JPH0122326B2 - - Google Patents
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- Publication number
- JPH0122326B2 JPH0122326B2 JP55089983A JP8998380A JPH0122326B2 JP H0122326 B2 JPH0122326 B2 JP H0122326B2 JP 55089983 A JP55089983 A JP 55089983A JP 8998380 A JP8998380 A JP 8998380A JP H0122326 B2 JPH0122326 B2 JP H0122326B2
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- JP
- Japan
- Prior art keywords
- cooling
- steel bar
- cooling water
- cylinder
- diameter
- 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.)
- Expired
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- Heat Treatments In General, Especially Conveying And Cooling (AREA)
- Heat Treatment Of Articles (AREA)
Description
この発明は、熱間圧延された棒鋼材を、全長に
わたり均等に、かつ効率的に強制冷却し得る、棒
鋼材の冷却方法に関するものである。
棒鋼の製造に当り、熱間圧延の最終スタンドを
出た高温の棒鋼材は、冷却床において冷却された
後、所定の長さに切断され、製品となる。
上記した高温の棒鋼材を冷却するに当り、これ
を空気中での自然冷却により行なうと、前記棒鋼
材の最終パス時における温度が950〜1050℃の高
温のため、冷却に長時間を要し、その間における
空気中の酸素との接触時間が長いので、酸化量が
多くなる。その結果、棒鋼材の表面に、二次スケ
ールが発生し、外観、加工性、施工性等が劣化し
て、製品の品質低下を招く上、冷却に長時間を要
するところから、冷却床に広い面積を必要とし、
設備の大型化、高温による環境悪化等の問題が生
ずる。
上記問題を解決するため、従来から熱間圧延後
の棒鋼材を冷却水により強制冷却することが行な
われている。このような強制冷却の方法として、
従来、
二重水冷筒式冷却用筒体による冷却
スプレーノズルによる冷却
が知られている。第１図は上記の二重水冷筒式
冷却用筒体の概略正面図で、冷却用筒体は、冷却
水の導入管３が設けられた外筒１と、外筒１より
小径の内筒２とからなり、内筒２には、その円周
方向にわたつて、内筒２の軸線を通過する棒鋼材
５に対し、法線方向に複数の冷却水噴出口４が設
けられ、外筒１と内筒２との間に、導入管３から
送りこまれた冷却水を前記噴出口４から内筒２内
へ噴出させ、この噴出流および内筒２内に充満し
た冷却水によつて、棒鋼材５の冷却が行なわれ
る。
第２図は上記のスプレーノズル式冷却体の概
要を示す慨略正面図で、冷却水の導入管６が設け
られたリング状の冷却管７に、その軸芯を通過す
る棒鋼材５に対し、法線方向に複数のスプレーノ
ズル８が設けられており、このようなリング状の
冷却管７を、棒鋼材５のパスラインに沿つて一定
の間隔で複数個列設の上、前記スプレーノズル８
から噴出する冷却水により、棒鋼材５の冷却が行
なわれる。
しかるに、上記の二重水冷筒式冷却用筒体を
使用した冷却には、次のような問題があつた。
(1) 被冷却材が異形棒鋼の場合は、冷却水噴出口
４から常時冷却水が噴射されていると、前記異
形棒鋼材５が内筒２内へ進入したときに、異形
棒鋼材５に形成されている横ふしによつて、内
筒２内に充満されている冷却水が、異形棒鋼材
の進行方向に一時的に押出される現象が生ず
る。その結果、異形棒鋼材のパス方向先端部付
近と、その他の部分とでは、冷却後の温度に大
きな差が生じ、先端部付近のみが過冷却となる
ため、全長にわたる均等冷却が不可能となる。
例えば、異形棒鋼材５の先端部付近以外の表面
温度が、冷却後850℃となるように冷却流量を
設定して冷却を行なつた場合、その先端部から
５〜６ｍの部分は、500〜700℃に過冷却され
る。その結果、異形棒鋼材５にその長さ方向に
わたる彎曲が生じ、以降の工程におけるトラブ
ルの原因となる。
(2) 異形棒鋼材５に形成された、各横ふし部分の
冷却状態を見ると、異形棒鋼材５の進行方向に
面した横ふしの前面側は、反対の横ふし後面側
に比べ、冷却水に多く接触する結果、過冷却と
なり、温度降下が大きい。このように、横ふし
の前面側と後面側とにおける冷却温度の相違
は、異形棒鋼材５の硬度、降伏点等、機械的性
質に大きな影響を与え、また赤さび状の付着物
（Fe2O3・xH2O）の発生を招く。
(3) 噴出口４からの冷却水噴射を常時行なわず、
異形棒鋼材５の先端が冷却用筒体に進入したと
きに、これを検知して冷却水の噴射を開始し、
異形棒鋼材全長にわたつて均一な温度となるよ
うに、冷却水の水量等を制御して冷却を行なえ
ば、上記した問題の(1)は解決されるが、棒鋼材
のパススピードが10〜30m/sに達する最近の高
速ミルにおいて、上記の如き制御注水を行なう
ことは容易でなく、そのためには、多額の設備
投資が必要とされる。
また、上記のスプレーノズル式冷却は、均等
冷却の点では優れているが、冷却能が小さいため
水冷ラインが長くなり、最近の高速ミルでは殆ん
ど応用が出来ない。
この発明は、上述のような観点から、熱間圧延
された棒鋼、特に異形棒鋼の冷却における上述し
た問題点を解決し、棒鋼の全長を均等に、かつ効
率的に強制冷却し得る、冷却用筒体を使用した棒
鋼材の冷却方法を提供するもので、冷却用筒体の
同一円周上に所定間隔をおき、かつ前記筒体の軸
線方向に所定間隔で配置された多数の噴射口を、
前記筒体の法線に対して所定角度傾斜させて設
け、前記噴射口から噴射される冷却水をして、筒
体の軸線に沿つて中空部を有する旋回流を形成さ
せると共に、前記中空部の径を少なくとも棒鋼材
の呼径より小となし、この中空部に棒鋼材を通過
させ、冷却水の旋回流によつて冷却を行なうこと
に特徴を有するものである。
次に、この発明を実施例により、図面と共に説
明する。
第３図には、この発明の方法に使用される冷却
用筒体の一例が長さ方向の断面図により、第４図
には、第３図のＡ―Ａ線断面図により示されてい
る。図面において、１４は外筒９と内筒１０とか
らなる冷却用筒体で、外筒９には冷却水の導入管
１１が設けられている。１２は、内筒１０に設け
られた複数の冷却水噴射口で、内筒１０の法線に
対して所定角度θ傾斜させて設けてあり、内筒１
０の同一円周上に等間隔で、かつ内筒１０の軸線
方向に所定間隔で配置されている。
このような冷却用筒体１４において、導入管１
１から外筒９と内筒１０との空間部に冷却水を注
水すると、前記冷却水は、内筒１０に設けられた
冷却水噴射口１２から、内筒１０内に噴射される
が、冷却水噴射口１２は上述した如く、内筒１０
の法線に対して所定角度θ傾斜させて形成されて
いるため、前記冷却水噴射口１２から噴射される
冷却水の流量が一定量以上になると、内筒１０内
で噴射された冷却水に慣性が発生し、冷却水は第
５図に示す如く内筒１０の内周に沿つて旋回を始
める。そして、この旋回による遠心力で、内筒１
０の軸線に沿つて中空部１３が生成される。
前記中空部１３は、内筒１０の径、冷却水の投
下水量、冷却水噴射口１２の傾斜角度等によつ
て、その径を自由に選択することができるから、
冷却すべき異形棒鋼材５の直径によつて、中空部
１３を適切な径となすことにより、前述した従来
技術の問題点を解決することができる。
即ち、上記した中空部１３の径を、異形棒鋼材
５が通過したときに、旋回する冷却水に触れて冷
却され、しかも、異形棒鋼材５に形成されている
横ふしによつて冷却水が押出されない程度の径に
すれば、異形棒鋼材５は、その先端部付近が過冷
却されることなく、全長にわたつて均一に冷却さ
れる。
このような中空部１３の径は、少なくとも異形
棒鋼材５の直径以下であることが必要で、直径以
上では冷却効果が少ない。
また、冷却水は、内筒１０の内周面に沿つて円
周方向に旋回しているから、異形棒鋼材５におけ
る各横ふし部分の、その進行方向から見て前面側
および反対の後面側のいずれも均一に冷却され、
従来の如く、横ふし前面側のみが過冷却されるこ
とはない。
上記した、内筒１０内に冷却水旋回流により形
成される中空部１３の径は、本発明者等による実
際の操業経験から、異形棒鋼材５の呼径の50〜80
％が好ましい。第６図イ，ロは、中空部１３の径
と異形棒鋼材５の呼径との関係を示す説明図であ
る。図面において、５は内筒１０内を通過する異
形棒鋼、５ａはその横ふし、５ｂはその縦ふし
で、１３は内筒１０内にその軸線に沿つて生成さ
れた中空部である。Ｄは異形棒鋼材５の呼径、Ａ
およびＢは、中空部１３の径で、ＡはＤ×80％の
場合、ＢはＤ×50％の場合を示す。
第１表には、異形棒鋼５の呼径Ｄが32mm、25
mm、および16mmの場合において、内筒１０に形成
された中空部１３の径を、異形棒鋼５の呼径の30
〜100％となした場合における異形棒鋼５の冷却
状態が示されている。なお、同表において、呼径
が32mmの異形棒鋼５に対し、その呼径の50％の中
空部１３を形成させる場合の条件は、下記の通り
であり、その他各種の径の中空部は、下記に準じ
て形成される。
内筒径 ：80mm
冷却水噴射口の傾斜角度： 5゜
冷却水の流量 ： 4/s
The present invention relates to a method for cooling a hot-rolled steel bar, which can forcefully and efficiently cool the hot-rolled steel bar uniformly and efficiently over its entire length. In manufacturing steel bars, high-temperature steel bars exit the final stand of hot rolling, are cooled on a cooling bed, and then cut into predetermined lengths to become products. When cooling the above-mentioned high-temperature steel bar by natural cooling in the air, the temperature during the final pass of the steel bar is as high as 950 to 1050°C, so it takes a long time to cool it down. During this period, the contact time with oxygen in the air is long, so the amount of oxidation increases. As a result, secondary scale occurs on the surface of the steel bar, deteriorating the appearance, workability, workability, etc., leading to a decline in product quality. requires area,
Problems arise such as increased equipment size and environmental deterioration due to high temperatures. In order to solve the above-mentioned problems, it has been conventionally practiced to forcibly cool the hot-rolled steel bar with cooling water. As a method of forced cooling,
Conventionally, cooling using a double water-cooled cooling cylinder and cooling using a spray nozzle are known. FIG. 1 is a schematic front view of the above-mentioned double water-cooled cylinder type cooling cylinder. 2, the inner cylinder 2 is provided with a plurality of cooling water spouts 4 in the normal direction to the steel bar 5 passing through the axis of the inner cylinder 2 in the circumferential direction. 1 and the inner cylinder 2, the cooling water sent from the introduction pipe 3 is jetted into the inner cylinder 2 from the spout 4, and by this jet flow and the cooling water filling the inner cylinder 2, Cooling of the steel bar 5 is performed. Fig. 2 is a schematic front view showing the outline of the above-mentioned spray nozzle type cooling body. , a plurality of spray nozzles 8 are provided in the normal direction, and a plurality of such ring-shaped cooling pipes 7 are arranged at regular intervals along the pass line of the steel bar 5, and the spray nozzles are 8
The steel bar material 5 is cooled by the cooling water spouted from the pipe. However, cooling using the above-mentioned double water-cooled cooling cylinder has the following problems. (1) When the material to be cooled is a deformed steel bar, if cooling water is constantly injected from the cooling water spout 4, when the deformed steel bar 5 enters the inner cylinder 2, the deformed steel bar 5 Due to the formed horizontal baffle, a phenomenon occurs in which the cooling water filled in the inner cylinder 2 is temporarily pushed out in the direction of movement of the deformed steel bar. As a result, there is a large difference in temperature after cooling between the tip of the deformed steel bar in the path direction and other parts, and only the tip is supercooled, making uniform cooling over the entire length impossible. .
For example, when cooling is performed by setting the cooling flow rate so that the surface temperature of the deformed steel bar 5 other than the vicinity of the tip becomes 850°C after cooling, the portion 5 to 6 meters from the tip will have a temperature of 500 to 850°C. Supercooled to 700℃. As a result, the deformed steel bar 5 is curved along its length, causing trouble in subsequent steps. (2) Looking at the cooling state of each horizontal weave formed on the deformed steel bar 5, the front side of the horizontal weave facing the direction of movement of the deformed steel bar 5 is cooled more than the rear side of the opposite horizontal weave. As a result of much contact with water, it becomes supercooled and the temperature drops significantly. As described above, the difference in cooling temperature between the front side and the rear side of the horizontal beam has a large effect on the mechanical properties such as the hardness and yield point of the deformed steel bar 5, and also causes rust-like deposits (Fe 2 O 3・xH 2 O). (3) Cooling water is not injected from the spout 4 all the time,
When the tip of the deformed steel bar 5 enters the cooling cylinder, this is detected and the injection of cooling water is started,
Problem (1) above can be solved by controlling the amount of cooling water etc. so that the temperature is uniform over the entire length of the deformed steel bar, but if the pass speed of the deformed steel bar is 10~ In recent high-speed mills reaching 30 m/s, it is not easy to perform controlled water injection as described above, and this requires a large amount of capital investment. Further, although the spray nozzle type cooling described above is excellent in terms of uniform cooling, the cooling capacity is small and the water cooling line becomes long, so it is hardly applicable to recent high-speed mills. From the above-mentioned viewpoints, the present invention solves the above-mentioned problems in cooling hot-rolled steel bars, especially deformed steel bars, and provides a cooling device that can uniformly and efficiently cool the entire length of the steel bar. This provides a method for cooling steel bars using a cylinder, and includes a number of injection ports arranged at predetermined intervals on the same circumference of the cooling cylinder and at predetermined intervals in the axial direction of the cylinder. ,
The cooling water injected from the injection port is provided to be inclined at a predetermined angle with respect to the normal line of the cylindrical body, and forms a swirling flow having a hollow portion along the axis of the cylindrical body. The diameter of the steel bar is at least smaller than the nominal diameter of the steel bar, and the steel bar is passed through this hollow part and cooled by a swirling flow of cooling water. Next, the present invention will be explained using examples and drawings. FIG. 3 shows a longitudinal cross-sectional view of an example of the cooling cylinder used in the method of the present invention, and FIG. 4 shows a cross-sectional view taken along the line A--A in FIG. . In the drawings, reference numeral 14 denotes a cooling cylinder consisting of an outer cylinder 9 and an inner cylinder 10, and the outer cylinder 9 is provided with a cooling water introduction pipe 11. Reference numeral 12 denotes a plurality of cooling water injection ports provided in the inner cylinder 10, which are inclined at a predetermined angle θ with respect to the normal line of the inner cylinder 10.
0 at equal intervals on the same circumference and at predetermined intervals in the axial direction of the inner cylinder 10. In such a cooling cylinder 14, the introduction pipe 1
1 into the space between the outer cylinder 9 and the inner cylinder 10, the cooling water is injected into the inner cylinder 10 from the cooling water injection port 12 provided in the inner cylinder 10. As described above, the water injection port 12 is connected to the inner cylinder 10.
Since the cooling water is formed to be inclined at a predetermined angle θ with respect to the normal line of Inertia is generated, and the cooling water begins to swirl along the inner periphery of the inner cylinder 10 as shown in FIG. Then, due to the centrifugal force caused by this rotation, the inner cylinder 1
A hollow portion 13 is created along the zero axis. The diameter of the hollow portion 13 can be freely selected depending on the diameter of the inner cylinder 10, the amount of cooling water thrown in, the inclination angle of the cooling water injection port 12, etc.
By making the hollow portion 13 have an appropriate diameter depending on the diameter of the deformed steel bar 5 to be cooled, the problems of the prior art described above can be solved. That is, when the deformed steel bar 5 passes through the diameter of the hollow portion 13 described above, it is cooled by coming into contact with the swirling cooling water, and furthermore, the cooling water is cooled by the horizontal flange formed in the deformed steel bar 5. If the diameter is set to such an extent that the deformed steel bar 5 will not be extruded, the deformed steel bar 5 will not be overcooled near its tip and will be uniformly cooled over its entire length. The diameter of such a hollow portion 13 needs to be at least the diameter of the deformed steel bar 5 or less, and if it is larger than the diameter, the cooling effect will be small. In addition, since the cooling water is swirling in the circumferential direction along the inner circumferential surface of the inner cylinder 10, the front side and the opposite rear side of each horizontal section of the deformed steel bar 5 when viewed from the direction of movement thereof. Both are uniformly cooled,
Unlike in the past, only the front side of the horizontal flap is not overcooled. The diameter of the hollow portion 13 formed by the swirling flow of cooling water in the inner cylinder 10 is determined to be 50 to 80% of the nominal diameter of the deformed steel bar 5, based on the actual operational experience of the present inventors.
% is preferred. 6A and 6B are explanatory diagrams showing the relationship between the diameter of the hollow portion 13 and the nominal diameter of the deformed steel bar 5. FIG. In the drawing, 5 is a deformed steel bar that passes through the inner cylinder 10, 5a is its horizontal slit, 5b is its vertical slit, and 13 is a hollow portion formed in the inner cylinder 10 along its axis. D is the nominal diameter of the deformed steel bar 5, A
and B is the diameter of the hollow portion 13, where A is D x 80% and B is D x 50%. Table 1 shows that the nominal diameter D of the deformed steel bar 5 is 32 mm and 25 mm.
mm, and 16 mm, the diameter of the hollow part 13 formed in the inner cylinder 10 is set to 30 mm of the nominal diameter of the deformed steel bar 5.
The cooling state of the deformed steel bar 5 is shown in the case of 100% to 100%. In addition, in the same table, the conditions for forming a hollow part 13 of 50% of the nominal diameter in a deformed steel bar 5 with a nominal diameter of 32 mm are as follows, and for hollow parts of various other diameters, It is formed according to the following. Inner cylinder diameter: 80mm Cooling water injection port inclination angle: 5° Cooling water flow rate: 4/s
【表】
上記第１表において、○印は適正冷却を、△印
はやや冷却不足を、×印は冷却不足を、●印はや
や局部過冷却を、そして、●●印は局部過冷却を
夫々示す。また、第７図は上記第１表の関係をグ
ラフで表わしたもので、Ｘは適正冷却領域を、Ｙ
は過冷却領域を、またＺは冷却不足領域を示す。
第１表および第７図から明らかなように、中空部
１３の径が、異形棒鋼の呼径の80％を超えると、
内筒の内周面に沿つて旋回する冷却水が異形棒鋼
に十分接触せず、従つて冷却不足が生じ、一方、
異形棒鋼の呼径の50％未満では、前述した従来技
術の欠点が改善されず、先端部付近のみの過冷却
が発生する。
第８図には、この発明方法により冷却を行なう
場合の設備の一例が示されている。図面におい
て、１５ａ，１５ｂ，１５ｃは圧延スタンド、１
４ａ，１４ｂ，１４ｃ，１４ｄ，１４ｅは、前記
圧延スタンド１５ａ〜１５ｃに続いて列設された
上述の冷却用筒体、１６は前記冷却用筒体１４ａ
〜１４ｅに冷却水を必要な水量および圧力により
供給するためのポンプ装置、１７は流量計、１８
は最終の冷却用筒体１４ｅに続いて設けられた、
異形棒鋼がもたらす冷却水の水切り機能を備えた
水切り兼誘導樋、１９は誘導樋、２０はピンチロ
ーラ、２１は温度計である。
冷却用筒体１４における内筒および外筒の径並
びに長さの一例を挙げると、次の通りである。
内筒径……被冷却材の直径＋（40〜80mm）
外筒径……内筒径＋（40〜60mm）
長さ ……500〜1000mm
また、内筒１０内に形成される中空部１３の径
は、冷却水噴射口１２の傾斜角度によつて変える
ことができる。第２表にその一例を示す。[Table] In Table 1 above, ○ indicates proper cooling, △ indicates slightly insufficient cooling, × indicates insufficient cooling, ● indicates slightly local supercooling, and ●● indicates local supercooling. Show each. In addition, FIG. 7 is a graph representing the relationship shown in Table 1 above, where X is the appropriate cooling area and Y is the appropriate cooling area.
indicates a supercooled region, and Z indicates an undercooled region.
As is clear from Table 1 and FIG. 7, when the diameter of the hollow portion 13 exceeds 80% of the nominal diameter of the deformed steel bar,
The cooling water swirling along the inner peripheral surface of the inner cylinder does not make sufficient contact with the deformed steel bar, resulting in insufficient cooling.
If the diameter of the deformed steel bar is less than 50%, the above-mentioned drawbacks of the prior art cannot be improved, and supercooling occurs only in the vicinity of the tip. FIG. 8 shows an example of equipment for cooling according to the method of this invention. In the drawing, 15a, 15b, 15c are rolling stands;
4a, 14b, 14c, 14d, 14e are the above-mentioned cooling cylinders arranged in a row following the rolling stands 15a to 15c, and 16 is the cooling cylinder 14a.
- 14e, a pump device for supplying cooling water at the required amount and pressure, 17 is a flow meter, 18
is provided following the final cooling cylinder 14e,
A deformed steel bar serves as a drainer and an induction gutter having a function of draining cooling water, 19 is an induction gutter, 20 is a pinch roller, and 21 is a thermometer. An example of the diameter and length of the inner cylinder and outer cylinder in the cooling cylinder 14 is as follows. Inner cylinder diameter: Diameter of cooled material + (40 to 80 mm) Outer cylinder diameter: Inner cylinder diameter + (40 to 60 mm) Length: 500 to 1000 mm Also, the hollow part 13 formed in the inner cylinder 10 The diameter of the cooling water injection port 12 can be changed depending on the inclination angle of the cooling water injection port 12. An example is shown in Table 2.
【表】
上述した設備において、第７図に示した矢印の
パスラインにより送りこまれた棒鋼材は、圧延ス
タンド１５ａ，１５ｂ，１５ｃによつて所定の径
に圧延された後、冷却用筒体１４ａ〜１４ｅから
なる水冷ゾーンにより均一に冷却が施され、水切
り兼誘導樋１８、誘導樋１９を経て、次の工程へ
と送られる。
上記した実施例においては、冷却用筒体１４は
５基設けられているが、この基数は、仕上圧延ス
ピード、棒鋼材の径、目標冷却温度等の条件によ
り定められる。下記第３表にその一例を示す。[Table] In the above-mentioned equipment, the steel bar fed along the pass line indicated by the arrow shown in FIG. It is uniformly cooled by a water cooling zone consisting of 14e and 14e, and is sent to the next process via a drainer/induction gutter 18 and an induction gutter 19. In the embodiment described above, five cooling cylinders 14 are provided, and the number of cooling cylinders 14 is determined by conditions such as the finish rolling speed, the diameter of the steel bar, and the target cooling temperature. An example is shown in Table 3 below.
【表】
なお、上記した複数基の冷却用筒体における冷
却水噴射口の傾斜方向を、各冷却用筒体によつて
変え、冷却水の旋回流の向きを冷却用筒体毎に正
逆交互に行なわせれば、異形棒鋼の横ふしが傾め
の場合やクロス状の場合に効果的である。
また、冷却水の旋回流が異形棒鋼の長さ方向に
形成された縦ふしに当たることにより、冷却水に
撹乱作用が生ずるため、この撹乱作用により、少
ない水量で効率的な冷却が可能となる効果もあ
る。
更に、内筒に設けられた冷却水噴射口の傾斜
を、内筒の法線に対して傾斜させると共に、内筒
の軸線方向に対しても傾斜させるときは、冷却水
に内筒の軸線に沿う中空部が形成された状態で、
螺旋状に旋回しつつ、上流側から下流側に向う流
れが生ずる。従つて、このような流れを、ノンフ
リクシヨンガイドあるいは移送手段としても利用
することができる。
以上詳述したように、この発明によれば、棒鋼
材を全長にわたり均等に冷却することができ、先
端部付近の過冷却による変形等が生ずることはな
く、また二次スケールも発生しないから、機械的
性質及び外観の優れた高品質の棒鋼が得られ、し
かも効率的に、高度な制御系等特別な設備も要せ
ず冷却が行なえる等、工業上優れた効果がもたら
される。[Table] Note that the direction of inclination of the cooling water injection ports in the plurality of cooling cylinders described above can be changed depending on each cooling cylinder, and the direction of the swirling flow of cooling water can be changed between forward and reverse directions for each cooling cylinder. If this is done alternately, it is effective when the horizontal beams of the deformed steel bar are inclined or cross-shaped. In addition, the swirling flow of cooling water hits the vertical slats formed in the length direction of the deformed steel bar, creating a disturbance effect on the cooling water.This disturbance effect enables efficient cooling with a small amount of water. There is also. Furthermore, when the inclination of the cooling water injection port provided in the inner cylinder is inclined with respect to the normal line of the inner cylinder and also with respect to the axial direction of the inner cylinder, it is necessary to With a hollow part along the line formed,
A flow is generated from the upstream side to the downstream side while spirally turning. Therefore, such a flow can also be used as a non-friction guide or a transport means. As detailed above, according to the present invention, the steel bar can be cooled uniformly over its entire length, deformation due to overcooling near the tip does not occur, and secondary scale does not occur. A high-quality steel bar with excellent mechanical properties and appearance can be obtained, and excellent industrial effects are brought about, such as efficient cooling without the need for special equipment such as a sophisticated control system.
第１図は従来の二重水冷筒式冷却装置を示す概
略正面図、第２図は同じくスプレーノズル式冷却
装置を示す概略正面図、第３図はこの発明に使用
される冷却装置の一例を示す長さ方向の断面図、
第４図は第３図Ａ―Ａ線断面図、第５図はこの発
明の冷却状態を示す説明図、第６図イ，ロはこの
発明における中空部の径と異形棒鋼の径との関係
を示す説明図、第７図は中空部の径と冷却効果の
関係を示す図、第８図はこの発明方法を実施する
場合の設備の一例を示す説明図である。図面にお
いて、
５…異形棒鋼材、９…外筒、１０…内筒、１１
…導入管、１２…冷却水噴射口、１３…中空部、
１４…冷却用筒体、１５…圧延スタンド、１６…
ポンプ装置、１７…流量計、１８…水切り兼誘導
樋、１９…誘導樋、２０…ピンチローラ、２１…
温度計。
Fig. 1 is a schematic front view showing a conventional double water cylinder type cooling device, Fig. 2 is a schematic front view showing a spray nozzle type cooling device, and Fig. 3 is an example of the cooling device used in the present invention. A longitudinal cross-sectional view showing,
Figure 4 is a sectional view taken along the line A-A in Figure 3, Figure 5 is an explanatory diagram showing the cooling state of this invention, and Figures 6 A and 6 are the relationship between the diameter of the hollow part and the diameter of the deformed steel bar in this invention. FIG. 7 is an explanatory diagram showing the relationship between the diameter of the hollow part and the cooling effect, and FIG. 8 is an explanatory diagram showing an example of equipment for carrying out the method of the present invention. In the drawings, 5... Deformed steel bar, 9... Outer cylinder, 10... Inner cylinder, 11
...Introduction pipe, 12...Cooling water injection port, 13...Hollow part,
14...Cylinder for cooling, 15...Rolling stand, 16...
Pump device, 17... Flow meter, 18... Drainer/induction gutter, 19... Induction gutter, 20... Pinch roller, 21...
thermometer.
Claims (1)
かつ前記筒体の軸線方向に所定間隔で配置された
多数の噴射口から噴射する冷却水により、前記筒
体内を通過する棒鋼材の冷却を行なう棒鋼材の冷
却方法において、 前記噴射口を、前記筒体の法線に対して所定角
度傾斜させて設け、前記噴射口から噴射される冷
却水をして、筒体の軸線に沿つて中空部を有する
旋回流を形成させると共に、前記中空部の径を少
なくとも棒鋼材の呼径より小となし、この中空部
に棒鋼材を通過させ、冷却水の旋回流によつて冷
却を行なうことを特徴とする棒鋼材の冷却方法。[Claims] 1. At a predetermined interval on the same circumference of the cooling cylinder,
and a method for cooling a steel bar passing through the cylinder by cooling water injected from a large number of injection ports arranged at predetermined intervals in the axial direction of the cylinder, wherein the injection ports are The cooling water injected from the injection port is provided to be inclined at a predetermined angle with respect to the normal line of the cylindrical body, and forms a swirling flow having a hollow portion along the axis of the cylindrical body. A method for cooling a steel bar, characterized in that the diameter is at least smaller than the nominal diameter of the steel bar, the steel bar is passed through this hollow part, and the steel bar is cooled by a swirling flow of cooling water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8998380A JPS5716124A (en) | 1980-07-03 | 1980-07-03 | Cooling of bar steel material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8998380A JPS5716124A (en) | 1980-07-03 | 1980-07-03 | Cooling of bar steel material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5716124A JPS5716124A (en) | 1982-01-27 |
| JPH0122326B2 true JPH0122326B2 (en) | 1989-04-26 |
Family
ID=13985887
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8998380A Granted JPS5716124A (en) | 1980-07-03 | 1980-07-03 | Cooling of bar steel material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5716124A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7926283B2 (en) * | 2009-02-26 | 2011-04-19 | General Electric Company | Gas turbine combustion system cooling arrangement |
| CN105436218B (en) * | 2014-08-29 | 2017-11-03 | 宝钢特钢有限公司 | A kind of cooling device for forming high density angular injection stream |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5541813Y2 (en) * | 1974-08-12 | 1980-09-30 |
-
1980
- 1980-07-03 JP JP8998380A patent/JPS5716124A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5716124A (en) | 1982-01-27 |
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