JP3905522B2 - Brazing structure and brazing method for EGR cooler - Google Patents

Brazing structure and brazing method for EGR cooler Download PDF

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JP3905522B2
JP3905522B2 JP2004041544A JP2004041544A JP3905522B2 JP 3905522 B2 JP3905522 B2 JP 3905522B2 JP 2004041544 A JP2004041544 A JP 2004041544A JP 2004041544 A JP2004041544 A JP 2004041544A JP 3905522 B2 JP3905522 B2 JP 3905522B2
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brazing
brazing material
end plate
egr cooler
groove
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JP2005230844A (en
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睦男 四方田
忠男 鈴木
彰 石井
利和 児玉
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Tokyo Radiator Mfg Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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Description

本発明は、ろう付け時のろう材の流れ性を改良したＥＧＲクーラーのろう付け構造及びろう付け方法に関する。   The present invention relates to a brazing structure and a brazing method for an EGR cooler with improved flowability of a brazing material during brazing.

従来、多管式の熱交換器を形成するＥＧＲクーラーは、特許文献１の従来技術に記載の熱交換器、あるいは特許文献２に記載の熱交換器がある。
そして、多管式熱交換器の形成には、シェルの中に配設するチューブをエンドプレートで所定の配置にて固定するため、エンドプレートに各チューブの端部をろう付けしていた（特許文献１、段落番号0005）。 Conventionally, an EGR cooler that forms a multi-tube heat exchanger includes a heat exchanger described in the prior art of Patent Document 1 or a heat exchanger described in Patent Document 2.
And in the formation of the multi-tube heat exchanger, the end of each tube is brazed to the end plate in order to fix the tube disposed in the shell in a predetermined arrangement with the end plate (patent) Reference 1, paragraph number 0005).

この多管式熱交換器を形成したＥＧＲクーラーにおけるろう付け構造では、図３に示すように、シェル１の端部に取り付けられるエンドプレート２に配置される各チューブ３の端部３ａを、エンドプレート２の外面よりも若干外方に突き出るように組み付けて配置するとともに、エンドプレート２から立ち上がる各チューブ３の端部３ａにより形成される角部（根付け部）４に接しない位置であってできるだけ近接した角部外周側の位置をろう材設置箇所５として、ＥＧＲクーラー接合用ろう材を塗布或は盛る。
ＥＧＲクーラー接合用ろう材としては、例えば、粉末にしたニッケルろうに金属粉末を添加して合成樹脂バインダーと混練したＥＧＲクーラ接合用ニッケルろう材を用いる（特許文献３）。
このろう付け構造に対するろう付け方法は、ろう材供給装置によりＥＧＲクーラ接合用ろう材を塗布或は盛付け、ろう材を乾燥した後、真空炉にて加熱してろう材を溶融すると、熔融したろう材が角部４に流れてフィレットを形成し、エンドプレート２と各チューブ３との接合箇所である根付け部（角部４）を接合するとともに間隙を密封する。 In the brazing structure in the EGR cooler in which this multi-tube heat exchanger is formed, as shown in FIG. 3, the end portions 3a of the tubes 3 arranged on the end plate 2 attached to the end portion of the shell 1 are connected to the end. Assembling and arranging so as to protrude slightly outward from the outer surface of the plate 2, and a position that does not contact the corner portion (root portion) 4 formed by the end portion 3 a of each tube 3 rising from the end plate 2 as much as possible EGR cooler joining brazing material is applied or piled up with the position on the outer peripheral side of the adjacent corner as the brazing material installation location 5.
As the brazing material for EGR cooler joining, for example, a nickel brazing material for joining EGR cooler in which a metal powder is added to a nickel brazing powder and kneaded with a synthetic resin binder is used (Patent Document 3).
The brazing method for this brazing structure is such that the brazing material for EGR cooler joining is applied or placed by a brazing material supply device, the brazing material is dried and then heated in a vacuum furnace to melt the brazing material. The brazing material flows into the corner 4 to form a fillet, and joins the root portion (corner 4), which is the joint between the end plate 2 and each tube 3, and seals the gap.

特開平10- 89880号公報JP-A-10-89880 特開2003-184659号公報Japanese Patent Laid-Open No. 2003-184659 特開2000-107883号公報JP 2000-107883 A

〔従来技術の問題点〕
このような従来のろう付け構造及びろう付け方法では、角部４に、熔融したろう材が自然に流れていって密着することを期待しても、以下の問題点により根付け不足が発生して、良好な接合性が得られなかった。
(1) 塗布或は盛付け後に乾燥したろう材が一部脱落する（一部未接着箇所発生）。
(2) 接合ろう材量の過剰或は過小が発生する（ろう材のダレ、ろう食われ等の発生）。
(3) ろう材量のバラツキが大きい。
(4) ろう材の塗布或は盛付け箇所が多い（個々のチューブ近辺に全点塗布）。 [Problems of the prior art]
In such a conventional brazing structure and brazing method, even if it is expected that the molten brazing material naturally flows and adheres to the corner 4, insufficient rooting occurs due to the following problems. Good bondability could not be obtained.
(1) A part of the brazing material that has been dried after application or deposition will fall off (partially unbonded areas).
(2) Excessive or too small amount of brazing filler metal (sag of brazing material, occurrence of brazing).
(3) There is large variation in the amount of brazing material.
(4) There are many places where brazing material is applied or placed (all points are applied near each tube).

本発明は、従来の技術における前記問題点に鑑みて成されたものであり、これを解決するため具体的に設定した課題は、ろうの流れ性を効果的に改善して、角部へ供給されるろう材の量を実質的に多くすることにより、前記問題点を解消したＥＧＲクーラーのろう付け構造及びろう付け方法を提供することにある。   The present invention has been made in view of the above-mentioned problems in the prior art, and the problem specifically set in order to solve this problem is to effectively improve the flowability of the wax and supply it to the corners. An object of the present invention is to provide a brazing structure and a brazing method for an EGR cooler that solves the above-mentioned problems by substantially increasing the amount of brazing material.

前記課題が効果的に解決できるＥＧＲクーラーのろう付け構造及びろう付け方法を特定するために必要と認める事項の全てが網羅され具体的に構成された課題解決手段を以下に示す。すなわち、
本発明におけるＥＧＲクーラーのろう付け構造に係る第１の課題解決手段は、シェル端部のエンドプレートに必要個数のチューブを嵌合したときに、前記エンドプレートと前記エンドプレートと嵌合する前記各チューブの端部との間の嵌合部により形成される角部と、エンドプレートに嵌合されたチューブをグループ分けして各グループの中心部にそれぞれのグループ用に刻設され、ろう材設置箇所となる溝と、この各ろう材設置箇所となる溝から該当するグループ内の上記角部まで連通するように刻設した溝とを具備したことを特徴とするものである。 The problem solving means that is specifically configured to cover all the matters recognized as necessary for specifying the brazing structure and brazing method of the EGR cooler that can effectively solve the above problems will be described below. That is,
The first problem solving means according to the brazing structure of the EGR cooler in the present invention is that each of the end plates and the end plates is fitted when a necessary number of tubes are fitted to the end plate of the shell end. The corner part formed by the fitting part between the ends of the tube and the tube fitted to the end plate are grouped and engraved for each group at the center of each group, brazing material installed It is characterized by comprising a groove to be a place and a groove cut so as to communicate from the groove to be a place where each brazing material is placed to the corner in the corresponding group.

本発明におけるＥＧＲクーラーのろう付け方法に係る第１の課題解決手段は、シェル端部のエンドプレートに嵌合した必要個数のチューブをグループ分けし、各グループの中心部に刻設されたろう材設置箇所となる溝にろう材を設け、加熱してろう材を溶融し、前記ろう材設置箇所となる溝から前記エンドプレートと前記エンドプレートと嵌合する前記各チューブの端部との間の嵌合部に形成される角部へ連通する溝を介して溶融したろう材を流し、前記各角部を接合するとともに前記各角部の間隙を密封することを特徴とするものである。   The first problem solving means relating to the brazing method of the EGR cooler in the present invention is to group the necessary number of tubes fitted to the end plate of the shell end, and to install the brazing material engraved at the center of each group A brazing material is provided in the groove serving as the location, and the brazing material is melted by heating, and the fitting between the end plate and the end of each tube that fits the end plate from the groove serving as the brazing material installation location. The molten brazing material is poured through a groove communicating with the corner formed at the joint, and the corners are joined and the gaps between the corners are sealed.

以上のように本発明におけるＥＧＲクーラーのろう付け構造に係る第１の課題解決手段では、チューブ本数が多い場合やエンドプレート中央部にろう材設置箇所を集中的に設置できない場合にも、各グループの中心部にそれぞれのグループ用のろう材設置箇所となる溝から該当するグループ内のエンドプレートとエンドプレートに嵌合されたチューブとにより形成される角部へろう材を供給してろう接することができ、ろう付け時におけるろう材の保持力が増してろう材の脱落を防止でき、溶融したろう材が各グループ内の各角部に溝を介して流されて各角部を接合するとともに各角部の間隙を密封することができる。また、ろう材溶融時にろうが流れる溝が形成されているためろう材が必要な箇所に確実に供給できてろう材の安定供給が図れるため接着が確実に行なえるようになり、ろう付け時のろうの流れを改善することができ、ろうダレやろう食われ等による未接着が減少し、またろう材のろう付け前の脱落が防止できるとともにろう材設置箇所が減るためろう材の供給量が減少し、製品及びろう材の歩留まりが良くなり、品質向上に寄与し、供給装置の簡素化が図れる。   As described above, in the first problem solving means relating to the brazing structure of the EGR cooler according to the present invention, each group can be used even when the number of tubes is large or the brazing material installation location cannot be centrally installed at the center of the end plate. The brazing material is supplied to the corner portion formed by the end plate in the corresponding group and the tube fitted to the end plate from the groove serving as the brazing material installation place for each group at the center of the brazing. The brazing material can be retained at the time of brazing and the brazing material can be prevented from falling off, and the molten brazing material is flowed through the groove to each corner in each group to join each corner. The gap at each corner can be sealed. In addition, since a groove through which the brazing material flows is formed when the brazing material is melted, the brazing material can be reliably supplied to the necessary location, and the brazing material can be supplied stably, so that the bonding can be performed reliably. The flow of brazing can be improved, unbonded due to brazing and brazing, etc. can be reduced, and the brazing material can be prevented from falling off before brazing, and the number of brazing material installation locations can be reduced. This reduces the yield of products and brazing materials, contributes to quality improvement, and simplifies the supply device.

本発明におけるＥＧＲクーラーのろう付け方法に係る第１の課題解決手段では、チューブ本数が多い場合やエンドプレート中央部にろう材設置箇所を集中的に設置できない場合でも、各角部に各グループ内の溝を介してろう材の安定供給が図れるようになって接合部を確実に接合できるとともにろうダレ、ろう食われ等に依る未接合が減少し、歩留まりが良くなり、品質が向上し、コストが低減できる。   In the first problem solving means relating to the brazing method of the EGR cooler in the present invention, even when the number of tubes is large or the brazing material installation location cannot be centrally installed at the center portion of the end plate, The brazing material can be supplied stably through the grooves, and the joints can be securely joined, while unjoined parts due to brazing and brazing are reduced, yield is improved, quality is improved, and cost is reduced. Can be reduced.

以下、本発明の最良の実施形態を具体的に図示説明する。
なお、この実施形態は、発明の主旨をより良く理解させるため具体的に説明するものであり、特に指定のない限り、特許請求の範囲の内容を限定するものではない。 Hereinafter, the best embodiment of the present invention will be described in detail.
This embodiment is specifically described for better understanding of the gist of the invention, and does not limit the content of the claims unless otherwise specified.

〔構成〕
この実施形態におけるＥＧＲクーラーのろう付け構造及びろう付け方法は、図１,２に示すように、ＥＧＲクーラー１０のシェル１１の端部にろう付けするエンドプレート１２と、このエンドプレート１２から立ち上がる各チューブ１３,…,１３の端部１３ａ,…,１３ａにより形成される角部１４,…,１４と、エンドプレート１２の中心部に形成したろう材設置箇所１５とを連通する溝１６,…,１６を刻設する。（図１） 〔Constitution〕
As shown in FIGS. 1 and 2, an EGR cooler brazing structure and a brazing method in this embodiment include an end plate 12 brazed to the end of the shell 11 of the EGR cooler 10, and each of the end plates 12 rising from the end plate 12. .., 13 formed by the end portions 13a, ..., 13a of the tubes 13, ..., 13 and the grooves 16, ..., communicating with the brazing material installation location 15 formed at the center of the end plate 12. 16 is engraved. (Figure 1)

ろう材設置箇所１５と各溝１６,…,１６とは、図２（Ａ）,（Ｂ）に示すように、断面がＶ，Ｕ或は角溝等、任意の形状を選択可能とし、溝幅及び溝深さ等はエンドプレート１２の形状安定性に支障のない範囲の寸法に形成する。ろう材設置箇所１５はエンドプレート１２の中心部に専用の凹みとして設けるか又は各溝１６,…,１６の交点として形成し、各溝１６,…,１６はろう材設置箇所１５から各角部１４,…,１４の形成位置まで放射方向に一定の深さで延設する。   As shown in FIGS. 2 (A) and 2 (B), the brazing material installation location 15 and the grooves 16,..., 16 can be selected in any shape such as a V, U or square groove in section. The width, the groove depth, and the like are formed to dimensions that do not hinder the shape stability of the end plate 12. The brazing material installation location 15 is provided as a dedicated recess in the center of the end plate 12 or formed as an intersection of the grooves 16,..., 16. 14,..., 14 is extended to a formation position at a certain depth in the radial direction.

ろう材はＥＧＲクーラー接合用ニッケルろう材を用い、注射器状に形成されたろう材注入装置により、ろう材設置箇所１５と各溝１６,…,１６との両方又はろう材設置箇所１５だけに塗布或は盛付ける。
その後、ろう材を乾燥して、加熱炉に導入できる状態にする。 The brazing material is a nickel brazing material for EGR cooler joining, and is applied to both the brazing material installation location 15 and each of the grooves 16,. Will serve.
Thereafter, the brazing material is dried so that it can be introduced into the heating furnace.

〔製造〕
ＥＧＲクーラー１０のシェル１１に各チューブ１３の端部１３ａを取り付けたエンドプレート１２を嵌め込み、エンドプレート１２の外面に刻設されたろう材設置箇所１５と溝１６,…,１６との両方又はろう材設置箇所１５だけにペースト状ろう材を塗布或は盛付けて、ペースト状ろう材を乾燥し、加熱炉に導入できる状態にして準備作業を完了する。
加熱炉が準備でき次第、ろう材を設けたＥＧＲクーラー１０の組立品を導入し、所定温度まで加熱する。ろう材が溶融すると、各溝１６,…,１６を流れてそれぞれの角部１４,…,１４に達し、エンドプレート１２とそれぞれのチューブ１３,…,１３との間の間隙を埋めるとともに角部外周側にフィレットを形成して密封し、硬化して接合する。 [Manufacturing]
The end plate 12 with the end portion 13a of each tube 13 attached to the shell 11 of the EGR cooler 10 is fitted, and both the brazing material installation location 15 and the grooves 16,. The paste-like brazing material is applied or placed only at the installation location 15, the paste-like brazing material is dried, and the preparation work is completed in a state where it can be introduced into the heating furnace.
As soon as the heating furnace is prepared, an assembly of the EGR cooler 10 provided with the brazing material is introduced and heated to a predetermined temperature. When the brazing material is melted, it flows through the grooves 16, ..., 16 to reach the respective corners 14, ..., 14, and fills the gaps between the end plate 12 and the respective tubes 13, ..., 13 and corners. A fillet is formed on the outer peripheral side, sealed, cured and joined.

〔作用効果〕
このような実施形態では、ろう材設置箇所１５を各溝１６,…,１６により各角部１４,…,１４と連通したから、ろう材の保持力が増してろう材の脱落を防止でき、溶融したろう材が各溝１６,…,１６を流れて各角部１４,…,１４へ達することができるようになって、ろう流れ性を向上することができる。 [Function and effect]
In such an embodiment, since the brazing material installation location 15 is communicated with each corner portion 14,..., 14 by the respective grooves 16,. The molten brazing material can flow through the grooves 16,... 16 to reach the corners 14,.

これにより、ろう材の安定供給が図れるようになって接合部を確実に接合できるとともに、ろうダレ、ろう食われ等に依る未接合が減少し、歩留まりが良くなり、品質が向上し、コストが低下する。
また、ろう材設置箇所１５と各溝１６,…,１６とがエンドプレート１２の中央部に集中するため、ろう材設置箇所が減少するとともにろう材使用量が減少し、コスト低減に寄与する。 As a result, a stable supply of brazing material can be achieved and the joint can be reliably joined, and unjoined parts due to brazing and brazing are reduced, yield is improved, quality is improved, and cost is reduced. descend.
Moreover, since the brazing material installation location 15 and the grooves 16,..., 16 are concentrated in the central portion of the end plate 12, the brazing material installation location is reduced and the amount of brazing material used is reduced, contributing to cost reduction.

さらに、ろう材注入装置がロボットに取り付けられて、ろう材がエンドプレート１２の中央部に自動供給されるため、ろう材供給位置がエンドプレート１２の中央部に固定されることから、ロボットの動作が簡素化され、ろう材供給に係るロボットの制御およびティーチング等が容易にできて工程の簡素化が図れるとともに、ろう材供給速度が速くなり、生産効率が向上し、製造コストを低減することができる。   Further, since the brazing material injection device is attached to the robot and the brazing material is automatically supplied to the central portion of the end plate 12, the brazing material supply position is fixed to the central portion of the end plate 12. This simplifies the process and simplifies the process by controlling the robot and teaching for supplying the brazing filler metal, speeding up the brazing filler metal feeding speed, improving production efficiency, and reducing manufacturing costs. it can.

〔別態様〕
この実施形態は、発明の主旨を理解し易くするため具体的に説明したものであり、発明内容を限定するためのものではないから、特に説明されていない別の態様を制限するものではなく、適宜変更しても良い。
このような意味で発明の主旨に沿う別態様を以下に示す。
例えば、図３に示すように、チューブ１３の数が多い場合、あるいは中央部にろう材設置箇所を集中的に設置できない場合には、エンドプレート１２内のチューブ１３,…,１３をグループ分けして、各グループの中心部にそれぞれのグループ用ろう材設置箇所を兼用した溝１６,…,１６を設け、そのグループ用ろう材設置箇所から該当するグループ内のチューブ１３,…,１３とエンドプレート１２とが形成する角部１４,…,１４に連通する直線状又は折れ線状の溝１６,…,１６を刻設するようにしても良い。
また、他の別態様としては、長い直線をそのままろう材設置箇所として利用するとともに、角部１４,…,１４と交叉する直線同士が交わることにより互いの溝１６,…,１６が連通し合うように形成した格子状連通路（図示せず）を形成する直線状連通路の組合せとしても良い。 [Another aspect]
This embodiment is specifically described in order to facilitate understanding of the gist of the invention, and is not intended to limit the content of the invention. Therefore, this embodiment does not limit other aspects not specifically described. You may change suitably.
In this sense, another embodiment that meets the gist of the invention is shown below.
For example, as shown in FIG. 3, when the number of tubes 13 is large, or when brazing material installation locations cannot be centrally installed at the center, the tubes 13,... In addition, grooves 16,..., 16 are also provided at the center of each group that also serve as the brazing material installation location for each group, and the tubes 13,... , 16 may be formed by engraving linear or broken grooves 16,..., 16 communicating with the corners 14,.
Moreover, as another aspect, while using a long straight line as a brazing material installation place as it is, the straight lines intersecting with the corner portions 14,..., 14 cross each other so that the grooves 16,. It is good also as a combination of the linear communication path which forms the lattice-shaped communication path (not shown) formed in this way.

本発明の実施形態におけるＥＧＲクーラーのろう付けを示す斜視説明図である。It is a perspective explanatory view showing brazing of an EGR cooler in an embodiment of the present invention. 同上実施形態におけるエンドプレートを示す説明図であり、（Ａ）は平面図、（Ｂ）は（Ａ）におけるＢ−Ｂ線で示す断面図である。It is explanatory drawing which shows the end plate in embodiment same as the above, (A) is a top view, (B) is sectional drawing shown by the BB line in (A). 同上実施形態に対する別態様を示す平面図である。It is a top view which shows another aspect with respect to embodiment same as the above. 従来のＥＧＲクーラーのろう付けを示す斜視説明図である。It is a perspective explanatory view showing brazing of the conventional EGR cooler.

符号の説明Explanation of symbols

１０ ＥＧＲクーラー
１１ シェル
１２ エンドプレート
１３ チューブ
１３ａ 端部
１４ 角部
１５ ろう材設置箇所
１６ 溝 10 EGR cooler 11 Shell 12 End plate 13 Tube 13a End 14 Corner 15 Brazing material installation location 16 Groove

Claims (2)

シェル端部のエンドプレートに必要個数のチューブを嵌合したときに、前記エンドプレートと前記エンドプレートと嵌合する前記各チューブの端部との間の嵌合部により形成される角部と、
エンドプレートに嵌合されたチューブをグループ分けして各グループの中心部にそれぞれのグループ用に刻設され、ろう材設置箇所となる溝と、
この各ろう材設置箇所となる溝から該当するグループ内の上記角部まで連通するように刻設した溝と
を具備したことを特徴とするＥＧＲクーラーのろう付け構造。 When a necessary number of tubes are fitted to the end plate of the shell end, a corner formed by a fitting portion between the end plate and the end of each tube fitted to the end plate;
The tubes fitted to the end plate are grouped and engraved for each group at the center of each group, and a groove that becomes a brazing material installation location,
A groove engraved so as to communicate from the groove serving as the brazing material installation location to the corner in the group.
A brazing structure for an EGR cooler , comprising: シェル端部のエンドプレートに嵌合した必要個数のチューブをグループ分けし、各グループの中心部に刻設されたろう材設置箇所となる溝にろう材を設け、加熱してろう材を溶融し、前記ろう材設置箇所となる溝から前記エンドプレートと前記エンドプレートと嵌合する前記各チューブの端部との間の嵌合部に形成される角部へ連通する溝を介して溶融したろう材を流し、前記各角部を接合するとともに前記各角部の間隙を密封することを特徴とするＥＧＲクーラーのろう付け方法。 The necessary number of tubes fitted to the end plate of the shell end are grouped, and a brazing material is provided in a groove that is engraved at the center of each group, and the brazing material is melted by heating. The brazing material melted through a groove communicating with a corner portion formed at a fitting portion between the end plate and an end portion of each tube fitted to the end plate from the groove serving as the brazing material installation location. And brazing the EGR cooler , wherein the corners are joined and the gaps between the corners are sealed .
JP2004041544A 2004-02-18 2004-02-18 Brazing structure and brazing method for EGR cooler Expired - Lifetime JP3905522B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101507588B1 (en) * 2013-08-21 2015-04-07 주식회사 디엠씨코리아 Non-welding type clear water cooler and manufacturing method of the same

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100288478A1 (en) * 2009-05-12 2010-11-18 Lawrence Barron Remanufactured Exhaust Gas Recirculation Cooler and Method for Remanufacturing a Cooler

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101507588B1 (en) * 2013-08-21 2015-04-07 주식회사 디엠씨코리아 Non-welding type clear water cooler and manufacturing method of the same

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