JP6645615B2 - Joining method - Google Patents

Joining method Download PDF

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JP6645615B2
JP6645615B2 JP2019501077A JP2019501077A JP6645615B2 JP 6645615 B2 JP6645615 B2 JP 6645615B2 JP 2019501077 A JP2019501077 A JP 2019501077A JP 2019501077 A JP2019501077 A JP 2019501077A JP 6645615 B2 JP6645615 B2 JP 6645615B2
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metal member
superposed
friction stir
overlapping
stirring
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JPWO2018154939A1 (en
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堀　久司
久司 堀
将視 尾尻
将視 尾尻
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Nippon Light Metal Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K1/00—Soldering, e.g. brazing, or unsoldering
    • B23K1/14—Soldering, e.g. brazing, or unsoldering specially adapted for soldering seams
    • 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
    • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • B23K20/12—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)

Description

本発明は、接合方法に関する。   The present invention relates to a joining method.

第一金属部材の端面と第二金属部材の端面とを突き合わせて形成された突合せ部に対して、回転ツールを用いて摩擦攪拌接合する技術が知られている（特許文献１参照）。当該接合方法では、突合せ部の周囲に回転ツールを相対移動させて、突合せ部の全周に亘って摩擦攪拌接合を行うというものである。   2. Description of the Related Art There is known a technique of performing friction stir welding using a rotary tool on an abutting portion formed by abutting an end surface of a first metal member and an end surface of a second metal member (see Patent Document 1). In the joining method, a rotary tool is relatively moved around the butted portion, and friction stir welding is performed over the entire circumference of the butted portion.

特開２００８−３０７５７０号公報JP 2008-307570 A

しかし、突合せ部の面積が大きい場合、回転ツールの攪拌ピンを第一金属部材及び第二金属部材の中央部まで挿入することができない。そのため、摩擦攪拌接合によって接合される部位は、第一金属部材及び第二金属部材の外周囲のみで、中央部に関しては未接合となる。よって、第一金属部材と第二金属部材の接合強度が低いという問題がある。   However, when the area of the butted portion is large, the stirring pin of the rotating tool cannot be inserted to the center of the first metal member and the second metal member. Therefore, the portions to be joined by the friction stir welding are only the outer periphery of the first metal member and the second metal member, and the center portion is not joined. Therefore, there is a problem that the joining strength between the first metal member and the second metal member is low.

このような観点から、本発明は、第一金属部材と第二金属部材を摩擦攪拌接合する際に、接合強度を高めることができる接合方法を提供することを課題とする。   From such a viewpoint, an object of the present invention is to provide a joining method that can increase joining strength when friction stir joining is performed between a first metal member and a second metal member.

このような課題を解決するために本発明は、アルミニウム合金製の第一金属部材及び第二金属部材を用意する準備工程と、前記第一金属部材及び前記第二金属部材の重ね合わせ面同士を重ね合わせて重合部を形成する際に、前記重ね合わせ面同士の間にＡｌ−Ｓｉ−Ｍｇ系の単層ブレージングシートを挟み込む重ね合わせ工程と、前記重ね合わせ工程後、前記第一金属部材及び前記第二金属部材を押圧しながら前記単層ブレージングシートの固相線温度以上に加熱して、前記第一金属部材と前記第二金属部材とを面ろう付けする面ろう付け工程と、前記面ろう付け工程後、回転ツールの攪拌ピンを前記第一金属部材及び前記第二金属部材の側面から挿入し、前記攪拌ピンを前記第一金属部材及び前記第二金属部材の両方に接触させつつの全周に亘って前記重合部を摩擦攪拌する摩擦攪拌工程と、を含むことを特徴とする。
また、本発明は、アルミニウム合金製の第一金属部材及び第二金属部材を用意する準備工程と、前記第一金属部材及び前記第二金属部材の重ね合わせ面同士を重ね合わせて重合部を形成する際に、前記重ね合わせ面同士の間にＡｌ−Ｓｉ−Ｍｇ系の単層ブレージングシートを挟み込む重ね合わせ工程と、前記重ね合わせ工程後、前記第一金属部材及び前記第二金属部材を押圧しながら前記単層ブレージングシートの固相線温度以上に加熱して、前記第一金属部材及び前記第二金属部材を面ろう付けする面ろう付け工程と、前記面ろう付け工程後、回転ツールの攪拌ピンを前記第二金属部材の表面から挿入し、前記攪拌ピンを前記第一金属部材及び前記第二金属部材の両方、又は、前記第二金属部材のみに接触させつつ全周に亘って前記重合部を摩擦攪拌する摩擦攪拌工程と、を含むことを特徴とする。
また、本発明は、重ね合わされる重ね合わせ面の面積が異なるアルミニウム合金製の第一金属部材及び第二金属部材を用意する準備工程と、前記第一金属部材及び前記第二金属部材の重ね合わせ面同士を重ね合わせて重合部を形成する際に、前記重ね合わせ面同士の間にＡｌ−Ｓｉ−Ｍｇ系の単層ブレージングシートを挟み込む重ね合わせ工程と、前記重ね合わせ工程後、前記第一金属部材及び前記第二金属部材を押圧しながら前記単層ブレージングシートの固相線温度以上に加熱して、前記第一金属部材及び前記第二金属部材を面ろう付けする面ろう付け工程と、前記面ろう付け工程後、回転ツールの攪拌ピンを前記第一金属部材と第二金属部材とで構成される内隅から挿入し、全周に亘って前記重合部を摩擦攪拌する摩擦攪拌工程と、を含むことを特徴とする。In order to solve such a problem, the present invention provides a preparation step of preparing a first metal member and a second metal member made of an aluminum alloy, and overlapping surfaces of the first metal member and the second metal member. When forming an overlapped portion by superimposing, a superposing step of sandwiching an Al-Si-Mg based single-layer brazing sheet between the superposed surfaces, and after the superposing step, the first metal member and the A surface brazing step of heating the single-layer brazing sheet to a solidus temperature or higher while pressing the second metal member to braze the first metal member and the second metal member, and After the attaching step, the stirring pin of the rotating tool is inserted from a side surface of the first metal member and the second metal member, and the entirety of the stirring tool while the stirring pin is in contact with both the first metal member and the second metal member. Week Over and characterized in that it comprises a friction stirring step for stirring friction the polymerization unit.
Further, the present invention provides a preparation step of preparing a first metal member and a second metal member made of an aluminum alloy, and forming a superposed portion by overlapping the superposed surfaces of the first metal member and the second metal member. When doing, a superposition step of sandwiching an Al-Si-Mg based single-layer brazing sheet between the superposition surfaces, and after the superposition step, pressing the first metal member and the second metal member A surface brazing step of heating the single-layer brazing sheet to a temperature equal to or higher than the solidus temperature of the single-layer brazing sheet while brazing the first metal member and the second metal member, and stirring the rotating tool after the surface brazing step A pin is inserted from the surface of the second metal member, and the polymerization is performed over the entire circumference while contacting the stirring pin with both the first metal member and the second metal member or only the second metal member. Department And friction stir step of friction stir, characterized in that it comprises a.
Further, the present invention provides a preparation step of preparing a first metal member and a second metal member made of aluminum alloy having different areas of a superimposed surface to be superimposed, and superimposing the first metal member and the second metal member. An overlapping step of sandwiching an Al-Si-Mg-based single-layer brazing sheet between the overlapping surfaces when forming overlapping portions by overlapping the surfaces, and after the overlapping step, the first metal Heating the single-layer brazing sheet to a solidus temperature or higher while pressing the member and the second metal member, and a surface brazing step of surface brazing the first metal member and the second metal member, After the surface brazing step, a stirring pin of the rotating tool is inserted from an inner corner formed by the first metal member and the second metal member, and a friction stir step of friction-stirring the overlapped portion over the entire circumference, To And wherein the Mukoto.

かかる接合方法によれば、第一金属部材と第二金属部材の中央部は面ろう付けで接合されるとともに、外周縁は摩擦攪拌接合されるため、接合強度を高めることができる。   According to this joining method, the central portions of the first metal member and the second metal member are joined by surface brazing, and the outer peripheral edges are joined by friction stir welding, so that joining strength can be increased.

また、前記重ね合わせ工程の前に、前記第一金属部材の重ね合わせ面及び前記第二金属部材の重ね合わせ面の少なくともいずれかの周縁部に沿って凹溝を設ける凹溝形成工程を含み、前記重ね合わせ工程では、前記重ね合わせ面のうち前記凹溝の内側に前記単層ブレージングシートを挟み込むことが好ましい。   Also, before the superimposing step, the method includes a groove forming step of providing a groove along at least one peripheral portion of the superposed surface of the first metal member and the superposed surface of the second metal member, In the overlapping step, it is preferable that the single-layer brazing sheet is sandwiched inside the concave groove on the overlapping surface.

かかる接合方法によれば、面ろう付け工程の際に外側に押し出されたろう材は、凹溝に溜まる。これにより、第一金属部材及び第二金属部材の外部にろう材が漏れ出るのを防ぐことができる。   According to such a joining method, the brazing material extruded outward during the surface brazing process accumulates in the groove. This can prevent the brazing material from leaking out of the first metal member and the second metal member.

また、前記摩擦攪拌工程では、前記回転ツールの前記攪拌ピンのみを前記第一金属部材及び前記第二金属部材の両方に接触させた状態で摩擦攪拌を行うことが好ましい。
また、前記摩擦攪拌工程では、前記回転ツールの前記攪拌ピンのみを前記第一金属部材及び前記第二金属部材の両方、又は、前記第二金属部材のみに接触させた状態で摩擦攪拌を行うことが好ましい。Further, in the friction stirring step, it is preferable that the friction stirring is performed in a state where only the stirring pin of the rotating tool is in contact with both the first metal member and the second metal member.
Further, in the friction stir step, friction stir is performed in a state where only the stirring pin of the rotating tool is in contact with both the first metal member and the second metal member or only the second metal member. Is preferred.

かかる接合方法によれば、摩擦攪拌装置にかかる負荷を軽減することができる。   According to this joining method, the load on the friction stirrer can be reduced.

また、前記摩擦攪拌工程では、前記凹溝よりも外側において前記回転ツールを相対移動させて摩擦攪拌を行うことが好ましい。   Further, in the friction stir step, it is preferable that the rotary tool is relatively moved outside the groove to perform friction stir.

また、本発明は、アルミニウム合金からなる第一金属部材及び第二金属部材を用意する準備工程と、前記第一金属部材及び前記第二金属部材の重ね合わせ面同士を重ね合わせて重合部を形成する際に、前記重ね合わせ面同士の間に銅箔又は銅合金箔を挟み込む重ね合わせ工程と、前記重ね合わせ工程後、前記第一金属部材及び前記第二金属部材を押圧しながら５１０℃以上に加熱して、前記第一金属部材と前記第二金属部材とを拡散接合する拡散接合工程と、前記拡散接合工程後、回転ツールの攪拌ピンを前記第一金属部材及び前記第二金属部材の側面から挿入し、全周に亘って前記重合部を摩擦攪拌する摩擦攪拌工程と、を含むことを特徴とする。
また、本発明は、アルミニウム合金からなる第一金属部材及び第二金属部材を用意する準備工程と、前記第一金属部材及び前記第二金属部材の重ね合わせ面同士を重ね合わせて重合部を形成する際に、前記重ね合わせ面同士の間に銅箔又は銅合金箔を挟み込む重ね合わせ工程と、前記重ね合わせ工程後、前記第一金属部材及び前記第二金属部材を押圧しながら５１０℃以上に加熱して、前記第一金属部材と前記第二金属部材とを拡散接合する拡散接合工程と、前記拡散接合工程後、回転ツールの攪拌ピンを前記第二金属部材の表面から挿入し、前記攪拌ピンを前記第一金属部材及び前記第二金属部材の両方、又は、前記第二金属部材のみに接触させつつ全周に亘って前記重合部を摩擦攪拌する摩擦攪拌工程と、を含むことを特徴とする。
また、本発明は、重ね合わされる重ね合わせ面の面積が異なるアルミニウム合金からなる第一金属部材及び第二金属部材を用意する準備工程と、前記第一金属部材及び前記第二金属部材の重ね合わせ面同士を重ね合わせて重合部を形成する際に、前記重ね合わせ面同士の間に銅箔又は銅合金箔を挟み込む重ね合わせ工程と、前記重ね合わせ工程後に、前記第一金属部材及び前記第二金属部材を押圧しながら５１０℃以上に加熱して、前記第一金属部材及び前記第二金属部材を拡散接合する拡散接合工程と、前記拡散接合工程後、回転ツールの攪拌ピンを前記第一金属部材と第二金属部材とで構成される内隅から挿入し、全周に亘って前記重合部を摩擦攪拌する摩擦攪拌工程と、を含むことを特徴とする。Further, the present invention provides a preparation step of preparing a first metal member and a second metal member made of an aluminum alloy, and forming an overlapped portion by overlapping the superposed surfaces of the first metal member and the second metal member. When doing, a superimposing step of sandwiching a copper foil or a copper alloy foil between the superimposed surfaces, after the superimposing step, while pressing the first metal member and the second metal member to 510 ℃ or more A diffusion bonding step of heating and diffusion bonding the first metal member and the second metal member; and after the diffusion bonding step, a stirring pin of a rotating tool is attached to a side surface of the first metal member and the second metal member. And a friction stir step of friction-stirring the overlapped portion over the entire circumference.
Further, the present invention provides a preparation step of preparing a first metal member and a second metal member made of an aluminum alloy, and forming an overlapped portion by overlapping the superposed surfaces of the first metal member and the second metal member. When doing, a superimposing step of sandwiching a copper foil or a copper alloy foil between the superimposed surfaces, after the superimposing step, while pressing the first metal member and the second metal member to 510 ℃ or more Heating, a diffusion bonding step of diffusion bonding the first metal member and the second metal member, and after the diffusion bonding step, a stirring pin of a rotary tool is inserted from the surface of the second metal member, and the stirring is performed. A friction stir step of friction stirring the overlapping portion over the entire circumference while contacting the pin with both the first metal member and the second metal member, or only the second metal member. And
Further, the present invention provides a preparation step of preparing a first metal member and a second metal member made of an aluminum alloy having different areas of superimposed surfaces to be superimposed, and superimposing the first metal member and the second metal member. When superimposing surfaces to form an overlapped portion, a superposing step of sandwiching a copper foil or a copper alloy foil between the superposed surfaces, and after the superposing step, the first metal member and the second A diffusion joining step of diffusing and joining the first metal member and the second metal member while heating the metal member to 510 ° C. or higher while pressing the metal member; A friction stir step of inserting from the inner corner formed by the member and the second metal member and friction-stirring the overlapped portion over the entire circumference.

かかる接合方法によれば、第一金属部材と第二金属部材の中央部は拡散接合されるとともに、外周縁は摩擦攪拌接合されるため、接合強度を高めることができる。   According to such a joining method, the central portions of the first metal member and the second metal member are diffusion-bonded, and the outer peripheral edges are friction-stir-welded, so that the joining strength can be increased.

また、前記重ね合わせ工程の前に、前記第一金属部材の重ね合わせ面及び前記第二金属部材の重ね合わせ面の少なくともいずれかの周縁部に沿って凹溝を設ける凹溝形成工程を含み、前記重ね合わせ工程では、前記重ね合わせ面のうち前記凹溝の内側に前記銅箔又は前記銅合金箔を挟み込むことが好ましい。   Also, before the superimposing step, the method includes a groove forming step of providing a groove along at least one peripheral portion of the superposed surface of the first metal member and the superposed surface of the second metal member, In the overlapping step, it is preferable that the copper foil or the copper alloy foil be sandwiched inside the concave groove in the overlapping surface.

かかる接合方法によれば、拡散接合工程の際に外側に押し出されたＡｌ−Ｃｕ−Ｓｉ融液は、凹溝に溜まる。これにより、第一金属部材及び第二金属部材の外部にＡｌ−Ｃｕ−Ｓｉ融液が漏れ出るのを防ぐことができる。   According to such a bonding method, the Al-Cu-Si melt extruded outward during the diffusion bonding step accumulates in the groove. Thereby, it is possible to prevent the Al-Cu-Si melt from leaking out of the first metal member and the second metal member.

また、前記摩擦攪拌工程では、前記回転ツールの前記攪拌ピンのみを前記第一金属部材及び前記第二金属部材の両方に接触させた状態で摩擦攪拌を行うことが好ましい。
また、前記摩擦攪拌工程では、前記回転ツールの前記攪拌ピンのみを前記第一金属部材及び前記第二金属部材の両方、又は、前記第二金属部材のみに接触させた状態で摩擦攪拌を行うことが好ましい。Further, in the friction stirring step, it is preferable that the friction stirring is performed in a state where only the stirring pin of the rotating tool is in contact with both the first metal member and the second metal member.
Further, in the friction stir step, friction stir is performed in a state where only the stirring pin of the rotating tool is in contact with both the first metal member and the second metal member or only the second metal member. Is preferred.

かかる接合方法によれば、摩擦攪拌装置にかかる負荷を軽減することができる。   According to this joining method, the load on the friction stirrer can be reduced.

また、前記摩擦攪拌工程では、前記凹溝よりも外側において前記回転ツールを相対移動させて摩擦攪拌を行うことが好ましい。   Further, in the friction stir step, it is preferable that the rotary tool is relatively moved outside the groove to perform friction stir.

かかる接合方法によれば、塑性化領域に銅が混入するのを防ぐことができる。   According to such a joining method, it is possible to prevent copper from being mixed into the plasticized region.

本発明に係る接合方法によれば、接合強度を高めることができる。   According to the joining method according to the present invention, the joining strength can be increased.

本発明の第一実施形態に係る接合方法の準備工程を示す分解斜視図である。FIG. 3 is an exploded perspective view illustrating a preparation step of the bonding method according to the first embodiment of the present invention. 第一実施形態に係る接合方法の重ね合わせ工程を示す断面図である。FIG. 4 is a cross-sectional view illustrating an overlapping step of the bonding method according to the first embodiment. 第一実施形態に係る接合方法の面ろう付け工程を示す断面図である。It is sectional drawing which shows the surface brazing process of the joining method concerning 1st embodiment. 第一実施形態に係る接合方法の摩擦攪拌工程を示す斜視図である。It is a perspective view showing the friction stir process of the joining method concerning a first embodiment. 第一実施形態に係る接合方法の摩擦攪拌工程を示す断面図である。It is sectional drawing which shows the friction stirring process of the joining method concerning 1st embodiment. 本発明の第二実施形態に係る接合方法の摩擦攪拌工程を示す斜視図である。It is a perspective view showing the friction stir process of the joining method concerning a second embodiment of the present invention. 第二実施形態に係る接合方法の摩擦攪拌工程を示す断面図である。It is sectional drawing which shows the friction stirring process of the joining method concerning 2nd embodiment. 本発明の第三実施形態に係る接合方法の準備工程を示す分解斜視図である。It is an exploded perspective view showing the preparation process of the joining method concerning a third embodiment of the present invention. 第三実施形態に係る接合方法の重ね合わせ工程を示す断面図である。It is sectional drawing which shows the superposition process of the joining method which concerns on 3rd embodiment. 第三実施形態に係る接合方法の面ろう付け工程を示す断面図である。It is sectional drawing which shows the surface brazing process of the joining method concerning 3rd embodiment. 第三実施形態に係る接合方法の摩擦攪拌工程を示す斜視図である。It is a perspective view showing the friction stir process of the joining method concerning a third embodiment. 第三実施形態に係る接合方法の摩擦攪拌工程を示す断面図である。It is sectional drawing which shows the friction stir process of the joining method concerning 3rd embodiment. 本発明の第四実施形態に係る接合方法の準備工程を示す分解斜視図である。It is an exploded perspective view showing the preparation process of the joining method concerning a 4th embodiment of the present invention. 第四実施形態に係る接合方法の重ね合わせ工程を示す断面図である。It is sectional drawing which shows the superposition process of the joining method concerning 4th Embodiment. 第四実施形態に係る接合方法の拡散接合工程を示す断面図である。It is sectional drawing which shows the diffusion bonding process of the bonding method concerning 4th Embodiment. 第四実施形態に係る接合方法の摩擦攪拌工程を示す斜視図である。It is a perspective view showing the friction stir process of the joining method concerning a 4th embodiment. 第四実施形態に係る接合方法の摩擦攪拌工程を示す断面図である。It is sectional drawing which shows the friction stirring process of the joining method concerning 4th Embodiment. 本発明の第五実施形態に係る接合方法の摩擦攪拌工程を示す斜視図である。It is a perspective view showing the friction stir process of the joining method concerning a 5th embodiment of the present invention. 第五実施形態に係る接合方法の摩擦攪拌工程を示す断面図である。It is sectional drawing which shows the friction stirring process of the joining method concerning 5th Embodiment. 本発明の第六実施形態に係る接合方法の準備工程を示す分解斜視図である。It is an exploded perspective view showing a preparation process of a joining method concerning a sixth embodiment of the present invention. 第六実施形態に係る接合方法の重ね合わせ工程を示す断面図である。It is sectional drawing which shows the superposition process of the joining method which concerns on 6th Embodiment. 第六実施形態に係る接合方法の拡散接合工程を示す断面図である。It is sectional drawing which shows the diffusion bonding process of the bonding method concerning 6th Embodiment. 第六実施形態に係る接合方法の摩擦攪拌工程を示す斜視図である。It is a perspective view showing the friction stir process of the joining method concerning a 6th embodiment. 第六実施形態に係る接合方法の摩擦攪拌工程を示す断面図である。It is sectional drawing which shows the friction stirring process of the joining method concerning 6th Embodiment.

［第一実施形態］
本発明の第一実施形態について図面を参照して詳細に説明する。図１に示すように、第一実施形態に係る接合方法では、第一金属部材２と、第二金属部材３とを接合して、構造体１を形成する場合を例示する。なお、説明における「表面」とは「裏面」の反対側の面という意味である。本実施形態に係る接合方法では、準備工程と、凹溝形成工程と、重ね合わせ工程と、面ろう付け工程と、摩擦攪拌工程と、を行う。[First embodiment]
A first embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, in the joining method according to the first embodiment, a case where the first metal member 2 and the second metal member 3 are joined to form the structure 1 is illustrated. In the description, “front surface” means a surface opposite to “back surface”. In the joining method according to the present embodiment, a preparation step, a groove forming step, a superposition step, a surface brazing step, and a friction stir step are performed.

準備工程は、第一金属部材２及び第二金属部材３を用意する工程である。第一金属部材２は、略直方体を呈する金属部材である。第一金属部材２は、アルミニウム合金製である。第一金属部材２の４つの角部には丸面取り加工が施された面取り部が形成されている。第二金属部材３は、第一金属部材２と同等の形状及び材料になっている。第一金属部材２及び第二金属部材３の固相線温度は、例えば、約５８０〜６５０℃に設定することができ、本実施例形態では、第一金属部材２及び第二金属部材３を展伸材の３００３合金としているので、固相線温度は約６４３℃になっている。   The preparation step is a step of preparing the first metal member 2 and the second metal member 3. The first metal member 2 is a metal member having a substantially rectangular parallelepiped shape. The first metal member 2 is made of an aluminum alloy. The four corners of the first metal member 2 are formed with round chamfers. The second metal member 3 has the same shape and material as the first metal member 2. The solidus temperature of the first metal member 2 and the second metal member 3 can be set, for example, to about 580 to 650 ° C. In the present embodiment, the first metal member 2 and the second metal member 3 The solidus temperature is about 643 ° C. because of the wrought material 3003 alloy.

凹溝形成工程は、第一金属部材２及び第二金属部材３の重ね合わせ面の少なくとも一方に凹溝を形成する工程である。本実施形態の凹溝形成工程では、第一金属部材２の表面１３に凹溝１４を形成するとともに、第二金属部材３の裏面２３に凹溝２４を形成する。凹溝１４は、第一金属部材２の外周縁の内側において、外周縁に沿って枠状に形成される。凹溝１４の断面形状は特に制限されないが、本実施形態では断面半円状になっている。凹溝形成工程では、凹溝１４と同じ要領によって、第二金属部材３の裏面２３に凹溝２４を形成する。   The groove forming step is a step of forming a groove on at least one of the overlapping surfaces of the first metal member 2 and the second metal member 3. In the groove forming step of the present embodiment, a groove 14 is formed on the front surface 13 of the first metal member 2 and a groove 24 is formed on the back surface 23 of the second metal member 3. The concave groove 14 is formed in a frame shape along the outer peripheral edge inside the outer peripheral edge of the first metal member 2. The cross-sectional shape of the concave groove 14 is not particularly limited, but is a semicircular cross-section in the present embodiment. In the groove forming step, a groove 24 is formed on the back surface 23 of the second metal member 3 in the same manner as the groove 14.

重ね合わせ工程は、図２に示すように、第一金属部材２及び第二金属部材３の重ね合わせ面同士を重ね合わせて重合部Ｊ１を形成する際に、重ね合わせ面同士の間にＡｌ−Ｓｉ−Ｍｇ系の単層ブレージングシート４を挟み込む工程である。ブレージングシート４は、フラックスレス用ろう付け仕様であって、Ａｌ−Ｓｉ−Ｍｇ系合金ろう材からなる薄い単層シートである。ブレージングシート４は、凹溝１４，２４の内側に配置される大きさで形成されている。ブレージングシート４の厚さは、特に制限されないが、本実施形態では、例えば、約２０〜１００μｍである。   As shown in FIG. 2, in the overlapping step, when the overlapping surfaces of the first metal member 2 and the second metal member 3 are overlapped to form the overlapped portion J1, Al- This is a step of sandwiching the Si-Mg based single-layer brazing sheet 4. The brazing sheet 4 is a fluxless brazing specification, and is a thin single-layer sheet made of an Al-Si-Mg alloy brazing material. The brazing sheet 4 is formed in a size arranged inside the concave grooves 14 and 24. The thickness of the brazing sheet 4 is not particularly limited, but is, for example, about 20 to 100 μm in the present embodiment.

重ね合わせ工程では、第一金属部材２と第二金属部材３との間にブレージングシート４を挟みつつ、第一金属部材２の表面（重ね合わせ面）１３と、第二金属部材３の裏面（重ね合わせ面）２３とを重ね合わせる。これにより、重合部Ｊ１が形成される。   In the overlapping step, the front surface (overlapping surface) 13 of the first metal member 2 and the back surface (the back surface) of the second metal member 3 (with the brazing sheet 4 interposed between the first metal member 2 and the second metal member 3). (Overlapping surface) 23. Thereby, the overlapping portion J1 is formed.

面ろう付け工程は、図３に示すように、面ろう付けを行う工程である。ここで、ブレージングシート４中のＳｉは、その含有量によってブレージングシート４の液相線の温度を下げるとともに、面ろう付け中の濡れ性を改善するための元素である。Ｓｉ含有量が、１.０質量％に満たないと、ブレージングシート４の液相線の温度が高くなりすぎて、所定のろう付け温度に到達してもブレージングシート４の溶解が不十分となり、十分なろう付け強度（せん断応力）が得られない可能性がある。逆に、Ｓｉ含有量が、１２質量％を超えると、鋳造中に鋳塊中央部に初晶Ｓｉが析出（晶出）する可能性が高くなり、仮に健全な冷延板が得られたとしてもミクロ的に均質な組織のブレージングシート４を得ることが困難となる。
したがって、ろう材中のＳｉ含有量は、１.０〜１２質量％の範囲とする。より好まし
いＳｉ含有量は、２.０〜１２質量％の範囲である。さらに好ましいＳｉ含有量は、３．
０〜１２質量％の範囲である。The surface brazing step is a step of performing surface brazing as shown in FIG. Here, Si in the brazing sheet 4 is an element for lowering the liquidus temperature of the brazing sheet 4 and improving the wettability during surface brazing according to the content thereof. If the Si content is less than 1.0% by mass, the temperature of the liquidus of the brazing sheet 4 becomes too high, and even when the brazing temperature reaches a predetermined brazing temperature, the dissolution of the brazing sheet 4 becomes insufficient, There is a possibility that sufficient brazing strength (shear stress) cannot be obtained. Conversely, if the Si content exceeds 12% by mass, the possibility that primary Si precipitates (crystallizes) in the center of the ingot during casting increases, and if a healthy cold-rolled sheet is obtained, However, it is difficult to obtain a brazing sheet 4 having a microscopically uniform structure.
Therefore, the Si content in the brazing material is in the range of 1.0 to 12% by mass. A more preferred Si content is in the range of 2.0 to 12% by mass. More preferred Si content is 3.
It is in the range of 0 to 12% by mass.

ブレージングシート４中のＭｇは、自らが酸化されることにより、還元剤として作用するため、ろう付け加熱によるアルミニウム合金部材（第一金属部材２及び第二金属部材３）とブレージングシート４のろう材との界面におけるアルミニウムの酸化を抑制し、面ろう付け中の濡れ性を改善するための元素であると考えられる。Ｍｇ含有量が、０.１質量％に満たないと、ろう付け温度や保持時間にもよるが、その効果が不十分となり、十分なろう付け強度（せん断応力）が得られない可能性がある。逆に、Ｍｇ含有量が、５.０質量％を超えると、鋳塊を熱延する際のロールへの負荷が大きくなり、また耳割れも生じるため、冷延が困難となる。ろう材の加工性を考慮すると、Ｍｇ含有量は、低い方が好ましい。
したがって、ろう材中のＭｇ含有量は、０.１〜５.０質量％の範囲とする。より好まし
いＭｇ含有量は、０.１〜４.０質量％の範囲である。さらに好ましいＭｇ含有量は、０.
１〜３.０質量％の範囲である。Since Mg in the brazing sheet 4 itself acts as a reducing agent by being oxidized, the aluminum alloy members (the first metal member 2 and the second metal member 3) and the brazing material of the brazing sheet 4 are heated by brazing. It is considered to be an element for suppressing the oxidation of aluminum at the interface with, and improving the wettability during brazing of the surface. If the Mg content is less than 0.1% by mass, depending on the brazing temperature and the holding time, the effect is insufficient, and sufficient brazing strength (shear stress) may not be obtained. . Conversely, when the Mg content exceeds 5.0% by mass, the load on the roll when hot rolling the ingot becomes large, and ear cracks occur, so that cold rolling becomes difficult. Considering the workability of the brazing material, the lower the Mg content, the better.
Therefore, the Mg content in the brazing material is in the range of 0.1 to 5.0% by mass. A more preferred Mg content is in the range of 0.1 to 4.0% by mass. A more preferred Mg content is 0.1.
It is in the range of 1 to 3.0% by mass.

ブレージングシート４の残部はＡｌと不可避的不純物からなる。不可避的不純物としてはＦｅ、Ｃｕ、Ｍｎ、Ｚｎ等が挙げられるが、これら元素については、Ｆｅ：１.０質量％未満、Ｃｕ：１.０質量％未満、Ｍｎ：１.０質量％未満、Ｚｎ：１.０質量％未満の範囲であれば、本発明の効果を妨げるものではない。したがって、不可避的不純物としての前記成分含有量はそれぞれ１.０質量％未満とすることが好ましい。   The remainder of the brazing sheet 4 is composed of Al and inevitable impurities. Examples of the inevitable impurities include Fe, Cu, Mn, and Zn. For these elements, Fe: less than 1.0% by mass, Cu: less than 1.0% by mass, Mn: less than 1.0% by mass, If the Zn content is less than 1.0% by mass, the effects of the present invention are not hindered. Therefore, the content of each of the components as inevitable impurities is preferably less than 1.0% by mass.

面ろう付け工程では、第一金属部材２及び第二金属部材３が近接する方向に、所定の条件下で押圧力を付与して面ろう付けを行う。面ろう付け工程の条件は、第一金属部材２、第二金属部材３及びブレージングシート４の合金組成等によって適宜設定すればよい。本実施形態では、例えば、押圧力を約１０ＫＰａ以上、不活性ガス雰囲気とし、押圧状態を２分以上保持する。保持温度は、ブレージングシート４の固相線温度以上、且つ、第一金属部材２及び第二金属部材３の固相線温度よりも低く設定することが好ましい。本実施形態では、ブレージングシート４の固相線温度を５６０℃とし、第一金属部材２及び第二金属部材３を展伸材の３００３合金（固相線温度：６４３℃）としているので、ろう付け加熱時の保持温度を５６０℃〜６４３℃未満に設定することが望ましい。不活性ガスは、例えば、窒素、アルゴン、ヘリウムを用いることができる。また、窒素ガスとしては、酸素濃度：１０ｐｐｍ以下に規制された工業用窒素ガスを用いることが望ましい。   In the surface brazing step, surface brazing is performed by applying a pressing force in a direction in which the first metal member 2 and the second metal member 3 approach each other under predetermined conditions. The conditions of the surface brazing step may be appropriately set according to the alloy composition of the first metal member 2, the second metal member 3, the brazing sheet 4, and the like. In the present embodiment, for example, the pressing force is set to about 10 KPa or more, the atmosphere is an inert gas, and the pressing state is maintained for 2 minutes or more. The holding temperature is preferably set to be equal to or higher than the solidus temperature of the brazing sheet 4 and lower than the solidus temperatures of the first metal member 2 and the second metal member 3. In the present embodiment, the brazing sheet 4 has a solidus temperature of 560 ° C., and the first metal member 2 and the second metal member 3 are made of wrought 3003 alloy (solidus temperature: 643 ° C.). It is desirable to set the holding temperature at the time of attachment heating to 560 ° C to less than 643 ° C. As the inert gas, for example, nitrogen, argon, and helium can be used. As the nitrogen gas, it is desirable to use industrial nitrogen gas whose oxygen concentration is regulated to 10 ppm or less.

これにより、第一金属部材２と第二金属部材３とが面ろう付けされる。ブレージングシート４は、本実施形態では単層のものを使用しているため、コストを低減することができる。また、面ろう付け工程では、不活性ガス雰囲気下で、フラックスを用いることなく面ろう付けを行っている。これにより、面ろう付け工程では、面接触させた状態で特定の面圧を付与してブレージングシート４を溶解させるとともに、アルミニウム合金部材（第一金属部材２及び第二金属部材３）同士の界面を濡らしつつ、溶融したろう材を界面から積極的に排出することができる。   Thereby, the first metal member 2 and the second metal member 3 are surface brazed. Since the brazing sheet 4 is a single-layer brazing sheet in this embodiment, the cost can be reduced. In the surface brazing step, the surface brazing is performed without using a flux in an inert gas atmosphere. Thereby, in the surface brazing step, a specific surface pressure is applied in a state where the surfaces are in contact with each other to melt the brazing sheet 4 and the interface between the aluminum alloy members (the first metal member 2 and the second metal member 3). , And the molten brazing material can be actively discharged from the interface.

図３に示すように、面ろう付け工程によって、溶融されたろう材Ｑは中央部から外側に排出され、凹溝１４，２４内に貯留される。つまり、凹溝１４，２４によって、流出されたろう材を貯留するろう材溜り部が形成される。   As shown in FIG. 3, by the surface brazing process, the molten brazing material Q is discharged outward from the central portion and stored in the concave grooves 14 and 24. In other words, the recesses 14 and 24 form a brazing material reservoir for storing the brazing material that has flowed out.

摩擦攪拌工程は、図４に示すように、接合用回転ツールＦを用いて重合部Ｊ１に対して全周囲に亘って摩擦攪拌接合を行う工程である。接合用回転ツールＦは、特許請求の範囲の「回転ツール」に相当する。   As shown in FIG. 4, the friction stir process is a process of performing friction stir welding over the entire circumference of the overlapping portion J1 using the rotating tool F for welding. The joining rotary tool F corresponds to a “rotating tool” in the claims.

接合用回転ツールＦは、連結部Ｆ１と、攪拌ピンＦ２とで構成されており、例えば工具鋼で形成されている。連結部Ｆ１は、図示しない摩擦攪拌装置に取り付けられる部位であって、円柱状を呈する。攪拌ピンＦ２は、連結部Ｆ１から垂下しており、連結部Ｆ１と同軸になっている。攪拌ピンＦ２は連結部Ｆ１から離間するにつれて先細りになっている。攪拌ピンＦ２の外周面には螺旋溝が刻設されている。本実施形態では、接合用回転ツールＦを右回転させるため、螺旋溝は、基端から先端に向かうにつれて左回りに形成されている。   The joining rotary tool F includes a connecting portion F1 and a stirring pin F2, and is made of, for example, tool steel. The connecting portion F1 is a portion to be attached to a friction stirrer (not shown), and has a columnar shape. The stirring pin F2 hangs down from the connecting portion F1 and is coaxial with the connecting portion F1. The stirring pin F2 tapers as it moves away from the connecting portion F1. A spiral groove is engraved on the outer peripheral surface of the stirring pin F2. In this embodiment, in order to rotate the joining rotary tool F clockwise, the spiral groove is formed counterclockwise from the base end toward the tip.

なお、接合用回転ツールＦを左回転させる場合は、螺旋溝を基端から先端に向かうにつれて右回りに形成することが好ましい。螺旋溝をこのように設定することで、摩擦攪拌の際に塑性流動化した金属が螺旋溝によって攪拌ピンＦ２の先端側に導かれる。これにより、被接合金属部材（第一金属部材２、第二金属部材３）の外部に溢れ出る金属の量を少なくすることができる。   In addition, when rotating the joining rotary tool F counterclockwise, it is preferable to form the spiral groove clockwise from the base end toward the tip end. By setting the spiral groove in this way, the metal plastically fluidized at the time of friction stirring is guided to the tip side of the stirring pin F2 by the spiral groove. Thereby, the amount of metal that overflows to the outside of the metal members to be joined (the first metal member 2 and the second metal member 3) can be reduced.

摩擦攪拌工程では、右回転させた接合用回転ツールＦを第一金属部材２の側面１２及び第二金属部材３の側面２２から垂直となるように挿入し、重合部Ｊ１に沿って相対移動させる。摩擦攪拌工程では、連結部Ｆ１を被接合金属部材から離間させて、攪拌ピンＦ２の基端側は露出した状態で摩擦攪拌を行う。本実施形態では、先端にスピンドルユニット等の回転駆動手段を備えたロボットアームに接合用回転ツールＦを取り付けることが好ましい。これにより、接合用回転ツールＦの回転中心軸を容易に傾斜させることができる。   In the friction stir process, the joining rotating tool F rotated right is inserted vertically from the side surface 12 of the first metal member 2 and the side surface 22 of the second metal member 3 and relatively moved along the overlapping portion J1. . In the friction stir step, the connection portion F1 is separated from the metal member to be joined, and friction stir is performed with the base end side of the stirring pin F2 exposed. In the present embodiment, it is preferable to attach the joining rotary tool F to a robot arm provided with a rotary drive unit such as a spindle unit at the tip. Thus, the rotation center axis of the joining rotary tool F can be easily inclined.

接合用回転ツールＦの移動方向はどちらでもよいが、本実施形態では、被接合金属部材を上から見て左回りとなるように設定する。図５に示すように、攪拌ピンＦ２は第一金属部材２及び第二金属部材３の両方に接触させる。接合用回転ツールＦの移動軌跡には塑性化領域Ｗ１が形成される。摩擦攪拌工程では、塑性化領域Ｗ１の始端と終端とが重なるようにすることが好ましい。   The moving direction of the joining rotary tool F may be either direction, but in the present embodiment, the joining metal member is set to be counterclockwise when viewed from above. As shown in FIG. 5, the stirring pin F2 is brought into contact with both the first metal member 2 and the second metal member 3. A plasticizing region W1 is formed on the movement trajectory of the joining rotary tool F. In the friction stir step, it is preferable that the beginning and the end of the plasticizing region W1 overlap.

以上説明した接合方法によれば、第一金属部材２と第二金属部材３の中央部は面ろう付けで接合されるとともに、外周縁は摩擦攪拌接合されるため、接合強度を高めることができる。ここで、一般的に、面ろう付けを行うと、溶融したろう材が重合部から外部に漏れ出るおそれがある。しかし、本実施形態では、凹溝１４，２４によってろう材溜り部を設けたため、溶融したろう材が第一金属部材２及び第二金属部材３の外部に漏れ出るのを防ぐことができる。   According to the joining method described above, since the central portions of the first metal member 2 and the second metal member 3 are joined by surface brazing, and the outer peripheral edges are joined by friction stir welding, the joining strength can be increased. . Here, in general, when the surface brazing is performed, there is a possibility that the molten brazing material leaks from the overlapping portion to the outside. However, in the present embodiment, since the brazing material pool is provided by the concave grooves 14 and 24, it is possible to prevent the molten brazing material from leaking out of the first metal member 2 and the second metal member 3.

また、摩擦攪拌工程では、接合用回転ツールＦの攪拌ピンＦ２のみを被接合金属部材に接触させるようにしたため、摩擦攪拌装置にかかる負担を軽減することができる。   Further, in the friction stir step, only the stirring pin F2 of the welding rotary tool F is brought into contact with the metal member to be joined, so that the load on the friction stir device can be reduced.

なお、本実施形態では前記のような形態としたが、他の形態であってもよい。例えば、回転ツールは、ショルダ部と、ショルダ部の下端面から突出する攪拌ピンとで構成されたものを用いてもよい。摩擦攪拌工程の際には、当該回転ツールのショルダ部を被接合金属部材に押し込んだ状態で摩擦攪拌接合を行ってもよい。また、摩擦攪拌工程では、攪拌ピンＦ２が、凹溝１４，２４に達するように挿入深さ及び凹溝１４，２４の位置を設定してもよい。これにより、凹溝１４，２４の隙間を金属で充填することができるため、構造体１の内部に空隙が発生するのを防ぐことができる。また、この際は、塑性化領域Ｗ１にろう材Ｑが巻き込まれないように、攪拌ピンＦ２がろう材Ｑに直接接触しない程度に挿入深さを設定することが好ましい。   In the present embodiment, the configuration is as described above, but another configuration may be used. For example, the rotating tool may be configured by a shoulder portion and a stirring pin protruding from a lower end surface of the shoulder portion. In the friction stir process, the friction stir welding may be performed in a state where the shoulder portion of the rotary tool is pressed into the metal member to be welded. In the friction stirring process, the insertion depth and the positions of the grooves 14 and 24 may be set so that the stirring pin F2 reaches the grooves 14 and 24. Thereby, the gap between the concave grooves 14 and 24 can be filled with the metal, so that it is possible to prevent the occurrence of a gap inside the structure 1. In this case, it is preferable to set the insertion depth so that the stirring pin F2 does not directly contact the brazing material Q so that the brazing material Q is not involved in the plasticizing region W1.

［第二実施形態］
次に、本発明の第二実施形態に係る接合方法ついて説明する。第二実施形態に係る接合方法では、準備工程と、凹溝形成工程と、重ね合わせ工程と、面ろう付け工程と、摩擦攪拌工程と、を行う。第二実施形態では、第一実施形態と相違する部分を中心に説明する。[Second embodiment]
Next, a joining method according to a second embodiment of the present invention will be described. In the joining method according to the second embodiment, a preparation step, a groove forming step, an overlapping step, a surface brazing step, and a friction stir step are performed. In the second embodiment, a description will be given focusing on portions different from the first embodiment.

準備工程では、図６に示すように、第一実施形態よりも薄い第一金属部材２及び第二金属部材３を用意する。凹溝形成工程、重ね合わせ工程及び面ろう付け工程は、第一実施形態と同等である。   In the preparation step, as shown in FIG. 6, a first metal member 2 and a second metal member 3 that are thinner than in the first embodiment are prepared. The groove forming step, the overlapping step, and the surface brazing step are the same as in the first embodiment.

摩擦攪拌工程は、図６及び図７に示すように、接合用回転ツールＦを用いて重合部Ｊ１に対して全周囲に亘って摩擦攪拌接合を行う工程である。摩擦攪拌工程では、第二金属部材３の表面２１に設定した開始位置Ｓｐに、表面２１に対して垂直に右回転させた接合用回転ツールＦを挿入し、第二金属部材３の表面２１において外周縁に沿って接合用回転ツールＦを一周させて相対移動させる。摩擦攪拌工程では、塑性化領域Ｗ１の始端と終端が重複するようにする。また、本実施形態では、凹溝１４，２４よりも外側に接合用回転ツールＦの移動ルートを設定している。   As shown in FIGS. 6 and 7, the friction stir process is a process of performing friction stir welding over the entire periphery of the overlapping portion J1 using the rotating tool F for welding. In the friction stir step, the joining rotating tool F rotated clockwise to the right perpendicular to the surface 21 is inserted into the start position Sp set on the surface 21 of the second metal member 3, and The joining rotary tool F is caused to make a complete rotation along the outer peripheral edge and relatively moved. In the friction stir process, the start and end of the plasticizing region W1 are made to overlap. In the present embodiment, the movement route of the joining rotary tool F is set outside the concave grooves 14 and 24.

摩擦攪拌工程では、攪拌ピンＦ２が第一金属部材２及び第二金属部材３の両方に接触するように挿入深さを設定する。なお、摩擦攪拌工程では、攪拌ピンＦ２が第二金属部材３のみと接触するように挿入深さを設定してもよい。この場合は、攪拌ピンＦ２と第二金属部材３との摩擦熱により重合部Ｊ１が塑性流動化して接合される。   In the friction stir process, the insertion depth is set such that the stirring pin F2 contacts both the first metal member 2 and the second metal member 3. In the friction stir step, the insertion depth may be set such that the stirring pin F2 contacts only the second metal member 3. In this case, the overlapping portion J1 is plastically fluidized by friction heat between the stirring pin F2 and the second metal member 3, and is joined.

以上説明した第二実施形態によっても第一実施形態と略同等の効果を得ることができる。なお、第二実施形態に係る接合方法では、塑性化領域Ｗ１を境にして塑性化領域Ｗ１よりも外側を切除してもよい。この際、塑性化領域Ｗ１に形成された窪みを境にすれば、容易に切除することができる。当該窪みは、摩擦攪拌工程によって塑性化領域Ｗ１の表面がより深くえぐれる部位である。またこの際、摩擦攪拌工程では、塑性化領域Ｗ１の外側にバリが形成（集約）されるように接合条件を設定することが好ましい。接合条件とは、接合用回転ツールＦの回転速度、回転方向、進行方向、移動速度（送り速度）、攪拌ピンＦ２の傾斜角度（テーパー角度）、被接合金属部材（第一金属部材２、第二金属部材３）の材質、被接合金属部材の厚さ等の各要素とこれらの要素の組合せで決定される。接合条件に応じて、バリが発生する側又はバリが多く発生する側が塑性化領域Ｗ１の外側となるように設定すれば、バリごと切除することができる。   According to the second embodiment described above, substantially the same effects as those of the first embodiment can be obtained. In the joining method according to the second embodiment, the outside of the plasticized region W1 may be cut off at the boundary of the plasticized region W1. At this time, the cut can be easily performed by using the depression formed in the plasticized region W1 as a boundary. The depression is a portion where the surface of the plasticized region W1 is deepened by the friction stir process. At this time, in the friction stir step, it is preferable to set the joining conditions so that burrs are formed (aggregated) outside the plasticized region W1. The welding conditions include the rotation speed, rotation direction, traveling direction, moving speed (feed speed), inclination angle (taper angle) of the stirring pin F2, the metal member to be welded (first metal member 2, It is determined by each element such as the material of the bimetallic member 3), the thickness of the metal member to be joined, and the combination of these elements. If the side where burrs are generated or the side where many burrs are generated is set outside the plasticized region W1 according to the joining conditions, the burrs can be cut together.

［第三実施形態］
次に、本発明の第三実施形態に係る接合方法について説明する。第三実施形態に係る接合方法では、準備工程と、凹溝形成工程と、重ね合わせ工程と、面ろう付け工程と、摩擦攪拌工程と、を行う。図８に示すように、第三実施形態では、第一金属部材２Ａと第二金属部材３Ａとの大きさが異なる点で第一実施形態と相違する。第三実施形態では、第一実施形態と相違する部分を中心に説明する。[Third embodiment]
Next, a joining method according to a third embodiment of the present invention will be described. In the bonding method according to the third embodiment, a preparation step, a groove forming step, an overlapping step, a surface brazing step, and a friction stir step are performed. As shown in FIG. 8, the third embodiment is different from the first embodiment in that the size of the first metal member 2A and the size of the second metal member 3A are different. In the third embodiment, a description will be given mainly of a portion different from the first embodiment.

準備工程では、第一金属部材２Ａ及び第二金属部材３Ａを用意する。第一金属部材２Ａ及び第二金属部材３Ａは、直方体を呈する。第一金属部材２Ａは、第二金属部材３Ａよりも大きくなっている。   In the preparation step, a first metal member 2A and a second metal member 3A are prepared. The first metal member 2A and the second metal member 3A have a rectangular parallelepiped shape. The first metal member 2A is larger than the second metal member 3A.

凹溝形成工程では、第一金属部材２Ａの表面１３に凹溝１４を形成する。凹溝１４は、第一金属部材２Ａの外周縁に沿って枠状に形成する。なお、第三実施形態では、第二金属部材３Ａには凹溝を形成しない。   In the groove forming step, a groove 14 is formed on the surface 13 of the first metal member 2A. The concave groove 14 is formed in a frame shape along the outer peripheral edge of the first metal member 2A. In the third embodiment, no groove is formed in the second metal member 3A.

重ね合わせ工程では、図９に示すように、間に単層ブレージングシート４を挟みつつ、第一金属部材２Ａの表面１３と、第二金属部材３Ａの裏面２３とを重ね合わせて重合部Ｊ２を形成する。ブレージングシート４は、凹溝１４の内側に配置される大きさになっている。   In the superposing step, as shown in FIG. 9, the superimposed portion J2 is formed by superposing the front surface 13 of the first metal member 2A and the rear surface 23 of the second metal member 3A while sandwiching the single-layer brazing sheet 4 therebetween. Form. The brazing sheet 4 is sized to be arranged inside the concave groove 14.

面ろう付け工程では、図１０に示すように、第一金属部材２及び第二金属部材３が近接する方向に、所定の条件下で押圧力を付与して面ろう付けを行う。面ろう付け工程によって、溶融されたろう材Ｑは中央部から外側に排出され、凹溝１４内に貯留される。つまり、凹溝１４及び第二金属部材３Ａの裏面２３によって、流出されたろう材を貯留するろう材溜り部が形成される。   In the surface brazing step, as shown in FIG. 10, surface brazing is performed by applying a pressing force in a direction in which the first metal member 2 and the second metal member 3 approach each other under a predetermined condition. By the surface brazing process, the molten brazing material Q is discharged from the central portion to the outside, and is stored in the concave groove 14. In other words, the recess 14 and the back surface 23 of the second metal member 3A form a brazing material reservoir for storing the brazing material that has flowed out.

摩擦攪拌工程では、図１１に示すように、第一金属部材２Ａと第二金属部材３Ａの内隅において接合用回転ツールＦを相対移動させて、重合部Ｊ２を摩擦攪拌接合する。本実施形態では、先端にスピンドルユニット等の回転駆動手段を備えたロボットアームに接合用回転ツールＦを取り付けることが好ましい。これにより、接合用回転ツールＦの回転中心軸の傾斜角度を容易に変更することができる。摩擦攪拌工程では、まず、第一金属部材２Ａの表面１３に設定した開始位置Ｓｐに接合用回転ツールＦの攪拌ピンＦ２を挿入し、第二金属部材３Ａ側に相対移動させる。そして、図１２に示すように、接合用回転ツールＦの回転中心軸を外側に傾斜させて、第一金属部材２Ａの表面１３と第二金属部材３Ａの側面２２とで構成された内隅に沿って相対移動させる。   In the friction stir process, as shown in FIG. 11, the joining rotary tool F is relatively moved at the inner corners of the first metal member 2A and the second metal member 3A to friction stir weld the overlapped portion J2. In the present embodiment, it is preferable to attach the joining rotary tool F to a robot arm provided with a rotary drive unit such as a spindle unit at the tip. Thereby, the inclination angle of the rotation center axis of the joining rotary tool F can be easily changed. In the friction stir process, first, the stirring pin F2 of the joining rotary tool F is inserted into the start position Sp set on the surface 13 of the first metal member 2A, and relatively moved toward the second metal member 3A. Then, as shown in FIG. 12, the rotation center axis of the joining rotary tool F is inclined outward, so that the rotation center axis is located at the inner corner formed by the surface 13 of the first metal member 2A and the side surface 22 of the second metal member 3A. Relative movement along.

接合用回転ツールＦの移動方向は、本実施形態では、上から見て左回りになっている。接合用回転ツールＦは、第二金属部材３Ａの周囲に一周させつつ、内隅上の始端と終端とを重複させた後、第一金属部材２Ａの表面１３に設定された終了位置で接合用回転ツールＦを離脱させる。これにより、構造体１Ａが形成される。   In the present embodiment, the moving direction of the joining rotary tool F is counterclockwise when viewed from above. The joining rotary tool F makes a round around the second metal member 3A and overlaps the start and end on the inner corner, and then joins at the end position set on the surface 13 of the first metal member 2A. Release the rotating tool F. Thereby, the structure 1A is formed.

以上説明した第三実施形態に係る接合方法によっても、第一実施形態と略同等の効果を奏することができる。また、本実施形態のように、第一金属部材２Ａと第二金属部材３Ａとの大きさが異なる場合、つまり、重ね合わされる面の大きさが異なる場合であっても、好適に接合することができる。また、第三実施形態によっても、凹溝１４にろう材Ｑを貯留することができるため、ろう材Ｑが外部に漏れ出るのを防ぐことができる。   With the bonding method according to the third embodiment described above, substantially the same effects as in the first embodiment can be achieved. Also, as in the present embodiment, when the size of the first metal member 2A and the size of the second metal member 3A are different, that is, even when the sizes of the surfaces to be overlapped are different, it is preferable to perform the joining. Can be. Also, according to the third embodiment, the brazing material Q can be stored in the concave groove 14, so that the brazing material Q can be prevented from leaking to the outside.

以上本発明の実施形態について説明したが、本発明の趣旨に反しない範囲において適宜設計変更が可能である。例えば、第一金属部材２，２Ａ及び第二金属部材３，３Ａは、直方体としたが、他の角形状や円柱状であってもよい。凹溝は省略してもよい。   Although the embodiments of the present invention have been described above, design changes can be made as appropriate without departing from the spirit of the present invention. For example, the first metal members 2 and 2A and the second metal members 3 and 3A are cuboids, but may be other square shapes or columnar shapes. The concave groove may be omitted.

［第四実施形態］
本発明の第四実施形態について図面を参照して詳細に説明する。図１３に示すように、第四実施形態に係る接合方法では、第一金属部材１０２と、第二金属部材１０３とを接合して、構造体１０１を形成する場合を例示する。本実施形態に係る接合方法では、準備工程と、重ね合わせ工程と、拡散接合工程と、摩擦攪拌工程と、を行う。[Fourth embodiment]
A fourth embodiment of the present invention will be described in detail with reference to the drawings. As illustrated in FIG. 13, the joining method according to the fourth embodiment exemplifies a case in which a first metal member 102 and a second metal member 103 are joined to form a structure 101. In the bonding method according to the present embodiment, a preparation step, an overlapping step, a diffusion bonding step, and a friction stir step are performed.

準備工程は、第一金属部材１０２及び第二金属部材１０３を用意する工程である。第一金属部材１０２は、略直方体を呈する金属部材である。第一金属部材１０２は、アルミニウム合金製である。第一金属部材１０２の４つの角部には丸面取り加工が施された面取り部が形成されている。第二金属部材１０３は、第一金属部材１０２と同等の形状及び材料になっている。   The preparation step is a step of preparing the first metal member 102 and the second metal member 103. The first metal member 102 is a metal member having a substantially rectangular parallelepiped shape. The first metal member 102 is made of an aluminum alloy. The four corners of the first metal member 102 are formed with round chamfers. The second metal member 103 has the same shape and material as the first metal member 102.

被接合金属部材である第一金属部材１０２及び第二金属部材１０３は、アルミニウム合金製であれば、展伸材（例えば、ＪＩＳ Ａ６０００系アルミニウム合金）であっても、鋳物であってもよい。つまり、被接合金属材にＳｉが含まれていれば、含まれるＳｉの含有量が１％以下であっても、銅合金箔又は銅箔による接合は可能である。ただし、このアルミニウム合金には、少なくとも、Ｍｇが０．１質量％以上含まれていることが必要である。このアルミニウム合金にＭｇが０．１質量％以上含まれていると、拡散接合工程では、アルミニウム合金部材の表面においてＭｇが優先的に酸化されて、アルミニウムの酸化を防止することができ、銅合金箔１０４と第一金属部材１０２との界面および銅合金箔１０４と第二金属部材１０３との界面において、銅とアルミニウムとの相互拡散を円滑に進めることができる。これにより、第一金属部材１０２と第二金属部材１０３とを強固に接合することができる。   As long as the first metal member 102 and the second metal member 103, which are the metal members to be joined, are made of an aluminum alloy, they may be wrought materials (for example, JIS A6000-based aluminum alloy) or castings. That is, as long as the metal material to be bonded contains Si, bonding with a copper alloy foil or a copper foil is possible even if the content of Si is 1% or less. However, this aluminum alloy needs to contain at least 0.1% by mass of Mg. If Mg is contained in the aluminum alloy in an amount of 0.1% by mass or more, Mg is preferentially oxidized on the surface of the aluminum alloy member in the diffusion bonding step, so that oxidation of aluminum can be prevented. At the interface between the foil 104 and the first metal member 102 and at the interface between the copper alloy foil 104 and the second metal member 103, mutual diffusion of copper and aluminum can be promoted smoothly. Thereby, the first metal member 102 and the second metal member 103 can be firmly joined.

重ね合わせ工程は、図１４に示すように、第一金属部材１０２及び第二金属部材１０３の重ね合わせ面同士を重ね合わせて重合部Ｊ１１を形成する際に、重ね合わせ面同士の間に銅合金箔１０４を挟み込む工程である。本実施形態では、銅合金箔１０４は、例えば、無酸素銅（ＪＩＳ Ｃ−１０２０）製の銅箔を使用した。銅合金箔１０４は、例えば、Ｃｕ−Ｚｎ合金製、Ｃｕ−Ｓｎ合金製の銅合金箔であってもよい。銅合金箔１０４は、薄い単層シートであり、第一金属部材１０２及び第二金属部材１０３の重ね合わせ面の内側に配置される大きさで形成されている。銅合金箔１０４の厚さは、薄ければ薄いほどよいが、本実施形態では、例えば、約２〜５０μｍである。銅合金箔１０４に代えて、銅箔を用いてもよい。   As shown in FIG. 14, when the overlapping surfaces of the first metal member 102 and the second metal member 103 are overlapped to form the overlapped portion J11, a copper alloy is formed between the overlapping surfaces. This is a step of sandwiching the foil 104. In the present embodiment, for example, a copper foil made of oxygen-free copper (JIS C-1020) is used as the copper alloy foil 104. The copper alloy foil 104 may be, for example, a copper alloy foil made of a Cu—Zn alloy or a Cu—Sn alloy. The copper alloy foil 104 is a thin single-layer sheet, and is formed to have a size that is arranged inside the overlapping surface of the first metal member 102 and the second metal member 103. The thickness of the copper alloy foil 104 is preferably as thin as possible, but is, for example, about 2 to 50 μm in the present embodiment. A copper foil may be used instead of the copper alloy foil 104.

重ね合わせ工程では、第一金属部材１０２と第二金属部材１０３との間に銅合金箔１０４を挟みつつ、第一金属部材１０２の表面（重ね合わせ面）１１３と、第二金属部材１０３の裏面（重ね合わせ面）１２３とを重ね合わせる。これにより、重合部Ｊ１１が形成される。   In the overlapping step, the surface (overlapping surface) 113 of the first metal member 102 and the back surface of the second metal member 103 are sandwiched between the first metal member 102 and the second metal member 103 with the copper alloy foil 104 interposed therebetween. (Overlapping surface) 123 is superimposed. Thereby, the overlapping portion J11 is formed.

拡散接合工程は、図１５に示すように、拡散接合を行う工程である。アルミニウム合金からなる第一金属部材１０２及び第二金属部材１０３に含有されるＭｇは、自らが酸化されることにより、還元剤として作用するため、アルミニウムの酸化を抑制する元素であると考えられる。アルミニウムの酸化が抑制されると、銅合金箔１０４と第一金属部材１０２との界面および銅合金箔１０４と第二金属部材１０３との界面におけるアルミニウムと銅との相互拡散を円滑に進めることができる。Ｍｇ有量が、０.１質量％に満たないと、加熱温度や保持時間にもよるが、その効果が不十分となり、十分な接合強度（せん断応力）が得られない可能性がある。したがって、アルミニウム合金部材中のＭｇ含有量は、０.１質量％以上の範囲とする。   The diffusion bonding step is a step of performing diffusion bonding as shown in FIG. Mg contained in the first metal member 102 and the second metal member 103 made of an aluminum alloy is considered to be an element that suppresses the oxidation of aluminum because it acts as a reducing agent by being oxidized by itself. When the oxidation of aluminum is suppressed, mutual diffusion of aluminum and copper at the interface between the copper alloy foil 104 and the first metal member 102 and the interface between the copper alloy foil 104 and the second metal member 103 can be smoothly promoted. it can. If the Mg content is less than 0.1% by mass, the effect is insufficient, depending on the heating temperature and the holding time, but there is a possibility that sufficient joining strength (shear stress) cannot be obtained. Therefore, the Mg content in the aluminum alloy member is set to a range of 0.1% by mass or more.

拡散接合工程では、第一金属部材１０２及び第二金属部材１０３が近接する方向に、所定の条件下で押圧力を付与して拡散接合を行う。拡散接合工程の条件は、第一金属部材１０２、第二金属部材１０３及び銅合金箔１０４の合金組成等によって適宜設定すればよい。本実施形態では、例えば、押圧力を約０．１〜１０ＭＰａ、不活性ガス雰囲気とし、押圧状態を２分以上保持する。保持温度は、５１０℃以上に設定する必要がある。保持温度は、５２０℃以上に設定することが好ましく、５２５℃以上に設定することがさらに好ましい。本実施形態では、銅合金箔１０４を、無酸素銅（ＪＩＳ Ｃ−１０２０）とし、第一金属部材１０２及び第二金属部材１０３を展伸材のＪＩＳ Ａ６０６３合金としているので、拡散接合工程での保持温度を、例えば、５２５〜５５０℃に設定することができる。不活性ガスは、例えば、窒素、アルゴン、ヘリウムを用いることができる。また、窒素ガスとしては、酸素濃度：１０ｐｐｍ以下に規制された工業用窒素ガスを用いることが望ましい。   In the diffusion bonding process, a pressing force is applied under a predetermined condition in a direction in which the first metal member 102 and the second metal member 103 approach to perform diffusion bonding. The conditions of the diffusion bonding step may be appropriately set depending on the alloy composition of the first metal member 102, the second metal member 103, and the copper alloy foil 104, and the like. In the present embodiment, for example, the pressing force is set to about 0.1 to 10 MPa, the atmosphere is an inert gas, and the pressing state is maintained for 2 minutes or more. The holding temperature needs to be set to 510 ° C. or higher. The holding temperature is preferably set to 520 ° C. or higher, more preferably 525 ° C. or higher. In the present embodiment, the copper alloy foil 104 is made of oxygen-free copper (JIS C-1020), and the first metal member 102 and the second metal member 103 are made of wrought JIS A6063 alloy. The holding temperature can be set to, for example, 525 to 550 ° C. As the inert gas, for example, nitrogen, argon, and helium can be used. As the nitrogen gas, it is desirable to use industrial nitrogen gas whose oxygen concentration is regulated to 10 ppm or less.

これにより、第一金属部材１０２と第二金属部材１０３とが拡散接合される。拡散接合工程における保持温度を比較的低温の５１０℃に設定する場合、第一金属部材１０２と銅合金箔１０４との界面及び第二金属部材１０３と銅合金箔１０４との界面において、アルミニウムと銅との相互拡散が進行する。銅合金箔１０４中にＡｌが拡散することで、第一金属部材１０２及び第二金属部材１０３の間に金属間化合物層１０５が生成する。この金属間化合物はＡｌ２Ｃｕ化合物であると考えられる。保持温度を比較的高温の５２５℃に設定する場合、第一金属部材１０２と金属間化合物層１０５との界面及び第二金属部材１０３と金属間化合物層１０５との界面において、アルミニウムと銅との相互拡散が起こり、金属間化合物層１０５の体積が時間経過とともに減少し、第一金属部材１０２及び第二金属部材１０３の接合部には複数の分散した粒子状の金属間化合物（Ａｌ２Ｃｕ）が残される。Thereby, the first metal member 102 and the second metal member 103 are diffusion-bonded. When the holding temperature in the diffusion bonding step is set to a relatively low temperature of 510 ° C., aluminum and copper are present at the interface between the first metal member 102 and the copper alloy foil 104 and at the interface between the second metal member 103 and the copper alloy foil 104. And mutual diffusion progresses. The diffusion of Al into the copper alloy foil 104 forms an intermetallic compound layer 105 between the first metal member 102 and the second metal member 103. This intermetallic compound is considered to be an Al 2 Cu compound. When the holding temperature is set to 525 ° C., which is relatively high, at the interface between the first metal member 102 and the intermetallic compound layer 105 and at the interface between the second metal member 103 and the intermetallic compound layer 105, Interdiffusion occurs, the volume of the intermetallic compound layer 105 decreases with time, and a plurality of dispersed particulate intermetallic compounds (Al 2 Cu) are formed at the joint between the first metal member 102 and the second metal member 103. Is left.

銅箔又は銅合金箔１０４は、本実施形態では単層のものを使用しているため、コストを低減することができる。また、拡散接合工程では、不活性ガス雰囲気下で、拡散接合を行っている。これにより、拡散接合工程では、面接触させた状態で特定の面圧を付与して拡散接合を行うとともに、アルミニウム合金部材（第一金属部材１０２及び第二金属部材１０３）同士の界面をＡｌ−Ｃｕ−Ｓｉ融液によって濡らしつつ、溶融したＡｌ−Ｃｕ−Ｓｉを界面から積極的に排出することができる。   In the present embodiment, a single-layer copper foil or copper alloy foil 104 is used, so that the cost can be reduced. In the diffusion bonding step, diffusion bonding is performed in an inert gas atmosphere. Thereby, in the diffusion bonding step, diffusion bonding is performed by applying a specific surface pressure in a state of surface contact, and the interface between the aluminum alloy members (the first metal member 102 and the second metal member 103) is formed by Al- The molten Al-Cu-Si can be positively discharged from the interface while being wetted by the Cu-Si melt.

摩擦攪拌工程は、図１６に示すように、接合用回転ツールＦを用いて重合部Ｊ１１に対して全周囲に亘って摩擦攪拌接合を行う工程である。   As shown in FIG. 16, the friction stir process is a process of performing friction stir welding over the entire periphery of the overlapping portion J11 using the rotating tool F for welding.

摩擦攪拌工程では、右回転させた接合用回転ツールＦを第一金属部材１０２の側面１１２及び第二金属部材１０３の側面１２２から垂直となるように挿入し、重合部Ｊ１１に沿って相対移動させる。接合用回転ツールＦの挿入深さは適宜設定すればよいが、本実施形態では攪拌ピンＦ２が金属間化合物層１０５に接触しない程度に設定している。摩擦攪拌工程では、連結部Ｆ１を被接合金属部材から離間させて、攪拌ピンＦ２の基端側は露出した状態で摩擦攪拌を行う。本実施形態では、先端にスピンドルユニット等の回転駆動手段を備えたロボットアームに接合用回転ツールＦを取り付けることが好ましい。これにより、接合用回転ツールＦの回転中心軸を容易に傾斜させることができる。   In the friction stir process, the joining rotating tool F rotated right is inserted vertically from the side surface 112 of the first metal member 102 and the side surface 122 of the second metal member 103, and relatively moved along the overlapping portion J11. . The insertion depth of the joining rotary tool F may be set as appropriate, but in the present embodiment, it is set so that the stirring pin F2 does not contact the intermetallic compound layer 105. In the friction stir step, the connection portion F1 is separated from the metal member to be joined, and friction stir is performed with the base end side of the stirring pin F2 exposed. In the present embodiment, it is preferable to attach the joining rotary tool F to a robot arm provided with a rotary drive unit such as a spindle unit at the tip. Thus, the rotation center axis of the joining rotary tool F can be easily inclined.

接合用回転ツールＦの移動方向はどちらでもよいが、本実施形態では、被接合金属部材を上から見て左回りとなるように設定する。図１７に示すように、攪拌ピンＦ２は第一金属部材１０２及び第二金属部材１０３の両方に接触させる。接合用回転ツールＦの移動軌跡には塑性化領域Ｗ１が形成される。摩擦攪拌工程では、接合用回転ツールＦを一周させて、塑性化領域Ｗ１の始端と終端とが重なるようにすることが好ましい。   The moving direction of the joining rotary tool F may be either direction, but in the present embodiment, the joining metal member is set to be counterclockwise when viewed from above. As shown in FIG. 17, the stirring pin F2 is brought into contact with both the first metal member 102 and the second metal member 103. A plasticizing region W1 is formed on the movement trajectory of the joining rotary tool F. In the friction stir step, it is preferable that the joining rotating tool F is caused to make one round so that the starting end and the end of the plasticizing region W1 overlap.

以上説明した接合方法によれば、第一金属部材１０２と第二金属部材１０３の中央部は拡散接合されるとともに、外周縁は摩擦攪拌接合されるため、接合強度を高めることができる。また、摩擦攪拌工程では、接合用回転ツールＦの攪拌ピンＦ２のみを被接合金属部材に接触させるようにしたため、摩擦攪拌装置にかかる負担を軽減することができる。   According to the joining method described above, the central portions of the first metal member 102 and the second metal member 103 are diffusion-bonded, and the outer peripheral edges are friction-stir-welded, so that the joining strength can be increased. Further, in the friction stir step, only the stirring pin F2 of the welding rotary tool F is brought into contact with the metal member to be joined, so that the load on the friction stir device can be reduced.

なお、本実施形態では前記のような形態としたが、他の形態であってもよい。例えば、回転ツールは、ショルダ部と、ショルダ部の下端面から突出する攪拌ピンとで構成されたものを用いてもよい。摩擦攪拌工程の際には、当該回転ツールのショルダ部を被接合金属部材に押し込んだ状態で摩擦攪拌接合を行ってもよい。   In the present embodiment, the configuration is as described above, but another configuration may be used. For example, the rotating tool may be configured by a shoulder portion and a stirring pin protruding from a lower end surface of the shoulder portion. In the friction stir process, the friction stir welding may be performed in a state where the shoulder portion of the rotary tool is pressed into the metal member to be welded.

［第五実施形態］
次に、本発明の第五実施形態に係る接合方法ついて説明する。第五実施形態に係る接合方法では、準備工程と、重ね合わせ工程と、拡散接合工程と、摩擦攪拌工程と、を行う。第五実施形態では、第四実施形態と相違する部分を中心に説明する。[Fifth embodiment]
Next, a joining method according to a fifth embodiment of the present invention will be described. In the bonding method according to the fifth embodiment, a preparation step, an overlapping step, a diffusion bonding step, and a friction stir step are performed. In the fifth embodiment, a description will be given focusing on portions different from the fourth embodiment.

準備工程では、図１８に示すように、第四実施形態よりも薄い第一金属部材１０２及び第二金属部材１０３を用意する。重ね合わせ工程及び拡散接合工程は、第四実施形態と同等である。   In the preparation step, as shown in FIG. 18, a first metal member 102 and a second metal member 103 that are thinner than in the fourth embodiment are prepared. The overlapping step and the diffusion bonding step are the same as in the fourth embodiment.

摩擦攪拌工程は、図１８及び図１９に示すように、接合用回転ツールＦを用いて重合部Ｊ１１に対して全周囲に亘って摩擦攪拌接合を行う工程である。摩擦攪拌工程では、第二金属部材１０３の表面１２１に設定した開始位置Ｓｐに、表面１２１に対して右回転させた接合用回転ツールＦを表面１２１に対して垂直に挿入し、第二金属部材１０３の表面１２１において外周縁に沿って接合用回転ツールＦを相対移動させる。摩擦攪拌工程では、塑性化領域Ｗ１の始端と終端が重複するようにする。   As shown in FIGS. 18 and 19, the friction stir welding step is a step of performing friction stir welding over the entire circumference of the overlapping portion J11 using the joining rotary tool F. In the friction stir step, a joining rotating tool F rotated clockwise with respect to the surface 121 is inserted perpendicularly to the surface 121 at a start position Sp set on the surface 121 of the second metal member 103. The rotation tool F for joining is relatively moved along the outer peripheral edge on the surface 121 of 103. In the friction stir process, the start and end of the plasticizing region W1 are made to overlap.

摩擦攪拌工程では、攪拌ピンＦ２が第一金属部材１０２及び第二金属部材１０３の両方に接触するように挿入深さを設定する。なお、摩擦攪拌工程では、攪拌ピンＦ２が第二金属部材１０３のみと接触するように挿入深さを設定してもよい。この場合は、攪拌ピンＦ１０２と第二金属部材１０３との摩擦熱により重合部Ｊ１１が塑性流動化して接合される。   In the friction stir process, the insertion depth is set so that the stirring pin F2 contacts both the first metal member 102 and the second metal member 103. In the friction stir process, the insertion depth may be set so that the stirring pin F2 contacts only the second metal member 103. In this case, the overlapping portion J11 plastically fluidizes due to frictional heat between the stirring pin F102 and the second metal member 103 and is joined.

以上説明した第五実施形態によっても第四実施形態と略同等の効果を得ることができる。なお、第五実施形態に係る接合方法では、塑性化領域Ｗ１を境にして塑性化領域Ｗ１よりも外側を切除してもよい。この際、塑性化領域Ｗ１に形成された窪みを境にすれば、容易に切除することができる。当該窪みは、摩擦攪拌工程によって塑性化領域Ｗ１の表面がより深くえぐれる部位である。またこの際、摩擦攪拌工程では、塑性化領域Ｗ１の外側にバリが形成されるように接合条件を設定することが好ましい。接合条件とは、接合用回転ツールＦの回転速度、回転方向、進行方向、移動速度（送り速度）、攪拌ピンＦ２の傾斜角度（テーパー角度）、被接合金属部材（第一金属部材１０２、第二金属部材１０３）の材質、被接合金属部材の厚さ等の各要素とこれらの要素の組合せで決定される。接合条件に応じて、バリが発生する側又はバリが多く発生する側が塑性化領域Ｗ１の外側となるように設定すれば、バリごと端部を切除することができる。   According to the fifth embodiment described above, substantially the same effects as those of the fourth embodiment can be obtained. In the joining method according to the fifth embodiment, the outside of the plasticized region W1 may be cut off at the boundary of the plasticized region W1. At this time, the cut can be easily performed by using the depression formed in the plasticized region W1 as a boundary. The depression is a portion where the surface of the plasticized region W1 is deepened by the friction stir process. At this time, in the friction stir step, it is preferable to set the joining conditions so that burrs are formed outside the plasticized region W1. The welding conditions include the rotation speed, rotation direction, traveling direction, moving speed (feed speed), inclination angle (taper angle) of the stirring pin F2, the metal member to be welded (the first metal member 102, It is determined by each element such as the material of the bimetal member 103), the thickness of the metal member to be joined, and the combination of these elements. If the side on which burrs are generated or the side on which burrs are generated is set so as to be outside the plasticized region W1 according to the joining conditions, the end portions can be cut off together with the burrs.

［第六実施形態］
次に、本発明の第六実施形態に係る接合方法について説明する。第六実施形態に係る接合方法では、準備工程と、重ね合わせ工程と、拡散接合工程と、摩擦攪拌工程と、を行う。図２０に示すように、第六実施形態では、第一金属部材１０２Ａと第二金属部材１０３Ａとの大きさが異なる点で第四実施形態と相違する。第六実施形態では、第四実施形態と相違する部分を中心に説明する。[Sixth embodiment]
Next, a joining method according to a sixth embodiment of the present invention will be described. In the bonding method according to the sixth embodiment, a preparation step, an overlapping step, a diffusion bonding step, and a friction stir step are performed. As shown in FIG. 20, the sixth embodiment differs from the fourth embodiment in that the sizes of the first metal member 102A and the second metal member 103A are different. In the sixth embodiment, a description will be given focusing on portions different from the fourth embodiment.

準備工程では、第一金属部材１０２Ａ及び第二金属部材１０３Ａを用意する。第一金属部材１０２Ａ及び第二金属部材１０３Ａは、直方体を呈する。第一金属部材１０２Ａは、第二金属部材１０３Ａよりも大きくなっている。   In the preparation step, a first metal member 102A and a second metal member 103A are prepared. The first metal member 102A and the second metal member 103A have a rectangular parallelepiped shape. The first metal member 102A is larger than the second metal member 103A.

重ね合わせ工程では、図２１に示すように、第一金属部材１０２Ａの表面１１３と第二金属部材１０３Ａの裏面１２３と間に銅合金箔１０４を挟みつつ、第一金属部材１０２Ａの表面１１３と、第二金属部材１０３Ａの裏面１２３とを重ね合わせて重合部Ｊ１２を形成する。銅合金箔１０４は、第二金属部材１０３Ａの裏面１２３の内側に配置される大きさになっている。   In the superimposing step, as shown in FIG. 21, while sandwiching the copper alloy foil 104 between the front surface 113 of the first metal member 102A and the back surface 123 of the second metal member 103A, The overlapping portion J12 is formed by overlapping the back surface 123 of the second metal member 103A. The copper alloy foil 104 has a size arranged inside the back surface 123 of the second metal member 103A.

拡散接合工程では、図２２に示すように、第一金属部材１０２Ａ及び第二金属部材１０３Ａが近接する方向に、所定の条件下で押圧力を付与して拡散接合を行う。   In the diffusion bonding step, as shown in FIG. 22, diffusion bonding is performed by applying a pressing force under a predetermined condition in a direction in which the first metal member 102A and the second metal member 103A approach each other.

摩擦攪拌工程では、図２３に示すように、第一金属部材１０２Ａと第二金属部材１０３Ａの内隅において接合用回転ツールＦを相対移動させて、重合部Ｊ１２を摩擦攪拌接合する。本実施形態では、先端にスピンドルユニット等の回転駆動手段を備えたロボットアームに接合用回転ツールＦを取り付けることが好ましい。これにより、接合用回転ツールＦの回転中心軸の傾斜角度を容易に変更することができる。摩擦攪拌工程では、まず、第一金属部材１０２Ａの表面１１３に設定した開始位置Ｓｐに接合用回転ツールＦの攪拌ピンＦ２を挿入し、第二金属部材１０３Ａ側に相対移動させる。そして、図２４に示すように、接合用回転ツールＦの回転中心軸を外側に傾斜させて、第一金属部材１０２Ａの表面１１３と第二金属部材１０３Ａの側面１２２とで構成された内隅に沿って相対移動させる。   In the friction stir process, as shown in FIG. 23, the joining rotary tool F is relatively moved at the inner corners of the first metal member 102A and the second metal member 103A to friction stir weld the overlapped portion J12. In the present embodiment, it is preferable to attach the joining rotary tool F to a robot arm provided with a rotary drive unit such as a spindle unit at the tip. Thereby, the inclination angle of the rotation center axis of the joining rotary tool F can be easily changed. In the friction stirring step, first, the stirring pin F2 of the joining rotary tool F is inserted into the start position Sp set on the surface 113 of the first metal member 102A, and relatively moved toward the second metal member 103A. Then, as shown in FIG. 24, the rotation center axis of the joining rotary tool F is inclined outward to form an inner corner formed by the surface 113 of the first metal member 102A and the side surface 122 of the second metal member 103A. Relative movement along.

接合用回転ツールＦの移動方向は、本実施形態では、上から見て左回りになっている。接合用回転ツールＦは、第二金属部材１０３Ａの周囲に一周させつつ、内隅上の始端と終端とを重複させた後、第一金属部材１０２Ａの表面１１３に設定された終了位置で接合用回転ツールＦを離脱させる。これにより、構造体１０１Ａが形成される。   In the present embodiment, the moving direction of the joining rotary tool F is counterclockwise when viewed from above. The rotating tool F for joining, while making a round around the second metal member 103A and overlapping the start and end on the inner corner, joins at the end position set on the surface 113 of the first metal member 102A. Release the rotating tool F. As a result, a structure 101A is formed.

以上説明した第六実施形態に係る接合方法によっても、第四実施形態と略同等の効果を奏することができる。また、本実施形態のように、第一金属部材１０２Ａと第二金属部材１０３Ａとの大きさが異なる場合、つまり、重ね合わされる面の大きさが異なる場合であっても、好適に接合することができる。   With the joining method according to the sixth embodiment described above, substantially the same effects as in the fourth embodiment can be achieved. Also, as in the present embodiment, when the size of the first metal member 102A and the size of the second metal member 103A are different, that is, even when the size of the surfaces to be overlapped is different, it is preferable to perform the joining. Can be.

１ 構造体
２ 第一金属部材
３ 第二金属部材
４ ブレージングシート
Ｊ１ 重合部
Ｗ１ 塑性化領域DESCRIPTION OF SYMBOLS 1 Structure 2 First metal member 3 Second metal member 4 Brazing sheet J1 Overlapping part W1 Plasticizing region

Claims (18)

アルミニウム合金製の第一金属部材及び第二金属部材を用意する準備工程と、
前記第一金属部材及び前記第二金属部材の重ね合わせ面同士を重ね合わせて重合部を形成する際に、前記重ね合わせ面同士の間にＡｌ−Ｓｉ−Ｍｇ系の単層ブレージングシートを挟み込む重ね合わせ工程と、
前記重ね合わせ工程後、前記第一金属部材及び前記第二金属部材を押圧しながら前記単層ブレージングシートの固相線温度以上に加熱して、前記第一金属部材と前記第二金属部材とを面ろう付けする面ろう付け工程と、
前記面ろう付け工程後、回転ツールの攪拌ピンを前記第一金属部材及び前記第二金属部材の側面から挿入し、前記攪拌ピンを前記第一金属部材及び前記第二金属部材の両方に接触させつつの全周に亘って前記重合部を摩擦攪拌する摩擦攪拌工程と、を含むことを特徴とする接合方法。A preparation step of preparing a first metal member and a second metal member made of an aluminum alloy,
When the superposed surfaces of the first metal member and the second metal member are superimposed to form an overlapped portion, an Al-Si-Mg-based single-layer brazing sheet is sandwiched between the superposed surfaces. Matching process,
After the overlapping step, the first metal member and the second metal member are heated to a solidus temperature or higher of the single-layer brazing sheet while pressing the second metal member, and the first metal member and the second metal member are heated. A surface brazing process for surface brazing;
After the surface brazing step, a stirring pin of a rotating tool is inserted from a side surface of the first metal member and the second metal member, and the stirring pin is brought into contact with both the first metal member and the second metal member. A friction stir step of friction-stirring the overlapped portion over one entire circumference. 前記重ね合わせ工程の前に、前記第一金属部材の重ね合わせ面及び前記第二金属部材の重ね合わせ面の少なくともいずれかの周縁部に沿って凹溝を設ける凹溝形成工程を含み、
前記重ね合わせ工程では、前記重ね合わせ面のうち前記凹溝の内側に前記単層ブレージングシートを挟み込むことを特徴とする請求項１に記載の接合方法。Before the superimposing step, the method includes a groove forming step of providing a groove along at least one peripheral edge of the superposed surface of the first metal member and the superposed surface of the second metal member,
2. The bonding method according to claim 1, wherein in the overlapping step, the single-layer brazing sheet is sandwiched inside the concave groove on the overlapping surface. 3. 前記摩擦攪拌工程では、前記回転ツールの前記攪拌ピンのみを前記第一金属部材及び前記第二金属部材の両方に接触させた状態で摩擦攪拌を行うことを特徴とする請求項１又は請求項２に記載の接合方法。   3. The friction stir step, wherein friction stir is performed in a state where only the stirring pin of the rotary tool is in contact with both the first metal member and the second metal member. 4. The joining method according to 1. アルミニウム合金製の第一金属部材及び第二金属部材を用意する準備工程と、
前記第一金属部材及び前記第二金属部材の重ね合わせ面同士を重ね合わせて重合部を形成する際に、前記重ね合わせ面同士の間にＡｌ−Ｓｉ−Ｍｇ系の単層ブレージングシートを挟み込む重ね合わせ工程と、
前記重ね合わせ工程後、前記第一金属部材及び前記第二金属部材を押圧しながら前記単層ブレージングシートの固相線温度以上に加熱して、前記第一金属部材及び前記第二金属部材を面ろう付けする面ろう付け工程と、
前記面ろう付け工程後、回転ツールの攪拌ピンを前記第二金属部材の表面から挿入し、前記攪拌ピンを前記第一金属部材及び前記第二金属部材の両方、又は、前記第二金属部材のみに接触させつつ全周に亘って前記重合部を摩擦攪拌する摩擦攪拌工程と、を含むことを特徴とする接合方法。A preparation step of preparing a first metal member and a second metal member made of an aluminum alloy,
When the superposed surfaces of the first metal member and the second metal member are superimposed to form an overlapped portion, an Al-Si-Mg-based single-layer brazing sheet is sandwiched between the superposed surfaces. Matching process,
After the superposition step, the first metal member and the second metal member are heated to a temperature equal to or higher than the solidus temperature of the single-layer brazing sheet while pressing the first metal member and the second metal member. Brazing surface brazing process,
After the surface brazing step, insert the stirring pin of the rotating tool from the surface of the second metal member, the stirring pin both the first metal member and the second metal member, or only the second metal member And a friction stir step of friction-stirring the overlapped portion over the entire circumference while contacting the superposed portion. 前記重ね合わせ工程の前に、前記第一金属部材の重ね合わせ面及び前記第二金属部材の重ね合わせ面の少なくともいずれかの周縁部に沿って凹溝を設ける凹溝形成工程を含み、
前記重ね合わせ工程では、前記重ね合わせ面のうち前記凹溝の内側に前記単層ブレージングシートを挟み込むことを特徴とする請求項４に記載の接合方法。Before the superimposing step, the method includes a groove forming step of providing a groove along at least one peripheral edge of the superposed surface of the first metal member and the superposed surface of the second metal member,
5. The bonding method according to claim 4, wherein in the overlapping step, the single-layer brazing sheet is sandwiched inside the concave groove on the overlapping surface. 前記摩擦攪拌工程では、前記回転ツールの前記攪拌ピンのみを前記第一金属部材及び前記第二金属部材の両方、又は、前記第二金属部材のみに接触させた状態で摩擦攪拌を行うことを特徴とする請求項４又は請求項５に記載の接合方法。   In the friction stir step, friction stirring is performed in a state where only the stirring pin of the rotary tool is in contact with both the first metal member and the second metal member, or only the second metal member. The joining method according to claim 4 or 5, wherein 前記摩擦攪拌工程では、前記凹溝よりも外側において前記回転ツールを相対移動させて摩擦攪拌を行うことを特徴とする請求項５に記載の接合方法。   The method according to claim 5, wherein, in the friction stir step, the rotary tool is relatively moved outside the concave groove to perform friction stir. 重ね合わされる重ね合わせ面の面積が異なるアルミニウム合金製の第一金属部材及び第二金属部材を用意する準備工程と、
前記第一金属部材及び前記第二金属部材の重ね合わせ面同士を重ね合わせて重合部を形成する際に、前記重ね合わせ面同士の間にＡｌ−Ｓｉ−Ｍｇ系の単層ブレージングシートを挟み込む重ね合わせ工程と、
前記重ね合わせ工程後、前記第一金属部材及び前記第二金属部材を押圧しながら前記単層ブレージングシートの固相線温度以上に加熱して、前記第一金属部材及び前記第二金属部材を面ろう付けする面ろう付け工程と、
前記面ろう付け工程後、回転ツールの攪拌ピンを前記第一金属部材と第二金属部材とで構成される内隅から挿入し、全周に亘って前記重合部を摩擦攪拌する摩擦攪拌工程と、を含むことを特徴とする接合方法。A preparation step of preparing a first metal member and a second metal member made of an aluminum alloy having different areas of a superimposed surface to be superimposed,
When the superposed surfaces of the first metal member and the second metal member are superimposed to form an overlapped portion, an Al-Si-Mg-based single-layer brazing sheet is sandwiched between the superposed surfaces. Matching process,
After the superposition step, the first metal member and the second metal member are heated to a temperature equal to or higher than the solidus temperature of the single-layer brazing sheet while pressing the first metal member and the second metal member. Brazing surface brazing process,
After the surface brazing step, a stir pin of a rotary tool is inserted from an inner corner formed by the first metal member and the second metal member, and a friction stir step of friction-stirring the overlapped portion over the entire circumference. And a joining method. 前記重ね合わせ工程の前に、前記第一金属部材の重ね合わせ面及び前記第二金属部材の重ね合わせ面の少なくともいずれかの周縁部に沿って凹溝を設ける凹溝形成工程を含み、
前記重ね合わせ工程では、前記重ね合わせ面のうち前記凹溝の内側に前記単層ブレージングシートを挟み込むことを特徴とする請求項８に記載の接合方法。Before the superimposing step, the method includes a groove forming step of providing a groove along at least one peripheral edge of the superposed surface of the first metal member and the superposed surface of the second metal member,
9. The bonding method according to claim 8, wherein in the overlapping step, the single-layer brazing sheet is sandwiched inside the concave groove in the overlapping surface. アルミニウム合金からなる第一金属部材及び第二金属部材を用意する準備工程と、
前記第一金属部材及び前記第二金属部材の重ね合わせ面同士を重ね合わせて重合部を形成する際に、前記重ね合わせ面同士の間に銅箔又は銅合金箔を挟み込む重ね合わせ工程と、
前記重ね合わせ工程後、前記第一金属部材及び前記第二金属部材を押圧しながら５１０℃以上に加熱して、前記第一金属部材と前記第二金属部材とを拡散接合する拡散接合工程と、
前記拡散接合工程後、回転ツールの攪拌ピンを前記第一金属部材及び前記第二金属部材の側面から挿入し、全周に亘って前記重合部を摩擦攪拌する摩擦攪拌工程と、を含むことを特徴とする接合方法。A preparation step of preparing a first metal member and a second metal member made of an aluminum alloy,
When forming a superposed portion by superimposing the superposed surfaces of the first metal member and the second metal member, a superposing step of sandwiching a copper foil or a copper alloy foil between the superposed surfaces,
After the superposing step, the first metal member and the second metal member are heated to 510 ° C. or more while being pressed, and a diffusion bonding step of diffusion bonding the first metal member and the second metal member is performed,
After the diffusion bonding step, a friction stir step of inserting a stirring pin of a rotary tool from a side surface of the first metal member and the second metal member and friction stir the overlapping portion over the entire circumference. Characteristic joining method. 前記重ね合わせ工程の前に、前記第一金属部材の重ね合わせ面及び前記第二金属部材の重ね合わせ面の少なくともいずれかの周縁部に沿って凹溝を設ける凹溝形成工程を含み、
前記重ね合わせ工程では、前記重ね合わせ面のうち前記凹溝の内側に前記銅箔又は前記銅合金箔を挟み込むことを特徴とする請求項１０に記載の接合方法。Before the superimposing step, the method includes a groove forming step of providing a groove along at least one peripheral edge of the superposed surface of the first metal member and the superposed surface of the second metal member,
The bonding method according to claim 10, wherein, in the overlapping step, the copper foil or the copper alloy foil is sandwiched inside the concave groove in the overlapping surface. 前記摩擦攪拌工程では、前記回転ツールの前記攪拌ピンのみを前記第一金属部材及び前記第二金属部材の両方に接触させた状態で摩擦攪拌を行うことを特徴とする請求項１０又は請求項１１に記載の接合方法。   12. The friction stir step in which friction stirring is performed in a state where only the stirring pin of the rotary tool is in contact with both the first metal member and the second metal member. 3. The joining method according to 1. アルミニウム合金からなる第一金属部材及び第二金属部材を用意する準備工程と、
前記第一金属部材及び前記第二金属部材の重ね合わせ面同士を重ね合わせて重合部を形成する際に、前記重ね合わせ面同士の間に銅箔又は銅合金箔を挟み込む重ね合わせ工程と、
前記重ね合わせ工程後、前記第一金属部材及び前記第二金属部材を押圧しながら５１０℃以上に加熱して、前記第一金属部材と前記第二金属部材とを拡散接合する拡散接合工程と、
前記拡散接合工程後、回転ツールの攪拌ピンを前記第二金属部材の表面から挿入し、前記攪拌ピンを前記第一金属部材及び前記第二金属部材の両方、又は、前記第二金属部材のみに接触させつつ全周に亘って前記重合部を摩擦攪拌する摩擦攪拌工程と、を含むことを特徴とする接合方法。A preparation step of preparing a first metal member and a second metal member made of an aluminum alloy,
When forming a superposed portion by superimposing the superposed surfaces of the first metal member and the second metal member, a superposing step of sandwiching a copper foil or a copper alloy foil between the superposed surfaces,
After the superposing step, the first metal member and the second metal member are heated to 510 ° C. or more while being pressed, and a diffusion bonding step of diffusion bonding the first metal member and the second metal member is performed,
After the diffusion bonding step, insert the stirring pin of the rotating tool from the surface of the second metal member, the stirring pin into both the first metal member and the second metal member, or only the second metal member A friction stir step of friction-stirring the overlapping portion over the entire circumference while making contact. 前記重ね合わせ工程の前に、前記第一金属部材の重ね合わせ面及び前記第二金属部材の重ね合わせ面の少なくともいずれかの周縁部に沿って凹溝を設ける凹溝形成工程を含み、
前記重ね合わせ工程では、前記重ね合わせ面のうち前記凹溝の内側に前記銅箔又は前記銅合金箔を挟み込むことを特徴とする請求項１３に記載の接合方法。Before the superimposing step, the method includes a groove forming step of providing a groove along at least one peripheral edge of the superposed surface of the first metal member and the superposed surface of the second metal member,
14. The bonding method according to claim 13, wherein, in the overlapping step, the copper foil or the copper alloy foil is sandwiched inside the concave groove in the overlapping surface. 前記摩擦攪拌工程では、前記回転ツールの前記攪拌ピンのみを前記第一金属部材及び前記第二金属部材の両方、又は、前記第二金属部材のみに接触させた状態で摩擦攪拌を行うことを特徴とする請求項１３又は請求項１４に記載の接合方法。   In the friction stir step, friction stirring is performed in a state where only the stirring pin of the rotating tool is in contact with both the first metal member and the second metal member, or only the second metal member. The bonding method according to claim 13 or 14, wherein 前記摩擦攪拌工程では、前記凹溝よりも外側において前記回転ツールを相対移動させて摩擦攪拌を行うことを特徴とする請求項１４に記載の接合方法。   The joining method according to claim 14, wherein, in the friction stir step, friction stir is performed by relatively moving the rotary tool outside the groove. 重ね合わされる重ね合わせ面の面積が異なるアルミニウム合金からなる第一金属部材及び第二金属部材を用意する準備工程と、
前記第一金属部材及び前記第二金属部材の重ね合わせ面同士を重ね合わせて重合部を形成する際に、前記重ね合わせ面同士の間に銅箔又は銅合金箔を挟み込む重ね合わせ工程と、
前記重ね合わせ工程後に、前記第一金属部材及び前記第二金属部材を押圧しながら５１０℃以上に加熱して、前記第一金属部材及び前記第二金属部材を拡散接合する拡散接合工程と、
前記拡散接合工程後、回転ツールの攪拌ピンを前記第一金属部材と第二金属部材とで構成される内隅から挿入し、全周に亘って前記重合部を摩擦攪拌する摩擦攪拌工程と、を含むことを特徴とする接合方法。A step of preparing a first metal member and a second metal member made of an aluminum alloy having different areas of the superimposed surfaces to be superimposed,
When forming a superposed portion by superimposing the superposed surfaces of the first metal member and the second metal member, a superposing step of sandwiching a copper foil or a copper alloy foil between the superposed surfaces,
After the superimposing step, the first metal member and the second metal member are heated to 510 ° C. or more while being pressed, and a diffusion bonding step of diffusion bonding the first metal member and the second metal member,
After the diffusion bonding step, a stirring pin of a rotating tool is inserted from an inner corner formed by the first metal member and the second metal member, and a friction stir step of friction-stirring the overlapped portion over the entire circumference, A joining method comprising: 前記重ね合わせ工程の前に、前記第一金属部材の重ね合わせ面及び前記第二金属部材の重ね合わせ面の少なくともいずれかの周縁部に沿って凹溝を設ける凹溝形成工程を含み、
前記重ね合わせ工程では、前記重ね合わせ面のうち前記凹溝の内側に前記銅箔又は前記銅合金箔を挟み込むことを特徴とする請求項１７に記載の接合方法。Before the superimposing step, the method includes a groove forming step of providing a groove along at least one peripheral edge of the superposed surface of the first metal member and the superposed surface of the second metal member,
The bonding method according to claim 17, wherein in the overlapping step, the copper foil or the copper alloy foil is sandwiched inside the concave groove in the overlapping surface.
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