JP2682851B2 - Method for manufacturing brazed product having screw member - Google Patents

Description

【発明の詳細な説明】 産業上の利用分野 この発明は、例えばユニオンとかコネクタと称される
ジョイント金具等を備えたカークーラー用コンデンサや
ラジエータ等のネジ部材を有するろう付製品の製造方法
に関する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a brazed product having a screw member such as a condenser for a car cooler equipped with a joint fitting called a union or a connector and a radiator.

従来の技術 例えば熱交換器におけるジョイント金具等のネジ部材
には、熱交換媒体通路を構成するパイプ部材等が連結さ
れる。これらの連結に際して、その連結部分より熱交換
媒体が漏出しないように強固に締結することが要求され
る。従って、この種のネジ部材は強度的に優れたもので
あることが要求されることにより、強度向上元素である
MgおよびZnを含有せしめたAl合金が広く用いられてい
る。かかるネジ部材は、本体部材に対して、真空ろう付
等の炉中ろう付により接合一体化される場合がある。2. Description of the Related Art For example, a pipe member forming a heat exchange medium passage is connected to a screw member such as a joint fitting in a heat exchanger. When connecting these, it is required that the heat exchange medium is firmly fastened so that the heat exchange medium does not leak from the connecting portion. Therefore, since this type of screw member is required to have excellent strength, it is a strength improving element.
Al alloys containing Mg and Zn are widely used. The screw member may be joined and integrated with the main body member by brazing in a furnace such as vacuum brazing.

発明が解決しようとする課題 しかしながら、かかる炉中ろう付法によるときは、ろ
う付時にネジ部材中のMgおよびZnが炉中雰囲気に飛散し
てしまうためにネジ部材、特にその表面層の強度が低下
してしまい、ネジ締結時にネジ山が崩れ易くなるという
難を有するものであった。DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, when using the furnace brazing method, the strength of the screw member, especially the surface layer of the screw member, because Mg and Zn in the screw member scatter into the furnace atmosphere during brazing. However, there is a problem in that the thread is likely to collapse when the screw is fastened.

この発明は、上述の問題点に鑑みてなされたものであ
り、強度向上元素としてZnおよびMgを含むAl合金からな
るネジ部材と本体部材とを炉中ろう付により接合一体化
する製造方法でありながら、強度に優れたネジ部材を有
するろう付製品を製造する方法を提供することを目的と
するものである。The present invention has been made in view of the above-mentioned problems, and is a manufacturing method in which a screw member and a body member made of an Al alloy containing Zn and Mg as a strength improving element are integrally joined by furnace brazing. However, it is an object of the present invention to provide a method for manufacturing a brazed product having a screw member with excellent strength.

課題を解決するための手段 この発明は、端的にはネジ部材に、ZnおよびMg飛散防
止用のキャップ部材を被嵌せしめた状態で炉中ろう付す
るようにしたものである。Means for Solving the Problems The present invention is to braze in a furnace in a state where a cap member for preventing Zn and Mg scattering is fitted over a screw member.

即ち、強度向上元素としてZnおよびMgを含むAl合金か
らなるジョイント金具等のネジ部材と、本体部材とを炉
中ろう付により接合一体化するに際し、上記ネジ部材の
少なくともネジ部に、キャップ部材を着脱自在に被嵌せ
しめることにより、ろう付中にネジ部材中の前記強度向
上元素の飛散を防止することを特徴とする、ネジ部材を
有するろう付製品の製造方法を要旨とするものである。That is, when a screw member such as a joint metal fitting made of an Al alloy containing Zn and Mg as a strength improving element and a main body member are joined and integrated by brazing in a furnace, at least a screw portion of the screw member is provided with a cap member. A method for manufacturing a brazed product having a screw member is characterized by preventing the strength-enhancing element from scattering in the screw member during brazing by detachably fitting.

この発明は、強度向上元素としてMgおよびZnを含有す
るアルミニウム合金、例えばA7N01合金や、Mg:0.3〜0.8
wt％、Zn:4.0〜8.0wt％、を含有し、かつZr:0.05〜0.30
wt％、Mn:0.05〜0.30wt％、Cr:0.05〜0.30wt％、Cu:0.0
5〜0.30wt％のうち１種または２種以上を含有するアル
ミニウム基合金等からなるジョイント金具のようなネジ
部材を有するろう付製品の製造方法を対象とするもので
ある。後者の合金は、特にフッ化物系のフラックスを用
いてろう付仕様により組立てられる熱交換器におけるジ
ョイント金具として好適に用いられるものである。This invention is an aluminum alloy containing Mg and Zn as a strength improving element, for example, A7N01 alloy, Mg: 0.3 to 0.8
wt%, Zn: 4.0-8.0 wt%, and Zn: 0.05-0.30
wt%, Mn: 0.05-0.30wt%, Cr: 0.05-0.30wt%, Cu: 0.0
The present invention is directed to a method for producing a brazed product having a screw member such as a joint metal fitting made of an aluminum-based alloy containing one or more of 5 to 0.30 wt%. The latter alloy is particularly suitable for use as a joint fitting in a heat exchanger assembled by brazing specifications using a fluoride-based flux.

而して、この種のジョイント金具等のネジ部材と、熱
交換器本体等の本体部材とを組み立てた状態として炉中
に搬入し、かつ加熱することによって接合一体化せしめ
る。前記接合に際してろう材を配置する方法は常法に従
えば良く、例えば、心材の表面にろう材がクラッドされ
たいわゆるブレージングシートにより本体部材を形成す
ることでろう材を配置する方法や、ねじ部材と本体部材
の間にシート状のろう材を事前に配置するなど、任意の
方法を採り得る。なお、炉中ろう付は真空ろう付に限ら
ず、フラックスろう付等であっても良い。Then, the screw member such as the joint fitting of this type and the main body member such as the heat exchanger main body are brought into the furnace in an assembled state, and are heated to be joined and integrated. The method of arranging the brazing filler metal at the time of joining may be according to a conventional method, for example, a method of arranging the brazing filler metal by forming a main body member with a so-called brazing sheet in which the brazing filler metal is clad on the surface of the core material, or a screw member. Any method such as arranging a sheet-shaped brazing material in advance between the main body member and the main body member can be adopted. The brazing in the furnace is not limited to vacuum brazing, but may be flux brazing or the like.

かかる炉中ろう付に際し、ネジ部材の少なくともネジ
部にキャップ部材を着脱自在に被嵌せしめるものとす
る。ここに、キャップ部材とは必ずしも一端閉塞状のも
ののみならず、円筒状のようなものをも含む。また被嵌
とは必ずしもネジ部の表面に密着状態に嵌め合わせるこ
とのみを意味するものではなく、若干離間状に嵌め合わ
せる場合をも含む。上記キャップ部材は、ネジ部材を構
成するアルミニウム合金に含まれる、強度向上元素であ
るMgおよびZnが飛散してしまうのを防止するためのもの
である。従って、上記キャップ部材の具体的な形状およ
び被嵌の態様は、ろう付中におけるMgおよびZnの飛散防
止に寄与するものであれば特に限定されるものではな
い。例えば、ネジ部材がジョイント金具のようにその周
面に雄ネジ部を有するものであれば、キャップ部材とし
て上記雄ネジ部に対応する雌ネジ部を有するものとなさ
れた一端閉塞状のものを採用し、これによりネジ部全体
を実質的に炉中雰囲気から遮蔽せしめるようにしても良
いし、あるいはナット状のようなキャップ部材を採用
し、ネジ部の周側面のみを取り囲むようにしても良い。
また、上述のようにネジ部の全体を覆う態様で被嵌せし
める場合であっても、またネジ部の周側面のみを覆う態
様で被嵌せしめる場合であっても、キャップ部材をネジ
部の表面に密着させることなく、ネジ部の表面から若干
離間せしめた状態で被嵌せしめても良い。後者の場合、
ネジ部表面は炉中雰囲気から遮蔽されない状態となる
が、本発明の目的を十分に達成することができる。When brazing in the furnace, the cap member is detachably fitted to at least the screw portion of the screw member. Here, the cap member is not limited to one that is closed at one end, but also includes a cylindrical member. Further, the fitting does not necessarily mean only fitting in close contact with the surface of the screw portion, but also includes fitting in a slightly separated state. The cap member is for preventing scattering of Mg and Zn which are strength improving elements contained in the aluminum alloy forming the screw member. Therefore, the specific shape and fitting mode of the cap member are not particularly limited as long as they contribute to the prevention of the scattering of Mg and Zn during brazing. For example, if the screw member has a male screw portion on its peripheral surface like a joint fitting, a cap member having a female screw portion corresponding to the male screw portion is used. However, in this way, the entire screw portion may be substantially shielded from the atmosphere in the furnace, or a nut-like cap member may be adopted to surround only the peripheral side surface of the screw portion.
In addition, as described above, even when the screw member is fitted in such a manner as to cover the entire screw portion, or in the manner in which only the peripheral side surface of the screw portion is covered, the cap member is not covered by the surface of the screw portion. It may be fitted in a state in which it is slightly separated from the surface of the screw portion without being brought into close contact with. In the latter case,
Although the surface of the screw portion is not shielded from the atmosphere in the furnace, the object of the present invention can be sufficiently achieved.

キャップ部材の材質は特に限定されず、ステンレス、
アルミニウム合金等の金属、またはカーボン、セラミッ
クス等の非金属が好適に用いられる。なお、炉中での加
熱に耐え得るものであることが必要であることはいうま
でもない。The material of the cap member is not particularly limited, and stainless steel,
A metal such as an aluminum alloy or a nonmetal such as carbon or ceramics is preferably used. Needless to say, it must be able to withstand heating in the furnace.

而して、上記キャップ部材を被嵌せしめた状態で常法
に従って炉中ろう付を行うものとする。そして、ろう付
後に、キャップ部材を取り除けば良い。Then, brazing in the furnace is carried out according to a conventional method with the cap member fitted. Then, after brazing, the cap member may be removed.

発明の効果 この発明にかかるネジ部材を有するろう付製品の製造
方法は、強度向上元素としてZnおよびMgを含むAl合金か
らなるジョイント金具等のネジ部材と、本体部材とを炉
中ろう付により接合一体化するに際し、上記ネジ部材の
少なくともネジ部に、キャップ部材を着脱自在に被嵌せ
しめることにより、ろう付中にネジ部材中の前記強度向
上元素の飛散を防止するものであるから、所定量のMgお
よびZnを含有した強度に優れたネジ部材を有するろう付
製品を製造することができる。従って、この製造方法に
より製造されたろう付製品にあっては、そのネジ部材に
対し被連結部材をしっかりと締結固定することができ
る。EFFECTS OF THE INVENTION A method for manufacturing a brazed product having a screw member according to the present invention is a method of joining a screw member such as a joint metal fitting made of an Al alloy containing Zn and Mg as a strength improving element and a main body member by brazing in a furnace At the time of integration, at least the screw portion of the screw member is detachably fitted with a cap member to prevent scattering of the strength-enhancing element in the screw member during brazing. It is possible to manufacture a brazed product having a screw member containing Mg and Zn having excellent strength. Therefore, in the brazed product manufactured by this manufacturing method, the connected member can be firmly fastened and fixed to the screw member.

また、キャップ部材をネジ部材に着脱自在に嵌め合わ
せるものであるから、ろう付前後において容易に着脱す
ることができて作業性を良好なものとすることができ
る。Moreover, since the cap member is detachably fitted to the screw member, the cap member can be easily attached and detached before and after brazing, and the workability can be improved.

実施例 熱交換器本体（１）と、第１表に示す組成および調質
のアルミニウム合金からなるジョイント金具（２）を準
備すると共に、これに嵌め合わせるためのキャップ部材
（３）として、第１図に示すように、上記ジョイント部
材（２）の雄ねじ部（2a）に対応する雌ネジ部（3a）を
有する一端閉塞状のステンレス鋼（SUS304）製のものを
準備した。Example A heat exchanger body (1) and a joint metal fitting (2) made of an aluminum alloy having the composition and temper shown in Table 1 were prepared, and a cap member (3) for fitting to the heat exchanger main body (1) was used as a cap member (3). As shown in the figure, one end closed stainless steel (SUS304) having a female screw portion (3a) corresponding to the male screw portion (2a) of the joint member (2) was prepared.

そして、第２図に示すように、熱交換器本体（１）の
チューブ材（1a）に、上記ジョイント部材（２）を組付
けると共に、ジョイント部材（２）の雄ネジ部（2a）に
キャップ部材（３）を嵌め合わせた後、真空炉（４）中
に搬入し、圧力:10^-5〜10^-6Torrの条件下で、600℃×30
分間加熱し、その後真空炉（４）から搬出し、３週間に
亘って自然時効化させた。なお、熱交換器本体（１）と
チューブ（1a）とのろう付は、ブレージングシート製熱
交換器本体（１）のろう材を利用することにより行っ
た。 Then, as shown in FIG. 2, the joint member (2) is attached to the tube material (1a) of the heat exchanger body (1), and the male screw portion (2a) of the joint member (2) is capped. After fitting the member (3), it is loaded into the vacuum furnace (4) and pressure is 10 ^-5 to 10 ^-6 Torr, 600 ℃ × 30
It was heated for 1 minute, then taken out of the vacuum furnace (4) and naturally aged for 3 weeks. The brazing of the heat exchanger body (1) and the tube (1a) was performed by using the brazing material of the brazing sheet heat exchanger body (1).

上記ジョイント部材（２）の強度を調べるために、真
空炉（４）中で加熱する前、および自然時効化過程にお
ける複数の時点で硬度を測定し、その結果を第１図およ
び第２図に示した。In order to examine the strength of the joint member (2), the hardness was measured before heating in the vacuum furnace (4) and at a plurality of times during the natural aging process, and the results are shown in FIGS. 1 and 2. Indicated.

一方、比較のために、キャップ部材（３）を嵌め合わ
せないこと以外は上記実施例と全く同様の条件でジョイ
ント部材（２）を真空炉（４）中で加熱し、かつ自然時
効化させた。その結果を、第１図および第２図にあわせ
て示す。On the other hand, for comparison, the joint member (2) was heated in the vacuum furnace (4) and naturally aged under the same conditions as in the above-described example except that the cap member (3) was not fitted. . The results are also shown in FIGS. 1 and 2.

上記結果から明らかなように、キャップ部材（３）を
嵌め合わせたジョイント部材（２）の方が炉中ろう付に
伴う強度の低下が大巾に減少していることを確認し得
た。As is clear from the above results, it could be confirmed that the joint member (2) fitted with the cap member (3) greatly reduced the decrease in strength due to brazing in the furnace.

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

図面は、この発明の実施例を示すもので、第１図はジョ
イント部材とキャップ部材とを分離して示した一部切欠
き側面図、第２図はジョイント部材のネジ部にキャップ
部材を嵌め合わせた状態で真空炉中にて加熱している状
態を示す説明図、第３図および第４図はジョイント部材
の硬度変化を示すグラフである。 （１）……本体部材（熱交換器本体）、（２）……ネジ
部材（ジョイント部材）、（2a）……ネジ部、（３）…
…キャップ部材、（４）……真空炉。The drawings show an embodiment of the present invention. FIG. 1 is a partially cutaway side view showing a joint member and a cap member separated from each other, and FIG. 2 is a view showing a screw member of the joint member fitted with a cap member. An explanatory view showing a state of heating in a vacuum furnace in a combined state, FIG. 3 and FIG. 4 are graphs showing changes in hardness of the joint member. (1) …… Main body member (heat exchanger main body), (2) …… Screw member (joint member), (2a) …… Screw part, (3)…
… Cap member, (4) …… Vacuum furnace.

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】強度向上元素としてZnおよびMgを含むAl合
金からなるジョイント金具等のネジ部材と、本体部材と
を炉中ろう付により接合一体化するに際し、上記ネジ部
材の少なくともネジ部に、キャップ部材を着脱自在に被
嵌せしめることにより、ろう付中にネジ部材中の前記強
度向上元素の飛散を防止することを特徴とする、ネジ部
材を有するろう付製品の製造方法。1. When joining a screw member such as a joint fitting made of an Al alloy containing Zn and Mg as a strength improving element and a main body member by brazing in a furnace, at least a screw portion of the screw member, A method for manufacturing a brazed product having a screw member, characterized in that the cap member is detachably fitted to prevent scattering of the strength improving element in the screw member during brazing.