JP2876048B2 - High frequency brazing method - Google Patents
High frequency brazing methodInfo
- Publication number
- JP2876048B2 JP2876048B2 JP14005293A JP14005293A JP2876048B2 JP 2876048 B2 JP2876048 B2 JP 2876048B2 JP 14005293 A JP14005293 A JP 14005293A JP 14005293 A JP14005293 A JP 14005293A JP 2876048 B2 JP2876048 B2 JP 2876048B2
- Authority
- JP
- Japan
- Prior art keywords
- cylinder
- frequency
- current resistance
- inner cylinder
- frequency induction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Pressure Welding/Diffusion-Bonding (AREA)
- General Induction Heating (AREA)
- Heat Treatment Of Articles (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、銅系材料とステンレス
鋼のように高周波誘導特性が異なる異種材料により構成
された２重筒体の製造に使用される高周波ロウ付け方法
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high frequency brazing method used for manufacturing a double cylinder made of different materials having different high frequency induction characteristics, such as a copper-based material and stainless steel.
【０００２】[0002]
【従来の技術】熱交換器等では、熱伝導性に優れた銅系
の筒体を、耐食性に優れたステンレス鋼からなる筒体の
外面にロウ付けした２重筒体を使用することがある。こ
のような異材２重筒体は、例えば、高周波ロウ付けによ
って製造される。この製造法を図１により説明する。2. Description of the Related Art In a heat exchanger or the like, a double cylinder in which a copper-based cylinder having excellent heat conductivity is brazed to an outer surface of a stainless steel cylinder having excellent corrosion resistance may be used. . Such a dissimilar material double cylinder is manufactured by, for example, high frequency brazing. This manufacturing method will be described with reference to FIG.
【０００３】まず、ステンレス鋼からなる内筒１０と、
銅系材料からなる外筒２０の間にロウ材を挟んで、これ
らを２重に重ね合わせる。次いで、この重合体を高周波
誘導加熱コイル３０の内側に位置させて、高周波誘導加
熱コイル３０により外側から加熱する。First, an inner cylinder 10 made of stainless steel,
A brazing material is sandwiched between outer cylinders 20 made of a copper-based material, and these are superimposed twice. Next, the polymer is positioned inside the high-frequency induction heating coil 30 and is heated from the outside by the high-frequency induction heating coil 30.
【０００４】[0004]
【発明が解決しようとする課題】このような高周波ロウ
付けでは、内筒１０を構成するステンレス鋼の高周波誘
導電流抵抗が、外筒２０を構成する銅系材料のそれより
大きいために、外筒２０より先に内筒１０が加熱され、
内筒１０と外筒２０の間に挟まれたロウ材の融点に、外
筒２０が達する前に、内筒１０がその融点を遙かに超え
る高温に達し、フラックスの酸化や内筒１０および外筒
２０がロウ付け適性温度に維持されないことにより、接
合面積率が低くなるという問題がある。その結果、例え
ば熱交換器に使用される２重筒体では伝熱効率の低下を
招くことになる。In such a high-frequency brazing, since the high-frequency induced current resistance of the stainless steel forming the inner cylinder 10 is larger than that of the copper-based material forming the outer cylinder 20, The inner cylinder 10 is heated before 20 and
Before the outer cylinder 20 reaches the melting point of the brazing material sandwiched between the inner cylinder 10 and the outer cylinder 20, the inner cylinder 10 reaches a high temperature far exceeding the melting point, oxidizing the flux and causing the inner cylinder 10 and Since the outer cylinder 20 is not maintained at the proper brazing temperature, there is a problem that the bonding area ratio is reduced. As a result, for example, in a double cylinder used for a heat exchanger, heat transfer efficiency is reduced.
【０００５】本発明の目的は、銅系材料とステンレス鋼
のような高周波誘導電流抵抗が異なる異材２重筒体を均
一に高周波誘導加熱して、優れたロウ付け品質を確保す
る高周波ロウ付け方法を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a high frequency brazing method for uniformly heating a double cylinder having a different high frequency induction current resistance, such as a copper-based material and stainless steel, with a high frequency induction to ensure excellent brazing quality. Is to provide.
【０００６】[0006]
【課題を解決するための手段】本発明の高周波ロウ付け
方法は、高周波誘導電流抵抗の大きい内筒と高周波誘導
電流抵抗の小さい外筒を、高周波誘導加熱コイルにより
外側から高周波誘導加熱してロウ付けする際に、均等開
口部を設けた高周波誘導電流抵抗の大きいダミー筒体の
中に前記外筒および内筒を重ね合わせて挿入し、高周波
誘導電流抵抗の大きい内筒とダミー筒体の間に高周波誘
導電流抵抗の小さい外筒を挟んだ状態で、これらを高周
波誘導加熱することを特徴とする。According to the high frequency brazing method of the present invention, a high frequency induction heating coil heats an inner cylinder having a large high frequency induction current resistance and an outer cylinder having a small high frequency induction current resistance from the outside. At the time of attachment, the outer cylinder and the inner cylinder are overlapped and inserted into a dummy cylinder having a large high-frequency induction current resistance provided with a uniform opening, so that a gap between the inner cylinder and the dummy cylinder having a high high-frequency induction current resistance is provided. These are characterized by high-frequency induction heating of an outer cylinder having a small high-frequency induced current resistance.
【０００７】[0007]
【作用】高周波誘導加熱コイルにより生じた磁界によ
り、高周波誘導電流抵抗の大きい内筒とダミー筒体が優
先的に誘導加熱される。内筒とダミー筒体に挟まれた外
筒はそれ自体の誘導加熱は少ないが、外側および内側か
らの伝熱により加熱され、内筒とほぼ同じ速度で昇温
し、適正なロウ付け温度に維持される。The magnetic field generated by the high-frequency induction heating coil preferentially heats the inner cylinder and the dummy cylinder having a high high-frequency induction current resistance. The outer cylinder sandwiched between the inner cylinder and the dummy cylinder has little induction heating itself, but is heated by heat transfer from the outside and inside, and heats up at almost the same speed as the inner cylinder to reach the proper brazing temperature. Will be maintained.
【０００８】ここで、ダミー筒体に設けた均等開口部は
高周波誘導電流抵抗の大きい内筒を加熱コイルで加熱す
る機能を有し、これがない場合は内筒部の昇温速度が遅
れ、内筒、外筒が同じ速度で昇温しなくなる。開口部の
個々の面積はダミー筒体の全面積の３〜５％が望まし
く、またその面積の総和はダミー筒体の全面積の４０〜
６０％が望ましい。Here, the uniform opening provided in the dummy cylinder has a function of heating the inner cylinder having a large high-frequency induced current resistance with a heating coil. The cylinder and outer cylinder do not heat at the same rate. The area of each opening is desirably 3 to 5% of the total area of the dummy cylinder, and the total area is 40 to 50% of the total area of the dummy cylinder.
60% is desirable.
【０００９】[0009]
【実施例】以下に本発明の実施例を図面に基づいて説明
する。Embodiments of the present invention will be described below with reference to the drawings.
【００１０】本発明の高周波ロウ付け方法は、例えば、
図２に示すように、ステンレス鋼からなる内筒１０と、
銅または銅合金からなる外筒２０のロウ付けに使用され
る。The high-frequency brazing method according to the present invention includes, for example,
As shown in FIG. 2, an inner cylinder 10 made of stainless steel,
Used for brazing the outer cylinder 20 made of copper or a copper alloy.
【００１１】ロウ付けに際しては、まず、内筒１０と外
筒２０の間にロウ材を挟んで、これらを重ね合わせる。
次いで、その重合体をダミー筒体４０の中に挿入して、
これらを高周波誘導コイル３０により外側から加熱す
る。At the time of brazing, first, a brazing material is sandwiched between the inner cylinder 10 and the outer cylinder 20, and these are overlapped.
Next, the polymer is inserted into the dummy cylinder 40,
These are heated from the outside by the high frequency induction coil 30.
【００１２】ダミー筒体４０は、内筒１０と同じステン
レス鋼からなり、その脱着を容易にするため円周方向に
２分割された２ピース構造とされ、ヒンジによる開閉構
造を採用している。The dummy cylinder 40 is made of the same stainless steel as the inner cylinder 10, has a two-piece structure divided into two parts in the circumferential direction in order to facilitate its attachment and detachment, and employs a hinged opening and closing structure.
【００１３】ダミー筒体４０には、円形をした多数の開
口部４１が、周面全体にわたって均一な密度で設けられ
ている。開口部４１が小さすぎる場合は、内筒昇温速度
が遅れ、逆に大きすぎる場合は、外筒昇温速度が遅くな
る。従って、前述した通り、開口部４１の面積は、ダミ
ー筒体４０の全面積の３〜５％が望ましく、またその面
積の総和はダミー筒体４０の全面積の４０〜６０％が望
ましい。A large number of circular openings 41 are provided in the dummy cylinder 40 at a uniform density over the entire peripheral surface. If the opening 41 is too small, the heating speed of the inner cylinder will be delayed, and if it is too large, the heating speed of the outer cylinder will be slow. Therefore, as described above, the area of the opening 41 is desirably 3 to 5% of the entire area of the dummy cylinder 40, and the sum of the areas is desirably 40 to 60% of the entire area of the dummy cylinder 40.
【００１４】ダミー筒体４０の材質は、内筒１０と必ず
しも同一である必要はなく、内筒１０と同程度に高周波
誘導電流抵抗が大きいものであればよい。The material of the dummy cylinder 40 does not necessarily have to be the same as that of the inner cylinder 10 and may be any material having a high-frequency induced current resistance as large as that of the inner cylinder 10.
【００１５】ダミー筒体４０の直径は、その内面が外筒
２０の外面に全周にわたって密着するように決定する必
要がある。The diameter of the dummy cylinder 40 must be determined so that its inner surface is in close contact with the outer surface of the outer cylinder 20 over the entire circumference.
【００１６】ダミー筒体４０の厚みは、内筒１０、外筒
２０のヒートマスによって適宜決定される。The thickness of the dummy cylinder 40 is appropriately determined by the heat mass of the inner cylinder 10 and the outer cylinder 20.
【００１７】このようなダミー筒体４０を使用すれば、
高周波誘導加熱コイル３０により、高周波誘導電流抵抗
の大きい内筒１０とダミー筒体４０が優先的に加熱さ
れ、その加熱された内筒１０とダミー筒体４０により、
外筒２０が内外から加熱される。その結果、高周波誘導
電流抵抗の小さい外筒２０の加熱が促進され、内筒１０
および外筒２０が同程度の速度で温度上昇し、適正なロ
ウ付け温度に維持される。If such a dummy cylinder 40 is used,
The high-frequency induction heating coil 30 preferentially heats the inner cylinder 10 and the dummy cylinder 40 having a large high-frequency induction current resistance, and the heated inner cylinder 10 and the dummy cylinder 40
The outer cylinder 20 is heated from inside and outside. As a result, heating of the outer cylinder 20 having a small high-frequency induced current resistance is promoted, and the inner cylinder 10 is heated.
And the temperature of the outer cylinder 20 rises at the same speed, and is maintained at an appropriate brazing temperature.
【００１８】[0018]
【発明の効果】以上の説明から明らかなように、本発明
の高周波ロウ付け方法は、高周波誘導電流抵抗の大きい
ダミー筒体を使用することにより、高周波誘導電流抵抗
の小さい外筒を、高周波誘導電流抵抗の大きい内筒と同
程度に加熱し、両方の筒体を適正なロウ付け温度に保つ
ことができる。従って、内筒と外筒の高周波誘導電流抵
抗が相違するにもかかわらず、両筒体が充分な接合面積
率をもってロウ付けされる。As is apparent from the above description, the high-frequency brazing method of the present invention uses a dummy cylinder having a large high-frequency induction current resistance to convert an outer cylinder having a low high-frequency induction current resistance into a high-frequency induction current. Heating is performed to the same degree as that of the inner cylinder having a large current resistance, and both the cylinders can be maintained at an appropriate brazing temperature. Therefore, despite the difference in the high-frequency induced current resistance between the inner cylinder and the outer cylinder, the two cylinders are brazed with a sufficient joint area ratio.
【図１】従来の高周波ロウ付け方法を示す断面図であ
る。FIG. 1 is a cross-sectional view illustrating a conventional high-frequency brazing method.
【図２】本発明の高周波ロウ付け方法を示す断面図であ
る。FIG. 2 is a sectional view showing a high-frequency brazing method according to the present invention.
１０ 内筒 ２０ 外筒 ３０ 高周波誘導加熱コイル ４０ ダミー筒体 ４１ 開口部 DESCRIPTION OF SYMBOLS 10 Inner cylinder 20 Outer cylinder 30 High frequency induction heating coil 40 Dummy cylinder 41 Opening
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) B23K 1/002 B21C 37/06 B23K 1/18 B23K 1/19 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 6 , DB name) B23K 1/002 B21C 37/06 B23K 1/18 B23K 1/19
Claims (1)
波誘導電流抵抗の小さい外筒を、高周波誘導加熱コイル
により外側から高周波誘導加熱してロウ付けする際に、
均等開口部を設けた高周波誘導電流抵抗の大きいダミー
筒体の中に前記外筒および内筒を重ね合わせて挿入し、
高周波誘導電流抵抗の大きい内筒とダミー筒体の間に高
周波誘導電流抵抗の小さい外筒を挟んだ状態で、これら
を高周波誘導加熱することを特徴とする高周波ロウ付け
方法。When a high-frequency induction heating coil brazes an inner cylinder having a large high-frequency induction current resistance and an outer cylinder having a small high-frequency induction current resistance from the outside,
The outer cylinder and the inner cylinder are overlapped and inserted into a large dummy cylinder having a high-frequency induced current resistance provided with a uniform opening,
A high-frequency brazing method characterized in that high-frequency induction heating is performed on an outer cylinder having a small high-frequency induced current resistance between an inner cylinder having a large high-frequency induced current resistance and a dummy cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14005293A JP2876048B2 (en) | 1993-05-18 | 1993-05-18 | High frequency brazing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14005293A JP2876048B2 (en) | 1993-05-18 | 1993-05-18 | High frequency brazing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06328235A JPH06328235A (en) | 1994-11-29 |
| JP2876048B2 true JP2876048B2 (en) | 1999-03-31 |
Family
ID=15259871
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14005293A Expired - Fee Related JP2876048B2 (en) | 1993-05-18 | 1993-05-18 | High frequency brazing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2876048B2 (en) |
-
1993
- 1993-05-18 JP JP14005293A patent/JP2876048B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06328235A (en) | 1994-11-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| LAPS | Cancellation because of no payment of annual fees |