JP2001205475A - Method of manufacturing for joined joint having excellent fatigue strength - Google Patents
Method of manufacturing for joined joint having excellent fatigue strengthInfo
- Publication number
- JP2001205475A JP2001205475A JP2000017349A JP2000017349A JP2001205475A JP 2001205475 A JP2001205475 A JP 2001205475A JP 2000017349 A JP2000017349 A JP 2000017349A JP 2000017349 A JP2000017349 A JP 2000017349A JP 2001205475 A JP2001205475 A JP 2001205475A
- Authority
- JP
- Japan
- Prior art keywords
- joint
- joining
- fatigue strength
- joined
- tensile force
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、摩擦撹拌接合に
より接合された接合継手であって、疲労強度に優れた接
合継手の製造方法に関し、この製造方法により得られた
接合継手は、例えば、自動車のサスペンションアーム等
の構造部材として好適に用いられる。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a joint which is joined by friction stir welding and has excellent fatigue strength. It is suitably used as a structural member such as a suspension arm.
【０００２】[0002]
【従来の技術】２個の金属製接合部材を接合一体化する
摩擦撹拌接合は、固相接合の一種であるため、熱歪みに
よる変形や割れを生じ難いという利点を有し、近年、溶
融溶接（例えばＭＩＧ、ＴＩＧ、レーザ溶接）やロウ付
けに代わる新しい接合手段として用いられてきている。2. Description of the Related Art Friction stir welding in which two metal joining members are joined and integrated is a type of solid-phase joining, and therefore has the advantage that deformation and cracking due to thermal strain are unlikely to occur. (E.g., MIG, TIG, laser welding) and have been used as new joining means in place of brazing.
【０００３】図５（ａ）〜（ｃ）は、それぞれ摩擦撹拌
接合により接合された接合継手（J4）（J5）（J6）の断
面を示している。これらの図において、（Ｗ）は各接合
継手（J4）（J5）（J6）の接合部を示している。FIGS. 5A to 5C show cross sections of the joints (J4), (J5) and (J6) joined by friction stir welding, respectively. In these figures, (W) indicates the joint of each joint (J4) (J5) (J6).
【０００４】同図（ａ）では、接合継手（J4）は、２個
の板状の接合部材（110）（120）の端面同士を突き合わ
せてこの突合せ部（Ｂ）をその表面から摩擦撹拌接合に
より接合することにより得られたものである。同図
（ａ）において、（130）は帯板状の裏当て材である。
この裏当て材（130）は、摩擦撹拌接合時に発生した摩
擦熱により軟化した軟化部を突合せ部（Ｂ）の裏面から
受けるためのものであって、突合せ部（Ｂ）の裏面に該
突合せ部（Ｂ）に沿って面接触状態に当接している。そ
してこの状態で、裏当て材（130）の一部が突合せ部
（Ｂ）に摩擦撹拌接合により接合され、両接合部材（11
0）（120）と裏当て材（130）が一体化されている。In FIG. 1A, a joint (J4) is formed by abutting end faces of two plate-like joining members (110) and (120), and joining the abutting portion (B) from its surface by friction stir welding. It is obtained by joining by the following. In FIG. 1A, reference numeral (130) denotes a band-shaped backing material.
The backing material (130) is for receiving a softened portion softened by frictional heat generated during friction stir welding from the back surface of the butt portion (B), and is provided on the back surface of the butt portion (B). It is in a surface contact state along (B). Then, in this state, a part of the backing material (130) is joined to the butting portion (B) by friction stir welding, and both joining members (11
0) (120) and backing material (130) are integrated.
【０００５】同図（ｂ）では、接合継手（J5）は、２個
の断面Ｌ字状の接合部材（140）（150）における一方の
板状部（141）（151）の端面同士を、他方の板状部（14
2）（152）同士が重合せ状になるように突き合わせて、
この突合せ部（Ｂ）をその表面から摩擦撹拌接合により
接合することにより得られたものである。In FIG. 1B, a joint (J5) is formed by joining the end faces of one plate-like portion (141) (151) of two joint members (140) (150) having an L-shaped cross section. The other plate (14
2) (152) butts so that they are superposed,
This is obtained by joining the butted portion (B) from its surface by friction stir welding.
【０００６】同図（ｃ）では、接合継手（J6）は、断面
円形のパイプ材からなる第１接合部材（160）の端面
と、断面円形の円柱状の接合部材（170）の端面とを突
き合わせて、この突合せ部（Ｂ）を摩擦撹拌接合により
接合することにより得られたものである。前記第２接合
部材（170）の端面の中央部には、嵌合凸部（171）が軸
線上に一体に設けられている。この嵌合凸部（171）
は、摩擦撹拌接合の際に摩擦撹拌接合用の接合工具（図
示せず）の接合ヘッドの押付け圧を受けて第１接合部材
（160）の端部が変形してしまうことを防止するための
もので、両者の突合せ状態において、この嵌合凸部（17
1）は第１接合部材（160）の一端開口部（161）内にぴ
ったりとあるいは若干きつく嵌合され、これにより第１
接合部材（160）の端部の変形を阻止している。そして
この嵌合状態で、突合せ部（Ｂ）が全周に亘って接合さ
れている。In FIG. 1C, a joint (J6) is formed by joining an end face of a first joining member (160) made of a pipe material having a circular cross section with an end face of a cylindrical joining member (170) having a circular cross section. Butts are obtained by joining the butted portions (B) by friction stir welding. A fitting projection (171) is provided integrally on the axis at the center of the end surface of the second joining member (170). This mating projection (171)
Is for preventing the end of the first joining member (160) from being deformed by the pressing pressure of the joining head of the joining tool (not shown) for friction stir welding during friction stir welding. In the abutting state of both, this fitting convex portion (17
1) fits snugly or slightly tightly into the one end opening (161) of the first joining member (160), whereby the first
The end of the joining member (160) is prevented from being deformed. In this fitting state, the butting portion (B) is joined over the entire circumference.
【０００７】[0007]
【発明が解決しようとする課題】しかしながら、上記３
個の接合継手（J4）（J5）（J6）は、いずれも接合部
（Ｗ）にルート部（Ｒ）を有するものであるから、接合
部（Ｗ）に繰返し応力が生じたときに、このルート部
（Ｒ）から亀裂（Ｃ）が発生する、いわゆるルート割れ
の虞があり、このため、ルート部（Ｒ）からの亀裂
（Ｃ）が生じないよう、接合作業の際に接合条件を厳密
に調節しなければならなかったし、更には接合操作をゆ
っくりと慎重に行わなければならなかったので、接合作
業能率が悪かった。However, the above 3)
Each of the joints (J4), (J5), and (J6) has a root (R) at the joint (W). There is a possibility that a crack (C) is generated from the root portion (R), that is, a so-called root crack. For this reason, the joining conditions are strictly set at the time of the joining operation so that the crack (C) from the root portion (R) does not occur. And the joining operation had to be performed slowly and carefully, resulting in poor joining work efficiency.
【０００８】この発明は、上記のような技術背景に鑑み
てなされたもので、その目的は、簡単な方法で疲労強度
に優れた接合継手を得ることのできる疲労強度に優れた
接合継手の製造方法を提供することにある。The present invention has been made in view of the technical background as described above, and has as its object to manufacture a joint having excellent fatigue strength by which a joint having excellent fatigue strength can be obtained by a simple method. It is to provide a method.
【０００９】[0009]
【課題を解決するための手段】上記目的を達成するた
め、この発明に係る疲労強度に優れた接合継手の製造方
法は、接合部材を摩擦撹拌接合により接合したのち、接
合部に予め引張力を付与することを特徴としている。In order to achieve the above-mentioned object, a method of manufacturing a joint according to the present invention having excellent fatigue strength comprises joining a joining member by friction stir welding, and then applying a tensile force to the joint in advance. It is characterized by giving.
【００１０】すなわち、本発明者は、鋭意研究調査した
結果、接合部材を摩擦撹拌接合により接合してなる接合
継手の接合部に、引張力を付与することにより、該接合
継手の疲労強度が向上することを見出した。That is, as a result of intensive research and investigation, the present inventor has found that, by applying a tensile force to a joint of a joined joint formed by joining the joined members by friction stir welding, the fatigue strength of the joined joint is improved. I found to do.
【００１１】この理由は次のように推測される。つま
り、接合部に予め引張力を付与することにより、亀裂の
先端が丸みを帯びた形状になって亀裂が進展し難くなる
結果、疲労強度が向上すると思われる。あるいはまた、
接合部に付与した引張力を解除する際に生じた圧縮応力
が接合部に残留し、この残留圧縮応力が亀裂の進展を妨
げるように作用する結果、疲労強度が向上すると思われ
る。いずれにしても、この発明によれば、接合部に予め
引張力を付与することにより、疲労強度が向上し、もっ
て疲労強度に優れた接合継手を得ることができるように
なる。The reason is presumed as follows. In other words, it is considered that, by applying a tensile force to the joint in advance, the tip of the crack becomes rounded and the crack becomes difficult to propagate, so that the fatigue strength is improved. Alternatively,
It is considered that the compressive stress generated when the tensile force applied to the joint is released remains in the joint, and the residual compressive stress acts to prevent the growth of the crack, resulting in an increase in fatigue strength. In any case, according to the present invention, by applying a tensile force to the joint portion in advance, the fatigue strength is improved, and a joined joint having excellent fatigue strength can be obtained.
【００１２】また、この発明において、前記引張力は、
前記接合部に生じる引張応力の値が接合部の耐力の５０
〜９０％の範囲内となる大きさであることが望ましい。In the present invention, the tensile force is:
The value of the tensile stress generated at the joint is 50% of the proof stress of the joint.
It is desirable that the size be within the range of 90%.
【００１３】この理由は次の通りである。すなわち、接
合部に生じる引張応力の値が接合部の耐力の５０％未満
となる大きさである場合には、亀裂の進展阻止作用が少
なすぎて、疲労強度を大幅に向上させることが困難にな
る。一方、引張応力の値が接合部の耐力の９０％を超え
る大きさである場合には、接合部に付与する引張力によ
って該接合部に新たに亀裂が生じる虞がある。したがっ
て、前記引張力は、接合部に生じる引張応力の値が接合
部の耐力の５０〜９０％の範囲内となる大きさであるこ
とが望ましい。特に、前記引張力は、接合部に生じる引
張応力の値が接合部の耐力の６０〜８０％の範囲内とな
る大きさであることが、接合継手の疲労強度を大幅に向
上させることができるようになる点で、望ましい。The reason is as follows. That is, when the value of the tensile stress generated in the joint is less than 50% of the proof stress of the joint, the effect of preventing the crack from growing is too small, and it is difficult to significantly improve the fatigue strength. Become. On the other hand, when the value of the tensile stress exceeds 90% of the proof stress of the joint, a new crack may be generated in the joint due to the tensile force applied to the joint. Therefore, it is desirable that the tensile force has such a value that the value of the tensile stress generated in the joint is in the range of 50 to 90% of the proof stress of the joint. In particular, when the tensile force is such that the value of the tensile stress generated in the joint is within the range of 60 to 80% of the proof stress of the joint, the fatigue strength of the joint can be significantly improved. This is desirable.
【００１４】[0014]
【発明の実施の形態】次に、この発明の実施形態を図面
を参照して説明する。Next, an embodiment of the present invention will be described with reference to the drawings.
【００１５】図１において、（J1）はこの発明の第１実
施形態で供される接合継手である。この接合継手（J1）
は、断面円形のアルミニウム合金製パイプ材からなる第
１接合部材（10）の端面と、断面円形の円柱状のアルミ
ニウム合金製第２接合部材（20）の端面とを突き合わせ
てこの突合せ部（Ｂ）を摩擦撹拌接合によって接合（接
合部Ｗ）することにより両接合部材（10）（20）を接合
一体化したものである。したがって、この接合継手（J
1）は、突合せ接合継手の範疇に入るものである。In FIG. 1, (J1) is a joint provided in the first embodiment of the present invention. This joint (J1)
Is formed by abutting an end face of a first joining member (10) made of a pipe material made of an aluminum alloy having a circular cross section with an end face of a second joining member (20) made of an aluminum alloy having a circular cross section. ) Are joined (joining portion W) by friction stir welding to join both joining members (10) and (20) together. Therefore, this joint (J
1) falls under the category of butt joints.
【００１６】まず、この接合継手（J1）の構成を、図３
を参照して接合方法と共に説明する。First, the structure of the joint (J1) is shown in FIG.
And the joining method will be described with reference to FIG.
【００１７】前記第２接合部材（20）の外径寸法は、前
記第１接合部材（10）の外径寸法と同寸に設定されてい
る。また、第２接合部材（20）の端面の中央部には、断
面円形の嵌合凸部（21）が軸線上に一体に設けられてい
る。この嵌合凸部（21）の径は、前記第１接合部材（1
0）の内径寸法と略同寸に設定されている。そして、第
１接合部材（10）の端面と第２接合部材（20）の端面と
が、互いに軸線同士を一致させて突き合わされている。
この突合せ状態において、前記嵌合凸部（21）は第１接
合部材（10）の一端開口部（11）内にぴったりとあるい
は若干きつく嵌合されており、これにより第１接合部材
（10）の端部が嵌合凸部（21）で支持補強されている。
さらに、第１接合部材（10）の外周面と第２接合部材
（20）の外周面とは、面一に連なっている。The outer diameter of the second joint member (20) is set to be the same as the outer diameter of the first joint member (10). A fitting projection (21) having a circular cross section is provided integrally on the axis at the center of the end surface of the second joining member (20). The diameter of the fitting projection (21) is the same as that of the first joining member (1).
It is set to be approximately the same as the inner diameter of 0). The end face of the first joining member (10) and the end face of the second joining member (20) are butted with their axes coincident with each other.
In this abutting state, the fitting projection (21) is fitted tightly or slightly tightly into the one end opening (11) of the first joining member (10), thereby forming the first joining member (10). Are supported and reinforced by fitting projections (21).
Further, the outer peripheral surface of the first joining member (10) and the outer peripheral surface of the second joining member (20) are flush with each other.
【００１８】同図において、（80）は摩擦撹拌接合用の
接合工具であって、径大の円柱状回転子（81）と、該回
転子（81）の端面（81a）軸線上に突設された径小のピ
ン状プローブ（82）とからなる接合ヘッド（83）を備え
ている。In the figure, reference numeral (80) denotes a welding tool for friction stir welding, which has a large-diameter cylindrical rotor (81) and protrudes from an end face (81a) axis of the rotor (81). And a joining head (83) including a pin-shaped probe (82) having a small diameter.
【００１９】この接合工具（80）を用い、回転子（81）
を回転させてプローブ（82）を回転させながら、該プロ
ーブ（82）を突合せ部（Ｂ）に外周面から挿入するとと
もに、回転子（81）の端面（81a）を突合せ部（Ｂ）の
外周面に押し付ける。このとき、第１接合部材（10）の
一端開口部（11）内には、上述したように嵌合凸部（2
1）が嵌合されて該第１接合部材（10）の端部が支持補
強されているから、このような接合ヘッド（83）の押付
け圧を受けても第１接合部材（10）の端部が変形する虞
はない。この状態で、プローブ（82）を突合せ部（Ｂ）
に沿って接合部材（10）（20）の周方向に移動させ、あ
るいは接合ヘッド（83）の位置を固定しておいて突合せ
部（Ｂ）が順次プローブ（82）を通過するように両接合
部材（10）（20）をその軸線を中心に回転させる。これ
により突合せ部（Ｂ）が全周に亘って接合され、もって
両接合部材（10）（20）が接合一体化される。Using this joining tool (80), a rotor (81)
While rotating the probe (82) by rotating the probe (82), the probe (82) is inserted into the butting portion (B) from the outer peripheral surface, and the end face (81a) of the rotor (81) is connected to the outer periphery of the butting portion (B). Press on the surface. At this time, as described above, the fitting protrusion (2) is provided in the one end opening (11) of the first joining member (10).
1) is fitted and the end of the first joining member (10) is supported and reinforced, so that even if the pressing pressure of the joining head (83) is received, the end of the first joining member (10) is There is no danger of the part being deformed. In this state, the probe (82) is connected to the butt (B).
Move the joining members (10) and (20) in the circumferential direction, or fix the position of the joining head (83) so that the butting portion (B) passes through the probe (82) sequentially. The members (10) and (20) are rotated about their axes. As a result, the butted portion (B) is joined over the entire circumference, and thus both joining members (10) and (20) are joined and integrated.
【００２０】こうして得られた接合継手（J1）において
は、第１接合部材（10）の端部と嵌合凸部（21）との界
面がルート部（Ｒ）となる。また、接合部（Ｗ）は、突
合せ部（Ｂ）に全周に亘って形成されており、且つ突合
せ部（Ｂ）の表面から第１接合部材（10）の端部の内周
面に及ぶ深さ領域まで形成されている。In the joint (J1) thus obtained, the interface between the end of the first joint member (10) and the fitting projection (21) becomes the root (R). The joining portion (W) is formed over the entire periphery of the butting portion (B), and extends from the surface of the butting portion (B) to the inner peripheral surface at the end of the first joining member (10). It is formed up to the depth region.
【００２１】この実施形態では、上記の接合継手（J1）
の接合部（Ｗ）に予め引張力を付与することにする。In this embodiment, the above joint (J1)
A tensile force is applied in advance to the joint (W).
【００２２】まず、引張試験機等の市販されている荷重
付与装置（図示せず）を用い、該荷重付与装置に備えら
れた掴み部で接合継手（J1）の一端部と他端部とを掴ん
で軸線方向に引っ張る（引張方向イ）ことにより、接合
継手（J1）の接合部（Ｗ）に引張力を付与する。これに
より、該接合継手（J1）の接合部（Ｗ）に引張応力が均
一に生じる。ここで、接合継手（J1）の接合部（Ｗ）に
該接合部の耐力の５０〜９０％の範囲内の大きさの引張
応力が生じるように、接合部（Ｗ）に引張力を付与する
ことが望ましい。特に、接合継手（J1）の接合部（Ｗ）
に該接合部の耐力の６０〜８０％の範囲内の大きさの引
張応力が生じるように、接合部（Ｗ）に引張力を付与す
ることが望ましい。なお、この実施形態の接合継手（J
1）は、上述したようにアルミニウム合金製の第１及び
第２接合部材（10）（20）が接合一体化されたものから
なるので、その接合部（Ｗ）は、降伏点が明瞭に現れな
い。したがって、この実施形態の接合継手（J1）では、
接合部（Ｗ）の耐力として、０．２％の永久伸びを生じ
る応力の値（いわゆる、σ0.2）が用いられることにな
る。First, using a commercially available load applying device (not shown) such as a tensile tester, one end and the other end of the joint (J1) are gripped by a grip provided on the load applying device. By grasping and pulling in the axial direction (tensile direction a), a tensile force is applied to the joint (W) of the joint (J1). As a result, a tensile stress is uniformly generated at the joint (W) of the joint (J1). Here, a tensile force is applied to the joint (W) such that a tensile stress having a magnitude within the range of 50 to 90% of the proof stress of the joint is generated at the joint (W) of the joint (J1). It is desirable. In particular, the joint (W) of the joint (J1)
Preferably, a tensile force is applied to the joint (W) so that a tensile stress having a magnitude within a range of 60 to 80% of the proof stress of the joint is generated. In addition, the joint (J
1) Since the first and second joining members (10) and (20) made of aluminum alloy are joined and integrated as described above, the joint (W) clearly shows a yield point at the joining portion (W). Absent. Therefore, in the joint (J1) of this embodiment,
As the proof stress of the joint (W), a value of a stress (so-called σ 0.2 ) that causes a permanent elongation of 0.2% is used.
【００２３】このように接合部（Ｗ）に引張力を付与し
た後、引張力を解除する。このとき、引張力を付与した
直後に引張力を解除しても良いし、少しの時間（望まし
くは０〜１秒間）維持してから引張力を解除しても良
い。After the tensile force is applied to the joint (W), the tensile force is released. At this time, the tensile force may be released immediately after the tensile force is applied, or may be maintained for a short time (preferably 0 to 1 second) and then released.
【００２４】以上の引張力付与−解除工程を少なくとも
１回行うことにより、接合継手（J1）の疲労強度が向上
し、もって疲労強度に優れた接合継手を得ることができ
るようになる。By performing the above-described tensile force applying / releasing step at least once, the fatigue strength of the joint (J1) is improved, and a joint having excellent fatigue strength can be obtained.
【００２５】図４（ａ）において、（J2）はこの発明の
第２実施形態で供される接合継手である。この接合継手
（J2）は、上記従来例の図５（ａ）に示した接合継手
（J4）と同じ構成のもので、この構成を簡単に説明する
と、２個の板状の接合部材（30）（40）の端面同士を突
き合わせてこの突合せ部（Ｂ）をその表面から摩擦撹拌
接合により接合することにより得られたものである。
（50）は帯板状の裏当て材である。In FIG. 4A, (J2) is a joint provided in the second embodiment of the present invention. This joint (J2) has the same structure as the joint (J4) shown in FIG. 5 (a) of the above-mentioned conventional example. To briefly explain this structure, two plate-like joint members (30 (40) The end faces of (40) are abutted to each other and the butted portion (B) is joined from the surface thereof by friction stir welding.
(50) is a strip-shaped backing material.
【００２６】この接合継手（J2）の場合には、接合継手
（J2）の接合部（Ｗ）に引張力を付与することにより、
疲労強度に優れた接合継手を得ることができる。In the case of this joint (J2), by applying a tensile force to the joint (W) of the joint (J2),
A joint joint having excellent fatigue strength can be obtained.
【００２７】図４（ｂ）において、（J3）はこの発明の
第３実施形態で供される接合継手である。この接合継手
（J3）は、上記従来例の図５（ｂ）に示した接合継手
（J5）と同じ構成のもので、この構成を簡単に説明する
と、２個の断面Ｌ字状の接合部材（60）（70）における
一方の板状部（61）（71）の端面同士を、他方の板状部
（62）（72）同士が重合せ状になるように突き合わせ
て、この突合せ部（Ｂ）をその表面から摩擦撹拌接合に
より接合することにより得られたものである。In FIG. 4B, (J3) is a joint provided in the third embodiment of the present invention. This joint (J3) has the same structure as the joint (J5) shown in FIG. 5 (b) of the above-mentioned conventional example. To briefly explain this structure, two joint members having an L-shaped cross section are used. (60) The end faces of the plate-shaped portions (61) and (71) in (70) are butted so that the other plate-shaped portions (62) and (72) overlap each other. B) was obtained by joining from the surface thereof by friction stir welding.
【００２８】この接合継手（J3）の場合にも、接合継手
（J3）の接合部（Ｗ）に引張力を付与することにより、
疲労強度に優れた接合継手を得ることができる。Also in the case of the joint (J3), by applying a tensile force to the joint (W) of the joint (J3),
A joint joint having excellent fatigue strength can be obtained.
【００２９】以上、この発明の実施形態を説明したが、
この発明に係る製造方法に供される接合継手は、上記実
施形態のものに限定されず、例えばＴ継手（図示せず）
やフレア継手（図示せず）であっても良い。The embodiment of the present invention has been described above.
The joint joint provided for the manufacturing method according to the present invention is not limited to the one in the above embodiment, and is, for example, a T joint (not shown).
Or a flare joint (not shown).
【００３０】[0030]
【評価例】次に、この発明の具体的評価例を示す。この
評価例では、図１に示した上記第１実施形態の接合継手
（J1）の接合部（Ｗ）に引張力を付与することにより、
疲労強度に優れた接合継手を製造することとした。[Evaluation Examples] Next, specific evaluation examples of the present invention will be described. In this evaluation example, by applying a tensile force to the joint (W) of the joint (J1) of the first embodiment shown in FIG.
It was decided to manufacture a joint having excellent fatigue strength.
【００３１】以下に示す各実施例１〜５及び比較例１に
おいて、使用した第１接合部材（10）は、いずれも外径
２２ｍｍ、肉厚４ｍｍのアルミニウム合金製のものであ
る。一方、第２接合部材（20）は、第１接合部材（10）
と同じくアルミニウム合金製であって、その外径寸法は
第１接合部材（10）の外径寸法と同寸であり、また嵌合
凸部（21）の径は第１接合部材（10）の内径寸法と略同
寸で、この嵌合凸部（21）が第１接合部材（10）の一端
開口部（11）内にぴったりと嵌合されている。他の構成
は、上記第１実施形態のものと同一である。In each of the following Examples 1 to 5 and Comparative Example 1, the first joining member (10) used was made of an aluminum alloy having an outer diameter of 22 mm and a wall thickness of 4 mm. On the other hand, the second joining member (20) is the first joining member (10).
, The outer diameter of which is the same as the outer diameter of the first joining member (10), and the diameter of the fitting projection (21) is the same as that of the first joining member (10). The fitting projection (21) is approximately the same size as the inner diameter, and is fitted exactly into the one end opening (11) of the first joining member (10). Other configurations are the same as those of the first embodiment.
【００３２】＜実施例１＞実施例１では、接合部に接合
部の耐力の５０％の引張応力が生じるように接合部に引
張力を１回付与した。Example 1 In Example 1, a tensile force was applied once to the joint so that a tensile stress of 50% of the proof stress of the joint was generated at the joint.
【００３３】＜実施例２＞実施例２では、接合部に接合
部の耐力の６０％の引張応力が生じるように、接合部に
引張力を１回付与した。Example 2 In Example 2, a tensile force was applied once to the joint so that a tensile stress of 60% of the proof stress of the joint was generated at the joint.
【００３４】＜実施例３＞実施例３では、接合部に接合
部の耐力の７０％の引張応力が生じるように、接合部に
引張力を１回付与した。Example 3 In Example 3, a tensile force was applied to the joint once so that a tensile stress of 70% of the proof stress of the joint was generated in the joint.
【００３５】＜実施例４＞実施例４では、接合部に接合
部の耐力の８０％の引張応力が生じるように、接合部に
引張力を１回付与した。Example 4 In Example 4, a tensile force was applied once to the joint so that a tensile stress of 80% of the proof stress of the joint was generated at the joint.
【００３６】＜実施例５＞実施例５では、接合部に接合
部の耐力の９０％の引張応力が生じるように、接合部に
引張力を１回付与した。<Example 5> In Example 5, a tensile force was applied once to the joint so that a tensile stress of 90% of the proof stress of the joint was generated at the joint.
【００３７】＜比較例１＞比較例１では、接合部に引張
力を付与しなかった。Comparative Example 1 In Comparative Example 1, no tensile force was applied to the joint.
【００３８】以上の実施例１〜５及び比較例１の接合継
手の疲労寿命をそれぞれ評価した。その結果を表１に示
す。同表において、疲労寿命Ｎ*の値は、各疲労寿命を
比較例１の接合継手の疲労寿命で割った値を示してい
る。The fatigue life of the joints of Examples 1 to 5 and Comparative Example 1 was evaluated. Table 1 shows the results. In the table, the value of the fatigue life N * indicates a value obtained by dividing each fatigue life by the fatigue life of the joint of Comparative Example 1.
【００３９】[0039]
【表１】 なお、疲労寿命の試験は、接合継手の接合部に両振り応
力が生じるように接合継手に繰返し荷重を加えることに
より、遂行した。その条件は次の通りである。 ＜疲労寿命の試験条件＞ ・繰返し荷重 Ｐ＝±１４．７ｋＮ ・最小最大応力比 Ｒ＝−１ 表１に示すように、実施例１〜５によれば、接合継手の
疲労寿命が長くなることが分かった。したがって、接合
部に接合部の耐力の５０〜９０％の範囲内の引張応力が
生じるように接合部に引張力を付与することにより、接
合継手の疲労寿命が長くなること、つまり接合継手の疲
労強度が向上することを確認し得た。特に、同表に示す
ように実施例２〜４によれば、接合継手の疲労寿命が格
段に長くなることが分かった。したがって、接合部に接
合部の耐力の６０〜８０％の範囲内の引張応力が生じる
ように接合部に引張力を付与することにより、接合継手
の疲労寿命が格段に長くなること、つまり接合継手の疲
労強度がより一層向上することを確認し得た。[Table 1] In addition, the test of the fatigue life was performed by repeatedly applying a load to the joint so that a swinging stress was generated at the joint of the joint. The conditions are as follows. <Test conditions for fatigue life> • Cyclic load P = ± 14.7 kN • Minimum to maximum stress ratio R = -1 As shown in Table 1, according to Examples 1 to 5, the fatigue life of the joint was increased. I understood. Therefore, by applying a tensile force to the joint so as to generate a tensile stress in the range of 50 to 90% of the proof stress of the joint at the joint, the fatigue life of the joint is extended, that is, the fatigue of the joint is increased. It was confirmed that the strength was improved. In particular, as shown in the table, according to Examples 2 to 4, it was found that the fatigue life of the joint was significantly increased. Therefore, by applying a tensile force to the joint so as to generate a tensile stress in the range of 60 to 80% of the proof stress of the joint at the joint, the fatigue life of the joint is significantly increased, that is, the joint is reduced. It was confirmed that the fatigue strength was further improved.
【００４０】[0040]
【発明の効果】上述の次第で、この発明によれば、接合
部材を摩擦撹拌接合により接合したのち、接合部に予め
引張力を付与することにより、接合継手の疲労強度を向
上させることができるから、疲労強度に優れた接合継手
を簡単な方法で得ることができる。したがって、この発
明に係る製造方法により得られた接合継手は、高い疲労
強度が要求される構造部材（例えば、自動車のサスペン
ションアーム）に特に好適に用いることができる。As described above, according to the present invention, the fatigue strength of the joint can be improved by applying a tensile force to the joint after joining the joining members by friction stir welding. Accordingly, a joint having excellent fatigue strength can be obtained by a simple method. Therefore, the bonded joint obtained by the manufacturing method according to the present invention can be particularly suitably used for a structural member (for example, a suspension arm of an automobile) requiring high fatigue strength.
【００４１】また、前記引張力は、前記接合部に生じる
引張応力の値が接合部の耐力の５０〜９０％の範囲内の
大きさである場合には、接合継手の疲労強度を確実に且
つ大幅に向上させることができる。[0041] When the value of the tensile stress generated in the joint is within the range of 50% to 90% of the proof stress of the joint, the tensile force reliably and reliably reduces the fatigue strength of the joint. It can be greatly improved.
【図１】（ａ）はこの発明の第１実施形態に供される接
合継手の斜視図、（ｂ）は同接合継手の断面図である。FIG. 1A is a perspective view of a joint provided in a first embodiment of the present invention, and FIG. 1B is a cross-sectional view of the joint.
【図２】同接合継手の接合部に引張力を付与する途中の
状態の断面図である。FIG. 2 is a cross-sectional view illustrating a state in which a tensile force is applied to a joint of the joint.
【図３】（ａ）は同接合継手を接合途中の状態で示す斜
視図、（ｂ）は断面図である。3 (a) is a perspective view showing the same joint in the middle of joining, and FIG. 3 (b) is a sectional view.
【図４】（ａ）はこの発明の第２実施形態に供される接
合継手の断面図、（ｂ）はこの発明の第３実施形態に供
される接合継手の断面図である。4A is a cross-sectional view of a joint provided in a second embodiment of the present invention, and FIG. 4B is a cross-sectional view of a joint provided in a third embodiment of the present invention.
【図５】（ａ）〜（ｃ）は、それぞれ従来の接合継手の
欠点を説明するために用いられた接合継手の断面図であ
る。FIGS. 5A to 5C are cross-sectional views of a joint used to explain the disadvantages of the conventional joint.
J1、J2、J3…接合継手 10、20、30、40、60、70…接合部材 Ｗ…接合部 Ｂ…突合せ部 J1, J2, J3… Joint joints 10, 20, 30, 40, 60, 70… Joint members W… Joints B… But joints
Claims (2)
のち、接合部（Ｗ）に予め引張力を付与することを特徴
とする疲労強度に優れた接合継手の製造方法。1. A method for manufacturing a joint having excellent fatigue strength, comprising: applying a tensile force to a joint (W) in advance after joining the joining members by friction stir welding.
応力の値が接合部の耐力の５０〜９０％の範囲内となる
大きさである請求項１記載の疲労強度に優れた接合継手
の製造方法。2. The joint according to claim 1, wherein the tensile force is such that the value of the tensile stress generated in the joint is within a range of 50 to 90% of the proof stress of the joint. Manufacturing method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000017349A JP4732559B2 (en) | 2000-01-26 | 2000-01-26 | Manufacturing method of joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000017349A JP4732559B2 (en) | 2000-01-26 | 2000-01-26 | Manufacturing method of joint |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001205475A true JP2001205475A (en) | 2001-07-31 |
| JP4732559B2 JP4732559B2 (en) | 2011-07-27 |
Family
ID=18544355
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000017349A Expired - Lifetime JP4732559B2 (en) | 2000-01-26 | 2000-01-26 | Manufacturing method of joint |
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| Country | Link |
|---|---|
| JP (1) | JP4732559B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012093680A1 (en) * | 2011-01-06 | 2012-07-12 | カルソニックカンセイ株式会社 | Friction stir bonding method |
| CN105226479A (en) * | 2015-09-28 | 2016-01-06 | 平高集团有限公司 | A kind of preparation method of tubular type conducting rod, hydraulic bulging device and tubular type conducting rod |
| JP2018069325A (en) * | 2016-11-04 | 2018-05-10 | 日本軽金属株式会社 | Joining method |
| WO2021180627A1 (en) * | 2020-03-10 | 2021-09-16 | Lisa Dräxlmaier GmbH | Friction welding connector and its method of production |
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| JPS50115640A (en) * | 1974-02-25 | 1975-09-10 | ||
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| JPH02160170A (en) * | 1988-12-07 | 1990-06-20 | Rhodia Ag | Making of warp beam and |
| JPH05255735A (en) * | 1992-03-11 | 1993-10-05 | Nippon Steel Corp | Improvement of fatigue strength of weld zone of rail |
| JPH08332588A (en) * | 1995-06-08 | 1996-12-17 | Nippon Steel Corp | Method for improving resistance to horizontal crack in welded zone of rail stem |
| JPH10230373A (en) * | 1997-02-21 | 1998-09-02 | Showa Alum Corp | Joining method for metal stock |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012093680A1 (en) * | 2011-01-06 | 2012-07-12 | カルソニックカンセイ株式会社 | Friction stir bonding method |
| CN105226479A (en) * | 2015-09-28 | 2016-01-06 | 平高集团有限公司 | A kind of preparation method of tubular type conducting rod, hydraulic bulging device and tubular type conducting rod |
| JP2018069325A (en) * | 2016-11-04 | 2018-05-10 | 日本軽金属株式会社 | Joining method |
| WO2021180627A1 (en) * | 2020-03-10 | 2021-09-16 | Lisa Dräxlmaier GmbH | Friction welding connector and its method of production |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4732559B2 (en) | 2011-07-27 |
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