JPH05192765A - Aluminum brazing method and furnace therefor - Google Patents
Aluminum brazing method and furnace thereforInfo
- Publication number
- JPH05192765A JPH05192765A JP4235724A JP23572492A JPH05192765A JP H05192765 A JPH05192765 A JP H05192765A JP 4235724 A JP4235724 A JP 4235724A JP 23572492 A JP23572492 A JP 23572492A JP H05192765 A JPH05192765 A JP H05192765A
- Authority
- JP
- Japan
- Prior art keywords
- brazing
- chamber
- work
- protective atmosphere
- preheating
- 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.)
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、アルミニウムろう付け
方法及びアルミニウムろう付け炉に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aluminum brazing method and an aluminum brazing furnace.
【０００２】[0002]
【従来の技術】従来、保護雰囲気中で強制対流及び輻射
によりアルミニウム部材のろう付け処理を行う方法が知
られている。このろう付け方法では、例えばマッフル炉
中で輻射のみによりろう付けを行う場合に比して強制対
流加熱を利用できるので、加熱効率が良く生産性が高
い。ただこの方法では、被ろう付け部材（以下、ワ−ク
という）に吸着されている有害ガス成分（例えば、酸素
ガスや水蒸気）や保護雰囲気ガス中の残存有害ガス成分
がろう付けに悪影響を与えるという問題があった。2. Description of the Related Art Conventionally, there is known a method of brazing an aluminum member by forced convection and radiation in a protective atmosphere. In this brazing method, for example, forced convection heating can be used as compared with the case where brazing is performed only by radiation in a muffle furnace, so that the heating efficiency is high and the productivity is high. However, in this method, harmful gas components (for example, oxygen gas and water vapor) adsorbed on the brazed member (hereinafter referred to as work) and residual harmful gas components in the protective atmosphere gas adversely affect brazing. There was a problem.
【０００３】この問題を解決すべく特公昭５７−４２４
２０号公報は、保護雰囲気中で強制対流及び輻射により
アルミニウム部材を効率良く予熱しておき、その後、主
として輻射加熱によりろう付け処理を行うことを開示し
ている。このようにすれば、ろう付け時におけるろう付
け部位近傍の保護雰囲気ガスの流動が減り、その結果、
ろう付け部位への有害ガス成分の接触が低減される。To solve this problem, Japanese Patent Publication No. 57-424
Japanese Unexamined Patent Publication No. 20 discloses that an aluminum member is efficiently preheated by forced convection and radiation in a protective atmosphere, and then a brazing process is mainly performed by radiant heating. This reduces the flow of the protective atmosphere gas near the brazing site during brazing, and as a result,
The contact of harmful gas components with the brazing site is reduced.
【０００４】また従来、保護雰囲気中でフラックスを被
着したワ−クを主として輻射加熱を用い、従として対流
加熱を用いてろう付け処理することが提案されている。Further, it has been proposed in the past to braze a work coated with a flux in a protective atmosphere by mainly using radiant heating and secondary convection heating.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、上記し
た公報のろう付け方法、及び、フラックス被着済みワ−
クを保護雰囲気中で主に輻射加熱を用いてろう付け処理
する上記従来方法では、主として輻射によりワ−ク加熱
を行うので、ワ−クの形状や配置状態によってはワ−ク
間及びワ−ク各部の温度ばらつきが大きくなり、その結
果、昇温しにくいワ−ク部位ではろう材が充分に流れ
ず、ろう付け品質が低下する不具合が生じた。特に、こ
の温度ばらつき問題はワ−ク形状が非常に複雑であった
り、又は、生産性向上のためワ−クを高密度配置して一
括ろう付けする場合に深刻となる。However, the brazing method of the above-mentioned publication and the flux-deposited wire are disclosed.
In the above-mentioned conventional method in which the work is brazed mainly in the protective atmosphere by using radiant heating, the work is heated mainly by radiant heat. As a result, there is a problem that the brazing material does not flow sufficiently at the work part where the temperature rise is difficult to occur and the brazing quality deteriorates. In particular, this temperature variation problem becomes serious when the work shape is very complicated, or when the work is densely arranged and collectively brazed in order to improve productivity.
【０００６】もちろん、必要なろう付け処理温度で長時
間、ワ−クを加熱すれば上記温度ばらつきを減らせる
が、このような加熱時間の延長はろう材によるアルミニ
ウム部材すなわちワ−クの浸食といった新たな不具合を
生じる可能性が考えられ、生産性も悪化してしまう。更
に上記したフラックス被着のワ−クを長時間加熱する場
合には、フラックスの蒸発により、ろう付け不良が生じ
る不具合があった。Of course, if the work is heated for a long time at the required brazing temperature, the above temperature variation can be reduced. However, such extension of the heating time leads to corrosion of the aluminum member, that is, the work by the brazing material. It is possible that new defects will occur and productivity will deteriorate. Further, when the above flux-coated work is heated for a long time, there is a problem that brazing failure occurs due to evaporation of the flux.
【０００７】また、ワ−クを低密度配置して輻射による
温度ばらつきを低減することも可能であるが、この場合
にも配置密度減少率に比例して生産性が低下してしまう
という問題が生じてしまう。本発明は上記問題点に鑑み
なされたものであり、ワ−クのろう付け温度ばらつきの
低減、生産性の向上及び有害ガス成分の影響低減を全て
実現し得るアルミニウムろう付け方法及びアルミニウム
ろう付け炉を提供することを、その目的としている。Although it is possible to reduce the temperature variation due to radiation by arranging the work at a low density, in this case as well, there is a problem that the productivity decreases in proportion to the reduction rate of the arrangement density. Will occur. The present invention has been made in view of the above problems, and an aluminum brazing method and an aluminum brazing furnace capable of realizing a reduction in variation in the brazing temperature of a work, an improvement in productivity, and a reduction in the influence of harmful gas components. Its purpose is to provide.
【０００８】[0008]
【課題を解決するための手段】本発明のアルミニウムろ
う付け方法は、少なくともろう付け部位にフラックス及
びろう材が被着されたワ−クとしてのアルミニウム部材
を保護雰囲気中で予熱する予熱工程と、予熱済みワ−ク
を前記保護雰囲気中で主として強制対流により加熱しフ
ラックス活性化及びろう材溶解を順次行うろう付け工程
と、ろう付け済みワ−クを前記保護雰囲気中で徐冷する
徐冷工程とを備えることを特徴としている。The aluminum brazing method of the present invention comprises a preheating step of preheating an aluminum member as a work having a flux and a brazing material adhered at least at a brazing site in a protective atmosphere. A brazing step in which the preheated work is heated in the protective atmosphere mainly by forced convection to sequentially perform flux activation and brazing material melting, and a slow cooling step in which the brazed work is gradually cooled in the protective atmosphere. It is characterized by having and.
【０００９】本発明のアルミニウムろう付け炉は、フラ
ックス及びろう材が被着されたワ−クとしてのアルミニ
ウム部材を予熱するための予熱室、予熱済みワ−クを加
熱しフラックス活性化及びろう材溶解を順次行うための
ろう付け室、及び、ろう付け済みワ−クを徐冷するため
の徐冷室を備える気密可能な炉体と、前記各室に保護雰
囲気ガスを充填する保護雰囲気ガス充填手段と、ワ−ク
を前記予熱室から前記ろう付け室を経由して前記徐冷室
へ搬送する搬送手段と、前記予熱室へのワ−ク搬入を行
うワ−ク搬入手段と、前記徐冷室からのワ−ク搬出を行
うワ−ク搬出手段と、前記予熱室及びろう付け室内に配
設され前記保護雰囲気ガスを加熱するヒ−タと、前記ろ
う付け室内に前記保護雰囲気ガスの強制対流を生起させ
る循環ファンとを備えるアルミニウムろう付け炉におい
て、前記ろう付け室内に配設され、ワ−クへの輻射熱量
を低減して前記ワ−クの加熱を主として前記強制対流に
より実施させる輻射遮断部材を備えることを特徴ととし
ている。The aluminum brazing furnace of the present invention comprises a preheating chamber for preheating an aluminum member as a work to which flux and brazing material are applied, a preheated work for heating flux and activating the brazing material. An airtight furnace body having a brazing chamber for sequentially melting and a slow cooling chamber for gradually cooling the brazed work, and a protective atmosphere gas filling for filling each chamber with a protective atmosphere gas Means, conveying means for conveying the work from the preheating chamber to the slow cooling chamber via the brazing chamber, work feeding means for carrying the work into the preheating chamber, and Work carrying-out means for carrying out the work from the cold room, a heater arranged in the preheating chamber and the brazing chamber to heat the protective atmosphere gas, and a protective atmosphere gas in the brazing chamber. With a circulation fan that causes forced convection In the aluminum brazing furnace, a radiation blocking member is provided in the brazing chamber, which reduces the amount of radiant heat to the work and mainly heats the work by the forced convection. I am trying.
【００１０】アルミニウム部材の前記ろう付け部位には
まずろう材層が被着され、その上にフラックス層が被着
される。ろう材層は通常、アルミニウム部材厚さの５〜
１０％の厚さに被着され、フラックス層は通常、水へフ
ラックスを３〜１０％（Ｗｔ％）濃度のフラックス液を
塗布し被着されるかまたはアルミニウム部材表面へフラ
クッス粉末をエアスプレー等により被着される。A brazing material layer is first applied to the brazing portion of the aluminum member, and then a flux layer is applied thereto. The brazing material layer is usually 5 to 5 times the aluminum member thickness.
The flux layer is applied to a thickness of 10%, and the flux layer is usually applied by applying a flux solution having a concentration of 3 to 10% (Wt%) to water, or is applied to the surface of an aluminum member by air spraying flux powder. Be applied by.
【００１１】ここで、上記アルミニウム部材としては、
純アルミニウムの他、アルミニウムを主要成分とするア
ルミニウム合金を含む。フラックスとしては、弗化アル
ミニウム酸カリウム（ＫＡｌＦ4 ・Ｋ3 ＡｌＦ 6 とＫ2
ＡｌＦ5 ・Ｈ2 Ｏの一種または二種以上の混合物）を採
用することができる。Here, as the aluminum member,
In addition to pure aluminum,
Includes aluminum alloy. As the flux, Al fluoride
Potassium minate (KAlFFour・ K3AlF 6And K2
AlFFive・ H2O or a mixture of two or more)
Can be used.
【００１２】ろう材としては、ＪＩＳＢＡ４３４３、Ｊ
ＩＳＢＡ４０４５、ＪＩＳＢＡ４０４７等を採用するこ
とができる。本発明のろう付け方法の好適な態様におい
て、ワ−クの温度は、フラックス活性化温度（例えば摂
氏５５０度）からろう付け処理温度（例えば摂氏６００
度）まで毎分摂氏５度以上２５度以下、好ましくは毎分
摂氏１０度以上２０度以下の昇温速度で上昇させられ
る。昇温速度を上記範囲に維持すれば、通常のフラック
ス液濃度（大体３から１０％）を変更することなく、こ
の昇温時間中においてフラックスが蒸発して不足すると
いう事態は生じない。逆に昇温速度がこの範囲以下とな
ると、上記昇温時間中のフラックスの蒸発量が増大して
しまい、ろう材厚さが薄い場合にはろう付け品質が低下
する可能性が生じ、ろう材厚さを厚くする場合にはろう
材の流れにより融点が下がりワーク部材の浸食が発生す
る。As the brazing material, JIS BA4343, J
ISBA4045, JISBA4047, etc. can be adopted. In a preferred embodiment of the brazing method of the present invention, the temperature of the work is from a flux activation temperature (eg 550 degrees Celsius) to a brazing process temperature (eg 600 degrees Celsius).
Up to 5 degrees Celsius per minute and 25 degrees Celsius or less per minute, preferably 10 degrees Celsius or more and 20 degrees Celsius or less per minute. If the heating rate is maintained within the above range, the flux will not evaporate and become insufficient during this heating time without changing the normal flux liquid concentration (approximately 3 to 10%). On the other hand, if the heating rate falls below this range, the amount of flux evaporated during the heating time will increase, and if the brazing material is thin, the brazing quality may deteriorate. When the thickness is increased, the melting point is lowered due to the flow of the brazing material, and the work member is eroded.
【００１３】ろう付け工程における昇温速度は、風速、
強制対流ガス温度、ワ−ク状態の３条件によりほぼ決定
される。風速は０．３から１．５ｍ／ｓ、好ましくは
０．６から１ｍ／ｓ（ワーク中央の位置で測定）、強制
対流ガス温度は（ワ−ク流入前において）摂氏５５０か
ら６００度程度とすることが好適である。本発明のろう
付け方法の好適な態様において、ろう付け工程は、酸素
濃度１００ＰＰＭ以下、好ましくは５０ＰＰＭ以下とさ
れ、かつ、露点は摂氏−３５度以下好ましくは摂氏−４
０度以下とされる。酸素濃度及び露点がこれ以下であれ
ば、上記通常のフラックス被着量において、ろう付け不
良は生じない。The temperature rising rate in the brazing process is the wind speed,
It is almost determined by three conditions: forced convection gas temperature and work state. The wind speed is 0.3 to 1.5 m / s, preferably 0.6 to 1 m / s (measured at the center of the work), and the forced convection gas temperature is about 550 to 600 degrees Celsius (before the inflow of the work). Is preferred. In a preferred embodiment of the brazing method of the present invention, the brazing step has an oxygen concentration of 100 PPM or less, preferably 50 PPM or less, and a dew point of -35 degrees Celsius or less, preferably -4 degrees Celsius.
It is set to 0 degrees or less. If the oxygen concentration and the dew point are lower than this, no brazing failure will occur in the above-mentioned usual flux deposition amount.
【００１４】本発明のろう付け炉の好適な態様におい
て、ろう付け室へ保護雰囲気ガスを注入する保護雰囲気
ガス注入手段と、徐冷室及び予熱室入口部から保護雰囲
気ガスを排出する保護雰囲気ガス排出手段とが配設され
る。この場合、予熱室をワ−ク搬送可能に搬送方向へ気
通自在に複数の小室に分割し、更に下流側の小室から上
流側に隣接の小室へ保護雰囲気ガスを分流する分流ファ
ンを配設すると更に好適である。In a preferred embodiment of the brazing furnace of the present invention, a protective atmosphere gas injection means for injecting a protective atmosphere gas into the brazing chamber, and a protective atmosphere gas for discharging the protective atmosphere gas from the inlet of the slow cooling chamber and the preheating chamber Ejecting means are provided. In this case, the preheating chamber is divided into a plurality of small chambers so that the preheat chamber can be conveyed in the conveying direction so that the preheating chamber can be freely communicated in the conveying direction. Then, it is more preferable.
【００１５】本発明のろう付け炉の好適な態様におい
て、フラックスとして弗化アルミニウム酸カリウムを採
用する場合、ワ−クは摂氏５５０度（フラックス活性化
温度）まで予熱室で予熱することが好ましい。予熱温度
がこれより高い場合には予熱室でのフラックスの蒸発が
問題となり、予熱温度がこれより低い場合にはろう付け
室での対流だけによる昇温に時間がかかるのでこの場合
にも、ろう付け室でのフラックスの蒸発量の増大が無視
できない。In the preferred embodiment of the brazing furnace of the present invention, when potassium fluoroaluminate is used as the flux, the work is preferably preheated to 550 degrees Celsius (flux activation temperature) in the preheating chamber. If the preheating temperature is higher than this, the evaporation of the flux in the preheating chamber becomes a problem, and if the preheating temperature is lower than this, it takes time to raise the temperature only by convection in the brazing chamber. The increase in the amount of flux evaporated in the attachment room cannot be ignored.
【００１６】本発明のろう付け炉の好適な態様におい
て、ろう付け炉内のワ−ク搬送領域を搬送可能に囲むバ
ッフルが強制対流路形成のために、金属缶体により形成
され、更に、このバッフルの内面又は外面に断熱材を素
材とするパネル状の輻射遮断部材が取り付けられる。In a preferred embodiment of the brazing furnace of the present invention, a baffle that circumscribes the work transfer region in the brazing furnace is formed by a metal can body for forming a forced convection path. A panel-shaped radiation blocking member made of a heat insulating material is attached to the inner or outer surface of the baffle.
【００１７】[0017]
【作用】本発明のろう付け炉では、フラックス及びろう
材が被着されたワ−クとしてのアルミニウム部材は、搬
送手段により搬送されて予熱室で予熱され、ろう付け室
でろう付けされ、徐冷室で徐冷される。保護雰囲気充填
手段は各室に保護雰囲気ガスを充填し、ワ−ク搬入手段
はワ−クを予熱室へ搬入し、ワ−ク搬出手段はワ−クを
徐冷室から搬出する。ヒ−タは予熱室及びろう付け室内
の保護雰囲気ガスを加熱し、循環ファンはろう付け室内
に保護雰囲気ガスの強制対流を生起させて予熱済みのワ
−クを加熱してフラックスを溶融、活性化し、次いでろ
う材を溶融しろう付け処理が成される。この活性化され
たフラックスは有害ガス成分からワ−クのろう付け面を
保護する。ろう付け室内に設けられた輻射遮断部材はワ
−クへの熱輻射を遮断し、輻射のばらつきによる各ワ−
ク間及びワ−ク各部間の温度ばらつきを防止する。In the brazing furnace of the present invention, the aluminum member as a work on which the flux and the brazing material are adhered is conveyed by the conveying means, preheated in the preheating chamber, brazed in the brazing chamber, and gradually heated. It is gradually cooled in the cold room. The protective atmosphere filling means fills each chamber with the protective atmosphere gas, the work carry-in means carries the work into the preheating chamber, and the work carry-out means carries out the work from the slow cooling chamber. The heater heats the protective atmosphere gas in the preheating chamber and the brazing chamber, and the circulation fan causes forced convection of the protective atmosphere gas in the brazing chamber to heat the preheated work to melt and activate the flux. Then, the brazing material is melted and a brazing process is performed. This activated flux protects the brazing surface of the work from harmful gas constituents. The radiation blocking member installed in the brazing chamber blocks the heat radiation to the work and each work due to variations in radiation.
Prevents temperature variations between the work and each part of the work.
【００１８】[0018]
【発明の効果】以上説明したように本発明のアルミニウ
ムろう付け方法では、保護雰囲気ガス中でフラックス及
びろう材被着済みのアルミニウム部材を、主に強制対流
によって加熱することを特徴としている。このようにす
れば、強制対流によってワ−クを均一加熱し、かつ、こ
の強制対流により生じるろう付け面への有害ガス成分の
接触をフラックスにより防止するので、ワ−クのろう付
け温度のばらつきによるろう付け不良の低減と、ろう付
け時のワ−クの高密度配置による生産性の向上と、ろう
付け部位への有害ガス成分の接触によるろう付け不良の
低減とを全て実現することができ、その結果として、従
来方法に比べて格段に高い生産性及び歩留りを有するア
ルミニウムろう付け方法を提供することができる。As described above, the aluminum brazing method of the present invention is characterized in that the aluminum member on which the flux and the brazing material have been adhered is heated in the protective atmosphere gas mainly by forced convection. By doing so, the work is uniformly heated by the forced convection, and the contact of harmful gas components to the brazing surface caused by the forced convection is prevented by the flux. Therefore, the variation in the brazing temperature of the work is prevented. It is possible to realize all of the reduction of brazing defects due to the above, the improvement of productivity by the high density arrangement of the work during brazing, and the reduction of brazing defects due to the contact of harmful gas components to the brazing site. As a result, it is possible to provide an aluminum brazing method having significantly higher productivity and yield than the conventional method.
【００１９】本発明のアルミニウムろう付け炉では、保
護雰囲気ガスの強制対流が生起されるろう付け室内に、
ヒータからワ−クへの輻射を遮断する輻射遮断部材を配
設しているので、簡単な構成によりヒ−タからワ−クへ
の直接輻射を遮断でき、ワ−クが受熱する輻射熱量の削
減により上記アルミニウムろう付け方法を実施すること
ができる。In the aluminum brazing furnace of the present invention, in the brazing chamber where the forced convection of the protective atmosphere gas occurs,
Since a radiation blocking member that blocks radiation from the heater to the work is provided, direct radiation from the heater to the work can be blocked with a simple structure, and the amount of radiant heat received by the work can be reduced. The reduction allows the aluminum brazing method described above to be implemented.
【００２０】[0020]
【実施例】以下、本発明のアルミニウムろう付け炉の一
実施例として車両用熱交換器のろう付け供される炉を図
面を参照して説明する。まずこの炉の基本構成を説明す
れば、厚さ約３０ｃｍの断熱気密壁１０で囲まれて入口
１１及び出口１２に連通する細長の内部空間Ｓを有する
炉体１が設けられ、炉体１の入口側には入口側ベスチブ
ル２が隣接配置され、炉体１の出口側には出口側ベスチ
ブル３が隣接配置され、出口側ベスチブル３の出口に隣
接して冷却室４が配設されている。断熱気密壁１０は、
セラミックス材を用いた断熱壁とこの断熱壁を覆う金属
板壁とからなる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A furnace for brazing a vehicle heat exchanger will be described below as an embodiment of the aluminum brazing furnace of the present invention with reference to the drawings. First, the basic structure of the furnace will be described. A furnace body 1 having an elongated internal space S surrounded by a heat insulating airtight wall 10 having a thickness of about 30 cm and communicating with an inlet 11 and an outlet 12 is provided. An inlet side vestibule 2 is disposed adjacent to the inlet side, an outlet side vestibule 3 is disposed adjacent to the outlet side of the furnace body 1, and a cooling chamber 4 is disposed adjacent to an outlet of the outlet side vestibule 3. The heat insulating airtight wall 10 is
It comprises a heat insulating wall made of a ceramic material and a metal plate wall covering the heat insulating wall.
【００２１】これら各部１から４内へのワ−クの搬入、
搬送、搬出を行うためにコンベヤ（搬送手段、ワ−ク搬
入手段、ワ−ク搬出手段）５１から５８が一列に配設さ
れ、これら各部１から３内へ窒素ガス（雰囲気ガス）を
充填するために充填配管系（保護雰囲気ガス充填手段）
６１から６３が配設され、これら各部１から３内のガス
を排出するため排出配管系（保護雰囲気ガス排出手段）
７１から７３が配設されている。Carrying the work into each of these sections 1 to 4,
In order to carry and carry out, conveyors (carrying means, work carrying-in means, work carrying-out means) 51 to 58 are arranged in a line, and nitrogen gas (atmosphere gas) is filled into each of these parts 1 to 3. For filling piping system (protective atmosphere gas filling means)
61 to 63 are provided, and an exhaust piping system (protective atmosphere gas exhausting means) for exhausting the gas in these parts 1 to 3
71 to 73 are provided.
【００２２】炉体１内にはヒ−タ７、循環ファン８が配
設され、一方、炉体１外には分流ファン９１が配設され
ている。更にこの炉の主要な特徴をなすものとして、炉
体１内の搬送方向下流部には、輻射遮断用の輻射遮断部
材９（図３参照）が配設されている。以下、各部の詳細
について説明する。A heater 7 and a circulation fan 8 are arranged inside the furnace body 1, while a diversion fan 91 is arranged outside the furnace body 1. Further, as a main feature of this furnace, a radiation blocking member 9 (see FIG. 3) for blocking radiation is disposed in the furnace body 1 at a downstream portion in the transport direction. The details of each unit will be described below.
【００２３】炉体１の大きさは大体、幅２．４ｍ、高さ
２．６ｍ、長さ１５ｍで、炉体１の内部空間は入口１１
から出口１２へ順番に、搬入室１２、予熱室１３、ろう
付け室１４、搬出室を兼ねる徐冷室１５に分割される。
予熱室１３は搬送方向に沿って４個の小室Ｒに分割さ
れ、ろう付け室１４も搬送方向に沿って２個の小室Ｒに
分割されている。The size of the furnace body 1 is roughly 2.4 m in width, 2.6 m in height, and 15 m in length, and the inner space of the furnace body 1 has an inlet 11
From the outlet to the outlet 12, it is divided into a carry-in chamber 12, a preheating chamber 13, a brazing chamber 14, and a slow cooling chamber 15 which also serves as a carry-out chamber.
The preheating chamber 13 is divided into four small chambers R along the carrying direction, and the brazing chamber 14 is also divided into two small chambers R along the carrying direction.
【００２４】これら各小室Ｒはワ−ク搬送が可能な最小
開口（高さ９０ｃｍ×横１００ｃｍ）を有する隔壁によ
り互いに仕切られ、同様に搬入室１２と予熱室１３との
間、ろう付け室１４と徐冷室１５との間にも同構造の隔
壁が配設されて無駄なガス流を抑止している。入口側ベ
スチブル２はガス交換用の気密可能な準備室であって、
入口には扉２１が昇降可能に配設されたドアフ−ド２２
が配設され、出口には扉２３が昇降可能に配設されたド
アフ−ド２４が配設され、これら扉２１、２３の遮蔽に
より内部のベスチブル室が気密化される。Each of these small chambers R is partitioned from each other by a partition having a minimum opening (90 cm in height × 100 cm in width) capable of carrying a work, and similarly, between the carry-in chamber 12 and the preheating chamber 13 and the brazing chamber 14 A partition having the same structure is also provided between the cooling chamber 15 and the slow cooling chamber 15 to prevent a wasteful gas flow. The inlet side vestibule 2 is an airtight preparation room for gas exchange,
A door hood 22 in which a door 21 is vertically movable at the entrance
And a door hood 24 in which a door 23 is arranged so as to be able to move up and down is provided at the outlet, and the vestibular chamber inside is made airtight by the shielding of the doors 21 and 23.
【００２５】出口側ベスチブル３も気密可能な準備室で
あって、入口には扉３１が昇降可能に配設されたドアフ
−ド３２が配設され、出口には扉３３が昇降可能に配設
されたドアフ−ド３４が配設され、これら扉３１、３３
の遮蔽により内部のベスチブル室が気密化される。ドア
フ−ド２４は入口側ベスチブル２と炉体１の入口１１と
の間に介設されており、ドアフ−ド２４には炉体１の入
口１１を開閉する扉２８が昇降可能に配設されている。
ドアフ−ド３２は出口側ベスチブル３と炉体１の出口１
２との間に介設されており、ドアフ−ド３２には炉体１
の出口１２を開閉する扉２９が昇降可能に配設されてい
る。扉２８、２９の閉鎖により炉体１の内部空間は気密
化される。上記した各ドアフ−ド、２４、３２、は扉及
び扉昇降装置を内蔵するは金属密閉角箱である。The outlet side vestibule 3 is also a hermetically sealed preparation chamber, in which a door hood 32 in which a door 31 is vertically movable is arranged at the inlet, and a door 33 is vertically movable in the outlet. A door hood 34 is provided and these doors 31, 33 are
The vestibule chamber inside is made airtight by the shielding of. The door hood 24 is interposed between the inlet side vestibule 2 and the inlet 11 of the furnace body 1, and the door hood 24 is provided with a door 28 for opening and closing the inlet 11 of the furnace body 1 so as to be vertically movable. ing.
The door hood 32 is the exit side vestibule 3 and the exit 1 of the furnace body 1.
2 and the furnace body 1 is installed in the door hood 32.
A door 29 that opens and closes the outlet 12 is provided so as to be able to move up and down. By closing the doors 28 and 29, the inner space of the furnace body 1 is made airtight. Each of the door hoods, 24 and 32 described above is a metal closed rectangular box that houses a door and a door lifting device.
【００２６】冷却室４は出口側ベスチブル３に接して設
けられており、冷却室４の天井部には強力なワ−ク冷却
用排気ファン４１が配設されている。コンベヤ５１は入
口側ベスチブル２内へワ−クを装入するための装入コン
ベヤであり、入口側ベスチブル２内に配設されたコンベ
ヤ５２はベスチブル内搬送コンベヤである。搬入室１２
内に配設されたコンベヤ５３はベスチブル搬出コンベヤ
であり、予熱室１３及びろう付け室１４内に配設された
コンベヤ５４は搬送コンベヤである。徐冷室１５に配設
されたコンベヤ５５はベスチブル搬入コンベヤであり、
出口側ベスチブル３内に配設されたコンベヤ５６はベス
チブル内搬送コンベヤであり、コンベヤ５８は出口側ベ
スチブル３内からワ−クを搬出するための搬出コンベヤ
である。The cooling chamber 4 is provided in contact with the outlet side vestibule 3, and a powerful work cooling exhaust fan 41 is disposed on the ceiling of the cooling chamber 4. The conveyor 51 is a loading conveyor for loading the work into the vestibule 2 on the inlet side, and the conveyor 52 disposed in the vestibule 2 on the inlet side is an intra-vestibel transport conveyor. Carry-in room 12
The conveyor 53 disposed inside is a vesible carry-out conveyor, and the conveyor 54 disposed inside the preheating chamber 13 and the brazing chamber 14 is a transfer conveyor. The conveyor 55 provided in the slow cooling chamber 15 is a vessible carry-in conveyor,
The conveyor 56 arranged in the outlet side vestibule 3 is an inside vestibule conveyer conveyor, and the conveyor 58 is a carry-out conveyor for carrying out the work from the outlet side vestibule 3.
【００２７】充填配管系６１は入口側ベスチブル２内に
窒素ガスを充填する配管であり、充填配管系６２はろう
付け室１４の二小室Ｒに窒素ガスを充填する配管であ
り、充填配管系６３は出口側ベスチブル３内に窒素ガス
を充填する配管である。排出配管系７１は入口側ベスチ
ブル２内のガスを排出する配管であり、排出配管系７２
は搬入室１２からガスを排出する配管であり、排出配管
系７３は徐冷室１５からガスを排出する配管であり、排
出配管系７４は出口側ベスチブル３内からガスを排出す
る配管である。The filling piping system 61 is a piping for filling the inlet side vestibile 2 with nitrogen gas, and the filling piping system 62 is a piping for filling the two small chambers R of the brazing chamber 14 with nitrogen gas, and the filling piping system 63. Is a pipe for filling the outlet side vestibule 3 with nitrogen gas. The exhaust pipe system 71 is a pipe for exhausting the gas in the inlet side vestibule 2, and the exhaust pipe system 72
Is a pipe for discharging gas from the carry-in chamber 12, a discharge pipe system 73 is a pipe for discharging gas from the slow cooling chamber 15, and a discharge pipe system 74 is a pipe for discharging gas from the inside of the outlet side vestibule 3.
【００２８】予熱室１３及びろう付け室１４についてに
ついて以下に説明する。図２に予熱室１３の搬送方向と
直交する断面を示し、図３にろう付け室１４の搬送方向
と直交する断面を示す。ヒ−タ７は、発熱電力６ＫＷの
抵抗線を内蔵したパイプヒータであって、予熱室１３の
各小室Ｒにそれぞれ６個配設されており、天井から両側
壁内面に近接しつつ垂下している。The preheating chamber 13 and the brazing chamber 14 will be described below. FIG. 2 shows a cross section orthogonal to the carrying direction of the preheating chamber 13, and FIG. 3 shows a cross section perpendicular to the carrying direction of the brazing chamber 14. The heaters 7 are pipe heaters each having a built-in resistance wire with a heating power of 6 kW, and six heaters are provided in each small chamber R of the preheating chamber 13. The heaters 7 hang down from the ceiling while being close to the inner surfaces of both side walls. There is.
【００２９】炉体１の天井部外面には減速モ−タ８１が
設置され、減速モ−タ８１の駆動軸に連結される回転軸
が天井を回転自在に貫通して垂下され、回転軸先端には
循環ファン８が天井部近傍に取り付けられている。循環
ファン８の回転数は９００ｒｐｍで、直径は約８０ｃ
ｍ、８枚羽根形式である。循環ファン８は予熱室１３及
びろう付け室１４の各小室Ｒに各１個の割りで配設され
ている。A deceleration motor 81 is installed on the outer surface of the ceiling of the furnace body 1, and a rotary shaft connected to the drive shaft of the deceleration motor 81 rotatably penetrates through the ceiling and hangs down. A circulation fan 8 is mounted in the vicinity of the ceiling. The rotation speed of the circulation fan 8 is 900 rpm, and the diameter is about 80c.
m, 8 blade type. One circulation fan 8 is provided in each of the small chambers R of the preheating chamber 13 and the brazing chamber 14.
【００３０】循環ファン８の直下すなわち予熱室１３及
びろう付け室１４の中央部はワ−ク搬送領域となってい
て、このワ−ク搬送領域を囲んで下端だけが開口したバ
ッフル１６が取り付けられている。バッフル１６は両側
のヒ−タ７から水平方向に約２０ｃｍ、炉体１の底面か
ら垂直方向に約４０ｃｍ離れている。金属缶体であるバ
ッフル１６は強制対流路を小室Ｒ内に区画形成するとと
もに、ヒ−タ７から受熱して高温となってワ−クを輻射
加熱する役割を有している。バッフル１６の上端には、
循環ファン８を囲むシュラウド８２が配設され、これに
より、循環ファン８が生起した強制対流が図２及び図３
内に矢印のように循環する。Directly below the circulation fan 8, that is, in the center of the preheating chamber 13 and the brazing chamber 14, is a work transfer area. A baffle 16 is attached to surround the work transfer area and only the lower end is opened. ing. The baffle 16 is separated from the heaters 7 on both sides in the horizontal direction by about 20 cm and from the bottom surface of the furnace body 1 in the vertical direction by about 40 cm. The baffle 16 which is a metal can body has a role of partitioning and forming a forced convection flow path in the small chamber R, and also having a role of receiving heat from the heater 7 to reach a high temperature and radiatively heating the work. At the top of the baffle 16,
A shroud 82 surrounding the circulation fan 8 is provided, so that the forced convection generated by the circulation fan 8 is generated as shown in FIGS.
It circulates like an arrow inside.
【００３１】更に、炉体１に隣接して炉体１の片側方に
分流ファン９１がそれぞれ配設されている（図１では、
片側の分流ファン９１のみを示す。）。各分流ファン９
１は、ガス配管１７によりそれぞれ、搬送方向下流側の
小室Ｒから上流側に隣接する小室Ｒへ保護雰囲気ガスを
送気する。ガス配管１７は図２及び図３に示すように、
炉体１の側壁下部を貫通して配設されている。Further, a shunt fan 91 is arranged adjacent to the furnace body 1 on one side of the furnace body 1 (in FIG. 1, in FIG. 1).
Only the shunt fan 91 on one side is shown. ). Each shunt fan 9
1 supplies the protective atmosphere gas from the small chamber R on the downstream side in the transport direction to the small chamber R adjacent on the upstream side by the gas pipes 17, respectively. The gas pipe 17 is, as shown in FIGS. 2 and 3,
It is arranged so as to penetrate the lower part of the side wall of the furnace body 1.
【００３２】ここで、炉体１内のガス流を考えると、ろ
う付け室１４の二小室Ｒに窒素ガスが供給され、搬入室
１２及び徐冷室１５から排出されるので、ろう付け室１
４から予熱室１３を通じて搬入室１２へ流れる気流と、
ろう付け室１４から徐冷室１５へ流れる気流が生じる。
ろう付け室１４には主に吸着などによりワ−クに随伴し
て有害ガス成分（酸素ガス、水蒸気、オイルミスト）が
侵入するが、侵入した有害ガス成分は、上記した気流に
乗って排出される。Considering the gas flow in the furnace body 1, nitrogen gas is supplied to the two small chambers R of the brazing chamber 14 and is discharged from the carry-in chamber 12 and the slow cooling chamber 15. Therefore, the brazing chamber 1
The airflow flowing from 4 to the carry-in chamber 12 through the preheating chamber 13,
An airflow is generated from the brazing chamber 14 to the slow cooling chamber 15.
The harmful gas components (oxygen gas, water vapor, oil mist) enter the brazing chamber 14 along with the work mainly by adsorption, and the invading harmful gas components are discharged by riding on the above-mentioned air flow. It
【００３３】ただ、ろう付け室１４から徐冷室１５まで
の経路より、ろう付け室１４から搬入室１２までの経路
が長く、その流体抵抗が大きいので、各分流ファン９１
によりろう付け室１４から搬入室１２への気流を促進し
ている。すなわち、これら分流ファン９１によりワ−ク
に随伴する有害ガス成分は、ろう付け室１４に達する前
に予熱室１３で少しづつ還流され、その結果としてろう
付け室１４に達する有害ガス成分を低減することができ
る。However, since the path from the brazing chamber 14 to the carry-in chamber 12 is longer than the path from the brazing chamber 14 to the slow cooling chamber 15 and its fluid resistance is large, each shunt fan 91 is
This promotes the air flow from the brazing chamber 14 to the carry-in chamber 12. That is, the harmful gas components that accompany the work are circulated little by little in the preheating chamber 13 before reaching the brazing chamber 14 by the shunt fan 91, and as a result, the harmful gas components reaching the brazing chamber 14 are reduced. be able to.
【００３４】ろう付け室１４の各小室Ｒは図２及び図３
の比較から明らかなように、予熱室１３の各小室Ｒと同
じ構成であり、ただ、バッフル１６の両外側面に断熱材
を素材とするパネル状の輻射遮断部材９が張設されてい
る点が異なっている。この輻射遮断部材９は、具体的に
はセラミック材を素材としており、厚さ１０ｃｍで搬送
方向にはろう付け室１４一杯に配設されている。輻射遮
断部材９の外面とヒ−タ７との間の間隔は１０ｃｍに設
計されている。The small chambers R of the brazing chamber 14 are shown in FIGS.
As is clear from the comparison, the configuration is the same as each of the small chambers R of the preheating chamber 13, except that panel-shaped radiation blocking members 9 made of a heat insulating material are stretched on both outer surfaces of the baffle 16. Are different. Specifically, the radiation blocking member 9 is made of a ceramic material, has a thickness of 10 cm, and is arranged in the brazing chamber 14 in the transport direction. The distance between the outer surface of the radiation blocking member 9 and the heater 7 is designed to be 10 cm.
【００３５】以下、この実施例の炉の基本作動及びこの
実施例のろう付け方法の特徴をなす作用を以下に説明す
る。まず、ワ−クは、ろう材層が被着され、その上にフ
ラックス層が被着されたアルミニウム管を素材とする熱
交換器であって、ろう材層の厚さはアルミニウム部材厚
さの５〜１０％厚さ、フラックス層の厚さはフラックス
液３〜１０％濃度を塗布されている。フラックスとして
は弗化アルミニウム酸カリウムが採用され、ろう材とし
てはＡｌ−Ｓｉ系が採用される。The basic operation of the furnace of this embodiment and the operation characterizing the brazing method of this embodiment will be described below. First, the work is a heat exchanger made of an aluminum tube having a brazing material layer deposited thereon and a flux layer deposited thereon, and the brazing material layer has a thickness equal to that of the aluminum member. The thickness of the flux layer is 5 to 10%, and the concentration of the flux liquid is 3 to 10%. Potassium fluoroaluminate is used as the flux, and Al-Si system is used as the brazing material.
【００３６】ワ−クは、幅約２０ｃｍ、長さ約３０ｃ
ｍ、高さ約５ｃｍであって、このワ−クを積み重ねるこ
となく、互いに約８ｃｍの間隔を開けて、搬送用の金網
バスケット１００中に配置し、この金網バスケット１０
０をコンベヤ５１上に載置する。次に、入口側ベスチブ
ル２の扉２１を開き、コンベヤ５１、５２を同期運転し
てワ−クを入口側ベスチブル２内へ搬入した後、扉２１
を閉じる。The work has a width of about 20 cm and a length of about 30 c.
m, the height is about 5 cm, and the work is placed in a wire netting basket 100 for transport without stacking the works, and the wires are placed at a distance of about 8 cm from each other.
0 is placed on the conveyor 51. Next, the door 21 of the entrance-side vestibule 2 is opened, the conveyors 51 and 52 are operated synchronously, and the work is carried into the entrance-side vestibule 2.
Close.
【００３７】次に、図示しない真空ポンプにより入口側
ベスチブル２を０．１Ｔｏｒｒまで排気した後、不活性
ガスである窒素ガスを大気圧まで充填する。次に、扉２
３、２８を開き、コンベヤ５２、５３を高速同期運転し
て入口側ベスチブル２から炉体１内の搬入室１２へワ−
クを搬入する。搬入室１２に搬入されたワ−クは、コン
ベヤ５３、５４の低速同期運転により搬入室１２から予
熱室１３、ろう付け室１４、最後に徐冷室１５へ連続搬
送される。この間、強制対流及び主としてバッフル１６
からの輻射により予熱室１３内で摂氏約５５０度まで予
熱される。なお、バッフル１６はヒ−タ７からの輻射に
より摂氏約４００〜５６０度に加熱されている。Next, the inlet-side vestibule 2 is evacuated to 0.1 Torr by a vacuum pump (not shown), and then an inert gas, nitrogen gas, is filled up to the atmospheric pressure. Next, the door 2
3, 28 are opened, and the conveyors 52, 53 are synchronously operated at high speed to work the inlet side vestibule 2 to the carry-in chamber 12 in the furnace body 1.
Bring in the ku. The work carried into the carry-in chamber 12 is continuously carried from the carry-in chamber 12 to the preheating chamber 13, the brazing chamber 14, and finally to the slow cooling chamber 15 by the low speed synchronous operation of the conveyors 53 and 54. During this time, forced convection and mainly baffles 16
Is preheated in the preheating chamber 13 to about 550 degrees Celsius. The baffle 16 is heated to about 400 to 560 degrees Celsius by the radiation from the heater 7.
【００３８】ろう付け室１４では、バッフル１６への輻
射遮断部材９の装着により、ヒ−タ７からバッフル１６
への輻射が抑圧され、それによりバッフル１６の温度が
低温（ほぼガス温度）となっているので、バッフル１６
からワ−クへの輻射熱量は大幅に削減されている。その
結果、ワ−クはほぼ強制対流により加熱されるので、ワ
−クの各ろう付け部位間及び各ワ−ク間の温度ばらつき
が低減され、この温度ばらつきによるろう付け不良が低
減される。ろう付け室１４に入ったワ−クは、主に強制
対流だけで加熱され、それによりフラックスがまず溶
融、活性化し、次に、ろう材が溶融してろう付けが実行
される。In the brazing chamber 14, the radiation blocking member 9 is attached to the baffle 16 so that the baffle 16 can be removed from the heater 7.
Since the radiation to the baffle 16 is suppressed and the temperature of the baffle 16 is low (almost gas temperature),
The amount of radiant heat from the work to the work has been greatly reduced. As a result, since the work is heated by almost forced convection, temperature variations between the brazing parts of the work and between the works are reduced, and brazing defects due to this temperature variation are reduced. The work entering the brazing chamber 14 is heated mainly by forced convection, whereby the flux is first melted and activated, and then the brazing material is melted to perform brazing.
【００３９】図４に炉体１内におけるワ−ク温度と時間
との関係を示す。ろう付け室１４で、ワ−クはフラック
ス活性化温度（例えば摂氏５５０度）からろう付け処理
温度（例えば摂氏６００度）まで毎分摂氏５度の昇温速
度で上昇させられる。このようにすると、フラックス蒸
発量を許容範囲内に維持できるので、ろう付け不良を発
生させることが無い。昇温速度は、風速、強制対流ガス
温度、ワ−ク状態の３条件によりほぼ決定される。強制
対流ガス温度を極端に高くすることはワークの温度ばら
つきが大きくなり、ここではワ−クに流入する窒素ガス
温度を摂氏約６００度、風速を０．３ｍ／ｓ（ワーク中
央の位置で測定）以上としている。これにより、ワ−ク
のフラックス活性化温度からろう付け処理温度まで平均
して毎分摂氏５度の昇温することができる。なお、ろう
付け室１４における酸素濃度は５０ＰＰＭ以下とし、か
つ、露点は摂氏−４０度以下とした。FIG. 4 shows the relationship between the work temperature in the furnace body 1 and time. In the brazing chamber 14, the work is ramped from a flux activation temperature (eg 550 degrees Celsius) to a brazing temperature (eg 600 degrees Celsius) at a rate of 5 degrees Celsius per minute. In this way, the flux evaporation amount can be maintained within the allowable range, so that no brazing failure will occur. The rate of temperature rise is almost determined by three conditions: wind velocity, forced convection gas temperature, and work state. If the forced convection gas temperature is made extremely high, the temperature variation of the work becomes large. Here, the temperature of the nitrogen gas flowing into the work is about 600 degrees Celsius and the wind speed is 0.3 m / s (measured at the center of the work. ) And above. As a result, it is possible to raise the temperature from the flux activation temperature of the work to the brazing temperature by 5 degrees Celsius per minute on average. The oxygen concentration in the brazing chamber 14 was 50 PPM or less, and the dew point was -40 degrees Celsius or less.
【００４０】次に、ろう付けされたワ−クは、コンベヤ
５４、５５の同期低速運転により徐冷室１５に送られて
摂氏約５４０度以下まで徐冷された後、扉２９、３１を
開けて、コンベヤ５５、５６を高速同期運転することに
より、ワ−クを出口側ベスチブル３に送る。次に、扉２
９、３１を閉め、扉３３を開けて、コンベヤ５６、５７
を同期運転することにより、ワ−クを冷却室４に送り、
ここでハンドリング容易な温度まで急速冷却した後、コ
ンベヤ５７、５８を同期運転することにより搬出する。Next, the brazed work is sent to the slow cooling chamber 15 by the synchronous low speed operation of the conveyors 54 and 55, and is gradually cooled to about 540 degrees Celsius or less, and then the doors 29 and 31 are opened. Then, the conveyors 55 and 56 are operated at high speed synchronously to send the work to the outlet side vestibule 3. Next, the door 2
Close 9, 31, open the door 33, conveyer 56, 57
, The work is sent to the cooling chamber 4,
Here, after being rapidly cooled to a temperature that is easy to handle, the conveyors 57 and 58 are carried out by synchronously operating.
【００４１】図５に、フラックス活性化温度（例えば摂
氏５５０度）からろう付け処理温度（例えば摂氏６００
度）までの昇温速度と、ろう付け良品率との関係を示
す。ただし、昇温速度以外の条件はこの実施例に等し
い。ろう付け良品率はワークのろう付け部のもれ検査に
より行った。なお、上記昇温速度は強制対流加熱を主と
する場合において、毎分摂氏２６度以上とするのは種々
の点で困難であり、ろう付け室１４における上記昇温速
度は結局、毎分摂氏５度から２５度とするのが好まし
い。In FIG. 5, the flux activation temperature (for example, 550 degrees Celsius) to the brazing temperature (for example, 600 degrees Celsius).
Shows the relationship between the rate of temperature rise up to the degree) and the rate of non-defective brazing. However, the conditions other than the temperature rising rate are the same as in this embodiment. The rate of non-defective brazing was determined by a leak inspection of the brazing part of the work. In the case where forced convection heating is mainly used, it is difficult to set the heating rate to 26 degrees Celsius or more in various points. It is preferable that the angle is 5 to 25 degrees.
【００４２】上記実施例で説明した炉は、同一構造でた
だろう付けにおいて強制対流及び輻射の両方で加熱する
従来の炉に比べて、ろう付け品質を低下することなく金
網バスケット１００中に３倍の密度でワ−クを収容で
き、大幅な生産性向上が可能となった。更に、上記実施
例では連続ろう付け炉について説明したが、本発明のろ
う付け方法は、他の形式のろう付け炉に適用できること
は当然である。例えば、小規模のろう付け炉として、予
熱室とろう付け室とが共通となっていて、入口側ベスチ
ブルと出口側ベスチブルとが共通となっていて、バッチ
運転されるろう付け炉に適用することができる。この場
合、予熱時に輻射及び強制対流でワ−クを急速加熱し、
フラックス活性化温度からろう付け処理温度まで主とし
て強制対流で加熱するために、バッフルとヒ−タとの
間、又は、バッフルとワ−クとの間に可動の輻射遮断部
材を設け、予熱時には、輻射遮断部材を上記位置から離
脱させておき、予熱終了後、輻射遮断部材を上記位置に
復帰させればよい。その他、ワ−クの両側にそれぞれ断
熱パネルを挟んで輻射専用ヒ−タバッフル側に、強制対
流専用ヒ−タを炉体側壁側に配設してもよい。そして、
予熱時には両ヒ−タで輻射及び強制対流で急速加熱し、
ろう付け時には強制対流のみで温度ばらつきを抑止しつ
つ加熱を行えばよい。The furnace described in the above embodiment has three times as much metal wire basket 100 without degrading the brazing quality as compared with the conventional furnace which has the same structure and is heated by both forced convection and radiation in brazing. The work can be accommodated at the density of, and the productivity can be greatly improved. Further, although the continuous brazing furnace is described in the above embodiment, it is obvious that the brazing method of the present invention can be applied to other types of brazing furnaces. For example, as a small-scale brazing furnace, the preheating chamber and the brazing chamber are common, and the inlet side vestibule and the outlet side vestibule are common, and it is applicable to a brazing furnace operated in batch. You can In this case, during preheating, the work is rapidly heated by radiation and forced convection,
In order to heat mainly from the flux activation temperature to the brazing temperature by forced convection, a movable radiation blocking member is provided between the baffle and the heater or between the baffle and the work, and at the time of preheating, The radiation blocking member may be separated from the above position, and after the preheating, the radiation blocking member may be returned to the above position. Alternatively, a heat-dedicated heater baffle side and a forced convection-dedicated heater may be disposed on the side wall of the furnace body with heat insulating panels sandwiched on both sides of the work. And
During preheating, both heaters heat rapidly by radiation and forced convection,
When brazing, heating may be performed while suppressing temperature variations only by forced convection.
【００４３】なお、図３において、輻射遮断部材９は、
バッフル１６に接する必要はなく、ヒ−タ７から直接あ
るいはバッフル１６を介してのワ−クへの輻射を低減で
きる配置であればよい。In FIG. 3, the radiation blocking member 9 is
The baffle 16 does not have to be in contact with the baffle 16 and may be arranged so as to reduce radiation from the heater 7 directly or through the baffle 16 to the work.
【図１】本発明のアルミニウムろう付け炉の一実施例を
表す模式断面図、FIG. 1 is a schematic sectional view showing an embodiment of an aluminum brazing furnace of the present invention,
【図２】上記実施例における予熱室の模式断面図、FIG. 2 is a schematic cross-sectional view of the preheating chamber in the above embodiment,
【図３】上記実施例におけるろう付け室の模式断面図、FIG. 3 is a schematic sectional view of a brazing chamber in the above embodiment,
【図４】上記実施例におけるワ−クの温度変化を示すグ
ラフ、FIG. 4 is a graph showing the temperature change of the work in the above embodiment,
【図５】上記実施例における昇温速度とろう付け良品率
との関係を示すグラフ、FIG. 5 is a graph showing the relationship between the rate of temperature rise and the non-defective brazing rate in the above example,
１３は予熱室、１４はろう付け室、１５は徐冷室、６２
は保護雰囲気充填手段、５４はコンベヤ（搬送手段）、
５２、５３はコンベヤ（ワ−ク搬入手段）、５５、５６
はコンベヤ（ワ−ク搬出手段）、７はヒ−タ、８は循環
ファン、９は輻射遮断部材13 is a preheating chamber, 14 is a brazing chamber, 15 is a slow cooling chamber, 62
Is a protective atmosphere filling means, 54 is a conveyor (conveying means),
52 and 53 are conveyors (work-in means), 55 and 56
Is a conveyor (work-out means), 7 is a heater, 8 is a circulation fan, and 9 is a radiation blocking member.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 平子 匠 愛知県刈谷市昭和町１丁目１番地 日本電 装株式会社内 (72)発明者 井口 健 愛知県刈谷市昭和町１丁目１番地 日本電 装株式会社内 (72)発明者 外山 猛敏 愛知県刈谷市昭和町１丁目１番地 日本電 装株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hirako Takumi, 1-1, Showa-cho, Kariya city, Aichi Prefecture Nihon Denso Co., Ltd. (72) Inventor, Ken Iguchi, 1-1, Showa-cho, Kariya city, Aichi prefecture Nidec Incorporated (72) Inventor Taketoshi Toyama 1-1 1-1 Showa-cho, Kariya city, Aichi Prefecture
Claims (3)
ろう材が被着されたワ−クとしてのアルミニウム部材を
保護雰囲気中で予熱する予熱工程と、 予熱済みワ−クを前記保護雰囲気中で主として強制対流
により加熱しフラックス活性化及びろう材溶融を順次行
うろう付け工程と、 ろう付け済みワ−クを前記保護雰囲気中で徐冷する徐冷
工程とを備えることを特徴とするアルミニウムろう付け
方法。1. A preheating step of preheating an aluminum member as a work, to which flux and a brazing material are applied at least at a brazing site, in a protective atmosphere, and a preheated work is mainly forced in the protective atmosphere. An aluminum brazing method comprising: a brazing step of heating by convection to sequentially perform flux activation and melting of a brazing material; and a slow cooling step of gradually cooling a brazed work in the protective atmosphere.
前記フラックスとして弗化アルミニウム酸カリウムＫＡ
ｌＦ4 ，Ｋ3 ＡｌＦ6 とＫ2 ＡｌＦ5 ・Ｈ2 Ｏの一種ま
たは二種以上の混合物を採用し、前記ろう付け工程にお
いて摂氏５５０度から摂氏６００度までのワ−クの昇温
を毎分摂氏５度以上の昇温速度で実行する請求項１記載
のアルミニウムろう付け方法。2. An Al—Si system is adopted as the brazing material,
As the flux, potassium fluoroaluminate KA
lF 4, K 3 adopts AlF 6 and K 2 AlF 5 · H 2 O type or a mixture of two or more of the sum from 550 degrees Celsius to 600 degrees Celsius in the brazing process - every Atsushi Nobori of click The aluminum brazing method according to claim 1, wherein the aluminum brazing method is performed at a heating rate of 5 degrees Celsius or more.
としてのアルミニウム部材を予熱するための予熱室、予
熱済みワ−クを加熱しフラックス活性化及びろう材溶融
を順次行うためのろう付け室、及び、ろう付け済みワ−
クを徐冷するための徐冷室を備える気密可能な炉体と、
前記各室に保護雰囲気ガスを充填する保護雰囲気ガス充
填手段と、ワ−クを前記予熱室から前記ろう付け室を経
由して前記徐冷室へ搬送する搬送手段と、前記予熱室へ
のワ−ク搬入を行うワ−ク搬入手段と、前記徐冷室から
のワ−ク搬出を行うワ−ク搬出手段と、前記予熱室及び
ろう付け室内に配設され前記保護雰囲気ガスを加熱する
ヒ−タと、前記ろう付け室内に前記保護雰囲気ガスの強
制対流を生起させる循環ファンとを備えるアルミニウム
ろう付け炉において、 前記ろう付け室内に配設され、ワ−クへの輻射熱量を低
減して前記ワ−クの加熱を主として前記強制対流により
実施させる輻射遮断部材を備えることを特徴とするアル
ミニウムろう付け炉。3. A preheating chamber for preheating an aluminum member as a work to which flux and a brazing material are applied, a preheating chamber is heated to perform flux activation and a brazing filler metal in sequence. Brazing room and brazed wire
An airtight furnace body provided with a slow cooling chamber for slow cooling
Protective atmosphere gas filling means for filling each chamber with a protective atmosphere gas, conveying means for conveying a work from the preheating chamber to the slow cooling chamber via the brazing chamber, and a work to the preheating chamber. A work carry-in means for carrying in work, a work carry-out means for carrying out work from the slow cooling chamber, and a heater for heating the protective atmosphere gas provided in the preheating chamber and the brazing chamber. -In an aluminum brazing furnace provided with a cooling fan and a circulation fan that causes forced convection of the protective atmosphere gas in the brazing chamber, the aluminum brazing furnace is disposed in the brazing chamber to reduce the amount of radiant heat to the work. An aluminum brazing furnace characterized by comprising a radiation blocking member for heating the work mainly by the forced convection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4235724A JP2768163B2 (en) | 1991-10-18 | 1992-09-03 | Aluminum brazing method using non-corrosive flux and aluminum brazing furnace using non-corrosive flux |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27087591 | 1991-10-18 | ||
| JP3-270875 | 1991-10-18 | ||
| JP4235724A JP2768163B2 (en) | 1991-10-18 | 1992-09-03 | Aluminum brazing method using non-corrosive flux and aluminum brazing furnace using non-corrosive flux |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05192765A true JPH05192765A (en) | 1993-08-03 |
| JP2768163B2 JP2768163B2 (en) | 1998-06-25 |
Family
ID=26532291
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4235724A Expired - Lifetime JP2768163B2 (en) | 1991-10-18 | 1992-09-03 | Aluminum brazing method using non-corrosive flux and aluminum brazing furnace using non-corrosive flux |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2768163B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100424097B1 (en) * | 2001-06-19 | 2004-03-26 | 대한열기 주식회사 | Preheating system of brazing object for batch-type brazing furnace system |
| JP2007319924A (en) * | 2006-06-05 | 2007-12-13 | Kanto Yakin Kogyo Co Ltd | Continuous furnace for brazing aluminum product and method therefor |
| JP2009285719A (en) * | 2008-05-30 | 2009-12-10 | Nippon Dennetsu Co Ltd | Flux applicator |
| CN114029575A (en) * | 2021-11-16 | 2022-02-11 | 深圳市飞荣达科技股份有限公司 | Segmented brazing method and segmented brazing device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6163363U (en) * | 1984-07-03 | 1986-04-30 | ||
| JPS62176672A (en) * | 1986-01-28 | 1987-08-03 | Showa Alum Corp | Brazing method for aluminum made heat exchanger having excellent corrosion resistance |
| JPH01186270A (en) * | 1988-01-19 | 1989-07-25 | Kenji Kondo | Reflow soldering device |
| JPH01293993A (en) * | 1988-05-20 | 1989-11-27 | Kanto Yakin Kogyo Kk | Brazing method for aluminum |
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1992
- 1992-09-03 JP JP4235724A patent/JP2768163B2/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6163363U (en) * | 1984-07-03 | 1986-04-30 | ||
| JPS62176672A (en) * | 1986-01-28 | 1987-08-03 | Showa Alum Corp | Brazing method for aluminum made heat exchanger having excellent corrosion resistance |
| JPH01186270A (en) * | 1988-01-19 | 1989-07-25 | Kenji Kondo | Reflow soldering device |
| JPH01293993A (en) * | 1988-05-20 | 1989-11-27 | Kanto Yakin Kogyo Kk | Brazing method for aluminum |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100424097B1 (en) * | 2001-06-19 | 2004-03-26 | 대한열기 주식회사 | Preheating system of brazing object for batch-type brazing furnace system |
| JP2007319924A (en) * | 2006-06-05 | 2007-12-13 | Kanto Yakin Kogyo Co Ltd | Continuous furnace for brazing aluminum product and method therefor |
| JP4592645B2 (en) * | 2006-06-05 | 2010-12-01 | 関東冶金工業株式会社 | Continuous furnace for brazing aluminum products and brazing method |
| JP2009285719A (en) * | 2008-05-30 | 2009-12-10 | Nippon Dennetsu Co Ltd | Flux applicator |
| CN114029575A (en) * | 2021-11-16 | 2022-02-11 | 深圳市飞荣达科技股份有限公司 | Segmented brazing method and segmented brazing device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2768163B2 (en) | 1998-06-25 |
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