JPH10180350A - Open tube edge part pre-heating device - Google Patents
Open tube edge part pre-heating deviceInfo
- Publication number
- JPH10180350A JPH10180350A JP8339432A JP33943296A JPH10180350A JP H10180350 A JPH10180350 A JP H10180350A JP 8339432 A JP8339432 A JP 8339432A JP 33943296 A JP33943296 A JP 33943296A JP H10180350 A JPH10180350 A JP H10180350A
- Authority
- JP
- Japan
- Prior art keywords
- inductor
- open
- pipe
- open tube
- induction coil
- 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
Landscapes
- Pressure Welding/Diffusion-Bonding (AREA)
- General Induction Heating (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、オープン管エッジ
部予熱装置に関し、詳しくは、両エッジ部を衝合接合さ
れ鋼管となるオープン管のエッジ部を予熱するための装
置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for preheating an edge portion of an open pipe, and more particularly, to an apparatus for preheating an edge portion of an open pipe formed by joining both edges by abutment to form a steel pipe.
【０００２】[0002]
【従来の技術】溶接鋼管は、鋼板または鋼帯を管状に成
形しその継目を溶接したもので、小径から大径まで各種
の製造法によりつくられているが、主な製造法として、
電気抵抗溶接（電縫）、鍛接、電弧溶接によるものが挙
げられる。小径〜中径鋼管用としては、高周波誘導加熱
を利用した電気抵抗溶接法（電気抵抗溶接鋼管、電縫
管）が主として利用されている。この方法は、連続的に
帯鋼を供給し、成形ロールで管状に成形してオープン管
とし、続いて高周波誘導加熱によりオープン管の両エッ
ジ部端面を鋼の融点以上に加熱した後、スクイズロール
で両エッジ部端面を衝合溶接して鋼管を製造する方法で
ある（例えば、第３版鉄鋼便覧第III 巻（２）1056〜10
92頁）。2. Description of the Related Art Welded steel pipes are formed by forming a steel plate or a steel strip into a tube and welding the seams thereof, and are made by various manufacturing methods from a small diameter to a large diameter.
Examples include electric resistance welding (electric resistance welding), forge welding, and electric arc welding. For small to medium diameter steel pipes, an electric resistance welding method (electric resistance welded steel pipe, electric resistance welded pipe) utilizing high frequency induction heating is mainly used. In this method, a steel strip is continuously supplied, formed into a tubular shape with a forming roll to form an open pipe, and then the end faces of both edges of the open pipe are heated by high-frequency induction heating to a temperature equal to or higher than the melting point of the steel. (See, for example, the third edition of the Iron and Steel Handbook, Vol. III (2), 1056-10).
92).
【０００３】上記した高周波誘導加熱を利用した電縫管
の製造方法では、オープン管の両エッジ部端面を鋼の融
点以上に加熱するため、電磁力の影響により溶鋼が流動
し、生成された酸化物が衝合溶接部に噛み込まれペネト
レータ等の溶接欠陥あるいは、溶鋼飛散（フラッシュ）
が発生しやすいという問題があった。この問題に対し、
例えば、特開平2-299782号公報には、２つの加熱装置を
有する電縫鋼管の製造法が提案されている。すなわち、
第１の加熱装置でオープン管の両エッジ部の温度をキュ
リー点以上に加熱し、第２の加熱装置で更に融点以上に
加熱し、スクイズロールで両エッジ部を衝合溶接して鋼
管を製造する。また、特開平2-299783号公報には、第１
の加熱装置で周波数45〜250kHzの電流を流し、両側エッ
ジ部を予熱し、第２の加熱装置で更に融点以上に加熱
し、スクイズロールで両エッジ部を衝合溶接して鋼管を
製造する電縫管製造装置が提案されている。In the above-described method of manufacturing an electric resistance welded tube utilizing high frequency induction heating, since the end surfaces of both edges of the open tube are heated to the melting point of the steel or higher, the molten steel flows under the influence of electromagnetic force, and the generated oxidation occurs. An object is caught in the abutment weld and welding defects such as penetrators or molten steel scatter (flash)
There is a problem that is easy to occur. For this issue,
For example, Japanese Patent Application Laid-Open No. 2-299782 proposes a method for manufacturing an electric resistance welded steel pipe having two heating devices. That is,
The temperature of both edges of the open pipe is heated to the Curie point or higher by the first heating device, the temperature is further raised to the melting point by the second heating device, and the both edges are impact-welded with a squeeze roll to produce a steel pipe. I do. In addition, Japanese Patent Application Laid-Open No. 2-29983 discloses the first
A current having a frequency of 45 to 250 kHz is passed by the heating device, and both edges are preheated. The second heating device is further heated to a temperature equal to or higher than the melting point, and both edges are impact-welded with a squeeze roll to produce a steel pipe. A sewing tube manufacturing device has been proposed.
【０００４】しかしながら、これらの電縫管製造技術で
は、エッジ部を均一に加熱することは示唆しているもの
の、両エッジ部を鋼の融点以上に加熱するため、衝合溶
接時に、溶融した鋼が管の内外面に排出されビード（余
盛）が形成される。そのため、衝合溶接後に管内外面の
溶接ビードの除去が必要であり、ほとんどがビード切削
用バイトにより切削されて除去されている。[0004] However, although these electric resistance welded pipe manufacturing techniques suggest that the edges are uniformly heated, since both edges are heated to the melting point of the steel or higher, the molten steel is hardened at the time of impact welding. Is discharged to the inner and outer surfaces of the tube to form a bead. Therefore, it is necessary to remove the weld bead on the inner and outer surfaces of the pipe after the impact welding, and most of the bead is removed by cutting with a bead cutting tool.
【０００５】このようなことから、この方法では、 ビード切削用バイトの切削量の調整で、材料と時間の
ロスが発生する。 ビード切削用バイトは消耗品であるため、造管速度に
よって異なるが、3000〜4000ｍのビード切削長毎にバイ
トを交換する必要があり、そのため、１時間程度ごとに
３〜５分間のバイト交換のためのラインの停止を余儀な
くされる。[0005] For this reason, in this method, loss of material and time occurs due to adjustment of the cutting amount of the bead cutting tool. Since the bead cutting tool is a consumable, it needs to be changed every 3000-4000m bead cutting length, depending on the pipe forming speed. Therefore, it is necessary to change the bite for 3-5 minutes every hour. Forced to stop the line.
【０００６】特に造管速度が100 ｍ／min を超える高
速造管では、ビード切削用バイトの寿命が短く、交換頻
度が高い。など、ビード切削がネックとなり、高速造管
ができないため生産性が低いという問題があった。一
方、比較的小径鋼管用として極めて高い生産性を有する
鍛接鋼管製造方法がある。この方法は、連続的に供給し
た帯鋼を加熱炉で1300℃程度に加熱した後、成形ロール
で管状に成形してオープン管とし、続いてオープン管の
両エッジ部に高圧空気を吹き付けて端面のスケールオフ
を行った後、ウェルディングホーンにより端面に酸素を
吹き付け、その酸化熱で端面を1400℃程度に昇温させて
から、鍛接ロールで両エッジ部端面を衝合させ固相接合
して鋼管を製造する方法である（例えば、第３版鉄鋼便
覧第III 巻（２）1056〜1092頁）。In particular, in high-speed pipe forming in which the pipe forming speed exceeds 100 m / min, the life of the bead cutting tool is short and the frequency of replacement is high. There was a problem that bead cutting became a bottleneck and high-speed pipe making was not possible, resulting in low productivity. On the other hand, there is a method for producing a forged steel pipe having extremely high productivity for a relatively small diameter steel pipe. In this method, a continuously supplied steel strip is heated to about 1300 ° C in a heating furnace, and then formed into a tubular shape with a forming roll to form an open pipe. After performing the scale-off, oxygen is blown to the end face by the welding horn, and the end face is heated to about 1400 ° C. by the heat of oxidation, and then the end faces of both edges are abutted by a forging roll to perform solid-state joining. This is a method for producing a steel pipe (for example, Third Edition Iron and Steel Handbook, Vol. III (2), pp. 1056-1092).
【０００７】しかし、この鍛接鋼管製造方法では、 端面のスケールオフが完全ではないので、鍛接衝合部
へのスケール噛込みが発生し、シーム部の強度が母材部
に比べてかなり劣る。このため、偏平試験で、電縫鋼管
なら偏平高さ比ｈ／Ｄ＝２ｔ／Ｄ（ｔ：板厚）を達成で
きるのに対し、鍛接鋼管では偏平高さ比ｈ／Ｄが0.5 程
度に劣るものとなる。However, in this method for producing a forged steel pipe, the scale-off of the end face is not perfect, so that the scale is caught in the forged joint portion, and the strength of the seam portion is considerably inferior to that of the base material portion. For this reason, in the flattening test, the flattened height ratio h / D = 2t / D (t: plate thickness) can be achieved with an ERW steel pipe, while the flattened height ratio h / D is inferior to about 0.5 with a forged steel pipe. It will be.
【０００８】帯鋼を高温に加熱するため、管表面にス
ケールが生成し表面肌が悪い。など、造管速度が300m／
min 以上と速く生産性は高いが、シーム品質及び表面肌
が悪く、ＪＩＳのＳＴＫ等の強度信頼性や表面品質を要
求されるものは製造できないという問題があった。上記
問題を有利に解決するには、本発明者らの創案になる固
相圧接造管法によるのが好適である。これは、オープン
管の端部を融点未満の固相圧接適正温度域（1300℃〜15
00℃）に誘導加熱して圧接するという従来にない造管法
である。この固相圧接造管法で製造される鋼管は、従来
の溶接管のようにビード切削の必要がないので高速造管
が可能で生産性が高く、しかも従来の鍛接管の欠点であ
る酸化起因のシーム品質および表面肌の劣化もない。[0008] Since the steel strip is heated to a high temperature, scale is formed on the pipe surface, and the surface skin is poor. The pipe making speed is 300m /
Although the productivity is high as short as min or more, the seam quality and the surface skin are poor, and there is a problem that products requiring strength reliability and surface quality such as JIS STK cannot be manufactured. In order to advantageously solve the above problem, it is preferable to use a solid-state pressure welding tube method invented by the present inventors. This is because the end of the open tube is in the proper solid-state pressure welding temperature range below the melting point (1300 ° C to 15 ° C).
It is an unconventional tube-forming method in which induction heating is performed at a temperature of (00 ° C.) and pressure welding is performed. Unlike conventional welded pipes, steel pipes manufactured by this solid-state pressure welding method do not require bead cutting, so high-speed pipe forming is possible and productivity is high. No deterioration of seam quality and surface skin.
【０００９】ところが、従来の溶接管製造に使用されて
いる誘導加熱装置および抵抗加熱装置では、以下に述べ
る欠点があって、固相圧接造管法に適用するには問題が
ある。図９（ａ）、（ｂ）はそれぞれ、一般的な誘導加
熱装置、抵抗加熱装置の概念を示す斜視図である。図９
において、１はオープン管、２は鋼管、３はエッジ部、
４は接合点、５はシーム部、６はワークコイル、16、16
Ａはコンタクトチップ、７は接合電流経路、８は通材の
向きである。なお、図９では相対するエッジ部３の端面
を衝合して接合点４を形成する常用のスクイズロール、
およびワークコイル６あるいはコンタクトチップ16、16
Ａの両極に高周波電圧を印加する常用の高周波電源は図
示省略する。なお、接合電流経路７中の矢印はある時点
での電流の向きを示しており、無論、時間とともにこの
向きは交互に逆転する。However, the induction heating apparatus and the resistance heating apparatus used in the conventional production of welded pipes have the following drawbacks, and have problems in applying them to the solid-state pressure welding pipe method. FIGS. 9A and 9B are perspective views showing the concepts of a general induction heating device and a general resistance heating device, respectively. FIG.
, 1 is an open pipe, 2 is a steel pipe, 3 is an edge portion,
4 is a joint point, 5 is a seam part, 6 is a work coil, 16, 16
A is a contact chip, 7 is a junction current path, and 8 is a direction of a passing material. In FIG. 9, a conventional squeeze roll that forms the joining point 4 by abutting the end faces of the opposed edge portions 3,
And work coil 6 or contact tips 16, 16
A common high-frequency power supply for applying a high-frequency voltage to both poles of A is not shown. Note that the arrow in the junction current path 7 indicates the direction of the current at a certain point in time, and of course, this direction is alternately reversed with time.
【００１０】以下は、図９（ａ）に示す従来の誘導加熱
装置で代表して高周波電流を用いる加熱方法について述
べる。本装置では、ワークコイル６とよばれる複数巻き
のコイルが、接合点４の上流側近傍でオープン管１が該
コイルをくぐり抜けるように配置されただけの簡単な構
造である。しかしながら、高周波の表皮効果等によりエ
ッジ部３端面の角部に誘導電流が集中する傾向があり、
室温からワークコイル６で誘導加熱したのでは、とくに
厚肉管を高速造管するとき端面の角部と面部との温度差
が過大となり、角部と面部とを接合点４において同時に
固相圧接適正温度域に到達させることができない。Hereinafter, a heating method using a high-frequency current will be described as a typical example of the conventional induction heating apparatus shown in FIG. This device has a simple structure in which a multi-turn coil called a work coil 6 is arranged near the upstream side of the junction 4 so that the open tube 1 passes through the coil. However, the induced current tends to concentrate on the corners of the edge portion 3 due to the high frequency skin effect, etc.
When the induction heating is performed by the work coil 6 from the room temperature, the temperature difference between the corner and the face of the end face becomes excessive, especially when a thick-walled pipe is formed at a high speed, and the corner and the face are simultaneously solid-phase welded at the joint point 4. It cannot reach the appropriate temperature range.
【００１１】エッジ部３の温度不均一は、従来の溶接管
においても別観点から問題視されており、この対策とし
て、ワークコイル６の上流に予熱用コイルを設け、エッ
ジ部３を予め加熱しておいてワークコイル６での急速加
熱によるエッジ部３端面の角部と面部との温度差を軽減
することが知られている（前記特開平2-299782号公報、
特開平2-299783号公報参照）。The non-uniform temperature of the edge portion 3 has been regarded as a problem from a different viewpoint even in a conventional welded pipe. As a countermeasure, a preheating coil is provided upstream of the work coil 6 to heat the edge portion 3 in advance. In addition, it is known that the temperature difference between the corner portion and the face portion of the end face of the edge portion 3 due to the rapid heating in the work coil 6 is reduced (see Japanese Patent Application Laid-Open No. H2-299782,
See Japanese Patent Application Laid-Open No. 2-29983).
【００１２】図10は、従来の予熱用コイルの構造の概念
を示す斜視図で、（ａ）は水平ターン型、（ｂ）は垂直
ターン型、（ｃ）は鞍型をそれぞれ示し、９は予熱用コ
イル、７Ａは予熱電流経路であり、図９と同一部材には
同一符号を付し説明を省略する。なお、予熱電流経路７
Ａ中の矢印はある時点での電流の向きを示しており、時
間とともにこの向きが交互に逆転することは接合電流７
と同様である。FIGS. 10A and 10B are perspective views showing the concept of the structure of a conventional preheating coil. FIG. 10A shows a horizontal turn type, FIG. 10B shows a vertical turn type, FIG. The preheating coil 7A is a preheating current path, and the same members as those in FIG. 9 are denoted by the same reference numerals and description thereof is omitted. The preheating current path 7
The arrow in A indicates the direction of the current at a certain point in time.
Is the same as
【００１３】しかしながら、（ａ）の水平ターン型は、
エッジ部３だけでなくそこから少し離れた領域にも誘導
電流が密に分布して加熱されるので、加熱効率が非常に
悪く、（ｂ）の垂直ターン型は、同じエッジ部３でも予
熱用コイル９に近い側の外面ほど誘導電流が密に分布す
るので、エッジ部３端面内の温度差が大きくなり、
（ｃ）の鞍型は、図示のように誘導される予熱電流経路
７Ａが長くなるため、加熱効率が非常に悪いという欠点
がある。However, the horizontal turn type shown in FIG.
Since the induced current is densely distributed and heated not only in the edge portion 3 but also in a region slightly away from the edge portion, the heating efficiency is very poor, and the vertical turn type shown in FIG. Since the induced current is more densely distributed on the outer surface closer to the coil 9, the temperature difference in the end face of the edge portion 3 becomes larger,
The saddle type (c) has a disadvantage that the heating efficiency is very poor because the preheating current path 7A induced as shown in the figure is long.
【００１４】これらの欠点があるために、従来の予熱コ
イルを用いてオープン管１のエッジ部３を加熱しても、
ワークコイル６による加熱開始時のエッジ部３端面の角
部と面部との温度差の平均化が不十分となり、接合点４
においてエッジ部３端面全域を固相圧接適正温度域に持
ってくることは困難である。同様の不均一加熱に起因す
る問題は固相接合鋼管の製造時だけでなく、電縫管製造
時にも重要である。ラインパイプなどの厚肉管では、高
周波電流の表皮効果等によりエッジ部３端面の角部に電
流が集中する傾向があるため、角部が優先的に溶融し、
面部中央部が十分に溶融しないいわゆる冷接といった現
象が生じる。肉厚が厚くなるほどこの傾向が大きく、予
熱コイルを用いた従来の複合加熱方法を用いても十分な
対処が難しかった。Due to these disadvantages, even if the edge portion 3 of the open tube 1 is heated using a conventional preheating coil,
When the heating by the work coil 6 is started, the averaging of the temperature difference between the corners of the end surface of the edge 3 and the surface becomes insufficient, and
In this case, it is difficult to bring the entire area of the end face of the edge portion 3 into the appropriate solid-state pressure welding temperature range. The same problem caused by non-uniform heating is important not only in the production of solid-phase welded steel pipes, but also in the production of ERW pipes. In thick-walled pipes such as line pipes, the current tends to concentrate at the corners of the end face of the edge 3 due to the skin effect of high-frequency current, etc., so the corners are preferentially melted,
A phenomenon such as a so-called cold welding in which the central portion of the surface portion is not sufficiently melted occurs. This tendency increases as the wall thickness increases, and it is difficult to sufficiently cope with the conventional composite heating method using a preheating coil.
【００１５】[0015]
【発明が解決しようとする課題】上記した従来技術の問
題に鑑み、本発明は、ビード切削の必要がなく高い生産
性が確保できしかもシーム品質および表面肌に優れた鋼
管を製造できる固相圧接造管法のみならず電縫管の高
速、高品質造管法をも実現可能にするオープン管エッジ
部予熱装置を提供することを課題とする。SUMMARY OF THE INVENTION In view of the above-mentioned problems of the prior art, the present invention provides a solid-state pressure welding capable of producing a steel pipe which can ensure high productivity without bead cutting, and has excellent seam quality and surface texture. An object of the present invention is to provide an open pipe edge portion preheating device which can realize not only a pipe forming method but also a high-speed, high-quality pipe forming method for an electric resistance welded pipe.
【００１６】[0016]
【課題を解決するための手段】第１の本発明は、オープ
ン管を接合点において接合温度に加熱する本加熱装置の
上流に配設され、誘導コイルと、少なくとも二つの磁極
をもち前記誘導コイルが巻かれたインダクタと、誘導コ
イルに高周波電流を通電する高周波電源とを備え、イン
ダクタの少なくとも一つの磁極をオープン管外部からオ
ープン管のスリット部に臨ませてなることを特徴とする
オープン管エッジ部予熱装置である。According to a first aspect of the present invention, there is provided an induction coil disposed upstream of a heating device for heating an open tube to a junction temperature at a junction point, the induction coil having an induction coil and at least two magnetic poles. Characterized by comprising an inductor wound with a coil, and a high-frequency power supply for supplying a high-frequency current to the induction coil, wherein at least one magnetic pole of the inductor faces the slit of the open tube from outside the open tube. It is a section preheating device.
【００１７】第２の本発明は、第１の本発明の装置がさ
らに、インダクタに対応するオープン管内の所定の位置
にインピーダを備えたことを要旨とする。第３の本発明
は、第１、第２の本発明の装置がさらに、インダクタの
配設区間にオープン管外周を拘束する外周部ガイドロー
ルおよび／またはスリット部を拘束するスリット部ガイ
ドロールを備えたことを要旨とする。なお、外周部ガイ
ドロールとオープン部ガイドロールとは同時に装備され
るほうが好ましく、また、外周部ガイドロールのオープ
ン管接触部は非磁性体であることが好ましい。According to a second aspect of the present invention, there is provided a device according to the first aspect, further comprising an impedance at a predetermined position in the open tube corresponding to the inductor. According to a third aspect of the present invention, the device according to the first or second aspect of the present invention further comprises an outer peripheral portion guide roll for restraining an outer circumference of the open pipe and / or a slit portion guide roll for restraining a slit portion in a section where the inductor is provided. The gist is that In addition, it is preferable that the outer peripheral portion guide roll and the open portion guide roll are provided at the same time, and the open tube contact portion of the outer peripheral portion guide roll is preferably a non-magnetic material.
【００１８】[0018]
【発明の実施の形態】第１の本発明によれば、予熱装置
を、少なくとも二つの磁極をもち、誘導コイルで発生さ
せた磁力線を集束させるインダクタを備えた装置とし、
この装置をオープン管外部からオープン管のスリット部
に、インダクタの少なくとも一つの磁極を臨ませて配設
したから、インダクタの一磁極と他磁極との間の空間を
走る磁力線を、オープン管の相対する両エッジ部近傍に
集中的に配分することができ、端面に誘導される電流密
度が増大して、誘導加熱効率が大幅に向上することとな
り、端面の角部と面部との温度差を小さく保ちながらし
かも急速にエッジ部を適温まで予熱できる。According to a first aspect of the present invention, a preheating device is a device having at least two magnetic poles and having an inductor for focusing magnetic lines of force generated by an induction coil,
Since this device was installed from the outside of the open tube to the slit of the open tube with at least one magnetic pole of the inductor facing the outside, the magnetic field lines running in the space between one magnetic pole of the inductor and the other magnetic pole were compared with the open tube relative to the open tube. Can be intensively distributed in the vicinity of both edges, the current density induced in the end face increases, and the induction heating efficiency is greatly improved, and the temperature difference between the corners and the face of the end face is reduced. The edge part can be quickly preheated to an appropriate temperature while maintaining it.
【００１９】なお、本加熱装置としては、図９に示した
誘導加熱装置、抵抗加熱装置のほか、レーザビーム装
置、電子ビーム装置、プラズマビーム装置等の局所加熱
装置も使用できる。第２の本発明によれば、第１の本発
明にさらに、インダクタに対応するオープン管内の所定
の位置に、インダクタの磁極間の空間に広がって走る磁
力線を集束させるインピーダを備えたので、エッジ部近
傍への磁力線集中の制御性がさらに増し、誘導加熱効率
がより一層向上する。As the heating device, a local heating device such as a laser beam device, an electron beam device, and a plasma beam device can be used in addition to the induction heating device and the resistance heating device shown in FIG. According to the second aspect of the present invention, the first aspect of the present invention further includes an impedance at a predetermined position in the open tube corresponding to the inductor for focusing magnetic lines of force running in the space between the magnetic poles of the inductor. The controllability of the concentration of the lines of magnetic force near the portion is further increased, and the induction heating efficiency is further improved.
【００２０】第１、第２の本発明において、インダクタ
の磁極をスリット部に臨ませるにあたり、エッジ部両端
面の誘起電流密度を互いに等しくするという観点から、
相対するエッジ部両端面が当該極から等距離の位置に保
たれることが望ましい。第３の本発明によれば、第１、
第２の本発明に、インダクタの配設区間にオープン管外
周を拘束する外周部ガイドロールおよび／またはスリッ
ト部を拘束するスリット部ガイドロールを付加したの
で、エッジ部予熱時のオープン管のブレを効果的に防止
でき、通管位置管理精度が向上して前記望ましい状況が
実現する。これら外周部ガイドロールとスリット部ガイ
ドロールとは同時に装備されるほうが好ましいことは無
論である。なお、インダクタの配設区間とは、インダク
タ自体が延在する区間だけでなく、インダクタと前後の
設備（成形ロール、本加熱装置等）との間の区間をも含
む。In the first and second aspects of the present invention, when the magnetic poles of the inductor face the slit portion, from the viewpoint that the induced current densities at both end surfaces of the edge portion are made equal to each other.
It is desirable that the opposite end surfaces of the edge portion be kept at the same distance from the pole. According to a third invention, the first,
In the second aspect of the present invention, an outer peripheral guide roll for restraining the outer circumference of the open pipe and / or a slit guide roll for restraining the slit part are added to the section where the inductor is provided. This can be effectively prevented, the accuracy of pipe position management is improved, and the desirable situation is realized. Needless to say, it is preferable to equip the outer peripheral portion guide roll and the slit portion guide roll at the same time. The section where the inductor is disposed includes not only a section in which the inductor itself extends but also a section between the inductor and the preceding and following facilities (forming rolls, main heating device, and the like).
【００２１】また、これらの外周部ガイドロール17は、
磁極に出入りする磁力線によって電磁誘導されると自身
の発熱劣化に加え予熱電流への外乱ともなりかねないの
で、オープン管と接触する部分は非磁性材料、例えばス
テンレス鋼あるいはセラミックス等で構成するほうが望
ましい。よって、本発明によれば、オープン管のエッジ
部をワークコイルで誘導加熱して端面全域を固相圧接適
正温度域に昇温するための昇温開始時の端面温度分布を
適正に調えることが可能になり、それにより初めてビー
ド切削の必要がなく高い生産性が確保できしかもシーム
品質および表面肌に優れた鋼管を製造できる固相圧接造
管法が実現可能となる。また、従来の電縫鋼管製造時に
おいても、冷接やペネトレータの生成といった溶接不良
を生じることなく、優れた鋼管を製造可能となる。These outer peripheral guide rolls 17 are
If electromagnetic induction is caused by lines of magnetic force entering and exiting the magnetic pole, it may cause disturbance to the preheating current in addition to its own heat deterioration, so it is preferable that the portion in contact with the open tube be made of a non-magnetic material such as stainless steel or ceramics. . Therefore, according to the present invention, it is possible to appropriately adjust the end face temperature distribution at the time of starting the temperature rise for induction heating the edge portion of the open pipe with the work coil to raise the temperature of the entire end face to the appropriate solid-state pressure welding temperature range. For the first time, it is possible to realize a solid-state pressure welding pipe forming method that can secure a high productivity without the need for bead cutting and can manufacture a steel pipe having excellent seam quality and surface texture. In addition, even during the conventional production of an electric resistance welded steel pipe, an excellent steel pipe can be produced without causing welding defects such as cold welding and generation of a penetrator.
【００２２】[0022]
【実施例】以下、図１〜図８に本発明の実施例を開示す
る。これらの実施例では予熱電流経路を図示省略する
が、従来の予熱用コイルと本実施例とで同じサイズのオ
ープン管１を同じ電力の高周波電流で誘導加熱する理論
計算シミュレーションを行って結果を比較し、本実施例
では従来の予熱用コイルに比し、磁力線のエッジ部への
集中度が大幅に増し、エッジ部の加熱効率が500 倍以上
に向上することが確認された。1 to 8 show an embodiment of the present invention. Although the preheating current path is not shown in these examples, the theoretical calculation simulation for inductively heating the same size of the open tube 1 with the same power of the high frequency current is performed between the conventional preheating coil and the present example, and the results are compared. However, in the present example, it was confirmed that the degree of concentration of the lines of magnetic force on the edge portion was greatly increased and the heating efficiency of the edge portion was improved to 500 times or more as compared with the conventional preheating coil.
【００２３】図１は、第１の実施例の概念を示す斜視図
である。図１において、10はスリット部、11は誘導コイ
ル、12はインダクタ、13は磁極、14は磁力線である。な
お、図９と同一部材には同一符号を付し説明を省略す
る。また、通材の向き８に沿って下流に配置されている
ワークコイルは図示を省略した。図１の例は、第１の本
発明でインダクタ12が二磁極の場合に該当し、門型（Ｕ
字形）のインダクタ12の二つの磁極13に誘導コイル11を
巻き、両磁極がともにスリット部10に臨む配置形態をと
っている。この構成により、磁力線14は、インダクタ12
の一磁極〜スリット部10〜オープン管１内〜スリット部
10〜インダクタ12の他磁極という経路を辿るので、エッ
ジ部３の近傍に集中する。FIG. 1 is a perspective view showing the concept of the first embodiment. In FIG. 1, 10 is a slit portion, 11 is an induction coil, 12 is an inductor, 13 is a magnetic pole, and 14 is a line of magnetic force. The same members as those in FIG. 9 are denoted by the same reference numerals, and description thereof will be omitted. The work coil arranged downstream along the passing direction 8 is not shown. The example of FIG. 1 corresponds to the case where the inductor 12 has two magnetic poles in the first embodiment of the present invention,
An induction coil 11 is wound around two magnetic poles 13 of an L-shaped inductor 12, and both magnetic poles face the slit portion 10. With this configuration, the magnetic flux lines 14
One magnetic pole ~ slit part 10 ~ inside the open tube 1 ~ slit part
Since it follows the path from 10 to the other magnetic pole of the inductor 12, it concentrates near the edge portion 3.
【００２４】図２は、第２の実施例の概念を示す斜視図
である。図２において、15はインピーダであり、図１と
同一部材には同一符号を付し説明を省略する。図２の例
は、図１においてさらにオープン管１内の略中心部にイ
ンダクタ12と対面させてインピーダ15を挿入しており、
第２の本発明に該当する。この構成により、オープン管
１内の磁力線14がインピーダ15に集束されるので、エッ
ジ部３近傍への磁力線14の集中度がさらに高まる。FIG. 2 is a perspective view showing the concept of the second embodiment. In FIG. 2, reference numeral 15 denotes an impedance, and the same members as those in FIG. In the example of FIG. 2, an impedance 15 is further inserted substantially in the center of the open tube 1 in FIG. 1 so as to face the inductor 12.
This corresponds to the second invention. With this configuration, the lines of magnetic force 14 in the open tube 1 are focused on the impedance 15, so that the concentration of the lines of magnetic force 14 near the edge 3 is further increased.
【００２５】図３は、第３の実施例の概念を示し、
（ａ）は斜視図、（ｂ）は（ａ）のＡＡ断面図、（ｃ）
は（ｂ）の変形例の断面図、（ｄ）は簡易型の断面図で
あり、図１と同一部材には同一符号を付し説明を省略す
る。図３（ａ）〜（ｃ）の例は、Ｅ字形の三磁極のイン
ダクタ12の中央の磁極13に誘導コイル11を巻き、この中
央の磁極13をスリット部10に近づけて、両端の磁極13の
間をオープン管１が通過するような配置形態をとってお
り、第１の本発明でインダクタ12を三磁極とし、うち一
磁極をスリット部10に臨ませた場合に該当する。この構
成により、図３（ｂ）、（ｃ）に示すように、磁力線14
は中央の磁極13からスリット部10を貫通し左右に分かれ
て両端の磁極13に向かう経路を辿るので、エッジ部３の
近傍に集中する。図３（ｄ）は、Ｅ字形インダクタの両
脇の磁極の一方を省略して２磁極型としたものである。
予熱条件によっては、このような簡易型も使用できる。FIG. 3 shows the concept of the third embodiment.
(A) is a perspective view, (b) is an AA sectional view of (a), (c)
Is a cross-sectional view of a modified example of (b), and (d) is a simplified cross-sectional view. The same members as those in FIG. 1 are denoted by the same reference numerals and description thereof is omitted. 3A to 3C, an induction coil 11 is wound around a central magnetic pole 13 of an E-shaped three-pole inductor 12, and the central magnetic pole 13 is brought close to the slit portion 10 so that the magnetic poles 13 at both ends are provided. The first embodiment of the present invention corresponds to a case where the inductor 12 has three magnetic poles and one magnetic pole faces the slit portion 10 in the first embodiment of the present invention. With this configuration, as shown in FIGS.
Follows the path from the central magnetic pole 13 to the magnetic poles 13 at both ends through the slit portion 10 and splits right and left, so that it concentrates near the edge portion 3. FIG. 3D shows a two-pole type in which one of the magnetic poles on both sides of the E-shaped inductor is omitted.
Depending on the preheating conditions, such a simplified type can also be used.
【００２６】図４は、第３の実施例の他の概念を示し、
（ａ）は斜視図、（ｂ）は（ａ）のＡＡ断面図、
（ｃ）、（ｄ）は（ｂ）の変形例の断面図であり、図１
と同一部材には同一符号を付し説明を省略する。図４
（ａ）〜（ｄ）の例は、Ｅ字形のインダクタの中央の磁
極を省略して、二磁極型としたものであり、両端の磁極
13に誘導コイル11を巻き、これら両端の磁極13をオープ
ン管のスリット部10に臨ませて、両端の磁極の間をオー
プン管１が通過するような配置形態としたものである。
予熱条件によっては、このような変形型も使用できる。
この構成により、図４（ｂ）、（ｃ）、（ｄ）に示すよ
うに両端の磁極間の幅を狭めてオープン管のスリット部
10に近づけることにより、磁力線14は両磁極を結ぶ経路
を辿るので、エッジ部３の近傍に集中する。FIG. 4 shows another concept of the third embodiment.
(A) is a perspective view, (b) is an AA sectional view of (a),
FIGS. 1C and 1D are cross-sectional views of a modification of FIG.
The same members as those described above are denoted by the same reference numerals and description thereof will be omitted. FIG.
In the examples (a) to (d), the magnetic pole at the center of the E-shaped inductor is omitted to form a two-pole type, and the magnetic poles at both ends are used.
In this embodiment, the induction coil 11 is wound around 13, and the magnetic poles 13 at both ends thereof face the slit portion 10 of the open tube, so that the open tube 1 passes between the magnetic poles at both ends.
Depending on the preheating conditions, such a modified type can also be used.
With this configuration, as shown in FIGS. 4B, 4C, and 4D, the width between the magnetic poles at both ends is reduced, and the slit portion of the open tube is reduced.
By approaching 10, the magnetic force lines 14 follow a path connecting both magnetic poles, and thus concentrate on the vicinity of the edge portion 3.
【００２７】さらに、図３、図４に示した第３の実施例
でのオープン管１においても、図２に示されるようなイ
ンピーダを挿入することにより、オープン管内の磁力線
がインピーダに集束されるため、エッジ部近傍への磁力
線の集中度がさらに高まる。図５は、第４の実施例の概
念を示す断面図であり、図１と同一部材には同一符号を
付し説明を省略する。図５の（ａ）はＣ字形の二磁極の
インダクタ12の両磁極に誘導コイル11を巻き、一磁極を
スリット部10に臨ませ、他磁極をオープン管１の反対側
で一磁極に相対させて配置したもので、第１の本発明に
該当する。磁力線14は、インダクタの両磁極を結ぶ経路
を辿るので、エッジ部３の近傍に集中する。Further, also in the open tube 1 according to the third embodiment shown in FIGS. 3 and 4, by inserting an impedance as shown in FIG. 2, the magnetic force lines in the open tube are focused on the impedance. Therefore, the degree of concentration of the lines of magnetic force near the edge is further increased. FIG. 5 is a sectional view showing the concept of the fourth embodiment. The same members as those in FIG. In FIG. 5A, an induction coil 11 is wound around both magnetic poles of a C-shaped two-pole inductor 12, one magnetic pole faces the slit portion 10, and the other magnetic pole is opposed to one magnetic pole on the opposite side of the open tube 1. It corresponds to the first present invention. The magnetic force lines 14 follow a path connecting both magnetic poles of the inductor, and therefore concentrate near the edge portion 3.
【００２８】また、（ｂ）は、（ａ）と同様の配置のＣ
字形インダクタを二個、磁極側で向き合わせて互いに向
き合う磁極同士を共有させたもので、第１の本発明に該
当する。磁力線14がインダクタ12の左右に按分されて双
ループを描く点で（ａ）の単ループと相違するが、これ
も（ａ）と同様磁力線14をエッジ部３近傍に集中させる
効果がある。なお、予熱条件によっては、同図（ｃ）に
示すように（ａ）と同様配置のＣ字型インダクタ12のス
リット部10に臨む磁極13のみに誘導コイル11を巻き、反
対側の磁極13の誘導コイル11を省略することができる。
同様に、予熱条件によっては、（ｂ）についても同様に
スリット部10とは反対側の誘導コイル11の省略が可能で
ある。(B) shows C in the same arrangement as in (a).
The present invention corresponds to the first aspect of the present invention in which two letter-shaped inductors are opposed to each other on the magnetic pole side and the magnetic poles facing each other are shared. The difference from the single loop of (a) is that the magnetic lines of force 14 are equally distributed to the left and right sides of the inductor 12 to form a double loop, but this also has the effect of concentrating the magnetic lines of force 14 near the edge 3 as in (a). Depending on the preheating condition, as shown in FIG. 3C, the induction coil 11 is wound only on the magnetic pole 13 facing the slit portion 10 of the C-shaped inductor 12 arranged in the same manner as in FIG. The induction coil 11 can be omitted.
Similarly, depending on the preheating condition, it is possible to omit the induction coil 11 on the side opposite to the slit 10 similarly in (b).
【００２９】図６は、第５の実施例の概念を示す斜視図
であり、第３の本発明の具体例として示した。図６にお
いて、17は外周部ガイドロール、18はスリット部ガイド
ロールでそのうち18a はスリット部10に嵌合してそのギ
ャップを固定する凸部を胴央にもつフィン付きロール、
18b はフィン付きロールの押し力に対する反力用のロー
ルである。なお、図１と同一または相当部分にはこれと
同じ符号を付し、説明を省略する。FIG. 6 is a perspective view showing the concept of the fifth embodiment, which is shown as a third example of the present invention. In FIG. 6, 17 is an outer peripheral portion guide roll, 18 is a slit portion guide roll, 18a of which is a finned roll having a convex portion at the center of the body which fits into the slit portion 10 and fixes the gap.
18b is a roll for reaction force against the pushing force of the finned roll. The same or corresponding parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.
【００３０】本図に示すように、この実施例では、イン
ダクタ12の配置区間の要所々々に外周部ガイドロール17
を、また、そのやや上流側にフィン付きロール18a と反
力用のロール18b とからなるスリット部ガイドロール18
を付設している。図７は、第３の本発明に係る外周部ガ
イドロールの各種拘束形態を例示する断面図である。同
図（ａ）は２本の外周部ガイドロール17（当然ながらロ
ールプロフィルが管周に沿う形に加工されている）が両
脇から、（ｂ）は３本が両脇と下から、（ｃ）は３本が
両肩と下から、（ｄ）は４本が四方から、それぞれオー
プン管１の外周に回転可能に当接して拘束する配置形態
を示している。なお、外周部ガイドロール17はここに図
示した以外にも例えば５本で５方向から拘束する等々種
々の配置形態が採用可能である。このように、外周部ガ
イドロール17はインダクタの配設区間の要所々々に、一
断面当たり複数本、任意の配置形態で配設すればよい。As shown in this figure, in this embodiment, the outer peripheral guide rolls 17
And a slit portion guide roll 18 comprising a finned roll 18a and a reaction force roll 18b slightly upstream thereof.
Is attached. FIG. 7 is a cross-sectional view illustrating various types of restraint of the outer peripheral portion guide roll according to the third invention. (A) shows two outer guide rolls 17 (of course, the roll profile is processed along the pipe circumference) from both sides, and (b) shows three rolls from both sides and below. (c) shows an arrangement in which three are rotatably abutted on the outer periphery of the open pipe 1 and constrained from four sides, and (d) is four from four sides. In addition, various arrangements, such as constraining the outer peripheral guide roll 17 from five directions, for example, other than those shown here, can be adopted. In this way, the outer peripheral portion guide rolls 17 may be arranged in any number of locations in the section where the inductor is arranged, in a plurality of pieces per cross section, in any arrangement form.
【００３１】図８は、第３の本発明に係るスリット部ガ
イドロールの拘束形態を例示する断面図である。このよ
うに、フィン付きロール18a の凸部をスリット部10に嵌
合し、その反対側の外周を反力用のロール18b で支える
ように配置すればよい。反力用のロール18b は図では１
本のみ描いているが管周方向に複数本設けてもかまわな
い。FIG. 8 is a cross-sectional view illustrating a restraining form of the slit portion guide roll according to the third invention. In this manner, the protrusion of the finned roll 18a may be fitted to the slit portion 10 and the outer periphery on the opposite side may be supported by the reaction force roll 18b. The reaction force roll 18b is 1 in the figure.
Although only books are illustrated, a plurality of books may be provided in the pipe circumferential direction.
【００３２】なお、本発明は、これまでに開示した実施
例に限定されるものでなく、予熱の程度等各種条件に応
じてこれらを種々設計変更し或いは組み合わせて構成さ
れるオープン管エッジ部予熱装置も、本発明に包含され
ることはいうまでもない。また、予熱条件に応じて適
宜、本発明の予熱装置をオープン管の軸方向に複数配列
して使用することもできる。The present invention is not limited to the embodiments disclosed so far. The preheating of the open pipe edge portion is made by variously changing or combining these in accordance with various conditions such as the degree of preheating. It goes without saying that a device is also included in the present invention. Further, a plurality of the preheating devices of the present invention can be arranged and used in the axial direction of the open pipe as appropriate according to preheating conditions.
【００３３】この例を図11、図12に示す。図11はＵ字形
インダクタ、図12はＣ字形インダクタを通板方向に沿っ
て複数個直列に配設したケースを示している。なお、図
11、図12において、６はワークコイル、19はスクイズロ
ールであり、図６と同一または相当部材には同一符号を
付し、説明を省略する。図11、図12に例示するように、
複数のインダクタ12を配設した場合は、インダクタの誘
導コイル11への供給電流の周波数および電流値を、素材
板厚、材質、通材速度等に応じて、それぞれのインダク
タで異なった値とすることにより、予熱されたエッジ部
の温度分布の均一性を高めたり、場合によっては所望の
温度分布を得たりすることが容易となる。このような場
合、一部のインダクタには、低周波電流を供給すると、
前記した効果が一層容易に得られる場合もある。This example is shown in FIGS. FIG. 11 shows a case where a plurality of U-shaped inductors are arranged in series along the direction of the plate, and FIG. 12 shows a case where a plurality of C-shaped inductors are arranged in series. The figure
In FIGS. 11 and 12, reference numeral 6 denotes a work coil, and reference numeral 19 denotes a squeeze roll. The same or corresponding members as in FIG. As exemplified in FIGS. 11 and 12,
When a plurality of inductors 12 are provided, the frequency and the current value of the current supplied to the induction coil 11 of the inductors are set to different values for each inductor according to the material plate thickness, the material, the material passing speed, and the like. Thereby, it becomes easy to improve the uniformity of the temperature distribution of the preheated edge portion and to obtain a desired temperature distribution in some cases. In such a case, supplying low-frequency current to some inductors
In some cases, the above-described effects can be more easily obtained.
【００３４】また、インダクタを複数配設することによ
り、各インダクタの負荷が軽減されるため、冷却が簡単
になり、特に、大板厚、高速造管を狙う場合には、単独
配設に比して、設備コストの低廉化、設備の長寿命化等
のメリットが得られる。 ＜本発明のオープン管エッジ部予熱装置の予熱性能検証
例＞オープン管の両エッジ部を衝合圧接して鋼管とする
連続製管ラインにおいて、帯板から成形され初期管体温
度６００℃に全体加熱されたオープン管を１４０ｍ／ｍ
ｉｎで通過させながら、エッジ部端面間距離が１０ｍｍ
となるライン位置でエッジ部予熱を施し、その下流で両
エッジ部端面をさらに圧接温度まで誘導加熱し衝合圧接
して肉厚６ｍｍ、外径１３０ｍｍの機械構造用鋼管（Ｓ
ＴＫＭ１１Ａ相当）を製管する際に、表１に「発明例」
として諸元・誘導条件を示す本発明のオープン管エッジ
部予熱装置を用いてエッジ部予熱を行い、誘導コイル通
過直後のエッジ部端面を放射温度計で測定して得た予熱
後端面平均温度を表１に示す。In addition, by arranging a plurality of inductors, the load on each inductor is reduced, so that cooling is simplified. As a result, advantages such as lower equipment costs and longer life of the equipment can be obtained. <Example of verification of the preheating performance of the open pipe edge preheating device of the present invention> In a continuous pipe production line in which both edges of the open pipe are abutted and pressed to form a steel pipe, the entire pipe is formed from a strip and has an initial pipe temperature of 600 ° C. 140m / m for heated open tube
While passing in, the distance between edge end faces is 10mm
The edge portion is preheated at the line position, and both ends are further induction-heated to the pressure contact temperature downstream of the edge portion, and then abuttingly pressed to form a 6 mm thick, 130 mm outer diameter steel pipe for machine structure (S
When producing TKM11A), Table 1 shows “Invention Examples”.
Preheat the edge portion using the open pipe edge preheating device of the present invention showing the specifications and induction conditions as, the average temperature of the preheated end surface obtained by measuring the edge end surface immediately after passing the induction coil with a radiation thermometer. It is shown in Table 1.
【００３５】なお、表１中、「磁心」はインダクタを指
す。また、上記と同じオープン管に対し、発明例に代え
て表１に「従来例」として諸元・誘導条件を示す従来の
予熱用コイルを用いた場合の予熱後端面平均温度を表１
に併せて示す。なお、表１には、同じ長さをカバーする
誘導コイルに同じ周波数・電流値の電流を流した発明例
と従来例とを３水準（Ａ，Ｂ，Ｃ）対比して示し、各装
置の形態は表１の対応欄に記入した図番の図面に掲載さ
れている。In Table 1, "magnetic core" indicates an inductor. For the same open pipe as above, the average temperature of the end face after preheating is shown in Table 1 in the case of using a conventional preheating coil which shows specifications and induction conditions as “conventional example” in place of the invention example in Table 1.
Are shown together. In addition, Table 1 shows an invention example and a conventional example in which currents of the same frequency and current value are applied to induction coils covering the same length, in comparison with three levels (A, B, C). The form is described in the drawing of the figure number entered in the corresponding column of Table 1.
【００３６】また、発明例、従来例とも外周部ガイドロ
ールおよびスリット部ガイドロールを使用し、外周部ガ
イドロールには13Mn非磁性鋼を用いた。In each of the invention example and the conventional example, an outer peripheral guide roll and a slit guide roll were used, and 13Mn nonmagnetic steel was used for the outer peripheral guide roll.
【００３７】[0037]
【表１】 [Table 1]
【００３８】表１からわかるように、予熱後端面平均温
度は、従来例Ａでは６０１℃と初期管体温度６００℃か
ら１℃しか上昇していないのに対し、発明例Ａでは８６
３℃にまで上昇し、また従来例Ｂに至っては５７６℃と
初期管体温度６００℃から逆に４℃低下したのに対し、
発明例Ｂ１では８９２℃にまで、発明例Ｂ２では９２３
℃にまで、発明例Ｂ３では９４４℃にまで、それぞれ上
昇し、また従来例Ｃでは６２３℃と従来例の中では最も
高い昇温量がえられるものの高々２３℃であるのに対
し、発明例Ｃでは９６４℃にまで上昇した。As can be seen from Table 1, the average temperature of the end face after preheating is 601 ° C. in the conventional example A, which is only 1 ° C. higher than the initial tube temperature of 600 ° C., whereas it is 86 ° in the invention example A.
3 ° C., and in Conventional Example B, 576 ° C., which was 4 ° C. lower than 600 ° C.
Inventive Example B1 reached 892 ° C., and Inventive Example B2 reached 923 ° C.
° C, to 944 ° C in Invention Example B3, and to 623 ° C in Conventional Example C, which is the highest in the conventional example, but at most 23 ° C. In C, the temperature rose to 964 ° C.
【００３９】このように、本発明によれば、従来に比べ
格段に効率のよいオープン管エッジ部予熱が可能であ
る。As described above, according to the present invention, it is possible to preheat the open pipe edge portion much more efficiently than in the prior art.
【００４０】[0040]
【発明の効果】本発明によれば、オープン管のエッジ部
端面全域をワークコイル等の本加熱装置で加熱して固相
圧接適正温度域に昇温するための昇温開始時の端面温度
分布を適正に調えることが可能になり、それにより初め
てビード切削の必要がなく高い生産性が確保できしかも
シーム品質および表面肌に優れた鋼管を製造できる固相
圧接造管法が実現可能となるという格段の効果を奏す
る。According to the present invention, the end face temperature distribution at the start of heating for heating the entire end face of the edge portion of the open pipe with the main heating device such as a work coil to raise the temperature to the appropriate solid phase pressure welding temperature range. Can be adjusted appropriately, and for the first time, it is possible to realize a solid-state pressure welding method that can secure high productivity without the need for bead cutting and can produce steel pipe with excellent seam quality and surface skin. It has a remarkable effect.
【図１】第１の実施例の概念を示す斜視図である。FIG. 1 is a perspective view showing the concept of a first embodiment.
【図２】第２の実施例の概念を示す斜視図である。FIG. 2 is a perspective view showing the concept of the second embodiment.
【図３】第３の実施例の概念を示し、（ａ）は斜視図、
（ｂ）は（ａ）のＡＡ断面図、（ｃ）は（ｂ）の変形例
の断面図、（ｄ）は簡易型の断面図である。3A and 3B show a concept of a third embodiment, in which FIG.
(B) is an AA sectional view of (a), (c) is a sectional view of a modification of (b), and (d) is a simplified sectional view.
【図４】第３の実施例の他の概念を示し、（ａ）は斜視
図、（ｂ）は（ａ）のＡＡ断面図、（ｃ）、（ｄ）は
（ｂ）の変形例の断面図である。4A and 4B show another concept of the third embodiment, in which FIG. 4A is a perspective view, FIG. 4B is a sectional view taken along the line AA of FIG. 4A, and FIGS. It is sectional drawing.
【図５】第４の実施例の概念を示す断面図である。FIG. 5 is a sectional view showing the concept of the fourth embodiment.
【図６】第５の実施例の概念を示す斜視図である。FIG. 6 is a perspective view showing the concept of the fifth embodiment.
【図７】第３の本発明に係る外周部ガイドロールの各種
拘束形態を例示する断面図である。FIG. 7 is a cross-sectional view illustrating various constrained forms of an outer peripheral guide roll according to a third invention.
【図８】第３の本発明に係るスリット部ガイドロールの
拘束形態を例示する断面図である。FIG. 8 is a cross-sectional view illustrating a restricted form of a slit portion guide roll according to a third invention.
【図９】一般的な誘導加熱装置、抵抗加熱装置の概念を
示す斜視図である。FIG. 9 is a perspective view showing the concept of a general induction heating device or resistance heating device.
【図10】従来の予熱用コイルの構造の概念を示す斜視図
で、（ａ）は水平ターン型、（ｂ）は垂直ターン型、
（ｃ）は鞍型をそれぞれ示す。10A and 10B are perspective views showing the concept of the structure of a conventional preheating coil, wherein FIG. 10A is a horizontal turn type, FIG.
(C) shows a saddle type, respectively.
【図11】Ｕ字形インダクタの複数配設例を示す斜視図で
ある。FIG. 11 is a perspective view showing an example of disposing a plurality of U-shaped inductors.
【図12】Ｃ字形インダクタの複数配設例を示す斜視図で
ある。FIG. 12 is a perspective view illustrating an example of disposing a plurality of C-shaped inductors.
１ オープン管 ２ 鋼管 ３ エッジ部 ４ 接合点 ５ シーム部 ６ ワークコイル ７ 接合電流経路 ７Ａ 予熱電流経路 ８ 通材の向き ９ 予熱用コイル 10 スリット部 11 誘導コイル 12 インダクタ 13 磁極 14 磁力線 15 インピーダ 16、16Ａ コンタクトチップ 17 外周部ガイドロール 18 スリット部ガイドロール 18ａ スリット部ガイドロール（フィン付きロール） 18ｂ スリット部ガイドロール（反力用） 19 スクイズロール DESCRIPTION OF SYMBOLS 1 Open pipe 2 Steel pipe 3 Edge part 4 Joining point 5 Seam part 6 Work coil 7 Joining current path 7A Preheating current path 8 Direction of passing material 9 Preheating coil 10 Slit part 11 Induction coil 12 Inductor 13 Magnetic pole 14 Magnetic field line 15 Impeder 16, 16A Contact tip 17 Outer guide roll 18 Slit guide roll 18a Slit guide roll (finned roll) 18b Slit guide roll (for reaction force) 19 Squeeze roll
───────────────────────────────────────────────────── フロントページの続き (72)発明者 天笠 敏明 千葉県千葉市中央区川崎町１番地 川崎製 鉄株式会社千葉製鉄所内 (72)発明者 板谷 元晶 愛知県半田市川崎町１丁目１番地 川崎製 鉄株式会社知多製造所内 (72)発明者 橋本 裕二 愛知県半田市川崎町１丁目１番地 川崎製 鉄株式会社知多製造所内 (72)発明者 田中 伸樹 愛知県半田市川崎町１丁目１番地 川崎製 鉄株式会社知多製造所内 (72)発明者 大西 寿雄 愛知県半田市川崎町１丁目１番地 川崎製 鉄株式会社知多製造所内 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshiaki Amagasa 1 Kawasaki-cho, Chuo-ku, Chiba City, Chiba Prefecture Inside the Chiba Works of Kawasaki Steel Corporation (72) Inventor Motoaki Itaya 1-1-1, Kawasaki-cho, Handa-shi, Aichi Prefecture Kawasaki Steel Corporation Chita Works (72) Inventor Yuji Hashimoto 1-1-1, Kawasakicho, Handa City, Aichi Prefecture Kawasaki Steel Corporation Chita Works (72) Inventor Nobuki Tanaka 1-1-1, Kawasakicho, Handa City, Aichi Prefecture Kawasaki Steel Corporation Chita Works (72) Inventor Toshio Onishi 1-1-1, Kawasaki-cho, Handa-shi, Aichi Prefecture Kawasaki Steel Corporation Chita Works
Claims (4)
加熱する本加熱装置の上流に配設され、誘導コイルと、
少なくとも二つの磁極をもち前記誘導コイルが巻かれた
インダクタと、誘導コイルに高周波電流を通電する高周
波電源とを備え、インダクタの少なくとも一つの磁極を
オープン管外部からオープン管のスリット部に臨ませて
なることを特徴とするオープン管エッジ部予熱装置。1. An induction coil disposed upstream of a main heating device for heating an open pipe to a joining temperature at a joining point;
An inductor having at least two magnetic poles and wound with the induction coil, and a high-frequency power supply for supplying a high-frequency current to the induction coil, wherein at least one magnetic pole of the inductor faces the slit portion of the open tube from outside the open tube. An open pipe edge preheating device, characterized in that:
定の位置にインピーダを備えた請求項１記載のオープン
管エッジ部予熱装置。2. The open pipe edge preheating apparatus according to claim 1, further comprising an impedance at a predetermined position in the open pipe corresponding to the inductor.
を拘束する外周部ガイドロールおよび／またはスリット
部を拘束するスリット部ガイドロールを備えた請求項１
または２に記載のオープン管エッジ部予熱装置。3. The apparatus according to claim 1, further comprising an outer peripheral guide roll for restraining the outer circumference of the open pipe and / or a slit guide roll for restraining the slit in the section where the inductor is provided.
Or the open pipe edge part preheating apparatus of 2.
が非磁性体である請求項３記載のオープン管エッジ部予
熱装置。4. The open pipe edge preheating apparatus according to claim 3, wherein the open pipe contact portion of the outer peripheral guide roll is a non-magnetic material.
Priority Applications (11)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33943296A JP3556061B2 (en) | 1996-06-11 | 1996-12-19 | Open pipe edge preheating device |
| MYPI97002583A MY125553A (en) | 1996-06-11 | 1997-06-10 | Method of and apparatus for producing steel pipes |
| DE69704132T DE69704132T2 (en) | 1996-06-11 | 1997-06-10 | Method and device for manufacturing steel pipes |
| EP97304040A EP0812633B1 (en) | 1996-06-11 | 1997-06-10 | Method of and apparatus for producing steel pipes |
| US08/872,427 US5942132A (en) | 1996-06-11 | 1997-06-10 | Method of and apparatus for producing steel pipes |
| ES97304040T ES2156342T3 (en) | 1996-06-11 | 1997-06-10 | METHOD AND APPARATUS FOR THE PRODUCTION OF STEEL PIPES. |
| AT97304040T ATE199332T1 (en) | 1996-06-11 | 1997-06-10 | METHOD AND DEVICE FOR PRODUCING STEEL PIPES |
| TW086108049A TW350800B (en) | 1996-06-11 | 1997-06-11 | Manufacturing method and equipment for steel pipes |
| KR1019970024214A KR100293577B1 (en) | 1996-06-11 | 1997-06-11 | Method of and apparatus for producing steel pipes |
| CN97114811A CN1096328C (en) | 1996-06-11 | 1997-06-11 | Producing method and preparing equipment for steel pipe |
| IDP972001A ID17262A (en) | 1996-06-11 | 1997-06-11 | METHODS AND EQUIPMENT FOR PRODUCING STEEL PIPES |
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14945496 | 1996-06-11 | ||
| JP8-149454 | 1996-10-22 | ||
| JP8-279660 | 1996-10-22 | ||
| JP27966096 | 1996-10-22 | ||
| JP33943296A JP3556061B2 (en) | 1996-06-11 | 1996-12-19 | Open pipe edge preheating device |
| US08/872,427 US5942132A (en) | 1996-06-11 | 1997-06-10 | Method of and apparatus for producing steel pipes |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10180350A true JPH10180350A (en) | 1998-07-07 |
| JP3556061B2 JP3556061B2 (en) | 2004-08-18 |
Family
ID=27472932
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33943296A Expired - Fee Related JP3556061B2 (en) | 1996-06-11 | 1996-12-19 | Open pipe edge preheating device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3556061B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008156663A3 (en) * | 2007-06-13 | 2009-02-26 | Fluxtrol Inc | Magnetic flux guide for continuous high frequency welding of closed profiles |
| WO2014027564A1 (en) * | 2012-08-17 | 2014-02-20 | 新日鐵住金株式会社 | Welding device for electric resistance welded pipe |
| CN109986249A (en) * | 2019-04-30 | 2019-07-09 | 宁夏吴忠市好运电焊机有限公司 | High frequency furnace preheating device for welding robot welding heavy wall weldment |
-
1996
- 1996-12-19 JP JP33943296A patent/JP3556061B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008156663A3 (en) * | 2007-06-13 | 2009-02-26 | Fluxtrol Inc | Magnetic flux guide for continuous high frequency welding of closed profiles |
| WO2014027564A1 (en) * | 2012-08-17 | 2014-02-20 | 新日鐵住金株式会社 | Welding device for electric resistance welded pipe |
| CN109986249A (en) * | 2019-04-30 | 2019-07-09 | 宁夏吴忠市好运电焊机有限公司 | High frequency furnace preheating device for welding robot welding heavy wall weldment |
| CN109986249B (en) * | 2019-04-30 | 2024-03-29 | 宁夏吴忠市好运电焊机有限公司 | High-frequency electric furnace preheating device for welding thick-wall weldments by welding robot |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3556061B2 (en) | 2004-08-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102858488B (en) | Be applicable to the steel band docking machine of the induction heat treatment of butt weld | |
| US3127674A (en) | Welding of ferrous tubing | |
| JP5626497B2 (en) | ERW pipe welding equipment | |
| JP3399445B2 (en) | Strip connection method in steel plate continuous processing line | |
| JP2008053010A (en) | Induction heating device and method for metal plate | |
| JPH10180350A (en) | Open tube edge part pre-heating device | |
| CN108044227B (en) | Resistance welding pipe welding device | |
| JP6436267B2 (en) | ERW pipe welding apparatus and ERW pipe welding method | |
| JPH1076372A (en) | Device for preheating open tube edge | |
| JP3313304B2 (en) | Open tube induction heating device | |
| JPS6397373A (en) | Method and device for welding high frequency electric welded pipe | |
| JP3098024U (en) | Induction heating hybrid arc welding equipment | |
| JP2924675B2 (en) | Manufacturing method of welded section steel | |
| JP3288600B2 (en) | Steel pipe manufacturing method | |
| JP6834724B2 (en) | Electric sewing pipe welding equipment | |
| JPH08155656A (en) | Production of resistance welded steel tube having excellent weld zone | |
| JPH04237513A (en) | Manufacturing device for electro-resistance-welded tube | |
| JPH07204863A (en) | Manufacture of resistance welded tube | |
| JPH1177148A (en) | Manufacturing equipment line for steel tube | |
| JPH03133575A (en) | Continuous manufacture and equipment for metallic welded pipe combining high-frequency preheating with high density energy melting and welding process | |
| JPH05228650A (en) | Manufacture of resistance welded tube | |
| JP2002113593A (en) | Method and device for manufacturing packing tube for powdery material | |
| JP2011258586A (en) | Induction heating apparatus and induction heating method for metal plate | |
| JPH091366A (en) | Laser welding method used alsd for high frequency wave preheating for welded tube and its manufacturing device | |
| JPH01309792A (en) | Production of electric welded pipe by combination use of energy beam |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20040210 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20040409 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20040511 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20040511 |
|
| R150 | Certificate of patent or registration of utility model |
Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
| S111 | Request for change of ownership or part of ownership |
Free format text: JAPANESE INTERMEDIATE CODE: R313115 |
|
| S531 | Written request for registration of change of domicile |
Free format text: JAPANESE INTERMEDIATE CODE: R313531 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090521 Year of fee payment: 5 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090521 Year of fee payment: 5 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100521 Year of fee payment: 6 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110521 Year of fee payment: 7 |
|
| LAPS | Cancellation because of no payment of annual fees |