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
Links
- 229910000679 solder Inorganic materials 0.000 claims description 65
- 229910052751 metal Inorganic materials 0.000 claims description 37
- 239000002184 metal Substances 0.000 claims description 37
- 238000000034 method Methods 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 11
- 238000002844 melting Methods 0.000 claims 1
- 230000008018 melting Effects 0.000 claims 1
- 229910052782 aluminium Inorganic materials 0.000 description 51
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 51
- 229910052802 copper Inorganic materials 0.000 description 45
- 239000010949 copper Substances 0.000 description 45
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 44
- 239000003507 refrigerant Substances 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000012530 fluid Substances 0.000 description 5
- 238000005476 soldering Methods 0.000 description 5
- 230000013011 mating Effects 0.000 description 4
- 239000000155 melt Substances 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- 238000003825 pressing Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 150000001879 copper Chemical class 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/14—Soldering, e.g. brazing, or unsoldering specially adapted for soldering seams
- B23K1/18—Soldering, 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.
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.
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
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.
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)
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.
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)
| 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)
| 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 |
-
1984
- 1984-11-16 JP JP24267684A patent/JPS61123464A/en active Granted
Patent Citations (3)
| 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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