JP2021079423A

JP2021079423A - Friction stir welding method

Info

Publication number: JP2021079423A
Application number: JP2019210696A
Authority: JP
Inventors: 堀　久司; Hisashi Hori; 久司堀; 伸城瀬尾; Nobushiro Seo
Original assignee: Nippon Light Metal Co Ltd
Current assignee: Nippon Light Metal Co Ltd
Priority date: 2019-11-21
Filing date: 2019-11-21
Publication date: 2021-05-27

Abstract

To provide a friction stir welding method that can suitably weld an aluminium alloy made of different kinds of materials to each other.SOLUTION: A friction stir welding method includes a main welding step in which a stirring pin F2 of a rotary tool F that rotates is inserted into an outer peripheral surface 21b of a second metal member 2, and a butted part J1 is subjected to friction-stir by circling the part around the outer peripheral surface 21b of the second metal member 2 at a predetermined depth along a set movement route L1 set closer to the second metal member 2 than the butted part J1, while flowing a second aluminium alloy into a gap, in a state where an outer peripheral surface of the stirring pin F2 is slightly contacted with a step inclined surface 13a of a first metal member 1. In a separation section in the main welding step, the stirring pin F2 is moved up to above an inclined base 50 formed on an outer peripheral surface 11b of the first metal member 1 and then the stirring pin F2 is pulled out. The inclined base 50 is removed after the main welding step.SELECTED DRAWING: Figure 2

Description

本発明は、摩擦攪拌接合方法に関する。 The present invention relates to a friction stir welding method.

金属部材同士を接合する技術として、摩擦攪拌接合が知られている。摩擦攪拌接合では、回転ツールに備えられた攪拌ピンを金属部材から引き抜く際に、引抜き穴が残ってしまうという課題がある。そこで、金属部材に引抜き穴が残らないようにする接合方法が知られている。例えば、特許文献１に係る接合方法では、攪拌ピンを移動させながら徐々に引き抜くことによって、引抜き痕を小さくする方法が開示されている。 Friction stir welding is known as a technique for joining metal members to each other. Friction stir welding has a problem that a drawing hole remains when the stirring pin provided in the rotary tool is pulled out from the metal member. Therefore, a joining method is known in which a drawing hole is not left in the metal member. For example, in the joining method according to Patent Document 1, a method of reducing the drawing marks by gradually pulling out while moving the stirring pin is disclosed.

特開２０１６−８７６４９号公報Japanese Unexamined Patent Publication No. 2016-87649

しかし、特許文献１の接合方法では、回転ツールを徐々に引き抜く際に、塑性化領域に引抜き痕が残ってしまうという課題がある。
そこで本発明は、支柱と蓋部材を摩擦攪拌によって接合する際に、攪拌ピンによる引抜き穴及び引抜き痕の発生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。 However, the joining method of Patent Document 1 has a problem that a drawing mark remains in the plasticized region when the rotating tool is gradually pulled out.
Therefore, it is an object of the present invention to provide a joining method capable of preventing the occurrence of pull-out holes and pull-out marks by a stirring pin when joining a support column and a lid member by friction stir welding.

前記課題を解決するために、本発明は、大径部の端部に小径部を備えた柱状の第一金属部材と、前記小径部と略同等の内径を有する筒状の第二金属部材とを端部同士で突き合わせて形成された被接合金属部材の突合せ部に対して、攪拌ピンを備える回転ツールを用いて摩擦攪拌を行う摩擦攪拌接合方法であって、前記第一金属部材は第一アルミニウム合金で形成されており、前記第二金属部材は第二アルミニウム合金で形成されており、前記第一アルミニウム合金は前記第二アルミニウム合金よりも硬度が高い材種であり、前記攪拌ピンは先細りとなっており、前記第一金属部材の前記大径部と前記小径部との境に近接するとともに前記第一金属部材の外周面から突出する傾斜台を形成する準備工程と、前記第二金属部材の開口部に前記第一金属部材の前記小径部を挿入することにより、前記第二金属部材の内周面と前記第一金属部材の段差側面とを重ね合わせるとともに、前記第二金属部材の端面と前記第一金属部材の段差傾斜面とを突き合わせて前記突合せ部に断面Ｖ字状の隙間を形成する突合せ工程と、回転する前記回転ツールの前記攪拌ピンを前記第二金属部材の外周面に挿入し、前記攪拌ピンの外周面を前記第一金属部材の前記段差傾斜面にわずかに接触させた状態で、前記隙間に前記第二アルミニウム合金を流入させながら、前記突合せ部よりも前記第二金属部材側に設定された設定移動ルートに沿って所定の深さで前記第二金属部材の外周面の廻りに一周させて前記突合せ部に摩擦攪拌を行った後、前記攪拌ピンを前記傾斜台の傾斜面に沿って昇るように移動させて当該傾斜面の上側で引抜く本接合工程と、前記傾斜台を除去する傾斜台除去工程と、を含むことを特徴とする。 In order to solve the above problems, the present invention comprises a columnar first metal member having a small diameter portion at the end of the large diameter portion, and a tubular second metal member having an inner diameter substantially equal to that of the small diameter portion. This is a friction-stirring joining method in which friction-stirring is performed by using a rotating tool provided with a stirring pin on the abutting portion of the metal member to be joined, which is formed by abutting the ends of the first metal member. It is made of an aluminum alloy, the second metal member is made of a second aluminum alloy, the first aluminum alloy is a grade having a higher hardness than the second aluminum alloy, and the stirring pin is tapered. The preparatory step of forming an inclined table that is close to the boundary between the large-diameter portion and the small-diameter portion of the first metal member and protrudes from the outer peripheral surface of the first metal member, and the second metal. By inserting the small diameter portion of the first metal member into the opening of the member, the inner peripheral surface of the second metal member and the stepped side surface of the first metal member are overlapped, and the second metal member The butt step of abutting the end surface and the stepped inclined surface of the first metal member to form a gap having a V-shaped cross section in the butt portion, and the stirring pin of the rotating tool are used as the outer peripheral surface of the second metal member. The second aluminum alloy is allowed to flow into the gap in a state where the outer peripheral surface of the stirring pin is slightly in contact with the stepped inclined surface of the first metal member. (Ii) Along the set movement route set on the metal member side, the second metal member is made to go around the outer peripheral surface of the second metal member at a predetermined depth, and frictional stirring is performed on the abutting portion, and then the stirring pin is tilted. It is characterized by including a main joining step of moving the table so as to rise along the inclined surface and pulling it out on the upper side of the inclined surface, and an inclined table removing step of removing the inclined surface.

また、本発明は、大径部の端部に小径部を備えた柱状の第一金属部材と、前記小径部と略同等の内径を有する筒状の第二金属部材とを端部同士で突き合わせて形成された被接合金属部材の突合せ部に対して、攪拌ピンを備える回転ツールを用いて摩擦攪拌を行う摩擦攪拌接合方法であって、前記第一金属部材は第一アルミニウム合金で形成されており、前記第二金属部材は第二アルミニウム合金で形成されており、前記第一アルミニウム合金は前記第二アルミニウム合金よりも硬度が高い材種であり、前記攪拌ピンは先細りとなっており、前記第二金属部材の端面に近接するとともに前記第二金属部材の外周面から突出する傾斜台を形成する準備工程と、前記第二金属部材の前記傾斜台側の開口部に前記第一金属部材の前記小径部を挿入することにより、前記第二金属部材の内周面と前記第一金属部材の段差側面とを重ね合わせるとともに、前記第二金属部材の端面と前記第一金属部材の段差傾斜面とを突き合わせて突合せ部に断面Ｖ字状の隙間を形成する突合せ工程と、回転する前記回転ツールの前記攪拌ピンを前記第二金属部材の外周面に挿入し、前記攪拌ピンの外周面を前記第一金属部材の前記段差傾斜面にわずかに接触させた状態で、前記隙間に前記第二アルミニウム合金を流入させながら、前記突合せ部よりも前記第二金属部材側に設定された設定移動ルートに沿って所定の深さで前記第二金属部材の外周面の廻りに一周させて前記突合せ部に摩擦攪拌を行った後、前記攪拌ピンを前記傾斜台の傾斜面に沿って昇るように移動させて当該傾斜面の上側で引抜く本接合工程と、前記傾斜台を除去する傾斜台除去工程と、を含むことを特徴とする。 Further, in the present invention, a columnar first metal member having a small diameter portion at the end of a large diameter portion and a tubular second metal member having an inner diameter substantially equal to that of the small diameter portion are butted against each other. This is a friction stirring joining method in which friction stirring is performed on the abutting portion of the metal member to be joined formed by using a rotating tool provided with a stirring pin, and the first metal member is formed of a first aluminum alloy. The second metal member is made of a second aluminum alloy, the first aluminum alloy is a grade having a higher hardness than the second aluminum alloy, and the stirring pin is tapered. A preparatory step for forming an inclined table that is close to the end surface of the second metal member and projects from the outer peripheral surface of the second metal member, and the opening of the second metal member on the inclined table side of the first metal member. By inserting the small diameter portion, the inner peripheral surface of the second metal member and the stepped side surface of the first metal member are overlapped, and the end surface of the second metal member and the stepped inclined surface of the first metal member are overlapped. In the butt step of forming a gap having a V-shaped cross section in the butt portion, the stirring pin of the rotating tool is inserted into the outer peripheral surface of the second metal member, and the outer peripheral surface of the stirring pin is inserted into the outer peripheral surface of the second metal member. In a state where the first metal member is slightly in contact with the stepped inclined surface, the second aluminum alloy is allowed to flow into the gap, and the set movement route is set to the second metal member side with respect to the butt portion. Around the outer peripheral surface of the second metal member at a predetermined depth, frictional stirring is performed on the butt portion, and then the stirring pin is moved so as to rise along the inclined surface of the inclined table. It is characterized by including a main joining step of pulling out on the upper side of the inclined surface and an inclined table removing step of removing the inclined table.

また、本発明は、大径部の端部に小径部を備えた円柱状の第一金属部材と、前記小径部と略同等の内径を有する円筒状の第二金属部材とを端面同士で突き合わせて形成された被接合金属部材の突合せ部に対して攪拌ピンを備える回転ツールを用いて摩擦攪拌を行う摩擦攪拌接合方法であって、前記第一金属部材は第一アルミニウム合金で形成されており、前記第二金属部材は第二アルミニウム合金で形成されており、前記第一アルミニウム合金は前記第二アルミニウム合金よりも硬度が高い材種であり、前記攪拌ピンは先細りとなっており、前記第一金属部材の前記大径部と前記小径部との境に近接するとともに前記第一金属部材の外周面から突出する傾斜台を形成する準備工程と、前記第二金属部材の開口部に前記第一金属部材の前記小径部を挿入することにより、前記第二金属部材の内周面と前記第一金属部材の段差側面とを重ね合わせるとともに、前記第二金属部材の端面と前記第一金属部材の段差傾斜面とを突き合わせて突合せ部に断面Ｖ字状の隙間を形成する突合せ工程と、回転する前記回転ツールの前記攪拌ピンを前記第二金属部材の外周面に挿入し、前記攪拌ピンの外周面を前記第一金属部材の前記段差傾斜面にわずかに接触させた状態で、前記隙間に前記第二アルミニウム合金を流入させながら、前記突合せ部よりも前記第二金属部材側に設定された設定移動ルートに沿って所定の深さで前記第二金属部材の外周面の廻りに一周させて前記突合せ部に摩擦攪拌を行った後、前記攪拌ピンを前記傾斜台の傾斜面に沿って昇るように移動させて当該傾斜面の上側で引抜く本接合工程と、前記傾斜台を除去する傾斜台除去工程と、を含むことを特徴とする。 Further, in the present invention, a columnar first metal member having a small diameter portion at the end of a large diameter portion and a cylindrical second metal member having an inner diameter substantially equal to that of the small diameter portion are butted against each other. This is a friction stirring joining method in which friction stirring is performed by using a rotary tool provided with a stirring pin for the abutting portion of the metal member to be joined, and the first metal member is made of a first aluminum alloy. The second metal member is formed of a second aluminum alloy, the first aluminum alloy is a grade having a higher hardness than the second aluminum alloy, and the stirring pin is tapered, and the first A preparatory step of forming an inclined table that is close to the boundary between the large-diameter portion and the small-diameter portion of the metal member and projects from the outer peripheral surface of the first metal member, and the first opening of the second metal member. By inserting the small diameter portion of the one metal member, the inner peripheral surface of the second metal member and the stepped side surface of the first metal member are overlapped, and the end surface of the second metal member and the first metal member are overlapped. A butt step of abutting the stepped inclined surfaces of the above to form a gap having a V-shaped cross section in the abutting portion, and inserting the stirring pin of the rotating tool into the outer peripheral surface of the second metal member to form a gap of the stirring pin. With the outer peripheral surface slightly in contact with the stepped inclined surface of the first metal member, the second aluminum alloy was set to be closer to the second metal member side than the butt portion while flowing the second aluminum alloy into the gap. After frictionally stirring the butt portion by making a circumference around the outer peripheral surface of the second metal member at a predetermined depth along the set movement route, the stirring pin rises along the inclined surface of the inclined table. It is characterized by including a main joining step of moving and pulling out on the upper side of the inclined surface, and an inclined table removing step of removing the inclined table.

また、本発明は、大径部の端部に小径部を備えた円柱状の第一金属部材と、前記小径部と略同等の内径を有する円筒状の第二金属部材とを端面同士で突き合わせて形成された被接合金属部材の突合せ部に対して攪拌ピンを備える回転ツールを用いて摩擦攪拌を行う摩擦攪拌接合方法であって、前記第一金属部材は第一アルミニウム合金で形成されており、前記第二金属部材は第二アルミニウム合金で形成されており、前記第一アルミニウム合金は前記第二アルミニウム合金よりも硬度が高い材種であり、前記攪拌ピンは先細りとなっており、前記第二金属部材の端面に近接するとともに前記第二金属部材の外周面から突出する傾斜台を形成する準備工程と、前記第二金属部材の前記傾斜台側の開口部に前記第一金属部材の前記小径部を挿入することにより、前記第二金属部材の内周面と前記第一金属部材の段差側面とを重ね合わせるとともに、前記第二金属部材の端面と前記第一金属部材の段差傾斜面とを突き合わせて突合せ部に断面Ｖ字状の隙間を形成する突合せ工程と、回転する前記回転ツールの前記攪拌ピンを前記第二金属部材の外周面に挿入し、前記攪拌ピンの外周面を前記第一金属部材の前記段差傾斜面にわずかに接触させた状態で、前記隙間に前記第二アルミニウム合金を流入させながら、前記突合せ部よりも前記第二金属部材側に設定された設定移動ルートに沿って所定の深さで前記第二金属部材の外周面の廻りに一周させて前記突合せ部に摩擦攪拌を行った後、前記攪拌ピンを前記傾斜台の傾斜面に沿って昇るように移動させて当該傾斜面の上側で引抜く本接合工程と、前記傾斜台を除去する傾斜台除去工程と、を含むことを特徴とする。 Further, in the present invention, a columnar first metal member having a small diameter portion at the end of a large diameter portion and a cylindrical second metal member having an inner diameter substantially equal to that of the small diameter portion are butted against each other. This is a friction stirring joining method in which friction stirring is performed by using a rotary tool provided with a stirring pin for the abutting portion of the metal member to be joined, and the first metal member is made of a first aluminum alloy. The second metal member is formed of a second aluminum alloy, the first aluminum alloy is a grade having a higher hardness than the second aluminum alloy, and the stirring pin is tapered, and the first (Ii) A preparatory step of forming an inclined table that is close to the end surface of the metal member and projects from the outer peripheral surface of the second metal member, and the opening of the second metal member on the inclined table side of the first metal member. By inserting the small diameter portion, the inner peripheral surface of the second metal member and the stepped side surface of the first metal member are overlapped, and the end surface of the second metal member and the stepped inclined surface of the first metal member are overlapped. The butting step of forming a gap having a V-shaped cross section in the butt portion, and the stirring pin of the rotating tool are inserted into the outer peripheral surface of the second metal member, and the outer peripheral surface of the stirring pin is the first. Along the set movement route set on the second metal member side with respect to the butt portion while allowing the second aluminum alloy to flow into the gap in a state of being slightly in contact with the stepped inclined surface of the metal member. After performing frictional stirring around the outer peripheral surface of the second metal member at a predetermined depth and frictionally stirring the abutting portion, the stirring pin is moved so as to rise along the inclined surface of the inclined table. It is characterized by including a main joining step of pulling out on the upper side of the inclined surface and an inclined table removing step of removing the inclined table.

かかる接合方法によれば、摩擦攪拌接合を行った後、突合せ部とは別の位置に設けられた傾斜台で攪拌ピンを引き抜くことができる。また、傾斜台は第一金属部材又は第二金属部材から除去することができる。これにより、第一金属部材又は第二金属部材に攪拌ピンによる引抜き穴及び引抜き痕が発生することを防ぐことができる。 According to such a joining method, after performing friction stir welding, the stirring pin can be pulled out on an inclined table provided at a position different from the butt portion. Further, the tilting table can be removed from the first metal member or the second metal member. As a result, it is possible to prevent the first metal member or the second metal member from having a pull-out hole and a pull-out mark due to the stirring pin.

本発明にかかる接合方法によれば、第一金属部材又は第二金属部材に攪拌ピンによる引抜き穴及び引抜き痕の発生を防ぐことができる。 According to the joining method according to the present invention, it is possible to prevent the occurrence of pull-out holes and pull-out marks by the stirring pin in the first metal member or the second metal member.

本発明の実施形態に係る回転ツールを示す側面図である。It is a side view which shows the rotation tool which concerns on embodiment of this invention. 本発明の第一実施形態に係る摩擦攪拌接合方法を示す斜視図である。It is a perspective view which shows the friction stir welding method which concerns on 1st Embodiment of this invention. 第一実施形態に係る摩擦攪拌接合方法の第一金属部材及び第二金属部材を示す斜視図である。It is a perspective view which shows the 1st metal member and the 2nd metal member of the friction stir welding method which concerns on 1st Embodiment. 第一実施形態に係る摩擦攪拌接合方法の突合せ工程を示す断面図である。It is sectional drawing which shows the butt process of the friction stir welding method which concerns on 1st Embodiment. 第一実施形態に係る摩擦攪拌接合方法の突合せ工程を示す斜視図である。It is a perspective view which shows the butt process of the friction stir welding method which concerns on 1st Embodiment. 第一実施形態に係る摩擦攪拌接合方法の本接合工程を示す斜視図である。It is a perspective view which shows the main joining process of the friction stir welding method which concerns on 1st Embodiment. 第一実施形態に係る摩擦攪拌接合方法の本接合工程を示す断面図である。It is sectional drawing which shows the main joining process of the friction stir welding method which concerns on 1st Embodiment. 第一実施形態に係る摩擦攪拌接合方法の本接合工程を示す断面図である。It is sectional drawing which shows the main joining process of the friction stir welding method which concerns on 1st Embodiment. 第二実施形態に係る摩擦攪拌接合方法の本接合工程を示す斜視図である。It is a perspective view which shows the main joining process of the friction stir welding method which concerns on 2nd Embodiment. 第一変形例に係る摩擦攪拌接合方法の準備工程を示す斜視図である。It is a perspective view which shows the preparation process of the friction stir welding method which concerns on the 1st modification. 第二変形例に係る摩擦攪拌接合方法の本接合工程における押入区間の摩擦攪拌を示す斜視図である。It is a perspective view which shows the friction stir of a closet section in the main joining process of the friction stir welding method which concerns on 2nd modification.

本発明の実施形態について、適宜図面を参照しながら説明する。まずは、本実施形態に係る接合方法で用いる回転ツールについて説明する。回転ツールは、摩擦攪拌接合に用いられるツールである。図１に示すように、回転ツールＦは、例えば工具鋼で形成されており、連結部Ｆ１と、攪拌ピンＦ２を有する。連結部Ｆ１は、円柱状を呈している。 Embodiments of the present invention will be described with reference to the drawings as appropriate. First, the rotation tool used in the joining method according to the present embodiment will be described. The rotary tool is a tool used for friction stir welding. As shown in FIG. 1, the rotary tool F is made of, for example, tool steel and has a connecting portion F1 and a stirring pin F2. 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、回転ツールＦを右回転させるため、螺旋溝が基端から先端に向けて左回りに刻設されている。 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 rotation tool F clockwise, a spiral groove is carved counterclockwise from the base end to the tip end.

なお、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けて右回りに刻設する。このようにすると、摩擦攪拌接合によって塑性流動化した金属が螺旋溝に導かれて攪拌ピンＦ２の先端側に移動する。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２）から溢れ出る金属を少なくすることができる。 When rotating the rotation tool F counterclockwise, the spiral groove is carved clockwise from the base end to the tip end. In this way, the metal plastically fluidized by friction stir welding is guided by the spiral groove and moves to the tip side of the stirring pin F2. As a result, the amount of metal overflowing from the metal member to be joined (first metal member 1, second metal member 2) can be reduced.

［第一実施形態］
本発明の第一実施形態について、適宜図面を参照しながら説明する。本実施形態に係る摩擦攪拌接合方法では、図２に示すように、第一金属部材１と、第二金属部材２を摩擦攪拌接合するというものである。第一金属部材１と第二金属部材２とを合わせて被接合金属部材Ｈとも言う。本実施形態に係る摩擦攪拌接合方法では、準備工程と、突合せ工程と、本接合工程と、傾斜台除去工程とを行う。 [First Embodiment]
The first embodiment of the present invention will be described with reference to the drawings as appropriate. In the friction stir welding method according to the present embodiment, as shown in FIG. 2, the first metal member 1 and the second metal member 2 are friction stir welded. The first metal member 1 and the second metal member 2 are collectively referred to as a metal member H to be joined. In the friction stir welding method according to the present embodiment, a preparation step, a butt step, a main joining step, and a tilting table removing step are performed.

準備工程は、傾斜台５０を備えた第一金属部材１及び第二金属部材２を準備する工程である。図３に示すように、第一金属部材１は、大径部１１と、小径部１２を備えた中実の金属部材である。第一金属部材１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アルミニウム合金を主に含んで形成されている。第一アルミニウム合金は、例えば、ＪＩＳＨ５３０２ＡＤＣ１２（Ａｌ-Ｓｉ-Ｃｕ系）等のアルミニウム合金鋳造材を用いている。 The preparation step is a step of preparing the first metal member 1 and the second metal member 2 provided with the tilting table 50. As shown in FIG. 3, the first metal member 1 is a solid metal member having a large diameter portion 11 and a small diameter portion 12. The first metal member 1 is not particularly limited as long as it is a metal capable of friction stir welding, but in the present embodiment, it is formed mainly containing a first aluminum alloy. As the first aluminum alloy, for example, an aluminum alloy casting material such as JISH5302 ADC12 (Al—Si—Cu system) is used.

大径部１１は、円柱状を呈する。小径部１２は、円柱状を呈し、大径部１１の先端側に同心で形成されている。大径部１１と小径部１２とで段差部１３が形成されている。段差部１３は、段差傾斜面１３ａと、段差側面１３ｂとで構成されている。段差傾斜面１３ａは、大径部１１の先端側の端面に設けられている。段差側面１３ｂは、小径部１２の外周面である。段差側面１３ｂは、段差傾斜面１３ａから小径部１２の先端方向に向けて立ち上がって形成されている。段差傾斜面１３ａは、段差側面１３ｂと接する内周部から、大径部１１の外周面１１ｂと接する外周部へと、径外方向に向かうにつれて段差側面１３ｂから離間する方向に傾斜している。図４に示すように、第一金属部材１の中心軸を通過する断面から見たときに、段差傾斜面１３ａは、第一金属部材１の中心軸と直交する面に対して、傾斜角度βをもって傾斜している。第一金属部材１と第二金属部材２とが突き合わされた際に、段差傾斜面１３ａは、径外方向に向かうにつれて第二金属部材２から離間する方向に傾斜している。段差傾斜面１３ａの傾斜角度βは、攪拌ピンＦ２の傾斜角度α（図１参照）と同一になっている。段差側面１３ｂは、小径部１２の端面１２ａに対して垂直になっている。つまり、段差側面１３ｂは、第一金属部材１の軸方向と平行になっている。 The large diameter portion 11 has a columnar shape. The small diameter portion 12 has a columnar shape and is concentrically formed on the tip end side of the large diameter portion 11. A step portion 13 is formed by the large diameter portion 11 and the small diameter portion 12. The step portion 13 is composed of a step inclined surface 13a and a step side surface 13b. The step inclined surface 13a is provided on the end surface on the tip end side of the large diameter portion 11. The step side surface 13b is an outer peripheral surface of the small diameter portion 12. The step side surface 13b is formed so as to rise from the step inclined surface 13a toward the tip of the small diameter portion 12. The step inclined surface 13a is inclined from the inner peripheral portion in contact with the step side surface 13b to the outer peripheral portion in contact with the outer peripheral surface 11b of the large diameter portion 11 in a direction away from the step side surface 13b in the outward direction. As shown in FIG. 4, when viewed from a cross section passing through the central axis of the first metal member 1, the step inclined surface 13a has an inclination angle β with respect to a surface orthogonal to the central axis of the first metal member 1. Is tilted with. When the first metal member 1 and the second metal member 2 are abutted against each other, the step inclined surface 13a is inclined in a direction away from the second metal member 2 as it goes in the out-diameter direction. The inclination angle β of the step inclined surface 13a is the same as the inclination angle α (see FIG. 1) of the stirring pin F2. The step side surface 13b is perpendicular to the end surface 12a of the small diameter portion 12. That is, the step side surface 13b is parallel to the axial direction of the first metal member 1.

第二金属部材２は、円筒状を呈する金属部材である。第二金属部材２は、小径部１２と略同等の内径を有するとともに、大径部１１の外径よりも大きい外径を有する。第二金属部材２は、展伸材からなることが好ましい。摩擦攪拌可能な金属であれば特に制限されないが、本実施形態では第二アルミニウム合金を主に含んで形成されている。第二アルミニウム合金は、第一アルミニウム合金よりも硬度の低い材料である。第二アルミニウム合金は、例えば、ＪＩＳＡ１０５０，Ａ１１００，Ａ６０６３等のアルミニウム合金展伸材で形成されている。第二金属部材２の端面２１ａは、外周面２１ｂ及び内周面２１ｃに対して垂直になっている。第一金属部材１の外径と第二金属部材２の外径は同一でもよいが、本実施形態では、第二金属部材２の外径を第一金属部材１の外径よりも大きく形成している。また、第二金属部材２の内周面２１ｃの内径は、第一金属部材１の小径部１２の外径と同一又は略同一になっている。なお、本明細書において硬度はブリネル硬さをいい、ＪＩＳＺ２２４３に準じた方法によって測定することができる。 The second metal member 2 is a metal member having a cylindrical shape. The second metal member 2 has an inner diameter substantially equal to that of the small diameter portion 12, and has an outer diameter larger than the outer diameter of the large diameter portion 11. The second metal member 2 is preferably made of a wrought material. The metal is not particularly limited as long as it can be agitated by friction, but in the present embodiment, it is formed mainly containing a second aluminum alloy. The second aluminum alloy is a material having a lower hardness than the first aluminum alloy. The second aluminum alloy is formed of, for example, an aluminum alloy wrought material such as JIS A1050, A1100, A6063. The end surface 21a of the second metal member 2 is perpendicular to the outer peripheral surface 21b and the inner peripheral surface 21c. The outer diameter of the first metal member 1 and the outer diameter of the second metal member 2 may be the same, but in the present embodiment, the outer diameter of the second metal member 2 is formed to be larger than the outer diameter of the first metal member 1. ing. Further, the inner diameter of the inner peripheral surface 21c of the second metal member 2 is the same as or substantially the same as the outer diameter of the small diameter portion 12 of the first metal member 1. In the present specification, the hardness refers to Brinell hardness, which can be measured by a method according to JIS Z 2243.

図３、図４に示すように、第一金属部材１の大径部１１の外周面１１ｂにおける大径部１１と小径部１２との境に近接する位置には、傾斜台５０が形成されている。傾斜台５０は、傾斜台側面５０ａ、傾斜台側面５０ｂと、傾斜面５０ｃ、背面５０ｄとで構成されている。傾斜台側面５０ａ，５０ｂは、互いに対向し外周面１１ｂから略垂直に立ち上がっている。傾斜面５０ｃは、例えば平面視矩形状を呈し、大径部１１と小径部１２との境から遠ざかるにつれて上方（外周面１１ｂから離間する方向）に傾斜している。傾斜面５０ｃは、第一金属部材１の中心軸と平行に配置されている。背面５０ｄは、外周面１１ｂから垂直に立ち上がり、傾斜台側面５０ａ，５０ｂに対してそれぞれ垂直になっている。傾斜台５０は、後記する本接合工程で突合せ部Ｊ１を摩擦攪拌接合する際に、回転ツールＦと干渉しないように設置することが好ましい。傾斜台５０は、回転ツールＦを傾斜面５０ｃに沿って上昇させて後記する終了位置ＥＰ１まで移動させた場合に、第一金属部材１に回転ツールＦによる引抜き穴及び引抜き痕が残らない程度の厚さ（高さ）を有することが好ましい。すなわち、傾斜台５０は、傾斜面５０ｃの下端から上端に向かうにつれて厚みが増していくが、少なくとも攪拌ピンＦ２が傾斜台５０に挿入される深さよりも厚みを有する部位を持つ形状であることが好ましい。 As shown in FIGS. 3 and 4, an inclined table 50 is formed at a position close to the boundary between the large diameter portion 11 and the small diameter portion 12 on the outer peripheral surface 11b of the large diameter portion 11 of the first metal member 1. There is. The inclined table 50 is composed of an inclined table side surface 50a, an inclined table side surface 50b, an inclined surface 50c, and a back surface 50d. The inclined table side surfaces 50a and 50b face each other and rise substantially vertically from the outer peripheral surface 11b. The inclined surface 50c has, for example, a rectangular shape in a plan view, and is inclined upward (in a direction away from the outer peripheral surface 11b) as the distance from the boundary between the large diameter portion 11 and the small diameter portion 12 increases. The inclined surface 50c is arranged parallel to the central axis of the first metal member 1. The back surface 50d rises vertically from the outer peripheral surface 11b and is perpendicular to the inclined table side surfaces 50a and 50b, respectively. It is preferable that the tilting table 50 is installed so as not to interfere with the rotating tool F when the butt portion J1 is friction-stir-welded in the main joining step described later. When the rotating tool F is raised along the inclined surface 50c and moved to the end position EP1 described later, the tilting table 50 does not leave a pull-out hole or a pull-out mark by the rotary tool F on the first metal member 1. It is preferable to have a thickness (height). That is, the inclined table 50 has a shape in which the thickness increases from the lower end to the upper end of the inclined surface 50c, but at least the stirring pin F2 has a portion thicker than the depth inserted into the inclined table 50. preferable.

なお、傾斜面５０ｃの平面視形状は様々な形状にすることができる。また、傾斜台５０は、様々な手段によって第一金属部材１に形成することができる。例えば、第一金属部材１と傾斜台５０とをダイキャスト製法等によって一体成形してもよいし、傾斜台５０を第一金属部材１に後付けで接合するようにしてもよい。 The plan view shape of the inclined surface 50c can be various. Further, the tilting table 50 can be formed on the first metal member 1 by various means. For example, the first metal member 1 and the tilting table 50 may be integrally molded by a die casting method or the like, or the tilting table 50 may be retrofitted to the first metal member 1.

突合せ工程は、図４に示すように、第一金属部材１の傾斜台５０側の先端部と、第二金属部材２の端部とを突き合わせる工程である。突合せ工程では、第一金属部材１の小径部１２を、第二金属部材２の開口部２２に挿入する。これにより、第一金属部材１の段差傾斜面１３ａと、第二金属部材２の端面２１ａとが突き合わされて突合せ部Ｊ１が形成される。突合せ部Ｊ１には、周方向にわたって断面Ｖ字状の隙間が形成される。また、第一金属部材１の段差側面１３ｂと、第二金属部材２の内周面２１ｃとが重ね合わされて突合せ部Ｊ２が形成される。 As shown in FIG. 4, the butt step is a step of butting the tip end portion of the first metal member 1 on the inclined table 50 side and the end portion of the second metal member 2. In the butt step, the small diameter portion 12 of the first metal member 1 is inserted into the opening 22 of the second metal member 2. As a result, the stepped inclined surface 13a of the first metal member 1 and the end surface 21a of the second metal member 2 are abutted to form the butt portion J1. A gap having a V-shaped cross section is formed in the butt portion J1 over the circumferential direction. Further, the stepped side surface 13b of the first metal member 1 and the inner peripheral surface 21c of the second metal member 2 are overlapped to form the butt portion J2.

図５に示すように、第二金属部材２の外周面２１ｂには、設定移動ルートＬ１を設定する。設定移動ルートＬ１は、突合せ部Ｊ１よりも第二金属部材２側に設定されており、突合せ部Ｊ１と平行になっている。設定移動ルートＬ１は、後記する本接合工程において、突合せ部Ｊ１を接合するために必要な回転ツールＦの移動ルートである。設定移動ルートＬ１については追って詳述する。 As shown in FIG. 5, a set movement route L1 is set on the outer peripheral surface 21b of the second metal member 2. The set movement route L1 is set closer to the second metal member 2 than the butt portion J1 and is parallel to the butt portion J1. The set movement route L1 is a movement route of the rotation tool F necessary for joining the butt portion J1 in the main joining step described later. The set movement route L1 will be described in detail later.

本接合工程は、図２、図６及び図７に示すように、回転ツールＦを用いて突合せ部Ｊ１を摩擦攪拌接合する工程である。本接合工程では、回転ツールＦを固定して、被接合金属部材Ｈを周方向に回転させてもよいし、被接合金属部材Ｈを固定して被接合金属部材Ｈの周りに回転ツールＦを移動させてもよい。 As shown in FIGS. 2, 6 and 7, this joining step is a step of friction stir welding the butt portion J1 using the rotary tool F. In this joining step, the rotation tool F may be fixed and the metal member H to be joined may be rotated in the circumferential direction, or the metal member H to be joined may be fixed and the rotation tool F may be placed around the metal member H to be joined. You may move it.

図６に示すように、本接合工程では、第二金属部材２の外周面２１ｂに設定された開始位置ＳＰ１から中間点Ｓ１までの押入区間と、設定移動ルートＬ１上の中間点Ｓ１から一周廻って中間点Ｓ２までの本区間と、中間点Ｓ２から傾斜台５０の傾斜面５０ｃの上部に位置する終了位置ＥＰ１までの離脱区間の三つの区間を連続して摩擦攪拌接合する。中間点Ｓ１，Ｓ２は、設定移動ルートＬ１上に設定されている。開始位置ＳＰ１は、第二金属部材２の外周面２１ｂにおいて、設定移動ルートＬ１よりも第一金属部材１から離間する側に設定されている。本実施形態では、開始位置ＳＰ１と中間点Ｓ１とを結ぶ線分と、設定移動ルートＬ１とのなす角度が鈍角となる位置に設定している。 As shown in FIG. 6, in the main joining step, the intrusion section from the start position SP1 set on the outer peripheral surface 21b of the second metal member 2 to the intermediate point S1 and the intrusion section from the intermediate point S1 on the set movement route L1 go around once. The three sections of the main section up to the intermediate point S2 and the detachment section from the intermediate point S2 to the end position EP1 located above the inclined surface 50c of the inclined table 50 are continuously friction-stir welded. The intermediate points S1 and S2 are set on the set movement route L1. The start position SP1 is set on the outer peripheral surface 21b of the second metal member 2 on the side away from the first metal member 1 with respect to the set movement route L1. In the present embodiment, the angle formed by the line segment connecting the start position SP1 and the intermediate point S1 and the set movement route L1 is set to an obtuse angle.

本接合工程の押入区間では、図６及び図７に示すように、開始位置ＳＰ１から中間点Ｓ１までの摩擦攪拌を行う。押入区間では、外周面２１ｂに対して回転中心軸Ｚを垂直にしつつ、右回転させた攪拌ピンＦ２を開始位置ＳＰ１に挿入し、中間点Ｓ１まで移動させる。つまり、回転ツールＦが相対移動する間、回転中心軸Ｚが第二金属部材２の外周面２１ｂの法線と重なるように設定する。この際、図６に示すように、少なくとも中間点Ｓ１に到達するまでに予め設定された「所定の深さ」に達するように攪拌ピンＦ２を徐々に押し入れていく。つまり、回転ツールＦを一ヶ所に留まらせることなく、回転ツールＦを設定移動ルートＬ１に移動させながら徐々に下降させていく。ここで、「所定の深さ」とは、設定移動ルートＬ１上の中間点Ｓ１から一周廻って中間点Ｓ２までの本区間において、攪拌ピンＦ２を押し入れる深さをいう。本実施形態では、攪拌ピンＦ２の先端である平坦面Ｆ３が段差側面１３ｂに達して、段差側面１３ｂを突き抜けるように「所定の深さ」を設定している。 In the closet section of this joining step, as shown in FIGS. 6 and 7, friction stir welding is performed from the start position SP1 to the intermediate point S1. In the intrusion section, the stirring pin F2 rotated clockwise is inserted into the start position SP1 while the rotation center axis Z is perpendicular to the outer peripheral surface 21b, and is moved to the intermediate point S1. That is, the rotation center axis Z is set so as to overlap the normal line of the outer peripheral surface 21b of the second metal member 2 while the rotation tool F moves relative to each other. At this time, as shown in FIG. 6, the stirring pin F2 is gradually pushed in so as to reach a preset "predetermined depth" by at least reaching the intermediate point S1. That is, instead of keeping the rotation tool F in one place, the rotation tool F is gradually lowered while being moved to the set movement route L1. Here, the "predetermined depth" refers to the depth at which the stirring pin F2 is pushed in in this section from the intermediate point S1 on the set movement route L1 to the intermediate point S2. In the present embodiment, the "predetermined depth" is set so that the flat surface F3, which is the tip of the stirring pin F2, reaches the step side surface 13b and penetrates the step side surface 13b.

また、中間点Ｓ１に達した際に、攪拌ピンＦ２の外周面と第一金属部材１の段差傾斜面１３ａとがわずかに接触するように設定する。このとき、少なくとも攪拌ピンＦ２と第一金属部材１との接触により第一金属部材１側の第一アルミニウム合金がわずかに削り取られ、第一金属部材１側からの第一アルミニウム合金が塑性流動材として第二金属部材２側に混入する。さらに、攪拌ピンＦ２の平坦面Ｆ３が段差側面１３ｂを突き抜けるように設定する。 Further, when the intermediate point S1 is reached, the outer peripheral surface of the stirring pin F2 and the stepped inclined surface 13a of the first metal member 1 are set to slightly contact each other. At this time, at least the first aluminum alloy on the first metal member 1 side is slightly scraped off by the contact between the stirring pin F2 and the first metal member 1, and the first aluminum alloy from the first metal member 1 side is a plastic fluid material. Is mixed into the second metal member 2 side. Further, the flat surface F3 of the stirring pin F2 is set so as to penetrate the step side surface 13b.

攪拌ピンＦ２の外周面と第一金属部材１の段差傾斜面１３ａとの接触代（オフセット量）Ｎは、例えば、０＜Ｎ≦１．０ｍｍの間で設定し、好ましくは０＜Ｎ≦０．８５ｍｍの間で設定し、より好ましくは０＜Ｎ≦０．６５ｍｍの間で設定する。設定移動ルートＬ１は、図７に示すように、攪拌ピンＦ２の平坦面Ｆ３の中心が通過する軌跡を示している。つまり、設定移動ルートＬ１は、突合せ部Ｊ１の周方向において、第一金属部材１の段差傾斜面１３ａと攪拌ピンＦ２の外周面とを平行にしつつ両者がわずかに接触するように設定されている。 The contact allowance (offset amount) N between the outer peripheral surface of the stirring pin F2 and the stepped inclined surface 13a of the first metal member 1 is set, for example, between 0 <N ≦ 1.0 mm, and preferably 0 <N ≦ 0. It is set between .85 mm, and more preferably between 0 <N ≦ 0.65 mm. As shown in FIG. 7, the set movement route L1 shows a locus through which the center of the flat surface F3 of the stirring pin F2 passes. That is, the set movement route L1 is set so that the stepped inclined surface 13a of the first metal member 1 and the outer peripheral surface of the stirring pin F2 are made parallel to each other and slightly contact each other in the circumferential direction of the butt portion J1. ..

本区間においては、上方から見た場合（外周面２１ｂ側から見た場合）に、平坦面Ｆ３の中心が、設定移動ルートＬ１と重なるように回転ツールＦを相対移動させる。本区間においては、第二金属部材２の第二アルミニウム合金を突合せ部Ｊ１の隙間に流入させながら摩擦攪拌接合を行う。攪拌ピンＦ２の外周面と段差傾斜面１３ａとが接触しないように設定すると、突合せ部Ｊ１の接合強度が低くなる。一方、攪拌ピンＦ２の外周面と段差傾斜面１３ａとの接触代Ｎが１．０ｍｍを超えると第一金属部材１の第一アルミニウム合金が、第二金属部材２側に大量に混入して接合不良となるおそれがある。また、攪拌ピンＦ２のみを第一金属部材１及び第二金属部材２に接触させ、攪拌ピンＦ２の基端側を露出した状態で相対移動させる。 In this section, when viewed from above (when viewed from the outer peripheral surface 21b side), the rotation tool F is relatively moved so that the center of the flat surface F3 overlaps with the set movement route L1. In this section, friction stir welding is performed while the second aluminum alloy of the second metal member 2 is allowed to flow into the gap of the butt portion J1. If the outer peripheral surface of the stirring pin F2 and the stepped inclined surface 13a are set so as not to come into contact with each other, the joint strength of the butt portion J1 becomes low. On the other hand, when the contact allowance N between the outer peripheral surface of the stirring pin F2 and the stepped inclined surface 13a exceeds 1.0 mm, a large amount of the first aluminum alloy of the first metal member 1 is mixed and joined to the second metal member 2 side. It may be defective. Further, only the stirring pin F2 is brought into contact with the first metal member 1 and the second metal member 2, and the stirring pin F2 is relatively moved in a state where the base end side is exposed.

本区間では、図２、図７に示すように、回転ツールＦを一周させて攪拌ピンＦ２が中間点Ｓ２に到達したら、そのまま離脱区間に移行する。 In this section, as shown in FIGS. 2 and 7, when the rotating tool F goes around and the stirring pin F2 reaches the intermediate point S2, the section shifts to the leaving section as it is.

図８は、第一実施形態に係る摩擦攪拌接合方法の本接合工程を示す断面図である。離脱区間では、中間点Ｓ２から終了位置ＥＰ１に向かうまでの間に攪拌ピンＦ２を徐々に上方に移動させて（図８）、終了位置ＥＰ１で第二金属部材２から攪拌ピンＦ２を離脱させる（図２）。つまり、回転ツールＦを一ヶ所に留まらせることなく、回転ツールＦを終了位置ＥＰ１に移動させながら第二金属部材２から離間する方向に徐々に引抜いていく。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。 FIG. 8 is a cross-sectional view showing a main joining step of the friction stir welding method according to the first embodiment. In the detachment section, the stirring pin F2 is gradually moved upward from the intermediate point S2 toward the end position EP1 (FIG. 8), and the stirring pin F2 is detached from the second metal member 2 at the end position EP1 (FIG. 8). Figure 2). That is, without keeping the rotation tool F in one place, the rotation tool F is gradually pulled out in the direction away from the second metal member 2 while moving to the end position EP1. A plasticized region W is formed in the movement locus of the rotation tool F.

傾斜台除去工程は、傾斜台５０を除去する工程である。傾斜台除去工程では、例えば、切削加工により外周面１１ｂを基準として傾斜台５０をすべて除去する。 The tilting table removing step is a step of removing the tilting table 50. In the inclined table removing step, for example, all the inclined table 50 is removed with reference to the outer peripheral surface 11b by cutting.

以上説明した本実施形態における摩擦攪拌接合方法によれば、回転ツールＦの終了位置ＥＰ１を傾斜台５０に設定するとともに、当該傾斜台５０を切除する。これにより、第一金属部材１、第二金属部材２に引抜き穴及び引抜き痕が残存しない摩擦攪拌接合が可能となる。また、これにより第一金属部材１の外周面１１ｂには引抜き穴及び引抜き痕が残存しないため、きれいに仕上げることができる。 According to the friction stir welding method in the present embodiment described above, the end position EP1 of the rotation tool F is set to the inclined table 50, and the inclined table 50 is cut off. This enables friction stir welding in which the first metal member 1 and the second metal member 2 do not have a pull-out hole or a pull-out mark. Further, as a result, no drawing holes and drawing marks remain on the outer peripheral surface 11b of the first metal member 1, so that a clean finish can be achieved.

また、回転ツールＦは傾斜台５０の傾斜面５０ｃに沿って上昇させるため、終了位置ＥＰ１まで回転ツールＦを移動させると、攪拌ピンＦ２と外周面１１ｂとを離間させることができる。これにより、回転ツールＦを離脱させた際に生じる引抜き穴は、外周面１１ｂには残存せず、傾斜台５０のみに残存させることができる。
また、本実施形態の第一金属部材１を、例えば、ダイキャストで一体成形することにより、傾斜台５０を容易に成形することができる。また、傾斜台５０の傾斜面５０ｃに沿って一定の挿入深さで上昇させればよいため、回転ツールＦの回転速度を変更するなどの煩雑な作業を省略することができる。 Further, since the rotating tool F is raised along the inclined surface 50c of the inclined table 50, when the rotating tool F is moved to the end position EP1, the stirring pin F2 and the outer peripheral surface 11b can be separated from each other. As a result, the pull-out hole generated when the rotary tool F is detached does not remain on the outer peripheral surface 11b, but can be left only on the inclined table 50.
Further, the tilting table 50 can be easily formed by integrally molding the first metal member 1 of the present embodiment, for example, by die casting. Further, since it is sufficient to raise the tilting table 50 along the inclined surface 50c at a constant insertion depth, complicated work such as changing the rotation speed of the rotation tool F can be omitted.

また、第二金属部材２と攪拌ピンＦ２との摩擦熱によって突合せ部Ｊ１の主として第二金属部材２側の第二アルミニウム合金が攪拌されて塑性流動化され、突合せ部Ｊ１において第一金属部材１の段差傾斜面１３ａと、第二金属部材２の端面２１ａとを接合することができる。 Further, the second aluminum alloy mainly on the second metal member 2 side of the butt portion J1 is agitated and plastically fluidized by the frictional heat between the second metal member 2 and the stirring pin F2, and the first metal member 1 is formed in the butt portion J1. The stepped inclined surface 13a and the end surface 21a of the second metal member 2 can be joined.

また、攪拌ピンＦ２の外周面を第一金属部材１の段差傾斜面１３ａにわずかに接触させるに留めるため、第一金属部材１から第二金属部材２への第一アルミニウム合金の混入を極力少なくすることができる。これにより、突合せ部Ｊ１においては主として第二金属部材２側の第二アルミニウム合金が摩擦攪拌されるため、接合強度の低下を抑制することができる。つまり、本接合工程では、攪拌ピンＦ２の回転中心軸Ｚに対して一方側と他方側で、攪拌ピンＦ２が受ける材料抵抗の不均衡を極力少なくすることができる。これにより、塑性流動材がバランス良く摩擦攪拌されるため、接合強度の低下を抑制することができる。また、回転ツールＦにかかる負荷を軽減することができるため、回転ツールＦに大きな負荷がかからない状態で、突合せ部Ｊ１を接合することができる。 Further, in order to keep the outer peripheral surface of the stirring pin F2 slightly in contact with the stepped inclined surface 13a of the first metal member 1, the mixing of the first aluminum alloy from the first metal member 1 to the second metal member 2 is minimized. can do. As a result, in the butt portion J1, the second aluminum alloy on the second metal member 2 side is mainly frictionally agitated, so that a decrease in joint strength can be suppressed. That is, in this joining step, the imbalance of the material resistance received by the stirring pin F2 on one side and the other side with respect to the rotation center axis Z of the stirring pin F2 can be minimized. As a result, the plastic fluid material is frictionally agitated in a well-balanced manner, so that a decrease in joint strength can be suppressed. Further, since the load applied to the rotation tool F can be reduced, the butt portion J1 can be joined without applying a large load to the rotation tool F.

また、本接合工程において、攪拌ピンＦ２の外周面と第一金属部材１の段差傾斜面１３ａとが平行となるように回転ツールＦの位置を設定することで、攪拌ピンＦ２と第一金属部材１とをバランスよく接触させることができる。また、第二金属部材２の外径を、第一金属部材１の外径よりも大きく設定することにより、接合部が金属不足になるのを防ぐことができる。また、攪拌ピンＦ２の先端を、第一金属部材１の段差側面１３ｂに達するように設定することで、突合せ部Ｊ２も確実に摩擦攪拌できるため、接合強度を高めることができる。 Further, in this joining step, the stirring pin F2 and the first metal member are set by setting the position of the rotating tool F so that the outer peripheral surface of the stirring pin F2 and the stepped inclined surface 13a of the first metal member 1 are parallel to each other. Can be brought into contact with 1 in a well-balanced manner. Further, by setting the outer diameter of the second metal member 2 to be larger than the outer diameter of the first metal member 1, it is possible to prevent the joint portion from becoming short of metal. Further, by setting the tip of the stirring pin F2 so as to reach the step side surface 13b of the first metal member 1, the butt portion J2 can also be reliably frictionally stirred, so that the joining strength can be increased.

ここで、攪拌ピンＦ２を設定移動ルートＬ１に挿入する際、設定移動ルートＬ１上に摩擦攪拌の開始位置を設定して所定の深さとなるまで鉛直方向に攪拌ピンＦ２を押入すると、開始位置における摩擦熱が過大となる。これにより、当該開始位置において、第一金属部材１側の金属が第二金属部材２側に混入しやすくなり、接合不良の一因となるという問題がある。
これに対し、本実施形態の本接合工程の押入区間では、開始位置ＳＰ１から設定移動ルートＬ１と重複する位置まで回転ツールＦを移動させつつ所定の深さとなるまで攪拌ピンＦ２を徐々に押入することにより、設定移動ルートＬ１上で回転ツールＦが停止して摩擦熱が局所的に過大になるのを防ぐことができる。 Here, when the stirring pin F2 is inserted into the set movement route L1, the start position of friction stir is set on the set movement route L1 and the stirring pin F2 is pushed in the vertical direction until the depth reaches a predetermined depth. Friction heat becomes excessive. As a result, at the start position, the metal on the first metal member 1 side is likely to be mixed on the second metal member 2 side, which causes a problem of contributing to poor joining.
On the other hand, in the push-in section of the main joining step of the present embodiment, the stirring pin F2 is gradually pushed in until it reaches a predetermined depth while moving the rotation tool F from the start position SP1 to a position overlapping the set movement route L1. This makes it possible to prevent the rotation tool F from stopping on the set movement route L1 and causing the frictional heat to be locally excessive.

同様に、本接合工程の離脱区間では、設定移動ルートＬ１から終了位置ＥＰ１まで回転ツールＦを移動させつつ所定の深さから攪拌ピンＦ２を徐々に引き抜いて離脱させることにより、設定移動ルートＬ１上で回転ツールＦの移動が停止して摩擦熱が局所的に過大になるのを防ぐことができる。これらにより、設定移動ルートＬ１上で摩擦熱が過大となり、第一金属部材１から第二金属部材２へ第一アルミニウム合金が過剰に混入して接合不良となるのを防ぐことができる。 Similarly, in the disengagement section of the main joining step, the stirring pin F2 is gradually pulled out from a predetermined depth while moving the rotation tool F from the set movement route L1 to the end position EP1 to disengage the stirring pin F2 on the set movement route L1. It is possible to prevent the rotation tool F from stopping and the frictional heat from becoming excessive locally. As a result, it is possible to prevent the frictional heat from becoming excessive on the set movement route L1 and excessive mixing of the first aluminum alloy from the first metal member 1 to the second metal member 2 resulting in poor joining.

また、本接合工程において、開始位置ＳＰ１及び終了位置ＥＰ１の位置は適宜設定すればよい（終了位置ＥＰ１の位置は傾斜台５０の設置位置を選択することで適宜設定できる）。開始位置ＳＰ１と設定移動ルートＬ１とのなす角度、終了位置ＥＰ１と設定移動ルートＬ１とのなす角度が鈍角となるように設定することにより、中間点Ｓ１，Ｓ２で回転ツールＦの移動速度が低下することなくスムーズに本区間又は離脱区間に移行することができる。これにより、設定移動ルートＬ１上で回転ツールＦが停止又は移動速度が低下することにより、摩擦熱が過大となることを防ぐことができる。なお、上方から見て回転ツールＦの軌跡が円弧を描くように開始位置ＳＰ１から設定移動ルートＬ１に回転ツールＦを移動させてもよい。同様に、上方から見て回転ツールＦの軌跡が円弧を描くように設定移動ルートＬ１から終了位置ＥＰ１に回転ツールＦを移動させてもよい。 Further, in this joining step, the positions of the start position SP1 and the end position EP1 may be appropriately set (the position of the end position EP1 can be appropriately set by selecting the installation position of the inclined table 50). By setting the angle between the start position SP1 and the set movement route L1 and the angle between the end position EP1 and the set movement route L1 to be obtuse, the movement speed of the rotation tool F decreases at the intermediate points S1 and S2. It is possible to smoothly shift to this section or the departure section without doing so. As a result, it is possible to prevent the frictional heat from becoming excessive due to the rotation tool F stopping or the moving speed decreasing on the set movement route L1. The rotation tool F may be moved from the start position SP1 to the set movement route L1 so that the locus of the rotation tool F draws an arc when viewed from above. Similarly, the rotation tool F may be moved from the set movement route L1 to the end position EP1 so that the locus of the rotation tool F draws an arc when viewed from above.

また、本接合工程では、回転ツールＦの回転方向及び進行方向は適宜設定すればよいが、本実施形態では回転ツールＦの移動軌跡に形成される塑性化領域Ｗのうち、第一金属部材１（突合せ部Ｊ１側）がシアー側となり、第二金属部材２側がフロー側となるように回転ツールＦの回転方向及び進行方向を設定した。第一金属部材１側がシアー側となるように設定することで、突合せ部Ｊ１の周囲における攪拌ピンＦ２による攪拌作用が高まり、突合せ部Ｊ１における温度上昇が期待でき、突合せ部Ｊ１において第一金属部材１の段差傾斜面１３ａと、第二金属部材２の端面２１ａとをより確実に接合することができる。 Further, in the present joining step, the rotation direction and the traveling direction of the rotation tool F may be appropriately set, but in the present embodiment, the first metal member 1 of the plasticized region W formed in the movement locus of the rotation tool F 1 The rotation direction and the traveling direction of the rotation tool F are set so that (butting portion J1 side) is on the shear side and the second metal member 2 side is on the flow side. By setting the first metal member 1 side to be the shear side, the stirring action by the stirring pin F2 around the butt portion J1 is enhanced, the temperature rise in the butt portion J1 can be expected, and the first metal member in the butt portion J1. The stepped inclined surface 13a of 1 and the end surface 21a of the second metal member 2 can be more reliably joined.

なお、シアー側（Advancing side）とは、被接合部に対する回転ツールの外周の相対速度が、回転ツールの外周における接線速度の大きさに移動速度の大きさを加算した値となる側を意味する。一方、フロー側（Retreating side）とは、回転ツールの移動方向の反対方向に回転ツールが回動することで、被接合部に対する回転ツールの相対速度が低速になる側を言う。 The shear side (Advancing side) means the side where the relative speed of the outer circumference of the rotating tool with respect to the jointed portion is the value obtained by adding the magnitude of the moving speed to the magnitude of the tangential velocity on the outer circumference of the rotating tool. .. On the other hand, the flow side (Retreating side) refers to the side in which the relative speed of the rotating tool with respect to the jointed portion becomes low due to the rotation of the rotating tool in the direction opposite to the moving direction of the rotating tool.

また、第一金属部材１の第一アルミニウム合金は、第二金属部材２の第二アルミニウム合金よりも硬度の高い材料になっている。これにより、第一金属部材１と第二金属部材２とを接合した被接合金属部材の耐久性を高めることができる。また、第一金属部材１の第一アルミニウム合金をアルミニウム合金鋳造材とし、第二金属部材２の第二アルミニウム合金をアルミニウム合金展伸材とすることが好ましい。第一アルミニウム合金を例えば、ＪＩＳＨ５３０２ＡＤＣ１２等のＡｌ−Ｓｉ−Ｃｕ系アルミニウム合金鋳造材とすることにより、第一金属部材１の鋳造性、強度、被削性等を高めることができる。また、第二アルミニウム合金を例えば、ＪＩＳＡ１０００系又はＡ６０００系とすることにより、加工性、熱伝導性を高めることができる。また、本実施形態では、第一金属部材１はダイキャスト材からなり、第二金属部材２は展伸材からなることで、被接合金属部材Ｈを容易に形成することができる。 Further, the first aluminum alloy of the first metal member 1 is a material having a higher hardness than the second aluminum alloy of the second metal member 2. As a result, the durability of the metal member to be joined, which is the joint between the first metal member 1 and the second metal member 2, can be enhanced. Further, it is preferable that the first aluminum alloy of the first metal member 1 is an aluminum alloy casting material and the second aluminum alloy of the second metal member 2 is an aluminum alloy wrought material. By using an Al—Si—Cu based aluminum alloy casting material such as JIS H5302 ADC12 as the first aluminum alloy, the castability, strength, machinability, etc. of the first metal member 1 can be improved. Further, by using, for example, JIS A1000 series or A6000 series as the second aluminum alloy, processability and thermal conductivity can be improved. Further, in the present embodiment, the first metal member 1 is made of a die-cast material and the second metal member 2 is made of a wrought material, so that the metal member H to be joined can be easily formed.

また、本接合工程においては、突合せ部Ｊ１の全周を摩擦攪拌接合するため、被接合金属部材Ｈの気密性及び水密性を高めることができる。また、本接合工程の終端部分において、回転ツールＦが中間点Ｓ１を完全に通過してから終了位置ＥＰ１に向かうようにする。つまり、本接合工程によって形成された塑性化領域Ｗの各端部同士をオーバーラップさせることにより、より気密性及び水密性を高めることができる。 Further, in this joining step, since the entire circumference of the butt portion J1 is friction-stir welded, the airtightness and watertightness of the metal member H to be joined can be improved. Further, at the end portion of the main joining step, the rotation tool F is made to move toward the end position EP1 after completely passing through the intermediate point S1. That is, the airtightness and watertightness can be further improved by overlapping the ends of the plasticized region W formed by this joining step with each other.

なお、本接合工程では、回転ツールＦの回転速度を一定としてもよいが、可変させてもよい。本接合工程の押入区間において、開始位置ＳＰ１における回転ツールＦの回転速度をＶ１とし、本区間における回転ツールＦの回転速度をＶ２とすると、Ｖ１＞Ｖ２としてもよい。回転速度のＶ２は、設定移動ルートＬ１における予め設定された一定の回転速度である。つまり、開始位置ＳＰ１では、回転速度を速く設定しておき、押入区間内で徐々に回転速度を低減させながら本区間に移行してもよい。 In this joining step, the rotation speed of the rotation tool F may be constant, but may be variable. In the indentation section of the main joining step, if the rotation speed of the rotation tool F at the start position SP1 is V1 and the rotation speed of the rotation tool F in this section is V2, V1> V2 may be satisfied. The rotation speed V2 is a preset constant rotation speed in the set movement route L1. That is, at the start position SP1, the rotation speed may be set high, and the rotation speed may be gradually reduced in the closet section to shift to the main section.

また、本接合工程の離脱区間において、本区間における回転ツールＦの回転速度をＶ２、終了位置ＥＰ１において離脱させるときの回転ツールＦの回転速度をＶ３とすると、Ｖ３＞Ｖ２としてもよい。つまり、離脱区間に移行したら、終了位置ＥＰ１に向けて徐々に回転速度を上げながら第二金属部材２から回転ツールＦを離脱させてもよい。回転ツールＦを第二金属部材２に押し入れる際又は第二金属部材２から離脱させる際に、前記のように設定することで、押入区間又は離脱区間時における少ない押圧力を、回転速度で補うことができるため、摩擦攪拌を好適に行うことができる。 Further, in the detachment section of the main joining step, if the rotation speed of the rotation tool F in this section is V2 and the rotation speed of the rotation tool F at the end position EP1 is V3, V3> V2 may be satisfied. That is, after shifting to the detachment section, the rotation tool F may be detached from the second metal member 2 while gradually increasing the rotation speed toward the end position EP1. When the rotary tool F is pushed into the second metal member 2 or separated from the second metal member 2, by setting as described above, the small pressing force in the indentation section or the detachment section is compensated by the rotation speed. Therefore, friction stir welding can be preferably performed.

［第二実施形態］
次に、本発明の第二実施形態に係る摩擦攪拌接合方法について説明する。第二実施形態では、図９に示すように、第二金属部材２の外周面２１ｂ上であって第二金属部材２の端面２１ａに近接する位置に、外周面２１ｂから突出するように傾斜台５０を設けている。そのため、終了位置ＥＰ１も第二金属部材２の外周面２１ｂにおける傾斜台５０となり、本接合工程の離脱区間も第二金属部材２の外周面２１ｂ上となる。これらの点で第二実施形態は第一実施形態と相違する。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。傾斜台５０は、傾斜台側面５０ａと、傾斜台側面５０ｂと、傾斜面５０ｃと、背面５０ｄとで構成されている。傾斜台側面５０ａ，５０ｂは、互いに対向し外周面２１ｂから略垂直に立ち上がっている。傾斜面５０ｃは、例えば平面視矩形状を呈し、端面２１ａから遠ざかるにつれて上方（外周面２１ｂから離間する方向）に傾斜している。傾斜面５０ｃは、第二金属部材２の中心軸と平行に配置されている。背面５０ｄは、外周面２１ｂから垂直に立ち上がり、傾斜台側面５０ａ，５０ｂに対してそれぞれ垂直になっている。傾斜台５０は、後記する本接合工程で突合せ部Ｊ１を摩擦攪拌接合する際に、回転ツールＦと干渉しないように設置することが好ましい。 [Second Embodiment]
Next, the friction stir welding method according to the second embodiment of the present invention will be described. In the second embodiment, as shown in FIG. 9, an inclined table is projected from the outer peripheral surface 21b at a position on the outer peripheral surface 21b of the second metal member 2 and close to the end surface 21a of the second metal member 2. 50 is provided. Therefore, the end position EP1 is also the inclined table 50 on the outer peripheral surface 21b of the second metal member 2, and the detachment section of this joining step is also on the outer peripheral surface 21b of the second metal member 2. In these respects, the second embodiment differs from the first embodiment. In the second embodiment, the parts different from the first embodiment will be mainly described. The inclined table 50 is composed of an inclined table side surface 50a, an inclined table side surface 50b, an inclined surface 50c, and a back surface 50d. The inclined table side surfaces 50a and 50b face each other and rise substantially vertically from the outer peripheral surface 21b. The inclined surface 50c has, for example, a rectangular shape in a plan view, and is inclined upward (in a direction away from the outer peripheral surface 21b) as the distance from the end surface 21a increases. The inclined surface 50c is arranged parallel to the central axis of the second metal member 2. The back surface 50d rises vertically from the outer peripheral surface 21b and is perpendicular to the inclined table side surfaces 50a and 50b, respectively. It is preferable that the tilting table 50 is installed so as not to interfere with the rotating tool F when the butt portion J1 is friction-stir-welded in the main joining step described later.

第二実施形態に係る液冷ジャケットの製造では、準備工程と、突合せ工程と、本接合工程と、傾斜台除去工程とを行う。突合せ工程、傾斜台除去工程は、第一実施形態と同様である。準備工程では、第二金属部材２の外周面２１ｂ上に傾斜台５０を形成する。本接合工程では、離脱区間が第二金属部材２の外周面２１ｂ上だけでほぼ完結することとなる。その他の本接合工程の作業は第一実施形態と同様である。 In the production of the liquid-cooled jacket according to the second embodiment, a preparation step, a butt step, a main joining step, and a tilting table removing step are performed. The butt step and the tilting table removing step are the same as those in the first embodiment. In the preparatory step, the inclined table 50 is formed on the outer peripheral surface 21b of the second metal member 2. In this joining step, the detachment section is almost completed only on the outer peripheral surface 21b of the second metal member 2. The other operations of this joining step are the same as those of the first embodiment.

以上説明した本実施形態における摩擦攪拌接合方法によれば、傾斜台５０を第二金属部材２と同様に第二アルミニウム合金で形成している場合は、第二アルミニウム合金は相対的に硬度が低いので離脱区間での攪拌ピンＦ２の動きがスムーズになり、本接合工程の作業性を向上させることができる。 According to the friction stir welding method in the present embodiment described above, when the inclined table 50 is made of the second aluminum alloy like the second metal member 2, the second aluminum alloy has a relatively low hardness. Therefore, the movement of the stirring pin F2 in the detached section becomes smooth, and the workability of the main joining process can be improved.

同様に、傾斜台５０を第二金属部材２と同様に第二アルミニウム合金で形成している場合は、第二アルミニウム合金は相対的に硬度が低いので、傾斜台除去工程の作業が容易になる。その他、本実施形態においても、第一実施形態と同様の効果を奏することができる。 Similarly, when the tilting table 50 is formed of the second aluminum alloy in the same manner as the second metal member 2, the second aluminum alloy has a relatively low hardness, so that the operation of the tilting table removing step becomes easy. .. In addition, the same effect as that of the first embodiment can be obtained in this embodiment as well.

［変形例］
前記実施形態の変形例について説明する。図１０は、第一変形例に係る摩擦攪拌接合方法の準備工程を示す斜視図である。本変形例が第一実施形態と異なるのは、傾斜台５０の傾斜面５０ｃが上面視円弧状に形成されていることである。 [Modification example]
A modified example of the above embodiment will be described. FIG. 10 is a perspective view showing a preparatory step of the friction stir welding method according to the first modification. This modification is different from the first embodiment in that the inclined surface 50c of the inclined table 50 is formed in an arc shape in a top view.

これにより、本接合工程の離脱区間を摩擦攪拌する際に攪拌ピンＦ２を円弧状に相対移動させることができるので、本区間から離脱区間へ回転ツールＦをスムーズに移動させることができる。なお、この場合の傾斜台５０は、第一金属部材１の外周面１１ｂに形成してもよい。 As a result, the stirring pin F2 can be relatively moved in an arc shape when frictionally stirring the detached section of the main joining step, so that the rotary tool F can be smoothly moved from the present section to the detached section. The tilting table 50 in this case may be formed on the outer peripheral surface 11b of the first metal member 1.

図１１は、第二変形例に係る摩擦攪拌接合方法の本接合工程における押入区間の摩擦攪拌を示す斜視図である。本接合工程では、図１０に示すように、開始位置ＳＰ１を設定移動ルートＬ１上に設定して、押入区間を開始位置ＳＰ１から中間点Ｓ１までとしている。本区間、離脱区間は前記の実施形態と同様である。 FIG. 11 is a perspective view showing friction stir in the closet section in the main joining step of the friction stir welding method according to the second modification. In this joining step, as shown in FIG. 10, the start position SP1 is set on the set movement route L1 and the closet section is set from the start position SP1 to the intermediate point S1. This section and the withdrawal section are the same as those in the above embodiment.

第二変形例によれば、押入区間が本区間と重なるので、全工程完了後に押入区間の塑性化領域Ｗを目立ちにくくすることができる。 According to the second modification, since the closet section overlaps with the main section, the plasticized region W of the closet section can be made inconspicuous after the completion of all the steps.

１第一金属部材
２第二金属部材
１１大径部
１１ｂ外周面
１２小径部
１３ａ段差傾斜面
１３ｂ段差側面
２１ａ端面
２１ｂ外周面
２１ｃ内周面
２２開口部
５０傾斜台
Ｌ１設定移動ルート
Ｆ回転ツール
Ｆ１連結部
Ｆ２攪拌ピン
Ｆ３平坦面
Ｊ１突合せ部
ＳＰ１開始位置
ＥＰ１終了位置
Ｗ塑性化領域 1 1st metal member 2 2nd metal member 11 Large diameter part 11b Outer peripheral surface 12 Small diameter part 13a Step inclined surface 13b Step side surface 21a End surface 21b Outer peripheral surface 21c Inner peripheral surface 22 Opening 50 Inclined table L1 Setting movement route F Rotation tool F1 Connection part F2 Stirring pin F3 Flat surface J1 Butt part SP1 Start position EP1 End position W Plasticization area

Claims

大径部の端部に小径部を備えた柱状の第一金属部材と、前記小径部と略同等の内径を有する筒状の第二金属部材とを端部同士で突き合わせて形成された被接合金属部材の突合せ部に対して、攪拌ピンを備える回転ツールを用いて摩擦攪拌を行う摩擦攪拌接合方法であって、
前記第一金属部材は第一アルミニウム合金で形成されており、前記第二金属部材は第二アルミニウム合金で形成されており、前記第一アルミニウム合金は前記第二アルミニウム合金よりも硬度が高い材種であり、
前記攪拌ピンは先細りとなっており、
前記第一金属部材の前記大径部と前記小径部との境に近接するとともに前記第一金属部材の外周面から突出する傾斜台を形成する準備工程と、
前記第二金属部材の開口部に前記第一金属部材の前記小径部を挿入することにより、前記第二金属部材の内周面と前記第一金属部材の段差側面とを重ね合わせるとともに、前記第二金属部材の端面と前記第一金属部材の段差傾斜面とを突き合わせて前記突合せ部に断面Ｖ字状の隙間を形成する突合せ工程と、
回転する前記回転ツールの前記攪拌ピンを前記第二金属部材の外周面に挿入し、前記攪拌ピンの外周面を前記第一金属部材の前記段差傾斜面にわずかに接触させた状態で、前記隙間に前記第二アルミニウム合金を流入させながら、前記突合せ部よりも前記第二金属部材側に設定された設定移動ルートに沿って所定の深さで前記第二金属部材の外周面の廻りに一周させて前記突合せ部に摩擦攪拌を行った後、前記攪拌ピンを前記傾斜台の傾斜面に沿って昇るように移動させて当該傾斜面の上側で引抜く本接合工程と、
前記傾斜台を除去する傾斜台除去工程と、を含むことを特徴とする摩擦攪拌接合方法。 A columnar first metal member having a small diameter portion at the end of a large diameter portion and a tubular second metal member having an inner diameter substantially equal to that of the small diameter portion are abutted against each other to be joined. A friction stir welding method in which friction stir welding is performed on a butt portion of a metal member using a rotary tool equipped with a stirring pin.
The first metal member is formed of a first aluminum alloy, the second metal member is formed of a second aluminum alloy, and the first aluminum alloy is a grade having a higher hardness than the second aluminum alloy. And
The stirring pin is tapered and
A preparatory step of forming an inclined table that is close to the boundary between the large-diameter portion and the small-diameter portion of the first metal member and protrudes from the outer peripheral surface of the first metal member.
By inserting the small diameter portion of the first metal member into the opening of the second metal member, the inner peripheral surface of the second metal member and the stepped side surface of the first metal member are overlapped, and the first (Ii) A butt step of abutting the end face of the metal member and the stepped inclined surface of the first metal member to form a gap having a V-shaped cross section in the butt portion.
The gap is formed by inserting the stirring pin of the rotating tool into the outer peripheral surface of the second metal member and slightly contacting the outer peripheral surface of the stirring pin with the stepped inclined surface of the first metal member. While flowing the second aluminum alloy into the butt, the second metal member is made to go around the outer peripheral surface of the second metal member at a predetermined depth along a set movement route set on the second metal member side of the butt portion. After performing friction stir welding on the butt portion, the stirring pin is moved so as to rise along the inclined surface of the inclined table and pulled out on the upper side of the inclined surface.
A friction stir welding method comprising a tilting table removing step of removing the tilting table.

大径部の端部に小径部を備えた柱状の第一金属部材と、前記小径部と略同等の内径を有する筒状の第二金属部材とを端部同士で突き合わせて形成された被接合金属部材の突合せ部に対して、攪拌ピンを備える回転ツールを用いて摩擦攪拌を行う摩擦攪拌接合方法であって、
前記第一金属部材は第一アルミニウム合金で形成されており、前記第二金属部材は第二アルミニウム合金で形成されており、前記第一アルミニウム合金は前記第二アルミニウム合金よりも硬度が高い材種であり、
前記攪拌ピンは先細りとなっており、
前記第二金属部材の端面に近接するとともに前記第二金属部材の外周面から突出する傾斜台を形成する準備工程と、
前記第二金属部材の前記傾斜台側の開口部に前記第一金属部材の前記小径部を挿入することにより、前記第二金属部材の内周面と前記第一金属部材の段差側面とを重ね合わせるとともに、前記第二金属部材の端面と前記第一金属部材の段差傾斜面とを突き合わせて突合せ部に断面Ｖ字状の隙間を形成する突合せ工程と、
回転する前記回転ツールの前記攪拌ピンを前記第二金属部材の外周面に挿入し、前記攪拌ピンの外周面を前記第一金属部材の前記段差傾斜面にわずかに接触させた状態で、前記隙間に前記第二アルミニウム合金を流入させながら、前記突合せ部よりも前記第二金属部材側に設定された設定移動ルートに沿って所定の深さで前記第二金属部材の外周面の廻りに一周させて前記突合せ部に摩擦攪拌を行った後、前記攪拌ピンを前記傾斜台の傾斜面に沿って昇るように移動させて当該傾斜面の上側で引抜く本接合工程と、
前記傾斜台を除去する傾斜台除去工程と、を含むことを特徴とする摩擦攪拌接合方法。 A columnar first metal member having a small diameter portion at the end of a large diameter portion and a tubular second metal member having an inner diameter substantially equal to that of the small diameter portion are abutted against each other to be joined. A friction stir welding method in which friction stir welding is performed on a butt portion of a metal member using a rotary tool equipped with a stirring pin.
The first metal member is formed of a first aluminum alloy, the second metal member is formed of a second aluminum alloy, and the first aluminum alloy is a grade having a higher hardness than the second aluminum alloy. And
The stirring pin is tapered and
A preparatory step of forming an inclined table that is close to the end surface of the second metal member and protrudes from the outer peripheral surface of the second metal member.
By inserting the small diameter portion of the first metal member into the opening on the inclined table side of the second metal member, the inner peripheral surface of the second metal member and the stepped side surface of the first metal member are overlapped. A butt step of abutting the end face of the second metal member and the stepped inclined surface of the first metal member to form a gap having a V-shaped cross section in the butt portion.
The gap is formed by inserting the stirring pin of the rotating tool into the outer peripheral surface of the second metal member and slightly contacting the outer peripheral surface of the stirring pin with the stepped inclined surface of the first metal member. While flowing the second aluminum alloy into the butt, the second metal member is made to go around the outer peripheral surface of the second metal member at a predetermined depth along a set movement route set on the second metal member side of the butt portion. After performing friction stir welding on the butt portion, the stirring pin is moved so as to rise along the inclined surface of the inclined table and pulled out on the upper side of the inclined surface.
A friction stir welding method comprising a tilting table removing step of removing the tilting table.

大径部の端部に小径部を備えた円柱状の第一金属部材と、前記小径部と略同等の内径を有する円筒状の第二金属部材とを端面同士で突き合わせて形成された被接合金属部材の突合せ部に対して攪拌ピンを備える回転ツールを用いて摩擦攪拌を行う摩擦攪拌接合方法であって、
前記第一金属部材は第一アルミニウム合金で形成されており、前記第二金属部材は第二アルミニウム合金で形成されており、前記第一アルミニウム合金は前記第二アルミニウム合金よりも硬度が高い材種であり、
前記攪拌ピンは先細りとなっており、
前記第一金属部材の前記大径部と前記小径部との境に近接するとともに前記第一金属部材の外周面から突出する傾斜台を形成する準備工程と、
前記第二金属部材の開口部に前記第一金属部材の前記小径部を挿入することにより、前記第二金属部材の内周面と前記第一金属部材の段差側面とを重ね合わせるとともに、前記第二金属部材の端面と前記第一金属部材の段差傾斜面とを突き合わせて突合せ部に断面Ｖ字状の隙間を形成する突合せ工程と、
回転する前記回転ツールの前記攪拌ピンを前記第二金属部材の外周面に挿入し、前記攪拌ピンの外周面を前記第一金属部材の前記段差傾斜面にわずかに接触させた状態で、前記隙間に前記第二アルミニウム合金を流入させながら、前記突合せ部よりも前記第二金属部材側に設定された設定移動ルートに沿って所定の深さで前記第二金属部材の外周面の廻りに一周させて前記突合せ部に摩擦攪拌を行った後、前記攪拌ピンを前記傾斜台の傾斜面に沿って昇るように移動させて当該傾斜面の上側で引抜く本接合工程と、
前記傾斜台を除去する傾斜台除去工程と、を含むことを特徴とする摩擦攪拌接合方法。 A cylindrical first metal member having a small diameter portion at the end of a large diameter portion and a cylindrical second metal member having an inner diameter substantially equal to that of the small diameter portion are abutted against each other to be joined. This is a friction stir welding method in which friction stir welding is performed using a rotary tool provided with a stirring pin for the butt portion of a metal member.
The first metal member is formed of a first aluminum alloy, the second metal member is formed of a second aluminum alloy, and the first aluminum alloy is a grade having a higher hardness than the second aluminum alloy. And
The stirring pin is tapered and
A preparatory step of forming an inclined table that is close to the boundary between the large-diameter portion and the small-diameter portion of the first metal member and protrudes from the outer peripheral surface of the first metal member.
By inserting the small diameter portion of the first metal member into the opening of the second metal member, the inner peripheral surface of the second metal member and the stepped side surface of the first metal member are overlapped, and the first (Ii) A butt step of abutting the end face of the metal member and the stepped inclined surface of the first metal member to form a gap having a V-shaped cross section at the butt portion.
The gap is formed by inserting the stirring pin of the rotating tool into the outer peripheral surface of the second metal member and slightly contacting the outer peripheral surface of the stirring pin with the stepped inclined surface of the first metal member. While flowing the second aluminum alloy into the butt, the second metal member is made to go around the outer peripheral surface of the second metal member at a predetermined depth along a set movement route set on the second metal member side of the butt portion. After performing friction stir welding on the butt portion, the stirring pin is moved so as to rise along the inclined surface of the inclined table and pulled out on the upper side of the inclined surface.
A friction stir welding method comprising a tilting table removing step of removing the tilting table.

大径部の端部に小径部を備えた円柱状の第一金属部材と、前記小径部と略同等の内径を有する円筒状の第二金属部材とを端面同士で突き合わせて形成された被接合金属部材の突合せ部に対して攪拌ピンを備える回転ツールを用いて摩擦攪拌を行う摩擦攪拌接合方法であって、
前記第一金属部材は第一アルミニウム合金で形成されており、前記第二金属部材は第二アルミニウム合金で形成されており、前記第一アルミニウム合金は前記第二アルミニウム合金よりも硬度が高い材種であり、
前記攪拌ピンは先細りとなっており、
前記第二金属部材の端面に近接するとともに前記第二金属部材の外周面から突出する傾斜台を形成する準備工程と、
前記第二金属部材の前記傾斜台側の開口部に前記第一金属部材の前記小径部を挿入することにより、前記第二金属部材の内周面と前記第一金属部材の段差側面とを重ね合わせるとともに、前記第二金属部材の端面と前記第一金属部材の段差傾斜面とを突き合わせて突合せ部に断面Ｖ字状の隙間を形成する突合せ工程と、
回転する前記回転ツールの前記攪拌ピンを前記第二金属部材の外周面に挿入し、前記攪拌ピンの外周面を前記第一金属部材の前記段差傾斜面にわずかに接触させた状態で、前記隙間に前記第二アルミニウム合金を流入させながら、前記突合せ部よりも前記第二金属部材側に設定された設定移動ルートに沿って所定の深さで前記第二金属部材の外周面の廻りに一周させて前記突合せ部に摩擦攪拌を行った後、前記攪拌ピンを前記傾斜台の傾斜面に沿って昇るように移動させて当該傾斜面の上側で引抜く本接合工程と、
前記傾斜台を除去する傾斜台除去工程と、を含むことを特徴とする摩擦攪拌接合方法。 A cylindrical first metal member having a small diameter portion at the end of a large diameter portion and a cylindrical second metal member having an inner diameter substantially equal to that of the small diameter portion are abutted against each other to be joined. This is a friction stir welding method in which friction stir welding is performed using a rotary tool provided with a stirring pin for the butt portion of a metal member.
The first metal member is formed of a first aluminum alloy, the second metal member is formed of a second aluminum alloy, and the first aluminum alloy is a grade having a higher hardness than the second aluminum alloy. And
The stirring pin is tapered and
A preparatory step of forming an inclined table that is close to the end surface of the second metal member and protrudes from the outer peripheral surface of the second metal member.
By inserting the small diameter portion of the first metal member into the opening on the inclined table side of the second metal member, the inner peripheral surface of the second metal member and the stepped side surface of the first metal member are overlapped. A butt step of abutting the end face of the second metal member and the stepped inclined surface of the first metal member to form a gap having a V-shaped cross section in the butt portion.
The gap is formed by inserting the stirring pin of the rotating tool into the outer peripheral surface of the second metal member and slightly contacting the outer peripheral surface of the stirring pin with the stepped inclined surface of the first metal member. While flowing the second aluminum alloy into the butt, the second metal member is made to go around the outer peripheral surface of the second metal member at a predetermined depth along a set movement route set on the second metal member side of the butt portion. After performing friction stir welding on the butt portion, the stirring pin is moved so as to rise along the inclined surface of the inclined table and pulled out on the upper side of the inclined surface.
A friction stir welding method comprising a tilting table removing step of removing the tilting table.