JP6794703B2 - Joining method - Google Patents

Joining method Download PDF

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JP6794703B2
JP6794703B2 JP2016154145A JP2016154145A JP6794703B2 JP 6794703 B2 JP6794703 B2 JP 6794703B2 JP 2016154145 A JP2016154145 A JP 2016154145A JP 2016154145 A JP2016154145 A JP 2016154145A JP 6794703 B2 JP6794703 B2 JP 6794703B2
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metal member
auxiliary member
joining
auxiliary
metal
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JP2018020364A (en
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堀 久司
久司 堀
伸城 瀬尾
伸城 瀬尾
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Nippon Light Metal Co Ltd
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Nippon Light Metal Co Ltd
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Priority to JP2016154145A priority Critical patent/JP6794703B2/en
Priority to PCT/JP2017/001823 priority patent/WO2017138324A1/en
Priority to US16/076,301 priority patent/US20190039168A1/en
Priority to CN201780008920.XA priority patent/CN108698158A/en
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Description

本発明は、金属部材同士を摩擦攪拌で接合する接合方法に関する。 The present invention relates to a joining method for joining metal members by friction stir welding.

例えば、特許文献1には、第一金属部材と第二金属部材を重ね合わせて重合部を形成した後、第二金属部材の表面から回転ツールを挿入して重合部を摩擦攪拌接合する接合方法が記載されている。当該摩擦攪拌接合では、攪拌ピンのみを第二金属部材に接触させた状態で摩擦攪拌を行うというものである。 For example, Patent Document 1 describes a joining method in which a first metal member and a second metal member are superposed to form a polymerized portion, and then a rotating tool is inserted from the surface of the second metal member to friction stir weld the polymerized portions. Is described. In the friction stir welding, friction stir welding is performed with only the stirring pin in contact with the second metal member.

特開2015−139800号公報JP-A-2015-139800

従来の接合方法であると、塑性流動化した金属を回転ツールのショルダ部で押さえないため、塑性流動化した金属が外部に溢れ出し接合部が金属不足になり、第二金属部材の表面に凹溝が形成されるという問題がある。 In the conventional joining method, since the plastically fluidized metal is not pressed by the shoulder portion of the rotating tool, the plastically fluidized metal overflows to the outside, the joint portion becomes short of metal, and the surface of the second metal member is recessed. There is a problem that grooves are formed.

そこで、本発明は、接合部の金属不足を防ぐことができる接合方法を提供することを課題とする。 Therefore, an object of the present invention is to provide a joining method capable of preventing a metal shortage at the joining portion.

このような課題を解決するために本発明は、攪拌ピンを備えた回転ツールを用いて第一金属部材と第二金属部材とを接合する接合方法であって、少なくとも表面の高さが変化する前記第一金属部材の表面に、少なくとも裏面の高さが変化する前記第二金属部材の裏面を重ね合せて高さが変化する重合部を形成する重合工程と、前記第二金属部材の表面に面接触するように補助部材を配置する配置工程と、回転する前記攪拌ピンを前記補助部材の表面側から挿入し、前記回転ツールの前記攪拌ピンのみを前記第二金属部材及び前記補助部材、又は、前記第一金属部材、前記第二金属部材及び前記補助部材に接触させた状態で前記回転ツールを相対移動させて前記第一金属部材、前記第二金属部材及び前記補助部材を接合する摩擦攪拌工程と、バリが形成された前記補助部材を前記第二金属部材から除去する除去工程と、を含み、前記補助部材の端面を通り前記第一金属部材及び前記第二金属部材に直交する線を基準線とした場合、前記摩擦攪拌工程では、前記回転ツールの回転中心軸と前記基準線とが重なるように前記攪拌ピンを相対移動させるとともに、バリが前記補助部材に形成されるように接合条件を設定することを特徴とする。 In order to solve such a problem, the present invention is a joining method for joining a first metal member and a second metal member using a rotating tool equipped with a stirring pin, and at least the height of the surface changes. A polymerization step of superimposing the back surface of the second metal member whose height changes at least on the front surface of the first metal member to form a polymerized portion whose height changes, and on the surface of the second metal member. The arrangement step of arranging the auxiliary members so as to make surface contact, and the rotating stirring pin is inserted from the surface side of the auxiliary member, and only the stirring pin of the rotating tool is the second metal member and the auxiliary member, or , The rotating tool is relatively moved in contact with the first metal member, the second metal member, and the auxiliary member to join the first metal member, the second metal member, and the auxiliary member. A line including a step and a removing step of removing the auxiliary member on which burrs are formed from the second metal member, passing through the end face of the auxiliary member and orthogonal to the first metal member and the second metal member. When the reference line is used, in the friction stirring step, the stirring pin is relatively moved so that the rotation center axis of the rotation tool and the reference line overlap, and the joining condition is such that burrs are formed on the auxiliary member. and said that you set up.

かかる方法によれば、高さが変化する重合部が接合されるとともに、高さが変化する第一金属部材及び第二金属部材に加え、補助部材も同時に摩擦攪拌接合することにより、接合部の金属不足を防ぐことができる。これにより、第二金属部材の表面に凹溝ができるのを防ぐことができる。
また、バリを補助部材ごと除去することができる。
更に、回転ツールに対して片側にのみ補助部材が残存するため、除去工程を容易に行うことができる。
According to this method, the polymerized portion whose height changes is joined, and in addition to the first metal member and the second metal member whose height changes, the auxiliary member is also friction-stir welded at the same time to join the joined portion. It is possible to prevent metal shortage. This makes it possible to prevent the formation of concave grooves on the surface of the second metal member.
Moreover, the burr can be removed together with the auxiliary member.
Further, since the auxiliary member remains on only one side of the rotating tool, the removal step can be easily performed.

また、本発明は、攪拌ピンを備えた回転ツールを用いて第一金属部材と第二金属部材とを接合する接合方法であって、少なくとも表面の高さが変化する前記第一金属部材の表面に、少なくとも裏面の高さが変化する前記第二金属部材の裏面を重ね合せて高さが変化する重合部を形成する重合工程と、前記第二金属部材の表面に面接触するように補助部材を配置する配置工程と、回転する前記攪拌ピンを前記補助部材の表面側から挿入し、前記回転ツールの前記攪拌ピンのみを前記第二金属部材及び前記補助部材、又は、前記第一金属部材、前記第二金属部材及び前記補助部材に接触させた状態で前記回転ツールを相対移動させて前記第一金属部材、前記第二金属部材及び前記補助部材を接合する摩擦攪拌工程と、バリが形成された前記補助部材を前記第二金属部材から除去する除去工程と、を含み、前記補助部材の端面を通り前記第一金属部材及び前記第二金属部材に直交する線を基準線とした場合、前記摩擦攪拌工程では、前記摩擦攪拌工程を行った後に前記回転ツールの片側にのみ補助部材が残存する程度に前記回転ツールの回転中心軸を前記基準線よりもわずかに前記補助部材の中央側に偏移させて相対移動させるとともに、残存する前記補助部材にバリが形成されるように接合条件を設定することを特徴とする。 Further, the present invention is a joining method for joining a first metal member and a second metal member using a rotating tool provided with a stirring pin, and the surface of the first metal member whose surface height changes at least. In addition, at least a polymerization step of superimposing the back surfaces of the second metal member whose height changes on the back surface to form a polymerized portion whose height changes, and an auxiliary member so as to make surface contact with the front surface of the second metal member. The second metal member and the auxiliary member, or the first metal member, the rotating tool is inserted from the surface side of the auxiliary member, and only the stirring pin of the rotation tool is inserted. A burr is formed with a friction stirring step of joining the first metal member, the second metal member, and the auxiliary member by relatively moving the rotating tool in contact with the second metal member and the auxiliary member. When the line including the removal step of removing the auxiliary member from the second metal member and passing through the end face of the auxiliary member and orthogonal to the first metal member and the second metal member is used as a reference line. In the friction stirring step, the rotation center axis of the rotating tool is slightly biased toward the center side of the auxiliary member with respect to the reference line to the extent that the auxiliary member remains only on one side of the rotating tool after the friction stirring step is performed. It is characterized in that the joining conditions are set so that burrs are formed on the remaining auxiliary member while being moved and relatively moved.

かかる方法によれば、高さが変化する重合部が接合されるとともに、高さが変化する第一金属部材及び第二金属部材に加え、補助部材も同時に摩擦攪拌接合することにより、接合部の金属不足を防ぐことができる。これにより、第二金属部材の表面に凹溝ができるのを防ぐことができる。また、バリを補助部材ごと除去することができる。更に、回転ツールに対して方側にのみ補助部材が残存するため、除去工程を容易に行うことができる。また、回転ツールの回転中心軸が基準線よりも補助部材の中央側に偏移しているため接合部の金属不足をより確実に防ぐことができる。また、補助部材に回転ツールを容易に挿入することができる。 According to this method, the polymerized portion whose height changes is joined, and in addition to the first metal member and the second metal member whose height changes, the auxiliary member is also friction-stir welded at the same time to join the joined portion. It is possible to prevent metal shortage. This makes it possible to prevent the formation of concave grooves on the surface of the second metal member. In addition, burrs can be removed together with the auxiliary member. Further, since the auxiliary member remains only on the side with respect to the rotation tool, the removal step can be easily performed. Further, since the rotation center axis of the rotation tool is shifted to the center side of the auxiliary member from the reference line, it is possible to more reliably prevent the metal shortage of the joint portion. In addition, the rotation tool can be easily inserted into the auxiliary member.

本発明に係る接合方法によれば、接合部の金属不足を防ぐことができる。 According to the joining method according to the present invention, it is possible to prevent a metal shortage at the joint.

本発明の第一実施形態に係る接合方法の第一金属部材、第二金属部材及び補助部材を示す斜視図である。It is a perspective view which shows the 1st metal member, the 2nd metal member and the auxiliary member of the joining method which concerns on 1st Embodiment of this invention. 第一実施形態に係る接合方法の重合工程及び配置工程を示す断面図である。It is sectional drawing which shows the polymerization process and the arrangement process of the joining method which concerns on 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 which shows the friction stir step of the joining method which concerns on 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断面図である。It is sectional drawing which shows the friction stir step of the joining method which concerns on 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断面図である。It is sectional drawing which shows the friction stir step of the joining method which concerns on 1st Embodiment. 第一実施形態に係る接合方法の除去工程前を示す断面図である。It is sectional drawing which shows before the removal process of the joining method which concerns on 1st Embodiment. 第一実施形態に係る接合方法の除去工程を示す断面図である。It is sectional drawing which shows the removal process of the joining method which concerns on 1st Embodiment. 第一実施形態に係る接合方法の除去工程後を示す断面図である。It is sectional drawing which shows after the removal process of the joining method which concerns on 1st Embodiment. 第一実施形態に係る接合方法の摩擦攪拌工程(変形例)を示す断面図である。It is sectional drawing which shows the friction stir step (deformation example) of the joining method which concerns on 1st Embodiment. 本発明の第二実施形態の重合工程及び配置工程を示す断面図である。It is sectional drawing which shows the polymerization process and arrangement process of the 2nd Embodiment of this invention. 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 which shows the friction stir step of the joining method which concerns on 2nd Embodiment. 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 stir step of the joining method which concerns on 2nd Embodiment. 第二実施形態に係る接合方法の除去工程を示す断面図である。It is sectional drawing which shows the removal process of the joining method which concerns on 2nd Embodiment. 本発明の第三実施形態の重合工程及び配置工程を示す断面図である。It is sectional drawing which shows the polymerization process and arrangement process of the 3rd Embodiment of this invention. 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 which shows the friction stir step of the joining method which concerns on 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断面図である。It is sectional drawing which shows the friction stir step of the joining method which concerns on 3rd Embodiment. 第三実施形態に係る接合方法の除去工程を示す断面図である。It is sectional drawing which shows the removal process of the joining method which concerns on 3rd Embodiment. 他の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 which concerns on another embodiment.

[第一実施形態]
本発明の第一実施形態に係る接合方法について図面を参照して詳細に説明する。本実施形態に係る接合方法では、重合工程と、配置工程と、摩擦攪拌工程と、除去工程と、を行う。なお、以下の説明における「表面」とは、「裏面」の反対側の面という意味である。
[First Embodiment]
The joining method according to the first embodiment of the present invention will be described in detail with reference to the drawings. In the joining method according to the present embodiment, a polymerization step, a placement step, a friction stir step, and a removal step are performed. In the following description, the "front surface" means the surface opposite to the "back surface".

重合工程は、図1に示すように第一金属部材1と第二金属部材10とを重ね合わせる工程である第一金属部材1及び第二金属部材10は、金属製の板状部材である。第一金属部材1及び第二金属部材10の材料は、摩擦攪拌可能な金属であれば特に制限されないが、例えば、アルミニウム、アルミニウム合金、銅、銅合金、チタン、チタン合金、マグネシウム、マグネシウム合金等から適宜選択すればよい。第一金属部材1の板厚は、第二金属部材10の板厚よりも厚くなっている。 As shown in FIG. 1, the polymerization step is a step of superimposing the first metal member 1 and the second metal member 10, and the first metal member 1 and the second metal member 10 are metal plate-shaped members. The materials of the first metal member 1 and the second metal member 10 are not particularly limited as long as they are metals that can be agitated by friction. For example, aluminum, aluminum alloy, copper, copper alloy, titanium, titanium alloy, magnesium, magnesium alloy and the like. It may be selected appropriately from. The plate thickness of the first metal member 1 is thicker than the plate thickness of the second metal member 10.

第一金属部材1は、直方体を呈する本体部2と、本体部2の上に形成され断面台形状を呈する凸部3とで構成されている。凸部3の表面3aは、本体部2の表面2a,2bよりも上方に位置している。凸部3の第一表面3bは、傾斜しており本体部2の表面2aと凸部3の表面3aとを連結している。また、凸部3の第二表面3cは、傾斜しており本体部2の表面2bと凸部3の表面3aとを連結している。 The first metal member 1 is composed of a main body portion 2 having a rectangular parallelepiped shape and a convex portion 3 formed on the main body portion 2 and having a trapezoidal cross section. The surface 3a of the convex portion 3 is located above the surfaces 2a and 2b of the main body portion 2. The first surface 3b of the convex portion 3 is inclined and connects the surface 2a of the main body portion 2 and the surface 3a of the convex portion 3. Further, the second surface 3c of the convex portion 3 is inclined so as to connect the surface 2b of the main body portion 2 and the surface 3a of the convex portion 3.

第二金属部材10は、第一金属部材1よりも薄く、一定の板厚で形成された高さの異なる板状部材である。第二金属部材10は、基部11,11と、中央部12と、傾斜部13,14とで構成されている。中央部12は、基部11,11の中央において、基部11,11よりも高い位置に形成されている。傾斜部13は、一方の基部11と中央部12とを斜めに連結している。傾斜部14は、他方の基部11と中央部12とを斜めに連結している。 The second metal member 10 is thinner than the first metal member 1, and is a plate-shaped member having a constant plate thickness and different heights. The second metal member 10 is composed of base portions 11 and 11, central portions 12, and inclined portions 13 and 14. The central portion 12 is formed at a position higher than the bases 11 and 11 in the center of the bases 11 and 11. The inclined portion 13 obliquely connects one base portion 11 and the central portion 12. The inclined portion 14 obliquely connects the other base portion 11 and the central portion 12.

重合工程では、図2に示すように、第一金属部材1の表面に、第二金属部材10の裏面を重ね合わせて重合部J1を形成する。より詳しくは、本体部2の表面2a,2bと、基部11,11の裏面11b,11bとを重ね合わせるとともに、凸部3の表面3aと中央部12の裏面12bとを重ね合わせる。また、凸部3の第一表面3bと傾斜部13の裏面13bとを重ね合わせるとともに、凸部3の第二表面3cと傾斜部14の裏面14bとを重ね合わせる。 In the polymerization step, as shown in FIG. 2, the back surface of the second metal member 10 is superposed on the surface of the first metal member 1 to form the polymerization portion J1. More specifically, the front surfaces 2a and 2b of the main body 2 and the back surfaces 11b and 11b of the bases 11 and 11 are overlapped, and the front surface 3a of the convex portion 3 and the back surface 12b of the central portion 12 are overlapped. Further, the first surface 3b of the convex portion 3 and the back surface 13b of the inclined portion 13 are overlapped, and the second surface 3c of the convex portion 3 and the back surface 14b of the inclined portion 14 are overlapped.

第一金属部材1と第二金属部材10とはほぼ隙間なく重ね合わされる。重合部J1は、その高さ位置が変化するように形成される。つまり、重合部J1は、摩擦攪拌の始点(挿入位置)の高さ(標高)を基準高さとすると、始点から終点に至るまでに基準高さと高さの異なる区間が存在している。本実施形態では、重合部J1は、第一平部Jaと、第一傾斜部Jbと、第二平部Jcと、第二傾斜部Jdと、第三平部Jeとで構成されている。 The first metal member 1 and the second metal member 10 are overlapped with each other with almost no gap. The polymerization portion J1 is formed so that its height position changes. That is, assuming that the height (elevation) of the start point (insertion position) of friction stir welding is the reference height, the polymerization section J1 has sections having different reference heights and heights from the start point to the end point. In the present embodiment, the overlapping portion J1 is composed of a first flat portion Ja, a first inclined portion Jb, a second flat portion Jc, a second inclined portion Jd, and a third flat portion Je.

配置工程は、図1に示す第二金属部材10に補助部材20を配置する工程である。補助部材20は金属製の板状部材である。補助部材20は摩擦攪拌可能な金属であれば特に制限されないが、本実施形態では第一金属部材1及び第二金属部材10と同じ材料になっている。補助部材20の板厚は、後記する摩擦攪拌工程後の塑性化領域Wが金属不足にならないように適宜設定する。本実施形態では、補助部材20の板厚は第二金属部材10よりも薄く設定している。 The arranging step is a step of arranging the auxiliary member 20 on the second metal member 10 shown in FIG. The auxiliary member 20 is a metal plate-shaped member. The auxiliary member 20 is not particularly limited as long as it is a metal capable of friction stir welding, but in the present embodiment, it is made of the same material as the first metal member 1 and the second metal member 10. The plate thickness of the auxiliary member 20 is appropriately set so that the plasticized region W after the friction stir welding step described later does not run out of metal. In the present embodiment, the plate thickness of the auxiliary member 20 is set to be thinner than that of the second metal member 10.

補助部材20は、一定の板厚で形成された高さの異なる板状部材である。補助部材20は、基部21,21と、中央部22と、傾斜部23,24とで構成されている。中央部22は、基部21,21の中央において、基部21,21よりも高い位置に形成されている。傾斜部23は、一方の基部21と中央部22とを斜めに連結している。傾斜部24は、他方の基部21と中央部22とを斜めに連結している。また、基部21,21のそれぞれの端部の中央付近には、スリット25,25が設けられている。 The auxiliary member 20 is a plate-shaped member having a constant plate thickness and different heights. The auxiliary member 20 is composed of base portions 21 and 21, central portions 22, and inclined portions 23 and 24. The central portion 22 is formed at a position higher than the base portions 21 and 21 at the center of the base portions 21 and 21. The inclined portion 23 obliquely connects one base portion 21 and the central portion 22. The inclined portion 24 obliquely connects the other base portion 21 and the central portion 22. Further, slits 25 and 25 are provided near the center of each end of the bases 21 and 21.

配置工程では、図3に示すように、第二金属部材10の表面の長手方向の中央部に沿って、補助部材20の裏面を面接触させる。より詳しくは、図2に示すように、第二金属部材10の基部11,11の表面11a,11aと、補助部材20の基部21,21の裏面21b,21bとを重ね合わせるとともに、中央部12の表面12aと中央部22の裏面22bとを重ね合わせる。また、傾斜部13の第一表面13aと傾斜部23の裏面23bとを重ね合わせるとともに、傾斜部14の第二表面14aと傾斜部24の裏面24bとを重ね合わせる。 In the arranging step, as shown in FIG. 3, the back surface of the auxiliary member 20 is brought into surface contact along the central portion of the surface of the second metal member 10 in the longitudinal direction. More specifically, as shown in FIG. 2, the front surfaces 11a and 11a of the bases 11 and 11 of the second metal member 10 and the back surfaces 21b and 21b of the bases 21 and 21 of the auxiliary member 20 are overlapped and the central portion 12 is overlapped. The front surface 12a of the above and the back surface 22b of the central portion 22 are overlapped with each other. Further, the first surface 13a of the inclined portion 13 and the back surface 23b of the inclined portion 23 are overlapped, and the second surface 14a of the inclined portion 14 and the back surface 24b of the inclined portion 24 are overlapped.

また、第一金属部材1、第二金属部材10及び補助部材20を治具(図示省略)を用いて架台Tに移動不能に拘束する。なお、補助部材20は本実施形態では高さの異なる板状としているが、他の形状であってもよい。 Further, the first metal member 1, the second metal member 10, and the auxiliary member 20 are immovably restrained on the gantry T by using a jig (not shown). Although the auxiliary member 20 has a plate shape having a different height in the present embodiment, it may have another shape.

摩擦攪拌工程は、図3に示すように、接合用回転ツールFを用いて第一金属部材1と第二金属部材10との重合部J1を摩擦攪拌によって接合する工程である。接合用回転ツールFは、連結部F1と、攪拌ピンF2とで構成されている。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。接合用回転ツールFは、例えば工具鋼で形成されている。連結部F1は、摩擦攪拌装置の回転軸(図示省略)に連結される部位である。連結部F1は円柱状を呈している。 As shown in FIG. 3, the friction stir welding step is a step of joining the superposed portion J1 of the first metal member 1 and the second metal member 10 by friction stir welding using the joining rotary tool F. The joining rotary tool F is composed of a connecting portion F1 and a stirring pin F2. The rotary tool F for joining corresponds to the "rotation tool" in the claims. The rotary tool F for joining is made of, for example, tool steel. The connecting portion F1 is a portion connected to a rotating shaft (not shown) of the friction stirrer. The connecting portion F1 has a columnar shape.

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。言い換えると、螺旋溝は、螺旋溝を基端から先端に向けてなぞると上から見て左回りに形成されている。 The stirring pin F2 hangs down from the connecting portion F1 and is coaxial with the connecting portion F1. The stirring pin F2 is tapered as it is separated from the connecting portion F1. A spiral groove is engraved on the outer peripheral surface of the stirring pin F2. In the present embodiment, in order to rotate the joining rotation tool F clockwise, the spiral groove is formed counterclockwise from the base end to the tip end. In other words, the spiral groove is formed counterclockwise when viewed from above when the spiral groove is traced from the base end to the tip end.

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。言い換えると、この場合の螺旋溝は、螺旋溝を基端から先端に向けてなぞると上から見て右回りに形成されている。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1、第二金属部材10及び補助部材20)の外部に溢れ出る金属の量を少なくすることができる。 When the joint rotation tool F is rotated counterclockwise, it is preferable to form the spiral groove clockwise from the base end to the tip end. In other words, the spiral groove in this case is formed clockwise when viewed from above when the spiral groove is traced from the base end to the tip end. By setting the spiral groove in this way, the metal plastically fluidized during friction stir welding is guided to the tip end side of the stirring pin F2 by the spiral groove. As a result, the amount of metal that overflows to the outside of the metal member to be joined (first metal member 1, second metal member 10 and auxiliary member 20) can be reduced.

接合用回転ツールFは、マシニングセンタ等の摩擦攪拌装置に取り付けてもよいが、例えば、先端にスピンドルユニット等の回転手段を備えたアームロボットに取り付けてもよい。アームロボットに接合用回転ツールFを取り付けることにより接合用回転ツールFの回転中心軸Fcを容易に傾斜させることができる。 The joining rotary tool F may be attached to a friction stir device such as a machining center, or may be attached to, for example, an arm robot having a rotating means such as a spindle unit at the tip. By attaching the joining rotation tool F to the arm robot, the rotation center axis Fc of the joining rotation tool F can be easily tilted.

摩擦攪拌工程では、図3に示す補助部材20の表面に設定した開始位置Spに、右回転させた接合用回転ツールFの攪拌ピンF2を、図4に示すように重合部J1まで挿入する。この攪拌ピンF2の挿入深さは、本実施形態では、攪拌ピンF2が第一金属部材1に達するように設定している。また、接合用回転ツールFの回転中心軸が、常に鉛直軸と平行となる状態で摩擦攪拌を行う。なお、攪拌ピンF2を第二金属部材10及び補助部材20のみに接触させた状態で重合部J1を摩擦攪拌するようにしてもよい。この場合は、攪拌ピンF2と第二金属部材10及び補助部材20との摩擦熱によって重合部J1が塑性流動化して接合される。接合用回転ツールFの移動軌跡には、補助部材20に塑性化領域Wが形成される。 In the friction stir welding step, the stirring pin F2 of the joining rotation tool F rotated clockwise is inserted up to the polymerization portion J1 as shown in FIG. 4 at the start position Sp set on the surface of the auxiliary member 20 shown in FIG. In the present embodiment, the insertion depth of the stirring pin F2 is set so that the stirring pin F2 reaches the first metal member 1. Further, friction stirring is performed in a state where the rotation center axis of the joining rotation tool F is always parallel to the vertical axis. The polymerized portion J1 may be frictionally agitated with the stirring pin F2 in contact with only the second metal member 10 and the auxiliary member 20. In this case, the polymerized portion J1 is plastically fluidized and joined by the frictional heat between the stirring pin F2 and the second metal member 10 and the auxiliary member 20. A plasticized region W is formed in the auxiliary member 20 in the movement locus of the joining rotation tool F.

つまり、摩擦攪拌工程では、図4に示すように、重合部J1に対する攪拌ピンF2の挿入深さをほぼ一定に保ちつつ、攪拌ピンF2のみを補助部材20、第一金属部材1及び第二金属部材10に接触させた状態で摩擦攪拌を行う。本実施形態に係る摩擦攪拌工程では、補助部材20、第一金属部材1及び第二金属部材10が固定された架台(図示省略)に対して接合用回転ツールFを、補助部材20の上下に高さ(標高)が異なる表面を、上下動させることにより摩擦攪拌を行う。 That is, in the friction stir welding step, as shown in FIG. 4, while keeping the insertion depth of the stirring pin F2 into the overlapping portion J1 substantially constant, only the stirring pin F2 is used as the auxiliary member 20, the first metal member 1, and the second metal. Friction stir welding is performed in a state of being in contact with the member 10. In the friction stir welding step according to the present embodiment, the rotary tool F for joining is placed above and below the auxiliary member 20 on a pedestal (not shown) to which the auxiliary member 20, the first metal member 1 and the second metal member 10 are fixed. Friction stir welding is performed by moving surfaces with different heights (elevations) up and down.

これにより、第一平部Jaの塑性化領域Wの深さZa、第一傾斜部Jbの塑性化領域Wの深さZb(傾斜部23の表面23aと直交する線上における塑性化領域Wの深さ)及び第二平部Jcの塑性化領域Wの深さZcをほぼ同等にすることができる。攪拌ピンF2の「挿入深さ」とは、接合用回転ツールFの回転中心軸Fc上における補助部材20の表面から攪拌ピンF2の先端までの距離を意味する。 As a result, the depth Za of the plasticized region W of the first flat portion Ja and the depth Zb of the plasticized region W of the first inclined portion Jb (the depth of the plasticized region W on the line orthogonal to the surface 23a of the inclined portion 23). The depth Zc of the plasticized region W of the second flat portion Jc can be made substantially the same. The "insertion depth" of the stirring pin F2 means the distance from the surface of the auxiliary member 20 on the rotation center axis Fc of the joining rotation tool F to the tip of the stirring pin F2.

上記の摩擦攪拌工程によって攪拌ピンF2の周囲が摩擦攪拌され、第一金属部材1と第二金属部材10とが接合される。この際、図5及び図6に示すように、補助部材20の表面部にバリVが形成される。なお、本実施形態では、接合用回転ツールFを高速回転させているため、バリは後述するシアー側に比べてフロー側の方に多く発生する傾向にある。なお、攪拌ピンF2を第二金属部材10及び補助部材20のみに接触させて(第一金属部材1には達しないようにして)摩擦攪拌を行ってもよい。この場合は、攪拌ピンF2と第二金属部材10及び補助部材20との摩擦熱によって重合部J1が塑性流動化して接合される。 By the above friction stirring step, the periphery of the stirring pin F2 is frictionally stirred, and the first metal member 1 and the second metal member 10 are joined. At this time, as shown in FIGS. 5 and 6, burrs V are formed on the surface portion of the auxiliary member 20. In this embodiment, since the joining rotation tool F is rotated at high speed, burrs tend to occur more on the flow side than on the shear side, which will be described later. The stirring pin F2 may be brought into contact with only the second metal member 10 and the auxiliary member 20 (so as not to reach the first metal member 1) to perform friction stir welding. In this case, the polymerized portion J1 is plastically fluidized and joined by the frictional heat between the stirring pin F2 and the second metal member 10 and the auxiliary member 20.

除去工程は、図7及び図8に示すように、補助部材20を第二金属部材10から除去する工程である。除去工程では、例えば手作業により、補助部材20を第二金属部材10から離間する方向に両側から折り曲げて第二金属部材10から除去する。この際、補助部材20のスリット25,25(図3参照)の一方を起点として端部をめくり上げつつ、折り曲げるようにして除去する。 The removing step is a step of removing the auxiliary member 20 from the second metal member 10, as shown in FIGS. 7 and 8. In the removing step, for example, the auxiliary member 20 is manually bent from both sides in a direction away from the second metal member 10 and removed from the second metal member 10. At this time, the auxiliary member 20 is removed by bending it while turning up the end portion starting from one of the slits 25 and 25 (see FIG. 3).

以上説明した本実施形態に係る接合方法によれば、第一金属部材1と第二金属部材101とが接合されるとともに、第一金属部材1及び第二金属部材10に加え、補助部材20も同時に摩擦攪拌接合されることにより、接合部(塑性化領域W)の金属不足を防ぐことができる。これにより、第二金属部材10の表面に凹溝が形成されるのを防ぐことができる。 According to the joining method according to the present embodiment described above, the first metal member 1 and the second metal member 101 are joined, and in addition to the first metal member 1 and the second metal member 10, the auxiliary member 20 is also formed. By friction stir welding at the same time, it is possible to prevent metal shortage in the joint portion (plasticized region W). This makes it possible to prevent the formation of concave grooves on the surface of the second metal member 10.

また、補助部材20の中央部から攪拌ピンF2を挿入することにより、接合部の金属不足をより確実に防ぐことができるとともに、金属をバランスよく補充することができる。また、補助部材20の中央部から攪拌ピンF2を挿入することにより、攪拌ピンF2を補助部材20に容易に挿入することができる。 Further, by inserting the stirring pin F2 from the central portion of the auxiliary member 20, the metal shortage at the joint portion can be more reliably prevented, and the metal can be replenished in a well-balanced manner. Further, by inserting the stirring pin F2 from the central portion of the auxiliary member 20, the stirring pin F2 can be easily inserted into the auxiliary member 20.

また、本実施形態によれば、摩擦攪拌工程によって分断された補助部材20,20にそれぞれバリV,Vが形成されるが、除去工程において補助部材20,20ごと取り除くことができる。これにより、バリを除去する作業を容易に行うことができる。補助部材20は除去装置等を用いて除去してもよいが、本実施形態では手作業で補助部材20を容易に取り除くことができる。 Further, according to the present embodiment, burrs V and V are formed on the auxiliary members 20 and 20 separated by the friction stir welding step, respectively, but the auxiliary members 20 and 20 can be removed together in the removing step. As a result, the work of removing burrs can be easily performed. The auxiliary member 20 may be removed by using a removing device or the like, but in the present embodiment, the auxiliary member 20 can be easily removed manually.

ここで、本実施形態に係る接合方法では、補助部材20を第一金属部材1及び第二金属部材10よりも薄く設定しているため、従来のように回転ツールのショルダ部を金属部材に押し込みながら摩擦攪拌を行うと、ショルダ部と補助部材20との接触により補助部材20が外部に飛ばされてしまい接合部の金属不足を補うことができない。しかし、本実施形態では、接合用回転ツールFの攪拌ピンF2のみを第一金属部材1、第二金属部材10及び補助部材20に接触させつつ摩擦攪拌を行うため、補助部材20が外部に飛ばされることなく接合部の金属不足を補うことができる。また、本実施形態によれば、回転ツールのショルダ部を接触させる場合に比べて摩擦攪拌装置に作用する負荷を低減した状態で、深い位置にある重合部J1を接合することができる。 Here, in the joining method according to the present embodiment, since the auxiliary member 20 is set thinner than the first metal member 1 and the second metal member 10, the shoulder portion of the rotation tool is pushed into the metal member as in the conventional case. However, when frictional stirring is performed, the auxiliary member 20 is blown to the outside due to the contact between the shoulder portion and the auxiliary member 20, and the metal shortage at the joint portion cannot be compensated. However, in the present embodiment, since only the stirring pin F2 of the rotary tool F for joining is brought into contact with the first metal member 1, the second metal member 10 and the auxiliary member 20 for frictional stirring, the auxiliary member 20 is blown to the outside. It is possible to make up for the metal shortage at the joint without being damaged. Further, according to the present embodiment, the polymerization portion J1 at a deep position can be joined in a state where the load acting on the friction stir device is reduced as compared with the case where the shoulder portion of the rotary tool is brought into contact with the shoulder portion.

[変形例]
図9は、第一実施形態に係る接合方法の変形例の摩擦攪拌工程を示す断面図である。図9に示すように、変形例では、摩擦攪拌工程を行う際に、接合用回転ツールFを接合面に対して垂直に挿入しつつ摩擦攪拌を行う。変形例の摩擦攪拌工程では、第一平部Ja、第二平部Jc及び第三平部Jeにおいては、第一実施形態と同様に接合用回転ツールFの回転中心軸Fcを鉛直軸と平行にした状態で摩擦攪拌を行う。一方、第一傾斜部Jb及び第二傾斜部Jdにおいては、接合用回転ツールFを鉛直軸に対して傾斜させて、第一傾斜部Jb及び第二傾斜部Jdの接合面に対して接合用回転ツールFの回転中心軸Fcを垂直にした状態で摩擦攪拌を行う。
[Modification example]
FIG. 9 is a cross-sectional view showing a friction stir step of a modified example of the joining method according to the first embodiment. As shown in FIG. 9, in the modified example, when the friction stir step is performed, the friction stir is performed while the joint rotation tool F is inserted perpendicularly to the joint surface. In the friction stir welding step of the modified example, in the first flat portion Ja, the second flat portion Jc, and the third flat portion Je, the rotation center axis Fc of the joining rotation tool F is parallel to the vertical axis as in the first embodiment. Friction stir welding is performed in this state. On the other hand, in the first inclined portion Jb and the second inclined portion Jd, the rotating tool F for joining is tilted with respect to the vertical axis for joining with respect to the joining surface of the first inclined portion Jb and the second inclined portion Jd. Friction stirring is performed with the rotation center axis Fc of the rotation tool F vertical.

変形例を行う場合は、例えば、先端にスピンドルユニット等の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を取り付けて摩擦攪拌を行うことが好ましい。このような摩擦攪拌装置によれば、接合用回転ツールFの回転中心軸Fcの角度を容易に変更することができる。これにより、重合部J1の高さが変化する場合においても、摩擦攪拌中に鉛直軸に対する接合用回転ツールFの回転中心軸Fcの角度を変更することで、接合面に対して接合用回転ツールFを常に垂直にした状態で連続して摩擦攪拌を行うことができる。 When performing a modification, for example, it is preferable to attach the joining rotary tool F to a robot arm having a driving means such as a spindle unit at the tip to perform friction stir welding. According to such a friction stirrer, the angle of the rotation center axis Fc of the joining rotation tool F can be easily changed. As a result, even when the height of the overlapping portion J1 changes, by changing the angle of the rotation center axis Fc of the joining rotation tool F with respect to the vertical axis during friction stir welding, the joining rotation tool with respect to the joining surface Friction stir welding can be continuously performed with F always vertical.

前記した変形例であっても、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、接合用回転ツールFを各接合面に対して垂直に挿入することができるため、傾斜面であっても重合部J1の深い位置まで摩擦攪拌を行うことができる。 Even in the above-described modification, the same effect as that of the first embodiment can be obtained. Further, since the rotary tool F for joining can be inserted perpendicularly to each joining surface, friction stirring can be performed to a deep position of the polymerization portion J1 even on an inclined surface.

[第二実施形態]
次に、第二実施形態に係る接合方法について説明する。第二実施形態に係る接合方法は、図10に示す補助部材20Aの端面20aから接合用回転ツールFを挿入する点で第一実施形態と相違する。また、補助部材20Aには、スリット25,25が形成されていない点が相違する。第二実施形態に係る接合方法では、第一実施形態と相違する部分を中心に説明する。
[Second Embodiment]
Next, the joining method according to the second embodiment will be described. The joining method according to the second embodiment is different from the first embodiment in that the rotary tool F for joining is inserted from the end face 20a of the auxiliary member 20A shown in FIG. Further, the auxiliary member 20A is different in that the slits 25 and 25 are not formed. In the joining method according to the second embodiment, the parts different from the first embodiment will be mainly described.

本実施形態に係る接合方法は、重合工程と、配置工程と、摩擦攪拌工程と、除去工程とを行う。重合工程は、第一実施形態と同じであるため説明を省略する。配置工程では、図10及び図11に示すように、第一実施形態と同じ要領で第二金属部材10の表面に補助部材20Aを配置する。第二実施形態の補助部材20Aは、第一実施形態の補助部材20の半分程度の幅になっている。 The joining method according to the present embodiment includes a polymerization step, an arrangement step, a friction stir step, and a removal step. Since the polymerization step is the same as that of the first embodiment, the description thereof will be omitted. In the arranging step, as shown in FIGS. 10 and 11, the auxiliary member 20A is arranged on the surface of the second metal member 10 in the same manner as in the first embodiment. The auxiliary member 20A of the second embodiment has a width of about half that of the auxiliary member 20 of the first embodiment.

摩擦攪拌工程は、図11及び図12に示すように、接合用回転ツールFを用いて第一金属部材1と第二金属部材10との重合部J1を摩擦攪拌によって接合する工程である。本実施形態では、接合用回転ツールFを左回転させるため、攪拌ピンF2の螺旋溝は、基端から先端に向かうにつれて右回りに形成されている。言い換えると、螺旋溝は、螺旋溝を基端から先端に向けてなぞると上から見て右回りに形成されている。 As shown in FIGS. 11 and 12, the friction stir welding step is a step of joining the superposed portion J1 of the first metal member 1 and the second metal member 10 by friction stir welding using the joining rotary tool F. In the present embodiment, in order to rotate the joining rotation tool F counterclockwise, the spiral groove of the stirring pin F2 is formed clockwise from the base end to the tip end. In other words, the spiral groove is formed clockwise when viewed from above when the spiral groove is traced from the base end to the tip end.

摩擦攪拌工程では、左回転させた攪拌ピンF2のみを挿入し、被接合金属部材と連結部F1とは離間させつつ相対移動させる。言い換えると、攪拌ピンF2の基端部は露出させた状態で摩擦攪拌接合を行う。ここで、図10に示すように、補助部材20Aの端面20aを通り第一金属部材1及び第二金属部材10に直交する線を基準線Zとする。摩擦攪拌工程では、図11に示すように、接合用回転ツールFの回転中心軸Fcを基準線Zに重ねた状態で、かつ、第一金属部材1、第二金属部材10及び補助部材20Aと攪拌ピンF2とを接触させた状態で接合用回転ツールFを相対移動させる。 In the friction stir welding step, only the stirring pin F2 rotated counterclockwise is inserted, and the metal member to be joined and the connecting portion F1 are relatively moved while being separated from each other. In other words, friction stir welding is performed with the base end portion of the stirring pin F2 exposed. Here, as shown in FIG. 10, a line passing through the end surface 20a of the auxiliary member 20A and orthogonal to the first metal member 1 and the second metal member 10 is defined as a reference line Z. In the friction stir welding step, as shown in FIG. 11, the rotation center axis Fc of the joining rotation tool F is overlapped with the reference line Z, and the first metal member 1, the second metal member 10, and the auxiliary member 20A are combined. The joining rotation tool F is relatively moved in contact with the stirring pin F2.

本実施形態では、接合用回転ツールFのシアー側(advancing side:回転ツールの外周における接線速度に回転ツールの移動速度が加算される側)が進行方向右側となるように、接合用回転ツールFの移動方向と回転方向を設定している。接合用回転ツールFの回転方向及び進行方向は前記したものに限定されるものではなく適宜設定すればよい。 In the present embodiment, the joining rotation tool F is set so that the shear side of the joining rotation tool F (advancing side: the side where the moving speed of the rotating tool is added to the tangential velocity on the outer circumference of the rotating tool) is on the right side in the traveling direction. The movement direction and rotation direction of are set. The rotation direction and the traveling direction of the joining rotation tool F are not limited to those described above, and may be appropriately set.

例えば、接合用回転ツールFの回転速度が遅い場合では、塑性化領域Wのフロー側(retreating side:回転ツールの外周における接線速度から回転ツールの移動速度が減算される側)に比べてシアー側の方が塑性流動材の温度が上昇しやすくなるため、塑性化領域W外のシアー側にバリVが多く発生する傾向にある。一方、例えば、接合用回転ツールFの回転速度が速い場合、シアー側の方が塑性流動材の温度が上昇するものの、回転速度が速い分、塑性化領域W外のフロー側にバリVが多く発生する傾向にある。 For example, when the rotation speed of the joining rotation tool F is slow, the shear side is compared with the flow side (retreating side: the side where the movement speed of the rotation tool is subtracted from the tangential velocity on the outer circumference of the rotation tool) of the plasticized region W. In this case, the temperature of the plastic fluid material tends to rise, so that a large amount of burr V tends to occur on the shear side outside the plasticized region W. On the other hand, for example, when the rotation speed of the joining rotation tool F is high, the temperature of the plastic fluid material rises on the shear side, but the rotation speed is high, so that there are many burrs V on the flow side outside the plasticization region W. It tends to occur.

本実施形態では、接合用回転ツールFの回転速度を速く設定しているため、図12に示すように、塑性化領域W外のフロー側にバリVが多く発生する傾向にある。また、接合用回転ツールFの回転速度を速く設定することにより、接合用回転ツールFの移動速度(送り速度)を高めることができる。これにより、接合サイクルを短くすることができる。 In the present embodiment, since the rotation speed of the joining rotation tool F is set to be high, as shown in FIG. 12, a large amount of burrs V tend to occur on the flow side outside the plasticization region W. Further, by setting the rotation speed of the joining rotation tool F to be high, the moving speed (feeding speed) of the joining rotation tool F can be increased. As a result, the joining cycle can be shortened.

摩擦攪拌工程の際に、接合用回転ツールFの進行方向のどちら側にバリVが多く発生するかは接合条件によって異なる。当該接合条件とは、接合用回転ツールFの回転速度、回転方向、移動速度(送り速度)、攪拌ピンF2の傾斜角度(テーパー角度)、第一金属部材1、第二金属部材10及び補助部材20Aの材質、厚さ等の各要素とこれらの要素の組み合わせで決定される。摩擦攪拌工程では、バリVが補助部材20Aに形成されるように接合条件を設定することが好ましい。 In the friction stir step, which side of the joining rotary tool F in which the burr V is generated in the traveling direction depends on the joining conditions. The joining conditions include the rotation speed, rotation direction, movement speed (feed speed) of the joining rotation tool F, the inclination angle (taper angle) of the stirring pin F2, the first metal member 1, the second metal member 10, and the auxiliary member. It is determined by each element such as the material and thickness of 20A and the combination of these elements. In the friction stir welding step, it is preferable to set the joining conditions so that the burr V is formed on the auxiliary member 20A.

攪拌ピンF2の挿入深さは、本実施形態では、攪拌ピンF2が第一金属部材1に達するように設定している。なお、攪拌ピンF2を第二金属部材10及び補助部材20Aのみに接触させた状態で重合部J1を摩擦攪拌するようにしてもよい。この場合は、攪拌ピンF2と第二金属部材10及び補助部材20Aとの摩擦熱によって重合部J1が塑性流動化して接合される。接合用回転ツールFの移動軌跡には塑性化領域Wが形成される。 In the present embodiment, the insertion depth of the stirring pin F2 is set so that the stirring pin F2 reaches the first metal member 1. The polymerized portion J1 may be frictionally agitated with the stirring pin F2 in contact with only the second metal member 10 and the auxiliary member 20A. In this case, the polymerized portion J1 is plastically fluidized and joined by the frictional heat between the stirring pin F2, the second metal member 10 and the auxiliary member 20A. A plasticized region W is formed in the movement locus of the joining rotation tool F.

除去工程は、図13に示すように、補助部材20Aを第二金属部材10から除去する工程である。除去工程では、例えば手作業により、補助部材20Aを矢印で示すように第二金属部材10から離間する方向に折り曲げて第二金属部材10から除去する。これにより、第一金属部材1及び第二金属部材10が板厚方向に接合される。 The removing step is a step of removing the auxiliary member 20A from the second metal member 10 as shown in FIG. In the removing step, for example, the auxiliary member 20A is manually bent in a direction away from the second metal member 10 as shown by an arrow and removed from the second metal member 10. As a result, the first metal member 1 and the second metal member 10 are joined in the plate thickness direction.

以上説明した本実施形態に係る接合方法によれば、第一金属部材1と第二金属部材10とが接合されるとともに、第一金属部材1及び第二金属部材10に加え、補助部材20Aも同時に摩擦攪拌接合されることにより、接合部(塑性化領域W)の金属不足を防ぐことができる。これにより、第二金属部材10の表面に凹溝が形成されるのを防ぐことができる。 According to the joining method according to the present embodiment described above, the first metal member 1 and the second metal member 10 are joined, and in addition to the first metal member 1 and the second metal member 10, the auxiliary member 20A is also formed. By friction stir welding at the same time, it is possible to prevent metal shortage in the joint portion (plasticized region W). This makes it possible to prevent the formation of concave grooves on the surface of the second metal member 10.

また、本実施形態によれば、摩擦攪拌工程によって補助部材20AにバリVが形成されるが、除去工程において補助部材20Aごと取り除くことができる。これにより、バリVを除去する作業を容易に行うことができる。補助部材20Aは除去装置等を用いて除去してもよいが、本実施形態では矢印で示す方向に、手作業で容易に補助部材20Aを取り除くことができる。 Further, according to the present embodiment, the burr V is formed on the auxiliary member 20A by the friction stir welding step, but the auxiliary member 20A can be removed together with the auxiliary member 20A in the removing step. As a result, the work of removing the burr V can be easily performed. The auxiliary member 20A may be removed by using a removing device or the like, but in the present embodiment, the auxiliary member 20A can be easily removed manually in the direction indicated by the arrow.

[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。図14〜図17に示すように、第三実施形態に係る接合方法では、攪拌ピンF2の挿入位置が第二実施形態と主に相違する。第三実施形態に係る接合方法では、第二実施形態と相違する点を中心に説明する。第三実施形態に係る接合方法は、重合工程と、配置工程と、摩擦攪拌工程と、除去工程とを行う。
[Third Embodiment]
Next, the joining method according to the third embodiment of the present invention will be described. As shown in FIGS. 14 to 17, in the joining method according to the third embodiment, the insertion position of the stirring pin F2 is mainly different from that of the second embodiment. The joining method according to the third embodiment will mainly explain the differences from the second embodiment. The joining method according to the third embodiment includes a polymerization step, an arrangement step, a friction stir welding step, and a removal step.

重合工程は、第二実施形態と同じであるため説明を省略する。図14に示すように、配置工程では、第一実施形態と同じ要領で第二金属部材10の表面に補助部材20Bを配置する。補助部材20Bは、第一実施形態の補助部材20の半分程度の幅になっている。 Since the polymerization step is the same as that of the second embodiment, the description thereof will be omitted. As shown in FIG. 14, in the arrangement step, the auxiliary member 20B is arranged on the surface of the second metal member 10 in the same manner as in the first embodiment. The auxiliary member 20B has a width of about half that of the auxiliary member 20 of the first embodiment.

摩擦攪拌工程は、図15に示すように、接合用回転ツールFを用いて第一金属部材1と第二金属部材10との重合部J1を摩擦攪拌によって接合する工程である。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、攪拌ピンF2の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。 As shown in FIG. 15, the friction stir welding step is a step of joining the superposed portion J1 of the first metal member 1 and the second metal member 10 by friction stir welding using the joining rotary tool F. In the present embodiment, in order to rotate the joining rotation tool F clockwise, the spiral groove of the stirring pin F2 is formed counterclockwise from the base end to the tip end.

摩擦攪拌工程では、図14に示すように、接合用回転ツールFの回転中心軸Fcを、補助部材20Bの端面20aを通る基準線Zよりもわずかに補助部材20Bの中央側となるように位置させつつ、重合部J1に右回転させた攪拌ピンF2のみを挿入し、被接合金属部材と連結部F1とは離間させつつ相対移動させる。本実施形態では、図15に示すように、接合用回転ツールFの進行方向右側に補助部材20Bが位置するように接合用回転ツールFの進行方向を設定し、高速回転させる。これにより、本実施形態では、図16に示すように、補助部材20B側がフロー側となり、補助部材20BにバリVが発生する。本実施形態における接合用回転ツールFの挿入位置(接合用回転ツールFの回転中心軸Fcと基準線Zとの距離)は、摩擦攪拌工程を行った後に接合用回転ツールFの片側にのみ補助部材20Bが残存する程度に適宜調節する。 In the friction stir welding step, as shown in FIG. 14, the rotation center axis Fc of the joining rotation tool F is positioned so as to be slightly closer to the center side of the auxiliary member 20B than the reference line Z passing through the end face 20a of the auxiliary member 20B. Only the stirring pin F2 rotated clockwise is inserted into the superposed portion J1 so that the metal member to be joined and the connecting portion F1 are relatively moved while being separated from each other. In the present embodiment, as shown in FIG. 15, the traveling direction of the joining rotation tool F is set so that the auxiliary member 20B is located on the right side of the traveling direction of the joining rotation tool F, and the joint rotation tool F is rotated at high speed. As a result, in the present embodiment, as shown in FIG. 16, the auxiliary member 20B side becomes the flow side, and the burr V is generated in the auxiliary member 20B. The insertion position of the joining rotation tool F in the present embodiment (distance between the rotation center axis Fc of the joining rotation tool F and the reference line Z) is assisted only on one side of the joining rotation tool F after performing the friction stirring step. Adjust appropriately so that the member 20B remains.

除去工程は、図17に示すように、補助部材20Bを第二金属部材10から除去する工程である。除去工程では、例えば手作業により、補助部材20Bを第二金属部材10から離間する方向(矢印方向)に折り曲げて第二金属部材10から除去する。 The removing step is a step of removing the auxiliary member 20B from the second metal member 10 as shown in FIG. In the removing step, for example, the auxiliary member 20B is manually bent in the direction away from the second metal member 10 (in the direction of the arrow) and removed from the second metal member 10.

以上説明した本実施形態に係る接合方法によれば、第一金属部材1と第二金属部材10とが接合されるとともに、第一金属部材1及び第二金属部材10に加え、補助部材20Bも同時に摩擦攪拌接合されることにより、接合部(塑性化領域W)の金属不足を防ぐことができる。 According to the joining method according to the present embodiment described above, the first metal member 1 and the second metal member 10 are joined, and in addition to the first metal member 1 and the second metal member 10, the auxiliary member 20B is also formed. By friction stir welding at the same time, it is possible to prevent metal shortage in the joint portion (plasticized region W).

また、本実施形態の接合条件によれば、接合用回転ツールFの回転速度を速く設定しているため、フロー側にバリVが多く発生する傾向にある。つまり、本実施形態ではバリVが補助部材20Bに多く形成されるように接合用回転ツールFの回転方向及び進行方向等(接合条件)を設定している。これにより、補助部材20Bに形成されたバリVは、補助部材20Bごと除去されるため、バリ除去工程をより容易に行うことができる。補助部材20Bは除去装置等を用いてもよいが、本実施形態では手作業で容易に補助部材20Bを取り除くことができる。 Further, according to the joining conditions of the present embodiment, since the rotation speed of the joining rotation tool F is set to be high, a large number of burrs V tend to occur on the flow side. That is, in the present embodiment, the rotation direction, the traveling direction, and the like (joining conditions) of the joining rotation tool F are set so that a large number of burrs V are formed on the auxiliary member 20B. As a result, the burr V formed on the auxiliary member 20B is removed together with the auxiliary member 20B, so that the burr removing step can be performed more easily. A removing device or the like may be used for the auxiliary member 20B, but in the present embodiment, the auxiliary member 20B can be easily removed manually.

ここで、前記した第一実施形態の除去工程では、塑性化領域Wの中央を挟んで両側にある補助部材20,20除去する必要がある。しかし、本実施形態では摩擦攪拌工程後に一方側(接合用回転ツールFの進行方向左側)に補助部材20Bが残存しないように攪拌ピンF2の挿入位置を調節しているため、除去工程では他方側に残存する補助部材20Bを除去するだけでよい。これにより除去工程の作業手間を少なくすることができる。また、回転中心軸Fcが、基準線Zよりもわずかに補助部材20Bの中央側に偏移しているため、接合部の金属不足をバランス良く、かつ、より確実に防ぐことができる。また、回転中心軸Fcが、基準線Zよりもわずかに補助部材20Bの中央側に偏移しているため、攪拌ピンF2を補助部材20Bに容易に挿入することができる。 Here, in the removal step of the first embodiment described above, it is necessary to remove the auxiliary members 20 and 20 on both sides of the center of the plasticized region W. However, in the present embodiment, since the insertion position of the stirring pin F2 is adjusted so that the auxiliary member 20B does not remain on one side (left side in the traveling direction of the joining rotation tool F) after the friction stirring step, the other side is adjusted in the removing step. It is only necessary to remove the auxiliary member 20B remaining in the. As a result, the labor of the removal process can be reduced. Further, since the rotation center axis Fc is slightly shifted to the center side of the auxiliary member 20B from the reference line Z, the metal shortage at the joint portion can be prevented in a well-balanced manner and more reliably. Further, since the rotation center axis Fc is slightly shifted to the center side of the auxiliary member 20B from the reference line Z, the stirring pin F2 can be easily inserted into the auxiliary member 20B.

[他の実施形態]
次に、本発明の他の実施形態について説明する。他の実施形態に係る接合方法では、重合工程と、摩擦攪拌工程と、除去工程とを行う。他の実施形態では、金属部材同士が上下に湾曲している点で第一実施形態〜第三実施形態と相違する。
[Other Embodiments]
Next, other embodiments of the present invention will be described. In the joining method according to another embodiment, a polymerization step, a friction stir welding step, and a removal step are performed. The other embodiment differs from the first to third embodiments in that the metal members are curved vertically.

図18に示すように、重合工程では、第一金属部材30と、第二金属部材40とを重ね合わせる。第一金属部材30及び第二金属部材40は、摩擦攪拌可能な金属で形成されるとともに、第一金属部材30の表面30aと、板状の第二金属部材40の表面40a及び裏面40bとが、同等の曲率半径で湾曲形成されている。第一金属部材30の表面30aと、第二金属部材40の裏面40bとを重ね合わせることにより、重合部J2が形成される。 As shown in FIG. 18, in the polymerization step, the first metal member 30 and the second metal member 40 are superposed. The first metal member 30 and the second metal member 40 are made of a metal that can be frictionally agitated, and the front surface 30a of the first metal member 30 and the front surface 40a and the back surface 40b of the plate-shaped second metal member 40 are formed. , It is curved with the same radius of curvature. The overlapping portion J2 is formed by superimposing the front surface 30a of the first metal member 30 and the back surface 40b of the second metal member 40.

配置工程では、第二金属部材40と同形状に湾曲した板状の補助部材50の裏面50bを、第二金属部材40の表面40aに面接触させる。なお、第一金属部材30、第二金属部材40及び補助部材50は、治具(図示省略)を用いて架台Tに移動不能に拘束される。 In the arranging step, the back surface 50b of the plate-shaped auxiliary member 50 curved in the same shape as the second metal member 40 is brought into surface contact with the front surface 40a of the second metal member 40. The first metal member 30, the second metal member 40, and the auxiliary member 50 are immovably restrained by the gantry T by using a jig (not shown).

摩擦攪拌工程は、接合用回転ツールFを用いて重合部J2を摩擦攪拌接合する工程である。摩擦攪拌工程では、接合用回転ツールFの攪拌ピンF2を補助部材50の表面50aから第二金属部材40を介して第一金属部材30まで挿入し、重合部J2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、接合用回転ツールFの回転中心軸Fcが補助部材50及び第二金属部材40の法線と重なるように、接合用回転ツールFの傾斜角度を漸次変更する。また、摩擦攪拌工程では、塑性化領域W1が一定になるように攪拌ピンF2の挿入深さを設定する。除去工程は、第一実施形態と同等であるため説明を省略する。 The friction stir welding step is a step of friction stir welding the polymerized portion J2 using the joining rotary tool F. In the friction stir welding step, the stirring pin F2 of the joining rotation tool F is inserted from the surface 50a of the auxiliary member 50 to the first metal member 30 via the second metal member 40, and the joining rotation tool F is inserted along the overlapping portion J2. To move relative to each other. In the friction stir welding step, the inclination angle of the joining rotation tool F is gradually changed so that the rotation center axis Fc of the joining rotation tool F overlaps with the normals of the auxiliary member 50 and the second metal member 40. Further, in the friction stir welding step, the insertion depth of the stirring pin F2 is set so that the plasticized region W1 becomes constant. Since the removal step is the same as that of the first embodiment, the description thereof will be omitted.

以上説明した他の実施形態に係る接合方法のように、重合部J2が上下方向に湾曲して高さが変化する場合であっても、第一実施形態〜第三実施形態と略同等の効果を奏することができる。 Even when the polymerized portion J2 is curved in the vertical direction and the height changes as in the joining method according to the other embodiments described above, the effect is substantially the same as that of the first to third embodiments. Can be played.

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、本実施形態では除去工程を行ったが、補助部材を除去せずに、第二金属部材にそのまま存置してもよい。 Although the embodiments of the present invention have been described above, the design can be appropriately changed within a range not contrary to the gist of the present invention. For example, although the removal step was performed in the present embodiment, the auxiliary member may be left as it is in the second metal member without being removed.

1,30 第一金属部材
10,40 第二金属部材
20,50 補助部材
F 接合用回転ツール(回転ツール)
F1 連結部
F2 攪拌ピン
Fc 回転中心軸
J1,J2 重合部
V バリ
W 塑性化領域
Z 基準線
1,30 First metal member 10,40 Second metal member 20,50 Auxiliary member F Rotation tool for joining (rotation tool)
F1 Connection part F2 Stirring pin Fc Rotation center axis J1, J2 Polymerization part V Bali W Plasticization area Z Reference line

Claims (2)

攪拌ピンを備えた回転ツールを用いて第一金属部材と第二金属部材とを接合する接合方法であって、
少なくとも表面の高さが変化する前記第一金属部材の表面に、少なくとも裏面の高さが変化する前記第二金属部材の裏面を重ね合せて高さが変化する重合部を形成する重合工程と、
前記第二金属部材の表面に面接触するように補助部材を配置する配置工程と、
回転する前記攪拌ピンを前記補助部材の表面側から挿入し、前記回転ツールの前記攪拌ピンのみを前記第二金属部材及び前記補助部材、又は、前記第一金属部材、前記第二金属部材及び前記補助部材に接触させた状態で前記回転ツールを相対移動させて前記第一金属部材、前記第二金属部材及び前記補助部材を接合する摩擦攪拌工程と、
バリが形成された前記補助部材を前記第二金属部材から除去する除去工程と、を含み、
前記補助部材の端面を通り前記第一金属部材及び前記第二金属部材に直交する線を基準線とした場合、
前記摩擦攪拌工程では、前記回転ツールの回転中心軸と前記基準線とが重なるように前記攪拌ピンを相対移動させるとともに、バリが前記補助部材に形成されるように接合条件を設定することを特徴とする接合方法。
A joining method for joining a first metal member and a second metal member using a rotating tool equipped with a stirring pin.
A polymerization step of superimposing at least the back surface of the second metal member whose height changes on the back surface on the surface of the first metal member whose surface height changes to form a polymerized portion whose height changes.
An arrangement step of arranging the auxiliary member so as to make surface contact with the surface of the second metal member, and
The rotating stirring pin is inserted from the surface side of the auxiliary member, and only the stirring pin of the rotating tool is inserted into the second metal member and the auxiliary member, or the first metal member, the second metal member, and the said. A friction stir step of joining the first metal member, the second metal member, and the auxiliary member by relatively moving the rotating tool in contact with the auxiliary member.
Including a removal step of removing the burr-formed auxiliary member from the second metal member.
When a line passing through the end face of the auxiliary member and orthogonal to the first metal member and the second metal member is used as a reference line.
In the friction stirring step, the stirring pin so that the rotational center axis and said reference line is overlapped causes relative movement of the rotary tool, that you set the welding conditions such burrs are formed in the auxiliary member A characteristic joining method.
攪拌ピンを備えた回転ツールを用いて第一金属部材と第二金属部材とを接合する接合方法であって、A joining method for joining a first metal member and a second metal member using a rotating tool equipped with a stirring pin.
少なくとも表面の高さが変化する前記第一金属部材の表面に、少なくとも裏面の高さが変化する前記第二金属部材の裏面を重ね合せて高さが変化する重合部を形成する重合工程と、A polymerization step of superimposing at least the back surface of the second metal member whose height changes on the back surface on the surface of the first metal member whose surface height changes to form a polymerized portion whose height changes.
前記第二金属部材の表面に面接触するように補助部材を配置する配置工程と、An arrangement step of arranging the auxiliary member so as to make surface contact with the surface of the second metal member, and
回転する前記攪拌ピンを前記補助部材の表面側から挿入し、前記回転ツールの前記攪拌ピンのみを前記第二金属部材及び前記補助部材、又は、前記第一金属部材、前記第二金属部材及び前記補助部材に接触させた状態で前記回転ツールを相対移動させて前記第一金属部材、前記第二金属部材及び前記補助部材を接合する摩擦攪拌工程と、The rotating stirring pin is inserted from the surface side of the auxiliary member, and only the stirring pin of the rotating tool is inserted into the second metal member and the auxiliary member, or the first metal member, the second metal member, and the said. A friction stir step of joining the first metal member, the second metal member, and the auxiliary member by relatively moving the rotating tool in contact with the auxiliary member.
バリが形成された前記補助部材を前記第二金属部材から除去する除去工程と、を含み、Including a removal step of removing the burr-formed auxiliary member from the second metal member.
前記補助部材の端面を通り前記第一金属部材及び前記第二金属部材に直交する線を基準線とした場合、When a line passing through the end face of the auxiliary member and orthogonal to the first metal member and the second metal member is used as a reference line.
前記摩擦攪拌工程では、前記摩擦攪拌工程を行った後に前記回転ツールの片側にのみ補助部材が残存する程度に前記回転ツールの回転中心軸を前記基準線よりもわずかに前記補助部材の中央側に偏移させて相対移動させるとともに、残存する前記補助部材にバリが形成されるように接合条件を設定することを特徴とする接合方法。In the friction stir welding step, the rotation center axis of the rotation tool is slightly closer to the center side of the auxiliary member than the reference line to the extent that the auxiliary member remains only on one side of the rotary tool after the friction stir welding step. A joining method characterized in that the joining conditions are set so that burrs are formed on the remaining auxiliary member while being shifted and moved relative to each other.
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