JP3945173B2

JP3945173B2 - Cylindrical member all-around welding equipment

Info

Publication number: JP3945173B2
Application number: JP2001070420A
Authority: JP
Inventors: 雅彦安部; 昭夫盛; 昌広平田; 秀彰白井
Original assignee: Denso Corp
Current assignee: Denso Corp
Priority date: 2001-03-13
Filing date: 2001-03-13
Publication date: 2007-07-18
Anticipated expiration: 2021-03-13
Also published as: JP2002263889A

Description

【０００１】
【発明の属する技術分野】
本発明は、略等内径をもつ複数の筒状部材を全周溶接する筒状部材全周溶接装置及び筒状部材全周溶接方法に関する。
【０００２】
【従来の技術及び発明が解決しようとする課題】
種々の用途において内径が等しい複数のパイプを軸芯同一に全周突き合わせ溶接する必要があり、このため従来より、同一軸芯を有して互いに対向するセンタと回転チャックで両パイプを軸方向に挟圧しつつ、回転チャックを回転させて溶接を行っていた。
【０００３】
ただ、この方法では、両パイプの突き合わせ端部で両パイプの軸芯がずれ易く、その結果、突き合わせ溶接面が凸凹状態となる不具合があった。
【０００４】
このため、図４に示すように一方のパイプ１００を径内方向へ厚肉化し、このパイプ１００の先端部に他方のパイプの先端部が嵌着される段差を設け、両パイプの軸芯ずれなしに全周溶接を行い、その後、パイプ１００の厚肉部分を切削除去する方式が考えられた。
【０００５】
しかしながらこの方法でも、上記段差嵌合部のクリアランス分の軸芯ずれは避けがたく、その上、パイプが長い場合には、上記挟圧により両パイプの突き合わせ部が径方向へ倒れてずれが生じる場合があった。更に、切削工程が必要なため、材料費、加工費が増大するという欠点もあった。
【０００６】
本発明は上記問題点に鑑みなされたものであり、略等内径の複数の筒状体を高精度、低コストで軸芯同一に全周溶接可能な筒状部材全周溶接装置及び筒状部材全周溶接方法を提供することをその目的としている。
【００１３】
請求項１記載の発明の筒状体全周溶接装置は、
第一筒状体を貫通して前記第一筒状体と略等内径の第二筒状体の先端部に挿入されるとともに拡径方向に弾性変形可能な筒状部を有し、前記筒状部は、先広の内周面部と、軸方向に平坦な外周面部とを有するマンドレルブッシュ、
先細円錐面を有する先端部と前記第二筒状体の内径と略等径の外径、並びに、前記マンドレルブッシュの軸芯と一致する軸芯を有して前記第二筒状体に挿入される軸方向進退可能なマンドレルアーバーを含み、前記マンドレルアーバーの前記先端部は軸方向に進退して前記マンドレルブッシュの前記筒状部の径を拡縮する第二筒状体支持部材、
前記両筒状体の先端面を突き合わせる突き合わせ機構、及び、
前記両筒状体の先端面が突き合わせされ、前記マンドレルブッシュの前記筒状部が前記第一筒状体を貫通して前記第二筒状体に挿入され、前記マンドレルアーバーの前記円錐部が前記マンドレルブッシュの前記筒状部内に進出して前記筒状部を拡径することにより前記筒状部の外周面を前記両筒状体の内周面に密着させた後、前記両筒状体の突き合わせ端部を全周溶接する全周溶接機構を備えることを特徴としている。
【００１４】
すなわち、本発明によれば、拡径可能なマンドレルブッシュを第一筒状体を貫通して第二筒状体の少なくとも先端部に到達させた状態で、マンドレルアーバーの軸芯とマンドレルブッシュの軸芯とを一致するマンドレルアーバーを第二筒状体を貫通してマンドレルブッシュ内に押し込んでマンドレルブッシュを拡径することによりマンドレルブッシュの平坦な外周面部で両筒状体の内周面を軸方向に一致させ、これにより第二筒状体の軸芯を全長にわたって第一筒状体のそれに一致させるので、両筒状体の軸芯ずれを簡単かつ高精度に防止して、凹凸のない全周溶接を可能とすることができる。
【００１５】
第二筒状体支持部材は、上記マンドレルアーバーを回転可能に基台に支持してもよく、あるいはマンドレルアーバーの基端を軸芯同一かつ相対回転自在に支持するセンタ（基台に回転自在に支持される円錐体）を設けてもよい。
【００１６】
全周溶接のためには、全周溶接機構は溶接エネルギースポットを突き合わせ端部に対して周方向に相対回転する必要があるが、この回転は、マンドレルアーバー及びマンドレルブッシュを回転させることにより実現してもよく、溶接エネルギースポットを回転させてもよい。第二筒状体支持部材としては通常のセンタとしてもよく、なんらかのチャック機構を採用してもよい。マンドレルブッシュは、略円筒状の筒状部を周方向複数等分して構成することができる。この場合、非挿入時にこの筒状部の外周面は先細に形成することが挿入容易化のために好適である。
【００１７】
第二発明の好適な態様において、前記マンドレルブッシュは、前記筒状部の基端部から径外側に延在して前記突き合わせ機構の一部をなす円盤状のフランジ部を有して前記第一筒状体の基端に当接し、
前記突き合わせ機構は、前記第二筒状体支持部材は、前記マンドレルアーバーの基端部から前記マンドレルブッシュの前記フランジ部に軸方向変位可能に嵌着されて前記第二筒状体を前記第一筒状体に向けて軸方向に付勢する付勢部材を含むことを特徴としている。
【００１８】
このようにすれば、マンドレルブッシュのフランジ部と付勢部材という簡素な構成で突き合わせ機構を実現することができる。付勢部材としては、第二筒状体の基端から突出する第二筒状体支持部材のマンドレルアーバーの基端部に螺着されたナットにより簡素に構成することができる。又は、マンドレルアーバーの基端部に軸方向変位可能な付勢リングを嵌着し、この付勢リングを弾性体で付勢してもよい。
【００２２】
【発明の実施の形態】
本発明の筒状部材全周溶接装置の好適な実施例を以下に説明する。
【００２３】
【実施例１】
実施例１の筒状部材全周溶接装置及びそれを用いた筒状部材全周溶接方法を、図１を参照して以下に説明する。
（構造）
１は第一筒状体、２は第二筒状体、３はマンドレルブッシュ、４はマンドレルアーバー、５はセンタ（第二筒状体支持部材）、６はスプリング、７は全周溶接機構である。
【００２４】
第一筒状体１と第二筒状体２は、内径、外径が等しい金属円筒であり、図１では、第一筒状体１の両先端が突き合わせられている。
【００２５】
マンドレルブッシュ３は、第一筒状体１を貫通して第二筒状体２の先端部に挿入されている。マンドレルブッシュ３は、全体として略フランジ形状に形成されており、筒状部３１と、筒状部３１の基端から径方向外側に延在する円盤状のフランジ部３２とからなる。
【００２６】
筒状部３１は、この実施例では、両筒状体１，２より多少径小な円筒を周方向等間隔に分割した割り円筒形状をもち、フランジ部３２に支承された基端を起点として拡径方向に弾性変形可能となっている。ただし、マンドレルブッシュ３の筒状部３１の内周面は先端に向けて連続的に径小に形成されている。
【００２７】
マンドレルアーバー４は、マンドレルブッシュ３の筒状部３１の軸芯と一致する軸芯を有してマンドレルブッシュ３のフランジ部３２の外側からセンタ５に向けて筒状部３１内に挿入された円錐部４１と、この円錐部４１の基端から径方向外側に延在する円盤状のフランジ部４２とからなる。マンドレルアーバー４は、図示しない駆動機構により軸方向進退可能かつ回転可能に形成され、マンドレルブッシュ３のフランジ部３２は、マンドレルアーバー４のフランジ部４２の外周面に軸方向摺動自在に嵌着されている。
【００２８】
センタ（第二筒状体支持部材）５は、マンドレルブッシュ３の軸芯と一致する軸芯をもつ回転自在な円錐体であり、センタ５は、その軸芯が第二筒状体２の軸芯と一致するように第二筒状体２の基端部に挿入されている。
【００２９】
スプリング６は、両フランジ部３２、４２の間に介設されて、フランジ部３２を介して第一筒状体１を第二筒状体２に向けて軸方向に弾性付勢している。
【００３０】
全周溶接機構６は、両筒状体１，２の突き合わせ外周端の一点に合焦されたレーザ溶接機と、上記したマンドレルアーバー４を回転させる不図示の駆動機構とからなる。レーザ溶接機の代わりに種々の抵抗溶接機や放電溶接機を採用してもよく、マンドレルアーバー４を回転させず、溶接機又はそのスポットを回転させてもよい。
（動作）
上記筒状部材全周溶接装置の動作を以下に説明する。
【００３１】
まず最初に、マンドレルアーバー４は後退位置にセットする。次に、第一筒状体１をマンドレルブッシュ３の筒状部３１に嵌める。
【００３２】
次に、センタ５を軸方向マンドレルブッシュ３側に付勢する不図示のスプリングを圧縮して第二筒状体２をセンタ５に芯合わせし、第二筒状体２の先端を第一筒状体１の先端に対面させ、センタ５を元の位置に前進復帰させると、マンドレルブッシュ３の筒状部３１が第二筒状体２の先端部に挿入され、両筒状体１，２はスプリング６などにより突き合わせ方向に弾性付勢される。
【００３３】
これにより、第二筒状体２の軸芯とセンタ５の軸芯とが一致する。また、マンドレルブッシュ３の筒状部３１が第一筒状体１の内径に略等しい外径をもつので、第一筒状体１の軸芯及び第二筒状体２の先端部の軸芯とマンドレルブッシュ３の筒状部３１の軸芯は略一致する。
【００３４】
次に、スプリング６を圧縮しつつマンドレルアーバー４を前進させてマンドレルブッシュ３の筒状部３１を拡径する。その結果、筒状部３１の軸方向平坦な外周面部は筒状体１及び筒状体２の先端部を同軸配置する。
【００３５】
次に、マンドレルアーバー４を回転させつつ、両筒状体１，２の突き合わせ端部を全周にわたって溶接する。次に、マンドレルアーバー４を後退位置に戻し、マンドレルブッシュ３又はセンタ５を筒状体１，２から離れる方向に後退させて、溶接されたワークを取り外す。
【００３６】
これにより、突き合わせ端部を凹凸なしに全周溶接することができる。
【００３７】
【実施例２】
本発明の他の実施例を図２を参照して以下に説明する。
（構造）
１は第一筒状体、２は第二筒状体、３はマンドレルブッシュ、４はマンドレルアーバー（第二筒状体支持部材の一部）、５はセンタ（第二筒状体支持部材の残部）、７は全周溶接機構、８はナット（突き合わせ機構）である。
【００３８】
第一筒状体１と第二筒状体２は、内径、外径が等しい金属円筒であり、図２では、第一筒状体１の両先端が突き合わせられている。
【００３９】
マンドレルブッシュ３は、第一筒状体１を貫通して第二筒状体２の先端部に挿入されている。マンドレルブッシュ３は、全体として略フランジ形状に形成されており、筒状部３１と、筒状部３１の基端から径方向外側に延在する円盤状のフランジ部３２とからなる。
【００４０】
筒状部３１は、この実施例では、両筒状体１，２より多少径小な円筒を周方向等間隔に分割した割り円筒形状をもち、フランジ部３２に支承された基端を起点として拡径方向に弾性変形可能となっている。ただし、マンドレルブッシュ３の筒状部３１の内周面は先端に向けて連続的に径大に形成されている。
【００４１】
マンドレルアーバー４は、円錐状に形成された先端部と、円柱状に形成された基部とを有し、センタ５の先端が嵌合する円錐状凹部が基端に形成され、マンドレルアーバー４の基端はセンタ５の軸芯に一致している。マンドレルアーバー４の円柱部分の外径は第二筒状体２の内径に略一致しているので、第二筒状体２の基端部の軸芯はセンタ５の軸心と一致している。
【００４２】
センタ５は、マンドレルブッシュ３の軸芯と一致する軸芯をもつ回転自在な円錐体であり、マンドレルブッシュ３の筒状体３１の基端部の外径は第一筒状体１の内径に略一致しているので、第一筒状体１の基端部の軸芯はセンタ５の軸心と一致している。
【００４３】
全周溶接機構７は実施例１と同じであり、ナット（突き合わせ機構）８は第二筒状体２からセンタ５側に突出したマンドレルアーバー４の円柱部の雄ねじ面に螺着されている。
【００４４】
（動作）
上記筒状部材全周溶接装置の動作を以下に説明する。
【００４５】
まず最初に、第一筒状体１をマンドレルブッシュ３の筒状部３１に嵌め、外部にてマンドレルアーバー４に第二筒状体２を嵌着する。ナット８はマンドレルアーバー４に螺着されている。
【００４６】
次に、センタ５をマンドレルブッシュ３側に弾性付勢している図示しない弾性体を圧縮してマンドレルアーバー４及び第二筒状体２を図に示す位置にセットし、センタ５を解放すると、センタ５は上記弾性体の付勢によりマンドレルアーバー４をマンドレルブッシュ３側に弾性付勢し、マンドレルアーバー４の円錐状の先端部はマンドレルブッシュ３の筒状部３１を拡径する。
【００４７】
これにより、実施例１と同様に、第二筒状体２の軸芯とセンタ５の軸芯とが一致する。また、マンドレルブッシュ３の拡径した筒状部３１が第一筒状体１及び第二筒状体２の先端部の軸芯をマンドレルブッシュ３の軸芯に一致させる。
【００４８】
次に、ナット８を締めて、両筒状体１，２の突き合わせ端部を突き合わせてから、マンドレルブッシュ３を回転させつつ、両筒状体１，２の突き合わせ端部をレーザー溶接機で全周にわたって溶接する。次に、センタ５を後退位置に戻し、マンドレルアーバー４をナット８にて両筒状体１，２すなわちワークをへの締め付け方向へ回転させることにより取り外す。これにより、突き合わせ端部を凹凸なしに全周溶接することができる。
【００４９】
（変形態様）
実施例２の変形態様を図３を参照して説明する。
【００５０】
この変形態様は３個の筒状体１、２、９を同時に突き合わせ全周溶接するものであって、２つのレーザー溶接機を用いる。
【００５１】
この変形態様の構成、動作は、マンドレルブッシュ３の筒状部３１が第一筒状体１と第三筒状体９を貫通して第二筒状体２の先端部に挿入されていること以外は、実施例２と本質的に同様であり、同様の効果を奏することができる。
【図面の簡単な説明】
【図１】実施例１の筒状部材全周溶接装置の模式断面図である。
【図２】実施例２の筒状部材全周溶接装置の模式断面図である。
【図３】実施例２の変形態様の筒状部材全周溶接装置の模式断面図である。
【図４】従来の筒状部材全周溶接装置の模式断面図である。
【符号の説明】
１は第一筒状体、２は第二筒状体、３はマンドレルブッシュ、４はマンドレルアーバー、５はセンタ（第二筒状体支持部材）、６はスプリング、７は全周溶接機構。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tubular member circumferential welding apparatus and a tubular member circumferential welding method for welding a plurality of tubular members having substantially equal inner diameters.
[0002]
[Prior art and problems to be solved by the invention]
In various applications, it is necessary to butt-weld multiple pipes with the same inner diameter along the entire circumference of the pipe. For this reason, both pipes are axially connected by a center and a rotating chuck that have the same axis and face each other. Welding was performed by rotating the rotary chuck while pinching.
[0003]
However, this method has a problem in that the axial centers of both pipes are easily displaced at the butt end portions of both pipes, and as a result, the butt welding surface becomes uneven.
[0004]
For this reason, as shown in FIG. 4, one pipe 100 is thickened radially inward, and a step where the tip of the other pipe is fitted is provided at the tip of the pipe 100 so that the axial misalignment of both pipes is provided. A method of performing all-around welding without cutting and then cutting and removing a thick portion of the pipe 100 was considered.
[0005]
However, even with this method, it is difficult to avoid misalignment of the center axis corresponding to the clearance of the step fitting portion. In addition, when the pipe is long, the butted portions of both pipes fall down in the radial direction due to the pinching pressure, resulting in misalignment. There was a case. Further, since a cutting process is required, there is a disadvantage that material costs and processing costs increase.
[0006]
The present invention has been made in view of the above-described problems, and a cylindrical member full-circumferential welding apparatus and a cylindrical member capable of welding a plurality of cylindrical bodies having substantially the same inner diameter at the same axis center with high accuracy and low cost. Its purpose is to provide an all-around welding method.
[0013]
The cylindrical body all-around welding device of the invention according to claim 1 is:
A cylindrical portion that penetrates through the first cylindrical body and is inserted into a distal end portion of the second cylindrical body having an approximately equal inner diameter to the first cylindrical body and elastically deformable in an expanding direction; The mandrel bush having a tapered inner peripheral surface portion and an axially flat outer peripheral surface portion,
A tip having a tapered conical surface, an outer diameter substantially equal to the inner diameter of the second cylindrical body, and an axial core that coincides with the axial core of the mandrel bush are inserted into the second cylindrical body. A second cylindrical body support member that includes a mandrel arbor capable of advancing and retreating in the axial direction, wherein the tip portion of the mandrel arbor advances and retreats in the axial direction to expand and contract the diameter of the cylindrical portion of the mandrel bush,
A butting mechanism for butting the front end surfaces of both cylindrical bodies; and
The front end surfaces of the two cylindrical bodies are butted, the cylindrical portion of the mandrel bush passes through the first cylindrical body and is inserted into the second cylindrical body, and the conical portion of the mandrel arbor is After advancing into the cylindrical part of the mandrel bush and expanding the cylindrical part, the outer peripheral surface of the cylindrical part is brought into close contact with the inner peripheral surface of the two cylindrical bodies, It is characterized by including an all-around welding mechanism for welding all ends of the butted ends.
[0014]
That is, according to the present invention, the mandrel bush that can be expanded in diameter is passed through the first tubular body and reaches at least the tip of the second tubular body, and the mandrel arbor shaft core and the mandrel bush shaft The mandrel arbor that matches the core passes through the second cylindrical body and is pushed into the mandrel bush to expand the diameter of the mandrel bush so that the inner peripheral surfaces of both cylindrical bodies are axially aligned with the flat outer peripheral surface of the mandrel bush. Accordingly, the axial center of the second cylindrical body is matched with that of the first cylindrical body over the entire length, so that the axial misalignment of both cylindrical bodies can be prevented easily and with high accuracy, and the entire surface without unevenness can be prevented. Circumferential welding can be enabled.
[0015]
The second cylindrical body support member may support the mandrel arbor on the base so as to be rotatable, or a center for supporting the base end of the mandrel arbor on the same axis and relatively rotatable (the base is rotatable on the base). A supported cone) may be provided.
[0016]
For all-around welding, the all-around welding mechanism needs to rotate the welding energy spot relative to the butt end in the circumferential direction. This rotation is realized by rotating the mandrel arbor and mandrel bush. Alternatively, the welding energy spot may be rotated. The second cylindrical body support member may be a normal center or some kind of chuck mechanism. The mandrel bush can be formed by dividing a substantially cylindrical tubular portion into a plurality of portions in the circumferential direction. In this case, it is suitable for facilitating insertion that the outer peripheral surface of the cylindrical portion is tapered when not inserted.
[0017]
In a preferred aspect of the second invention, the mandrel bush has a disk-like flange portion that extends radially outward from a base end portion of the cylindrical portion and forms a part of the butting mechanism. In contact with the base end of the tubular body,
In the abutting mechanism, the second cylindrical body support member is fitted to the flange portion of the mandrel bush from the base end portion of the mandrel arbor so as to be axially displaceable, and the second cylindrical body is moved to the first portion. It includes a biasing member that biases in the axial direction toward the cylindrical body.
[0018]
In this way, the butting mechanism can be realized with a simple configuration of the flange portion of the mandrel bush and the biasing member. The urging member can be simply configured by a nut screwed to the base end portion of the mandrel arbor of the second cylindrical body support member protruding from the base end of the second cylindrical body. Alternatively, an urging ring that can be displaced in the axial direction may be fitted to the base end portion of the mandrel arbor, and the urging ring may be urged by an elastic body.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
A preferred embodiment of the cylindrical member all-around welding apparatus of the present invention will be described below.
[0023]
[Example 1]
A cylindrical member full circumference welding apparatus and a cylindrical member full circumference welding method using the same according to the first embodiment will be described below with reference to FIG.
(Construction)
1 is a first cylindrical body, 2 is a second cylindrical body, 3 is a mandrel bush, 4 is a mandrel arbor, 5 is a center (second cylindrical body support member), 6 is a spring, and 7 is an all-around welding mechanism. is there.
[0024]
The first cylindrical body 1 and the second cylindrical body 2 are metal cylinders having the same inner diameter and outer diameter, and both ends of the first cylindrical body 1 are butted together in FIG.
[0025]
The mandrel bush 3 passes through the first cylindrical body 1 and is inserted into the distal end portion of the second cylindrical body 2. The mandrel bush 3 is formed in a substantially flange shape as a whole, and includes a cylindrical portion 31 and a disk-shaped flange portion 32 extending radially outward from the proximal end of the cylindrical portion 31.
[0026]
In this embodiment, the cylindrical portion 31 has a split cylindrical shape obtained by dividing a cylinder slightly smaller in diameter than the cylindrical bodies 1 and 2 at equal intervals in the circumferential direction, and starts from the base end supported by the flange portion 32. It is elastically deformable in the diameter expansion direction. However, the inner peripheral surface of the cylindrical portion 31 of the mandrel bush 3 is continuously formed with a small diameter toward the tip.
[0027]
The mandrel arbor 4 has an axial center coinciding with the axial center of the cylindrical part 31 of the mandrel bush 3 and is inserted into the cylindrical part 31 from the outside of the flange part 32 of the mandrel bush 3 toward the center 5. A portion 41 and a disc-shaped flange portion 42 extending radially outward from the base end of the conical portion 41. The mandrel arbor 4 is formed so as to be able to advance and retreat in the axial direction and to be rotatable by a drive mechanism (not shown). ing.
[0028]
The center (second cylindrical body support member) 5 is a rotatable cone having an axis that coincides with the axis of the mandrel bush 3. The center 5 has an axis that is the axis of the second cylindrical body 2. It is inserted in the base end part of the 2nd cylindrical body 2 so that it may correspond with a core.
[0029]
The spring 6 is interposed between the flange portions 32 and 42, and elastically biases the first tubular body 1 toward the second tubular body 2 in the axial direction via the flange portion 32.
[0030]
The all-around welding mechanism 6 includes a laser welding machine focused on one point of the butted outer peripheral ends of both cylindrical bodies 1 and 2 and a drive mechanism (not shown) that rotates the mandrel arbor 4 described above. Various resistance welders and electric discharge welders may be employed instead of the laser welder, and the welder or its spot may be rotated without rotating the mandrel arbor 4.
(Operation)
The operation of the cylindrical member full circumference welding apparatus will be described below.
[0031]
First, the mandrel arbor 4 is set in the retracted position. Next, the first tubular body 1 is fitted into the tubular portion 31 of the mandrel bush 3.
[0032]
Next, a spring (not shown) that urges the center 5 toward the axial mandrel bush 3 is compressed to align the second cylindrical body 2 with the center 5, and the tip of the second cylindrical body 2 is aligned with the first cylinder. When facing the front end of the cylindrical body 1 and the center 5 is advanced and returned to the original position, the cylindrical portion 31 of the mandrel bush 3 is inserted into the distal end portion of the second cylindrical body 2 and both cylindrical bodies 1 and 2 are inserted. Is elastically biased in the abutting direction by a spring 6 or the like.
[0033]
Thereby, the axial center of the 2nd cylindrical body 2 and the axial center of the center 5 correspond. Further, since the cylindrical portion 31 of the mandrel bush 3 has an outer diameter substantially equal to the inner diameter of the first cylindrical body 1, the axial core of the first cylindrical body 1 and the axial core of the distal end portion of the second cylindrical body 2. And the axial center of the cylindrical portion 31 of the mandrel bush 3 substantially coincide.
[0034]
Next, the mandrel arbor 4 is advanced while compressing the spring 6 to expand the diameter of the cylindrical portion 31 of the mandrel bush 3. As a result, the axially flat outer peripheral surface portion of the cylindrical portion 31 coaxially arranges the tip portions of the cylindrical body 1 and the cylindrical body 2.
[0035]
Next, the butted ends of both cylindrical bodies 1 and 2 are welded over the entire circumference while rotating the mandrel arbor 4. Next, the mandrel arbor 4 is returned to the retracted position, the mandrel bush 3 or the center 5 is retracted in a direction away from the cylindrical bodies 1 and 2, and the welded workpiece is removed.
[0036]
Thereby, a butt | matching edge part can be welded all over without an unevenness | corrugation.
[0037]
[Example 2]
Another embodiment of the present invention will be described below with reference to FIG.
(Construction)
1 is a first cylindrical body, 2 is a second cylindrical body, 3 is a mandrel bush, 4 is a mandrel arbor (a part of a second cylindrical body support member), and 5 is a center (a second cylindrical body support member). (Remaining part), 7 is an all-around welding mechanism, and 8 is a nut (butting mechanism).
[0038]
The first cylindrical body 1 and the second cylindrical body 2 are metal cylinders having the same inner diameter and outer diameter, and both ends of the first cylindrical body 1 are butted together in FIG.
[0039]
The mandrel bush 3 passes through the first cylindrical body 1 and is inserted into the distal end portion of the second cylindrical body 2. The mandrel bush 3 is formed in a substantially flange shape as a whole, and includes a cylindrical portion 31 and a disk-shaped flange portion 32 extending radially outward from the proximal end of the cylindrical portion 31.
[0040]
In this embodiment, the cylindrical portion 31 has a split cylindrical shape obtained by dividing a cylinder slightly smaller in diameter than the cylindrical bodies 1 and 2 at equal intervals in the circumferential direction, and starts from the base end supported by the flange portion 32. It is elastically deformable in the diameter expansion direction. However, the inner peripheral surface of the cylindrical portion 31 of the mandrel bush 3 is continuously formed in a large diameter toward the tip.
[0041]
The mandrel arbor 4 has a tip portion formed in a conical shape and a base portion formed in a columnar shape, and a conical recess into which the tip of the center 5 is fitted is formed at the base end. The end coincides with the axis of the center 5. Since the outer diameter of the cylindrical portion of the mandrel arbor 4 substantially matches the inner diameter of the second cylindrical body 2, the axial center of the base end portion of the second cylindrical body 2 matches the axis of the center 5. .
[0042]
The center 5 is a rotatable cone having an axis that coincides with the axis of the mandrel bush 3, and the outer diameter of the base end portion of the cylindrical body 31 of the mandrel bush 3 is equal to the inner diameter of the first cylindrical body 1. Since they substantially coincide with each other, the axial center of the base end portion of the first cylindrical body 1 coincides with the axis of the center 5.
[0043]
The all-around welding mechanism 7 is the same as that of the first embodiment, and the nut (butting mechanism) 8 is screwed to the male thread surface of the cylindrical portion of the mandrel arbor 4 protruding from the second tubular body 2 toward the center 5 side.
[0044]
(Operation)
The operation of the cylindrical member full circumference welding apparatus will be described below.
[0045]
First, the first tubular body 1 is fitted into the tubular portion 31 of the mandrel bush 3, and the second tubular body 2 is fitted to the mandrel arbor 4 outside. The nut 8 is screwed to the mandrel arbor 4.
[0046]
Next, an unillustrated elastic body that elastically biases the center 5 toward the mandrel bush 3 side is compressed, the mandrel arbor 4 and the second cylindrical body 2 are set at the positions shown in the figure, and the center 5 is released. The center 5 elastically urges the mandrel arbor 4 toward the mandrel bush 3 by the urging of the elastic body, and the conical tip of the mandrel arbor 4 expands the cylindrical portion 31 of the mandrel bush 3.
[0047]
Thereby, similarly to Example 1, the axial center of the 2nd cylindrical body 2 and the axial center of the center 5 correspond. Further, the expanded cylindrical portion 31 of the mandrel bush 3 causes the axial centers of the tip portions of the first cylindrical body 1 and the second cylindrical body 2 to coincide with the axial core of the mandrel bush 3.
[0048]
Next, after tightening the nut 8 and butting the butted ends of both cylindrical bodies 1 and 2, the mandrel bush 3 is rotated, and the butted ends of both tubular bodies 1 and 2 are all removed with a laser welding machine. Weld around the circumference. Next, the center 5 is returned to the retracted position, and the mandrel arbor 4 is removed by rotating both cylindrical bodies 1 and 2, that is, the workpiece in the tightening direction with the nut 8. Thereby, a butt | matching edge part can be welded all over without an unevenness | corrugation.
[0049]
(Modification)
A modification of the second embodiment will be described with reference to FIG.
[0050]
In this modification, three cylindrical bodies 1, 2, and 9 are simultaneously butted and welded all around, and two laser welding machines are used.
[0051]
The configuration and operation of this modified mode is that the cylindrical portion 31 of the mandrel bush 3 passes through the first cylindrical body 1 and the third cylindrical body 9 and is inserted into the distal end portion of the second cylindrical body 2. Except for this, it is essentially the same as in Example 2, and the same effects can be achieved.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view of a cylindrical member full circumference welding apparatus according to a first embodiment.
FIG. 2 is a schematic cross-sectional view of a cylindrical member full circumference welding apparatus according to a second embodiment.
3 is a schematic cross-sectional view of a tubular member full circumference welding apparatus according to a modified embodiment of Example 2. FIG.
FIG. 4 is a schematic cross-sectional view of a conventional cylindrical member all-around welding apparatus.
[Explanation of symbols]
1 is a first cylindrical body, 2 is a second cylindrical body, 3 is a mandrel bush, 4 is a mandrel arbor, 5 is a center (second cylindrical body support member), 6 is a spring, and 7 is an all-around welding mechanism.

Claims

A cylindrical portion that penetrates through the first cylindrical body and is inserted into a distal end portion of the second cylindrical body having an approximately equal inner diameter to the first cylindrical body and elastically deformable in an expanding direction; The mandrel bush having a tapered inner peripheral surface portion and an axially flat outer peripheral surface portion,
A tip having a tapered conical surface, an outer diameter substantially equal to the inner diameter of the second cylindrical body, and an axial core that coincides with the axial core of the mandrel bush are inserted into the second cylindrical body. A second cylindrical body support member that includes a mandrel arbor capable of advancing and retreating in the axial direction, wherein the tip portion of the mandrel arbor advances and retreats in the axial direction to expand and contract the diameter of the cylindrical portion of the mandrel bush,
A butting mechanism for butting the front end surfaces of both cylindrical bodies; and
The front end surfaces of the two cylindrical bodies are butted, the cylindrical portion of the mandrel bush passes through the first cylindrical body and is inserted into the second cylindrical body, and the conical portion of the mandrel arbor is After advancing into the cylindrical part of the mandrel bush and expanding the cylindrical part, the outer peripheral surface of the cylindrical part is brought into close contact with the inner peripheral surface of the two cylindrical bodies, An all-around welding mechanism that welds the butt end around the circumference,
A cylindrical body all-around welding apparatus comprising:

In the cylindrical body all-around welding device according to claim 1,
The mandrel bush has a disk-like flange portion that extends radially outward from the base end portion of the cylindrical portion and forms a part of the abutting mechanism, and abuts on the base end of the first cylindrical body. ,
In the abutting mechanism, the second cylindrical body support member is fitted to the flange portion of the mandrel bush from the base end portion of the mandrel arbor so as to be axially displaceable, and the second cylindrical body is moved to the first portion. A cylindrical body all-around welding apparatus comprising an urging member that urges the cylindrical body in an axial direction.