JPH1069977A - Induction heating method and device - Google Patents
Induction heating method and deviceInfo
- Publication number
- JPH1069977A JPH1069977A JP8229032A JP22903296A JPH1069977A JP H1069977 A JPH1069977 A JP H1069977A JP 8229032 A JP8229032 A JP 8229032A JP 22903296 A JP22903296 A JP 22903296A JP H1069977 A JPH1069977 A JP H1069977A
- Authority
- JP
- Japan
- Prior art keywords
- heating
- site
- work coil
- cooling medium
- heated
- 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
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Landscapes
- General Induction Heating (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、鋼管等の金属管同
士あるいは棒鋼等の金属棒同士を長さ方向に突合せ接合
する場合等において、接合時の加熱あるいは接合後の熱
処理等、長さ方向の制限された部位を誘導加熱するとと
もに、加熱終了後は急速冷却可能な方法および装置に関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of joining metal tubes such as steel pipes or metal rods such as steel bars in the lengthwise direction, such as heating during joining or heat treatment after joining. And a device capable of rapid cooling after the completion of the heating while inductively heating the restricted area.
【０００２】[0002]
【従来の技術】鋼管等の金属管同士、あるいは棒鋼等の
金属棒同士を長さ方向に突合せ接合する手段として、Ｍ
ＩＧ溶接やＴＩＧ溶接等の溶接、圧接、拡散接合などが
知られている。拡散接合には、両端面の間に非晶質金属
箔を介在させ、該箔の含有元素を両材料中に拡散させる
方法もある。2. Description of the Related Art Metal pipes such as steel pipes or metal rods such as steel bars are butt-jointed in the longitudinal direction.
Welding such as IG welding and TIG welding, pressure welding, diffusion bonding and the like are known. Diffusion bonding includes a method in which an amorphous metal foil is interposed between both end faces, and elements contained in the foil are diffused into both materials.
【０００３】これらの接合において、溶接の場合は、材
料によっては溶接後の熱処理のための加熱が必要であ
る。圧接や拡散接合の場合は、接合のための加熱が必要
である。加熱手段としては誘導加熱が広く採用され、被
加熱材の所要加熱深さに応じて適正な周波数が選択され
る。[0003] In these joints, in the case of welding, heating for heat treatment after welding is required depending on the material. In the case of pressure welding or diffusion bonding, heating for bonding is required. Induction heating is widely used as the heating means, and an appropriate frequency is selected according to the required heating depth of the material to be heated.
【０００４】ところで、接合時の加熱や接合後の熱処理
の際、接合部以外の母材が加熱されると、強度低下等の
材質劣化が生じるという問題があるので、加熱部位は、
接合部の両側で必要最小限の狭い範囲に制限するのが望
まれる。このため、加熱部位から外れた部位を水噴射な
どにより強制的に冷却することが考えられる。[0004] By the way, in the case of heating at the time of joining or heat treatment after joining, if a base material other than the joining portion is heated, there is a problem that material deterioration such as a decrease in strength occurs.
It is desirable to limit the joints to a minimum necessary narrow range on both sides. For this reason, it is conceivable to forcibly cool a part deviating from the heated part by water injection or the like.
【０００５】鋼材を圧接または溶接した後の接合部熱処
理方法および装置として、特開昭５３−１１９２４３号
公報には、鋼材に沿って搬送可能な台車上に誘導加熱装
置および水噴射冷却装置と接合部検出器を載置し、接合
部の位置からずれることなく正確に位置合わせして加熱
および冷却を行うことが開示されている。しかし、該公
報の技術は、接合部を加熱するときはその周囲は強制冷
却せず、加熱終了後の接合部を冷却するもので、加熱部
位を狭い範囲に制限することはできない。Japanese Patent Application Laid-Open No. 53-119243 discloses a method and an apparatus for heat treatment of a joint after press-welding or welding a steel material. It is disclosed that a partial detector is placed and accurately aligned without heating from the position of the joint to perform heating and cooling. However, the technique disclosed in this publication does not forcibly cool the periphery of the joint when heating it, but cools the joint after heating is completed, and cannot limit the heating portion to a narrow range.
【０００６】[0006]
【発明が解決しようとする課題】金属管あるいは金属棒
の誘導加熱においては、ワークコイルで囲まれた部位が
加熱されるので、この加熱部位を短縮するにはワークコ
イルの巻きを密にするか、あるいは巻数を減らして加熱
帯を狭くすることが必要である。しかし、ワークコイル
の巻き密度を高めるには、各巻線間の絶縁維持の点で制
約がある。また、巻数を減じると、加熱部位を所定温度
に加熱するのに必要な誘導電流を流すためには、コイル
に大電流を流すことが必要となり、電源を大容量かつ大
型化しなければならない。In the induction heating of a metal tube or a metal rod, a portion surrounded by a work coil is heated. To shorten the heated portion, the work coil must be densely wound. Alternatively, it is necessary to narrow the heating zone by reducing the number of turns. However, in order to increase the winding density of the work coil, there is a limitation in maintaining insulation between the windings. In addition, when the number of turns is reduced, a large current needs to be passed through the coil in order to pass an induced current required to heat the heated portion to a predetermined temperature, and the power supply must be large in capacity and size.
【０００７】本発明は、鋼管等の金属管同士あるいは棒
鋼等の金属棒同士を長さ方向に突合せ接合する場合等に
おいて、接合時の加熱あるいは接合後の熱処理等、長さ
方向の制限された部位を誘導加熱するための方法および
装置であって、ワークコイルの絶縁維持に問題がなく、
かつ電源の大容量化、大型化も要せず、また加熱終了後
は急速冷却可能な方法および装置を提供することを目的
とする。According to the present invention, in the case where metal pipes such as steel pipes or metal rods such as steel bars are butt-joined in the length direction, the length in the length direction is limited such as heating at the time of joining or heat treatment after joining. A method and apparatus for induction heating of a part, wherein there is no problem in maintaining insulation of a work coil,
Further, it is an object of the present invention to provide a method and an apparatus which do not require a large capacity and a large power supply and which can be rapidly cooled after heating.
【０００８】[0008]
【課題を解決するための手段】上記目的を達成するため
の本発明法は、金属管または金属棒の長さ方向の制限さ
れた部位を誘導加熱する方法であって、加熱部位をワー
クコイルで囲み、かつ該ワークコイルで囲まれた部位の
内の該加熱部位から外れた部位と該ワークコイルとの間
に冷却媒体噴射装置を配設することにより、該加熱部位
から外れた部位を冷却することを特徴とする誘導加熱法
である。According to the present invention, there is provided a method for inductively heating a limited portion of a metal tube or a metal rod in a longitudinal direction, wherein the heated portion is formed by a work coil. By arranging a cooling medium ejecting device between the work coil and a part of the part surrounded and surrounded by the work coil and deviating from the heating part, the part deviated from the heating part is cooled. An induction heating method characterized in that:
【０００９】また、上記目的を達成するための本発明装
置は、金属管または金属棒の長さ方向の制限された部位
を誘導加熱する装置であって、加熱部位を囲むワークコ
イルを有し、かつ該ワークコイルで囲まれた部位の内の
該加熱部位から外れた部位と該ワークコイルとの間に冷
却媒体噴射装置が配設され、該加熱部位と冷却媒体噴射
部位との境界に被加熱材を囲繞する仕切り板が設けられ
ていることを特徴とする誘導加熱装置である。Further, the present invention for achieving the above object is an apparatus for induction heating a limited portion in a longitudinal direction of a metal tube or a metal rod, comprising a work coil surrounding the heated portion, A cooling medium ejecting device is provided between the work coil and a portion of the portion surrounded by the work coil that is separated from the heated portion, and heat is applied to a boundary between the heated portion and the cooling medium ejecting portion. An induction heating apparatus characterized in that a partition plate surrounding a material is provided.
【００１０】[0010]
【発明の実施の形態】本発明法を、金属管の拡散接合を
例にして説明する。図１は、金属管１と金属管２を突合
せ接合している状態の断面を示す。金属管１の端面は凸
テーパ、金属管２の端面は凹テーパにそれぞれ加工し、
両者を非晶質金属箔（図示せず）を挟んで嵌合し、加圧
下で接合部３を含む制限された範囲の加熱部位４を加熱
している。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The method of the present invention will be described by taking diffusion bonding of a metal tube as an example. FIG. 1 shows a cross section of a state where a metal tube 1 and a metal tube 2 are butt-joined. The end face of the metal tube 1 is processed into a convex taper, and the end surface of the metal tube 2 is processed into a concave taper,
Both are fitted with an amorphous metal foil (not shown) interposed therebetween, and the heating portion 4 in a limited range including the joint 3 is heated under pressure.
【００１１】加熱部位４をワークコイル５で囲み、かつ
ワークコイル５で囲まれた部位の内の加熱部位４から外
れた部位とワークコイル５との間に冷却媒体噴射装置６
を配設し、金属管１，２の周方向に複数設けられた噴射
孔７から水などの冷却媒体を噴射し冷却している。噴射
孔７の形状は、円、楕円、多角形などとすることができ
る。また、必要に応じてスプレーを使用してもよい。加
熱部位４と冷却部位との境界には仕切り板８をリング状
に設け、加熱部位に冷却媒体がかからないようにしてい
る。The heating part 4 is surrounded by a work coil 5, and a cooling medium injection device 6 is provided between the work coil 5 and a part of the part surrounded by the work coil 5, the part deviating from the heating part 4.
And a cooling medium such as water is injected from a plurality of injection holes 7 provided in the circumferential direction of the metal pipes 1 and 2 to cool them. The shape of the injection hole 7 can be a circle, an ellipse, a polygon, or the like. Further, a spray may be used as necessary. A partition plate 8 is provided at the boundary between the heating part 4 and the cooling part in a ring shape so that the cooling medium does not cover the heating part.
【００１２】したがって本例においては、接合部３を含
む長さ方向に制限された範囲の加熱部位４が選択的に加
熱され、加熱部位４から外れた部位においては加熱が抑
制される。加熱部位４を接合部３およびその両側の拡散
に必要な範囲とすることにより、必要最小限の範囲のみ
が所要の高温に加熱され、加熱部位４から外れた部位の
母材の高温化が抑制されるので、母材の強度低下などの
材質劣化を抑制することができる。Therefore, in the present embodiment, the heating portion 4 within the range limited in the length direction including the joint portion 3 is selectively heated, and heating is suppressed in a portion outside the heating portion 4. By setting the heated portion 4 to a range necessary for diffusion of the joint 3 and both sides thereof, only the minimum necessary range is heated to a required high temperature, and the temperature of the base material at a portion outside the heated portion 4 is suppressed. Therefore, it is possible to suppress material deterioration such as a decrease in the strength of the base material.
【００１３】また、誘導加熱終了後も、引き続き冷却媒
体噴射装置６による冷却を継続させることで加熱後の急
冷を行うこともできる。加熱後の急冷により、接合部３
および母材の材質劣化が抑制されるほか、加熱部位４が
常温になるまでの時間が短縮され、接合作業の効率向上
にも繋がる。Further, even after the induction heating is completed, rapid cooling after the heating can be performed by continuing the cooling by the cooling medium injection device 6. Joint 3
In addition to suppressing the deterioration of the material of the base material, the time required for the heated portion 4 to reach the normal temperature is shortened, which leads to an improvement in the efficiency of the joining operation.
【００１４】なお本発明法において、冷却媒体噴射装置
６は、図１の例のように加熱部位４の両側に配設するほ
か、片側に配設する場合もある。例えば、金属管２が短
尺でフランジ等の他の部材に接合されているときは、ワ
ークコイル５が全体的に金属管１側に片寄り、金属管２
側には冷却媒体噴射装置６が配設できなくなる。このよ
うなとき、フランジ等は熱伝導により、あるいはフラン
ジ等を冷却することにより、加熱部位４から外れた金属
管２の過熱を抑制することができる。また、材質の異な
る金属材料同士を接合する場合で、片側の金属材料のみ
が熱影響により材質劣化のおそれがあるときは、該材料
側のみに冷却媒体噴射装置６を配設すればよい。In the method of the present invention, the cooling medium injection device 6 may be provided on both sides of the heating portion 4 as shown in the example of FIG. 1, or may be provided on one side. For example, when the metal tube 2 is short and joined to another member such as a flange, the work coil 5 is generally shifted to the metal tube 1 side, and the metal tube 2
The cooling medium injection device 6 cannot be disposed on the side. In such a case, the flange or the like can suppress overheating of the metal tube 2 coming off the heating part 4 by heat conduction or by cooling the flange or the like. In the case where metal materials having different materials are joined to each other and only one metal material is likely to deteriorate due to heat, the cooling medium injection device 6 may be provided only on the material side.
【００１５】本例のような非晶質金属箔を介した拡散接
合において、加熱部位４の温度は、鋼材の場合１２００
℃程度であり、その範囲は、接合部３から両側にそれぞ
れ１mm以上あればよく、図１の例のように両金属管１お
よび２の接合部端面に４５°のテーパを形成した場合
は、肉厚＋３mm以上とすればよい。加熱部位４がこのよ
うな高温となるので、ワークコイル５を保護するため、
加熱部位４には断熱材９を巻き付けておくのが好まし
い。なお、冷却媒体噴射装置６の配設位置は、本例に限
らず、加熱条件や被加熱材の材質に応じて、加熱部位４
から離した位置に配設することもできる。In the diffusion bonding via the amorphous metal foil as in the present embodiment, the temperature of the heating portion 4 is 1200 in the case of steel.
1 ° C., and the range only needs to be 1 mm or more on each side from the joint 3. When a 45 ° taper is formed on the joint end surfaces of both the metal tubes 1 and 2 as in the example of FIG. The thickness may be set to be +3 mm or more. Since the heating portion 4 is at such a high temperature, in order to protect the work coil 5,
It is preferable that a heat insulating material 9 is wound around the heating portion 4. The arrangement position of the cooling medium injection device 6 is not limited to this example, and the heating portion 4 may be changed according to the heating conditions and the material of the material to be heated.
It can be arranged at a position away from the camera.
【００１６】本発明法は、上記金属管の例のほか、金属
棒同士の拡散接合にも適用することができる。また、拡
散接合に限らず、金属管１と金属管２、あるいは金属棒
同士を圧接する場合や溶接後の熱処理等にも適用するこ
とができる。本発明法によれば、ワークコイルの巻線密
度を絶縁維持に問題のない範囲とし、かつ巻数を減じる
必要がないので、電源を大容量化、大型化することな
く、制限された狭い範囲の加熱部位を所要温度に加熱し
て接合することができる。そして加熱部位を外れた部位
では母材の強度低下などの材質劣化を抑制することがで
きる。The method of the present invention can be applied to diffusion bonding between metal rods in addition to the above-described example of the metal tube. Further, the present invention is not limited to diffusion bonding, and can be applied to a case where the metal tube 1 and the metal tube 2 or metal rods are pressed together or a heat treatment after welding. According to the method of the present invention, the winding density of the work coil is set to a range where there is no problem in maintaining the insulation, and it is not necessary to reduce the number of windings. The heating part can be heated to a required temperature and joined. Then, at a portion outside the heated portion, material deterioration such as a decrease in the strength of the base material can be suppressed.
【００１７】図１のような非晶質金属箔を挟んだ拡散接
合は、ＭＩＧ溶接やＴＩＧ溶接、あるいは圧接など他の
接合手段に比べて安価かつ容易に行うことができるの
で、油井管の現地施工、あるいは各種建設工事の現地に
おける鋼管や鋼棒等の接合に適している。そして本発明
法の採用により、接合部の両側の母材の材質劣化を抑え
た加熱が、小型の電源を使用する誘導加熱で行うことが
できる。Diffusion bonding with an amorphous metal foil as shown in FIG. 1 can be performed at low cost and easily as compared with other bonding means such as MIG welding, TIG welding or pressure welding. It is suitable for joining steel pipes, steel rods, etc. at the site of construction or various construction works. By adopting the method of the present invention, the heating that suppresses the deterioration of the material of the base material on both sides of the joint can be performed by induction heating using a small power source.
【００１８】つぎに本発明装置は、図１に示すように、
加熱部位４を囲むワークコイル５を有し、かつワークコ
イル５で囲まれた部位の内の加熱部位４から外れた部位
とワークコイル５との間に冷却媒体噴射装置６が配設さ
れ、加熱部位４と冷却媒体噴射部位との境界に被加熱材
を囲繞する仕切り板８が設けられている。ワークコイル
５は、巻線１０をガラスウールで巻いて絶縁し、さらに
耐火モルタル、耐火セメントなどの耐火物でコーティン
グして保護している。また加熱効率を上げるために断熱
材を被覆している。仕切り板８は耐熱材からなり、耐熱
ゴムなどの弾性体とするのが好ましい。このような本発
明装置の作用は、上記本発明法で詳述したとおりであ
る。Next, the apparatus according to the present invention, as shown in FIG.
A cooling medium ejecting device 6 is provided between the work coil 5 and a portion of the portion surrounded by the work coil 5 that has the work coil 5 surrounding the heating portion 4 and is separated from the work portion 5. A partition plate 8 surrounding the material to be heated is provided at a boundary between the portion 4 and the cooling medium injection portion. In the work coil 5, the winding 10 is wound with glass wool to be insulated, and further protected by coating with a refractory material such as refractory mortar or refractory cement. Also, a heat insulating material is coated to increase the heating efficiency. The partition plate 8 is made of a heat-resistant material, and is preferably an elastic body such as heat-resistant rubber. The operation of the device of the present invention is as described in detail in the method of the present invention.
【００１９】なお、本発明において、被加熱材１として
は上記のような断面円形のものに限らず、角形等各種形
状のものにも適用することができる。その場合、巻線１
０の形状は被加熱材１の形状に合わせたものとする。In the present invention, the material to be heated 1 is not limited to the above-described circular shape in cross section, but may be applied to various shapes such as a square shape. In that case, winding 1
The shape of 0 corresponds to the shape of the material 1 to be heated.
【００２０】[0020]
本発明例：図１に示すような本発明装置を使用し、本発
明法により鋼管同士を拡散接合した。鋼管は JIS G 344
4 に規定されるＳＴＫ４００、外径２６４．４mm、内径
２２８．８mm、肉厚１７．８mmである。両鋼管の管端に
は、図１に示すような傾斜角４５°の凸テーパおよび凹
テーパを加工し、非晶質金属箔を挟んで嵌合させ、約９
００kgの荷重をかけて加熱した。非晶質金属箔は、Ｆｅ
−９wt％Ｓｉ−１．５wt％Ｂからなる組成のもので、厚
さは３０μｍである。Example of the present invention: Using the apparatus of the present invention as shown in FIG. 1, steel pipes were diffusion-bonded by the method of the present invention. Steel pipe is JIS G 344
STK400, outer diameter 264.4 mm, inner diameter 228.8 mm, and wall thickness 17.8 mm, which are specified in 4 above. A convex taper and a concave taper having an inclination angle of 45 ° as shown in FIG. 1 were machined at the pipe ends of both steel pipes, and fitted with an amorphous metal foil interposed therebetween.
Heat was applied with a load of 00 kg. The amorphous metal foil is made of Fe
It has a composition of −9 wt% Si and 1.5 wt% B, and has a thickness of 30 μm.
【００２１】ワークコイル５は、内径３５０mmφ、長さ
２００mm、巻数１０巻である。冷却媒体噴射装置６は、
内径２９０mmφ、外径３２０mmφ、長さ４００mmであ
り、両冷却媒体噴射装置６の間隔は４０mmとした。この
４０mmの範囲を加熱部位４とし、図１のように加熱部位
４の中央に接合部３を位置させた。そして、耐火ゴム製
のリング状仕切り板８を図１のように装着し、また、加
熱部位４を覆う断熱材９として、初期厚さ１５mmの円筒
状のセラミックファイバーを鋼管に装着した。The work coil 5 has an inner diameter of 350 mm, a length of 200 mm, and 10 turns. The cooling medium injection device 6 includes:
The inner diameter was 290 mmφ, the outer diameter was 320 mmφ, the length was 400 mm, and the interval between the two cooling medium jetting devices 6 was 40 mm. The range of 40 mm was defined as the heating portion 4, and the joint 3 was positioned at the center of the heating portion 4 as shown in FIG. Then, a ring-shaped partition plate 8 made of fire-resistant rubber was attached as shown in FIG. 1, and a cylindrical ceramic fiber having an initial thickness of 15 mm was attached to a steel pipe as a heat insulating material 9 covering the heating portion 4.
【００２２】ワークコイル５に接続した電源は、最高出
力５０kW、周波数８kHz の小容量、小型の高周波電源で
ある。この電源により、二次側電力を４０kW（７００
Ｖ，６０Ａ，効率９５％）として誘導加熱し、およそ２
℃／秒の昇温速度で１２００℃に加熱し５分保定後、電
源を切って冷却した。加熱時および加熱終了後も継続し
て、冷却媒体噴射装置６に千鳥配置にした噴射孔７か
ら、１００リッター／ｍ2・min の水量密度で水を噴射
した。The power supply connected to the work coil 5 is a small-sized, high-frequency power supply with a maximum output of 50 kW and a frequency of 8 kHz. With this power source, the secondary power is reduced to 40 kW (700
V, 60A, 95% efficiency)
After heating to 1200 ° C. at a temperature rising rate of ° C./sec and holding for 5 minutes, the power was turned off and cooled. At the time of heating and after the end of heating, water was injected at a water density of 100 liter / m 2 · min from the injection holes 7 arranged in a staggered manner in the cooling medium injection device 6.
【００２３】比較例：図１において冷却媒体噴射装置６
を使用せず、その他の条件は本発明例１と同様にして鋼
管を接合した。Comparative Example: FIG. 1 shows a cooling medium injection device 6
Was used, and the other conditions were the same as in Example 1 of the present invention to join steel pipes.
【００２４】上記本発明例および比較例について、接合
後、円周方向に８分割したサンプルから、それぞれ接合
部３を中央部にして引張試験片を採取し、引張試験を行
った。その結果、引張強度はいずれも４００MPa 以上を
示し、接合強度はいずれも良好で差が見られなかった
が、０．２％耐力に差が認められ、 本発明例・・・３１０〜３３０MPa 比較例・・・・２３０〜２６０MPa であった。熱影響を受けない母材の０．２％耐力は３５
０MPa 程度であるから、比較例では、熱影響による母材
の強度低下が大きかったのに対し、本発明例では強度低
下を抑えることができた。With respect to the above examples of the present invention and comparative examples, after the joining, tensile test pieces were taken from the samples divided into eight pieces in the circumferential direction with the joint 3 at the center, and subjected to a tensile test. As a result, the tensile strength was 400 MPa or more in each case, and the joining strength was good and no difference was observed. However, a difference was observed in the 0.2% proof stress. ... 230 to 260 MPa. The 0.2% proof stress of the base material not affected by heat is 35
Since the pressure is about 0 MPa, in the comparative example, the strength decrease of the base material due to the heat effect was large, whereas in the present invention example, the strength decrease was able to be suppressed.
【００２５】[0025]
【発明の効果】本発明は、鋼管等の金属管同士あるいは
棒鋼等の金属棒同士を長さ方向に突合せ接合する場合等
において、接合時の加熱あるいは接合後の熱処理等、長
さ方向の制限された部位を誘導加熱するための方法およ
び装置であって、ワークコイルの巻線範囲を狭めること
なく、狭い範囲の加熱部位を選択的に加熱できるので、
巻線密度を絶縁維持に問題のない範囲とし、かつ巻数を
減じる必要がないので、電源の大容量化、大型化を要し
ない。そして、制限された狭い範囲の加熱部位を所要温
度に加熱し、加熱部位をはずれた部位では母材の強度低
下などの材質劣化を抑制することができる。According to the present invention, in the case where metal pipes such as steel pipes or metal rods such as steel bars are butt-joined in the longitudinal direction, the lengthwise restriction such as heating at the time of joining or heat treatment after joining is performed. A method and apparatus for induction heating of a part that has been heated without narrowing the winding range of the work coil, because it is possible to selectively heat a narrow part of the heated part,
Since the winding density is set within a range where there is no problem in maintaining the insulation and the number of turns does not need to be reduced, it is not necessary to increase the capacity and size of the power supply. Then, it is possible to heat the heated portion in a limited narrow range to a required temperature, and to suppress the material deterioration such as a decrease in the strength of the base material in the portion outside the heated portion.
【００２６】また、誘導加熱終了後の急冷を行うことも
できる。加熱後の急冷により、接合部および母材の材質
劣化が抑制されるほか、加熱部位が常温になるまでの時
間が短縮され、接合作業の効率向上にも繋がる。したが
って、油井管の現地施工、あるいは各種建設工事の現地
における鋼管や鋼棒等の接合や熱処理に適している。Further, rapid cooling after the completion of induction heating can be performed. Due to the rapid cooling after heating, deterioration of the material of the joint and the base material is suppressed, and the time required for the heated portion to reach room temperature is shortened, which leads to an improvement in the efficiency of the joining operation. Therefore, it is suitable for the on-site construction of oil country tubular goods or the joining and heat treatment of steel pipes, steel rods, and the like at the site of various construction works.
【図１】本発明法および装置の例を示す断面図である。FIG. 1 is a cross-sectional view illustrating an example of the method and apparatus of the present invention.
１，２…金属管 ３…接合部 ４…加熱部位 ５…ワークコイル ６…冷却媒体噴射装置 ７…噴射孔 ８…仕切り板 ９…断熱材 １０…巻線 Reference numerals 1, 2, metal pipe 3, joint 4, heating part 5, work coil 6, cooling medium injection device 7, injection hole 8, partition plate 9, heat insulating material 10, winding
Claims (2)
れた部位を誘導加熱する方法であって、加熱部位をワー
クコイルで囲み、かつ該ワークコイルで囲まれた部位の
内の該加熱部位から外れた部位と該ワークコイルとの間
に冷却媒体噴射装置を配設することにより、該加熱部位
から外れた部位を冷却することを特徴とする誘導加熱
法。1. A method for inductively heating a limited portion in a longitudinal direction of a metal tube or a metal rod, wherein the heated portion is surrounded by a work coil, and the heating is performed in the portion surrounded by the work coil. An induction heating method, wherein a cooling medium ejecting device is disposed between a part deviating from the part and the work coil to cool the part deviating from the heating part.
れた部位を誘導加熱する装置であって、加熱部位を囲む
ワークコイルを有し、かつ該ワークコイルで囲まれた部
位の内の該加熱部位から外れた部位と該ワークコイルと
の間に冷却媒体噴射装置が配設され、該加熱部位と冷却
媒体噴射部位との境界に被加熱材を囲繞する仕切り板が
設けられていることを特徴とする誘導加熱装置。2. A device for inductively heating a limited portion in a longitudinal direction of a metal tube or a metal rod, comprising a work coil surrounding a heated portion, and a work coil surrounded by the work coil. A cooling medium ejecting device is provided between the portion deviated from the heating portion and the work coil, and a partition plate surrounding the material to be heated is provided at a boundary between the heating portion and the cooling medium ejecting portion. An induction heating device characterized by the above-mentioned.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22903296A JP3694365B2 (en) | 1996-08-29 | 1996-08-29 | Induction heating diffusion bonding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22903296A JP3694365B2 (en) | 1996-08-29 | 1996-08-29 | Induction heating diffusion bonding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1069977A true JPH1069977A (en) | 1998-03-10 |
| JP3694365B2 JP3694365B2 (en) | 2005-09-14 |
Family
ID=16885684
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22903296A Expired - Fee Related JP3694365B2 (en) | 1996-08-29 | 1996-08-29 | Induction heating diffusion bonding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3694365B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102658408A (en) * | 2012-04-20 | 2012-09-12 | 绍兴亨特铝热交换技术有限公司 | Method for brazing aluminum pipe joint |
| JP2017087255A (en) * | 2015-11-09 | 2017-05-25 | 康平 谷 | Joining method of metal |
| CN108085477A (en) * | 2017-12-16 | 2018-05-29 | 武汉华夏精冲技术有限公司 | A kind of improved thin annulus part quenching partition plate and its processing method |
| CN111390322A (en) * | 2020-03-30 | 2020-07-10 | 南昌航空大学 | T L P conduit welding fixture device capable of adding temperature gradient and welding method |
-
1996
- 1996-08-29 JP JP22903296A patent/JP3694365B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102658408A (en) * | 2012-04-20 | 2012-09-12 | 绍兴亨特铝热交换技术有限公司 | Method for brazing aluminum pipe joint |
| JP2017087255A (en) * | 2015-11-09 | 2017-05-25 | 康平 谷 | Joining method of metal |
| CN108085477A (en) * | 2017-12-16 | 2018-05-29 | 武汉华夏精冲技术有限公司 | A kind of improved thin annulus part quenching partition plate and its processing method |
| CN111390322A (en) * | 2020-03-30 | 2020-07-10 | 南昌航空大学 | T L P conduit welding fixture device capable of adding temperature gradient and welding method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3694365B2 (en) | 2005-09-14 |
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