JP2007229719A - Tube end sealing method - Google Patents

Tube end sealing method Download PDF

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JP2007229719A
JP2007229719A JP2006050510A JP2006050510A JP2007229719A JP 2007229719 A JP2007229719 A JP 2007229719A JP 2006050510 A JP2006050510 A JP 2006050510A JP 2006050510 A JP2006050510 A JP 2006050510A JP 2007229719 A JP2007229719 A JP 2007229719A
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tube
lid
sealing method
end sealing
tube end
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Makoto Nishimura
誠 西村
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Hitachi Ltd
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Hitachi Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To improve joining quality so that friction welding can be performed by properly holding heat balance in an abutting part between a tube and a cover. <P>SOLUTION: In the abutting part between the tube 1 and the cover 2, there is formed an annular projection 10 having nearly the same cross section size as the tube 1. Friction welding is performed by abutting this annular projection 10 and the tube 1, wherein a flash 13 then produced is released to a release groove 12 preliminarily formed around the boss 3 of the cover 2. Since the annular projection 10 and the tube 1 having a roughly equal thickness are friction welded, heat balance is improved in the abutting part between the cover 2 and the tube 1. As a result, a nearly equal amount of flashes 13, 14 is produced from the cover and the tube, enabling improved joining quality to be obtained. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、管体の一端に蓋体を摩擦圧接して管端を封口する管端封口方法に係り、特に摩擦圧接に際して生じる内側のばりの逃げを有する継手により両者を接合する管端封口方法に関する。   The present invention relates to a tube end sealing method in which a lid is friction-welded to one end of a tube body to seal the tube end, and in particular, a tube end sealing method in which both are joined by a joint having an internal flash relief generated during friction welding. About.

管体と蓋体との摩擦圧接に際して生じる内側のばり（以下、内ばりという）の逃げを有する継手は、従来より知られている（例えば、非特許文献１参照）。図６および図７は、そのような継手を示したもので、管体１の一端に摩擦圧接される蓋体２には、管体１にわずかのクリアランスで嵌入されるボス部（先端ボス部）３が設けられると共に、該ボス部３の周りには環状の逃げ溝４が設けられている。摩擦圧接に際しては、図６に示されるように、管体１にボス部３を嵌入させながら蓋体２が管体１に突合わされ、この状態で両者が相対回転されて摩擦圧接される。すると、図７に示されるように、摩擦圧接に際して生じた内ばり５が前記ボス部３の逃げ溝４に逃げ込み、これによって管体１の内部に内ばり５が露出することはなくなり、管体１の内面品質が確保される。   A joint having a relief of an inner beam (hereinafter referred to as an inner beam) generated at the time of friction welding between a tube body and a lid is conventionally known (see, for example, Non-Patent Document 1). FIGS. 6 and 7 show such a joint. A boss portion (tip boss portion) fitted into the tube body 1 with a slight clearance is attached to the lid body 2 that is friction-welded to one end of the tube body 1. ) 3 is provided, and an annular relief groove 4 is provided around the boss 3. In the friction welding, as shown in FIG. 6, the lid body 2 is abutted against the tube body 1 while the boss portion 3 is fitted into the tube body 1, and in this state, both of them are relatively rotated and subjected to friction welding. Then, as shown in FIG. 7, the inner beam 5 generated at the time of the friction welding is escaped into the escape groove 4 of the boss portion 3, thereby preventing the inner beam 5 from being exposed inside the tube 1. 1 inner surface quality is ensured.

ところで、管体１と蓋体２とを突合せて摩擦圧接すると、両者の突合せ部におけるヒートバランスが悪いため、蓋体２側からあまりばりが出ず、接合部にブローホールや介在物などの欠陥が生じ易くなる。特に管体１および蓋体２がアルミニウム系材料からなる場合は、ヒートバランスが極端に悪化し、前記した欠陥が顕著になって所望の接合品質を安定して得ることは困難になる。なお、例えば、特許文献１には、蓋体の端面に環状突起を形成し、該突起を管体に突合せて摩擦圧接を行うようにしているが、前記突起の厚さが管体の肉厚よりも薄いため、ヒートバランスの悪化は避けられず、前記同様に良好な接合は望めない。   By the way, when the tube body 1 and the lid body 2 are butted against each other and friction welded, the heat balance at the butted portion of the both is poor, so that there is not much flash from the lid body 2 side, and defects such as blow holes and inclusions are present at the joint portion. Is likely to occur. In particular, when the tube body 1 and the lid body 2 are made of an aluminum-based material, the heat balance is extremely deteriorated, and the above-described defects become conspicuous, making it difficult to stably obtain a desired bonding quality. For example, in Patent Document 1, an annular protrusion is formed on the end surface of the lid, and the protrusion is abutted against the tube to perform friction welding. The thickness of the protrusion is the thickness of the tube. Since it is thinner than this, deterioration of heat balance is inevitable, and good bonding cannot be expected as described above.

「摩擦圧接」摩擦圧接研究会編、コロナ社、昭和５４年５月１０日発行、１１２頁“Friction Welding”, Friction Welding Study Group, Corona, May 10, 1979, page 112 特開２００４−１５４８２６号公報JP 2004-154826 A

本発明は、上記した従来技術の問題点に鑑みてなされたもので、その課題とするところは、管体と蓋体との突合せ部におけるヒートバランスを良好に保って摩擦圧接を行うことができるように、もって所望の接合品質の確保に大きく寄与する管端封口方法を提供することにある。   The present invention has been made in view of the above-described problems of the prior art, and the problem is that friction welding can be performed while maintaining a good heat balance at the butt portion between the tube and the lid. Thus, an object of the present invention is to provide a tube end sealing method that greatly contributes to ensuring desired joining quality.

上記課題を解決するため、本発明は、管体の一端に蓋体を摩擦圧接して管端を封口する方法であって、前記摩擦圧接に際して生じる内側のばりを、前記蓋体の、前記管体に嵌入されるボス部の周りの逃げ溝に逃がす管端封口方法において、前記管体に対する前記蓋体の突合せ部に、前記管体と断面サイズが類似の環状突起を予め形成し、該環状突起と前記管体とを突合せて摩擦圧接することを特徴とする。   In order to solve the above-mentioned problem, the present invention is a method of sealing a tube end by friction welding a lid to one end of a tube, wherein an inner flash generated during the friction welding is used as the tube of the lid. In a tube end sealing method in which it escapes into a relief groove around a boss portion to be fitted into a body, an annular protrusion having a cross-sectional size similar to that of the tube body is formed in advance at a butt portion of the lid body with respect to the tube body, The protrusion and the tube are butted against each other and friction welded.

このように行う管端封口方法においては、断面サイズが類似の蓋体側の環状突起と管体とを突合せて摩擦圧接するので、蓋体と管体との突合せ部におけるヒートバランスは良好となり、両者からほぼ同量のばりが生じて良好な接合品質が得られるようになる。   In the tube end sealing method performed in this way, since the annular projection on the lid side having a similar cross-sectional size and the tube body are abutted against each other and friction welded, the heat balance at the abutting portion between the lid body and the tube body becomes good. As a result, almost the same amount of flash is generated, and good bonding quality can be obtained.

本発明において、上記蓋体に形成する環状突起の高さは、少なくとも摩擦圧接時の片側寄り代と同じ大きさに設定するのが望ましく、これにより両者に生じるばり量は等しくなり、接合品質はより一層向上する。   In the present invention, it is desirable to set the height of the annular protrusion formed on the lid body to be at least the same size as the margin on one side at the time of friction welding, and the amount of flash generated in both is equal, and the joining quality is Further improvement.

本発明において、上記蓋体のボス部の周りの逃げ溝は、該ボスの外周縁部から筒状に起立させた起立片を半径外方へカール加工することにより形成されるようにすることができる。このように起立片を半径外方へカール加工することで、蓋体に予め形成した環状突起と協働して簡単に逃げ溝を形成することができる。この場合、前記カール加工として、起立片の軸に対して傾斜して配置された自転可能なカール型を、前記軸中心に揺動回転させながら前記起立片に接近させる揺動回転方式を採用するの望ましく、これにより起立片のカール加工を、クラックなどの不具合を発生させることなく円滑に行うことができる。   In the present invention, the clearance groove around the boss portion of the lid body may be formed by curling a standing piece raised in a cylindrical shape from the outer peripheral edge portion of the boss outward in the radius. it can. In this way, by curling the standing piece outward in the radius, it is possible to easily form the relief groove in cooperation with the annular protrusion formed in advance on the lid. In this case, as the curling process, an oscillating rotation method is adopted in which a self-rotating curl mold that is inclined with respect to the axis of the upright piece is moved closer to the upright piece while being rotated about the axis. This makes it possible to smoothly carry out the curling of the upright piece without causing defects such as cracks.

本発明において、上記管体および蓋体の材種は任意であるが、従来の摩擦圧接では接合困難であったアルミニウム系材料を選択する場合に、極めて有用となる。   In the present invention, the material types of the tube body and the lid body are arbitrary, but it is extremely useful when selecting an aluminum-based material that is difficult to join by conventional friction welding.

本発明において、上記管体および蓋体の用途は任意であるが、単筒式油圧緩衝器のシリンダに適用する場合は、前記管体は、シリンダを構成するチューブとして、前記蓋体は、前記シリンダの一端を閉じるエンドキャップとしてそれぞれ供される。   In the present invention, the use of the tube and the lid is arbitrary, but when applied to a cylinder of a single cylinder hydraulic shock absorber, the tube is a tube constituting the cylinder, and the lid is It serves as an end cap that closes one end of the cylinder.

本発明に係る管端の封口方法によれば、管体と蓋体との突合せ部におけるヒートバランスを良好に保って摩擦圧接を行うことができるので、良好な接合品質を確保することでき、特にアルミニウム系材料からなる管体と蓋体との摩擦圧接に向けて極めて有用となる。   According to the sealing method of the tube end according to the present invention, it is possible to perform the friction welding while maintaining a good heat balance in the butt portion between the tube body and the lid body, it is possible to ensure good bonding quality, in particular This is extremely useful for friction welding between a tube body made of an aluminum-based material and a lid body.

以下、本発明を実施するための最良の形態を添付図面に基づいて説明する。   The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.

図１は、本発明の１つの実施形態を示したものである。本実施形態は、管体１の一端に蓋体２を摩擦圧接して管端を封口するもので、管体１および蓋体２の全体的形状は、前出図６に示したものと同じであるので、ここでは、同一符号を用いることとする。本実施形態において、管体１の外径Ｄ１と蓋体２の外径Ｄ２とは同じ大きさに設定されており、両者は、外径を整合させて同心に突合わされるようになっている。しかして、管体１に対する蓋体２の突合せ部には環状突起１０が形成されている。この環状突起の肉厚ｔ２は、管体１の肉厚ｔ１とほぼ同じ厚さに設定されており、したがって、この環状突起１０は、管体１とほぼ同じ断面サイズとなっている。また、蓋体２のボス部３の先端にはフランジ部１１が一体に形成されており、ボス部３の周りには、このフランジ部１１と前記環状突起１０と協働して、前記逃げ溝４（図６、７）と同じ機能を有する逃げ溝１２が形成されている。   FIG. 1 illustrates one embodiment of the present invention. In this embodiment, the lid 2 is friction-welded to one end of the tube 1 to seal the tube end, and the overall shapes of the tube 1 and the lid 2 are the same as those shown in FIG. Therefore, the same reference numerals are used here. In the present embodiment, the outer diameter D1 of the tube body 1 and the outer diameter D2 of the lid body 2 are set to the same size, and both are concentrically butted with the outer diameters aligned. . Thus, an annular protrusion 10 is formed at the abutting portion of the lid body 2 with respect to the tube body 1. The wall thickness t2 of the annular protrusion is set to be substantially the same as the wall thickness t1 of the tube 1, and thus the annular protrusion 10 has substantially the same cross-sectional size as the tube 1. Further, a flange portion 11 is integrally formed at the tip of the boss portion 3 of the lid body 2, and the relief groove is formed around the boss portion 3 in cooperation with the flange portion 11 and the annular protrusion 10. 4 (FIGS. 6 and 7) is formed with a clearance groove 12 having the same function.

本実施形態において、蓋体２に形成された環状突起１０の高さＡは、少なくとも摩擦圧接時の片側寄り代（全寄り代の半分）となるようにその大きさが設定されている。すなわち、環状突起１０の高さＡは、片側寄り代が３ｍｍの場合には３ｍｍ以上に、片側寄り代が５ｍｍの場合は５ｍｍ以上にそれぞれ設定される。また、逃げ溝１２の底面を画定するボス部３の外径ｄ３は、摩擦圧接時に生じる内ばり１３（同図（Ｃ））の体積を考慮して、該内ばり１３の体積よりも逃げ溝１２の容積が大きくなるように設定されている。一方、この逃げ溝１２を形成するボス部３の先端のフランジ部１１の外径ｄ２は、管体１の内径ｄ１よりもわずか小径となっている（一例として、ｄ１−ｄ２＝０.４ｍｍ）。これにより管体１と蓋体２とを同心に突合わせた状態で、管体１の内面とフランジ部１１の外周面との間には、同図（Ｂ）に示されるようにわずかのクリアランスＳ（ここでは、０.２ｍｍ）が形成される。さらに、このフランジ部１１の板厚ｅは、前記逃げ溝１２内に逃げ込む内ばり１３からの圧力に耐える最小限の厚さに設定される。一例として、この板厚ｅは、管体１および蓋体２がアルミニウム系材料からなる場合、肉厚ｔ１の１／２程度とすれば十分である。   In the present embodiment, the height A of the annular protrusion 10 formed on the lid 2 is set so as to be at least one side margin (half of the total margin) at the time of friction welding. That is, the height A of the annular protrusion 10 is set to 3 mm or more when the one-side margin is 3 mm, and is set to 5 mm or more when the one-side margin is 5 mm. Further, the outer diameter d3 of the boss portion 3 that defines the bottom surface of the escape groove 12 is set so that the volume of the inner beam 13 (FIG. 3C) generated at the time of the friction welding is taken into consideration than the volume of the inner beam 13. The volume of 12 is set to be large. On the other hand, the outer diameter d2 of the flange portion 11 at the tip of the boss portion 3 that forms the escape groove 12 is slightly smaller than the inner diameter d1 of the tube body 1 (as an example, d1-d2 = 0.4 mm). . Thus, with the tube body 1 and the lid body 2 concentrically butting, a slight clearance is provided between the inner surface of the tube body 1 and the outer peripheral surface of the flange portion 11 as shown in FIG. S (here, 0.2 mm) is formed. Furthermore, the plate thickness e of the flange portion 11 is set to a minimum thickness that can withstand the pressure from the inner beam 13 that escapes into the escape groove 12. As an example, when the tube body 1 and the lid body 2 are made of an aluminum-based material, it is sufficient that the plate thickness e is about ½ of the wall thickness t1.

ここで、上記蓋体２のボス部３に対するフランジ部１１の形成は、図２に示されるように、該ボス３の外周縁部から筒状に起立させた起立片１５を半径外方へカール加工することにより形成される。本実施形態において、前記カール加工としては揺動回転方式を採用している。この揺動回転方式のカール加工は、同図に示されるように、起立片１５の軸Ｏ１に対して軸Ｏ２を所定の角度（揺動角度）θだけ傾斜して配置された自転可能なカール型１６を、前記起立片１５の軸Ｃ１中心に揺動回転させながら起立片１５に接近させて行うもので、カール型１６の前面側の、軸孔１７の周辺には、起立片１５に係合する成形面１８が形成されている。この成形面１８は、軸孔１７から半径外方へ向かうに従って後退方向へわずか傾斜するすくい角δ（δ＝θとなるように設計する）を有している。なお、起立片１５の高さＢは、前記フランジ部１１として加工された状態で所定の外径ｄ２（図１（Ａ））を確保できるようにその大きさが設定されている。   Here, as shown in FIG. 2, the flange portion 11 is formed on the boss portion 3 of the lid 2 by curling the standing piece 15 raised in a cylindrical shape from the outer peripheral edge portion of the boss 3 outwardly in the radius. It is formed by processing. In the present embodiment, a swing rotation method is adopted as the curling process. As shown in the figure, the swinging rotation type curl processing is a self-rotating curl that is arranged with an axis O2 inclined by a predetermined angle (swinging angle) θ with respect to the axis O1 of the upright piece 15. The mold 16 is moved close to the upright piece 15 while being swung and rotated about the axis C1 of the upright piece 15. A mating molding surface 18 is formed. The molding surface 18 has a rake angle δ (designed to satisfy δ = θ) that slightly inclines in the receding direction as it goes radially outward from the shaft hole 17. In addition, the height B of the upright piece 15 is set so that a predetermined outer diameter d2 (FIG. 1A) can be secured in a state of being processed as the flange portion 11.

上記した揺動回転方式のカール加工においては、カール型１６をすりこぎ様に揺動回転させながら蓋体２の起立片１５に対して接近させると、該カール型１６の成形面１８が筒状の起立片１５に内側から片当りして転動（自転）し、起立片１５が次第に押し広げられる（カールされる）。そして、遂には、起立片１５が半径外方へほぼ９０度に押し曲げられ、これにより前記フランジ部１１が形成される。また、フランジ部１１が形成されることで、ボス部３の周りには逃げ溝１２が形成される。このように起立片１５のカール加工として揺動回転方式を採用することで、円滑にフランジ部１１を形成することができる。特に、蓋体２がアルミニウム系材料からなる場合は、その延性が鋼材に比べて低いため、単にプレス型でカール加工すると、フランジ部１１にクラックが発生し易くなるが、前記揺動回転方式のカール加工を採用することにより、逐次加工によりカール成形されるため、前記クラック発生を確実に防止することができる。なお、蓋体２がアルミニウム系材料からなる場合、一例として、カール型１６の揺動角度θは２度程度に、その周回速度は毎秒１〜１０回程度にそれぞれ設定される。   In the above-described oscillating rotation type curling, when the curl mold 16 is swung and rotated in a squeezed manner, the curled mold 16 is formed into a cylindrical shape when it is brought close to the upright piece 15 of the lid 2. The upright piece 15 rolls (rotates) while being hit from the inside, and the upright piece 15 is gradually spread (curled). Finally, the upright piece 15 is pushed and bent by about 90 degrees radially outward, thereby forming the flange portion 11. In addition, a relief groove 12 is formed around the boss portion 3 by forming the flange portion 11. Thus, by adopting the swing rotation method as the curling process of the upright piece 15, the flange portion 11 can be formed smoothly. In particular, when the lid body 2 is made of an aluminum-based material, its ductility is lower than that of a steel material. By employing curl processing, curling is performed by sequential processing, so that the occurrence of cracks can be reliably prevented. When the lid 2 is made of an aluminum-based material, for example, the swing angle θ of the curl mold 16 is set to about 2 degrees, and the rotating speed is set to about 1 to 10 times per second.

上記した管体１と蓋体２とを摩擦圧接するに際しては、図１（Ｂ）に示されるように、管体１にボス部３を嵌入させながら蓋体２が管体１に同心に突合わされる。そして、この状態で蓋体２と管体１とが相対回転され、この相対回転により両者の突合せ面に摩擦熱が発生し、蓋体２側の環状突起１０と管体１の先端部とが加熱される。その後、前記相対回転が停止され、蓋体２と管体１に軸方向の押圧力が加えられ（アプセット）、これによって両者の突合せ部が内・外にばりとして押出される。このとき、内側に押出された内ばり１３は、図１（Ｃ）に示されるように、蓋体２のボス部３の周りに形成された逃げ溝１２に逃げ込む。この場合、前記したように管体１の内面とボス部３の先端のフランジ部１１との間にはわずかのクリアランスＳ（図１（Ｂ））が存在するだけであるので、前記逃げ溝１２に逃込んだ内ばり１３は管体１の内部に侵入することなく逃げ溝１２内に留まり、これにより管体１の内面品質が確保される。なお、外側に押出された外ばり１４は、必要により機械加工により削除される。   When the above-described tube body 1 and the lid body 2 are friction-welded, the lid body 2 protrudes concentrically with the tube body 1 while the boss portion 3 is fitted into the tube body 1 as shown in FIG. Combined. In this state, the lid body 2 and the tube body 1 are rotated relative to each other, and the relative rotation generates frictional heat on the abutting surfaces of the two, and the annular projection 10 on the lid body 2 side and the distal end portion of the tube body 1 are connected. Heated. Thereafter, the relative rotation is stopped, and axial pressing force is applied to the lid body 2 and the tube body 1 (upset), whereby the butted portions of both are pushed out as a flash inward and outward. At this time, the inner beam 13 pushed inwardly escapes into a relief groove 12 formed around the boss portion 3 of the lid 2 as shown in FIG. In this case, as described above, there is only a slight clearance S (FIG. 1B) between the inner surface of the tube body 1 and the flange portion 11 at the tip of the boss portion 3. The inner beam 13 that has escaped into the tube 1 remains in the escape groove 12 without entering the inside of the tube body 1, thereby ensuring the quality of the inner surface of the tube body 1. It should be noted that the outer beam 14 pushed outward is deleted by machining if necessary.

このようにして摩擦圧接は終了するが、管体１に突合わされる蓋体２側の環状突起１０が、管体１とほぼ同じ肉厚（ｔ１＝ｔ２）を有しているので、上記した摩擦発熱に際し、回転蓋体２と管体１との突合せ部におけるヒートバランスは良好となり、そのアプセットで、両者からほぼ同量のばり１３，１４が発生し、この結果、良好な接合品質が得られるようになる。   Although the friction welding is thus completed, the annular protrusion 10 on the lid body 2 faced to the tube body 1 has substantially the same thickness (t1 = t2) as that of the tube body 1. When the frictional heat is generated, the heat balance at the abutting portion between the rotary lid 2 and the tube 1 becomes good, and the upsets generate almost the same amount of flashes 13 and 14 from both, resulting in good bonding quality. Be able to.

ここで、摩擦圧接の方式には、大別してブレーキ方式とイナーシャ方式とがあるが、本発明の実施に際しては、そのどちらの方式を採用してもよい。このうち、ブレーキ方式では、クラッチおよびブレーキを備えた回転機構に前記管体１と蓋体２との何れか一方を、油圧シリンダ等からなる加圧機構に前二者の他方を支持させ、例えば、図３に示されるようなサイクル線図に従って摩擦圧接を行う。同図中、Ｔ１は加熱時間、Ｔ２はアプセット時間、Ｐ１は加熱時の印加圧力、Ｐ２はアプセット時の印加圧力、Ｎは回転数（主軸回転数）、Ｆは回転停止（クラッチ切、ブレーキ入）の時点をそれぞれ表しており、本発明の実施に際しては、事前にテストを行って最適の条件を把握し、それに従って摩擦圧接を行う。   Here, the friction welding method is roughly classified into a brake method and an inertia method, and either method may be adopted in the implementation of the present invention. Among these, in the brake system, one of the tube 1 and the lid 2 is supported by a rotating mechanism equipped with a clutch and a brake, and the other of the former two is supported by a pressurizing mechanism including a hydraulic cylinder. Friction welding is performed according to a cycle diagram as shown in FIG. In the figure, T1 is the heating time, T2 is the upset time, P1 is the applied pressure at the time of heating, P2 is the applied pressure at the time of upsetting, N is the rotation speed (spindle rotation speed), F is the rotation stop (clutch disengagement, brake engagement) ), And in carrying out the present invention, a test is performed in advance to determine the optimum conditions, and friction welding is performed according to the conditions.

因みに、図１に示した管体１として、外径Ｄ１＝５０ｍｍ、内径ｄ１＝４０ｍｍ、肉厚ｔ１＝５ｍｍのアルミニウム合金（Ａ６０６１）製チューブを選択し、これに、前記管体１と断面サイズが同じ環状突起１０を設けた、同じアルミニウム合金製の蓋体２を突合せて摩擦圧接したところ、主軸回転数Ｎ＝１３００ｒｐｍ、加熱時圧力Ｐ１＝１×１０4Ｎ、アプセット時圧力Ｐ２＝６×１０4Ｎ、片側寄り代５ｍｍの各条件設定で、良好な接合品質が得られた。 Incidentally, as the tube 1 shown in FIG. 1, an aluminum alloy (A6061) tube having an outer diameter D1 = 50 mm, an inner diameter d1 = 40 mm, and a wall thickness t1 = 5 mm is selected. When the same aluminum alloy lid body 2 provided with the same annular protrusion 10 is abutted and friction welded, the spindle speed N = 1300 rpm, heating pressure P1 = 1 × 10 4 N, upset pressure P2 = 6 × Good bonding quality was obtained with each condition setting of 10 4 N and a margin on one side of 5 mm.

ところで、本発明の管端封口方法は、単筒式油圧緩衝器用シリンダ（有底シリンダ）の製造に利用することができる。この場合、前記管体１は、シリンダを構成するチューブとして、前記蓋体２は、該シリンダの一端を閉じるエンドキャップとしてそれぞれ供されることになる。一方、この単筒式油圧緩衝器のシリンダは、そのエンドキャップとしての蓋体２の背面に車両取付用のアイを接合して完成する。   By the way, the pipe end sealing method of the present invention can be used for manufacturing a cylinder for a single cylinder type hydraulic shock absorber (bottomed cylinder). In this case, the tube 1 is provided as a tube constituting a cylinder, and the lid 2 is provided as an end cap for closing one end of the cylinder. On the other hand, the cylinder of this single cylinder type hydraulic shock absorber is completed by joining a vehicle mounting eye to the back surface of the lid 2 as an end cap.

図４は、本発明の管端封口方法によって得られたシリンダ本体２０のエンドキャップ（蓋体）２に対するアイ２１の接合に摩擦圧接を採用した場合の製造工程を示したものである。上記実施形態において、蓋体２の背面を円錐形状の凸面２ａとしたのは、アイ２１との摩擦圧接を考慮してのことであり、アイ２１の摩擦圧接に際しては、同図（Ａ）に示されるように、この蓋体２の凸面２ａの頂部に円筒形状のアイ２１の周面を突合わせて摩擦圧接が実施される。なお、この摩擦圧接時点では、上記管端封口に際して接合部に生じた外ばり１４はそのまま残しておく。同図（Ｂ）は、前記摩擦圧接後の接合部の状態を示したもので、接合部の周りには、ばり２２が発生している。シリンダは、その後、シリンダ本体２０の周りの外ばり１４を削除して完成し、これにより品質的に信頼性の高いシリンダが得られるようになる。   FIG. 4 shows a manufacturing process in the case where friction welding is employed for joining the eye 21 to the end cap (lid body) 2 of the cylinder body 20 obtained by the tube end sealing method of the present invention. In the above embodiment, the back surface of the lid body 2 has a conical convex surface 2a in consideration of friction welding with the eye 21. In the friction welding of the eye 21, FIG. As shown, friction welding is performed by abutting the peripheral surface of the cylindrical eye 21 on the top of the convex surface 2a of the lid 2. At the time of this friction welding, the outer flash 14 generated at the joint portion at the time of the tube end sealing is left as it is. FIG. 2B shows the state of the joint after the friction welding, and a flash 22 is generated around the joint. The cylinder is then completed by removing the outer burr 14 around the cylinder body 20, thereby obtaining a cylinder with high quality reliability.

なお、上記シリンダの製造においては、図５に示されるように、上記蓋体２に相当する蓋部分２５ａと上記アイ２１に相当するアイ部分２５ｂとを一体に有するキャップ部材２５を用意し、このキャップ部材２５を上記したチューブとしての管体１に摩擦圧接するようにしてもよい。このような形状のキャップ部材２５は、例えば、アルミニウム系材料の熱間押出し加工により大量生産が可能であり、上記したシリンダ本体２０と蓋体２との摩擦圧接（図４）を省略できることと相俟って、単筒式油圧緩衝器用シリンダの製造コストは大幅に低減する。   In the manufacture of the cylinder, as shown in FIG. 5, a cap member 25 having a lid portion 25a corresponding to the lid 2 and an eye portion 25b corresponding to the eye 21 is prepared. The cap member 25 may be friction-welded to the tubular body 1 as the above-described tube. The cap member 25 having such a shape can be mass-produced by, for example, hot extrusion of an aluminum-based material, and the friction welding (FIG. 4) between the cylinder body 20 and the lid body 2 can be omitted. As a result, the manufacturing cost of the single cylinder hydraulic shock absorber cylinder is greatly reduced.

本発明に係る管端封口方法の１つの実施形態を順を追って示す断面図である。It is sectional drawing which shows one embodiment of the tube end sealing method which concerns on this invention later on. 蓋体に逃げ溝を形成するために採用した揺動回転方式のカール加工の実施形態を示す断面図である。It is sectional drawing which shows embodiment of the curling process of the rocking | fluctuation rotation system employ | adopted in order to form a relief groove in a cover body. 本管端封口方法で行う摩擦圧接時の圧力および回転数の経時変化を示すサイクル線図である。It is a cycle diagram which shows the time-dependent change of the pressure at the time of the friction welding performed by a main pipe end sealing method, and rotation speed. 本管端封口方法によって得られたシリンダ本体を単筒式油圧緩衝器用シリンダの製造に適用した場合の製造工程を示す断面図である。It is sectional drawing which shows a manufacturing process at the time of applying the cylinder main body obtained by the main pipe end sealing method to manufacture of the cylinder for single cylinder type hydraulic shock absorbers. 単筒式油圧緩衝器用シリンダの製造に用いるキャップ部材の他の形態を示す断面図である。It is sectional drawing which shows the other form of the cap member used for manufacture of the cylinder for single cylinder type hydraulic shock absorbers. 従来の管端封口方法の１つの実施形態の初期段階を示す断面図である。It is sectional drawing which shows the initial stage of one embodiment of the conventional pipe end sealing method. 従来の管端封口方法の１つの実施形態の最終段階を示す断面図である。It is sectional drawing which shows the last step of one embodiment of the conventional pipe end sealing method.

符号の説明Explanation of symbols

１ 管体
２ 蓋体
３ ボス部
１０ 環状突起
１１ フランジ部
１２ 逃げ溝
１３ 内ばり
１５ 起立片
１６ カール型
２０ シリンダ本体
２１ アイ

DESCRIPTION OF SYMBOLS 1 Tube 2 Lid 3 Boss part 10 Annular protrusion 11 Flange part 12 Escape groove 13 Inner beam 15 Standing piece 16 Curl type 20 Cylinder body 21 Eye

Claims (6)

管体の一端に蓋体を摩擦圧接して管端を封口する方法であって、前記摩擦圧接に際して生じる内側のばりを、前記蓋体の、前記管体に嵌入されるボス部の周りの逃げ溝に逃がす管端封口方法において、前記管体に対する前記蓋体の突合せ部に、前記管体と断面サイズが類似の環状突起を予め形成し、該環状突起と前記管体とを突合せて摩擦圧接することを特徴とする管端封口方法。   A method of sealing a tube end by friction-welding a lid to one end of a tube, wherein an inner flash generated during the friction-welding is caused to escape around a boss portion of the lid fitted into the tube. In the tube end sealing method for escaping into a groove, an annular protrusion having a cross-sectional size similar to that of the tube body is formed in advance at the abutting portion of the lid body with respect to the tube body, and the annular protrusion and the tube body are abutted against each other for friction welding. A tube end sealing method characterized by: 蓋体に形成する環状突起の高さを、少なくとも摩擦圧接時の片側寄り代と同じ大きさに設定することを特徴とする請求項１に記載の管端封口方法。   2. The tube end sealing method according to claim 1, wherein the height of the annular projection formed on the lid is set to at least the same size as the margin on one side during friction welding. 蓋体のボス部の周りの逃げ溝が、該ボスの外周縁部から筒状に起立させた起立片を半径外方へカール加工することにより形成されることを特徴とする請求項１または２に記載の管端封口方法。   3. A relief groove around the boss portion of the lid body is formed by curling up an upright piece that is erected in a cylindrical shape from the outer peripheral edge portion of the boss outwardly in a radius. The tube end sealing method according to 1. カール加工として、起立片の軸に対して傾斜して配置された自転可能なカール型を、前記軸中心に揺動回転させながら起立片に接近させる揺動回転方式を採用することを特徴とする請求項３に記載の管端封口方法。   As the curling process, an oscillating rotation method is adopted, in which a self-rotating curl mold that is inclined with respect to the axis of the upright piece is moved to the upright piece while being rotated about the axis. The tube end sealing method according to claim 3. 管体および蓋体が、アルミニウム系材料からなることを特徴とする請求項１乃至４の何れか１項に記載の管端封口方法。   The tube end sealing method according to any one of claims 1 to 4, wherein the tube body and the lid body are made of an aluminum-based material. 管体が、単筒式油圧緩衝器のシリンダを構成するチューブとして、蓋体が、前記シリンダの一端を閉じるエンドキャップとしてそれぞれ供されることを特徴とする請求項１乃至５の何れか１項に記載の管端封口方法。

The tube body is provided as a tube that constitutes a cylinder of a single cylinder type hydraulic shock absorber, and the lid body is provided as an end cap that closes one end of the cylinder, respectively. The tube end sealing method according to 1.

JP2006050510A 2006-02-27 2006-02-27 Tube end sealing method Pending JP2007229719A (en)

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