JP4284928B2 - Resistance welding machine - Google Patents

Resistance welding machine Download PDF

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Publication number
JP4284928B2
JP4284928B2 JP2002173110A JP2002173110A JP4284928B2 JP 4284928 B2 JP4284928 B2 JP 4284928B2 JP 2002173110 A JP2002173110 A JP 2002173110A JP 2002173110 A JP2002173110 A JP 2002173110A JP 4284928 B2 JP4284928 B2 JP 4284928B2
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Japan
Prior art keywords
cylindrical part
collet
cylindrical
peripheral surface
resistance welding
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Expired - Fee Related
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JP2002173110A
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Japanese (ja)
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JP2004017070A (en
Inventor
龍也 井▲土▼
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Aisin AW Co Ltd
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Aisin AW Co Ltd
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Priority to JP2002173110A priority Critical patent/JP4284928B2/en
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Description

【0001】
【技術分野】
本発明は,円筒部品の端面を他の部材に抵抗溶接する抵抗溶接機に関する。
【0002】
【従来技術】
抵抗溶接を実施するに当たっては,接合すべき部品を相互に当接させると共に,各部品に,それぞれ電極を接触させる。そして,これらの電極間に電流を流し,上記の接合すべき部品間の当接面を溶融させて溶接する。
このとき,部品と電極とが接触する接触面積を十分に確保しなければ,部品間の当接部に十分な電流を供給することができない。そのため,部品と電極とは,強い押圧力により接触させる必要がある。
【0003】
【解決しようとする課題】
ところで,上記溶接すべき部品が,円筒部品の場合は,従来,円筒部品の外周面に電極を押圧して抵抗溶接を実施していた。そのため,上記の抵抗溶接による接合においては,次のような問題がある。
即ち,上記の押圧力が小さいと上記電極と上記円筒部品との間の接触面積を十分に確保することができない。そして,このように接触面積が不十分なまま抵抗溶接を実施すると,接合すべき部品の当接部に十分な電流を流すことができず,接合部において溶接欠陥を生じるおそれが高い。
【0004】
一方,上記押圧力を大きくしていけば,上記円筒部品と上記電極との接触面積を十分に確保して,接合すべき部品の当接部に十分な電流を流すことができる。しかし,上記円筒部品や上記当接部に大電流が流れると,その電流によって発生するジュール熱により円筒部品自体が過熱し,軟化する。そして,軟化した円筒部品にあっては,上記の押圧力により変形を生じ易く,その変形を生じたまま溶接されてしまうおそれがある。
【0005】
【解決しようとする課題】
本発明は,かかる従来の問題点に鑑みてなされたもので,円筒部品の端面を他の被接合部品に抵抗溶接するに当たって,各部品に変形を生じることなく,良好に抵抗溶接できる抵抗溶接機を提供しようとするものである。
【0006】
【課題の解決手段】
本発明は,円筒部品の軸方向の端面を他の被接合部品の平面部に抵抗溶接するための抵抗溶接機であって,
上記円筒部品の内周面を拘束する略円筒形状のインナー部材と,外周面を拘束する略円筒形状のアウター部材とを有しており,
上記インナー部材及び上記アウター部材の両者が,抵抗溶接用の電流を上記円筒部品に供給するための電極をなしており,
かつ,上記インナー部材及び上記アウター部材の両者が,上記円筒部品を,その径方向に押圧する押圧手段を有しており,
該押圧手段からの押圧力によって上記インナー部材と上記アウター部材により上記円筒部品の内外周面を挟持して拘束し,上記円筒部品の軸方向端面に平面部を当接させた上記被接合部品を加圧電極により加圧し,上記インナー部材と上記アウター部材とから上記円筒部材に電流を供給すると共に,上記加圧電極により上記被接合部品に電流を供給して溶接を実施するよう構成されており,
上記インナー部材又は上記アウター部材は,複数のコレット片を略円筒形状に配置してなるコレット部を有しており,
上記押圧手段は,上記コレット部と該コレット部の内周側又は外周側において軸方向に進退可能に配設されたドロー部材とよりなり,該ドロー部材と上記コレット片とは,軸方向に対して傾斜したテーパ面を互いに有していると共に,該テーパ面を摺動可能に当接させており,上記ドロー部材の進退に伴って上記テーパ面の当接位置を変化させることにより,上記コレット片を弾性的に変形させて,上記コレット部の径を大きく又は小さくすることにより上記円筒部品の内周面又は外周面を押圧できるよう構成されており,
かつ,上記ドロー部材は,ネジ部の螺合により進退可能に設けられていることを特徴とする抵抗溶接機にある(請求項1)。
【0007】
本発明による上記抵抗溶接機は,上記円筒部品の内周面を拘束するインナー部材と,外周面を拘束するアウター部材とを有している。また,インナー部材及びアウター部材のうち少なくとも一方は,上記円筒部品を,その径方向に押圧する押圧手段を有している。
【0008】
そのため,上記インナー部材及び上記アウター部材により上記円筒部品の内外周面を拘束した状態で,上記押圧手段により径方向に上記円筒部品を押圧することにより,該円筒部品の内周面及び外周面の両面は,インナー部材及びアウター部材からの強い押圧力又はその反力により,より強く拘束される。そして,上記円筒部品の内周面及び外周面と,インナー部材及びアウター部材との接触面においては,上記押圧手段による押圧力を受けて,十分な接触面積を確保することができる。
【0009】
また,インナー部材及びアウター部材のうち少なくとも一方は,抵抗溶接用の電流を上記円筒部品に供給するための電極をなしている。そのため,上記円筒部品に十分に接触したインナー部材あるいはアウター部材を介して,円筒部品に十分な電流を供給することができる。そして,上記円筒部品と他の被接合部品との当接部に,電流を効率良く流して両者を良好に溶接することができる。
【0010】
さらに,上記のごとく,円筒部品の内周面及び外周面は,インナー部材及びアウター部材により拘束してある。そのため,上記押圧手段からの押圧力は,上記インナー部材と上記アウター部材とによる上記円筒部品に対する狭持力(拘束力)として利用されており,円筒部品を変形させる方向にはほとんど作用しない。それ故,抵抗溶接するに当たって,上記円筒部品がジュール熱により軟化した場合であっても,該円筒部部品に変形を生じるようなことがない。
【0011】
このように,本発明の抵抗溶接機は,上記円筒部品と上記被接合部品との当接部に,効率良く電流を流すことができ,上記円筒部品と上記被接合部品とを良好かつ強固に接合できる。また,このとき,抵抗溶接する上記円筒部品は,その内周面及び外周面の両面から保持してあるため,変形を生じることもない。
【0012】
【発明の実施の形態】
本発明においては,上記インナー部材及び上記アウター部材の両者が,上記電極をなすよう構成されている
この場合には,上記電極と上記円筒部品との接触面積をさらに大きくして,上記電極と上記円筒部品との間の電気的抵抗を低下させることができる。このように電極と円筒部品との間の電気抵抗を抑制された抵抗溶接機は,上記円筒部品と上記被接合部品との当接部に,さらに効率良く電流を流すことができる。そして,このような抵抗溶接機により接合された上記円筒部品と上記被接合部品とは,さらに強固に接合される。
【0013】
また,上記インナー部材及び上記アウター部材の両者が,上記押圧手段を有している。これにより,上記インナー部材及び上記アウター部材は,それぞれが有する押圧手段により上記円筒部品を押圧できる。このとき,インナー部材とアウター部材とは,円筒部品の壁面を狭持した状態で相互に押圧し合うことになる。そのため,上記円筒部品の内外周面を,さらに均等に押圧できる。そして,均等に押圧された上記円筒部品にあっては,抵抗溶接時に生じうる変形をさらに抑制できる。
【0014】
また,上記インナー部材又は上記アウター部材は,複数のコレット片を略円筒形状に配置してなるコレット部を有しており,
上記押圧手段は,上記コレット部と該コレット部の内周側又は外周側において軸方向に進退可能に配設されたドロー部材とよりなり,該ドロー部材と上記コレット片とは,軸方向に対して傾斜したテーパ面を互いに有していると共に,該テーパ面を摺動可能に当接させており,上記ドロー部材の進退に伴って上記テーパ面の当接位置を変化させることにより,上記コレット片を弾性的に変形させて,上記コレット部の径を大きく又は小さくすることにより上記円筒部品の内周面又は外周面を押圧できるよう構成されている
【0015】
この場合には,比較的簡単な装置構成により,上記円筒部品の内周面及び外周面の両面を,均等に押圧できる。すなわち,上記コレット部のコレット片を,上記円筒部品の内周面又は外周面に沿うよう弾性的に変形させることにより,上記円筒部品の内周面又は外周面を拘束することができる。また,上記のコレット片の弾性変形は,上記ドロー部材の進退によって制御することができ,制御方法も比較的容易となる。
【0016】
【実施例】
(実施例1)
本例の実施例にかかる抵抗溶接機1について,図1〜図6を用いて説明する。
本例の抵抗溶接機1は,円筒部品50の端面をシェルポンプ60に抵抗溶接するための抵抗溶接機1である。
該抵抗溶接機1は,図1に示すごとく,円筒部品50の内周面を拘束するインナー部材31と,外周面を拘束するアウター部材32とを有している。そして,インナー部材31及びアウター部材32の両者は,抵抗溶接用の電流を円筒部品50に供給するための電極をなしている。さらに,インナー部材31及びアウター部材32の両者は,円筒部品50を径方向に押圧する押圧手段を有している。以下にこの内容について詳しく説明する。
【0017】
本例の抵抗溶接機1は,図1に示すごとく,自動車用のトルクコンバーターの部品であるポンプインペラを製造するための装置である。このポンプインペラは,円筒部品50とシェルポンプ60とを同軸上に配置し,円筒部品50の軸方向の端面55をシェルポンプ60の平面部65に当接させ,両者を接合して製造する自動車用の部品である。
【0018】
この抵抗溶接機1は,図1に示すごとく,ベース電極20と,該ベース電極20に向けて移動可能に配設された加圧プレート29との間において,上記円筒部品50とシェルポンプ60とを相互に押し付けた状態で保持できるように構成してある。
【0019】
上記加圧プレート29には,シェルポンプ60に当接してこれに電流を供給するための加圧電極291が配設されている。そして,加圧電極291は,加圧プレート29の進退に伴って進退するよう構成されている。
上記ベース電極20には,上記インナー部材31及びアウター部材32が所定の間隔をあけて配設されている。そして,この両者31,32に対してベース電極20から電流が供給されるように構成されている。
【0020】
上記インナー部材31は,図1〜図3に示すごとく,略円筒形状を呈しており,その内周側に配設されたドローバー21(図1)の進退に伴って外径を拡縮するインナーコレット部315を有している。
インナーコレット部315は,図2,図3に示すごとく,その外周面に,円筒部品50の内周面と導電可能に接触するインナー当接部317を有すると共に,その内周面に,ドローバー21のインナーテーパ面213と当接するインナーコレットテーパー316(図1)を有している。コレット片318は,図2,図3に示すごとく,インナー部材31の軸心に沿ったスリット状の切断面381により区切られた細長い短冊状の部位である。そして,このコレット片318は,その基端部382において,略円筒状の本体部分319と弾性的に接続されている。
【0021】
また,上記ドローバー21は,図1に示すごとく,上記ベース電極20のネジ部201に螺合するネジ部211を有する略円柱形状の部材である。そして,このドローバー21は,ネジ部211と軸方向の反対側には,ベース電極20に螺入させるために上記ドローバー21を回動操作するための操作部215を有すると共に,上記インナー部材31のインナーコレットテーパー316と当接するインナーテーパ面213とを有している。
【0022】
そして,上記インナーコレット部315とドローバー21とよりなる本例の第1の押圧手段は,図1に示すごとく,ドローバー21を回動させて下方に降下(前進)させることにより,インナーテーパ面213とインナーコレットテーパー316とが摺動して互いの当接位置がずれ,上記インナー部材31のインナーコレット部315の外径が拡張し,上記円筒部品50を内周側から径方向に押圧するように構成されている。
【0023】
上記アウター部材32は,略円筒形状を呈しており,その外周側に配設されたドローリング22の進退に伴って内径を縮径するアウターコレット部325を有している。アウターコレット部325は,図4及び図5に示すごとく,その内周面に,円筒部品50の外周面と当接するアウター当接部327を有していると共に,その外周面に,後述するドローリング22のアウターテーパ面323と当接するアウターコレットテーパー326を有している。
【0024】
コレット片328は,上記インナーコレット部315のコレット片318と同様に,その基端部392により,アウター部材32の本体部分329と弾性的に接続されている。
また,上記ドローリング22は,図1に示すごとく,上記アウター部材32の外周面に配設されたネジ部321に螺合するネジ部321を有する略円筒形状の部材である。そして,このドローリング22は,その外周面には,該ドローリング22を回転させるスパナ等の工具を係合させるための対向する2平面が配設されていると共に,上記アウター部材32のアウターコレットテーパー326と当接するアウターテーパ面223とを有している。
【0025】
そして,上記アウターコレット部325とドローリング22とよりなる本例の第2の押圧手段は,図1に示すごとく,ドローリング22を回動させて下方に降下(前進)させることにより,アウターテーパ面223とアウターコレットテーパ−326とが摺動して互いの当接位置がずれ,上記アウター部材32のアウターコレット部325の内径が縮小し,上記円筒部品50を外周側から径方向に押圧するよう構成されている。
【0026】
上記のごとく構成された抵抗溶接機1を用いて,上記シェルポンプ60に上記円筒部品50を接合して,ポンプインペラを製造するに当たっては,まず,図6に示すごとく,インナー部材31とアウター部材32との間の間隙の底部に配置した絶縁部材40の上に円筒部品50を挿入配置する。
【0027】
次に,このドローバー21及びドローリング22を,交互かつ均等に回転させて,それぞれベース電極20及びアウター部材32に対して螺入していく。ドローバー21を螺入していくと,そのインナーテーパ面213は,インナー部材31のインナーコレットテーパ−316と当接し,コレット片318を外径方向に変位させる。そして,インナーコレット部315の外径を大きくして,インナー当接部317を円筒部品50の内周面に押圧させることができる。
【0028】
また,ドローリング22を螺入していくと,そのアウターテーパ−面223は,アウター部材32のアウターコレットテーパ−326と当接して,コレット片328を内径方向に変位させ,アウターコレット部325の内径を小さくする。このようにして,アウター当接部327を円筒部品50の外周面に押圧させることができる。
【0029】
そしてその後,円筒部品50の内周面とインナー当接部317との間及び円筒部品50の外周面とアウター部材32との間に所定の押圧力を生じるまで,ドローバー21とドローリング22とを交互に螺入する。
そうすると,インナー当接部317及びアウター当接部327と,円筒部品50の内周面及び外周面との間に均等に押圧力を発生させ,その接触面において,十分な接触面積を確保することができる。
【0030】
次に,図1に示すごとく,円筒部品50に対してシェルポンプ60を同軸上に配置し,円筒部品50の端面とシェルポンプ60とを当接させる。ここで,インナー部材31とシェルポンプ60との間の電気的なリークを防止するため,両者の間に絶縁部材40を配設しておく。そして,シェルポンプ60を加圧プレート29と共に前進(下降)させた加圧電極291により押さえる。そして,シェルポンプ60と円筒部品50との間に所定の押し付け荷重が発生するよう,ベース電極20と加圧プレート29との間隔を調整する。
【0031】
次に,上記のごとく円筒部品50とシェルポンプ60とを保持する抵抗溶接機1において,加圧プレート29とベース電極20との間に電圧を印加し,両者の間に電流を流す。このようにして,円筒部品50とシェルポンプ60とが当接する当接部において,上記の電流によるジュール熱を発生させる。そして,このジュール熱により,円筒部品50とシェルポンプ60との当接部において,その素材を溶融させて両者を溶接する。
【0032】
このとき,円筒部品50の内外周面は,上記アウター部材32と上記インナー部材31とにより狭持され,拘束された状態にあり,かつ,上記第1,第2の押圧手段からの押圧力によりその狭持力(拘束力)が増大している。押圧する。そのため,電極であるアウター部材32及びインナー部材31と,円筒部品50とは十分に接触した状態にある。
【0033】
このようにアウター部材32及びインナー部材31と円筒部品50とを十分に接触させた状態で,電流を供給することにより,円筒部品50とシェルポンプ60の当接部に効率良く電流を流すことができる。そして,その当接部を溶融させて,両者を良好に溶接できる。
【0034】
また,円筒部品50の内外周面を,インナー部材31とアウター部材32とにより狭持し,拘束しながら溶接を実施する。そして,上記のごとく,その狭持力(拘束力)は,上記第1,第2の押圧手段からの押圧力によって増大している。また,この拘束力は,円筒部品50を変形する方向にはほとんど作用していない。そのため,ジュール熱により円筒部品50が軟化した場合にも,円筒部品50に変形を生じるおそれがない。
【0035】
このように,本例の抵抗溶接機1によれば,円筒部品50の端面をシェルポンプ60に抵抗溶接するに当たって,円筒部品50に変形を生じることなく,強固かつ良好に抵抗溶接することができる。
なお,本例の抵抗溶接機1においては,インナー部材31とアウター部材32とから円筒部品50に電流を供給したが,どちらか一方からのみ電流を供給する構成とすることも可能である。
【0036】
また,本例の抵抗溶接機1においては,上記ドローバー21及び上記ドローリング22は,ネジ部211,221の螺合により進退するよう構成されている。これに代えて,ドローバー21及びドローリング22を,それぞれ油圧シリンダに接続して,各油圧シリンダの動きによりドローバー21及びドローリング22を進退させるように構成することもできる。
【0037】
さらに,ドローバー21とドローリング22とを一体的に,単一の油圧シリンダに接続して,この油圧シリンダの動きによりドローバー21及びドローリング22を一体的に進退できるよう構成することもできる。この場合には,ドローバー21及びドローリング22を一体的に進退させて,上記円筒部品の内周面及び外周面をさらに均等に押圧することができる。
【0038】
(実施例2)
本例は,実施例1における上記抵抗溶接機1において,上記円筒部品50の内周面を拘束する方法を変更した例である。
本例の抵抗溶接機1では,図7に示すごとく,実施例1における上記インナーコレット部を有する上記インナー部材及び上記ドローバーの組み合わせに代えて,一定の外径であるインナー当接部317を有するインナー部材31を適用している。
【0039】
このインナー当接部317は,円筒部品50の内周面に対して,ほとんど隙間なく嵌合可能なように構成してある。なお,実際には,インナー部材31の外周に上記円筒部品50を装着する際には,両者の間には最低限のクリアランスが必要となるが,このクリアランスは円筒部品50の内径公差の範囲内に収めることが必要である。
【0040】
本例の抵抗溶接機1によれば,上記のインナー当接部317によって円筒部品50の内周面を拘束している。そのため,アウター部材32により円筒部品50の外周面を押圧することにより,インナー当接部317には,その反力を生じさせることができる。それ故,インナー部材31及びアウター部材32と,円筒部品50との間に,適切な押圧力を発生させて両者を十分に接触させることができる。
【0041】
そして,インナー部材31及びアウター部材32を,円筒部品50に十分接触させた状態で,抵抗溶接を実施することにより,円筒部品50とシェルポンプ60とを良好に溶接することができる。また,円筒部品50は,内周面と外周面との両面から拘束した状態で,抵抗溶接される。そのため,円筒部品50に変形等を生じることもない。
なお,その他の構成及び作用効果については,実施例1と同様である。
【0042】
(実施例3)
本例は,実施例1における上記抵抗溶接機1において,上記円筒部品50の外周面の保持する方法を変更した例である。
本例の抵抗溶接機1では,図8に示すごとく,実施例1における上記アウターコレット部を有する上記アウター部材及び上記ドローリングの組み合わせに代えて,一定の内径であるアウター当接部327を有するアウター部材32を適用している。
このアウター当接部327は,円筒部品50の外周面に対して,ほとんど隙間なく嵌合可能なように構成してある。なお,実際には,アウター部材32の内周に上記円筒部品50を装着する際には,両者の間には最低限のクリアランスが必要となるが,このクリアランスは円筒部品50の内径公差の範囲内に収めることが必要である。
【0043】
本例の抵抗溶接機1によれば,上記のアウター当接部327によって円筒部品50の外周面を拘束している。そのため,インナー部材31により円筒部品50の内周面を押圧することにより,アウター当接部327には,その反力を生じさせることができる。それ故,インナー部材31及びアウター部材32と,円筒部品50との間に,適切な押圧力を発生させて両者を十分に接触させることができる。
【0044】
そして,インナー部材31及びアウター部材32を,円筒部品50に十分接触させた状態で,抵抗溶接を実施することにより,円筒部品50とシェルポンプ60とを良好に溶接することができる。また,円筒部品50は,内周面と外周面との両面から拘束した状態で,抵抗溶接を実施する。そのため,円筒部品50に変形等を生じるおそれがない。
なお,その他の構成及び作用効果については,実施例1と同様である。
【図面の簡単な説明】
【図1】実施例1における,抵抗溶接機を示す断面図。
【図2】実施例1における,インナー部材のインナーコレット部を示す正面図。
【図3】実施例1における,インナー部材のインナーコレット部を示す断面図。
【図4】実施例1における,アウター部材のアウターコレット部を示す正面図。
【図5】実施例1における,アウター部材のアウターコレット部を示す断面図。
【図6】実施例1における,抵抗溶接機を示す説明図。
【図7】実施例2における,抵抗溶接機を示す断面図。
【図8】実施例3における,抵抗溶接機を示す断面図。
【符号の説明】
1...抵抗溶接機,
20...ベース電極,
21...ドローバー,
213...インナーテーパ面,
22...ドローリング,
223...アウターテーパー面,
29...加圧プレート,
291...加圧電極,
31...インナー部材,
315...インナーコレット部,
316...インナーコレットテーパー,
317...インナー当接部,
32...アウター部材,
325...アウターコレット部,
326...アウターコレットテーパー,
327...アウター当接部,
40...絶縁部材,
50...円筒部品,
60...シェルポンプ,
[0001]
【Technical field】
The present invention relates to a resistance welder that resistance welds an end face of a cylindrical part to another member.
[0002]
[Prior art]
In carrying out resistance welding, the parts to be joined are brought into contact with each other and the electrodes are brought into contact with the parts. An electric current is passed between these electrodes, and the contact surfaces between the parts to be joined are melted and welded.
At this time, a sufficient current cannot be supplied to the contact portion between the components unless a sufficient contact area between the component and the electrode is secured. For this reason, the parts and the electrodes need to be brought into contact with each other with a strong pressing force.
[0003]
[Problems to be solved]
When the part to be welded is a cylindrical part, conventionally, resistance welding is performed by pressing an electrode on the outer peripheral surface of the cylindrical part. Therefore, there are the following problems in the joining by the above resistance welding.
That is, when the pressing force is small, a sufficient contact area between the electrode and the cylindrical part cannot be secured. If resistance welding is performed with the contact area being insufficient in this way, a sufficient current cannot be supplied to the contact portion of the parts to be joined, and there is a high risk of causing a welding defect in the joint portion.
[0004]
On the other hand, if the pressing force is increased, a sufficient contact area between the cylindrical part and the electrode can be secured, and a sufficient current can be supplied to the contact part of the part to be joined. However, when a large current flows through the cylindrical part or the contact portion, the cylindrical part itself is overheated and softened by Joule heat generated by the current. The softened cylindrical part is likely to be deformed by the above-mentioned pressing force, and may be welded with the deformation.
[0005]
[Problems to be solved]
The present invention has been made in view of such a conventional problem, and in resistance welding the end face of a cylindrical part to other parts to be joined, the resistance welding machine can perform good resistance welding without causing deformation of each part. Is to provide.
[0006]
[Means for solving problems]
The present invention is a resistance welding machine for resistance welding the end face in the axial direction of a cylindrical part to the flat part of another part to be joined,
A substantially cylindrical inner member that restrains the inner peripheral surface of the cylindrical part, and a substantially cylindrical outer member that restrains the outer peripheral surface;
Both the inner member and the outer member form an electrode for supplying a current for resistance welding to the cylindrical part,
And both the said inner member and the said outer member have a pressing means which presses the said cylindrical component to the radial direction,
The to-be-joined component in which the inner and outer peripheral surfaces of the cylindrical part are clamped and restrained by the inner member and the outer member by the pressing force from the pressing means, and the flat part is brought into contact with the axial end surface of the cylindrical part. pressurized by the pressure electrode, supplies a current to the cylindrical member from the said inner member and the outer member being configured to carry out welding by supplying a current to the object to be joined parts by the pressure electrode ,
The inner member or the outer member has a collet portion formed by arranging a plurality of collet pieces in a substantially cylindrical shape,
The pressing means includes the collet portion and a draw member disposed on the inner peripheral side or the outer peripheral side of the collet portion so as to be movable back and forth in the axial direction. The draw member and the collet piece are And the tapered surfaces are slidably contacted with each other, and the contact position of the tapered surface is changed as the draw member advances and retreats. It is configured to be able to press the inner peripheral surface or outer peripheral surface of the cylindrical part by elastically deforming the piece and increasing or decreasing the diameter of the collet part.
In addition, the draw member is provided in a resistance welding machine, wherein the draw member is provided so as to be advanced and retracted by screwing of a screw portion .
[0007]
The resistance welding machine according to the present invention includes an inner member that restrains the inner peripheral surface of the cylindrical part and an outer member that restrains the outer peripheral surface. At least one of the inner member and the outer member has a pressing means for pressing the cylindrical part in the radial direction.
[0008]
Therefore, by pressing the cylindrical part in the radial direction by the pressing means in a state where the inner and outer peripheral surfaces of the cylindrical part are constrained by the inner member and the outer member, the inner peripheral surface and the outer peripheral surface of the cylindrical part are pressed. Both surfaces are more strongly restrained by a strong pressing force or reaction force from the inner member and the outer member. A sufficient contact area can be secured on the contact surfaces of the inner and outer peripheral surfaces of the cylindrical part and the contact surfaces of the inner member and the outer member by receiving a pressing force by the pressing means.
[0009]
At least one of the inner member and the outer member forms an electrode for supplying a current for resistance welding to the cylindrical part. Therefore, a sufficient current can be supplied to the cylindrical part through the inner member or the outer member that is in sufficient contact with the cylindrical part. The current can be efficiently passed through the contact portion between the cylindrical part and the other part to be welded, and both can be welded well.
[0010]
Further, as described above, the inner peripheral surface and the outer peripheral surface of the cylindrical part are constrained by the inner member and the outer member. Therefore, the pressing force from the pressing means is used as a holding force (binding force) for the cylindrical part by the inner member and the outer member, and hardly acts in the direction of deforming the cylindrical part. Therefore, even when the cylindrical part is softened by Joule heat in resistance welding, the cylindrical part part is not deformed.
[0011]
As described above, the resistance welding machine of the present invention can efficiently flow a current to the contact portion between the cylindrical part and the part to be joined, and the cylindrical part and the part to be joined can be made good and strong. Can be joined. At this time, the cylindrical part to be resistance-welded is held from both the inner peripheral surface and the outer peripheral surface, so that deformation does not occur.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, both the inner member and the outer member are configured to form the electrode .
In this case, the contact area between the electrode and the cylindrical part can be further increased, and the electrical resistance between the electrode and the cylindrical part can be reduced. In this manner, the resistance welding machine in which the electrical resistance between the electrode and the cylindrical part is suppressed can flow current more efficiently to the contact portion between the cylindrical part and the part to be joined. And the said cylindrical component and the said to-be-joined components joined by such a resistance welding machine are joined still more firmly.
[0013]
Further, both the inner member and the outer member have the pressing means . Thereby , the said inner member and the said outer member can press the said cylindrical component with the press means which each has. At this time, the inner member and the outer member are pressed against each other while holding the wall surface of the cylindrical part. Therefore, the inner and outer peripheral surfaces of the cylindrical part can be pressed evenly. And in the said cylindrical part pressed uniformly, the deformation | transformation which may arise at the time of resistance welding can further be suppressed.
[0014]
Further, the inner member or the outer member has a collet portion formed by arranging a plurality of collet pieces in a substantially cylindrical shape,
The pressing means includes the collet portion and a draw member disposed on the inner peripheral side or the outer peripheral side of the collet portion so as to be movable back and forth in the axial direction. The draw member and the collet piece are And the tapered surfaces are slidably contacted with each other, and the contact position of the tapered surface is changed as the draw member advances and retreats. The piece is elastically deformed to increase or decrease the diameter of the collet portion so that the inner peripheral surface or the outer peripheral surface of the cylindrical part can be pressed .
[0015]
In this case, both the inner peripheral surface and the outer peripheral surface of the cylindrical part can be evenly pressed with a relatively simple device configuration. That is, the inner peripheral surface or the outer peripheral surface of the cylindrical part can be constrained by elastically deforming the collet piece of the collet portion along the inner peripheral surface or the outer peripheral surface of the cylindrical part. Further, the elastic deformation of the collet piece can be controlled by the advance and retreat of the draw member, and the control method becomes relatively easy.
[0016]
【Example】
Example 1
A resistance welding machine 1 according to an embodiment of the present example will be described with reference to FIGS.
The resistance welder 1 of this example is a resistance welder 1 for resistance-welding the end surface of the cylindrical part 50 to the shell pump 60.
As shown in FIG. 1, the resistance welder 1 includes an inner member 31 that restrains the inner peripheral surface of the cylindrical part 50 and an outer member 32 that restrains the outer peripheral surface. Both the inner member 31 and the outer member 32 form electrodes for supplying a current for resistance welding to the cylindrical component 50. Furthermore, both the inner member 31 and the outer member 32 have pressing means for pressing the cylindrical component 50 in the radial direction. This will be described in detail below.
[0017]
As shown in FIG. 1, the resistance welding machine 1 of this example is an apparatus for manufacturing a pump impeller that is a part of a torque converter for automobiles. This pump impeller is manufactured by arranging a cylindrical part 50 and a shell pump 60 on the same axis, contacting an end face 55 in the axial direction of the cylindrical part 50 with a flat portion 65 of the shell pump 60, and joining them together. It is a part for.
[0018]
As shown in FIG. 1, the resistance welder 1 includes a cylindrical part 50, a shell pump 60, and the like between a base electrode 20 and a pressure plate 29 movably disposed toward the base electrode 20. Can be held in a state where they are pressed against each other.
[0019]
The pressurizing plate 29 is provided with a pressurizing electrode 291 for contacting the shell pump 60 and supplying current thereto. The pressurization electrode 291 is configured to advance and retract as the pressurization plate 29 advances and retreats.
The base electrode 20 is provided with the inner member 31 and the outer member 32 at a predetermined interval. A current is supplied from the base electrode 20 to both 31 and 32.
[0020]
As shown in FIGS. 1 to 3, the inner member 31 has a substantially cylindrical shape, and an inner collet that expands and contracts the outer diameter as the draw bar 21 (FIG. 1) disposed on the inner peripheral side thereof advances and retreats. Part 315.
As shown in FIGS. 2 and 3, the inner collet portion 315 has an inner contact portion 317 in conductive contact with the inner peripheral surface of the cylindrical component 50 on its outer peripheral surface, and the draw bar 21 on its inner peripheral surface. The inner collet taper 316 (FIG. 1) is in contact with the inner taper surface 213. As shown in FIGS. 2 and 3, the collet piece 318 is an elongate strip-shaped portion delimited by a slit-shaped cut surface 381 along the axis of the inner member 31. The collet piece 318 is elastically connected to the substantially cylindrical main body portion 319 at the base end 382.
[0021]
Further, the draw bar 21 is a substantially cylindrical member having a screw portion 211 that is screwed into the screw portion 201 of the base electrode 20 as shown in FIG. The draw bar 21 has an operating portion 215 for rotating the draw bar 21 to be screwed into the base electrode 20 on the opposite side of the screw portion 211 in the axial direction, and the inner member 31 The inner collet taper 316 and the inner taper surface 213 which contact | abuts are provided.
[0022]
As shown in FIG. 1, the first pressing means of the present example comprising the inner collet portion 315 and the draw bar 21 rotates the draw bar 21 to lower (advance) downward, thereby causing the inner tapered surface 213 to move downward. And the inner collet taper 316 slide so that the abutting positions are shifted, the outer diameter of the inner collet portion 315 of the inner member 31 is expanded, and the cylindrical part 50 is pressed in the radial direction from the inner peripheral side. It is configured.
[0023]
The outer member 32 has a substantially cylindrical shape and has an outer collet portion 325 whose inner diameter is reduced as the draw ring 22 disposed on the outer peripheral side thereof advances and retreats. As shown in FIGS. 4 and 5, the outer collet portion 325 has an outer contact portion 327 that contacts the outer peripheral surface of the cylindrical part 50 on the inner peripheral surface thereof, and the outer collet portion 325 has a doppler described later on the outer peripheral surface. An outer collet taper 326 that contacts the outer tapered surface 323 of the rolling 22 is provided.
[0024]
The collet piece 328 is elastically connected to the main body portion 329 of the outer member 32 by the base end portion 392 in the same manner as the collet piece 318 of the inner collet portion 315.
Further, as shown in FIG. 1, the draw ring 22 is a substantially cylindrical member having a screw portion 321 that is screwed into a screw portion 321 disposed on the outer peripheral surface of the outer member 32. The draw ring 22 is provided on its outer peripheral surface with two opposing flat surfaces for engaging a tool such as a spanner for rotating the draw ring 22, and the outer collet of the outer member 32. An outer tapered surface 223 that contacts the taper 326 is provided.
[0025]
As shown in FIG. 1, the second pressing means of this example comprising the outer collet portion 325 and the draw ring 22 rotates the draw ring 22 and lowers (advances) downward to move the outer taper. The surface 223 and the outer collet taper-326 are slid and the abutting positions are shifted, the inner diameter of the outer collet portion 325 of the outer member 32 is reduced, and the cylindrical part 50 is pressed in the radial direction from the outer peripheral side. It is configured as follows.
[0026]
In manufacturing the pump impeller by joining the cylindrical part 50 to the shell pump 60 using the resistance welding machine 1 configured as described above, first, as shown in FIG. 6, the inner member 31 and the outer member The cylindrical component 50 is inserted and disposed on the insulating member 40 disposed at the bottom of the gap between the first and second members.
[0027]
Next, the draw bar 21 and the draw ring 22 are alternately and evenly rotated and screwed into the base electrode 20 and the outer member 32, respectively. As the draw bar 21 is screwed in, the inner tapered surface 213 comes into contact with the inner collet taper-316 of the inner member 31 and displaces the collet piece 318 in the outer diameter direction. Then, the outer diameter of the inner collet portion 315 can be increased and the inner contact portion 317 can be pressed against the inner peripheral surface of the cylindrical component 50.
[0028]
As the draw ring 22 is screwed in, the outer taper surface 223 comes into contact with the outer collet taper-326 of the outer member 32, displaces the collet piece 328 in the inner diameter direction, and the outer collet portion 325. Reduce the inner diameter. In this way, the outer contact portion 327 can be pressed against the outer peripheral surface of the cylindrical component 50.
[0029]
Then, until the predetermined pressing force is generated between the inner peripheral surface of the cylindrical part 50 and the inner contact portion 317 and between the outer peripheral surface of the cylindrical part 50 and the outer member 32, the draw bar 21 and the draw ring 22 are moved. Alternately screw in.
Then, a pressing force is evenly generated between the inner contact portion 317 and the outer contact portion 327 and the inner peripheral surface and the outer peripheral surface of the cylindrical part 50, and a sufficient contact area is secured on the contact surface. Can do.
[0030]
Next, as shown in FIG. 1, the shell pump 60 is coaxially disposed with respect to the cylindrical part 50, and the end surface of the cylindrical part 50 and the shell pump 60 are brought into contact with each other. Here, in order to prevent electrical leakage between the inner member 31 and the shell pump 60, the insulating member 40 is disposed between them. Then, the shell pump 60 is pressed by the pressurizing electrode 291 that is advanced (lowered) together with the pressurizing plate 29. Then, the distance between the base electrode 20 and the pressure plate 29 is adjusted so that a predetermined pressing load is generated between the shell pump 60 and the cylindrical part 50.
[0031]
Next, in the resistance welding machine 1 that holds the cylindrical part 50 and the shell pump 60 as described above, a voltage is applied between the pressure plate 29 and the base electrode 20, and a current flows between them. In this way, Joule heat is generated by the current at the contact portion where the cylindrical part 50 and the shell pump 60 are in contact. The Joule heat melts the material at the contact portion between the cylindrical part 50 and the shell pump 60 and welds them together.
[0032]
At this time, the inner and outer peripheral surfaces of the cylindrical part 50 are held and restrained by the outer member 32 and the inner member 31 and are pressed by the pressing force from the first and second pressing means. The pinching force (restraint force) is increasing. Press. Therefore, the outer member 32 and the inner member 31 that are electrodes and the cylindrical part 50 are in sufficient contact.
[0033]
In this way, by supplying a current in a state where the outer member 32 and the inner member 31 are sufficiently in contact with the cylindrical part 50, the current can be efficiently supplied to the contact part between the cylindrical part 50 and the shell pump 60. it can. And the contact part can be melted and both can be welded well.
[0034]
Further, the inner and outer peripheral surfaces of the cylindrical part 50 are held between the inner member 31 and the outer member 32, and welding is performed while restraining. As described above, the holding force (binding force) is increased by the pressing force from the first and second pressing means. Further, this restraining force hardly acts in the direction in which the cylindrical part 50 is deformed. Therefore, even when the cylindrical part 50 is softened by Joule heat, there is no possibility that the cylindrical part 50 is deformed.
[0035]
Thus, according to the resistance welding machine 1 of this example, when the end face of the cylindrical part 50 is resistance-welded to the shell pump 60, the cylindrical part 50 can be strongly and well resistance-welded without causing deformation. .
In the resistance welding machine 1 of this example, the current is supplied from the inner member 31 and the outer member 32 to the cylindrical part 50, but it is also possible to adopt a configuration in which current is supplied only from either one.
[0036]
Further, in the resistance welding machine 1 of this example, the draw bar 21 and the draw ring 22 are configured to advance and retract by screwing of the screw portions 211 and 221. Alternatively, the draw bar 21 and the draw ring 22 may be connected to hydraulic cylinders, respectively, and the draw bar 21 and the draw ring 22 may be advanced and retracted by the movement of each hydraulic cylinder.
[0037]
Further, the draw bar 21 and the draw ring 22 can be integrally connected to a single hydraulic cylinder, and the draw bar 21 and the draw ring 22 can be integrally advanced and retracted by the movement of the hydraulic cylinder. In this case, the draw bar 21 and the draw ring 22 can be integrally moved forward and backward to press the inner peripheral surface and the outer peripheral surface of the cylindrical part more evenly.
[0038]
(Example 2)
This example is an example in which the method of restraining the inner peripheral surface of the cylindrical part 50 is changed in the resistance welding machine 1 in the first embodiment.
As shown in FIG. 7, the resistance welding machine 1 of this example has an inner contact portion 317 having a constant outer diameter instead of the combination of the inner member having the inner collet portion and the draw bar in the first embodiment. The inner member 31 is applied.
[0039]
The inner contact portion 317 is configured to be fitted to the inner peripheral surface of the cylindrical component 50 with almost no gap. Actually, when the cylindrical part 50 is mounted on the outer periphery of the inner member 31, a minimum clearance is required between the two, but this clearance is within the range of the inner diameter tolerance of the cylindrical part 50. It is necessary to fit in.
[0040]
According to the resistance welding machine 1 of this example, the inner peripheral surface of the cylindrical component 50 is constrained by the inner contact portion 317 described above. Therefore, by pressing the outer peripheral surface of the cylindrical component 50 by the outer member 32, the reaction force can be generated in the inner contact portion 317. Therefore, an appropriate pressing force can be generated between the inner member 31 and the outer member 32 and the cylindrical part 50 to sufficiently bring them into contact with each other.
[0041]
Then, by performing resistance welding with the inner member 31 and the outer member 32 sufficiently in contact with the cylindrical part 50, the cylindrical part 50 and the shell pump 60 can be favorably welded. The cylindrical part 50 is resistance-welded in a state where it is restrained from both the inner peripheral surface and the outer peripheral surface. Therefore, the cylindrical part 50 is not deformed.
Other configurations and operational effects are the same as those in the first embodiment.
[0042]
(Example 3)
This example is an example in which the method of holding the outer peripheral surface of the cylindrical part 50 is changed in the resistance welding machine 1 in the first embodiment.
As shown in FIG. 8, the resistance welding machine 1 of this example has an outer contact part 327 having a constant inner diameter instead of the combination of the outer member having the outer collet part and the drawing ring in Example 1. The outer member 32 is applied.
The outer contact portion 327 is configured to be fitted to the outer peripheral surface of the cylindrical part 50 with almost no gap. Actually, when the cylindrical part 50 is mounted on the inner periphery of the outer member 32, a minimum clearance is required between the two, but this clearance is within the range of the inner diameter tolerance of the cylindrical part 50. It is necessary to fit in.
[0043]
According to the resistance welding machine 1 of this example, the outer peripheral surface of the cylindrical component 50 is constrained by the outer contact portion 327 described above. Therefore, by pressing the inner peripheral surface of the cylindrical component 50 with the inner member 31, the reaction force can be generated in the outer contact portion 327. Therefore, an appropriate pressing force can be generated between the inner member 31 and the outer member 32 and the cylindrical part 50 to sufficiently bring them into contact with each other.
[0044]
Then, by performing resistance welding with the inner member 31 and the outer member 32 sufficiently in contact with the cylindrical part 50, the cylindrical part 50 and the shell pump 60 can be favorably welded. In addition, the cylindrical part 50 is subjected to resistance welding in a state where it is restrained from both the inner peripheral surface and the outer peripheral surface. Therefore, there is no possibility that the cylindrical part 50 is deformed.
Other configurations and operational effects are the same as those in the first embodiment.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a resistance welder in Embodiment 1. FIG.
FIG. 2 is a front view showing an inner collet portion of the inner member in the first embodiment.
3 is a cross-sectional view showing an inner collet portion of the inner member in Embodiment 1. FIG.
4 is a front view showing an outer collet portion of an outer member in Embodiment 1. FIG.
5 is a cross-sectional view showing an outer collet portion of an outer member in Embodiment 1. FIG.
6 is an explanatory view showing a resistance welder in Embodiment 1. FIG.
7 is a sectional view showing a resistance welder in Embodiment 2. FIG.
8 is a cross-sectional view showing a resistance welder in Example 3. FIG.
[Explanation of symbols]
1. . . Resistance welding machine,
20. . . Base electrode,
21. . . Drawbar,
213. . . Inner taper surface,
22. . . Drawing,
223. . . Outer taper surface,
29. . . Pressure plate,
291. . . Pressure electrode,
31. . . Inner member,
315. . . Inner collet,
316. . . Inner collet taper,
317. . . Inner contact part,
32. . . Outer member,
325. . . Outer collet,
326. . . Outer collet taper,
327. . . Outer contact part,
40. . . Insulation member,
50. . . Cylindrical parts,
60. . . Shell pump,

Claims (1)

円筒部品の軸方向の端面を他の被接合部品の平面部に抵抗溶接するための抵抗溶接機であって,
上記円筒部品の内周面を拘束する略円筒形状のインナー部材と,外周面を拘束する略円筒形状のアウター部材とを有しており,
上記インナー部材及び上記アウター部材の両者が,抵抗溶接用の電流を上記円筒部品に供給するための電極をなしており,
かつ,上記インナー部材及び上記アウター部材の両者が,上記円筒部品を,その径方向に押圧する押圧手段を有しており,
該押圧手段からの押圧力によって上記インナー部材と上記アウター部材により上記円筒部品の内外周面を挟持して拘束し,上記円筒部品の軸方向端面に平面部を当接させた上記被接合部品を加圧電極により加圧し,上記インナー部材と上記アウター部材とから上記円筒部材に電流を供給すると共に,上記加圧電極により上記被接合部品に電流を供給して溶接を実施するよう構成されており,
上記インナー部材又は上記アウター部材は,複数のコレット片を略円筒形状に配置してなるコレット部を有しており,
上記押圧手段は,上記コレット部と該コレット部の内周側又は外周側において軸方向に進退可能に配設されたドロー部材とよりなり,該ドロー部材と上記コレット片とは,軸方向に対して傾斜したテーパ面を互いに有していると共に,該テーパ面を摺動可能に当接させており,上記ドロー部材の進退に伴って上記テーパ面の当接位置を変化させることにより,上記コレット片を弾性的に変形させて,上記コレット部の径を大きく又は小さくすることにより上記円筒部品の内周面又は外周面を押圧できるよう構成されており,
かつ,上記ドロー部材は,ネジ部の螺合により進退可能に設けられていることを特徴とする抵抗溶接機。
A resistance welding machine for resistance-welding the axial end face of a cylindrical part to a flat part of another part to be joined,
A substantially cylindrical inner member that restrains the inner peripheral surface of the cylindrical part, and a substantially cylindrical outer member that restrains the outer peripheral surface;
Both the inner member and the outer member form an electrode for supplying a current for resistance welding to the cylindrical part,
And both the said inner member and the said outer member have a pressing means which presses the said cylindrical component to the radial direction,
The to-be-joined component in which the inner and outer peripheral surfaces of the cylindrical part are clamped and restrained by the inner member and the outer member by the pressing force from the pressing means, and the flat part is brought into contact with the axial end surface of the cylindrical part. pressurized by the pressure electrode, supplies a current to the cylindrical member from the said inner member and the outer member being configured to carry out welding by supplying a current to the object to be joined parts by the pressure electrode ,
The inner member or the outer member has a collet portion formed by arranging a plurality of collet pieces in a substantially cylindrical shape,
The pressing means includes the collet portion and a draw member disposed on the inner peripheral side or the outer peripheral side of the collet portion so as to be movable back and forth in the axial direction. The draw member and the collet piece are And the tapered surfaces are slidably contacted with each other, and the contact position of the tapered surface is changed as the draw member advances and retreats. It is configured to be able to press the inner peripheral surface or outer peripheral surface of the cylindrical part by elastically deforming the piece and increasing or decreasing the diameter of the collet part.
And the said draw member is provided so that advancement / retraction is possible by screwing of a screw part, The resistance welding machine characterized by the above-mentioned .
JP2002173110A 2002-06-13 2002-06-13 Resistance welding machine Expired - Fee Related JP4284928B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8650730B2 (en) 2009-02-23 2014-02-18 Btm Corporation Clinching tool

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5185409B2 (en) * 2011-03-30 2013-04-17 日本碍子株式会社 Resistance welding method and resistance welding jig
CN105290583A (en) * 2014-07-31 2016-02-03 张建生 Water-cooled electrode clamp
DE102016212469A1 (en) * 2016-07-08 2018-01-11 Robert Bosch Gmbh Method for producing a high-pressure fuel pump
JP6504134B2 (en) * 2016-08-26 2019-04-24 マツダ株式会社 Apparatus and method for joining metal members

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8650730B2 (en) 2009-02-23 2014-02-18 Btm Corporation Clinching tool

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