JP2012148297A

JP2012148297A - Friction stir joining method

Info

Publication number: JP2012148297A
Application number: JP2011007925A
Authority: JP
Inventors: Hiroshi Chikuma; 浩竹間; Hiroyasu Nadamoto; 浩康灘本; Soichiro Yamamoto; 宗一郎山本
Original assignee: Calsonic Kansei Corp
Current assignee: Marelli Corp
Priority date: 2011-01-18
Filing date: 2011-01-18
Publication date: 2012-08-09

Abstract

PROBLEM TO BE SOLVED: To provide a friction stir joining method for suppressing decrease in combining strength when carrying out friction joining so that a thin member to be joined and a thick member to be joined are abutted and a joining terminating position is returned at least to a joining starting position.SOLUTION: A joining starting part K1 of a pin 7a is made to be a position on an abutting line E of a thin cylinder body 1 and a thick cylinder body 2. The pin 7a is meandered and moved toward the joining starting part K1 to allow the pin 7a to move from the joining starting part K1 through a thin cylinder body 1 side toward a thick cylinder body 2 side in a range W where the dissolving part Y of the thin cylinder body 1 and the thick cylinder body 2 by the pin 7a overlaps relative to the abutting line E in the joining center line M of the pin 7a. The joining terminating part K2 of the pin 7a is made to be in a position passing the vicinity of the joining starting part K1, and the joining terminating part K2 at this position is made to be in a position closer to the thick cylinder body 2 than the position m of the pin 7a that is earlier meandered from the joining starting part K1.

Description

本発明は、被接合部材同士を突き当てて、この突き当て部分に回転ツールのピンを押圧しながら回転することで発生する摩擦熱で突き当て部分を塑性流動して、冷却後一体的に接合させるようにした摩擦攪拌接合方法に関する。 In the present invention, the members to be joined are brought into contact with each other, and the abutting portion is plastically flowed by frictional heat generated by rotating while pressing the pin of the rotary tool against the abutting portion, and then integrally joined after cooling. The present invention relates to a friction stir welding method.

従来、摩擦攪拌接合方法としては、薄肉のアルミニウム合金板と厚肉のアルミニウム合金板を、これらの被接合側表面の高さが同じになるようにして定盤上で突き合わせ、その被接合箇所から厚肉側へ少しオフセットした位置で回転ツールの先端に設けたピンおよび回転ツールのショルダ部をアルミニウム合金板に押圧しながら回転させ、発生した摩擦熱でその押圧箇所やその近辺部分を塑性流動させて両アルミニウム合金板を接合するようにしたものが知られている（例えば、特許文献１参照）。 Conventionally, as a friction stir welding method, a thin aluminum alloy plate and a thick aluminum alloy plate are abutted on a surface plate so that the height of the surfaces to be joined is the same, and from the place to be joined. The pin provided at the tip of the rotary tool and the shoulder of the rotary tool are rotated while pressing against the aluminum alloy plate at a position slightly offset to the thick wall side, and the generated frictional heat causes the pressed part and its vicinity to plastically flow. There is known a technique in which both aluminum alloy plates are joined (see, for example, Patent Document 1).

特開２００２−２２４８５８号公報JP 2002-224858 A

上記従来の摩擦攪拌接合方法では、ピンを突き合わせ箇所より厚肉のアルミニウム合金板側へオフセットした位置で押圧・回転させるので、この結果発生する摩擦熱は厚肉のアルミニウム合金板側でより多く発生し、熱容量が小さい薄肉のアルミニウム合金板では少なくなるので、薄肉のアルミニウム合金板の変形を小さく抑えることが可能となる。
しかしながら、この従来の方法を用いて、薄肉の被接合部材と厚肉の被接合部材とを突き合わせ、この突き合わせ箇所からオフセットした位置で摩擦撹拌接合を実施する場合には、接合箇所のどの部分も厚肉側に偏ってしまい、全体の結合強度が劣化してしまうという問題があった。また、たとえばタンク容器のように、漏れがあっては困るものにあっては、ピンの接合終点位置が少なくとも接合開始位置まで戻ってくる摩擦撹拌接合を行う必要があり、接合終点部の外周部分に繰り返し加圧による応力集中が生じてしまって、接合終了時の部分の接合強度が劣化してしまうといった問題があった。 In the above conventional friction stir welding method, the pin is pressed and rotated at a position offset from the butted part to the thick aluminum alloy plate, so that more frictional heat is generated on the thick aluminum alloy plate. However, since the thickness of the aluminum alloy plate having a small heat capacity is small, the deformation of the thin aluminum alloy plate can be suppressed to be small.
However, when using this conventional method, a thin-walled member and a thick-walled member are abutted and friction stir welding is performed at a position offset from this abutting location, any part of the junction location is There is a problem in that it is biased toward the thick wall side and the overall bond strength is deteriorated. In addition, if there is something that should not be leaked, such as a tank container, it is necessary to perform friction stir welding at which the joining end point position of the pin returns to at least the joining start position. In other words, stress concentration due to repeated pressurization occurs, and the bonding strength at the end of the bonding deteriorates.

本発明は、上記問題に着目してなされたもので、その目的とするところは、被接合部材がこれらの薄肉部と厚肉部とを突き合わせて接合終了位置が少なくとも接合開始位置まで戻ってくるように摩擦接合する場合にも、その結合強度が低下するのを抑えることができる摩擦攪拌接合方法を提供することにある。 The present invention has been made paying attention to the above-mentioned problem, and the object is to join the thin-walled portion and the thick-walled portion so that the joining end position returns to at least the joining start position. Thus, the present invention also provides a friction stir welding method capable of suppressing a decrease in the bonding strength even when performing friction welding.

この目的のため、請求項１に記載の本発明による摩擦攪拌接合方法は、
第１被接合部材の薄肉部と第２被接合部材の厚肉部とを突き合わせて、この突き合わせ箇所の部分に、ピンを先端に設けた回転ツールを回転しながら押圧することで発生した摩擦熱で、突き合わせ箇所の部分を塑性流動させて両被接合部材同士を接合するようにした摩擦攪拌接合方法であって、
ピンの接合開始部は、薄肉部と厚肉部の突き合わせ線上の位置とし、続いてピンの接合中心線を、突き合わせ線に対し、ピンによる薄肉部と厚肉部の溶解部がオーバーラップしていく範囲内で、接合開始部から薄肉部側を通って厚肉部側へ向かうようにピンを蛇行させて接合開始部に向かわせた後、ピンの接合終了部を接合開始部又はこの近傍を通り過ぎた位置であって、この位置における接合終了部が先に接合開始部から蛇行させたピンの位置より厚肉部側にある位置とした、
ことを特徴とする。 For this purpose, the friction stir welding method according to the invention as claimed in claim 1 comprises:
Frictional heat generated by abutting the thin part of the first member to be joined and the thick part of the second member to be joined, and pressing the rotating tool provided with a pin at the tip of the abutting part while rotating. Then, it is a friction stir welding method in which the parts to be joined are plastically flowed to join both members to be joined,
The joining start part of the pin is located on the butt line between the thin part and thick part, and then the joining center line of the pin overlaps the butt line with the melted part of the thin part and thick part by the pin. Within a certain range, after the pin meanders from the joining start part to the thick part side through the thin part side to the joining start part, the joining end part of the pin is moved to the joining start part or its vicinity. It is a position that has passed, and the position where the joining end part at this position is on the thick part side from the position of the pin meandered from the joining start part first,
It is characterized by that.

請求項２に記載の本発明による摩擦攪拌接合方法は、請求項１に記載の発明において、第２被接合部材の厚肉部が、第１被接合部の薄肉部を係合可能な段差を有するようにしたことを特徴とする。 The friction stir welding method according to the second aspect of the present invention is the friction stir welding method according to the first aspect of the present invention, wherein the thick portion of the second member to be joined has a step that can engage the thin portion of the first joint portion. It is characterized by having it.

請求項３に記載の本発明による摩擦攪拌接合方法は、請求項１又は２に記載の発明において、第１被接合部材および第２被接合部材が円筒状部材であることを特徴とする。 A friction stir welding method according to the present invention as set forth in claim 3 is characterized in that, in the invention according to claim 1 or 2, the first and second members to be joined are cylindrical members.

請求項１に記載の本発明の摩擦攪拌接合方法にあっては、接合開始点から接合終了点の間を蛇行させながらピンを相対移動させるようにしたので、一部の薄肉部側にも厚肉部側より溶融部が寄ることとなって、厚肉部との結合強度を向上させることができる。また、この場合、薄肉部の一部にしか溶融部が偏らないので、応力集中による薄肉部の変形を抑えて漏れを防止することができる。また、接合終了点を、接合開始部又はこの近傍を通り過ぎた位置であって、この位置における接合終了部が先に接合開始部から蛇行させたピンの位置より厚肉部側にある位置としたので、この部分を繰り返し摩擦攪拌接合しても強度的に弱くなるのを抑制できる。 In the friction stir welding method according to the first aspect of the present invention, since the pin is relatively moved while meandering from the joining start point to the joining end point, the thickness of the thin portion is also increased. Since the melted part is closer to the meat part side, the bond strength with the thick part can be improved. Further, in this case, since the melted part is biased to only a part of the thin part, the deformation of the thin part due to the stress concentration can be suppressed and leakage can be prevented. Also, the joining end point is a position that has passed the joining start portion or the vicinity thereof, and the joining end portion at this position is a position on the thick portion side from the position of the pin meandered from the joining start portion first. Therefore, even if this part is repeatedly friction stir welded, it can suppress that it becomes weak in strength.

請求項２に記載の本発明の摩擦攪拌接合方法にあっては、第２被接合部材の突き合わせ箇所を厚肉部の段差にかつ第１被接合部材の薄肉部を係合させた状態でこの部分を摩擦接合するようにしたので、強度を高くすることができ、また、摩擦熱による歪みも抑えることができる。さらに、被接合部材がいずれも薄肉であっても、突き合わせ箇所の一方を段差付き厚肉部とすることで、強度が高く歪みも抑えて薄肉の被接合部材同士を摩擦攪拌接合できる。 In the friction stir welding method according to the second aspect of the present invention, in the state where the butted portion of the second member to be joined is engaged with the step of the thick portion and the thin portion of the first member to be joined. Since the portions are friction-bonded, the strength can be increased and distortion due to frictional heat can also be suppressed. Furthermore, even if all the members to be joined are thin, by making one of the butted portions a thick part with a step, the thin members to be joined can be friction stir welded with high strength and reduced distortion.

請求項３に記載の本発明の摩擦攪拌接合方法にあっては、第１被接合部材および第２被接合部材を円筒状部材としたので、容易にタンク等を形成することが可能となる。 In the friction stir welding method according to the third aspect of the present invention, since the first member to be joined and the second member to be joined are cylindrical members, a tank or the like can be easily formed.

本発明の実施例１の摩擦攪拌接合方法で用いられる摩擦攪拌接合装置の接合開始直前の状態を示す平面図である。It is a top view which shows the state just before the start of joining of the friction stir welding apparatus used with the friction stir welding method of Example 1 of this invention. 図１のＳ２−Ｓ２線における拡大縦断面図である。FIG. 2 is an enlarged longitudinal sectional view taken along line S2-S2 of FIG. 本発明の実施例１の摩擦攪拌接合方法が適用される被接合部材を示す断面図である。It is sectional drawing which shows the to-be-joined member to which the friction stir welding method of Example 1 of this invention is applied. 本発明の実施例１の摩擦攪拌接合方法により接合した被接合部材を展開して示す図で、（イ）はその展開図、（ロ）は（イ）のａ１−ａ１線、ａ２−ａ２線、ａ３−ａ３線、ａ４−ａ４線、ａ５−ａ５線、ａ６−ａ６線、ａ７−ａ７線、における断面図である。BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which expand | deploys and shows the to-be-joined member joined by the friction stir welding method of Example 1 of this invention, (A) is the expanded view, (B) is the a1-a1 line and a2-a2 line of (A). , A3-a3 line, a4-a4 line, a5-a5 line, a6-a6 line, a7-a7 line. 実施例１の摩擦攪拌接合方法による接合始点と接合終点部分を示す要部の平面図である。It is a top view of the principal part which shows the joining start point by the friction stir welding method of Example 1, and the joining end point part. 図５のＳ６−Ｓ６線における断面図である。It is sectional drawing in the S6-S6 line of FIG. 本発明の実施例２の摩擦攪拌接合方法を示す断面図である。It is sectional drawing which shows the friction stir welding method of Example 2 of this invention. 本発明の実施例３の摩擦攪拌接合方法を示す断面図である。It is sectional drawing which shows the friction stir welding method of Example 3 of this invention. 本発明のさらに別の実施例の摩擦攪拌接合方法を示す断面図である。It is sectional drawing which shows the friction stir welding method of another Example of this invention.

以下、本発明の実施の形態を、図面に示す実施例に基づき詳細に説明する。 Hereinafter, embodiments of the present invention will be described in detail based on examples shown in the drawings.

本実施例では、被接合部材Ｇとして、薄肉円筒体（第１被接合部材）１と、この薄肉円筒体１と外径を同じくする厚肉円筒体（第２被接合部材）２との突き合わせ箇所Ｐを摩擦攪拌接合する。
まず、上記摩擦攪拌接合方法を実行するための摩擦攪拌接合装置につき、図１、２に基づき説明する。なお、図１，２は摩擦攪拌接合を行う直前の状態を示している。 In this embodiment, as a member to be joined G, a thin cylindrical body (first member to be joined) 1 and a thick cylindrical body (second member to be joined) 2 having the same outer diameter as the thin cylindrical body 1 are abutted. The point P is friction stir welded.
First, a friction stir welding apparatus for executing the friction stir welding method will be described with reference to FIGS. 1 and 2 show a state immediately before the friction stir welding is performed.

この摩擦攪拌接合装置は、薄肉円筒体１の開口端部付近の外周面に当接し、薄肉円筒体１を水平状態で回転可能に支持する３つのワーク受けローラ３と、薄肉円筒体１の芯出しをした状態で薄肉円筒体１側を回転自在に支持するセンター出し治具４と、厚肉円筒体２側をチャック装置５で挟持して被接合部材Ｇを軸心Ｑまわりに回転させる電動モータ６と、回転ツール７と、回転ツール７を高速回転させる電動モータ７ｂと、を備える。また、この回転ツール７は、図示を省略した駆動機構により、その軸心方向（水平方向）の進退可能となっている。 This friction stir welding apparatus is in contact with the outer peripheral surface near the opening end of the thin-walled cylindrical body 1, and supports three workpiece receiving rollers 3 that rotatably support the thin-walled cylindrical body 1 in a horizontal state, and the core of the thin-walled cylindrical body 1. A centering jig 4 that rotatably supports the thin cylindrical body 1 in the extended state, and an electric motor that rotates the member G to be rotated about the axis Q by sandwiching the thick cylindrical body 2 side with the chuck device 5. A motor 6, a rotary tool 7, and an electric motor 7 b that rotates the rotary tool 7 at a high speed are provided. The rotary tool 7 can be advanced and retracted in the axial direction (horizontal direction) by a drive mechanism (not shown).

回転ツール７は、先端部に備えたピン７ａとそのショルダ部を、薄肉円筒体１と厚肉円筒体２の突き合わせ箇所Ｐに対し、その側面から水平状態で押圧し、回転ツール７を電動モータ７ａで高速回転させながら被接合部材Ｇを回転（回転ツール７との相対移動）させることにより、発生した摩擦熱で突き合わせ箇所Ｐを塑性流動させて該突き合わせ箇所Ｐを接合する。なお、ピン付き回転ツール７は、この軸心が水平面上にある必要はなく、付き合わせ箇所Ｐの上方など任意の位置に設置しても良い。 The rotary tool 7 presses the pin 7a provided at the tip portion and its shoulder portion in a horizontal state from the side surface against the abutting portion P of the thin-walled cylindrical body 1 and the thick-walled cylindrical body 2, and the rotary tool 7 is driven by the electric motor. By rotating the member G to be joined while rotating at a high speed 7a (relative movement with the rotating tool 7), the butt portion P is plastically flowed by the generated frictional heat, and the butt portion P is joined. In addition, the rotation tool 7 with a pin does not need to have this axial center on a horizontal surface, and may be installed in arbitrary positions, such as the upper part of the attachment part P. FIG.

被接合部材Ｇは、図３に詳細に示すように、薄肉円筒体（第１被接合部材）１と、この薄肉円筒体１と外径を同じくする厚肉円筒体（第２被接合部材）２と、からなり、厚肉円筒体２における薄肉円筒体１との突き合わせ箇所Ｐ側端面には、段差を設けて形成した小径部２ａを有し、この小径部２ａを薄肉円筒体１の開口部１ａ内に差し込み係合した状態で突き合わせ箇所Ｐの摩擦攪拌接合が行われる。 As shown in detail in FIG. 3, the member G to be joined includes a thin cylindrical body (first joined member) 1 and a thick cylindrical body (second joined member) having the same outer diameter as the thin cylindrical body 1. 2 and has a small-diameter portion 2a formed with a step on the end surface of the thick-walled cylindrical body 2 where the butted portion P is abutted with the thin-walled cylindrical body 1. Friction stir welding of the butted portion P is performed in a state of being inserted and engaged in the portion 1a.

次に、上記摩擦攪拌接合装置を用いた実施例１の摩擦攪拌接合方法を図４〜６に基づいて説明する。
まず、図１，２に示すように、被接合部材Ｇを摩擦攪拌接合装置にセットした状態で、回転ツール７を高速回転しながら前進させ、回転ツール７のピン７ａを突き合わせ箇所Ｐに押圧し、被接合部材Ｇを回転させて行くことにより、被接合部材Ｇの突き合わせ箇所Ｐを摩擦攪拌接合して行く。
その際、まず、ピン７ａを押圧する接合開始部Ｋ１は、図４、５に示すように、薄肉円筒体１と厚肉円筒体２の突き合わせ線Ｅ上の位置とする。なお、図４は、外周面を展開して示した図である。したがって、３６０°で被接合部材Ｇが１回転することになる。なお、図４において、線Ｄは、ピン7aによる溶融部Ｙにおける薄肉円筒体１側端部である接合基点ｄ１の軌跡を示す。 Next, the friction stir welding method of Example 1 using the friction stir welding apparatus will be described with reference to FIGS.
First, as shown in FIGS. 1 and 2, with the member G to be joined set in the friction stir welding apparatus, the rotary tool 7 is advanced while rotating at high speed, and the pin 7a of the rotary tool 7 is pressed against the butted portion P. By rotating the member to be joined G, the butted portion P of the member to be joined G is friction stir welded.
At that time, first, the joining start portion K1 that presses the pin 7a is positioned on the butt line E between the thin cylindrical body 1 and the thick cylindrical body 2 as shown in FIGS. FIG. 4 is an expanded view of the outer peripheral surface. Therefore, the member G to be joined makes one rotation at 360 °. In FIG. 4, a line D indicates a locus of the joining base point d1 that is the end portion on the thin cylindrical body 1 side in the melted portion Y by the pin 7a.

接合開始部Ｋ１に続いて、被接合部材Ｇの回転に伴い、図４に示すように、ピン７ａの接合中心線Ｍを、突き合わせ線Ｅに対し、ピン７ａによる薄肉円筒体１と厚肉円筒体２の溶解部Ｙがオーバーラップしていく範囲Ｗ内で、突き合わせ線Ｅ上の接合開始部Ｋ１から薄肉円筒体１側を通って被接合部材Ｇを４５°程度回転させた所で厚肉円筒体２側へ向かわせ、９０°付近で突き合わせ線Ｅより厚肉円筒体２側へ寄り始めて、また１８０°付近で突き合わせ線Ｅより薄肉円筒体１側へ寄り、２７０°付近で厚肉側に寄るようにピン７ａを緩やかに蛇行させて３６０°付近で接合開始部Ｋ１もしくはその近傍に向かわせる。したがって、この場合、上記従来技術によるものの場合より、薄肉円筒体１側にも溶融部が寄ることで被接合部材Ｇ全体の強度が向上することとなる。 Following the joining start portion K1, as shown in FIG. Within the range W where the melted portion Y of the body 2 overlaps, the thick member is obtained by rotating the member G to be joined by about 45 ° from the joining start portion K1 on the butt line E through the thin cylindrical body 1 side. Heading toward the cylindrical body 2 side, starts to approach the thick cylindrical body 2 side from the butt line E near 90 °, and further toward the thin cylindrical body 1 side from the butt line E near 180 °, the thick side near 270 ° The pin 7a is gently meandered so as to approach the joining start portion K1 or the vicinity thereof at around 360 °. Therefore, in this case, the strength of the entire member G to be joined is improved by moving the melted portion closer to the thin cylindrical body 1 than in the case of the conventional technique.

その後、ピン７ａの接合終了部Ｋ２を、接合開始部Ｋ１を通り過ぎた位置であってこの位置における接合終了部Ｋ２が先に接合開始部Ｋ１から薄肉円筒体１側へ向けて蛇行させたピン７ａの位置ｍより厚肉円筒体２側にある位置となるように制御する。本実施例では、接合終了部Ｋ２は、突き合わせ線Ｅ上とする。接合終了部Ｋ２では、回転ツール７を後退させてピン７ａを突き合わせ箇所Ｐの溶融部分から引き抜く。その結果、図４（ロ）の接合終了部Ｋ２での断面図および図７で明らかなように、接合開始点Ｋ１から接合終了部Ｋ２の間は、先に薄肉円筒体１側に溶融部Ｙが形成された後をオーバーラップしながら、再度、摩擦攪拌接合しながらピン７ａが相対移動することになるが、この再度の摩擦攪拌接合による溶融部の接合基点ｄ１は、突き合わせ線Ｅ上で先の溶融部Ｙの接合基点より厚肉円筒体２側に位置するので、強度的に強い箇所で摩擦攪拌接合が終了しピン７ａが引き抜かれることとなる。
なお、上記溶解部Ｙが、突き合わせ箇所Ｐ、薄肉円筒体１と厚肉円筒体２との両方の部分にオーバーラップするようにするには、突き合わせ線Ｅ上にピン７ａがあるときのこのピン７ａの外径の範囲内Ｗ（図５参照）とすることが望ましい。 Thereafter, the joining end portion K2 of the pin 7a is a position past the joining start portion K1, and the joining end portion K2 at this position first meanders from the joining start portion K1 toward the thin cylindrical body 1 side. The position is controlled so that it is located on the thick cylindrical body 2 side from the position m. In this embodiment, the joining end portion K2 is on the butt line E. At the joining end portion K2, the rotary tool 7 is retracted and the pin 7a is pulled out from the melted portion of the butted portion P. As a result, as is clear from the cross-sectional view at the joining end portion K2 in FIG. 4B and FIG. 7, between the joining start point K1 and the joining end portion K2, the melted portion Y is first placed on the thin cylindrical body 1 side. The pin 7a moves relative to each other while the friction stir welding is performed again, while the overlap is formed, and the joining base point d1 of the melted portion by the second friction stir welding is the tip on the butt line E. Therefore, the friction stir welding is completed at a location where the strength is strong, and the pin 7a is pulled out.
In addition, in order that the said melt | dissolution part Y may overlap with the both locations of the butting location P and the thin cylindrical body 1 and the thick cylindrical body 2, this pin when the pin 7a exists on the butting line E It is desirable that the outer diameter is 7 W (see FIG. 5).

以上のように、実施例１の摩擦攪拌接合方法にあっては、以下の効果を得ることができる。
(1) ピン７ａの接合中心線Ｍを、突き合わせ線Ｅに対し、ピン７ａによる薄肉円筒体１と厚肉円筒体２の溶解部Ｙがオーバーラップしていく範囲Ｗ内で、接合開始部Ｋ１から薄肉円筒体１側を通って厚肉円筒体２側へ向かうようにピン７ａを緩やかに蛇行させて接合開始部Ｋ１に向かわせるようにした。
これにより、接合箇所が厚肉円筒体２側に偏ることがなく薄肉円筒体１側にも一部寄るようになるため、被接合部材Ｇ全体の結合強度の劣化を防止することができる。 As described above, in the friction stir welding method of Example 1, the following effects can be obtained.
(1) The joining start line K1 of the joining center line M of the pin 7a is within a range W where the melted portion Y of the thin cylindrical body 1 and the thick cylindrical body 2 overlaps the butt line E with the pin 7a. Then, the pin 7a is gently meandered from the thin-walled cylindrical body 1 side to the thick-walled cylindrical body 2 side so as to be directed to the joining start portion K1.
As a result, the joining location does not deviate toward the thick cylindrical body 2 and partly approaches the thin cylindrical body 1 side, so that it is possible to prevent deterioration of the coupling strength of the entire joined member G.

(2) 接合終了部Ｋ２におけるピン７ａの接合中心線Ｍの位置が、接合開始部Ｋ１を通り過ぎた位置であってこの位置における接合終了部Ｋ２が先に接合開始部Ｋ１から薄肉円筒体１側へ向けて蛇行させたピン７ａの位置ｍより厚肉円筒体２側にある位置となる。
これにより、接合終了部Ｋ２における溶融部Ｙの薄肉円筒体１側端部である接合基点ｄ１の位置が、先に接合開始部Ｋ１から薄肉円筒体１側へ向けて蛇行させた溶融部Ｙの薄肉円筒体１側端部である接合基点ｄ２の位置より厚肉円筒体２側となるため、接合終了部Ｋ２における薄肉円筒体１側における繰り返し加圧による応力集中を抑制して、接合終了部Ｋ２の接合強度低下を抑制することができる。 (2) The position of the joining center line M of the pin 7a at the joining end portion K2 is a position that has passed the joining start portion K1, and the joining end portion K2 at this position is first from the joining start portion K1 to the thin cylindrical body 1 side. The position is located on the thick-walled cylindrical body 2 side from the position m of the pin 7a meandering toward the top.
Thereby, the position of the joining base point d1 which is the thin cylindrical body 1 side end part of the fusion | melting part Y in the joining completion part K2 of the fusion | melting part Y made to meander from the joining start part K1 toward the thin cylindrical body 1 side previously. Since it is on the thick cylindrical body 2 side from the position of the joining base point d2 that is the end on the thin cylindrical body 1 side, stress concentration due to repeated pressurization on the thin cylindrical body 1 side in the joining end portion K2 is suppressed, and the joining end portion A decrease in the bonding strength of K2 can be suppressed.

次に、他の実施例について説明する。なお、この他の実施例の説明にあたっては、上記実施例１と同様の構成部分については図示を省略し、もしくは同一の符号を付けてその説明を省略し、相違点についてのみ説明する。 Next, another embodiment will be described. In the description of the other embodiments, the same components as those of the first embodiment are not shown, or the same reference numerals are given and the description thereof is omitted, and only the differences are described.

この実施例２の摩擦攪拌接合方法は、図７に示すように、被接合部材Ｇとして、薄肉円筒体（第１被接合部材）１０と、この薄肉円筒体１と外径を同じくする厚肉円柱体（第２被接合部材）２０との突き合わせ箇所Ｐを摩擦攪拌接合するようにした点が、円筒同士の突き合わせ箇所Ｅを摩擦攪拌接合する実施例１とは相違する。 In the friction stir welding method of Example 2, as shown in FIG. 7, a thin cylindrical body (first bonded member) 10 and a thick wall having the same outer diameter as that of the thin cylindrical body 1 are used. The point where the abutting point P with the columnar body (second member to be joined) 20 is friction stir welded is different from the first example in which the abutting point E between the cylinders is friction stir welded.

すなわち、この実施例２では、厚肉円柱体２０における薄肉円筒体１０との突き合わせ箇Ｐ所側端面には、段差を設けて形成した小径部２０ａを有し、この小径部２０ａを薄肉円筒体１０の開口部１０ａ内に差し込み係合した状態で突き合わせ箇所Ｐの摩擦攪拌接合が行われる。
従って、この実施例２では、上記実施例１と同様の効果が得られる。 That is, in the second embodiment, the thick cylindrical body 20 has a small diameter portion 20a formed with a step on the end surface on the side where the thin cylindrical body 10 abuts with the thin cylindrical body 10, and the small diameter portion 20a is formed into a thin cylindrical body. Friction stir welding of the butted portion P is performed in a state of being inserted into and engaged with the ten openings 10a.
Therefore, in the second embodiment, the same effect as in the first embodiment can be obtained.

この実施例３の摩擦攪拌接合方法は、図８に示すように、被接合部材Ｇとして、薄肉円筒体（第１被接合部材）１１と、この薄肉円筒体１１と外径が同じで、接合側端部に段差を設けて形成した、内側に肉厚となる厚肉部２１ａを有する厚肉円筒体（第２被接合部材）２１との突き合わせ箇所Ｐを摩擦攪拌接合するようにした点が、円筒体同士の突き合わせ箇所Ｐを摩擦攪拌接合する実施例１とは相違する。 In the friction stir welding method of Example 3, as shown in FIG. 8, the thin member (first member to be joined) 11 is the same as the member to be joined G, and the thin cylinder 11 has the same outer diameter. A point where the abutting point P with the thick cylindrical body (second member to be joined) 21 having a thick portion 21a on the inside formed by providing a step at the side end portion is friction stir welded. This is different from the first embodiment in which the butted portion P between the cylindrical bodies is friction stir welded.

すなわち、この実施例３では、厚肉円筒体２１の厚肉部２１ａにおける薄肉円筒体１１との突き合わせ箇所Ｐ側端面には、小径部２１ｂを有し、この小径部２１ｂを薄肉円筒体１１の開口部１１ａ内に差し込み係合した状態で突き合わせ箇所Ｐの摩擦攪拌接合が行われる。
従って、この実施例３では、上記実施例１と同様の効果が得られる。 That is, in the third embodiment, the thick-walled portion 21a of the thick-walled cylindrical body 21 has a small-diameter portion 21b on the end face of the thin-walled cylindrical body 11 on the abutting portion P side. Friction stir welding of the butted portion P is performed in a state of being inserted into and engaged with the opening 11a.
Therefore, in the third embodiment, the same effect as in the first embodiment can be obtained.

以上、本発明を上記各実施例に基づき説明してきたが、本発明はこれらの実施例に限られず、本発明の要旨を逸脱しない範囲で設計変更等があった場合でも、本発明に含まれる。 The present invention has been described based on the above embodiments. However, the present invention is not limited to these embodiments, and is included in the present invention even when there is a design change or the like without departing from the gist of the present invention. .

たとえば、実施例では、被接合部材Ｇとして円筒体同士を摩擦攪拌接合する場合を示したが、平板同士を摩擦攪拌接合する場合にも本発明を適用することができる。 For example, in the embodiment, the case where the cylindrical bodies are friction stir welded as the members to be joined G has been shown, but the present invention can also be applied to the case where the flat plates are friction stir welded.

また、実施例では、被接合部材Ｇとして、厚肉部側に薄肉部を重ねる段部（小径部）を有する場合を示したが、図９に示すように、段部を設けず、厚肉板材（第２被接合部材）２２と薄肉板材（第１被接合部材）１２の端面を単に突き合わせた状態で、突き合わせ箇所Ｐを摩擦攪拌接合するようにしてもよい。
この場合、段差が設けられた定盤８の上に、厚肉板材２２と、薄肉板材１２を突き合わせて設置した状態で摩擦攪拌接合を行う。なお、定盤８に設けられている段差の高さは、厚肉板材２２と、薄肉板材１２の板厚差と同じに設定されることで、厚肉板材２２と、薄肉板材１２の表面が同じ高さの状態にセットされる。 Moreover, in the Example, although the case where it had the step part (small diameter part) which piles up a thin part on the thick part side as the to-be-joined member G was shown, as shown in FIG. You may make it friction-stir-join the butt | matching location P in the state which faced | matched the board | plate material (2nd to-be-joined member) 22 and the end surface of the thin board | plate material (1st to-be-joined member) 12 only.
In this case, the friction stir welding is performed in a state in which the thick plate member 22 and the thin plate member 12 are placed in contact with each other on the surface plate 8 provided with a step. The height of the step provided on the surface plate 8 is set to be the same as the plate thickness difference between the thick plate member 22 and the thin plate member 12, so that the surfaces of the thick plate member 22 and the thin plate member 12 are the same. Set to the same height.

１薄肉円筒体（第１被接合部材）
１ａ開口部
２厚肉円筒体（第２被接合部材）
２ａ小径部
３ワーク受けローラ
４センター出し治具
５チャック装置
６電動モータ
７回転ツール
７ａピン
７ｂ電動モータ
８定盤
１０薄肉円筒体（第１被接合部材）
１０ａ開口部
１１薄肉円筒体（第１被接合部材）
１１ａ開口部
１２薄肉板材（第１被接合部材）
２０厚肉円柱体（第２被接合部材）
２０ａ小径部
２１厚肉円筒体（第２被接合部材）
２１ａ厚肉部
２１ｂ小径部
２２厚肉板材（第２被接合部材）
Ｄ基準点の線
ｄ１基準点
ｄ２基準点
Ｅ付き合わせ線
Ｇ被接合部材
Ｋ１接合開始部
Ｋ２接合終了部
Ｍピンの接合中心線
ｍ蛇行させたピンの位置
Ｐ突き合わせ箇所
Ｑ軸心
Ｗオーバーラップしていく範囲
Ｙ溶融部 1 Thin cylindrical body (first member to be joined)
1a Opening 2 Thick cylindrical body (second member to be joined)
2a Small diameter part 3 Work receiving roller 4 Centering jig 5 Chuck device 6 Electric motor 7 Rotating tool 7a Pin 7b Electric motor 8 Surface plate 10 Thin cylindrical body (first member to be joined)
10a Opening 11 Thin cylindrical body (first member to be joined)
11a Opening 12 Thin plate material (first member to be joined)
20 Thick cylinder (second member to be joined)
20a Small diameter part 21 Thick cylindrical body (2nd to-be-joined member)
21a Thick part 21b Small diameter part 22 Thick plate (second member to be joined)
D Reference point line d1 Reference point d2 Reference point E Attachment line G Joined member K1 Join start part K2 Join end part M Pin joint center line m Position of meandering pin P Abutting point Q Axis W W Overlapping Range Y Melting zone

Claims

第１被接合部材の薄肉部と第２被接合部材の厚肉部とを突き合わせて、この突き合わせ箇所の部分に、回転ツールの先端に設けたピンを回転しながら押圧することで発生した摩擦熱で、前記突き合わせ箇所の部分を塑性流動させて両被接合部材同士を接合するようにした摩擦攪拌接合方法であって、
前記ピンの接合開始部は、前記薄肉部と前記厚肉部の突き合わせ線上の位置とし、続いて前記ピンの接合中心線を、前記突き合わせ線に対し、前記ピンによる前記薄肉部と前記厚肉部の溶解部がオーバーラップしていく範囲内で、前記接合開始部から前記薄肉部側を通って前記厚肉部側へ向かうようにピンを蛇行させて前記接合開始部に向かわせた後、前記ピンの接合終了部を前記接合開始部又はこの近傍を通り過ぎた位置であって、この位置における前記接合終了部が先に前記接合開始部から蛇行させた前記ピンの位置より前記厚肉部側にある位置とした、
ことを特徴とする摩擦攪拌接合方法。 Frictional heat generated by abutting the thin part of the first member to be joined and the thick part of the second member to be joined, and pressing the pin provided at the tip of the rotating tool against the part of the abutting part while rotating. Then, a friction stir welding method in which a part of the butt portion is plastically flowed to join both members to be joined,
The joining start part of the pin is positioned on the butt line between the thin part and the thick part, and subsequently, the joining center line of the pin with respect to the butt line is the thin part and the thick part by the pin. In the range where the melted portion overlaps, the pin meanders from the joining start portion to the thick portion side through the thin portion side, and then toward the joining start portion, The position at which the joining end portion of the pin passes the joining start portion or the vicinity thereof, and the joining end portion at this position is closer to the thicker portion than the position of the pin meandered from the joining start portion first. A certain position,
A friction stir welding method characterized by the above.

請求項１に記載の摩擦攪拌接合方法において、
前記第２被接合部材の厚肉部は、第１被接合部の薄肉部を係合可能な段差を有する、
ことを特徴とする摩擦攪拌接合方法。 In the friction stir welding method according to claim 1,
The thick part of the second member to be joined has a step that can engage the thin part of the first part to be joined.
A friction stir welding method characterized by the above.

請求項１又は請求項２に記載の摩擦攪拌接合方法において、
前記第１被接合部材および前記第２被接合部材は円筒状部材である、
ことを特徴とする摩擦攪拌接合方法。 In the friction stir welding method according to claim 1 or 2,
The first member to be joined and the second member to be joined are cylindrical members.
A friction stir welding method characterized by the above.