JPH10156417A - Slow cooling device for hot rolled wire - Google Patents

Slow cooling device for hot rolled wire

Info

Publication number
JPH10156417A
JPH10156417A JP31387396A JP31387396A JPH10156417A JP H10156417 A JPH10156417 A JP H10156417A JP 31387396 A JP31387396 A JP 31387396A JP 31387396 A JP31387396 A JP 31387396A JP H10156417 A JPH10156417 A JP H10156417A
Authority
JP
Japan
Prior art keywords
heater
coil
slow cooling
conveyor
wire
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
Application number
JP31387396A
Other languages
Japanese (ja)
Inventor
Masao Toyama
雅雄 外山
Mitsuru Moritaka
満 森高
Hiroyuki Tomiyama
浩行 富山
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kobe Steel Ltd
Original Assignee
Kobe Steel Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kobe Steel Ltd filed Critical Kobe Steel Ltd
Priority to JP31387396A priority Critical patent/JPH10156417A/en
Publication of JPH10156417A publication Critical patent/JPH10156417A/en
Pending legal-status Critical Current

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  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Abstract

PROBLEM TO BE SOLVED: To make the cooling rate in the sparse part of wires slower and to soften even thin wires by providing heater on the inside surface in the upper part of a slow cooling cover which is arranged above the sparse part of the thick layer wires on a conveyer and providing heat insulating bodies on the right and left of the heater. SOLUTION: The thick layer coil L is transported by the conveyer 9 in a cooling chamber 11A. On the inside surface in the upper part of the slow cooling cover 11, the heater 10 and the heat insulating material 13 on the right and left of the heater 10 are placed. In the upper part in the sparse part L1 of the coil L, i.e., the middle part in the width direction of the conveyer 9, the heater 10 is provided. The heater 10 and heat insulating body 13 does not project in the cooling chamber and made flush, so, even when the coil L is bounded during transportation, the coil is not brought into contact with the heater 10 and heat insulating body 13. The heater 10 is not provided over the entire width of the coil L, but in the range of 25-75% on both sides the sparse part L1 where layer density is lower in the middle part of the coil L. The wire having the diameter of 5.5mm is cooled at <=0.4 deg.C/sec and energy consumption is redused.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、熱間圧延線材の徐
冷装置に係り、より具体的には、機械構造用炭素鋼・合
金鋼、バネ鋼あるいは軸受鋼などの軟質化をオンライン
で実現するために、コンベア上の層厚コイルの冷却速度
の最大値(線材疎部に相当)を0.4℃/sec以下に
制御可能とした熱間圧延線材の徐冷装置に関するもので
ある。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for gradually cooling a hot-rolled wire rod, and more specifically, realizes on-line softening of carbon steel, alloy steel, spring steel or bearing steel for machine structural use. The present invention relates to an apparatus for gradually cooling a hot-rolled wire rod capable of controlling a maximum value of a cooling rate of a layer-thickness coil on a conveyor (corresponding to a sparse portion of a wire rod) to 0.4 ° C./sec or less.

【0002】[0002]

【従来の技術】熱間圧延後の線材を層厚コイル(水平に
拡げ伸ばした互いに相重なり合ったリング群の状態)に
形成してコンベア上に載置し、該層厚コイルをコンベア
にて移送する過程で線材の全長に亘ってほぼ均一に冷却
する技術として、特公昭56−28973号公報(従来
例の1)および特公昭59−52214号公報(従来例
の2)がそれぞれ提案されている。
2. Description of the Related Art A wire rod after hot rolling is formed into a layer-thick coil (a state of a group of rings which are horizontally extended and overlapped with each other), placed on a conveyor, and transferred by the conveyor. Japanese Patent Publication No. 56-28973 (conventional example 1) and Japanese Patent Publication No. 59-52214 (conventional example 2) have been proposed as techniques for cooling the wire substantially uniformly over the entire length of the wire rod. .

【0003】[0003]

【発明が解決しようとする課題】層厚コイルはコンベア
上においてコンベアの幅方向中央部に層疎部が形成さ
れ、コンベアの左右両端部に層密部が形成された形で移
送されることから、層疎部での冷却速度が層密部の冷却
速度よりも速くなり、これが要因となって均一な冷却が
できないという宿命がある。
The layer-thickness coil is transported on a conveyor in such a manner that a sparse portion is formed at the center in the width direction of the conveyor, and a dense layer is formed at both left and right ends of the conveyor. However, the cooling rate in the dense layer is higher than the cooling rate in the dense section, which causes a problem that uniform cooling is not possible.

【0004】この宿命を従来例の1では輻射エネルギー
を制御することによって解消しており、一方、従来例の
2では線材の保有熱を対流現象によって解消している。
しかしながら、従来例の1では、輻射制御帯(ガスチュ
ーブ、電気抵抗加熱体等)をコンベアの幅方向全体に亘
って設置し、線材の質量分布に略逆比例する強さの輻射
熱を付与して制御しているため、その制御が非常に難し
いし、理論上では均一徐冷が可能であっても実操業にお
いては徐冷のバラツキがあるし、また、エネルギーの無
駄があった。
In the first conventional example, this fate is eliminated by controlling the radiant energy, while in the second conventional example, the heat retained in the wire is eliminated by a convection phenomenon.
However, in the first conventional example, the radiation control zone (gas tube, electric resistance heating body, etc.) is installed over the entire width of the conveyor, and radiant heat having a strength substantially inversely proportional to the mass distribution of the wire is applied. Because of the control, it is very difficult to control it, and even though theoretically uniform slow cooling is possible, there are variations in slow cooling in actual operation, and there is waste of energy.

【0005】また、輻射制御帯(ガスチューブ等)は、
徐冷カバーの内面とは切り離されて所謂露呈状として設
置されており、これでは、層厚コイルの踊り(捲線機か
らコンベアに載置するとき、コンベア上の段差にてコイ
ルをほぐすときに踊りが発生し、この踊りが波及する)
が生じたとき、当該線材が輻射制御帯に接触するおそれ
があった。
The radiation control zone (gas tube etc.)
It is cut off from the inner surface of the slow cooling cover and installed as a so-called exposed state. Occurs and this dance spreads)
When this occurred, there was a risk that the wire contacted the radiation control zone.

【0006】この踊りによる線材接触を回避するには徐
冷カバーの高さを大きくし、輻射制御帯をコンベアより
上方上部に設置することで可能ではあるけれども、この
ような構成であると、設備コストが高くなるだけでな
く、メンテナンスも悪く、しかも、熱エネルギー消費量
が多くなるという課題があった。一方、従来例の2は、
線材の保有熱を対流させる或いは保有熱の対流現象を利
用したものであるが、この対流現象だけでは均一な徐冷
ができ難い、すなわち、層厚コイルにおける層密部の熱
放散が少ないことから、層厚コイルにほぐしを与える必
要があり、このほぐし付与のため、コンベアに段差をつ
ける必要があり設備が複雑になるとともに層厚コイルが
必要以上に踊り現象が発生し、雰囲気攪拌ファン等との
線材接触の危険性が大きくなるという課題があった。
Although it is possible to avoid the contact of the wire rod due to the dance by increasing the height of the slow cooling cover and installing the radiation control zone above the conveyor, it is possible with such a configuration to use the equipment. In addition to the increase in cost, there is a problem that maintenance is poor and heat energy consumption increases. On the other hand, 2 of the conventional example is
This method uses the convection of the retained heat of the wire or the convection of the retained heat.However, it is difficult to perform uniform slow cooling only by this convection phenomenon, that is, because the heat dissipation of the dense portion in the thick coil is small. It is necessary to give looseness to the layer thickness coil, and to provide this looseness, it is necessary to make a step on the conveyor, the equipment becomes complicated and the layer thickness coil dances more than necessary, and the atmosphere stirring fan etc. However, there is a problem that the risk of contact with the wire is increased.

【0007】そこで本発明は、従来例の1の輻射熱を利
用する徐冷技術を対象とし、加熱ヒータは層厚コイルの
全幅に亘って設置するのではなく、層厚コイルにおける
疎部と相対する位置に設置して、線径、コイルピッチ、
目標冷却速度に応じて加熱ヒータの幅方向の設定温度を
制御する(すなわち、線材の質量分布に一義的に逆比例
するかたちでの制御ではない)ことで線材疎部冷却速度
が比較的細いサイズのφ5.5mm線材でも0.4℃以
下に収まり、全サイズ(φ5.5mm以上)の軟質化が
可能な徐冷装置を提供するのである。
Therefore, the present invention is directed to a conventional slow cooling technique using radiant heat, in which the heater is not installed over the entire width of the layer-thickness coil, but is opposed to a sparse portion in the layer-thickness coil. Position, wire diameter, coil pitch,
By controlling the set temperature in the width direction of the heater in accordance with the target cooling rate (that is, the control is not directly in inverse proportion to the mass distribution of the wire), the cooling rate of the wire sparse portion is relatively small. The present invention provides a slow cooling device which can be kept at 0.4 ° C. or less even with the φ5.5 mm wire rod and can be softened to all sizes (φ5.5 mm or more).

【0008】[0008]

【課題を解決するための手段】本発明は、熱間圧延され
た線材を層厚コイルとして載置移送するコンベアと、加
熱ヒータを有していて前記層厚コイルの移送経路を包囲
する徐冷カバーと、を備え、熱間圧延された線材を引き
続き冷却する装置において、前述の目的を達成するため
に、次の技術的手段を講じている。
SUMMARY OF THE INVENTION The present invention provides a conveyor for placing and transferring a hot-rolled wire as a thick coil, and a slow cooling apparatus having a heater and surrounding a transfer path of the thick coil. And a cover for continuously cooling the hot-rolled wire rod, the following technical measures are taken in order to achieve the above-mentioned object.

【0009】すなわち、本発明は、コンベア上の層厚コ
イルにおける疎部に相対する徐冷カバーの上部内面に前
記加熱ヒータを設け、該加熱ヒータの左右における徐冷
カバーの上部内面に断熱体を設けていることを特徴とす
るものであり、このような構成を採用することによっ
て、機械構造用炭素鋼・合金鋼、バネ鋼あるいは軸受鋼
などの軟質化をオンラインで実現するため、コンベア上
における層厚コイルの冷却速度の最大値(線材疎部に相
当)を0.4℃/sec以下に制御することが可能とな
ったのである。
That is, according to the present invention, the heater is provided on the upper inner surface of the slow cooling cover facing the sparse portion of the layer thickness coil on the conveyor, and the heat insulator is provided on the upper inner surface of the slow cooling cover on the left and right sides of the heater. By adopting such a configuration, the softening of carbon steel, alloy steel, spring steel or bearing steel for machine structures is realized online, This makes it possible to control the maximum value of the cooling rate of the layer thickness coil (corresponding to the sparse portion of the wire) to 0.4 ° C./sec or less.

【0010】また、線径、コイルピッチ、目標冷却速度
に応じて加熱ヒータのコンベア幅方向の設定温度を制御
可能とし、必ずしも線材の質量分布に逆比較した制御で
はないことから、その制御も容易であるし、輻射エネル
ギー(消費エネルギー)の無駄も少なく、また、複雑な
設備機械は必要なく、しかも、従来例の1のように輻射
制御帯がカバー内に露呈状に設置されていないためコン
ベア上で層厚コイルが踊ったとしても加熱ヒータとの接
触もなくなって、実操業に適合した徐冷装置を提供でき
るのである。
Further, the set temperature of the heater in the width direction of the conveyor can be controlled in accordance with the wire diameter, the coil pitch, and the target cooling rate, and the control is not necessarily inversely compared to the mass distribution of the wire. In addition, there is little waste of radiant energy (consumed energy), no complicated equipment is required, and the radiation control zone is not installed in the cover in an exposed manner as in the first conventional example. Even if the layer thickness coil dances above, there is no contact with the heater, and a slow cooling device suitable for actual operation can be provided.

【0011】更に、層厚コイルにおける疎部を中心にし
てコイル径の25%〜75%の範囲で加熱ヒータが設置
されていることにより、また、コンベアの幅方向で個別
に温度制御可能として加熱ヒータが設置されていること
によって、加熱ヒータの制御温度範囲を600℃〜90
0℃に設定可能で線材疎部の冷却速度の調節ができるの
である。
Further, since the heater is provided within a range of 25% to 75% of the coil diameter centering on the sparse portion of the layer thickness coil, the temperature can be individually controlled in the width direction of the conveyor. Since the heater is installed, the control temperature range of the heater is set to 600 ° C. to 90 ° C.
The temperature can be set to 0 ° C., and the cooling rate of the wire sparse portion can be adjusted.

【0012】[0012]

【発明の実施の形態】以下、図を参照して本発明の実施
の形態を説明すると、全体設備のレイアウトを示してい
る図2(A)において、加熱炉1、保熱炉2、粗列圧延
機3、第1・2中間列圧延機4,5および仕上圧延機6
をそれぞれ経由して本発明の対象である熱間圧延線材の
徐冷装置7が備えられており、該徐冷装置7は図2
(B)で示す層厚コイル(水平に拡げ伸ばした互いに相
重なり合ったリング群の状態)、すなわち、層疎部L1
と層密部L2を形成した層厚コイルLを緩速冷却するも
のである。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 2A showing the layout of the entire facility, a heating furnace 1, a heat retention furnace 2, a coarse row Rolling mill 3, first and second intermediate row rolling mills 4, 5 and finishing mill 6
Is provided with an annealing device 7 for hot-rolled wire which is the object of the present invention via
The layer-thickness coil shown in (B) (the state of the mutually overlapping ring groups extended horizontally), that is, the layer-sparse portion L1
And the layer-thickness coil L on which the layer dense portion L2 is formed is slowly cooled.

【0013】図1(A)(B)を参照すると、熱間圧延
された線材を捲線機8によって層厚コイルLに形成して
移動しつつあるコンベア9に載置し、加熱ヒータ10を
有していて前記層厚コイルLの移送経路を包囲する、す
なわち、冷却室11Aを形成している徐冷カバー11と
で構成されていて、移送終端には軟質化された線材の集
束装置12が備えられている。
Referring to FIGS. 1A and 1B, a hot-rolled wire is formed into a thick coil L by a winding machine 8, placed on a moving conveyor 9, and provided with a heater 10. And a slow cooling cover 11 surrounding a transfer path of the layer thickness coil L, that is, a cooling chamber 11A forming a cooling chamber 11A. Provided.

【0014】層厚コイルLを載置移送するコンベア9
は、本実施形態ではローラコンベアとされており、徐冷
カバー(保熱カバー)11の上部内面には加熱ヒータ1
0とこの左右に断熱材13が載置されている。加熱ヒー
タ10は、例えば電気抵抗加熱ヒータであって、コンベ
ア9上の層厚コイルLにおける疎部L1すなわち、コン
ベア9の幅方向中央部位と相対する上部内面に設置され
ており、この加熱ヒータ10の左右の上部内面に断熱体
13が設置され、加熱ヒータ10と断熱体13は冷却室
11Aに突出してなくて面一に形成され、ここに、層厚
コイルLが移送中に踊ったとしても接触しないようにさ
れている。
Conveyor 9 for placing and transferring the layer thickness coil L
Is a roller conveyor in the present embodiment, and a heater 1
The heat insulating material 13 is placed on the right and left sides of the heat insulating material 13. The heater 10 is, for example, an electric resistance heater, and is installed on a sparse portion L1 of the layer-thickness coil L on the conveyor 9, that is, on the upper inner surface facing the central portion in the width direction of the conveyor 9. A heat insulator 13 is installed on the upper inner surface on the left and right sides of the heater, and the heater 10 and the heat insulator 13 are formed flush with each other without protruding into the cooling chamber 11A. Even if the layer-thickness coil L dances during the transfer, Avoid contact.

【0015】更に、加熱ヒータ10は、コンベア9の幅
方向で個別に温度制御可能とすべく中央部位10A、左
右両側部位10B,10Cに分割されており、600℃
〜900℃の温度範囲で層疎部L1の冷却速度の調節が
可能であり、層疎部L1を中心にしたコイル径の25%
〜75%の範囲で徐冷カバー11の上部内面に設置され
ている。
Further, the heater 10 is divided into a central portion 10A and left and right portions 10B and 10C so that the temperature can be individually controlled in the width direction of the conveyor 9.
The cooling rate of the layer-sparse portion L1 can be adjusted in a temperature range of up to 900 ° C., and 25% of the coil diameter centered on the layer-sparse portion L1.
It is installed on the upper inner surface of the slow cooling cover 11 in a range of up to 75%.

【0016】すなわち、加熱ヒータ10は、層厚コイル
Lの全幅に亘って設置するのではなく、コイル中央部の
最も層密度の低い疎部を中心として25%〜75%の範
囲に設置することで600℃〜900℃の温度制御が容
易でかつ無駄なエネルギーも少なくできるのであって、
線径、コイルピッチ、目標冷却速度に応じての、つま
り、必ずしも線材の質量分布に一義的に逆比例したかた
ちでの制御を必要としないのである。
That is, the heater 10 is not installed over the entire width of the layer thickness coil L, but is installed in a range of 25% to 75% around a sparse portion having the lowest layer density at the center of the coil. It is easy to control the temperature of 600 ° C to 900 ° C and can reduce wasteful energy.
It is not necessary to control according to the wire diameter, the coil pitch, and the target cooling rate, that is, in a manner that is not necessarily in inverse proportion to the mass distribution of the wire.

【0017】ここで、加熱ヒータ10の温度範囲を60
0℃〜900℃としたのは、捲線機8によって、層厚コ
イルLに形成されコンベア9上に載置された線材温度は
750℃〜800℃であり、コンベア9で移送中(例え
ば移送速度10〜15m/分)の層厚コイルLは保有熱
の放熱があり、この放熱が疎部では激しいことから60
0℃以下であると徐冷の効果はないし、900℃以上で
は実用的でないからである。
Here, the temperature range of the heater 10 is set to 60
The reason why the temperature is set to 0 ° C. to 900 ° C. is that the temperature of the wire rod formed in the layer thickness coil L by the winding machine 8 and placed on the conveyor 9 is 750 ° C. to 800 ° C. The coil L having a layer thickness of 10 to 15 m / min has a heat radiation of the retained heat, and since the heat radiation is intense in the sparse portion, the coil L has a thickness of 60 mm.
If the temperature is 0 ° C. or lower, the effect of slow cooling is not obtained, and if the temperature is 900 ° C. or higher, it is not practical.

【0018】また、加熱ヒータ10としては、電気抵抗
加熱ヒータを採用することによって、ガスヒータ等に比
べてメンテナンスが容易となるし、該ヒータ10として
の形式は、面状ヒータ(パネルヒータ)でもシーズヒー
タであっても構わない。更に、断熱体13としては、以
下のような種類が採用できる。粉末・粒子状断熱材(パ
ーライト,珪藻土,アルミナ粉末,カーボンバルンな
ど),繊維・片状断熱材(石綿,裁断した紙など),固
体断熱材(泡ガラス,発泡コンクリート,発泡スチレ
ン,発泡ウレタンなど),綿状断熱材(ガラス繊維,シ
リカ・アルミナ繊維,綿など),層状断熱材(複層板ガ
ラスなど),構造断熱材(蜂の巣構造,段ボール紙な
ど),複合断熱材(断熱キャスタブルなど),粉末・粒
子添加して成形したものが望ましい。
Further, by adopting an electric resistance heater as the heater 10, maintenance becomes easier as compared with a gas heater or the like. It may be a heater. Further, the following types can be adopted as the heat insulator 13. Powder and particulate insulation (pearlite, diatomaceous earth, alumina powder, carbon balun, etc.), fiber and flake insulation (asbestos, cut paper, etc.), solid insulation (foam glass, expanded concrete, expanded styrene, expanded urethane, etc.) ), Cotton-like insulation (glass fiber, silica / alumina fiber, cotton, etc.), layered insulation (double-layered glass, etc.), structural insulation (honeycomb structure, corrugated cardboard, etc.), composite insulation (insulation castable, etc.), It is desirable that the powder and particles are added and molded.

【0019】また、ガラスウールとステンレス板等のシ
ールド板とを交互に積層したサンドイッチ構造の断熱体
などを利用しても良い。なお、本発明の実施の形態は以
上の通りであるが徐冷カバー11については、これを開
閉自在にしたり、摺動自在として、コンベア9上を開放
し、高速(急速)冷却にも容易に切り換えるようにして
も良い。
Further, a heat insulator having a sandwich structure in which glass wool and a shield plate such as a stainless steel plate are alternately laminated may be used. Although the embodiment of the present invention is as described above, the slow cooling cover 11 can be opened and closed or slidable to open the conveyor 9 so that it can be easily cooled at high speed (rapid). Switching may be performed.

【0020】また、層密部の冷却速度を早めるために、
コイル両側の徐冷カバーの部分に局部的に対流を生じさ
せる空気流通部を形成することもできるし、冷却速度の
早い疎部の変態終了時点からコンベアの移動速度を速め
てコイルピッチを広げて層密部の冷却速度をアップして
処理時間を短縮することもできる。 実施例1 JIS SCM435の155角ピレットを8φに圧延
し、ローラコンベア上に載置した後、750℃から徐冷
カバーで覆われた状態で500sec保持し、その後コ
イル状に巻き取りを行った。徐冷カバーには中央部にリ
ング径の0.7倍幅のヒータを取付け表面温度を750
℃に制御した。圧延後コイルから14リングを採取し、
1リング当たり16分割したサンプルで引張試験を行う
ことにより圧延材の機械的性質を評価した。最大引張強
度77kg/mm2 、最小引張強度69kg/mm2
平均引張強度73kg/mm2 であり、熱処理を施さず
冷間加工ができる強度に軟化させることができた。 実施例2 JIS SCM435の155角ピレットを8φに圧延
し、ローラコンベア上に載置した後、750℃から徐冷
カバーで覆われた状態で500sec保持し、その後コ
イル状に巻き取りを行った。徐冷カバーには中央部にリ
ング径の0.5倍幅のヒータを取付け表面温度を800
℃に制御した。圧延後コイルから14リングを採取し、
1リング当たり16分割したサンプルで引張試験を行う
ことにより圧延材の機械的性質を評価した。最大引張強
度76kg/mm2 、最小引張強度68kg/mm2
平均引張強度72kg/mm2 であり、熱処理を施さず
冷間加工ができる強度に軟化させることができた。 実施例1 JIS SCM435の155角ピレットを8φに圧延
し、ローラコンベア上に載置した後、750℃から通常
の徐冷カバーで覆われた状態で500sec保持し、そ
の後コイル状に巻き取りを行った。圧延後コイルから1
4リングを採取し、1リング当たり16分割したサンプ
ルで引張試験を行うことにより圧延材の機械的性質を評
価した。最大引張強度99kg/mm2 、最小引張強度
72kg/mm2 、平均引張強度82kg/mm2 であ
り、最大引張強度が大きくなり充分な軟化が達成できな
い。 実施例2 JIS SCM435の155角ピレットを8φに圧延
し、ローラコンベア上に載置した後、750℃から徐冷
カバーで覆われた状態で500sec保持し、その後コ
イル状に巻き取りを行った。徐冷カバーには中央部にリ
ング径幅のヒータを取付け表面温度を750℃に制御し
た。圧延後コイルから12リングを採取し、1リング当
たり16分割したサンプルで引張試験を行うことにより
圧延材の機械的性質を評価した。最大引張強度95kg
/mm2 、最小引張強度68kg/mm2 、平均引張強
度74kg/mm2 であり、最大引張強度が大きくなり
充分な軟化が達成できない。これは徐冷カバー下のコイ
ル密部の冷却速度がカバーに取り付けられたヒータから
の輻射熱により遅くなりすぎ500sec保持では変態
終了まで達せず、その後の冷却速度が大きくなった時点
で変態するためである。
Further, in order to increase the cooling speed of the dense portion,
It is also possible to form an air circulation part that causes convection locally in the part of the slow cooling cover on both sides of the coil, and to increase the coil pitch by increasing the moving speed of the conveyor from the end of the transformation of the sparse part with a high cooling rate The processing time can be shortened by increasing the cooling rate of the dense portion. Example 1 A 155 square pillet of JIS SCM435 was rolled to 8φ, placed on a roller conveyor, held at 750 ° C. while being covered with a slow cooling cover for 500 seconds, and then wound into a coil. A heater having a width 0.7 times the ring diameter is attached to the center of the slow cooling cover, and the surface temperature is set to 750.
C. was controlled. After rolling, collect 14 rings from the coil,
The mechanical properties of the rolled material were evaluated by conducting a tensile test on samples divided into 16 pieces per ring. Maximum tensile strength 77 kg / mm 2 , minimum tensile strength 69 kg / mm 2 ,
The average tensile strength was 73 kg / mm 2 , and could be softened to a strength that allows cold working without heat treatment. Example 2 A 155 square pillaret of JIS SCM435 was rolled to 8φ, placed on a roller conveyor, held at 750 ° C. for 500 seconds while being covered with a slow cooling cover, and then wound into a coil. At the center of the slow cooling cover, a heater 0.5 times wider than the ring diameter is attached, and the surface temperature is set to 800
C. was controlled. After rolling, collect 14 rings from the coil,
The mechanical properties of the rolled material were evaluated by conducting a tensile test on samples divided into 16 pieces per ring. Maximum tensile strength 76 kg / mm 2 , minimum tensile strength 68 kg / mm 2 ,
The average tensile strength was 72 kg / mm 2 , and the material could be softened to a strength that allows cold working without heat treatment. Example 1 A 155 square pillet of JIS SCM435 was rolled to 8φ, placed on a roller conveyor, kept at 750 ° C for 500 seconds while being covered with a normal slow cooling cover, and then wound into a coil. Was. 1 from coil after rolling
The mechanical properties of the rolled material were evaluated by taking four rings and performing a tensile test on samples divided into 16 pieces per ring. The maximum tensile strength is 99 kg / mm 2 , the minimum tensile strength is 72 kg / mm 2 , and the average tensile strength is 82 kg / mm 2 . Example 2 A 155 square pillaret of JIS SCM435 was rolled to 8φ, placed on a roller conveyor, held at 750 ° C. while being covered with a slow cooling cover for 500 seconds, and then wound into a coil. A heater having a ring diameter was attached to the center of the slow cooling cover to control the surface temperature to 750 ° C. After rolling, 12 rings were collected from the coil, and a tensile test was performed on a sample obtained by dividing the ring into 16 rings to evaluate the mechanical properties of the rolled material. Maximum tensile strength 95kg
/ Mm 2 , the minimum tensile strength is 68 kg / mm 2 , and the average tensile strength is 74 kg / mm 2 , and the maximum tensile strength is so large that sufficient softening cannot be achieved. This is because the cooling rate of the coil dense portion under the slow cooling cover becomes too slow due to the radiant heat from the heater attached to the cover and does not reach the end of the transformation at 500 sec. is there.

【0021】[0021]

【発明の効果】以上詳述した通り、線材疎部冷却速度が
対象最小径の5.5mmφ線材でも0.4℃/sec以
下の緩速冷却ができ、5.5mmφ以上の熱間圧延線材
の軟質化が可能であり、温度制御の容易正確さ及びエネ
ルギーの無駄をなくし、線材接触によるトラブルも少な
くできる。
As described above in detail, even when the cooling rate of the sparse portion of the wire rod is 5.5 mmφ, which is the target minimum diameter, slow cooling of 0.4 ° C./sec or less can be achieved. Softening is possible, temperature accuracy is easily controlled, energy is not wasted, and troubles due to wire contact can be reduced.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の実施の形態を示し、(A)は概略側面
図、(B)は拡大断面図である。
FIG. 1 shows an embodiment of the present invention, in which (A) is a schematic side view and (B) is an enlarged sectional view.

【図2】本発明の実施の形態を示し、(A)は全体レイ
アウトを示し、(B)は対象コイル材の平面図である。
FIGS. 2A and 2B show an embodiment of the present invention, in which FIG. 2A is an overall layout, and FIG. 2B is a plan view of a target coil material.

【符号の説明】[Explanation of symbols]

9 コンベア 10 加熱ヒータ 11 徐冷カバー 13 断熱体 L 層厚コイル 9 Conveyor 10 Heater 11 Slow cooling cover 13 Heat insulator L Layer thickness coil

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 熱間圧延された線材を層厚コイルとして
載置移送するコンベアと、加熱ヒータを有していて前記
層厚コイルの移送経路を包囲する徐冷カバーと、を備
え、熱間圧延された線材を引き続き冷却する装置におい
て、 コンベア上の層厚コイルにおける疎部に相対する徐冷カ
バーの上部内面に前記加熱ヒータを設け、該加熱ヒータ
の左右における徐冷カバーの上部内面に断熱体を設けて
いることを特徴とする熱間圧延線材の徐冷装置。
1. A conveyer for placing and transferring a hot-rolled wire as a layer thickness coil, and a slow cooling cover having a heater and surrounding a path of the layer thickness coil. In the apparatus for continuously cooling the rolled wire rod, the heater is provided on the upper inner surface of the slow cooling cover opposed to the sparse portion in the layer thickness coil on the conveyor, and the upper inner surface of the slow cooling cover on the left and right sides of the heater is insulated. An apparatus for slowly cooling a hot-rolled wire, comprising a body.
【請求項2】 層厚コイルにおける疎部を中心にしてコ
イル径の25%〜75%の範囲で加熱ヒータが設置され
ていることを特徴とする請求項1記載の熱間圧延線材の
徐冷装置。
2. The gradual cooling of a hot-rolled wire according to claim 1, wherein a heater is provided in a range of 25% to 75% of the coil diameter centering on a sparse portion of the layer thickness coil. apparatus.
【請求項3】 コンベアの幅方向で個別に温度制御可能
として加熱ヒータが設置されていることを特徴とする請
求項1又は2に記載の熱間圧延線材の徐冷装置。
3. An apparatus according to claim 1, wherein a heater is provided so that the temperature can be individually controlled in the width direction of the conveyor.
JP31387396A 1996-11-25 1996-11-25 Slow cooling device for hot rolled wire Pending JPH10156417A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP31387396A JPH10156417A (en) 1996-11-25 1996-11-25 Slow cooling device for hot rolled wire

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP31387396A JPH10156417A (en) 1996-11-25 1996-11-25 Slow cooling device for hot rolled wire

Publications (1)

Publication Number Publication Date
JPH10156417A true JPH10156417A (en) 1998-06-16

Family

ID=18046540

Family Applications (1)

Application Number Title Priority Date Filing Date
JP31387396A Pending JPH10156417A (en) 1996-11-25 1996-11-25 Slow cooling device for hot rolled wire

Country Status (1)

Country Link
JP (1) JPH10156417A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020051081A (en) * 2000-12-22 2002-06-28 이구택 System for cooling hot rolled wire and method thereof
KR100690055B1 (en) 2006-04-04 2007-03-08 제일산기 주식회사 Automatic apparatus for transferring and cooling of billets
KR101182045B1 (en) * 2004-12-27 2012-09-11 주식회사 포스코 Thermo-instrument for controlling the cooling rate of the hot coil and the control method thereof
WO2020080614A1 (en) * 2018-10-18 2020-04-23 주식회사 포스코 Heat keeping apparatus for rolling and control method thereof

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020051081A (en) * 2000-12-22 2002-06-28 이구택 System for cooling hot rolled wire and method thereof
KR101182045B1 (en) * 2004-12-27 2012-09-11 주식회사 포스코 Thermo-instrument for controlling the cooling rate of the hot coil and the control method thereof
KR100690055B1 (en) 2006-04-04 2007-03-08 제일산기 주식회사 Automatic apparatus for transferring and cooling of billets
WO2020080614A1 (en) * 2018-10-18 2020-04-23 주식회사 포스코 Heat keeping apparatus for rolling and control method thereof

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