JPH0354028B2 - - Google Patents

Info

Publication number
JPH0354028B2
JPH0354028B2 JP59242676A JP24267684A JPH0354028B2 JP H0354028 B2 JPH0354028 B2 JP H0354028B2 JP 59242676 A JP59242676 A JP 59242676A JP 24267684 A JP24267684 A JP 24267684A JP H0354028 B2 JPH0354028 B2 JP H0354028B2
Authority
JP
Japan
Prior art keywords
solder
tube
tubes
metal
aluminum
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 - Lifetime
Application number
JP59242676A
Other languages
Japanese (ja)
Other versions
JPS61123464A (en
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed filed Critical
Priority to JP24267684A priority Critical patent/JPS61123464A/en
Publication of JPS61123464A publication Critical patent/JPS61123464A/en
Publication of JPH0354028B2 publication Critical patent/JPH0354028B2/ja
Granted legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K1/00Soldering, e.g. brazing, or unsoldering
    • B23K1/14Soldering, e.g. brazing, or unsoldering specially adapted for soldering seams
    • B23K1/18Soldering, e.g. brazing, or unsoldering specially adapted for soldering seams circumferential seams, e.g. of shells

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Non-Disconnectible Joints And Screw-Threaded Joints (AREA)

Description

【発明の詳細な説明】 〔発明の技術分野〕 本発明は例えば冷蔵庫においてアルミニウム製
冷却器の冷媒管に銅管を接続するような場合に用
いられる金属管の接続方法に関する。
DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for connecting metal tubes used, for example, when connecting a copper tube to a refrigerant tube of an aluminum cooler in a refrigerator.

〔発明の技術的背景とその問題点〕[Technical background of the invention and its problems]

例えば冷蔵庫において、その冷凍サイクル用配
管は、銅、アルミニウム及び鉄等の素材で構成さ
れ、夫々の材質に適した接合法で接続している。
このうち銅管とアルミニウム管(冷却器の冷媒
管)との接続については、従来、短尺な銅管とア
ルミニウム管とをフラツシユ溶接又はバツト溶接
或は爆発圧接した継手を使用していた。しかしな
がら、この継手は高価で、且つ継手のアルミニウ
ム管と冷却器のアルミニウム管とを接続する際に
は高度の技能を必要とするTIG溶接を行わねばな
らない。斯る問題を解消する接続方法として、銅
管とアルミニウム管とを嵌合してはんだにより接
合するようにしたものがある。この方法は、予め
銅管の端部外周面及び拡径されたアルミニウム管
の端部内周面にはんだを付着させておき、そして
銅管端部をアルミニウム管端部の内側にあらかじ
め嵌合し、この嵌合状態の下で銅管側から超音波
振動を印加しつつはんだを加熱溶融せしめて両管
を接合するというものである。しかしながら、こ
の方法では、両管に予めはんだが付着されている
ため、両者を嵌合するにはアルミニウム管の端部
を相当大きく拡径しておかねばならず、これがた
めに銅管とアルミニウム管とのクリアランスが大
きくなり、接合強度上好ましくなく、又多量のは
んだを必要とする上に嵌合部分の全体にはんだが
充填されにくく冷媒洩れの原因となる虞れがあ
る。
For example, in a refrigerator, the refrigeration cycle piping is made of materials such as copper, aluminum, and iron, and is connected by a joining method suitable for each material.
Conventionally, for connecting copper pipes and aluminum pipes (refrigerant pipes of coolers), joints in which short copper pipes and aluminum pipes are flash welded, butt welded, or explosively welded have been used. However, this joint is expensive and requires TIG welding, which requires a high level of skill, when connecting the aluminum pipe of the joint and the aluminum pipe of the cooler. As a connection method to solve this problem, there is a method in which a copper tube and an aluminum tube are fitted and joined by soldering. In this method, solder is applied in advance to the outer circumferential surface of the end of the copper tube and the inner circumferential surface of the end of the enlarged diameter aluminum tube, and the copper tube end is fitted inside the aluminum tube end in advance. In this fitted state, the solder is heated and melted while applying ultrasonic vibrations from the copper tube side, thereby joining the two tubes. However, with this method, since solder is applied to both tubes in advance, the end of the aluminum tube must be enlarged considerably in diameter in order to fit them together, and this results in This increases the clearance between the fitting part and the fitting part, which is unfavorable in terms of joint strength, requires a large amount of solder, and makes it difficult to fill the entire fitting part with solder, which may cause refrigerant leakage.

[発明の目的] 本発明は上記の事情に鑑みてなされたもので、
その目的は、二本の金属管を嵌合してはんだによ
り接合する方法において、接合強度が強く、又は
んだの使用量も少ない上に嵌合部分の全体にはん
だが充填されて冷媒洩れを生ずる虞れがない金属
管の接続方法を提供するにある。
[Object of the invention] The present invention has been made in view of the above circumstances, and
The purpose of this method is to provide a method of fitting two metal tubes and joining them with solder, which provides strong joint strength and requires less solder, and the entire fitting part is filled with solder, which causes refrigerant leakage. The purpose of the present invention is to provide a method for connecting metal pipes without any risk.

〔発明の概要〕[Summary of the invention]

本発明は、端部の外周面にはんだを付着した第
1の金属管と端部に形成された拡径部の内周面に
はんだを付着しそのはんだ付着内周面の内径を第
1の金属管のはんだ付着外周面の外径よりも小さ
くした第2の金属管とを接続するものにあつて、
第1及び第2の金属管を嵌合する前工程で両管の
端部に予め付着されてるはんだを加熱溶融せし
め、はんだの溶融時に両金属管に超音波振動を印
加しながら加圧して両管の端部を互に挿圧嵌合さ
せ更に第1の金属管の先端を第2の金属管の拡径
部よりも奥方まで挿圧して該拡径部の奥方部分を
拡径させたものであり、以て両管を密に接合せし
めることができて接合強度の向上及びはんだ使用
量の減少化を図り得ると共に、超音波振動により
はんだが嵌合部分の全体に充填されて流体の洩れ
を確実に防止し、併せて両金属管の嵌合部分のう
ちその下端部分を加熱することにより、金属管の
嵌込みによりはんだが嵌合部分からかき出されて
もこれが水滴状に固化することのないようにした
ものである。
The present invention includes a first metal tube with solder attached to the outer circumferential surface of the end, solder attached to the inner circumferential surface of an enlarged diameter portion formed at the end, and an inner diameter of the inner circumferential surface to which the solder is attached to the first metal tube. For connecting a second metal tube whose outer diameter is smaller than the outer diameter of the solder-applied outer circumferential surface of the metal tube,
In the process before fitting the first and second metal tubes together, the solder attached to the ends of both tubes is heated and melted, and when the solder is melted, pressure is applied while applying ultrasonic vibrations to both metal tubes. The end portions of the tubes are press-fitted to each other, and the tip of the first metal tube is further pressurized to the depths of the enlarged diameter portion of the second metal tube, thereby expanding the diameter of the inner portion of the enlarged diameter portion. As a result, the two pipes can be tightly joined, improving the joint strength and reducing the amount of solder used.In addition, the ultrasonic vibration fills the entire mating part with solder, preventing fluid leakage. At the same time, by heating the lower end of the fitting portion of both metal tubes, even if the solder is scraped out of the fitting portion by fitting the metal tubes, it will not solidify into water droplets. This was done so that there would be no

〔発明の実施例〕[Embodiments of the invention]

以下本発明の一実施例を図面に基づいて説明す
る。
An embodiment of the present invention will be described below based on the drawings.

まず第1図及び第2図は互い接続される第1の
金属管たる銅管1と第2の金属管たるアルミニウ
ム管2(冷却器の冷媒管)とを示す。この銅管1
の先端部は漸次径小となるようにテーパ状に絞込
まれている。他方アルミニウム管2の端部は拡径
され且つその拡径部2aの先端部が漸次径大とな
るようにテーパ状に拡げられている。この場合、
拡径部2aの内径寸法Aは銅管1の外径寸法Bと
同等もしくはこれよりも僅かに小さく設定してお
り、本実施例ではA寸法は上記B寸法より約0.05
〜0.1mm小さく設定している。これはアルミニウ
ム管2の内周面に後述する所謂超音波はんだめつ
きを行なう際にアルミニウム管2がその超音波に
より浸食されるため、その浸食厚さ分(約0.05〜
0.1mm)を見込んで、その分小さく設定したもの
である。又、拡径部2aの長さ寸法Cは、銅管1
とアルミニウム管2とを後述のようにして嵌合し
たときのその嵌合長さ寸法D(第10図参照)よ
りもやや短く設定している。次に第3図及び第4
図は夫々銅管1及びアルミニウム管2にはんだを
付着させるための超音波はんだめつき装置を示す
もので、ヒータ3を備えたはんだの浴槽4内には
超音波振動子5に連結された振動板6が設けられ
ている。又、浴槽4内の溶融はんだ7に浸漬され
る銅管1、アルミニウム管2は、夫々電磁弁8,
9を介してエアコンプレツサ(図示せず)に連結
されたブローパイプ10,11に接続するように
なつている。そして、銅管1側のブローパイプ1
0は減圧弁12を介してもエアコンプレツサに連
結され、他方アルミニウム管2側のブローパイプ
11は小孔11aの形成により大気に開放されて
いる。ちなみに、はんだ7としてはZn95%、Al5
%のアルミニウム用はんだを使用し、はんだ7の
加熱温度は銅管1側で約415℃、アルミニウム管
2側で約440℃を維持するように調節される。而
して、第5図は管接続装置を示すもので、アルミ
ニウム管2を保持するホルダー13の上方に銅管
1を保持する加圧治具14が上下動可能に設けら
れ、更にこの加圧治具14の上部に超音波振動子
15が設けられている。又、これらホルダー13
と加圧治具14との間には銅管1及びアルミニウ
ム管2の端部及びアルミニウム管2の拡径部2a
下部を加熱するためのガスバーナ16乃至18が
上下三段に夫々複数本ずつ設けられている。
First, FIGS. 1 and 2 show a copper tube 1 as a first metal tube and an aluminum tube 2 (refrigerant tube of a cooler) as a second metal tube that are connected to each other. This copper pipe 1
The tip is tapered so that the diameter gradually decreases. On the other hand, the end of the aluminum tube 2 is expanded in diameter, and the tip of the expanded diameter portion 2a is expanded in a tapered shape so that the diameter gradually increases. in this case,
The inner diameter dimension A of the enlarged diameter portion 2a is set to be equal to or slightly smaller than the outer diameter dimension B of the copper tube 1, and in this embodiment, the A dimension is approximately 0.05 smaller than the above B dimension.
It is set ~0.1mm smaller. This is because the aluminum tube 2 is eroded by the ultrasonic waves when performing so-called ultrasonic soldering, which will be described later, on the inner peripheral surface of the aluminum tube 2.
0.1mm), and set it smaller by that amount. Moreover, the length dimension C of the enlarged diameter portion 2a is the same as that of the copper pipe 1.
The fitting length D (see FIG. 10) is set to be slightly shorter than the fitting length D (see FIG. 10) when the aluminum tube 2 and the aluminum tube 2 are fitted as described below. Next, Figures 3 and 4
The figure shows an ultrasonic soldering device for attaching solder to a copper tube 1 and an aluminum tube 2, respectively, and a solder bath 4 equipped with a heater 3 is connected to an ultrasonic vibrator 5. A diaphragm 6 is provided. Further, the copper pipe 1 and the aluminum pipe 2 immersed in the molten solder 7 in the bathtub 4 are operated by solenoid valves 8 and 2, respectively.
9 to blow pipes 10 and 11 connected to an air compressor (not shown). Then, blow pipe 1 on the copper pipe 1 side
0 is also connected to the air compressor via a pressure reducing valve 12, while the blow pipe 11 on the aluminum pipe 2 side is open to the atmosphere by forming a small hole 11a. By the way, solder 7 is Zn95%, Al5
% aluminum solder is used, and the heating temperature of the solder 7 is adjusted to maintain approximately 415°C on the copper tube 1 side and approximately 440°C on the aluminum tube 2 side. FIG. 5 shows a pipe connecting device in which a pressure jig 14 for holding a copper pipe 1 is provided above a holder 13 for holding an aluminum pipe 2 so as to be movable up and down. An ultrasonic transducer 15 is provided on the top of the jig 14. Also, these holders 13
The end portions of the copper tube 1 and the aluminum tube 2 and the enlarged diameter portion 2a of the aluminum tube 2 are disposed between the pressure jig 14 and the pressure jig 14.
A plurality of gas burners 16 to 18 for heating the lower part are provided in three upper and lower stages.

次に銅管1とアルミニウム管2とを接続する手
順につき説明する。それには、まず両管1,2の
端部にはんだを付着させるわけであるが、これは
銅管1及びアルミニウム管2を夫々ブローパイプ
10及び11に接続し、そして電磁弁8,9を閉
じ且つ超音波振動子5を駆動した状態で第3図及
び第4図に示す如く両管1及び2の端部を溶はん
だ7中に浸漬することによつて行う。すると、銅
管1内には減圧弁12及びブローパイプ10を通
じて低圧の圧縮空気が供給されているため、銅管
1の内圧が高まつてその内部に溶融はんだ7が浸
入することはなく、他方アルミニウム管2内の空
気はブローパイプ11の小孔11aを通じて大気
中に逃出るため、溶融はんだ7がアルミニウム管
2の内部に浸入することになり、結局、銅管1は
端部の外周面だけに溶融はんだ7が付着し、アル
ミニウム管2については端部の内外両周面共に溶
融はんだ7が付着することとなる。このとき溶融
はんだ7には振動板6により超音波(18KHz程
度)が印加されているため、所謂キヤビテーシヨ
ンを起して溶融はんだ7中に無数の小さな真空の
核が生じ、この核が消滅する際の瞬間的な力によ
り銅管1及びアルミニウム管2の表面の汚れや酸
化皮膜が除去され、均一なめつき層を形成すると
共に、超音波により溶融はんだ7の流動性が高ま
り、ぬれを促進してめつき性を向上する。そし
て、この浸漬後両管1及び2を溶融はんだ7中か
ら引上げ、この引上げと同時に電磁弁8,9を開
放し圧縮空気をブローパイプ10,11を通じて
銅管1及びアルミニウム管2から吹出させる。こ
れにより、両管1,2の下端から「しずく」のよ
うに垂下がるはんだを圧縮空気により吹飛ばし、
はんだが「しずく」状に固化して残ることを防止
する。尚、銅管1については接合に必要なはんだ
量を確保するため上述の溶融はんだ7中への浸漬
を更にもう一度行い(二度めの浸漬深さは一度目
よりやや浅くする。)、アルミニウム管2について
は内周面のはんだ付着厚を均一化するために上述
の空気吹出しを二度行うと良い。
Next, the procedure for connecting the copper tube 1 and the aluminum tube 2 will be explained. To do this, first apply solder to the ends of both tubes 1 and 2. This involves connecting the copper tube 1 and aluminum tube 2 to the blow pipes 10 and 11, respectively, and then closing the solenoid valves 8 and 9. This is done by immersing the ends of both tubes 1 and 2 in molten solder 7 as shown in FIGS. 3 and 4 while the ultrasonic vibrator 5 is being driven. Then, since low-pressure compressed air is supplied into the copper pipe 1 through the pressure reducing valve 12 and the blow pipe 10, the internal pressure of the copper pipe 1 increases and the molten solder 7 does not infiltrate into the inside. Since the air inside the aluminum tube 2 escapes into the atmosphere through the small hole 11a of the blow pipe 11, the molten solder 7 enters the inside of the aluminum tube 2, and the copper tube 1 ends up on the outer peripheral surface of the end. The molten solder 7 adheres only to the aluminum tube 2, and the molten solder 7 adheres to both the inner and outer peripheral surfaces of the end of the aluminum tube 2. At this time, since ultrasonic waves (about 18 KHz) are applied to the molten solder 7 by the diaphragm 6, so-called cavitation occurs and countless small vacuum nuclei are generated in the molten solder 7, and when these nuclei disappear, The instantaneous force removes dirt and oxide films on the surfaces of the copper tube 1 and aluminum tube 2, forming a uniform plating layer, and the ultrasonic waves increase the fluidity of the molten solder 7, promoting wetting. Improves plating properties. After this immersion, both tubes 1 and 2 are pulled up from the molten solder 7, and at the same time as they are pulled up, the solenoid valves 8 and 9 are opened to blow compressed air out of the copper tube 1 and the aluminum tube 2 through the blow pipes 10 and 11. As a result, the solder hanging down from the lower ends of both tubes 1 and 2 like "drops" is blown away by compressed air.
Prevents solder from solidifying into "drops" and remaining. In addition, in order to secure the amount of solder necessary for joining, the copper tube 1 is dipped into the molten solder 7 described above once again (the second immersion depth is slightly shallower than the first time), and the aluminum tube Regarding No. 2, it is preferable to perform the above-mentioned air blowing twice in order to equalize the solder adhesion thickness on the inner circumferential surface.

さて、以上のようにして端部に薄いはんだ層1
9及び20が付着された銅管1及びアルミニウム
管2を第5図に示すように夫々加圧治具14及び
ホルダー13に保持して上下に対向させ、そして
加圧治具14を降下させて第6図に示す如く銅管
1の下端をアルミニウム管2の上端に弱い加圧力
でもつて突合わせる。次いでこの突合わせ状態の
下で第7図に示すようにガスバーナ16及び17
により両管1及び2の端部を加熱しそのはんだ層
19及び20を溶融せしめる。尚、このとき銅管
1に加える圧力が大きすぎると、一方のはんだ層
19又は20が溶融した段階で銅管1がアルミニ
ウム管2内に押込まれてしまい、良好なる結合状
態が得られなくなるので、その加圧力は極く弱い
ものとしている。そして、両はんだ層19及び2
0が溶融したところで、ガスバーナ16及び17
による加熱を継続しながら、超音波振動子15を
駆動しつつ加圧治具14により銅管1を強い加圧
力で押下げて該銅管1の端部を第8図のようにア
ルミニウム管2の端部内側に嵌込み、この嵌合
後、ガスバーナ16および17の燃焼を停止させ
る。この嵌合時における銅管1の押下げ量はアル
ミニウム管2の拡径部2aの長さ寸法Cよりもや
や大きくし、これにてアルミニウムよりも強度の
大なる銅管1によつてアルミニウム管2の拡径部
2aの下方部(拡径部2aよりも奥方の部分)を
押広げるようにする。このようにして銅管1の端
部をアルミニウム管2の拡径部2a内に挿圧嵌合
する際、銅管1には超音波振動が付与されている
から、銅管1の外径がアルミニウム管2の内径よ
りも大きくとも、円滑に且つ比較的小さな加圧力
で銅管1をアルミニウム管2内に嵌合でき、また
同様にして比較的小さな加圧力で銅管1の先端に
よりアルミニウム管2の拡径部2aの下方部を押
広げることができる。そして、この銅管1による
アルミニウム管2の拡径により、両管1及び2が
強く接触し、このこととアルミニウム管2の拡径
部2aの内径が銅管1の外径よりも予め小さく設
定されていて、超音波はんだめつき時にアルミニ
ウム管2が侵食されても両管1及び2は極く微小
なクリアランスで密に嵌合されることによつて、
超音波振動子15から銅管1に印加される超音波
振動がアルミニウム管2にも有効に伝わり、そし
てこの超音波振動により両はんだ層19及び20
の溶融はんだが良く混じり合い、しかも銅管1及
びアルミニウム管2に対する溶融はんだのぬれ性
が高まり、両管1及び2間のクリアランス全体に
完全に充填される。そして、両者1及び2の嵌合
後ガスバーナ18に点火して両管1及び2の嵌合
部分の下方部を所定時間加熱し、その後その燃焼
を停止させる。ところで、銅管1をアルミニウム
管2の拡径部2aに嵌込む際、該拡径部2a内周
のはんだは銅管1にしごかれて一部が銅管1とこ
の嵌合部分からかき出されて第8図に示すように
水滴状となる。しかしながら、上述したように両
管1及び2の嵌合部分の下方部をガスバーナ18
によつて加熱するようにしたので、嵌合部分から
かき出されたはんだは、第9図のように溶融状態
のままアルミニウム管2の内周面に薄く膜状に拡
がる。従つて、かき出されたはんだが第8図に示
す如く水滴状となつたまま固化することを防止で
きるので、水滴状に固化したはんだが管路を狭め
て冷媒の流れを阻害したり、実使用時に折れて冷
媒中に混入し冷凍サイクルの開閉弁やコンプレツ
サの動作不良原因になつたりするといつた不都合
を未然に防止できる。
Now, as described above, the thin solder layer 1 is applied to the end.
As shown in FIG. 5, the copper tube 1 and the aluminum tube 2 to which the tubes 9 and 20 are attached are held in a pressure jig 14 and a holder 13 so as to face each other vertically, and then the pressure jig 14 is lowered. As shown in FIG. 6, the lower end of the copper tube 1 is butted against the upper end of the aluminum tube 2 with a weak pressure. Next, under this butt condition, the gas burners 16 and 17 are connected as shown in FIG.
The ends of both tubes 1 and 2 are heated to melt their solder layers 19 and 20. Note that if too much pressure is applied to the copper tube 1 at this time, the copper tube 1 will be pushed into the aluminum tube 2 when one of the solder layers 19 or 20 is melted, and a good bond will not be obtained. , the pressure is assumed to be extremely weak. Then, both solder layers 19 and 2
0 melts, the gas burners 16 and 17
While continuing heating, the ultrasonic vibrator 15 is driven and the pressure jig 14 is used to press down the copper tube 1 with a strong pressing force, and the end of the copper tube 1 is pressed down to the aluminum tube 2 as shown in FIG. After this fitting, combustion of the gas burners 16 and 17 is stopped. The amount by which the copper tube 1 is pressed down during this fitting is made slightly larger than the length dimension C of the enlarged diameter portion 2a of the aluminum tube 2, so that the aluminum tube The lower part of the enlarged diameter part 2a (the part farther back than the enlarged diameter part 2a) of No. 2 is pushed out. When the end of the copper tube 1 is press-fitted into the enlarged diameter portion 2a of the aluminum tube 2 in this way, since ultrasonic vibration is applied to the copper tube 1, the outer diameter of the copper tube 1 is Even if the inner diameter is larger than the inner diameter of the aluminum tube 2, the copper tube 1 can be fitted into the aluminum tube 2 smoothly and with a relatively small pressing force. The lower part of the enlarged diameter part 2a of No. 2 can be pushed out. The expansion of the diameter of the aluminum tube 2 by the copper tube 1 brings the two tubes 1 and 2 into strong contact. Even if the aluminum tube 2 is eroded during ultrasonic soldering, both tubes 1 and 2 are tightly fitted with an extremely small clearance.
The ultrasonic vibrations applied to the copper tube 1 from the ultrasonic vibrator 15 are effectively transmitted to the aluminum tube 2, and due to this ultrasonic vibration, both solder layers 19 and 20
The molten solder mixes well, and the wettability of the molten solder to the copper tube 1 and the aluminum tube 2 increases, and the entire clearance between the tubes 1 and 2 is completely filled. After the pipes 1 and 2 are fitted, the gas burner 18 is ignited to heat the lower part of the fitting portion of the pipes 1 and 2 for a predetermined period of time, and then the combustion is stopped. By the way, when the copper tube 1 is fitted into the enlarged diameter part 2a of the aluminum tube 2, the solder on the inner circumference of the enlarged diameter part 2a is squeezed into the copper tube 1, and a part of it is scraped out from the copper tube 1 and this fitting part. As a result, as shown in FIG. 8, it becomes a water droplet. However, as mentioned above, the gas burner 18
Since the solder is heated by heating, the solder scraped out from the fitted portion spreads in a thin film over the inner circumferential surface of the aluminum tube 2 in a molten state as shown in FIG. Therefore, it is possible to prevent the scraped out solder from solidifying in the form of water droplets as shown in Figure 8, so that the solder solidified in the form of water droplets may narrow the pipes and obstruct the flow of the refrigerant. This prevents the inconvenience of breaking during use and getting mixed into the refrigerant, causing malfunctions of the refrigeration cycle's on-off valve and compressor.

そして、上述の如く両管1及び2を嵌合せしめ
て後、超音波振動の印加及びガスバーナ18によ
る加熱を停止し、自然冷却によりはんだを固化さ
せ、これにて第10図のように銅管1とアルミニ
ウム管2とが接合される。
After fitting both tubes 1 and 2 as described above, application of ultrasonic vibration and heating by the gas burner 18 are stopped, and the solder is solidified by natural cooling. and the aluminum tube 2 are joined.

〔発明の効果〕〔Effect of the invention〕

以上説明したように本発明は、第1の金属管の
端部と第2の金属管の端部の拡径部に予め付着さ
れているはんだを加熱溶融せしめ、この後、両管
に超音波振動を印加しながら加圧して第1の金属
管の端部を第2の金属管の拡径部に挿圧嵌合し更
に第1の金属管の先端を第2の金属管の拡径部よ
りも奥方まで挿圧して該拡径部の奥方を拡径させ
るようにしたので、比較的小さな加圧力で第1の
金属管を第2の金属管に円滑に嵌合してゆくこと
ができると共に、両管を密に嵌合せしめることが
できて接合強度が向上し、しかも両管のクリアラ
ンスが極く小さいのではんだ使用量が減少し且つ
超音波振動によつてはんだが嵌合部分の全体に充
填されるので、流体の洩れを確実に防止できる。
また、両管の嵌合後にその嵌合部分の下方部を加
熱するようにしたので、はんだが嵌合部分からか
き出されても、そのかき出されたはんだは溶融し
て管の内周面に薄く膜状に広がるようになり、従
つてかき出されたはんだが水滴状に固化して管路
を狭めたり、折れて流体中に混入したりする虞れ
がなく、しかもその嵌合部分の下方部の加熱は、
予め両管の端部に付着されたはんだを溶融させる
べく行なう加熱をそのまま続行させるのではな
く、その端部の加熱を停止して新たに加熱するも
のであるから、両管の端部が過熱状態になるとい
つた不都合を防止できる等の優れた効果を奏する
ものである。
As explained above, the present invention heats and melts the solder previously attached to the enlarged diameter portions of the ends of the first metal tube and the ends of the second metal tube, and then applies ultrasonic waves to both tubes. Pressure is applied while applying vibration to fit the end of the first metal tube into the enlarged diameter part of the second metal tube, and then insert the tip of the first metal tube into the enlarged diameter part of the second metal tube. Since the diameter of the enlarged diameter portion is expanded by applying pressure to the inner side of the tube, the first metal tube can be smoothly fitted into the second metal tube with a relatively small pressure force. At the same time, the two tubes can be tightly fitted, improving the joint strength. Furthermore, since the clearance between the two tubes is extremely small, the amount of solder used is reduced, and the ultrasonic vibration spreads the solder over the entire mating area. Since the fluid is filled with water, fluid leakage can be reliably prevented.
In addition, after the two tubes are mated, the lower part of the mating part is heated, so even if the solder is scraped out from the mating part, the scraped solder melts and melts onto the inner peripheral surface of the tube. Therefore, there is no risk that the scraped out solder will harden into water droplets and narrow the pipe, or break and get mixed in with the fluid, and the solder that has been scraped out will not be likely to solidify into droplets and contaminate the fluid. The heating of the lower part is
Rather than continuing heating to melt the solder previously attached to the ends of both tubes, the heating at the ends is stopped and then heated again, so the ends of both tubes do not overheat. This has excellent effects such as being able to prevent inconveniences that would otherwise occur.

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

図面は本発明の一実施例を示すもので、第1図
は銅管及びアルミニウム管の正面図、第2図は同
端部の拡大縦断面図、第3図及び第4図は夫々超
音波はんだめつき装置の縦断面図、第5図は管接
続装置の縦断面図、第6図乃至第10図は接続工
程を順に示す縦断面図である。 図中、1は銅管(第1の金属管)、2はアルミ
ニウム管(第2の金属管)、2aは拡径部、4は
はんだの浴槽、5は超音波振動子、13はホルダ
ー、14は加圧治具、15は超音波振動子、1
6,17はガスバーナ、18,19ははんだ層で
ある。
The drawings show one embodiment of the present invention, in which Fig. 1 is a front view of a copper tube and an aluminum tube, Fig. 2 is an enlarged longitudinal cross-sectional view of the same end, and Figs. 3 and 4 are ultrasonic waves. FIG. 5 is a vertical cross-sectional view of the soldering device, FIG. 5 is a vertical cross-sectional view of the pipe connecting device, and FIGS. 6 to 10 are vertical cross-sectional views sequentially showing the connection process. In the figure, 1 is a copper tube (first metal tube), 2 is an aluminum tube (second metal tube), 2a is an enlarged diameter section, 4 is a solder bath, 5 is an ultrasonic vibrator, 13 is a holder, 14 is a pressure jig, 15 is an ultrasonic vibrator, 1
6 and 17 are gas burners, and 18 and 19 are solder layers.

Claims (1)

【特許請求の範囲】[Claims] 1 端部の外周面にはんだを付着した第1の金属
管と端部に形成された拡径部の内周面にはんだを
付着しそのはんだ付着内周面の内径を第1の金属
管のはんだ付着外周面の外径よりも小さくした第
2の金属管とを互いに突合わせる工程と、第1及
び第2の金属管を突合わせた状態でその端部のは
んだを加熱溶融させる工程と、はんだの溶融時に
第1及び第2の金属管に超音波振動を印加しなが
ら加圧して第1の金属管の端部を第2の金属管の
拡径部の内側に挿圧嵌合させ更に第1の金属管の
先端を第2の金属管の拡径部よりも奥方まで挿圧
して該拡径部の奥方部分を拡径させる工程と、第
1及び第2の金属管の嵌合部分の下方部を加熱す
る工程とからなる金属管の接続方法。
1. A first metal tube with solder attached to the outer circumferential surface of the end, and solder attached to the inner circumferential surface of the enlarged diameter part formed at the end, and the inner diameter of the soldered inner circumferential surface of the first metal tube. a step of butting together a second metal tube whose outer diameter is smaller than the outer diameter of the outer circumferential surface to which the solder is attached; a step of heating and melting the solder at the end of the first and second metal tubes while the first and second metal tubes are butted together; When the solder is melted, pressure is applied to the first and second metal tubes while applying ultrasonic vibrations, and the end of the first metal tube is press-fitted inside the enlarged diameter portion of the second metal tube. a step of expanding the diameter of the inner part of the enlarged diameter part by inserting pressure into the tip of the first metal tube further than the enlarged diameter part of the second metal tube; and a fitting part of the first and second metal tubes. A method for connecting metal pipes, which comprises the step of heating the lower part of the pipe.
JP24267684A 1984-11-16 1984-11-16 Connecting method of metallic pipe Granted JPS61123464A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP24267684A JPS61123464A (en) 1984-11-16 1984-11-16 Connecting method of metallic pipe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP24267684A JPS61123464A (en) 1984-11-16 1984-11-16 Connecting method of metallic pipe

Publications (2)

Publication Number Publication Date
JPS61123464A JPS61123464A (en) 1986-06-11
JPH0354028B2 true JPH0354028B2 (en) 1991-08-16

Family

ID=17092577

Family Applications (1)

Application Number Title Priority Date Filing Date
JP24267684A Granted JPS61123464A (en) 1984-11-16 1984-11-16 Connecting method of metallic pipe

Country Status (1)

Country Link
JP (1) JPS61123464A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0735651Y2 (en) * 1989-07-28 1995-08-16 昭和アルミニウム株式会社 Heat exchanger
JP5395918B2 (en) * 2012-02-06 2014-01-22 株式会社スグロ鉄工 Method for producing thin-walled cylindrical metal member with bottom

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4994540A (en) * 1973-01-12 1974-09-07
JPS51108324A (en) * 1975-03-20 1976-09-25 Nisshin Steel Co Ltd Sutenresukokanno nanrosetsuhoho
JPS5530954A (en) * 1978-08-28 1980-03-05 Citizen Watch Co Ltd Hammer driver for inpact printer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4994540A (en) * 1973-01-12 1974-09-07
JPS51108324A (en) * 1975-03-20 1976-09-25 Nisshin Steel Co Ltd Sutenresukokanno nanrosetsuhoho
JPS5530954A (en) * 1978-08-28 1980-03-05 Citizen Watch Co Ltd Hammer driver for inpact printer

Also Published As

Publication number Publication date
JPS61123464A (en) 1986-06-11

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