling at the tail end is that cooling water remains in the upper part of the steel plate.The method of the present invention aims to eliminate these causes.
本発明方法の各工程を第１図によって説明する。Each step of the method of the present invention will be explained with reference to FIG.
■圧延完了後の鋼板を自動冷却側ｒＢ（以下ＡＣＣとい
う）設備へ搬送する。■Transport the steel plate after rolling to the automatic cooling side rB (hereinafter referred to as ACC) equipment.
■４ゾーン内で鋼板の先端オフセット量を検出したとき
、４ゾーンの注水を開始する
（ＡＣＣＩ＄１１始）、（先端オフセット１回目）０３
ゾーン内で鋼板の先端オフセット量を検出したとき、３
ゾーンの注水を開始する。■When the tip offset amount of the steel plate is detected within the 4 zones, water injection in the 4 zones starts (ACCI $11 start), (1st tip offset) 03
When the tip offset amount of the steel plate is detected within the zone, 3
Start watering the zone.
（先端オフセット２回目）
＠２ゾーン内で鋼板の先端オフセット量を検出したとき
、２ゾーンの注水を開始する。(2nd tip offset) @When the tip offset amount of the steel plate is detected in zone 2, water injection into zone 2 starts.
（先端オフセット３回目）
＠１ゾーン内で鋼板の先端オフセット量を検出したとき
、■ゾーンの注水を開始する。(3rd tip offset) When the tip offset amount of the steel plate is detected in @1 zone, start water injection in zone ■.
（先端オフセット４回目）
■４ゾーン内で鋼板の尾端オフセット量を検出したとき
、４ゾーンの注水を停止する。(Fourth tip offset) ■When the tail end offset amount of the steel plate is detected within the 4th zone, stop water injection in the 4th zone.
（尾端オフセット１回目）
■３ゾーン内で鋼板の尾端オフセット量を検出したとき
、３ゾーンの注水を停止する。(Tail end offset 1st time) ■When the amount of tail end offset of the steel plate is detected within the 3 zones, water injection in the 3 zones is stopped.
（尾端オフセット２回目）
［有］２ゾーン内で鋼機の尾端オフセット量を検出した
とき、２ゾーンの注水を停止する。(Second tail end offset) [Yes] When the tail end offset amount of the steel machine is detected within the 2 zones, water injection in the 2 zones will be stopped.
（尾端オフセット３回目）
■ｌゾーン内で鋼板の尾端オフセット量を検出したとき
、■ゾーンの注水を停止する。(3rd tail end offset) ■When the tail end offset amount of the steel plate is detected in the l zone, water injection in the ■zone is stopped.
（尾端オフセット４回目）（ＡＣＣ終了）。(4th tail end offset) (ACC end).
すなわち、従来例では第４図に示すようにＡＣＣ開始時
と終了時に鋼板の先尾端部に１回ずつオフセット量を設
定したものであるが１本発明においてはＷ４板の先尾端
部か通過するゾーン毎にオフセット量を設定すると共に
各ゾーンにおける冷却開始、停止のタイミングを個々に
制御することができる。従って、従来よりさらにきめの
細がい冷却制御を行うことが可能となるのでより均一冷
却に近付けることができる。That is, in the conventional example, as shown in Fig. 4, the amount of offset is set once at the leading and trailing ends of the steel plate at the start and end of ACC, but in the present invention, the amount of offset is set at the leading and trailing ends of the W4 plate. It is possible to set an offset amount for each zone passed through and to individually control the timing of cooling start and stop in each zone. Therefore, it becomes possible to perform cooling control with a finer grain than in the past, and it is therefore possible to achieve more uniform cooling.
すくい水、水温等の影響を考慮しない場合、従来例の先
端又は尾端の中央部との冷却能の比は、（Ｌ−ＬＴ）／
Ｌ 又は （Ｌ−Ｌｅ）／Ｌ
となる、これに対して本発明法では。When the effects of scoop water, water temperature, etc. are not taken into account, the ratio of the cooling capacity of the conventional example between the tip or the center of the tail is (L-LT)/
L or (L-Le)/L, whereas in the method of the present invention.
Ｌｖ＞ｆｆ７．ＬＢ＞Ｉ２ｅであＱ、先尾端（７） オ
フセット長さを短くできる。Lv>ff7. When LB>I2e, Q, leading end (7) offset length can be shortened.
なお、本実施例ではｎ＝４としている。Note that in this embodiment, n=4.
〔実施例１
本発明の実施例を従来例と比較して図面により説明する
。[Embodiment 1] An embodiment of the present invention will be explained with reference to the drawings in comparison with a conventional example.
（１）鋼板の温度分布について
（ａ）通過方式
実施例のオフセット量
先端 ３５００ｍｍ 尾端２０００ｍｍ板番ＤＧ１４
６ 板厚１８ｍｍ
板長 ３２２００ｍｍ
従来例のオフセ・ント量
先：ｔ４ ４８００ｍｍ 尾端２８００ｍｍ板番ＤＢ
Ｏ１２板厚１８ｍｍ
板長 ３１４５０ｍｍ
の場合の鋼板長手方向の温度分布を第２図に示す。第２
図（ａ）は本発明、第２図（ｂ）は従来例である。なお
、温度分布は鋼板のセンターで測定したものである。こ
れらの図面から特に先端部の過冷却防止に効果のあるこ
とが明白である。(1) Temperature distribution of steel plate (a) Offset amount of passing method example Tip: 3500mm Tail end: 2000mm Plate number DG14
6 Plate thickness 18mm Plate length 32200mm Conventional example offset amount tip: t4 4800mm Tail end 2800mm Plate number DB
Figure 2 shows the temperature distribution in the longitudinal direction of the steel plate when the O12 plate thickness is 18 mm and the plate length is 31450 mm. Second
FIG. 2(a) shows the present invention, and FIG. 2(b) shows the conventional example. Note that the temperature distribution was measured at the center of the steel plate. From these drawings, it is clear that the method is particularly effective in preventing overcooling of the tip.
（ｂ）同時−前冷却方式
本実施例のオフセット量
先端 ３５００ｒｎｍ 尾端３３００ｍｍ板番りに１
６７ 板厚１５ｍｍ
板長 ３１３００ｍｍ
従来例のオフセット量
先端 ２５００ｍｍ 尾端１６００ｍｍ板番Ｄ３１５
５ 板厚１８ｍｍ
板長 ２２１３０ｍｍ
の場合の鋼板長手方向の温度分布を第３図に示す。第３
図（ａ）は本発明、第３図（ｂ）は従来例である。なお
、′１Ｍ度分布は鋼板のセンターで測定したものである
。(b) Simultaneous-pre-cooling method Offset amount of this example: Tip: 3500 rnm Tail end: 3300 mm 1 per plate number
67 Plate thickness 15mm Plate length 31300mm Conventional offset amount tip 2500mm Tail end 1600mm Plate number D315
5. Figure 3 shows the temperature distribution in the longitudinal direction of the steel plate when the plate thickness is 18 mm and the plate length is 22130 mm. Third
FIG. 3(a) shows the present invention, and FIG. 3(b) shows the conventional example. Note that the '1M degree distribution was measured at the center of the steel plate.
この場合、？ｉＡ度分布は本発明においては、従来例よ
り先端の落ち方は小さくなっているかオフセットが一定
であるのに対して通板距離が指定ゾーン数、板長によっ
て変化するためその効果にばらつきがある。in this case,? In the iA degree distribution of the present invention, the drop of the tip is smaller than in the conventional example, or the offset is constant, but the passing distance varies depending on the number of designated zones and the length of the plate, so the effect varies. .
（２）再矯正率について 操業方法を従来法から本発明法に変更したが。(2) Regarding re-correction rate The operating method was changed from the conventional method to the method of the present invention.
保熱矯正率は従来８％程度であったものが本発明法の採
用によって３％程度迄大幅に低下した。The thermal straightening rate, which was conventionally about 8%, was significantly reduced to about 3% by adopting the method of the present invention.
〔発明の効果Ｊ 本発明は次のような優れた効果を奏する。[Effects of the invention J The present invention has the following excellent effects.
■鋼板の先尾端部におレフろ過冷却が著しく減少し、製
品の品質が向上した。■Reflex filtration cooling at the leading and trailing ends of the steel plate has been significantly reduced, improving product quality.
■再矯正率が大幅に低下することになり生産性が向上し
た。■Productivity improved as the re-straightening rate decreased significantly.
第１図は本発明の冷却工程の説明図、第２図〜第３図は
本発明の実施例であり、第２図は通過冷却の場合の鋼板
長手方向温度分布のグラフを示し、第２図（ａ）は本発
明、第２図（ｂ）は従来例、第３図は同時−前冷却の場
合の鋼板長手方向温度分布のグラフを示し、第３図（ａ
）は本発明、第３図（ｂ）は従来例、第４図は従来例の
冷却工程の説明図である。
出
願
人
川崎製鉄株式会社
代
理
人Figure 1 is an explanatory diagram of the cooling process of the present invention, Figures 2 and 3 are examples of the present invention, Figure 2 is a graph of the temperature distribution in the longitudinal direction of the steel plate in the case of passage cooling; Figure (a) shows the graph of the temperature distribution in the longitudinal direction of the steel sheet in the case of the present invention, Figure 2 (b) shows the conventional example, and Figure 3 shows the graph of the temperature distribution in the longitudinal direction of the steel plate in the case of simultaneous-precooling.
) is an explanatory diagram of the cooling process of the present invention, FIG. 3(b) is a conventional example, and FIG. 4 is an explanatory diagram of the cooling process of the conventional example. Applicant Kawasaki Steel Co., Ltd. Agent
Claims (1)
り、冷却装置を厚鋼板の搬送方向に複数のゾーンに分割
し、厚鋼板先端の非冷却オフセット部が順次該各ゾーン
に装入された時点から当該ゾーンの冷却を開始し、厚鋼
板尾端の非冷却オフセット部が順次該各ゾーンの出側に
到達したときに当該ゾーンの冷却を停止すると共に該各
ゾーンにおける冷却開始、停止のタイミングを個々に制
御することを特徴とする厚鋼板の冷却方法。1. When cooling a thick steel plate using an online accelerated cooling device, the cooling device is divided into multiple zones in the conveying direction of the steel plate, and from the time when the uncooled offset portion of the tip of the thick steel plate is sequentially charged into each zone, Cooling of the zone is started, and cooling of the zone is stopped when the uncooled offset part of the tail end of the thick steel plate reaches the exit side of each zone in sequence, and the timing of starting and stopping cooling in each zone is individually set. A method for cooling a thick steel plate characterized by controlling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2077099A JP2941878B2 (en) | 1990-03-28 | 1990-03-28 | Cooling method of steel plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2077099A JP2941878B2 (en) | 1990-03-28 | 1990-03-28 | Cooling method of steel plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03281011A true JPH03281011A (en) | 1991-12-11 |
| JP2941878B2 JP2941878B2 (en) | 1999-08-30 |
Family
ID=13624342
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2077099A Expired - Fee Related JP2941878B2 (en) | 1990-03-28 | 1990-03-28 | Cooling method of steel plate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2941878B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112404142A (en) * | 2020-09-20 | 2021-02-26 | 宝钢特钢韶关有限公司 | Cooling control system of manipulator guard plate |
-
1990
- 1990-03-28 JP JP2077099A patent/JP2941878B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112404142A (en) * | 2020-09-20 | 2021-02-26 | 宝钢特钢韶关有限公司 | Cooling control system of manipulator guard plate |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2941878B2 (en) | 1999-08-30 |
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