JP2010155265A - Method of welding tubular body, welded pipe made of metal and core metal fitting - Google Patents

Method of welding tubular body, welded pipe made of metal and core metal fitting Download PDF

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JP2010155265A
JP2010155265A JP2008335146A JP2008335146A JP2010155265A JP 2010155265 A JP2010155265 A JP 2010155265A JP 2008335146 A JP2008335146 A JP 2008335146A JP 2008335146 A JP2008335146 A JP 2008335146A JP 2010155265 A JP2010155265 A JP 2010155265A
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peripheral surface
metal
pipe
welded
tubular body
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JP5301267B2 (en
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Rinichi Kurata
林一 倉田
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Bridgestone Corp
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Bridgestone Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To suppress the generation of burrs on the side of the inner circumferential surface of a weld zone when butting and welding the end faces of two tubular bodies made of metal. <P>SOLUTION: A mandrel 26 is inserted into the first and secind tubular bodies 14 and 16 of the core metal fitting 10. The inside diameter of the inner circumferential surface 14A of the first tubular body 14 is formed larger than the inside diameter of a hose connecting part 12 of the core metal fitting 10 and, by inserting the axial-direction end part of the mandrel 26 into the hose connecting part 12, alignment is performed so that intervals between the outer circumferential surface of the mandrel 26 and the inner circumferential surface 14A of the first tubular body 14 and between the outer circumferential surface of the mandrel 26 and the inner circumferential surface 16A of the second tubular body 16 are nearly constant along the circumferential direction. Furthermore, the end face of the first tubular body 14 and the end face of the second tubular body 16 are welded in a state wherein the end face of the first tubular body 14 and the end face of the second tubular body 16 are butted, and the mandrel 26 is pulled out after welding. Because the mandrel 26 is inserted into the sides of the inner circumferential surfaces of the end faces of the first tubular body 14 and the end face of the second tubular body 16 in welding, the generation of the burrs on the side of the inner circumferential surface of the weld zone is suppressed. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

本発明は、２つの金属製管体を溶接する管体溶接方法、この管体溶接方法を用いて製造された金属製溶接管及び芯金具に関する。   The present invention relates to a tube welding method for welding two metal tube bodies, and a metal weld tube and a core metal fitting manufactured by using this tube welding method.

一般的に、２つの管体の端面を突き合わせて溶接すると、管体同士の内周側および外周側にバリが発生する。特に、管体の内部に液体を通す液圧配管などでは、このバリが流路を塞ぐため、バリを除去する必要がある。バリを除去する方法としては、例えば、ドリル等による切削加工やプレスによる打ち抜きがあるが、工数がかかるという問題がある。   Generally, when the end faces of two tubular bodies are butted and welded, burrs are generated on the inner peripheral side and the outer peripheral side of the tubular bodies. In particular, in a hydraulic pipe or the like that allows liquid to pass through the inside of the tube body, this burr blocks the flow path, and thus it is necessary to remove the burr. Methods for removing burrs include, for example, cutting with a drill or punching with a press, but there is a problem that man-hours are required.

これに対して、特許文献１には、２つの合成樹脂管の端面を突き合わせて溶接する際に、２つの合成樹脂管の内部にゴム製の弾性体を配置し、この弾性体を軸方向両側から押圧する構成が開示されている。２つの合成樹脂管の溶接後は、弾性体の押圧を解除することで、溶接した合成樹脂管の内部から弾性体を引き抜くことができる。
特開平５−２７８１１０号公報 On the other hand, in Patent Document 1, when the end faces of two synthetic resin pipes are butted and welded, rubber elastic bodies are arranged inside the two synthetic resin pipes, and the elastic bodies are disposed on both axial sides. The structure which presses from is disclosed. After the two synthetic resin pipes are welded, the elastic body can be pulled out from the inside of the welded synthetic resin pipe by releasing the pressing of the elastic body.
JP-A-5-278110

上記特許文献１では、ゴム製の弾性体を軸方向両側から押圧することで、合成樹脂管同士の溶接部の内周側にビードが発生しにくくなるが、弾性体の弾性力によっては溶接時に弾性体がへこみ、ビードの発生を抑制する効果が小さい。また、ゴム製の弾性体をそのまま金属製管体同士の溶接に用いることはできない。   In Patent Document 1, by pressing the rubber elastic body from both sides in the axial direction, beads are less likely to be generated on the inner peripheral side of the welded portion between the synthetic resin pipes. However, depending on the elastic force of the elastic body, An elastic body is dented and the effect which suppresses generation | occurrence | production of a bead is small. Further, a rubber elastic body cannot be used for welding metal pipe bodies as they are.

本発明は、上記問題点に鑑みてなされたものであり、２つの金属製管体の端面を突き合わせて溶接するときに内周面側へのバリの発生を抑制することができる管体溶接方法、溶接管及び芯金具を提供することを目的とする。   The present invention has been made in view of the above problems, and a tube welding method capable of suppressing the occurrence of burrs on the inner peripheral surface side when welding the end surfaces of two metal tube bodies. It aims at providing a welded pipe and a core metal fitting.

請求項１に記載の発明に係る管体溶接方法は、断面が円形の規制部材に２つの金属製管体を差し込む装着工程と、前記規制部材の外周面と前記２つの金属製管体の内周面との間隔を周方向に沿って一定とする位置合わせ工程と、前記２つの金属製管体の端面を突き合わせて外部から溶接する溶接工程と、突き合わせ溶接された前記金属製管体から前記規制部材を引き抜く引抜工程と、を有している。   According to the first aspect of the present invention, there is provided a pipe welding method comprising: a mounting step of inserting two metal pipes into a restriction member having a circular cross section; an outer peripheral surface of the restriction member; An alignment step of making the distance from the peripheral surface constant along the circumferential direction, a welding step of abutting the end surfaces of the two metal pipe bodies and welding them from the outside, and the butt-welded metal pipe body from the above A drawing step of drawing out the regulating member.

請求項１に記載の発明によれば、装着工程で断面が円形の規制部材に２つの金属製管体を差し込み、位置合わせ工程で規制部材の外周面と２つの金属製管体の内周面との間隔を周方向に沿って一定とするような位置合わせを行う。さらに、溶接工程で２つの金属製管体の端面を突き合わせて外部から２つの金属製管体の端面を溶接する。そのとき、規制部材の外周面と２つの金属製管体の内周面との間隔が保持された状態で２つの金属製管体の端面が溶接され、溶接時に内周面側へ発生しようとするバリが規制部材に当接し、内周面側へのバリの発生が抑制される。その後、引抜工程で、突き合わせ溶接された金属製管体から規制部材を引き抜く。これによって、突き合わせ溶接された金属製管体の内周面側のバリを小さくすることができる。   According to the first aspect of the present invention, the two metal pipe bodies are inserted into the restriction member having a circular cross section in the mounting step, and the outer peripheral surface of the restriction member and the inner peripheral surface of the two metal pipe bodies in the alignment step. Alignment is performed so that the interval between and is constant along the circumferential direction. Furthermore, the end surfaces of the two metal pipe bodies are abutted in the welding process, and the end faces of the two metal pipe bodies are welded from the outside. At that time, the end surfaces of the two metal tube bodies are welded in a state where the distance between the outer peripheral surface of the regulating member and the inner peripheral surface of the two metal tube bodies is maintained, and an attempt is made to generate the inner surface side during welding. The burr to be brought into contact with the regulating member suppresses the generation of the burr on the inner peripheral surface side. Thereafter, in the drawing process, the regulating member is pulled out from the butt-welded metal tube. Thereby, the burr | flash on the internal peripheral surface side of the metal pipe body butt-welded can be made small.

請求項２に記載の発明に係る管体溶接方法は、請求項１に記載の管体溶接方法において、前記規制部材が、前記金属製管体よりも軟化点の高い材料で構成されている。   A pipe welding method according to a second aspect of the present invention is the pipe welding method according to the first aspect, wherein the restriction member is made of a material having a softening point higher than that of the metal pipe.

請求項２に記載の発明によれば、規制部材が金属製管体よりも軟化点の高い材料で構成されており、２つの金属製管体の溶接時に規制部材が溶融するのを防止することができる。   According to the invention described in claim 2, the regulating member is made of a material having a softening point higher than that of the metal pipe body, and prevents the regulating member from being melted when the two metal pipe bodies are welded. Can do.

請求項３に記載の発明に係る管体溶接方法は、請求項１又は請求項２に記載の管体溶接方法において、前記規制部材の表面に、前記金属製管体よりも摩擦係数の小さい材料からなるコーティング層が形成されている。   A pipe welding method according to a third aspect of the present invention is the pipe welding method according to the first or second aspect, wherein a material having a smaller coefficient of friction than the metal pipe body is provided on the surface of the regulating member. The coating layer which consists of is formed.

請求項３に記載の発明によれば、規制部材の表面に、金属製管体よりも摩擦係数の小さい材料からなるコーティング層が形成されており、２つの金属製管体の溶接後にバリが規制部材に固着することが抑制され、規制部材を容易に金属製管体から引き抜くことができる。   According to invention of Claim 3, the coating layer which consists of a material with a smaller friction coefficient than a metal pipe body is formed in the surface of a control member, and a burr | flash is controlled after welding of two metal pipe bodies. Sticking to the member is suppressed, and the regulating member can be easily pulled out from the metal pipe body.

請求項４に記載の発明に係る管体溶接方法は、請求項１から請求項３までのいずれか１項に記載の管体溶接方法において、前記金属製管体の内周面と前記規制部材の外周面との間隔が、０．３〜２．０ｍｍに設定されている。   The pipe welding method according to the invention described in claim 4 is the pipe welding method according to any one of claims 1 to 3, wherein an inner peripheral surface of the metal pipe and the regulating member are provided. Is set to 0.3 to 2.0 mm.

請求項４に記載の発明によれば、金属製管体の内周面と規制部材の外周面との間隔が、０．３〜２．０ｍｍに設定されており、２つの金属製管体の溶接時に内周面側へのバリの発生をより一層抑制することができる。これに対して、上記間隔が０．３ｍｍより小さいと、バリの逃れる場所がなくなる。また、上記間隔が２．０ｍｍより大きいと、バリの発生を抑制する効果が低下する。   According to invention of Claim 4, the space | interval of the inner peripheral surface of a metal pipe body and the outer peripheral surface of a control member is set to 0.3-2.0 mm, and two metal pipe bodies of Generation of burrs on the inner peripheral surface side during welding can be further suppressed. On the other hand, if the interval is smaller than 0.3 mm, there is no place for burr to escape. Moreover, when the said space | interval is larger than 2.0 mm, the effect which suppresses generation | occurrence | production of a burr | flash will fall.

請求項５に記載の発明に係る管体溶接方法は、請求項１から請求項４までのいずれか１項に記載の管体溶接方法において、前記金属製管体の一方の長手方向における端面側の内径が奥部の内径より大きく形成され、前記規制部材の外周面を前記奥部に挿入することにより、前記端面側の内周面と前記規制部材の外周面との間隔を保持するものとする。   The pipe welding method according to the invention described in claim 5 is the pipe welding method according to any one of claims 1 to 4, wherein an end face side in one longitudinal direction of the metal pipe body is provided. The inner diameter of the inner surface is larger than the inner diameter of the inner portion, and the outer peripheral surface of the restricting member is inserted into the inner portion, thereby maintaining a distance between the inner peripheral surface on the end surface side and the outer peripheral surface of the restricting member. To do.

請求項５に記載の発明によれば、金属製管体の一方の長手方向における端面側の内径が奥部の内径より大きく形成されており、規制部材の外周面を奥部に挿入することで、規制部材の外周面と金属製管体の内周面とが周方向に沿って所定の間隔となるように位置合わせされる。これにより、簡単な構成で金属製管体の端面側の内周面と規制部材の外周面とを所定の間隔に保持することができる。   According to the fifth aspect of the present invention, the inner diameter of the end face side in one longitudinal direction of the metal pipe body is formed larger than the inner diameter of the inner part, and the outer peripheral surface of the regulating member is inserted into the inner part. The outer peripheral surface of the restricting member and the inner peripheral surface of the metal pipe body are aligned so as to have a predetermined interval along the circumferential direction. Thereby, the inner peripheral surface on the end surface side of the metal pipe body and the outer peripheral surface of the restricting member can be held at a predetermined interval with a simple configuration.

請求項６に記載の発明に係る管体溶接方法は、請求項１から請求項４までのいずれか１項に記載の管体溶接方法において、前記規制部材の先端部の外周面に当該先端部側に行くにしたがって小径となるテーパー面を備え、前記金属製管体の内周面と前記テーパー面の外周面との間隔を保持するものとする。   The pipe welding method according to the invention described in claim 6 is the pipe welding method according to any one of claims 1 to 4, wherein the tip portion is formed on the outer peripheral surface of the tip portion of the regulating member. A tapered surface having a smaller diameter as it goes to the side is provided, and the distance between the inner peripheral surface of the metal tube and the outer peripheral surface of the tapered surface is maintained.

請求項６に記載の発明によれば、規制部材の先端部の外周面に当該先端部側に行くにしたがって小径となるテーパー面を備えており、規制部材のテーパー面を２つの金属製管体の端面付近に挿入することで、規制部材のテーパー面と金属製管体の内周面とが周方向に沿って所定の間隔となるように位置合わせされる。これにより、簡単な構成で金属製管体の内周面と規制部材の外周面とを所定の間隔に保持することができる。   According to the sixth aspect of the present invention, the outer peripheral surface of the distal end portion of the regulating member is provided with the tapered surface that becomes smaller in diameter toward the distal end portion side, and the tapered surface of the regulating member is provided with two metal pipe bodies. By inserting in the vicinity of the end face, the taper surface of the restricting member and the inner peripheral surface of the metal tube body are aligned so as to have a predetermined interval along the circumferential direction. Thereby, the internal peripheral surface of a metal pipe body and the outer peripheral surface of a control member can be hold | maintained to predetermined spacing with easy structure.

請求項７に記載の発明に係る金属製溶接管は、請求項１から請求項６までのいずれか１項に記載の管体溶接方法を用いて溶接された金属製溶接管であって、前記２つの金属製管体の端面を突き合わせて溶接された溶接部の内周面側のバリが外周面側のバリよりも小さい構成とされている。   A metal welded pipe according to the invention of claim 7 is a metal welded pipe welded by using the tubular body welding method according to any one of claims 1 to 6, wherein The burrs on the inner peripheral surface side of the welded portion welded by abutting the end surfaces of the two metal pipe bodies are smaller than the burrs on the outer peripheral surface side.

請求項７に記載の発明によれば、請求項１から請求項６までのいずれか１項に記載の管体溶接方法を用い、２つの金属製管体の端面を突き合わせて溶接することで、溶接部の内周面側のバリが外周面側のバリよりも小さい構成とされている。これによって、２つの金属製管体を溶接した金属製溶接管の流路を確保することができる。   According to the invention described in claim 7, by using the pipe body welding method according to any one of claims 1 to 6, the end surfaces of two metal pipe bodies are butted and welded, The burr on the inner peripheral surface side of the welded portion is configured to be smaller than the burr on the outer peripheral surface side. Thereby, the flow path of the metal welding pipe which welded two metal pipe bodies is securable.

請求項８に記載の発明に係る芯金具は、ホースが接続される継手の芯金具であって、軸方向端部に請求項７に記載の金属製溶接管を備えている。   A core metal fitting according to an eighth aspect of the present invention is a core metal fitting for a joint to which a hose is connected, and is provided with the metal welded pipe according to the seventh aspect at an axial end portion.

請求項８に記載の発明によれば、芯金具の軸方向端部に請求項７に記載の金属製溶接管を備えており、金属製溶接管の内周面側へのバリの発生が抑制されることで、金属製溶接管の流路を確保することができる。   According to the eighth aspect of the present invention, the metal welded pipe according to the seventh aspect is provided at the axial end of the core metal fitting, and the occurrence of burrs on the inner peripheral surface side of the metal welded pipe is suppressed. As a result, the flow path of the metal welded pipe can be secured.

以上説明したように、本発明によれば、２つの金属製管体の端面を突き合わせて溶接するときに内周面側へのバリの発生を抑制することができる。   As described above, according to the present invention, the occurrence of burrs on the inner peripheral surface side can be suppressed when the end faces of two metal pipe bodies are butted and welded.

以下、本発明の溶接管における実施の形態を図面に基づいて説明する。   Hereinafter, embodiments of the welded pipe of the present invention will be described with reference to the drawings.

図１及び図２には、本発明の第１実施形態である溶接管１８を備えた芯金具１０が示されている。図３には、溶接管を溶接する前の芯金具１０が示されている。これらの図に示されるように、芯金具１０は、軸方向の一端側に形成されたホース接続部１２と、軸方向の他端側に形成された金属製管体としての第１管体１４と、を備えている。芯金具１０の軸方向の第１管体１４の端部側には、第１管体１４の端面に溶接された金属製管体としての第２管体１６を備えている。すなわち、第１管体１４の軸方向片側（図１中の軸方向左側）の端面と第２管体１６の軸方向片側（図１中の軸方向右側）の端面とが溶接されることにより、２つの金属製管体が溶接された金属製溶接管としての溶接管１８が形成されている。芯金具１０の中間部２０の第１管体１４側には、スパナを把持するための六角形状の把持部２１が形成されている。本実施形態では、第１管体１４を備えた芯金具１０と第２管体１６とは鋼材で形成されている。   1 and 2 show a metal core 10 provided with a welded pipe 18 according to the first embodiment of the present invention. FIG. 3 shows the core metal fitting 10 before the welded pipe is welded. As shown in these drawings, the core metal fitting 10 includes a hose connection portion 12 formed on one end side in the axial direction and a first pipe body 14 as a metal tube formed on the other end side in the axial direction. And. On the end side of the first tubular body 14 in the axial direction of the core metal fitting 10, a second tubular body 16 is provided as a metallic tubular body welded to the end face of the first tubular body 14. That is, the end surface on one axial side (the left side in the axial direction in FIG. 1) of the first tubular body 14 and the end surface on one axial side (the right side in the axial direction in FIG. 1) of the second tubular body 16 are welded. A welded pipe 18 is formed as a metal welded pipe in which two metal pipes are welded. A hexagonal gripping portion 21 for gripping the spanner is formed on the first tubular body 14 side of the intermediate portion 20 of the core metal fitting 10. In this embodiment, the core metal fitting 10 provided with the 1st pipe body 14 and the 2nd pipe body 16 are formed with steel materials.

ホース接続部１２の外周面には、周方向に沿って複数の突起部１３が形成されており、ホース接続部１２の外周面にホース（図示省略）が差し込まれて接続されるようになっている。突起部１３は、ホースの差込方向にテーパー面１３Ａが形成されると共に、ホースの引き抜き方向に半径方向に沿った壁１３Ｂが形成されており、ホースの抜けが抑制される構成である。芯金具１０の中間部２０の内周面２０Ａと第１管体１４の内周面１４Ａとの接続部分には段差２０Ｂが形成されており、第１管体１４の内径が中間部２０及びホース接続部１２の内径よりも大きく形成されている。   A plurality of protrusions 13 are formed on the outer peripheral surface of the hose connection portion 12 along the circumferential direction, and a hose (not shown) is inserted and connected to the outer peripheral surface of the hose connection portion 12. Yes. The protrusion 13 has a tapered surface 13A formed in the hose insertion direction and a wall 13B formed along the radial direction in the hose pull-out direction so that the hose can be prevented from coming off. A step 20B is formed at a connecting portion between the inner peripheral surface 20A of the intermediate portion 20 of the core metal 10 and the inner peripheral surface 14A of the first tubular body 14, and the inner diameter of the first tubular body 14 is the intermediate portion 20 and the hose. It is formed larger than the inner diameter of the connecting portion 12.

第１管体１４の端面と第２管体１６の端面との溶接時には、第１管体１４の端面と第２管体１６の端面にまたがって規制部材としての円柱状のマンドル２６が挿入される。マンドル２６は、第１管体１４の内径及び第２管体１６の内径よりも小さく、かつ、第１管体１４の内周面１４Ａ及び第２管体１６の内周面１６Ａとの間に所定の隙間が形成されるような外径寸法に設定されている。本実施形態では、マンドル２６の外径は、中間部２０及びホース接続部１２の内径よりも若干小さく形成されており、マンドル２６を中間部２０又はホース接続部１２に挿入したときにマンドル２６のガタツキが抑制される構成である。マンドル２６を中間部２０又はホース接続部１２に挿入することで、第１管体１４の内周面１４Ａ及び第２管体１６の内周面１６Ａと、マンドル２６の外周面との間隔が周方向に沿ってほぼ一定となるように位置合わせされる。   When welding the end face of the first tubular body 14 and the end face of the second tubular body 16, a cylindrical mandle 26 as a regulating member is inserted across the end face of the first tubular body 14 and the end face of the second tubular body 16. The The mandrel 26 is smaller than the inner diameter of the first tube body 14 and the inner diameter of the second tube body 16, and between the inner peripheral surface 14 </ b> A of the first tube body 14 and the inner peripheral surface 16 </ b> A of the second tube body 16. The outer diameter is set such that a predetermined gap is formed. In this embodiment, the outer diameter of the mandrel 26 is slightly smaller than the inner diameters of the intermediate part 20 and the hose connection part 12, and when the mandrel 26 is inserted into the intermediate part 20 or the hose connection part 12, In this configuration, rattling is suppressed. By inserting the mandrel 26 into the intermediate part 20 or the hose connection part 12, the distance between the inner peripheral surface 14A of the first tubular body 14 and the inner peripheral surface 16A of the second tubular body 16 and the outer peripheral surface of the mandrel 26 is reduced. It is aligned so as to be substantially constant along the direction.

第１管体１４の内周面１４Ａ及び第２管体１６の内周面１６Ａと、マンドル２６の外周面との間隔は、０．３〜２．０ｍｍに設定されることが好ましい。このような範囲に設定するのは、上記間隔が０．３ｍｍより小さいと、バリの逃れる場所がなくなり、また、上記間隔が２．０ｍｍより大きいと、バリの発生を抑制する効果が低下するためである。   The distance between the inner peripheral surface 14A of the first tubular body 14 and the inner peripheral surface 16A of the second tubular body 16 and the outer peripheral surface of the mandrel 26 is preferably set to 0.3 to 2.0 mm. The reason for setting such a range is that if the distance is smaller than 0.3 mm, there will be no place for burrs to escape, and if the distance is larger than 2.0 mm, the effect of suppressing the occurrence of burrs will be reduced. It is.

マンドル２６は、第１管体１４及び第２管体１６よりも軟化点の高い剛性体（例えば、鋼材）で形成されている。また、マンドル２６の表面には、第１管体１４及び第２管体１６の内周面よりも摩擦係数の小さい材料からなるコーティング層２７が形成されている。コーティング層２７としては、例えば、ポリテトラフルオロエチレン等のフッ素樹脂などが用いられている。   The mandrel 26 is formed of a rigid body (for example, steel material) having a softening point higher than that of the first tube body 14 and the second tube body 16. A coating layer 27 made of a material having a smaller friction coefficient than the inner peripheral surfaces of the first tube body 14 and the second tube body 16 is formed on the surface of the mandrel 26. As the coating layer 27, for example, a fluororesin such as polytetrafluoroethylene is used.

溶接管１８は、第１管体１４の端面と第２管体１６の端面とを溶接することにより、これらの溶接部の外周面側と内周面側にバリ２２、２４が発生している。溶接時に、第１管体１４の端面と第２管体１６の端面にまたがってマンドル２６が挿入されていることにより、溶接部の外周面側のバリ２２に比べて内周面側のバリ２４の発生が抑制され、内周面側のバリ２４が外周面側のバリ２２よりも小さい構成となっている。   The welded pipe 18 welds the end face of the first tubular body 14 and the end face of the second tubular body 16, thereby generating burrs 22 and 24 on the outer peripheral surface side and the inner peripheral surface side of these welded portions. . At the time of welding, the mandrel 26 is inserted across the end surface of the first tube body 14 and the end surface of the second tube body 16, so that the burr 24 on the inner peripheral surface side compared to the burr 22 on the outer peripheral surface side of the welded portion. The burrs 24 on the inner peripheral surface side are smaller than the burrs 22 on the outer peripheral surface side.

次に、本発明の一実施形態の管体溶接方法であって、第１管体１４の端面と第２管体１６の端面とを溶接する方法について説明する。   Next, a method for welding a tubular body according to an embodiment of the present invention, in which the end surface of the first tubular body 14 and the end surface of the second tubular body 16 are welded, will be described.

図３に示されるように、まず装着工程によりマンドル２６に芯金具１０の第１管体１４と第２管体１６とを差し込む。次いで、位置合わせ工程により、マンドル２６の軸方向端部を芯金具１０の中間部２０及びホース接続部１２に挿入することで、マンドル２６の外周面と第１管体１４の内周面１４Ａ及び第２管体１６の内周面１６Ａとの間隔を周方向に沿ってほぼ一定となるように位置合わせする。   As shown in FIG. 3, first, the first tubular body 14 and the second tubular body 16 of the core metal fitting 10 are inserted into the mandrel 26 by the mounting process. Next, by inserting the axial end of the mandrel 26 into the intermediate part 20 and the hose connection part 12 of the core metal 10 by the alignment step, the outer peripheral surface of the mandrel 26 and the inner peripheral surface 14A of the first tubular body 14 and The second pipe body 16 is aligned so that the distance from the inner peripheral surface 16A of the second tubular body 16 is substantially constant along the circumferential direction.

次いで、溶接工程により、第１管体１４の軸方向の端面と第２管体１６の軸方向の端面とを突き合わせ、この状態で外部から第１管体１４の端面と第２管体１６の端面とを溶接する。溶接は、例えば超音波又は第１管体１４の端面と第２管体１６の端面とを加熱することにより第１管体１４の端面と第２管体１６の端面とを溶融させると共に、両者を軸方向に圧接することにより行う。   Next, the end face in the axial direction of the first tubular body 14 and the end face in the axial direction of the second tubular body 16 are abutted by a welding process, and in this state, the end face of the first tubular body 14 and the second tubular body 16 are externally contacted. Weld the end faces. In welding, for example, the end face of the first tubular body 14 and the end face of the second tubular body 16 are melted by heating ultrasonic waves or the end face of the first tubular body 14 and the end face of the second tubular body 16. By pressing in the axial direction.

溶接により第１管体１４の端面と第２管体１６の端面との溶接部の外周面側と内周面側にバリ２２、２４が発生する。そのとき、第１管体１４の端面と第２管体１６の端面にまたがるようにマンドル２６が挿入されていることにより、第１管体１４の端面と第２管体１６の端面との溶接部の内周面側へ発生しようとするバリ２４がマンドル２６に当接する。これにより、第１管体１４の端面と第２管体１６の端面との溶接部の内周面側へのバリ２４の発生を抑制することができ、溶接部の外周面側のバリ２２に比べて内周面側のバリ２４が小さくなる。   Burrs 22 and 24 are generated on the outer peripheral surface side and the inner peripheral surface side of the welded portion between the end surface of the first tube body 14 and the end surface of the second tube body 16 by welding. At that time, since the mandrel 26 is inserted so as to straddle the end surface of the first tube body 14 and the end surface of the second tube body 16, the end surface of the first tube body 14 and the end surface of the second tube body 16 are welded. The burr 24 to be generated toward the inner peripheral surface side of the portion abuts on the mandrel 26. Thereby, generation | occurrence | production of the burr | flash 24 to the inner peripheral surface side of the welding part of the end surface of the 1st pipe body 14 and the end surface of the 2nd pipe body 16 can be suppressed, and the burr | flash 22 of the outer peripheral surface side of a welding part can be made. In comparison, the burr 24 on the inner peripheral surface side becomes smaller.

第１管体１４の端面と第２管体１６の端面の溶接後、引抜工程によりマンドル２６を溶接管１８から軸方向に引き抜く。マンドル２６は、第１管体１４及び第２管体１６よりも軟化点の高い材料で構成されており、溶接時にマンドル２６が溶融して溶接管１８に固着するのを防止することができる。また、マンドル２６の外周面に、第１管体１４及び第２管体１６の内周面よりも摩擦係数の小さい材料からなるコーティング層２７が形成されていることにより、マンドル２６の外周面に溶融した母材が固着しにくく、マンドル２６を容易に引き抜くことができる。   After welding the end face of the first tubular body 14 and the end face of the second tubular body 16, the mandle 26 is pulled out from the welded pipe 18 in the axial direction by a drawing process. The mandrel 26 is made of a material having a higher softening point than the first tube body 14 and the second tube body 16, and can prevent the mandrel 26 from melting and adhering to the welded tube 18 during welding. In addition, since the coating layer 27 made of a material having a smaller friction coefficient than the inner peripheral surfaces of the first tube body 14 and the second tube body 16 is formed on the outer peripheral surface of the mandrel 26, The molten base material is difficult to adhere and the mandrel 26 can be easily pulled out.

このような溶接管１８では、第１管体１４の端面と第２管体１６の端面との溶接部の内周面側へのバリ２４の発生を抑制することができ、溶接管１８の内部に液体等を通すときに、バリ２４を切断しなくても溶接管１８の流路を確保することができる。本実施形態では、図１に示されるように、第１管体１４の端面と第２管体１６の端面との溶接部の内周面側へバリ２４が発生しているが、バリ２４の内径は、ホース接続部１２の内径とほぼ同じであり、バリ２４が液体の流れを妨げることはない。例えば、第１管体１４及び第２管体１６の外径が３０ｍｍ、内径が２９ｍｍであるとき、第１管体１４及び第２管体１６の内周面との間隔が約０．５ｍｍとなるようなマンドル２６を挿入して第１管体１４の端面と第２管体１６の端面とを溶接すると、バリ２４の内径は２８．５ｍｍ程度となる。この場合、切削加工でバリ２４を除去しなくても溶接管１８の流路を確保することができ、工数の削減につながる。一方、第１管体１４及び第２管体１６の内部にマンドル２６を挿入しない場合には、バリの内径は２６ｍｍ程度となり、溶接管の流路が狭くなり、液体の流れを妨げる可能性がある。   In such a welded pipe 18, it is possible to suppress the generation of burrs 24 on the inner peripheral surface side of the welded portion between the end face of the first pipe body 14 and the end face of the second pipe body 16. When passing liquid or the like through, the flow path of the welded pipe 18 can be secured without cutting the burr 24. In this embodiment, as shown in FIG. 1, the burr 24 is generated on the inner peripheral surface side of the welded portion between the end surface of the first tube body 14 and the end surface of the second tube body 16. The inner diameter is substantially the same as the inner diameter of the hose connection portion 12, and the burr 24 does not hinder the flow of liquid. For example, when the outer diameters of the first tube body 14 and the second tube body 16 are 30 mm and the inner diameter is 29 mm, the distance between the inner surfaces of the first tube body 14 and the second tube body 16 is about 0.5 mm. When the mandrel 26 is inserted and the end surface of the first tube body 14 and the end surface of the second tube body 16 are welded, the inner diameter of the burr 24 becomes about 28.5 mm. In this case, the flow path of the welded pipe 18 can be secured without removing the burr 24 by cutting, leading to a reduction in man-hours. On the other hand, when the mandrel 26 is not inserted into the first tube body 14 and the second tube body 16, the inner diameter of the burr is about 26 mm, the flow path of the welded tube is narrowed, and the liquid flow may be hindered. is there.

次に、図４を用いて本発明の第２実施形態である溶接管５２を備えた芯金具５０について説明する。なお、第１実施形態と同一構成部分には同一の符号を付し、重複した説明は省略する。   Next, the core metal fitting 50 provided with the welded pipe 52 which is 2nd Embodiment of this invention is demonstrated using FIG. In addition, the same code | symbol is attached | subjected to the same component as 1st Embodiment, and the overlapping description is abbreviate | omitted.

図４に示されるように、芯金具５０の第１管体１４の端面と第２管体１６の端面との溶接時には、第１管体１４の端面と第２管体１６の端面にまたがるようにマンドル５８を挿入する。マンドル５８の外周面には、第１管体１４の端面と第２管体１６の端面と対向する位置に、軸方向の先端部側（芯金具５０の中間部２０側）に行くにしたがって外径が小さくなるテーパー面５８Ａが形成されている。マンドル５８の先端部は、第１管体１４の端面と第２管体１６の端面との溶接位置より奥側であって第１管体１４の内周面と対向する位置（中間部２０に到達しない位置）まで挿入されている。   As shown in FIG. 4, when welding the end surface of the first tubular body 14 and the end surface of the second tubular body 16 of the core metal fitting 50, it spans over the end surface of the first tubular body 14 and the end surface of the second tubular body 16. Insert the mandle 58 into the On the outer peripheral surface of the mandrel 58, the outer surface of the mandrel 58 moves outward toward the tip end side in the axial direction (on the intermediate portion 20 side of the core fitting 50) at a position facing the end face of the first tubular body 14 and the end face of the second tubular body 16. A tapered surface 58A having a reduced diameter is formed. The tip of the mandrel 58 is located behind the welding position of the end surface of the first tube body 14 and the end surface of the second tube body 16 and is positioned opposite the inner peripheral surface of the first tube body 14 (on the intermediate portion 20). It is inserted to the position that does not reach.

マンドル５８のテーパー面５８Ａより軸方向中央部側の外径は、第２管体１６の内周面１６Ａの内径よりも若干小さく形成されており、マンドル５８を第２管体１６に挿入したときにマンドル５８のガタツキが抑制される。そして、第１管体１４の端面及び第２管体１６の端面と対向するテーパー面５８Ａの位置によって、マンドル２６の外周面と第１管体１４の内周面１４Ａ及び第２管体１６の内周面１６Ａとの間隔が周方向に沿ってほぼ一定となるように位置合わせされる。第１管体１４の端面及び第２管体１６の端面とマンドル５８のテーパー面５８Ａとの間隔は、０．３〜２．０ｍｍに設定されることが好ましい。   The outer diameter of the mandrel 58 on the axial center side with respect to the tapered surface 58A is formed slightly smaller than the inner diameter of the inner peripheral surface 16A of the second tubular body 16, and the mandrel 58 is inserted into the second tubular body 16. Further, rattling of the mandle 58 is suppressed. And the outer peripheral surface of the mandrel 26, the inner peripheral surface 14A of the first tubular body 14, and the second tubular body 16 depending on the position of the tapered surface 58A facing the end surface of the first tubular body 14 and the end surface of the second tubular body 16. Positioning is performed so that the distance from the inner peripheral surface 16A is substantially constant along the circumferential direction. The distance between the end surface of the first tube body 14 and the end surface of the second tube body 16 and the tapered surface 58A of the mandrel 58 is preferably set to 0.3 to 2.0 mm.

第１管体１４の端面と第２管体１６の端面との溶接時には、溶接部の外周面側と内周面側にバリ５４、５６が発生し、マンドル５８のテーパー面５８Ａによって内周面側のバリ５６の発生が抑制される。これによって、溶接管５２の内周面側のバリ５６が外周面側のバリ５４よりも小さくなる。溶接後に溶接管５２の内部からマンドル５８を引き抜く際には、マンドル５８にテーパー面５８Ａが形成されていることにより、第１実施形態のマンドル２６と比較してマンドル５８を溶接管５２からより一層引き抜きやすくなる。   During welding of the end surface of the first tubular body 14 and the end surface of the second tubular body 16, burrs 54 and 56 are generated on the outer peripheral surface side and the inner peripheral surface side of the welded portion, and the inner peripheral surface is formed by the tapered surface 58A of the mandrel 58. The generation of the side burr 56 is suppressed. As a result, the burr 56 on the inner peripheral surface side of the welded pipe 52 becomes smaller than the burr 54 on the outer peripheral surface side. When the mandrel 58 is pulled out from the inside of the welded pipe 52 after welding, the mandrel 58 is further formed from the welded pipe 52 than the mandrel 26 of the first embodiment because the mandrel 58 is formed with the tapered surface 58A. It becomes easy to pull out.

図５には、比較例に係る溶接管１０２を備えた芯金具１００が示されている。芯金具１００は、第１管体１４の端面と第２管体１６の端面とを突き合わせて溶接するときに、第１管体１４及び第２管体１６の内部には規制する部材がなく、第１管体１４の端面と第２管体１６の端面の溶接部の外周面側と内周面側にほぼ同じ大きさのバリ１０４が発生する。溶接部の内周面側に発生したバリ１０４は、溶接管１０２の流路の一部を塞ぐため、第１管体１４の端面と第２管体１６の端面の溶接部の内部にドリル１０６を挿入してバリ１０４を除去する必要があり、工数がかかる。これに対して、本実施形態の溶接管１８、５２では、バリ２４、５６を除去しなくても溶接管１８の流路を確保することができるため、工数を削減することができる。   FIG. 5 shows a core fitting 100 including a welded pipe 102 according to a comparative example. When the metal core 100 is welded by abutting the end surface of the first tube body 14 and the end surface of the second tube body 16, there is no regulating member inside the first tube body 14 and the second tube body 16. Burrs 104 having substantially the same size are generated on the outer peripheral surface side and the inner peripheral surface side of the welded portion of the end surface of the first tube body 14 and the end surface of the second tube body 16. The burrs 104 generated on the inner peripheral surface side of the welded portion block a part of the flow path of the welded pipe 102, so that a drill 106 is formed inside the welded portion of the end surface of the first tube body 14 and the end surface of the second tube body 16. Need to be inserted to remove the burrs 104, which takes time. On the other hand, in the welded pipes 18 and 52 of this embodiment, since the flow path of the welded pipe 18 can be secured without removing the burrs 24 and 56, the number of man-hours can be reduced.

なお、マンドルの形状や、第１管体１４の端面及び第２管体１６の端面とマンドルとの間隔は、上述した実施形態に限定されず、他の構成でもよい。   The shape of the mandrel and the distance between the end surface of the first tubular body 14 and the end surface of the second tubular body 16 and the mandrel are not limited to the above-described embodiments, and other configurations may be used.

なお、上述した実施形態では、芯金具に溶接管を設けたが、これに限定されず、他の継手や金属部品に本発明の金属製溶接管を設けてもよい。   In the above-described embodiment, the welded pipe is provided on the core metal. However, the present invention is not limited to this, and the metal welded pipe of the present invention may be provided in another joint or metal part.

本発明の第１実施形態に係る溶接管を用いた芯金具の溶接後の状態を示す断面図である。It is sectional drawing which shows the state after the welding of the core metal fitting using the welding pipe which concerns on 1st Embodiment of this invention. 本発明の第１実施形態に係る溶接管を用いた芯金具の溶接後の状態を示す半裁断面図である。It is a half-cut sectional view which shows the state after the welding of the core metal fitting using the welding pipe which concerns on 1st Embodiment of this invention. 本発明の第１実施形態に係る溶接管を用いた芯金具の溶接前の状態を示す断面図である。It is sectional drawing which shows the state before welding of the metal core using the welding pipe which concerns on 1st Embodiment of this invention. 本発明の第２実施形態に係る溶接管を用いた芯金具の溶接後の状態を示す断面図である。It is sectional drawing which shows the state after the welding of the metal core using the welded pipe which concerns on 2nd Embodiment of this invention. 比較例に係る溶接管を用いた芯金具の溶接後の状態を示す断面図である。It is sectional drawing which shows the state after welding of the core metal fitting using the welding pipe which concerns on a comparative example.

符号の説明Explanation of symbols

１０ 芯金具
１４ 第１管体（金属製管体）
１６ 第２管体（金属製管体）
１８ 溶接管（金属製溶接管）
２２ 外周面側のバリ
２４ 内周面側のバリ
２６ マンドル（規制部材）
２７ コーティング層
５０ 芯金具
５２ 溶接管（金属製溶接管）
５４ 外周面側のバリ
５６ 内周面側のバリ
５８ マンドル（規制部材）
５８Ａ テーパー面 10 core metal fitting 14 first tube (metal tube)
16 Second pipe (metal pipe)
18 Welded pipe (metal welded pipe)
22 Outer burrs 24 Inner burrs 26 Mandles (regulators)
27 Coating Layer 50 Core Fitting 52 Welded Pipe (Metal Welded Pipe)
54 Burr 56 on the outer peripheral surface 56 Burr 58 on the inner peripheral surface 58 Mandle (regulating member)
58A Tapered surface

Claims (8)

断面が円形の規制部材に２つの金属製管体を差し込む装着工程と、
前記規制部材の外周面と前記２つの金属製管体の内周面との間隔を周方向に沿って一定とする位置合わせ工程と、
前記２つの金属製管体の端面を突き合わせて外部から溶接する溶接工程と、
突き合わせ溶接された前記金属製管体から前記規制部材を引き抜く引抜工程と、
を有する管体溶接方法。 A mounting step of inserting two metal pipes into a regulating member having a circular cross section;
An alignment step in which the distance between the outer peripheral surface of the restricting member and the inner peripheral surface of the two metal tube bodies is constant along the circumferential direction;
A welding process in which end faces of the two metal pipes are butted from the outside, and
A drawing step of pulling out the regulating member from the metal pipe body butt welded;
A tube welding method comprising: 前記規制部材が、前記金属製管体よりも軟化点の高い材料で構成されている請求項１に記載の管体溶接方法。   The tubular body welding method according to claim 1, wherein the regulating member is made of a material having a softening point higher than that of the metallic tubular body. 前記規制部材の表面に、前記金属製管体よりも摩擦係数の小さい材料からなるコーティング層が形成されている請求項１又は請求項２に記載の管体溶接方法。   The pipe body welding method according to claim 1 or 2, wherein a coating layer made of a material having a smaller friction coefficient than the metal pipe body is formed on a surface of the regulating member. 前記金属製管体の内周面と前記規制部材の外周面との間隔が、０．３〜２．０ｍｍに設定されている請求項１から請求項３までのいずれか１項に記載の管体溶接方法。   The pipe according to any one of claims 1 to 3, wherein an interval between an inner peripheral surface of the metal pipe body and an outer peripheral surface of the regulating member is set to 0.3 to 2.0 mm. Body welding method. 前記金属製管体の一方の長手方向における端面側の内径が奥部の内径より大きく形成され、前記規制部材の外周面を前記奥部に挿入することにより、前記端面側の内周面と前記規制部材の外周面との間隔を保持する請求項１から請求項４までのいずれか１項に記載の管体溶接方法。   The inner diameter of the end face side in one longitudinal direction of the metallic tube body is formed larger than the inner diameter of the inner part, and the outer peripheral surface of the restricting member is inserted into the inner part, whereby the inner peripheral surface on the end face side and the The pipe body welding method according to any one of claims 1 to 4, wherein a distance from the outer peripheral surface of the restricting member is maintained. 前記規制部材の先端部の外周面に当該先端部側に行くにしたがって小径となるテーパー面を備え、前記金属製管体の内周面と前記テーパー面の外周面との間隔を保持する請求項１から請求項４までのいずれか１項に記載の管体溶接方法。   A tapered surface having a smaller diameter toward the distal end side is provided on the outer peripheral surface of the distal end portion of the restriction member, and an interval between the inner peripheral surface of the metal tube body and the outer peripheral surface of the tapered surface is maintained. The pipe body welding method according to any one of claims 1 to 4. 請求項１から請求項６までのいずれか１項に記載の管体溶接方法を用いて溶接された金属製溶接管であって、
前記２つの金属製管体の端面を突き合わせて溶接された溶接部の内周面側のバリが外周面側のバリよりも小さい構成とされた金属製溶接管。 A metal welded pipe welded using the pipe welding method according to any one of claims 1 to 6,
A metal welded pipe having a configuration in which a burr on the inner peripheral surface side of a welded portion welded by abutting end surfaces of the two metal pipe bodies is smaller than a burr on the outer peripheral surface side. ホースが接続される継手の芯金具であって、軸方向端部に請求項７に記載の金属製溶接管を備える芯金具。   A metal core for a joint to which a hose is connected, comprising the metal welded pipe according to claim 7 at an axial end.
JP2008335146A 2008-12-26 2008-12-26 Pipe welding method, metal welded pipe and core metal fitting Expired - Fee Related JP5301267B2 (en)

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EP3421770A1 (en) * 2017-06-27 2019-01-02 Mahle International GmbH Method for producing a piston for a combustion engine from a piston upper part and a piston lower part
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JP7401733B2 (en) 2019-09-11 2023-12-20 横浜ゴム株式会社 fittings

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