JP6986401B2 - Resistance welding equipment - Google Patents

Resistance welding equipment Download PDF

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JP6986401B2
JP6986401B2 JP2017182178A JP2017182178A JP6986401B2 JP 6986401 B2 JP6986401 B2 JP 6986401B2 JP 2017182178 A JP2017182178 A JP 2017182178A JP 2017182178 A JP2017182178 A JP 2017182178A JP 6986401 B2 JP6986401 B2 JP 6986401B2
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electrode
holding
resistance welding
holding member
bracket
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JP2019055421A (en
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太郎 藤波
卓 坂下
護 金子
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KYB Corp
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KYB Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/10—Spot welding; Stitch welding
    • B23K11/11—Spot welding

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  • Mechanical Engineering (AREA)
  • Resistance Welding (AREA)

Description

本発明は抵抗溶接装置に関する。 The present invention relates to a resistance welding apparatus.

特許文献１は従来の抵抗溶接装置を開示している。この抵抗溶接装置は、第１耐熱部品と第２耐熱部品とを抵抗溶接により溶接する。抵抗溶接装置は、第１棒状電極と第２棒状電極の２つの電極を備えており、第１棒状電極は第１耐熱部品に当接し、第２棒状電極は第２耐熱部品に当接する。そして、抵抗溶接装置は、第１耐熱部品を第２耐熱部品の接合面上に載置した状態で、第１棒状電極と第２棒状電極とを互いに接近する方向に相対移動させ、これにより第１耐熱部品と第２耐熱部品とを互いに接近する方向に加圧するとともに、第１耐熱部品と第２耐熱部品との間に電流を流して溶接を行う。 Patent Document 1 discloses a conventional resistance welding apparatus. This resistance welding device welds the first heat-resistant component and the second heat-resistant component by resistance welding. The resistance welding device includes two electrodes, a first rod-shaped electrode and a second rod-shaped electrode. The first rod-shaped electrode abuts on the first heat-resistant component, and the second rod-shaped electrode abuts on the second heat-resistant component. Then, the resistance welding apparatus moves the first rod-shaped electrode and the second rod-shaped electrode relative to each other in a state where the first heat-resistant component is placed on the joint surface of the second heat-resistant component, whereby the first rod-shaped electrode and the second rod-shaped electrode are moved relative to each other. 1 The heat-resistant component and the second heat-resistant component are pressurized in a direction close to each other, and a current is passed between the first heat-resistant component and the second heat-resistant component to perform welding.

特開２００２−２４８５７７号公報Japanese Unexamined Patent Publication No. 2002-248577

ところで、抵抗溶接装置の電極は、電気伝導性が良好で安価な銅製が採用されることが多いが、銅製の電極は摩耗しやすい。また、従来の抵抗溶接装置においては、電極はワークの保持も行う。このため、少なくとも一方の電極のワーク保持面の形状が変化すると、ワークを適切に保持できなくなるおそれがある。そして、ワークを適切に保持できなくなると、溶接の品質に影響を及ぼしてしまう。 By the way, the electrodes of the resistance welding apparatus are often made of copper, which has good electrical conductivity and is inexpensive, but the copper electrodes are easily worn. Further, in the conventional resistance welding apparatus, the electrode also holds the work. Therefore, if the shape of the work holding surface of at least one of the electrodes changes, the work may not be held properly. If the work cannot be held properly, the quality of welding will be affected.

本発明は、上記従来の実情に鑑みてなされたものであって、溶接品質の安定化を図ることができる抵抗溶接装置を提供することを解決すべき課題としている。 The present invention has been made in view of the above-mentioned conventional circumstances, and it is an object to be solved to provide a resistance welding apparatus capable of stabilizing welding quality.

本発明の抵抗溶接装置は、第１部材と第２部材とを当接させて互いに接近する方向に加圧し、電流を流して溶接する装置である。抵抗溶接装置は、第１電極、第２電極、及び第１保持部材を備えている。第１電極は、付勢されつつ第１部材に当接する。第２電極は、第１電極に対向して配され、第２部材に当接する。第１保持部材は、第１部材を保持する第１保持面を有し、この第１保持面により第１部材を第２部材の方向に押圧する。また、第１保持部材は、第１電極に対する電気絶縁性を有している。そして、第１保持部材は、第１保持面側に開口する挿通孔に第１電極を摺動自在に挿通している。 The resistance welding apparatus of the present invention is an apparatus in which a first member and a second member are brought into contact with each other, pressurized in a direction approaching each other, and a current is passed through the welding apparatus. The resistance welding device includes a first electrode, a second electrode, and a first holding member. The first electrode abuts on the first member while being urged. The second electrode is arranged to face the first electrode and abuts on the second member. The first holding member has a first holding surface for holding the first member, and the first holding surface presses the first member in the direction of the second member. Further, the first holding member has electrical insulation with respect to the first electrode. Then, in the first holding member, the first electrode is slidably inserted into the insertion hole opened on the first holding surface side.

このように、本発明の抵抗溶接装置は、通電するための部材である電極とは別に、保持するための部材である第１保持部材を備えている。そして、第１保持部材と第１電極とは別部材であるため、夫々異なる材料で形成することができる。このため、第１保持部材に用いる材料を、通電性とは別の観点、例えば、耐摩耗性等の観点で選択することができる。その結果、従来のように銅製の電極で保持する場合と比較して、安定したワーク保持を実現しつつ、耐久性の向上を図ることができる。 As described above, the resistance welding apparatus of the present invention includes a first holding member which is a member for holding, in addition to the electrode which is a member for energizing. Since the first holding member and the first electrode are separate members, they can be formed of different materials. Therefore, the material used for the first holding member can be selected from a viewpoint different from the current conductivity, for example, from the viewpoint of wear resistance and the like. As a result, it is possible to improve the durability while realizing stable work holding as compared with the case of holding with a copper electrode as in the conventional case.

したがって、本発明の抵抗溶接装置は、溶接品質の安定化を図ることができる。 Therefore, the resistance welding apparatus of the present invention can stabilize the welding quality.

本発明の抵抗溶接装置において、第１部材は、断面円弧状に形成された第１円弧状部を有している。そして、第１保持面は、第１円弧状部の外周面を保持する断面Ｖ字状に形成されている。このため、円弧状面を有する第１部材を第１保持面で好適に保持できる。また、異なる曲率の円弧状面を有する異なる種類の第１部材を、共通の第１保持部材で保持することができる。その結果、治具数の低減を図ることができる。 In the resistance welding apparatus of the present invention, the first member, Ru Tei has a first arcuate portion formed in an arc-shaped cross section. The first holding surface, Ru Tei is formed in V-shaped cross section for holding the outer peripheral surface of the first arcuate portion. Thus, the first member having an arcuate surface can be suitably held at the first holding surface. Further, different types of first members having arcuate surfaces having different curvatures can be held by a common first holding member. As a result, the number of jigs can be reduced.

本発明の抵抗溶接装置において、挿通孔は、第１保持面を挟んで第１保持面の両側に形成され得る。そして、第１電極は、第１保持面を挟んだ両側の挿通孔の夫々に挿通され得る。この場合、第１保持面の大きさに関わらず、安定したワークの保持を維持しつつ、第１電極の第１部材との当接面積をより増加することができる。また、第１保持面を挟んだ両側から電流を分散して流すことができ、電流密度が集中するのを緩和することができる。 In the resistance welding apparatus of the present invention, insertion holes may be formed on both sides of the first holding surface with the first holding surface interposed therebetween. Then, the first electrode can be inserted into each of the insertion holes on both sides of the first holding surface. In this case, regardless of the size of the first holding surface, the contact area of the first electrode with the first member can be further increased while maintaining stable holding of the work. Further, the current can be dispersed and flowed from both sides of the first holding surface, and the concentration of the current density can be alleviated.

本発明の抵抗溶接装置は、第１保持部材に対向して配されるとともに、第２部材を保持する第２保持面を有する第２保持部材を備えている。第２部材は、断面円弧状に形成された第２円弧状部を有しており、第２保持面は、第２円弧状部の外周面を保持する断面Ｖ字状に形成されている。そして、第１保持面の内角の角度と第２保持面の内角の角度は異なっている。このため、異なる曲率の円弧状面を有する異なる種類の第１部材と第２部材の組み合わせに対して、１組の第１保持部材と第２保持部材で好適に保持することができる。このように、１組の第１保持部材及び第２保持部材で複数種類の異なる第１部材及び第２部材の組み合わせに対応することができるので、治具交換頻度の低減を図ることができる。
また、本発明の抵抗溶接装置において、第１円弧状部の内周面には、周方向に間隔を空けて設けられた複数の突起が形成され得る。そして、第１保持面は、複数の突起よりも周方向の外側において第１円弧状部の外周面を保持し得る。
Resistance welding apparatus of the present invention, together arranged to face the first holding member, Ru Tei includes a second holding member having a second holding surface for holding the second member. The second member has a second arcuate portion formed in an arc-shaped cross section, the second holding surface, Ru Tei is formed in V-shaped cross section for holding the outer peripheral surface of the second arcuate portion. The angle and the angle of the interior angle of the second holding surface of the interior angle of the first holding surface Ru different Ttei. Therefore, for a combination of different types of first and second members having an arcuate surface having different curvatures it can be suitably held in a pair of first holding member and the second holding member. As described above, since one set of the first holding member and the second holding member can correspond to a plurality of different combinations of the first member and the second member, it is possible to reduce the jig replacement frequency.
Further, in the resistance welding apparatus of the present invention, a plurality of protrusions provided at intervals in the circumferential direction may be formed on the inner peripheral surface of the first arcuate portion. Then, the first holding surface can hold the outer peripheral surface of the first arcuate portion outside the plurality of protrusions in the circumferential direction.

本発明の抵抗溶接装置は、第１保持部を第１保持面による押圧方向に駆動する駆動手段と、第１電極を第１保持部材に形成された挿通孔から突出させる方向に付勢して第１部材に当接させる付勢手段と、を備え得る。この場合、第１電極の第１部材との当接面が摩耗したとしても、第１電極を第１保持部材とは別に付勢し、第１電極を第１部材確実に当接させて第１部材を好適に加圧することができる。その結果、安定した通電を実現できる。 In the resistance welding apparatus of the present invention, the driving means for driving the first holding portion in the pressing direction by the first holding surface and the first electrode are urged in the direction of projecting from the insertion hole formed in the first holding member. It may be provided with an urging means for contacting the first member. In this case, even if the contact surface of the first electrode with the first member is worn, the first electrode is urged separately from the first holding member, and the first electrode is surely brought into contact with the first member. One member can be suitably pressurized. As a result, stable energization can be realized.

実施形態１の抵抗溶接装置を模式的に示す正面図である。It is a front view which shows typically the resistance welding apparatus of Embodiment 1. 実施形態１に係る第１電極、第１保持部材、及びヘッドユニットを示す部分断面拡大図である。It is a partial cross-sectional enlarged view which shows the 1st electrode, the 1st holding member, and the head unit which concerns on Embodiment 1. FIG. 実施形態１に係る第２電極、第２保持部材、及びベースユニットを示す部分断面拡大図である。It is a partial cross-sectional enlarged view which shows the 2nd electrode, the 2nd holding member, and the base unit which concerns on Embodiment 1. FIG. 実施形態１の抵抗溶接装置において、アウターチューブ及びブラケットを第２保持部材上に位置決め載置した状態を示す図である。It is a figure which shows the state which the outer tube and the bracket are positioned and placed on the 2nd holding member in the resistance welding apparatus of Embodiment 1. FIG. 実施形態１の抵抗溶接装置において、第１保持部材をブラケットに当接させ、第１保持面によりブラケットを保持した状態を示す図である。It is a figure which shows the state which the 1st holding member was brought into contact with a bracket, and the bracket was held by the 1st holding surface in the resistance welding apparatus of Embodiment 1. FIG. 図５の部分拡大図である。It is a partially enlarged view of FIG. 実施形態１の抵抗溶接装置において、アウターチューブとブラケットの抵抗溶接が完了した状態を模式的に示す拡大断面図である。FIG. 5 is an enlarged cross-sectional view schematically showing a state in which resistance welding of an outer tube and a bracket is completed in the resistance welding apparatus of the first embodiment. 実施形態２に係る第１電極、及び第１保持部材を示す拡大斜視図である。It is an enlarged perspective view which shows the 1st electrode and 1st holding member which concerns on Embodiment 2. FIG.

本発明の抵抗溶接装置を具体化した実施形態１及び２について、図面を参照しつつ説明する。なお、以下の実施形態では、溶接される２部材として、複筒式油圧ダンパのアウターチューブと、その外周面に取り付けられるブラケットを例示する。 Embodiments 1 and 2 embodying the resistance welding apparatus of the present invention will be described with reference to the drawings. In the following embodiment, the outer tube of the double-cylinder hydraulic damper and the bracket attached to the outer peripheral surface thereof are exemplified as the two members to be welded.

＜実施形態１＞
実施形態１の抵抗溶接装置１は、ブラケット２（本発明に係る第１部材として例示する）とアウターチューブ３（本発明に係る第２部材として例示する）とを当接させ、互いに接近する方向に加圧し、電流を流して溶接する装置である。図１に示すように、ブラケット２は、断面略円弧状に形成された円弧状部２Ａ（本発明に係る第１円弧状部として例示する）を有している。また、ブラケット２は、この円弧状部２Ａの内周面に形成された複数の突起２Ｂを有している。ブラケット２は、略円筒状のアウターチューブ３の外周面に円弧状部２Ａの内周面を当接させ、加圧及び通電することにより突起２Ｂが溶融してアウターチューブ３に接合される。すなわち、ブラケット２とアウターチューブ３とはプロジェクション溶接により接合され、これらを溶接する抵抗溶接装置１はプロジェクション溶接装置である。 <Embodiment 1>
In the resistance welding apparatus 1 of the first embodiment, the bracket 2 (exemplified as the first member according to the present invention) and the outer tube 3 (exemplified as the second member according to the present invention) are brought into contact with each other and approach each other. It is a device that pressurizes and applies an electric current to weld. As shown in FIG. 1, the bracket 2 has an arcuate portion 2A (exemplified as a first arcuate portion according to the present invention) formed in a substantially arcuate cross section. Further, the bracket 2 has a plurality of protrusions 2B formed on the inner peripheral surface of the arcuate portion 2A. In the bracket 2, the inner peripheral surface of the arcuate portion 2A is brought into contact with the outer peripheral surface of the substantially cylindrical outer tube 3, and the protrusion 2B is melted and joined to the outer tube 3 by pressurizing and energizing. That is, the bracket 2 and the outer tube 3 are joined by projection welding, and the resistance welding device 1 for welding these is a projection welding device.

図１〜図３に示すように、抵抗溶接装置１は、第１電極１０、第２電極２０、及び第１保持部材３０を備えている。また、抵抗溶接装置１は第２保持部材４０を備えている。第１電極１０は、ブラケット２の方向に付勢されつつブラケット２に当接する。第１電極１０は銅製で断面長円状の円柱形状をなしている。第２電極２０は、第１電極１０に対向して配置されており、アウターチューブ３に当接する。第２電極２０は、第１電極１０と同様に、銅製で断面長円状の円柱形状をなしている。 As shown in FIGS. 1 to 3, the resistance welding apparatus 1 includes a first electrode 10, a second electrode 20, and a first holding member 30. Further, the resistance welding device 1 includes a second holding member 40. The first electrode 10 abuts on the bracket 2 while being urged in the direction of the bracket 2. The first electrode 10 is made of copper and has a cylindrical shape having an elongated circular cross section. The second electrode 20 is arranged to face the first electrode 10 and abuts on the outer tube 3. Like the first electrode 10, the second electrode 20 is made of copper and has a cylindrical shape having an oval cross section.

第１保持部材３０はブラケット２を加圧方向に押圧する。第１保持部材３０は、略円筒状に形成された本体部３１と、本体部３１の外周面が拡径されてフランジ状に形成されたフランジ部３２とを有している。本体部３１には、軸方向に貫通する挿通孔３３が形成されている。挿通孔３３には第１電極１０が摺動自在に挿通されている。また、本体部３１には第１Ｖ字状面３４（本発明に係る第１保持面として例示する）が形成されている。第１Ｖ字状面３４は、本体部３１の軸方向の端面の一方に形成されている。第１Ｖ字状面３４は断面略Ｖ字の凹状に形成されており、内角の角度がθ１をなす２面でブラケット２の円弧状部２Ａの外周面に当接し、ブラケット２を保持する。内角の角度θ１は、ブラケット２の円弧状部２Ａに当接したときに、突起２Ｂの近傍に当接する角度として設定されている。第１保持部材３０は第１電極１０に対して電気絶縁性を有している。具体的には、第１保持部材３０は、工具鋼に絶縁コーティングを施して構成されている。これにより、第１保持部材３０は、耐摩耗性に優れるとともに、挿通孔３３に挿通されている第１電極１０とは電気的に絶縁されている。 The first holding member 30 presses the bracket 2 in the pressurizing direction. The first holding member 30 has a main body portion 31 formed in a substantially cylindrical shape, and a flange portion 32 formed in a flange shape by expanding the outer peripheral surface of the main body portion 31. The main body 31 is formed with an insertion hole 33 penetrating in the axial direction. The first electrode 10 is slidably inserted into the insertion hole 33. Further, a first V-shaped surface 34 (exemplified as a first holding surface according to the present invention) is formed on the main body portion 31. The first V-shaped surface 34 is formed on one of the axial end faces of the main body portion 31. The first V-shaped surface 34 is formed in a concave shape having a substantially V-shaped cross section, and has two surfaces having an internal angle of θ1 that abuts on the outer peripheral surface of the arcuate portion 2A of the bracket 2 to hold the bracket 2. The angle θ1 of the internal angle is set as an angle that abuts in the vicinity of the protrusion 2B when it abuts on the arcuate portion 2A of the bracket 2. The first holding member 30 has electrical insulation with respect to the first electrode 10. Specifically, the first holding member 30 is configured by applying an insulating coating to the tool steel. As a result, the first holding member 30 is excellent in wear resistance and is electrically insulated from the first electrode 10 inserted through the insertion hole 33.

第２保持部材４０は、第２電極２０に対する電気絶縁性を有し、第１保持部材３０に対向して配置されている。第２保持部材４０は、第１保持部材３０と略同様の本体部４１、フランジ部４２、挿通孔４３、及び第２Ｖ字状面４４（本発明に係る第２保持面として例示する）を有している。すなわち、第２保持部材４０は、略円筒状に形成された本体部４１と、本体部４１の外周面が拡径されてフランジ状に形成されたフランジ部４２と、本体部４１の軸方向に貫通する挿通孔４３と、本体部４１の一方の端面に形成された第２Ｖ字状面４４とを有している。しかし、第２Ｖ字状面４４の内角の角度θ２は、第１Ｖ字状面３４の内角の角度θ１とは異なっている。具体的には、ブラケット２の円弧状部２Ａの外周面を保持する第１Ｖ字状面３４の内角の角度θ１は、アウターチューブ３の外周面を保持する第２Ｖ字状面４４の内角の角度θ２よりも大きく設定されている。第２保持部材４０は、第１保持部材３０と同様に、工具鋼に絶縁コーティングを施してなる。 The second holding member 40 has electrical insulation with respect to the second electrode 20, and is arranged so as to face the first holding member 30. The second holding member 40 has a main body portion 41, a flange portion 42, an insertion hole 43, and a second V-shaped surface 44 (exemplified as a second holding surface according to the present invention) substantially similar to the first holding member 30. is doing. That is, the second holding member 40 has a main body portion 41 formed in a substantially cylindrical shape, a flange portion 42 formed in a flange shape by expanding the outer peripheral surface of the main body portion 41, and the main body portion 41 in the axial direction. It has an insertion hole 43 through which it penetrates, and a second V-shaped surface 44 formed on one end surface of the main body portion 41. However, the angle θ2 of the internal angle of the second V-shaped surface 44 is different from the angle θ1 of the internal angle of the first V-shaped surface 34. Specifically, the angle θ1 of the inner angle of the first V-shaped surface 34 that holds the outer peripheral surface of the arcuate portion 2A of the bracket 2 is the angle of the inner angle of the second V-shaped surface 44 that holds the outer peripheral surface of the outer tube 3. It is set larger than θ2. The second holding member 40 is made by applying an insulating coating to the tool steel in the same manner as the first holding member 30.

また、抵抗溶接装置１は、ヘッドユニット５０及びベースユニット６０を備えている。ヘッドユニット５０は、図示しないサーボモータを動力源として、上下に移動自在に設けられている。本実施形態において、本発明に係る駆動手段は、このサーボモータを有して構成されているといえる。ベースユニット６０は、ヘッドユニット５０に対向する位置に固定配置されている。すなわち、ヘッドユニット５０及びベースユニット６０は上下に対向して配置されているとともに、ヘッドユニット５０の上下動により近接及び離間自在に設けられている。ヘッドユニット５０には第１電極１０及び第１保持部材３０が取り付けられる。ベースユニット６０には第２電極２０及び第２保持部材４０が取り付けられる。抵抗溶接装置１は、ヘッドユニット５０がベースユニット６０方向へ移動することで、第１保持部材３０によるブラケット２のアウターチューブ３方向への押圧を実現している。 Further, the resistance welding device 1 includes a head unit 50 and a base unit 60. The head unit 50 is provided so as to be movable up and down using a servomotor (not shown) as a power source. In the present embodiment, it can be said that the drive means according to the present invention is configured to have this servomotor. The base unit 60 is fixedly arranged at a position facing the head unit 50. That is, the head unit 50 and the base unit 60 are arranged so as to face each other in the vertical direction, and are provided so as to be close to and separated from each other by the vertical movement of the head unit 50. A first electrode 10 and a first holding member 30 are attached to the head unit 50. A second electrode 20 and a second holding member 40 are attached to the base unit 60. In the resistance welding device 1, the head unit 50 moves in the direction of the base unit 60, so that the first holding member 30 presses the bracket 2 in the outer tube 3 direction.

図２に示すように、ヘッドユニット５０は、取付部５１、給電部５２、及び付勢部５３を有している。取付部５１は、ヘッドユニット５０の下面部に設けられており、第１保持部材３０が取り付けられる。第１保持部材３０は、本体部３１の外周面が取付部５１に形成された嵌合孔５１Ａに嵌め込まれるとともに、フランジ部３２の一方の面が取付部５１に当接する形態で、ヘッドユニット５０に取り付けられる。 As shown in FIG. 2, the head unit 50 has a mounting portion 51, a feeding portion 52, and an urging portion 53. The mounting portion 51 is provided on the lower surface portion of the head unit 50, and the first holding member 30 is mounted. The head unit 50 has a form in which the outer peripheral surface of the main body 31 is fitted into the fitting hole 51A formed in the mounting portion 51, and one surface of the flange portion 32 abuts on the mounting portion 51. Attached to.

給電部５２は第１電極１０に給電する。給電部５２は、可動電極５２Ａと、給電ブラシ５２Ｂとを具備している。可動電極５２Ａは略円柱状に形成されており、その中心軸を加圧方向と同じ方向に向けて配置されている。可動電極５２Ａは加圧方向に摺動自在に設けられている。また、可動電極５２Ａは、その下端面が第１電極１０の上端面に当接する。給電ブラシ５２Ｂは、可動電極５２Ａの側面に当接して、可動電極５２Ａを介して第１電極１０に電流を供給する。給電ブラシ５２Ｂは、電流の安定供給を図るために、可動電極５２Ａの周方向に等間隔で３つ（１２０°等配）設けられている。 The feeding unit 52 feeds the first electrode 10. The feeding unit 52 includes a movable electrode 52A and a feeding brush 52B. The movable electrode 52A is formed in a substantially columnar shape, and its central axis is arranged in the same direction as the pressurizing direction. The movable electrode 52A is provided so as to be slidable in the pressurizing direction. Further, the lower end surface of the movable electrode 52A comes into contact with the upper end surface of the first electrode 10. The feeding brush 52B abuts on the side surface of the movable electrode 52A and supplies a current to the first electrode 10 via the movable electrode 52A. Three feeding brushes 52B are provided at equal intervals (equal distribution of 120 °) in the circumferential direction of the movable electrode 52A in order to ensure a stable supply of current.

付勢部５３は、圧縮空気の圧力により可動電極５２Ａを軸方向に付勢する。具体的には、付勢部５３は、有底筒状に形成されたシリンダ５３Ａと、このシリンダ５３Ａ内に摺動自在に収納されたピストン５３Ｂとを具備している。ピストン５３Ｂには可動電極５２Ａの上端部が連結されている。付勢部５３は、エア供給口５４からシリンダ５３Ａ内に供給される圧縮空気によりピストン５３Ｂが摺動する方向へ付勢力を発生させる。付勢部５３による付勢力は、ピストン５３Ｂに連結された可動電極５２Ａを介して第１電極１０に伝達される。すなわち、付勢部５３による付勢力は、第１電極１０をブラケット２に付勢する力として作用する。本実施形態において、本発明に係る付勢手段は、これら付勢部５３、可動電極５２Ａを有して構成されているといえる。 The urging portion 53 urges the movable electrode 52A in the axial direction by the pressure of the compressed air. Specifically, the urging portion 53 includes a cylinder 53A formed in a bottomed cylinder shape and a piston 53B slidably housed in the cylinder 53A. The upper end of the movable electrode 52A is connected to the piston 53B. The urging unit 53 generates an urging force in the direction in which the piston 53B slides by the compressed air supplied from the air supply port 54 into the cylinder 53A. The urging force by the urging portion 53 is transmitted to the first electrode 10 via the movable electrode 52A connected to the piston 53B. That is, the urging force by the urging portion 53 acts as a force for urging the first electrode 10 to the bracket 2. In the present embodiment, it can be said that the urging means according to the present invention includes the urging portion 53 and the movable electrode 52A.

図３に示すように、ベースユニット６０は、ヘッドユニット５０と略同様の構成とされている。すなわち、ベースユニット６０は、取付部６１、給電部６２、及び付勢部６３を有している。取付部６１は、ベースユニット６０の上面部に設けられており、第２保持部材４０が取り付けられる。第２保持部材４０は、本体部４１の外周面が取付部６１に形成された嵌合孔６１Ａに嵌め込まれるとともに、フランジ部４２の一方の面が取付部６１に当接する形態で、ベースユニット６０に取り付けられる。 As shown in FIG. 3, the base unit 60 has substantially the same configuration as the head unit 50. That is, the base unit 60 has a mounting portion 61, a feeding portion 62, and an urging portion 63. The mounting portion 61 is provided on the upper surface portion of the base unit 60, and the second holding member 40 is mounted. The base unit 60 has a form in which the outer peripheral surface of the main body 41 is fitted into the fitting hole 61A formed in the mounting portion 61, and one surface of the flange portion 42 abuts on the mounting portion 61. Attached to.

給電部６２は第２電極２０に給電する。給電部６２は、可動電極６２Ａと、給電ブラシ６２Ｂとを具備している。可動電極６２Ａは略円柱状に形成されており、その中心軸を加圧方向と同じ方向に向けて配置されている。可動電極６２Ａは加圧方向に摺動自在に設けられている。また、可動電極６２Ａは、その上端面が第２電極２０の下端面に当接する。給電ブラシ６２Ｂは、可動電極６２Ａの側面に当接して、可動電極６２Ａを介して第２電極２０に電流を供給する。給電ブラシ６２Ｂは可動電極６２Ａの周方向に等間隔（１２０°等配）で３つ設けられている。 The feeding unit 62 supplies power to the second electrode 20. The feeding unit 62 includes a movable electrode 62A and a feeding brush 62B. The movable electrode 62A is formed in a substantially columnar shape, and its central axis is arranged in the same direction as the pressurizing direction. The movable electrode 62A is provided so as to be slidable in the pressurizing direction. Further, the upper end surface of the movable electrode 62A comes into contact with the lower end surface of the second electrode 20. The feeding brush 62B abuts on the side surface of the movable electrode 62A and supplies a current to the second electrode 20 via the movable electrode 62A. Three feeding brushes 62B are provided at equal intervals (120 ° equal distribution) in the circumferential direction of the movable electrode 62A.

付勢部６３は、有底筒状に形成されたシリンダ６３Ａと、このシリンダ６３Ａ内に摺動自在に収納されたピストン６３Ｂとを具備している。ピストン６３Ｂには可動電極６２Ａの下端部が連結されている。付勢部６３は、エア供給口６４からシリンダ６３Ａ内に供給される圧縮空気によりピストン６３Ｂが摺動する方向へ付勢力を発生させる。この付勢力は可動電極６２Ａを介して第２電極２０に伝達される。すなわち、付勢部６３による付勢力は、第２電極２０をアウターチューブ３に付勢する力として作用する。 The urging portion 63 includes a cylinder 63A formed in the shape of a bottomed cylinder, and a piston 63B slidably housed in the cylinder 63A. The lower end of the movable electrode 62A is connected to the piston 63B. The urging unit 63 generates an urging force in the direction in which the piston 63B slides by the compressed air supplied from the air supply port 64 into the cylinder 63A. This urging force is transmitted to the second electrode 20 via the movable electrode 62A. That is, the urging force by the urging portion 63 acts as a force for urging the second electrode 20 to the outer tube 3.

このような構成を有する抵抗溶接装置１は、次に示すようにしてブラケット２とアウターチューブ３を溶接する。最初に、アウターチューブ３を第２保持部材４０上に載置するとともに、ブラケット２をアウターチューブ３上に載置して位置決めする。具体的には、図４に示すように、第２保持部材４０の第２Ｖ字状面４４にアウターチューブ３の外周面を保持させるとともに、アウターチューブ３の外周面にブラケット２の円弧状部２Ａの内周面を当接させる。次に、上昇位置で待機しているヘッドユニット５０をベースユニット６０に向けて移動させる。これにより、第１保持部材３０の第１Ｖ字状面３４がブラケット２の円弧状部２Ａの外周面に当接するとともに、ブラケット２及びアウターチューブ３が第１保持部材３０及び第２保持部材４０に挟持されて位置保持される（図１参照）。 The resistance welding device 1 having such a configuration welds the bracket 2 and the outer tube 3 as shown below. First, the outer tube 3 is placed on the second holding member 40, and the bracket 2 is placed on the outer tube 3 for positioning. Specifically, as shown in FIG. 4, the outer peripheral surface of the outer tube 3 is held by the second V-shaped surface 44 of the second holding member 40, and the arcuate portion 2A of the bracket 2 is held on the outer peripheral surface of the outer tube 3. The inner peripheral surface of the surface is brought into contact with the surface. Next, the head unit 50 waiting in the ascending position is moved toward the base unit 60. As a result, the first V-shaped surface 34 of the first holding member 30 comes into contact with the outer peripheral surface of the arcuate portion 2A of the bracket 2, and the bracket 2 and the outer tube 3 are brought into the first holding member 30 and the second holding member 40. It is pinched and held in position (see FIG. 1).

この時、ブラケット２は、加圧された状態でアウターチューブ３に当接している。すなわち、第１保持部材３０は、ブラケット２を加圧方向に押圧している。これにより、ブラケット２とアウターチューブ３は、当接し合うとともに、互いが接近する方向に加圧された状態とされている。また、ブラケット２は、突起２Ｂの近傍において、第１Ｖ字状面３４に当接されている。換言すると、ブラケット２を押圧する第１保持部材３０の第１Ｖ字状面３４は、突起２Ｂの近傍位置にてブラケット２の外周面に当接している。 At this time, the bracket 2 is in contact with the outer tube 3 in a pressurized state. That is, the first holding member 30 presses the bracket 2 in the pressurizing direction. As a result, the bracket 2 and the outer tube 3 are in contact with each other and are in a state of being pressurized in a direction in which they approach each other. Further, the bracket 2 is in contact with the first V-shaped surface 34 in the vicinity of the protrusion 2B. In other words, the first V-shaped surface 34 of the first holding member 30 that presses the bracket 2 is in contact with the outer peripheral surface of the bracket 2 at a position near the protrusion 2B.

次に、図５に示すように、第１電極１０及び第２電極２０に付勢力を夫々付与する。具体的には、付勢部５３，６３に圧縮空気を夫々供給し、可動電極５２Ａ，６２Ａを軸方向に夫々付勢する。可動電極５２Ａ，６２Ａは、第１電極１０及び第２電極２０に夫々当接しており、これにより、第１電極１０及び第２電極２０は、付勢力が付与された状態でブラケット２及びアウターチューブ３に各々当接する。これにより、第１電極１０と第２電極２０とが、ブラケット２及びアウターチューブ３を介して電気的導通する。 Next, as shown in FIG. 5, an urging force is applied to the first electrode 10 and the second electrode 20, respectively. Specifically, compressed air is supplied to the urging portions 53 and 63, respectively, and the movable electrodes 52A and 62A are urged in the axial direction, respectively. The movable electrodes 52A and 62A are in contact with the first electrode 10 and the second electrode 20, respectively, so that the first electrode 10 and the second electrode 20 are in a state where the urging force is applied to the bracket 2 and the outer tube. Each of 3 is in contact with each other. As a result, the first electrode 10 and the second electrode 20 are electrically conductive via the bracket 2 and the outer tube 3.

そして、第１電極１０及び第２電極２０に通電する。この時、図６に示すように、付勢部５３，６３による付勢力により、第１電極１０とブラケット２、及び第２電極２０とアウターチューブ３が、夫々確実に当接しており、溶接のための十分な電流が確実に流れる。 Then, the first electrode 10 and the second electrode 20 are energized. At this time, as shown in FIG. 6, the first electrode 10 and the bracket 2, and the second electrode 20 and the outer tube 3 are surely in contact with each other due to the urging force of the urging portions 53 and 63, and the welding is performed. Sufficient current will surely flow.

通電されたブラケット２及びアウターチューブ３は、突起２Ｂとその周辺が溶融・軟化して接合される。この時、ブラケット２は、第１保持部材３０により加圧され、アウターチューブ３に押し付けられている。これにより、図７に示すように、突起２Ｂは押し潰され、円弧状部２Ａの内周面がアウターチューブ３の外周面に略面接触した状態で当接する。また、ブラケット２を押圧する第１Ｖ字状面３４は、突起２Ｂの近傍位置でブラケット２に当接しているので、突起２Ｂを押し潰して２部材を接合する力として押圧力を有効に作用させている。 The energized bracket 2 and the outer tube 3 are joined by melting and softening the protrusion 2B and its periphery. At this time, the bracket 2 is pressurized by the first holding member 30 and pressed against the outer tube 3. As a result, as shown in FIG. 7, the protrusion 2B is crushed, and the inner peripheral surface of the arcuate portion 2A comes into contact with the outer peripheral surface of the outer tube 3 in a substantially surface contact state. Further, since the first V-shaped surface 34 that presses the bracket 2 is in contact with the bracket 2 at a position near the protrusion 2B, the pressing force is effectively applied as a force for crushing the protrusion 2B and joining the two members. ing.

以上説明したように、本実施形態１の抵抗溶接装置１は、第１部材であるブラケット２と第２部材であるアウターチューブ３とを当接させて互いに接近する方向に加圧し、電流を流して溶接する。抵抗溶接装置１は、第１電極１０、第２電極２０、及び第１保持部材３０を備えている。第１電極１０は、付勢されつつブラケット２に当接する。第２電極２０は、第１電極１０に対向して配され、アウターチューブ３に当接する。第１保持部材３０は、ブラケット２を保持する第１保持面である第１Ｖ字状面３４を有し、この第１Ｖ字状面３４によりブラケット２をアウターチューブ３の方向に押圧する。また、第１保持部材３０は、第１電極１０に対する電気絶縁性を有している。そして、第１保持部材３０は、第１Ｖ字状面３４側に開口する挿通孔３３に第１電極１０を摺動自在に挿通している。 As described above, the resistance welding apparatus 1 of the first embodiment brings the bracket 2 which is the first member and the outer tube 3 which is the second member into contact with each other, pressurizes them in a direction approaching each other, and causes an electric current to flow. And weld. The resistance welding device 1 includes a first electrode 10, a second electrode 20, and a first holding member 30. The first electrode 10 comes into contact with the bracket 2 while being urged. The second electrode 20 is arranged to face the first electrode 10 and abuts on the outer tube 3. The first holding member 30 has a first V-shaped surface 34 which is a first holding surface for holding the bracket 2, and the bracket 2 is pressed toward the outer tube 3 by the first V-shaped surface 34. Further, the first holding member 30 has electrical insulation with respect to the first electrode 10. The first holding member 30 slidably inserts the first electrode 10 into the insertion hole 33 that opens on the side of the first V-shaped surface 34.

このように、抵抗溶接装置１は、通電するための部材である第１電極１０とは別に、保持するための部材である第１保持部材３０を備えている。そして、第１保持部材３０と第１電極１０とは別部材であるため、夫々異なる材料で形成することができる。本実施形態１の抵抗溶接装置１では、第１保持部材３０に用いる材料として、耐摩耗性の観点から工具鋼を採用している。その結果、従来の銅製の電極で保持する場合と比較して、安定したワーク保持を実現しつつ、耐久性の向上を図ることができる。 As described above, the resistance welding device 1 includes a first holding member 30 which is a member for holding, in addition to the first electrode 10 which is a member for energizing. Since the first holding member 30 and the first electrode 10 are separate members, they can be formed of different materials. In the resistance welding apparatus 1 of the first embodiment, tool steel is used as the material used for the first holding member 30 from the viewpoint of wear resistance. As a result, it is possible to improve the durability while realizing stable work holding as compared with the case of holding with the conventional copper electrode.

したがって、本実施形態１の抵抗溶接装置１は、溶接品質の安定化を図ることができる。 Therefore, the resistance welding apparatus 1 of the first embodiment can stabilize the welding quality.

また、抵抗溶接装置１は、第１部材としてのブラケット２が、断面円弧状に形成された円弧状部２Ａを有している。そして、第１保持面としての第１Ｖ字状面３４は、断面円弧状に形成された円弧状部２Ａの外周面を保持する断面Ｖ字状に形成されている。このため、ブラケット２の円弧状部２Ａを第１Ｖ字状面３４で安定して保持できる。また、異なる曲率の円弧状部２Ａを有する異なる種類の第１部材を、共通の第１保持部材３０で保持することができる。その結果、治具数の低減を期待できる。 Further, in the resistance welding device 1, the bracket 2 as the first member has an arcuate portion 2A formed in an arcuate cross section. The first V-shaped surface 34 as the first holding surface is formed in a V-shaped cross section that holds the outer peripheral surface of the arc-shaped portion 2A formed in an arc-shaped cross section. Therefore, the arcuate portion 2A of the bracket 2 can be stably held by the first V-shaped surface 34. Further, different types of first members having arcuate portions 2A having different curvatures can be held by the common first holding member 30. As a result, a reduction in the number of jigs can be expected.

また、抵抗溶接装置１は、第１保持部材３０に対向して配されるとともに、アウターチューブ３を保持する第２保持面である第２Ｖ字状面４４を有する第２保持部材４０を備える。アウターチューブ３は、本発明に係る第２円弧状部としての筒体の外周面を有している。第２Ｖ字状面４４は、このアウターチューブ３の外周面を保持する断面Ｖ字状に形成されている。そして、第１Ｖ字状面３４の内角の角度θ１と第２Ｖ字状面４４の内角の角度θ２は異なっている。このため、異なる曲率の円弧状面を有する異なる種類のブラケットとアウターチューブなど、異なる種類の第１部材及び第２部材の組み合わせに対して、１組の第１保持部材と第２保持部材で好適に保持することができる。このように、１組の第１保持部材３０及び第２保持部材４０で複数種類の異なるブラケット２及びアウターチューブ３の組み合わせに対応することができるので、治具交換頻度の低減を図ることができる。 Further, the resistance welding device 1 includes a second holding member 40 which is arranged to face the first holding member 30 and has a second V-shaped surface 44 which is a second holding surface for holding the outer tube 3. The outer tube 3 has an outer peripheral surface of a cylinder as a second arcuate portion according to the present invention. The second V-shaped surface 44 is formed in a V-shaped cross section that holds the outer peripheral surface of the outer tube 3. The angle θ1 of the internal angle of the first V-shaped surface 34 and the angle θ2 of the internal angle of the second V-shaped surface 44 are different. Therefore, a set of first holding member and second holding member is suitable for a combination of different types of first member and second member such as different types of brackets and outer tubes having arcuate surfaces having different curvatures. Can be held in. As described above, since the set of the first holding member 30 and the second holding member 40 can correspond to a plurality of different combinations of the bracket 2 and the outer tube 3, it is possible to reduce the jig replacement frequency. ..

また、抵抗溶接装置１は、第１電極１０を付勢しつつブラケット２に当接させている。そして、この付勢力は第１保持部材３０による押圧力とは別の力である。すなわち、第１電極１０をブラケット２に当接させるための付勢力を付与する付勢手段と、第１保持部材３０を含むヘッドユニット５０全体をブラケット２の方向に押圧駆動するための駆動手段と、を別々に設けている。このため、第１電極１０のブラケット２との当接面が摩耗したとしても、第１電極１０を第１保持部材３０とは別に付勢し、第１電極１０をブラケット２に確実に当接させてブラケット２を好適に加圧することができ、安定した通電を実現できる。 Further, the resistance welding device 1 is in contact with the bracket 2 while urging the first electrode 10. And this urging force is a force different from the pushing pressure by the first holding member 30. That is, an urging means for applying an urging force for bringing the first electrode 10 into contact with the bracket 2, and a driving means for pressing and driving the entire head unit 50 including the first holding member 30 in the direction of the bracket 2. , Are provided separately. Therefore, even if the contact surface of the first electrode 10 with the bracket 2 is worn, the first electrode 10 is urged separately from the first holding member 30, and the first electrode 10 is reliably brought into contact with the bracket 2. The bracket 2 can be suitably pressurized, and stable energization can be realized.

また、抵抗溶接装置１は、第２電極２０を付勢しつつアウターチューブ３に当接させている。このため、第２電極２０のアウターチューブ３との当接面が摩耗したとしても、第２電極２０をアウターチューブ３に確実に当接させてアウターチューブ３を好適に加圧することができ、安定した通電を実現できる。 Further, the resistance welding device 1 is in contact with the outer tube 3 while urging the second electrode 20. Therefore, even if the contact surface of the second electrode 20 with the outer tube 3 is worn, the second electrode 20 can be reliably brought into contact with the outer tube 3 and the outer tube 3 can be appropriately pressurized, which is stable. It is possible to realize the energization.

また、抵抗溶接装置１は、給電部５２，６２が、可動電極５２Ａ，６２Ａ及び給電ブラシ５２Ｂ，６２Ｂを夫々具備している。給電ブラシ５２Ｂ，６２Ｂは可動電極５２Ａ，６２Ａの周方向の３箇所に等間隔に夫々配置されている。このようなにより、可動電極５２Ａ，６２Ａに電流を安定して供給することができる。 Further, in the resistance welding device 1, the feeding portions 52 and 62 are provided with movable electrodes 52A and 62A and feeding brushes 52B and 62B, respectively. The feeding brushes 52B and 62B are arranged at three locations in the circumferential direction of the movable electrodes 52A and 62A at equal intervals, respectively. As a result, the current can be stably supplied to the movable electrodes 52A and 62A.

また、抵抗溶接装置１は、ブラケット２をアウターチューブ３の方向に押圧する第１Ｖ字状面３４が、突起２Ｂの近傍位置でブラケット２に当接する。このため、通電されて溶融した突起２Ｂを確実に押し潰すことができ、ブラケット２とアウターチューブ３の溶接を好適に行うことができる。 Further, in the resistance welding device 1, the first V-shaped surface 34 that presses the bracket 2 in the direction of the outer tube 3 comes into contact with the bracket 2 at a position near the protrusion 2B. Therefore, the protrusion 2B that has been energized and melted can be reliably crushed, and the bracket 2 and the outer tube 3 can be suitably welded.

＜実施形態２＞
次に、図８などを参照し、実施形態２について説明する。
実施形態２の抵抗溶接装置は、第１電極２１０が、第１保持面であるＶ字状面２３４を挟んだ両側に設けられている点において、実施形態１の抵抗溶接装置１とは異なる。その他の部分は、実施形態１と略同一の構成をなし、同一の機能を有する。よって、他の部分については実施形態１と同一の符号を付し、詳細な説明は省略する。 <Embodiment 2>
Next, the second embodiment will be described with reference to FIG. 8 and the like.
The resistance welding apparatus 1 of the second embodiment is different from the resistance welding apparatus 1 of the first embodiment in that the first electrode 210 is provided on both sides of the V-shaped surface 234 which is the first holding surface. The other parts have substantially the same configuration as that of the first embodiment and have the same functions. Therefore, the other parts are designated by the same reference numerals as those in the first embodiment, and detailed description thereof will be omitted.

図８に示すように、第１保持部材２３０は、Ｖ字状面２３４側に開口し、Ｖ字状面２３４を挟んだ両側に挿通孔２３３が形成されている。挿通孔２３３は半月状に開口する孔である。第１保持部材２３０は、実施形態１と同様に、工具鋼に絶縁コーティングを施して形成されている。第１電極２１０は、銅製で、円柱の一端にすり割溝を形成した形態で設けられており、側面視において他端が連結されたＵ字状をなしている。第１電極２１０は、第１保持部材２３０に形成された半月状に開口する挿通孔２３３から挿通されている。第１電極２１０は、その下端面がＶ字状面２３４を挟んだ両側に配置されて挿通孔２３３内を摺動自在に設けられており、図８の２点鎖線で示す方向に移動可能である。また、第１電極２１０のワークとの当接面２１０Ａは、第１保持部材２３０の保持面であるＶ字状面と同様の断面略Ｖ字の凹状に形成されており、Ｖ字状面２３４を挟んだ４面でワークの外周面に当接する。 As shown in FIG. 8, the first holding member 230 is opened on the V-shaped surface 234 side, and insertion holes 233 are formed on both sides of the V-shaped surface 234. The insertion hole 233 is a hole that opens like a half moon. The first holding member 230 is formed by applying an insulating coating to the tool steel as in the first embodiment. The first electrode 210 is made of copper and is provided in a form in which a split groove is formed at one end of a cylinder, and has a U-shape in which the other ends are connected in a side view. The first electrode 210 is inserted through a half-moon-shaped opening hole 233 formed in the first holding member 230. The lower end surface of the first electrode 210 is arranged on both sides of the V-shaped surface 234 and is slidably provided in the insertion hole 233, and can be moved in the direction shown by the two-dot chain line in FIG. be. Further, the contact surface 210A of the first electrode 210 with the work is formed in a concave shape having a substantially V-shaped cross section similar to the V-shaped surface which is the holding surface of the first holding member 230, and the V-shaped surface 234. It abuts on the outer peripheral surface of the work with four surfaces sandwiching the.

このような構成の抵抗溶接装置は、実施形態１の抵抗溶接装置１と同様の作用効果を奏する。また、第１保持部材２３０は第１電極２１０とは別部材であり、工具鋼にて形成している。このため、保持部材としての耐久性の向上を図ることができ、安定したワーク保持を実現できる。 The resistance welding device having such a configuration has the same effect as that of the resistance welding device 1 of the first embodiment. Further, the first holding member 230 is a separate member from the first electrode 210 and is made of tool steel. Therefore, the durability of the holding member can be improved, and stable work holding can be realized.

また、第１電極２１０を、Ｖ字状面２３４を挟んだ両側に設けたので、Ｖ字状面２３４の大きさに関わらず、安定した第１部材の保持を維持しつつ、第１電極２１０の第１部材との当接面積を確保することができる。また、Ｖ字状面２３４を挟んだ両側から電流を分散して流すことができ、電流密度の集中を緩和することができる。さらに、第１電極２１０のワークとの当接面２１０Ａは断面Ｖ字状に形成されているので、実施形態１と比較してワークとの当接箇所が多くなる。その結果、電流をより分散して流すことができ、電流密度の集中をより緩和することができる。 Further, since the first electrode 210 is provided on both sides of the V-shaped surface 234, the first electrode 210 maintains stable holding of the first member regardless of the size of the V-shaped surface 234. The contact area with the first member of the above can be secured. Further, the current can be dispersed and flowed from both sides of the V-shaped surface 234, and the concentration of the current density can be relaxed. Further, since the contact surface 210A of the first electrode 210 with the work is formed in a V-shaped cross section, there are more contact points with the work as compared with the first embodiment. As a result, the current can be more dispersed and flowed, and the concentration of the current density can be further relaxed.

本発明は上記記述及び図面によって説明した実施形態１及び２に限定されるものではなく、例えば次のような実施形態も本発明の技術的範囲に含まれる。
（１）実施形態１及び２では、円弧状部を有するワークを保持するために、保持面としてのＶ字状面を有する保持部材を夫々例示したが、保持部材の保持面の形状は限定されず、溶接するワークの形状に応じた保持面を有していることが好ましい。
（２）実施形態１及び２に示した特定構成の保持部材及び電極は、ヘッドユニット又はベースユニットのいずれか一方にのみ設けられていてもよい。この場合、対となる他方には既知の保持治具、電極等を採用することができる。
（３）実施形態１及び２では、上下方向でワークを挟み込む抵抗溶接装置を例示したが、これに限定されず、横方向など、上下方向以外の方向で挟持する形態であってもよい。すなわち、ヘッドユニット及びベースユニットの相対移動の方向や電極の摺動方向、加圧方向等は上下に限定されるものではない。
（４）実施形態１及び２では、保持部材の材質として工具鋼を例示したが、これに限定されず、種々の材質を採用することができる。保持部材としては、工具鋼の他、セラミックスなどの耐摩耗性に優れた材質を採用することが好ましい。
（５）実施形態１及び２では、電極の材質として銅を例示したが、これに限定されず、種々の材質を採用することができる。電極としては、電気伝導性に優れた材質を採用することが好ましい。 The present invention is not limited to the first and second embodiments described above and the drawings, and for example, the following embodiments are also included in the technical scope of the present invention.
(1) In the first and second embodiments, a holding member having a V-shaped surface as a holding surface is exemplified in order to hold a work having an arcuate portion, but the shape of the holding surface of the holding member is limited. Instead, it is preferable to have a holding surface according to the shape of the work to be welded.
(2) The holding members and electrodes having the specific configurations shown in the first and second embodiments may be provided only on either the head unit or the base unit. In this case, a known holding jig, electrode, or the like can be used for the other pair.
(3) In the first and second embodiments, the resistance welding device that sandwiches the work in the vertical direction is exemplified, but the present invention is not limited to this, and the device may be sandwiched in a direction other than the vertical direction such as the horizontal direction. That is, the relative movement direction of the head unit and the base unit, the sliding direction of the electrodes, the pressurizing direction, and the like are not limited to the vertical direction.
(4) In the first and second embodiments, tool steel is exemplified as the material of the holding member, but the material is not limited to this, and various materials can be adopted. As the holding member, it is preferable to use a material having excellent wear resistance such as ceramics in addition to tool steel.
(5) In the first and second embodiments, copper is exemplified as the material of the electrode, but the present invention is not limited to this, and various materials can be adopted. As the electrode, it is preferable to use a material having excellent electrical conductivity.

１…抵抗溶接装置、２…ブラケット（第１部材）、２Ａ…第１円弧状部、２Ｂ…突起、３…アウターチューブ（第２部材）、１０，２１０…第１電極、２０…第２電極、３０，２３０…第１保持部材、３１，４１…本体部、３２，４２…フランジ部、３３，４３，２３３…挿通孔、３４…第１Ｖ字状面（第１保持面）、４０…第２保持部材、４４…第２Ｖ字状面（第２保持面）、５０…ヘッドユニット、５１，６１…取付部、５１Ａ，６１Ａ…嵌合孔、５２，６２…給電部、５２Ａ，６２Ａ…可動電極、５２Ｂ，６２Ｂ…給電ブラシ、５３，６３…付勢部、５３Ａ，６３Ａ…シリンダ、５３Ｂ，６３Ｂ…ピストン、５４，６４…エア供給口、６０…ベースユニット、２３４…Ｖ字状面（第１保持面）、θ１…第１Ｖ字状面の内角の角度、θ２…第２Ｖ字状面の内角の角度 1 ... resistance welding device, 2 ... bracket (first member), 2A ... first arcuate part, 2B ... protrusion, 3 ... outer tube (second member), 10,210 ... first electrode, 20 ... second electrode , 30, 230 ... First holding member, 31, 41 ... Main body portion, 32, 42 ... Flange portion, 33, 43, 233 ... Insertion hole, 34 ... First V-shaped surface (first holding surface), 40 ... 2 Holding member, 44 ... 2nd V-shaped surface (second holding surface), 50 ... Head unit, 51, 61 ... Mounting part, 51A, 61A ... Fitting hole, 52, 62 ... Feeding part, 52A, 62A ... Movable Electrodes, 52B, 62B ... Feeding brush, 53, 63 ... Bouncer, 53A, 63A ... Cylinder, 53B, 63B ... Piston, 54, 64 ... Air supply port, 60 ... Base unit, 234 ... V-shaped surface (No. 1 holding surface), θ1… the angle of the internal angle of the first V-shaped surface, θ2… the angle of the internal angle of the second V-shaped surface

Claims (4)

第１部材と第２部材とを当接させて互いに接近する方向に加圧し、電流を流して溶接する抵抗溶接装置であって、
付勢されつつ前記第１部材に当接する第１電極と、
前記第１電極に対向して配され、前記第２部材に当接する第２電極と、
前記第１部材を保持する第１保持面を有し、前記第１保持面により前記第１部材を前記第２部材の方向に押圧する第１保持部材と、
前記第１保持部材に対向して配されるとともに、前記第２部材を保持する第２保持面を有する第２保持部材と、
を備えており、
前記第１保持部材は、前記第１電極に対する電気絶縁性を有しており、且つ前記第１保持面側に開口する挿通孔に前記第１電極を摺動自在に挿通しており、
前記第１部材は、断面円弧状に形成された第１円弧状部を有しており、
前記第１保持面は、前記第１円弧状部の外周面を保持する断面Ｖ字状に形成されており、
前記第２部材は、断面円弧状に形成された第２円弧状部を有しており、
前記第２保持面は、前記第２円弧状部の外周面を保持する断面Ｖ字状に形成されており、
前記第１保持面の内角の角度と前記第２保持面の内角の角度は異なっていることを特徴とする抵抗溶接装置。 It is a resistance welding device that brings the first member and the second member into contact with each other, pressurizes them in a direction approaching each other, and applies an electric current to weld them.
The first electrode that comes into contact with the first member while being urged,
The second electrode, which is arranged to face the first electrode and abuts on the second member,
A first holding member having a first holding surface for holding the first member and pressing the first member in the direction of the second member by the first holding surface.
A second holding member which is arranged to face the first holding member and has a second holding surface for holding the second member.
Equipped with
The first holding member has electrical insulation with respect to the first electrode, and the first electrode is slidably inserted into an insertion hole opened on the first holding surface side .
The first member has a first arcuate portion formed in an arcuate cross section.
The first holding surface is formed in a V-shaped cross section for holding the outer peripheral surface of the first arc-shaped portion.
The second member has a second arcuate portion formed in an arcuate cross section.
The second holding surface is formed in a V-shaped cross section for holding the outer peripheral surface of the second arc-shaped portion.
A resistance welding apparatus characterized in that the angle of the internal angle of the first holding surface and the angle of the internal angle of the second holding surface are different. 前記挿通孔は、前記第１保持面を挟んで前記第１保持面の両側に形成されており、
前記第１電極は、前記第１保持面を挟んだ両側の前記挿通孔の夫々に挿通されていることを特徴とする請求項１に記載の抵抗溶接装置。 The insertion holes are formed on both sides of the first holding surface with the first holding surface interposed therebetween.
The resistance welding apparatus according to claim 1, wherein the first electrode is inserted into each of the insertion holes on both sides of the first holding surface. 前記第１保持部材を前記第１保持面による押圧方向に駆動する駆動手段と、
前記第１電極を前記挿通孔から突出させる方向に付勢して前記第１部材に当接させる付勢手段と、を備えることを特徴とする請求項１又は請求項２に記載の抵抗溶接装置。 Driving means for driving the first holding member in the pressing direction by the first holding surface,
The resistance welding apparatus according to claim 1 or 2 , further comprising an urging means for urging the first electrode in a direction of projecting from the insertion hole to bring the first electrode into contact with the first member. .. 前記第１円弧状部の内周面には、周方向に間隔を空けて設けられて前記第２円弧状部の外周面に当接する複数の突起が形成されており、On the inner peripheral surface of the first arc-shaped portion, a plurality of protrusions provided at intervals in the circumferential direction and in contact with the outer peripheral surface of the second arc-shaped portion are formed.
前記第１保持面は、前記複数の突起よりも周方向の外側において前記第１円弧状部の外周面を保持することを特徴とする請求項１乃至請求項３のいずれか一項に記載の抵抗溶接装置。The first aspect according to any one of claims 1 to 3, wherein the first holding surface holds the outer peripheral surface of the first arcuate portion on the outer side in the circumferential direction from the plurality of protrusions. Resistance welding equipment.
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