JPS6171173A - Manufacture of aluminum heat exchanger - Google Patents
Manufacture of aluminum heat exchangerInfo
- Publication number
- JPS6171173A JPS6171173A JP59193589A JP19358984A JPS6171173A JP S6171173 A JPS6171173 A JP S6171173A JP 59193589 A JP59193589 A JP 59193589A JP 19358984 A JP19358984 A JP 19358984A JP S6171173 A JPS6171173 A JP S6171173A
- Authority
- JP
- Japan
- Prior art keywords
- tube
- brazing material
- aluminum
- fin
- brazing
- 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.)
- Pending
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
- F28F19/02—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings
- F28F19/06—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings of metal
-
- 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
- B23K1/19—Soldering, e.g. brazing, or unsoldering taking account of the properties of the materials to be soldered
-
- 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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/14—Heat exchangers
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、車両搭載用空気調和装置などに用いられるア
ルミニウム熱交換器の製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of manufacturing an aluminum heat exchanger used in a vehicle-mounted air conditioner or the like.
車重軽減による燃費性能の向上が重要な技術課題をなし
ている自動車業界においては、車載空調装置用熱交換器
に対しても軽量化対策が求められつつある。コンデンサ
ーあるいはエバポレーク−といったこの種の熱交換器の
一般的な製法としては、まずアルミニウムやアルミニウ
ム合金などの軽量金属で押出し成形された冷媒流通用の
多穴チューブを蛇行状に折り曲げて本体部分を形成させ
、相隣るチューブ間の間隙に、その表面にあらかじめろ
う付は用のろう材を被着させた、肉厚が0.16〜0.
18鰭内外のごく薄いアルミニウム合金製のコルゲート
フィンを介挿させ、治具を用いてこの組合せ構造を保持
させたうえで、全体を加熱炉内に納めてろう材の溶融温
度まで加熱することにって、ろう付けによるチューブと
フィンとの組立を完成させる方法がとられてきた。そし
て、フィンの材質としてはチューブ材料より電極電圧の
卑なアルミニウム合金を用い、腐食の起こりやすい条件
下ではフィンの方がチューブより先に腐食する、いわゆ
る犠牲腐食効果によってチューブの孔食(孔あき腐食)
を防止するように配慮されていた。In the automobile industry, where improving fuel efficiency by reducing vehicle weight is an important technical issue, measures to reduce the weight of heat exchangers for on-board air conditioners are also being sought. The general manufacturing method for this type of heat exchanger, such as a condenser or evaporator, is to first form the main body by bending a multi-hole tube for refrigerant flow extruded from lightweight metal such as aluminum or aluminum alloy into a serpentine shape. A brazing material for brazing is applied to the surface of the gap between adjacent tubes in advance, and the wall thickness is 0.16-0.
After inserting very thin aluminum alloy corrugated fins inside and outside the 18 fins and using a jig to maintain this combined structure, the entire structure was placed in a heating furnace and heated to the melting temperature of the brazing material. Therefore, the method of completing the assembly of the tube and fin by brazing has been adopted. The material for the fins is an aluminum alloy with a less noble electrode voltage than the tube material. Under conditions where corrosion is likely to occur, the fins corrode earlier than the tube, which is the so-called sacrificial corrosion effect. corrosion)
Care was taken to prevent this.
ところで、コルゲートフィンの表面にあらかじめ被着さ
れるろう材には融点降下剤としての珪素(Si)成分が
多量に配合されており、ろう付は時の高温下でこの珪素
成分がフィンの材料組織中に移行して、フィン自体の溶
融温度をも低下させてしまう現象が現われるので、ろう
付は治具による加圧力によってフィンが座屈しやすくな
り、このことがフィンの肉厚低減のための障害をなして
いた。By the way, the brazing material that is applied to the surface of the corrugated fin in advance contains a large amount of silicon (Si) component as a melting point depressant, and during brazing, this silicon component deforms the material structure of the fin at high temperatures. During brazing, the fins tend to buckle due to the pressure applied by the jig, and this becomes an obstacle to reducing the fin wall thickness. was doing.
一方、チューブの防食対策の面からみると、蛇行状に曲
げ形成されたチューブの屈曲部にはコルゲートフィンが
存在せず、そのため前述のごときフィンによる犠牲腐食
効果を期待できないので、この部分になんらかの防食手
段を講する必要があり、例えば犠牲腐食用の板材を別に
用意して取付けるとか、犠牲腐食効果のある被膜材を特
別に塗布するなどの方法が考えられたが、これらはいず
れも少なからぬコストアップを招(点で実用性に乏しか
った。On the other hand, from the perspective of corrosion prevention measures for tubes, there are no corrugated fins at the bent portions of the tubes, which are bent into a meandering shape. It was necessary to take anti-corrosion measures; for example, methods such as preparing and installing a separate plate for sacrificial corrosion, or applying a special coating material that has a sacrificial corrosion effect were considered, but each of these methods was not insignificant. This led to an increase in costs (and was therefore impractical).
別のチューブ防食対策としては、チューブ表面に亜鉛拡
散処理を施す方法も案出されているが、処理浴廃液の後
処理に支出を要する難点があった。As another anti-corrosion measure for the tube, a method has been devised in which the surface of the tube is subjected to zinc diffusion treatment, but this method has the drawback of requiring expenditure for post-treatment of the waste liquid from the treatment bath.
さらに組立用のろう材をごく薄肉のコルゲートフィンに
被着させる代りに、フィンよりはるかに肉厚の厚いチュ
ーブ側にろう材層をクラッドすることによって、前述の
ごときろう材中の珪素成分の融点降下作用に基づくフィ
ンの材質劣化問題を避ける方法も本発明者などによって
すでに試みられているが、フィンの如く単純な平坦なシ
ート材にろう材層を設けるのと異なり、押出し加工チュ
ーブの場合には、ろう材をクラッドしたシートを多穴チ
ューブ状に加工する際に、ろう材の一部がチューブの穴
の内側に移動して、チューブとフィンとのろう付は時に
前記穴の内側におけるろう材が溶融して、前記穴の通路
面積を減じるなどの不具合があった。Furthermore, instead of attaching the brazing filler metal for assembly to the extremely thin corrugated fins, by cladding the brazing filler metal layer on the side of the tube, which is much thicker than the fins, the melting point of the silicon component in the filler metal as described above The present inventor and others have already tried to avoid the problem of material deterioration of fins due to the falling effect, but unlike providing a brazing material layer on a simple flat sheet material like a fin, in the case of an extruded tube, When processing a sheet clad with brazing filler metal into a multi-hole tube shape, some of the brazing filler metal moves inside the holes of the tube, and the brazing between the tube and fins is sometimes caused by the soldering inside the holes. There were problems such as the material melting and reducing the passage area of the hole.
本発明は上記点に鑑み、フィン薄肉化および耐食性の向
上と製造コスト低減を実現できるアルミニウム熱交換器
の製造方法を提供することを目的とする。In view of the above-mentioned points, an object of the present invention is to provide a method for manufacturing an aluminum heat exchanger that can achieve thinner fins, improved corrosion resistance, and reduced manufacturing costs.
本発明は、上記の目的達成のために、押出し加工により
多数の穴を有するアルミニウム製チューブを成形し、該
チューブの表面に、マグネシウムを含有し、かつ該チュ
ーブより電極電位の卑な組成からなるアルミニウムろう
材を溶融メッキし、この熔融メッキ工程の前後のいずれ
かにおいて前記チューブを蛇行状に折り曲げ、相隣るチ
ューブ間にアルミニウム製コルゲートフィンを介挿させ
た後、真空加熱炉内にて前肥ろう材の溶融温度に加熱し
て、前記チューブと前記コルゲートフィンを前記ろう材
の溶融メッキ層を介して接合せしめるという技術的手段
を採用する。In order to achieve the above object, the present invention forms an aluminum tube having a large number of holes by extrusion processing, and the surface of the tube is made of a composition containing magnesium and having an electrode potential less noble than that of the tube. Aluminum brazing material is hot-dip plated, and either before or after the hot-dip plating process, the tube is bent into a serpentine shape, and aluminum corrugated fins are inserted between adjacent tubes. A technical means is employed in which the tube and the corrugated fin are joined through a molten plated layer of the brazing material by heating the material to the melting temperature of the brazing material.
本発明では、上記の技術的手段を有することにより次の
ごとき効果が得られる。In the present invention, the following effects can be obtained by having the above-mentioned technical means.
(イ)本発明では、−フィンよりはるかに厚肉で、丈夫
なチューブの表面に予めアルミニウムろう材を熔融メッ
キする方法を採っているので、従来方法のごとくろう材
中の成分がごく薄肉のフィン材の中に移行して、ろう付
は時の高温下で座屈現象を起こすという不具合が発生せ
ず、従ってフィンの厚さは通常の設計値の下限ぎりぎり
の値まで薄くすることができ、フィンの軽量化が達成さ
れる。(a) The present invention employs a method in which aluminum brazing material is melt-plated in advance on the surface of a tube that is much thicker and more durable than -fins, so unlike the conventional method, the components in the brazing material are Brazing does not transfer into the fin material and cause buckling under high temperatures, and therefore the fin thickness can be reduced to the lowest possible value of the normal design value. , the weight of the fin can be reduced.
(ロ)チューブ表面に予め熔融メッキされるろう材とし
て、マグネシウムを含む組成のアルミニウム合金を使用
しているから、このマグネシウムの存在によって、溶融
ろう材中に含まれる微量の酸素及び水分を除去するいわ
ゆるゲッター効果を発揮して、チューブ表面を清浄に保
つことができ、フラックス等を用いることなく良好な溶
融メッキ層が得られ、また同様のゲッター効果により真
空ろう付けをも容易にすることができる。(b) Since an aluminum alloy with a composition containing magnesium is used as the brazing material that is melt-plated on the tube surface in advance, the presence of this magnesium removes trace amounts of oxygen and moisture contained in the molten brazing material. It exhibits a so-called getter effect, allowing the tube surface to be kept clean, allowing a good hot-dip plating layer to be obtained without using flux, etc., and also making vacuum brazing easier due to the same getter effect. .
(ハ)チューブ表面に被着させるろう材のメッキ層は、
犠牲腐食機能を備えており、且つチューブ全長に亘って
施されているので、最も腐食の起こりやすい屈曲部分に
ついても、従来のような特別の後加工を施すことなく確
実に大幅な耐食性向上を図ることができる。(c) The plating layer of brazing material applied to the tube surface is
Since it has a sacrificial corrosion function and is applied over the entire length of the tube, it can reliably significantly improve corrosion resistance even in bent parts where corrosion is most likely to occur, without the need for special post-processing as in conventional methods. be able to.
つぎに、本発明によるアルミニウム熱交換器の製造方法
を図に示す実施例に基づいて説明する。Next, a method for manufacturing an aluminum heat exchanger according to the present invention will be explained based on examples shown in the drawings.
第1図は本発明の製法によって作られた車載空開機の冷
凍機用コンデンサーとして用いられる熱交換器の斜視図
であって、第2図の斜視図にみられるように、冷媒の流
れ方向に沿って内部に複数状の仕切壁1aを設けて多数
の穴1bを形成した偏平チューブ1を所定間隔を保って
蛇行状に折り曲げることによって、全体として角形パネ
ル状をなす熱交換器の主体部分が構成されており、偏平
チューブ1の平行部間には、アルミニウムまたはアルミ
ニウム合金製のごく薄肉の伝熱面積増大用コルゲートフ
ィン2が介挿され、このチューブ1とフィン2とは、チ
ューブ1の表面にあらかじめ被着させであるろう材のメ
ッキ層3の熔融時接合力によって一体的にろう付結合さ
れている。チューブ1の両開口端には、冷媒の集合分配
を行うためのアキュームレータパイプ4.5および外部
の冷媒配管と接続される接続ユニオン6.7がろう付さ
れている。FIG. 1 is a perspective view of a heat exchanger used as a condenser for a refrigerating machine of an on-vehicle air-opening machine manufactured by the manufacturing method of the present invention, and as seen in the perspective view of FIG. By bending the flat tube 1, which has a plurality of partition walls 1a along the inside and a large number of holes 1b in a serpentine shape at predetermined intervals, the main part of the heat exchanger is formed into a rectangular panel shape as a whole. A very thin corrugated fin 2 made of aluminum or aluminum alloy for increasing the heat transfer area is inserted between the parallel parts of the flat tube 1, and the tube 1 and the fin 2 are connected to the surface of the tube 1. They are integrally brazed together by the melting bonding force of the plating layer 3 of brazing material, which is previously applied to the plated layer 3. An accumulator pipe 4.5 for collecting and distributing refrigerant and a connecting union 6.7 for connection with external refrigerant pipes are brazed to both open ends of the tube 1.
次に、本発明の製法を工程順に説明する。まず、押出し
成形機にて前述した断面形状(第2図参照)を有するア
ルミニウムあるいはアルミニウム合金製の偏平チューブ
1を成形する。この偏平チューブ1は、第3図において
左方から右方に連続的に供給され、ろう材3′の溶融メ
ッキ装置A内に送入される。このメッキ装置A内は窒素
ガスを充満させることによって590〜605°Cの高
温下にあるろう材やチューブ1が酸化されるのを防止す
る。メッキ方式として本例では、噴射ノズルBから噴射
される溶融ろう3′の噴流中にチューブ1を通人させる
方法を用いており、そしてチューブ1の表面に被着され
るろう材の熔融メッキ層3は、30〜50μm程度の厚
さにするのが好ましい。Next, the manufacturing method of the present invention will be explained step by step. First, an aluminum or aluminum alloy flat tube 1 having the above-described cross-sectional shape (see FIG. 2) is molded using an extrusion molding machine. This flat tube 1 is continuously supplied from the left to the right in FIG. 3, and is fed into the hot-dip plating apparatus A for the brazing filler metal 3'. The interior of the plating apparatus A is filled with nitrogen gas to prevent the brazing material and tube 1, which are at a high temperature of 590 to 605 DEG C., from being oxidized. In this example, the plating method uses a method in which the tube 1 is passed through the jet of molten solder 3' injected from the injection nozzle B, and the molten plating layer of the brazing material applied to the surface of the tube 1 is coated on the surface of the tube 1. 3 preferably has a thickness of about 30 to 50 μm.
本例では、チューブ1の材質として、例えばA1050
のアルミニウム合金を用い、ろう材3′として、マグネ
シウム(Mg)を0.05〜3.0wt%含み、かつチ
ューブ1より電極電位の卑な組成のアルミニウム合金(
具体的にはA6−10wtoASi−1,5wt%Mg
−1,0wt%Zn)を用いている。In this example, the material of the tube 1 is A1050, for example.
An aluminum alloy containing 0.05 to 3.0 wt% of magnesium (Mg) as the brazing filler metal 3' and having a composition less noble in electrode potential than the tube 1 is used as the brazing filler metal 3'.
Specifically, A6-10wtoASi-1,5wt%Mg
-1.0wt%Zn) is used.
ろう材に含有されるMgは、溶融ろう材3′に含まれる
微量の酸素及び水分を除去する、いわゆるゲッター効果
によりチューブlの表面を清浄に保つという作用を果し
、それによってろう材3′の溶融メッキを良好に行うこ
とができる。The Mg contained in the brazing filler metal has the function of keeping the surface of the tube l clean through the so-called getter effect, which removes minute amounts of oxygen and moisture contained in the molten brazing filler metal 3'. Hot-dip plating can be performed well.
ここで、Mg含有量を0.05〜3.0wt%の範囲に
設定するのは、0.05%未満では先のゲッター効果が
不十分であり、3%を越えると、後述の真空ろう付は中
にMgが蒸発して炉壁に析出するMgの量が増大し、こ
れを定期的に除去する必要が生じ、作業上大きな負担と
なるためである。Here, the reason for setting the Mg content in the range of 0.05 to 3.0 wt% is that if it is less than 0.05%, the getter effect described above is insufficient, and if it exceeds 3%, the vacuum brazing described below This is because Mg evaporates inside the reactor, increasing the amount of Mg precipitated on the furnace wall, and it becomes necessary to periodically remove this, which becomes a heavy burden on the work.
第4図は上記のごとくしてろう材のメッキ層3を被着さ
せたチューブ1の横断面を示すものであって、溶融メ・
7キ層3で表面を覆われたチューブ1は、その後、所定
の間隔を保って蛇行状に折り曲げて熱交換器本体部分を
形成し、次にこの蛇行状チューブ1の平行部間の間隙部
にコルゲートフィン2を介挿するとともに、チューブ1
の両端部にアキュームレータパイプ4.5および接続ユ
ニオン6.7を組付け、これら部材1.2.4.5.6
.7の組付体を治具により組付けて保持する。FIG. 4 shows a cross section of the tube 1 coated with the plating layer 3 of brazing filler metal as described above.
The tube 1 whose surface is covered with the 7 layers 3 is then bent into a meandering shape at a predetermined interval to form the heat exchanger body, and then the gap between the parallel parts of the meandering tube 1 is bent. At the same time, insert the corrugated fin 2 into the tube 1.
Assemble the accumulator pipe 4.5 and the connection union 6.7 to both ends of the
.. The assembled body No. 7 is assembled and held using a jig.
しかる後、この組付体を590〜605°Cの温度に保
たれ、かつ10−5〜1O−6TOrr程度の真空雰囲
気下にある加熱炉内に約10分間送入し、熔融メッキ層
3を溶融させることによってチューブ1とフィン2とを
一体にろう付は結合でき、またアキュームレータパイプ
4.5の内外両表面にクラッドされたろう材及び接続ユ
ニオン6.7部に配置した置きろうにより、チューブ1
とアキュームレータパイプ4.5との間及びこのバイブ
4.5とユニオン6.7との間も同時に一体ろう付けで
きる。これにより、第1図に示す熱交換器全体の組付を
完成できる。上記真空ろう付げにおいても、ろう材中に
包含されるMgのゲッター効果によりフラックスなしで
良好なろう付は結合を行うことができる。Thereafter, this assembled body was sent into a heating furnace maintained at a temperature of 590 to 605°C and under a vacuum atmosphere of about 10-5 to 1O-6 TOrr for about 10 minutes to form the molten plating layer 3. By melting the tube 1 and the fins 2, the tube 1 and the fins 2 can be integrally joined by brazing.
and the accumulator pipe 4.5 and between the vibrator 4.5 and the union 6.7 can also be integrally brazed at the same time. Thereby, the entire assembly of the heat exchanger shown in FIG. 1 can be completed. Even in the vacuum brazing described above, good brazing and bonding can be achieved without flux due to the getter effect of Mg contained in the brazing material.
上記したコルゲートフィン2の材質として、本例では前
記溶融メッキ層3のろう材より更に電極電位の低いアル
ミニウム合金、具体的にはAJ−1,2wt%Mn−2
,0wt%Znのアルミニウム合金を用いている。従っ
て、本例では、チューブ1−溶融メツキ層3→コルゲー
トフィン2の順に電極電位が低くなるように、アルミニ
ウム合金の組成が選定しである。In this example, the material of the above-mentioned corrugated fin 2 is an aluminum alloy having an electrode potential lower than that of the brazing material of the hot-dip plating layer 3, specifically AJ-1, 2wt%Mn-2.
,0wt%Zn aluminum alloy is used. Therefore, in this example, the composition of the aluminum alloy is selected so that the electrode potential becomes lower in the order of tube 1 - melt plating layer 3 -> corrugated fin 2.
このようなアルミニウム合金の組成選定によって、熱交
換器の耐食性向上において次のごとき利点が生じる。す
なわち、チューブ1とコルゲートフィン2とが隣接する
部分では、ろう材熔融メッキ層3とコルゲートフィン2
の犠牲腐食効果によりチューブ1の孔食を防止すること
ができ、またコルゲートフィン2が隣接しないチューブ
屈曲部lc(第1図)に対してはろう材熔融メッキ層3
の犠牲腐食効果によりチューブ1の孔食を防止できる。By selecting the composition of the aluminum alloy as described above, the following advantages arise in improving the corrosion resistance of the heat exchanger. That is, in the portion where the tube 1 and the corrugated fin 2 are adjacent to each other, the brazing metal melt plating layer 3 and the corrugated fin 2
Pitting corrosion of the tube 1 can be prevented due to the sacrificial corrosion effect of
Pitting corrosion of the tube 1 can be prevented by the sacrificial corrosion effect.
しかも、前者のチューブ1とコルゲートフィン2とが隣
接する部分では、ろう材溶融メッキ屓3よりコルゲート
フィン2の方が電極電位が低いため、フィン2が優先的
に犠牲腐食することになる。従って、ろう材熔融メブキ
層3の損傷が生じにくく、チューブ1とフィン2のろう
付状態が長期間にわたって良好に維持される。Moreover, in the portion where the former tube 1 and the corrugated fin 2 are adjacent to each other, since the electrode potential of the corrugated fin 2 is lower than that of the brazing material hot-dip plating layer 3, the fin 2 undergoes sacrificial corrosion preferentially. Therefore, damage to the molten brazing material layer 3 is less likely to occur, and the brazed state between the tube 1 and the fins 2 is maintained satisfactorily over a long period of time.
一方、コルゲートフィン2の肉厚は、従来のフィン表面
にろう材の被着層を設ける方法によれば、ろう材中の珪
素成分に由来する前述の座屈強度低下現象のために通常
0.12m1以上に保つ必要があったが、本発明の製法
によれば、この種の座屈現象はほとんど起こり得ないの
で、より肉厚の薄いフィン2を用いても、ろう付は組立
時の590〜605°C210分間加熱といった厳しい
温度条件下に曝されるごとに耐えられる。On the other hand, according to the conventional method of providing an adhesion layer of brazing material on the surface of the fin, the wall thickness of the corrugated fin 2 is usually 0.00 mm due to the aforementioned buckling strength reduction phenomenon originating from the silicon component in the brazing material. However, according to the manufacturing method of the present invention, this kind of buckling phenomenon is almost impossible to occur, so even if thinner fins 2 are used, the brazing can be performed at 590 mm or more during assembly. Can withstand exposure to severe temperature conditions such as heating up to 605°C for 210 minutes.
そごで、フィン2の肉厚を0.16〜O,OTtmの範
囲でさまざまに変えた場合に、ろう付は時の座屈現象が
どの(らいの厚さ以下になった時、起こり始めるかを従
来の熱交換器の製法と、本発明の製法とを比較しつつテ
ストした。第1表はそのテストデータである。So, when the wall thickness of the fin 2 is varied in the range of 0.16 to O,OTm, the buckling phenomenon of brazing starts to occur when the thickness becomes below the A test was conducted comparing a conventional heat exchanger manufacturing method and the manufacturing method of the present invention.Table 1 shows the test data.
第1表 フィンのろう付は試験結果
上記第1表から明らかなように、コルゲートフィン2の
表面にあらかじめろう材層を被着させてお〈従来製法で
は、フィン肉厚が0.1211以下に下がると確実に座
屈が起こったのに対して、本発明の製法によった場合に
は、フィン肉厚が0.071以下に下がった時、始めて
座屈を生しることがわかり、本発明の製法によれば、フ
ィン2の大幅な薄肉化が可能となり、製品の軽量化に大
きく役立つことが実証された。Table 1 Test results for fin brazing As is clear from Table 1 above, a layer of brazing material is applied to the surface of the corrugated fin 2 in advance. Whereas buckling definitely occurred when the fin thickness decreased, buckling occurred for the first time when the fin wall thickness decreased to 0.071 or less when the manufacturing method of the present invention was used. According to the manufacturing method of the invention, it is possible to make the fin 2 significantly thinner, and it has been demonstrated that it is greatly useful in reducing the weight of the product.
つぎに、熱交換器の製法と製品の耐食性との関連性につ
いて、特に腐食の最も生じやすいチューブの屈曲部1c
に着目して評価テストを行った結果を第2表Δ、Bにま
とめた。Next, regarding the relationship between the heat exchanger manufacturing method and the corrosion resistance of the product, we will particularly discuss the bent portion 1c of the tube where corrosion is most likely to occur.
The results of an evaluation test focusing on the above are summarized in Table 2 Δ and B.
第2表A チューブの腐食試験結果(本発明)第2表B
チューブの腐食試験結果(従来品)上記第2表A、B
における材料組成の数字はwt%を示す。Table 2 A Tube corrosion test results (invention) Table 2 B
Tube corrosion test results (conventional product) Table 2 A and B above
The numbers for material composition in indicate wt%.
テストは3種類のチューブ材料を用い、それぞれ従来製
法と本発明製法によって熱交換器を作り、J I S
D0201に規定する腐食試験(CASS試験法)を試
みた。この表に明らかなように、従来製法によった製品
はチューブ1の材質の如何にかかわらず、テスト開始3
00時間後には、チューブ1の屈曲部1cから漏れが生
じ始めたのに対して、本発明の製法によるものは、テス
トした3種類の材質のいずれについても、700時間経
過後においても、冷媒漏れが認められず、耐食性の優秀
さを確認することができた。In the test, three types of tube materials were used, and heat exchangers were made using the conventional manufacturing method and the manufacturing method of the present invention.
A corrosion test (CASS test method) specified in D0201 was attempted. As is clear from this table, regardless of the material of tube 1, products manufactured using the conventional method were tested at 3.
After 700 hours, leakage started to occur from the bent portion 1c of the tube 1, whereas in the case of the manufacturing method of the present invention, there was no refrigerant leakage even after 700 hours with all three types of materials tested. No corrosion was observed, confirming the excellent corrosion resistance.
前記した第2表Aにおいて、本発明品A、Bでは、チュ
ーブ1−ろう材溶融メッキ層3−コルゲートフィン2の
順に電極電位が低くなるように各部材1.3.2の組成
を選定しであるが、本発明品Cではろう材溶融メッキ層
3とコルゲートフィン2の電極電位がほぼ同電位となる
ように組成を選定してあり、このような組成の組合せで
あっても本発明は同様に実施できる。In the above-mentioned Table 2 A, in the products A and B of the present invention, the compositions of each member 1.3.2 were selected such that the electrode potential becomes lower in the order of tube 1 - brazing material hot-dip plating layer 3 - corrugate fin 2. However, in the product C of the present invention, the composition is selected so that the electrode potentials of the brazing material hot-dip plating layer 3 and the corrugated fin 2 are approximately the same potential, and even with such a composition combination, the present invention can be applied. It can be implemented similarly.
上記の実施例は、自動車搭載用空g機の熱交換器に関す
るものであるが、これと同種の構造をもったさまざまな
熱交換器(例えば蒸発器等)についても本発明を同様に
通用できることはもちろんである。また、上記実施例で
は、チューブ1を蛇行状に曲げ加工する前にろう材を熔
融メッキしているが、チューブ1を蛇行状に曲げ加工し
た後に、チューブ1の表面にろう材を溶融メッキしても
よい。Although the above embodiment relates to a heat exchanger for a car-mounted air compressor, the present invention can be similarly applied to various heat exchangers (for example, evaporators, etc.) having the same type of structure. Of course. Furthermore, in the above embodiment, the brazing material is melt-plated before the tube 1 is bent into a serpentine shape, but after the tube 1 is bent into a serpentine shape, the surface of the tube 1 is melt-plated with a brazing material. It's okay.
また、上記の実施例ではろう材を溶融メッキする方法と
して、溶融ろう材3′を噴射ノズル已によりチューブ1
の表面上に噴射する方法を用いているが、噴射ノズルB
を廃止して、チューブ1を溶融ろう材3′内に直接浸漬
する等の他の方法を用いることも可能である。In addition, in the above embodiment, as a method of molten brazing filler metal plating, the molten brazing filler metal 3' is sprayed onto the tube 1 through the injection nozzle.
A method of spraying onto the surface of the spray nozzle B is used.
It is also possible to omit this and use other methods, such as directly immersing the tube 1 into the molten brazing filler metal 3'.
第1図は本発明製法によって作られた熱交換器の斜視図
、第2図はチューブの折り曲げ形状の一部断面を含む斜
視図、第3図は本発明方法の要部の工程概要図、第4図
はろうメッキ層を被着させたチューブの横断面図である
。
1・・・偏平チューブ、2・・・コルゲートフィン、3
・・・ろう材の溶融メッキ層、3′・・・熔融ろう、A
・・・ろう溶融メッキ装置、B・・・溶融ろう噴射ノズ
ル。FIG. 1 is a perspective view of a heat exchanger manufactured by the manufacturing method of the present invention, FIG. 2 is a perspective view including a partial cross section of a bent tube, and FIG. 3 is a process outline diagram of the main parts of the method of the present invention. FIG. 4 is a cross-sectional view of a tube coated with a brazing layer. 1... Flat tube, 2... Corrugated fin, 3
... Molten plating layer of brazing filler metal, 3'... Melting wax, A
... Wax fusion plating equipment, B: molten wax injection nozzle.
Claims (4)
製チューブを成形し、該チューブの表面に、マグネシウ
ムを含有し、かつ該チューブより電極電位の卑な組成か
らなるアルミニウムろう材を溶融メッキし、この溶融メ
ッキ工程の前後のいずれかにおいて前記チューブを蛇行
状に折り曲げ、相隣るチューブ間にアルミニウム製コル
ゲートフィンを介挿させた後、真空加熱ろ内にて前記ろ
う材の溶融温度に加熱して、前記チューブと前記コルゲ
ートフィンを前記ろう材の溶融メッキ層を介して接合せ
しめることを特徴とするアルミニウム熱交換器の製造方
法。(1) An aluminum tube with a large number of holes is formed by extrusion, and the surface of the tube is hot-dipped with an aluminum brazing filler metal that contains magnesium and has a composition with a lower electrode potential than the tube. Either before or after the hot-dip plating process, the tube is bent into a meandering shape, aluminum corrugated fins are inserted between adjacent tubes, and then heated to the melting temperature of the brazing material in a vacuum heating filter. . A method of manufacturing an aluminum heat exchanger, characterized in that the tube and the corrugated fin are joined via a hot-dip plating layer of the brazing material.
含有量が0.05〜3.0wt%であることを特徴とす
る特許請求の範囲第1項記載のアルミニウム熱交換器の
製造方法。(2) The method for manufacturing an aluminum heat exchanger according to claim 1, wherein the aluminum brazing material has a magnesium content of 0.05 to 3.0 wt%.
が30〜50μmであることを特徴とする特許請求の範
囲第1項または第2項記載のアルミニウム熱交換器の製
造方法。(3) The method for manufacturing an aluminum heat exchanger according to claim 1 or 2, wherein the thickness of the hot-dip plating layer of the aluminum brazing material is 30 to 50 μm.
材より更に電極電位の低い組成のアルミニウム合金から
なることを特徴とする特許請求の範囲第1項乃至第3項
のいずれかに記載のアルミニウム熱交換器の製造方法。(4) The aluminum heat exchanger according to any one of claims 1 to 3, wherein the corrugated fins are made of an aluminum alloy having a composition that has a lower electrode potential than the aluminum brazing material. Production method.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP59193589A JPS6171173A (en) | 1984-09-14 | 1984-09-14 | Manufacture of aluminum heat exchanger |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP59193589A JPS6171173A (en) | 1984-09-14 | 1984-09-14 | Manufacture of aluminum heat exchanger |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6171173A true JPS6171173A (en) | 1986-04-12 |
Family
ID=16310481
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP59193589A Pending JPS6171173A (en) | 1984-09-14 | 1984-09-14 | Manufacture of aluminum heat exchanger |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6171173A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4775004A (en) * | 1984-02-22 | 1988-10-04 | The Furukawa Electric Co., Ltd. | Copper radiator for motor cars excellent in corrosion resistance and method of manufacturing |
US4838474A (en) * | 1987-03-06 | 1989-06-13 | National Research Institute For Metals | Method of diffusion bonding of aluminum or alumina ceramics |
CN105371687B (en) * | 2015-10-27 | 2017-07-11 | 珠海格力电器股份有限公司 | Heat exchange assembly, heat exchanger and refrigerating system |
-
1984
- 1984-09-14 JP JP59193589A patent/JPS6171173A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4775004A (en) * | 1984-02-22 | 1988-10-04 | The Furukawa Electric Co., Ltd. | Copper radiator for motor cars excellent in corrosion resistance and method of manufacturing |
US4838474A (en) * | 1987-03-06 | 1989-06-13 | National Research Institute For Metals | Method of diffusion bonding of aluminum or alumina ceramics |
CN105371687B (en) * | 2015-10-27 | 2017-07-11 | 珠海格力电器股份有限公司 | Heat exchange assembly, heat exchanger and refrigerating system |
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