JP2017074616A - Electric resistance-welding electrode - Google Patents

Electric resistance-welding electrode Download PDF

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JP2017074616A
JP2017074616A JP2015217080A JP2015217080A JP2017074616A JP 2017074616 A JP2017074616 A JP 2017074616A JP 2015217080 A JP2015217080 A JP 2015217080A JP 2015217080 A JP2015217080 A JP 2015217080A JP 2017074616 A JP2017074616 A JP 2017074616A
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sliding member
insertion hole
hole
shaft portion
end surface
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青山　好高
Yoshitaka Aoyama
好高 青山
青山　省司
Shoji Aoyama
省司 青山
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Abstract

PROBLEM TO BE SOLVED: To provide an electric resistance-welding electrode for stabilizing support of a projection bolt in an electrode, and further simplifying a shape of a sliding member, by relieving a thermal condition to a sliding member made of an insulation material.SOLUTION: An electrode body 5 is formed with an insertion hole 12 of a bolt 1 and a guide hole 14 of a sliding member 13. The sliding member 13 is formed in a cylindrical shape, an air passage 18 is provided on its outer peripheral surface, a support hole 17 for inserting a shaft part 3 of the bolt 1 into a metallic support member 16 fitted in the sliding member 13 is formed in a coaxial state with the insertion hole 12, an end surface 19 of the sliding member 13 is formed in a place projecting more than an end surface 20 of the support member 16, and the end surface 19 of the sliding member 13 and an inner end surface 21 of the guide hole 14 are brought into close contact or separated, and are constituted so as to intermit cooling air, and an insulation material 29 is integrated into the insertion hole 12 or an insulation cavity 30 is provided.SELECTED DRAWING: Figure 1

Description

この発明は、円形のフランジと、フランジと同軸状態で形成された軸部と、フランジの軸部側の密着面に形成された溶着用突起によって構成されているプロジェクションボルトを溶接の対象とした電気抵抗溶接用電極に関している。  The present invention relates to an electric power for welding a circular flange, a shaft portion formed coaxially with the flange, and a projection bolt formed by a welding projection formed on a contact surface on the shaft portion side of the flange. The present invention relates to an electrode for resistance welding.

特公平０７−０６７６２４号公報、特許第２９０３１４９号公報および特開２０１５−０５１４５７号公報には、円形のフランジと、フランジと同軸状態で形成された雄ねじ部と、フランジの雄ねじ部側の密着面に形成された溶着用突起によって構成されたプロジェクションボルトを、鋼板部品の下孔から突き出ている中空のガイドピンに差し込んで鋼板部品に溶接することが記載されている。  Japanese Patent Publication No. 07-066764, Japanese Patent No. 2903149 and Japanese Patent Application Laid-Open No. 2015-051457 include a circular flange, a male screw portion formed coaxially with the flange, and a close contact surface on the male screw portion side of the flange. It is described that the projection bolt formed by the formed welding projection is inserted into a hollow guide pin protruding from the pilot hole of the steel plate part and welded to the steel plate part.

特公平０７−０６７６２４号公報Japanese Patent Publication No. 07-066764 特許第２９０３１４９号公報Japanese Patent No. 2903149 特開２０１５−０５１４５７号公報Japanese Patent Laid-Open No. 2015-051457

上記のように、中空のガイドピンが突き出ている形式であると、溶着用突起の溶融箇所とガイドピンの間隔が短いので、溶融熱がガイドピンへ伝熱されやすくなり、このためガイドピンと一体化されている絶縁性合成樹脂で作られた摺動部材が過熱状態になる。これが原因で摺動部材の耐久性が低下する、という問題がある。また、上記摺動部材の形状が、小径部と大径部のように、２段構造となっている場合には、製作面での精度維持が高いレベルで要求され、製作工数低減や原価低減の面で好ましくない、という問題がある。  As described above, when the hollow guide pin protrudes, the distance between the melted portion of the welding projection and the guide pin is short, so that the heat of fusion is easily transferred to the guide pin. The sliding member made of the insulating synthetic resin is overheated. This causes a problem that the durability of the sliding member is lowered. In addition, when the shape of the sliding member is a two-stage structure, such as a small diameter part and a large diameter part, it is required to maintain a high level of accuracy on the manufacturing surface, reducing manufacturing man-hours and costs. There is a problem that this is not preferable.

本発明は、上記の問題点を解決するために提供されたもので、絶縁性のある合成樹脂材料で作られた摺動部材に対する熱的条件を緩和するとともに、電極におけるプロジェクションボルトの安定した支持を実現し、さらに、摺動部材の形状を簡素化することを目的とする。  The present invention has been provided to solve the above-described problems, and relaxes the thermal condition for a sliding member made of an insulating synthetic resin material and stably supports a projection bolt in an electrode. Furthermore, it aims at simplifying the shape of a sliding member.

請求項１記載の発明は、
円形のフランジと、フランジと同軸状態で形成された軸部と、フランジの軸部側の密着面に形成された溶着用突起によって構成されているとともに、溶着用突起が鋼板部品に溶着されるプロジェクションボルトが溶接の対象とされており、
電極本体に、電極本体の端面に開口する軸部の挿入孔と、この挿入孔に連通し摺動部材が摺動可能な状態で挿入される挿入孔よりも大径のガイド孔が形成され、
摺動部材は、絶縁性のある合成樹脂材料で円筒型に作られているとともに、その外周面に冷却空気の空気通路が設けられ、
摺動部材に嵌め込まれた金属製の支持部材にプロジェクションボルトの軸部が挿入される支持孔が挿入孔と同軸状態で形成され、
摺動部材の端面は支持部材の端面よりも突出した箇所に形成され、
摺動部材の端面とガイド孔の内端面が密着したり離れたりして、冷却空気の断続を行うように構成され、
挿入孔の内面に絶縁材が一体化されているか、または挿入孔と軸部の間に絶縁空隙が設けられていることを特徴とする電気抵抗溶接用電極である。The invention described in claim 1
A projection in which the welding protrusion is welded to the steel plate part, and is formed by a circular flange, a shaft portion formed coaxially with the flange, and a welding protrusion formed on the contact surface on the shaft portion side of the flange. Bolts are subject to welding,
The electrode body is formed with an insertion hole in the shaft portion that opens to the end face of the electrode body, and a guide hole having a diameter larger than the insertion hole that is inserted in a state where the sliding member is slidable in communication with the insertion hole.
The sliding member is made of an insulating synthetic resin material in a cylindrical shape, and an air passage for cooling air is provided on the outer peripheral surface thereof.
A support hole into which the shaft portion of the projection bolt is inserted into the metal support member fitted into the sliding member is formed coaxially with the insertion hole,
The end face of the sliding member is formed at a location protruding from the end face of the support member,
The end face of the sliding member and the inner end face of the guide hole are in close contact with each other and are configured to interrupt the cooling air.
An electrode for electrical resistance welding, wherein an insulating material is integrated on the inner surface of the insertion hole, or an insulating gap is provided between the insertion hole and the shaft portion.

電極本体に、電極本体の端面に開口する軸部の挿入孔と、この挿入孔に連通し摺動部材が摺動可能な状態で挿入される挿入孔よりも大径のガイド孔が形成され、この摺動部材は、絶縁性のある合成樹脂材料で円筒型に作られているとともに、その外周面に冷却空気の空気通路が設けられている。上述のように、電極本体には挿入孔とそれよりも大径のガイド孔が形成されるものであるから。挿入孔とガイド孔の形成が小径孔と大径孔の２種類だけでよく、機械加工などの面で簡素化され、製作が容易である。そして、摺動部材は円筒型でるから、小径部や大径部のような段付き形状ではなく、やはり構造簡素化の面で有利である。  The electrode body is formed with an insertion hole in the shaft portion that opens to the end face of the electrode body, and a guide hole having a diameter larger than the insertion hole that is inserted in a state where the sliding member is slidable in communication with the insertion hole. The sliding member is made of an insulating synthetic resin material in a cylindrical shape, and an air passage for cooling air is provided on the outer peripheral surface thereof. As described above, an insertion hole and a guide hole having a larger diameter than that are formed in the electrode body. The insertion hole and the guide hole need only be formed in two types, a small diameter hole and a large diameter hole, which is simplified in terms of machining and is easy to manufacture. Since the sliding member is cylindrical, it is not a stepped shape such as a small-diameter portion or a large-diameter portion, but is also advantageous in terms of simplifying the structure.

摺動部材に嵌め込まれた金属製の支持部材にプロジェクションボルトの軸部が挿入される支持孔が挿入孔と同軸状態で形成され、摺動部材の端面は支持部材の端面よりも突出した箇所に形成されている。つまり、支持孔が形成された支持部材の端面が、摺動部材の端面よりも後退した箇所に形成されているので、支持部材の端面と電極本体部分の一部であるガイド孔の内端面との間に空隙が形成される。このような空隙の存在により、支持部材に対する伝達熱量が少量化され、これにともなって合成樹脂製摺動部材への伝達熱量も低減される。したがって、摺動部材の熱的負担が軽減され、耐久性向上にとって有効となる。  A support hole into which the shaft portion of the projection bolt is inserted is formed coaxially with the insertion hole in the metal support member fitted into the slide member, and the end surface of the slide member is located at a position protruding from the end surface of the support member. Is formed. That is, since the end surface of the support member in which the support hole is formed is formed at a location that is retreated from the end surface of the sliding member, the end surface of the support member and the inner end surface of the guide hole that is a part of the electrode body portion A gap is formed between the two. Due to the presence of such voids, the amount of heat transferred to the support member is reduced, and accordingly, the amount of heat transferred to the synthetic resin sliding member is also reduced. Therefore, the thermal burden on the sliding member is reduced, which is effective for improving the durability.

そして、支持部材から中空管のような部材が伸びて電極本体の端面から突き出るような構造ではないので、溶融箇所から中空管を経て支持部材に到る熱流経路が形成されない。すなわち、溶着用突起の溶融部の熱は、主として電極本体に伝熱され、軸部を経由した支持部材や摺動部材に対する熱伝達が少量化される。同時に、溶融箇所と摺動部材との間隔距離が大きくなり、摺動部材に伝わる熱量が少量化される。したがって、摺動部材の熱的負担が軽減され、耐久性向上にとって有効となる。  In addition, since a member such as a hollow tube extends from the support member and protrudes from the end face of the electrode body, a heat flow path from the melted portion to the support member through the hollow tube is not formed. That is, the heat of the fusion part of the welding protrusion is mainly transferred to the electrode body, and the heat transfer to the support member and the sliding member via the shaft part is reduced. At the same time, the distance between the melted portion and the sliding member is increased, and the amount of heat transmitted to the sliding member is reduced. Therefore, the thermal burden on the sliding member is reduced, which is effective for improving the durability.

摺動部材の端面とガイド孔の内端面が密着したり離れたりして、冷却空気の断続を行うように構成されている。円筒状の摺動部材の端面がガイド孔の内端面に対して、密着したり離れたりする。筒状部材の端面が内端面に密着するので、密着面圧が十分な値になり、冷却空気の封止作用が確実になされる。  The end face of the sliding member and the inner end face of the guide hole are brought into close contact with each other, and the cooling air is interrupted. The end surface of the cylindrical sliding member is in close contact with or separated from the inner end surface of the guide hole. Since the end surface of the cylindrical member is in close contact with the inner end surface, the contact surface pressure becomes a sufficient value, and the cooling air sealing function is ensured.

電極本体の挿入孔と支持部材の支持孔が同軸状態になっているので、挿入孔に差し込まれたプロジェクションボルトの軸部は、確実に支持孔に挿入される。このため、支持孔の内面と軸部の外周部の間の空隙を小さくして、支持孔内における軸部の揺動量を少なくすることができ、電極に差し込まれたプロジェクションボルトの位置決めが確実に果たされ、軸部と鋼板部品に開けられた下孔との接触も回避でき、安定したプロジェクションボルトの電極支持が可能となる。  Since the insertion hole of the electrode body and the support hole of the support member are in a coaxial state, the shaft portion of the projection bolt inserted into the insertion hole is reliably inserted into the support hole. For this reason, the gap between the inner surface of the support hole and the outer peripheral portion of the shaft portion can be reduced to reduce the amount of rocking of the shaft portion in the support hole, and the positioning of the projection bolt inserted into the electrode is ensured. As a result, contact between the shaft portion and the pilot hole opened in the steel plate part can be avoided, and stable electrode support of the projection bolt is possible.

挿入孔の内面に絶縁材が一体化されているか、または挿入孔と軸部の間に絶縁空隙が設けられているので、絶縁機能が確実に達成されるとともに、軸部に対する溶接熱の伝達熱量が少量化され、これにともなって支持部材への伝達熱量が少なくなり、摺動部材の熱的耐久性が向上する。  Insulating material is integrated on the inner surface of the insertion hole, or an insulation gap is provided between the insertion hole and the shaft part, so that the insulation function can be reliably achieved and the amount of welding heat transferred to the shaft part Accordingly, the amount of heat transferred to the support member is reduced, and the thermal durability of the sliding member is improved.

摺動部材は円筒型であり、その内側に支持部材を挿入した構成が採用できるので、プロジェクションボルトの軸部を支持する部材と、ガイド孔で摺動機能を果たす部材の一体化が良好に行える。  Since the sliding member is a cylindrical type, and a structure in which a supporting member is inserted inside can be adopted, the member that supports the shaft portion of the projection bolt and the member that performs the sliding function by the guide hole can be integrated well. .

電極の各部の断面図である。It is sectional drawing of each part of an electrode. プロジェクションボルトの側面図である。It is a side view of a projection bolt.

つぎに、本発明にかかる電気抵抗溶接用電極を実施するための形態を説明する。  Below, the form for implementing the electrode for electrical resistance welding concerning this invention is demonstrated.

図１および図２は、本発明の実施例を示す。  1 and 2 show an embodiment of the present invention.

最初に、プロジェクションボルトについて説明する。  First, the projection bolt will be described.

溶接の対象とされる鉄製のプロジェクションボルト１は、円形のフランジ２と、フランジ２と同軸状態で形成された軸部３と、フランジ２の軸部３側の密着面に形成された溶着用突起４によって構成されている。この溶着用突起４は、一円周上に１２０度間隔で３個設けてある。プロジェクションボルト１の各部の寸法は、フランジ２の厚さも含めたボルト１の全長が３０ｍｍ、フランジ２の直径が２０ｍｍ、軸部３の全長が２８ｍｍである。なお、以下の説明において、プロジェクションボルトを単にボルトと表現する場合もある。  An iron projection bolt 1 to be welded includes a circular flange 2, a shaft portion 3 formed coaxially with the flange 2, and a welding protrusion formed on a close contact surface of the flange 2 on the shaft portion 3 side. 4. The three welding projections 4 are provided at intervals of 120 degrees on one circle. The dimensions of each part of the projection bolt 1 are such that the total length of the bolt 1 including the thickness of the flange 2 is 30 mm, the diameter of the flange 2 is 20 mm, and the total length of the shaft portion 3 is 28 mm. In the following description, the projection bolt may be simply expressed as a bolt.

つぎに、電極本体について説明する。  Next, the electrode body will be described.

銅合金製の電極本体５は、円筒状の形状であり、静止部材６に差し込まれる固定部７と、鋼板部品８が載置されるキャップ部９がねじ部１０において結合されている。電極本体５に、電極本体５の端面に開口する軸部３の挿入孔１２と、この挿入孔１２に連通し摺動部材１３が摺動可能な状態で挿入される挿入孔１２よりも大径のガイド孔１４が形成されている。挿入孔１２およびガイド孔１４は断面円形である。固定部７の側部に、圧縮された冷却空気をガイド孔１４に導入する通気口１５が設けてある。  The electrode body 5 made of copper alloy has a cylindrical shape, and a fixing portion 7 to be inserted into the stationary member 6 and a cap portion 9 on which the steel plate component 8 is placed are coupled at a screw portion 10. The electrode body 5 has a larger diameter than the insertion hole 12 of the shaft portion 3 that opens to the end surface of the electrode body 5 and the insertion hole 12 that communicates with the insertion hole 12 and is inserted in a slidable state. The guide hole 14 is formed. The insertion hole 12 and the guide hole 14 are circular in cross section. A vent 15 for introducing compressed cooling air into the guide hole 14 is provided on the side of the fixed portion 7.

つぎに、摺動部材について説明する。  Next, the sliding member will be described.

摺動部材１３は、絶縁性のある合成樹脂材料で円筒型に作られている。合成樹脂としては、耐熱性にも優れたものが望ましく、例えば、ポリテトラフルオロエチレン（商品名：テフロン）によって構成する。摺動部材１３の内側に嵌め込まれたステンレス鋼などの金属製の支持部材１６に、ボルト１の軸部３が挿入される支持孔１７が挿入孔１２と同軸状態で形成されている。支持孔１７、挿入孔１２およびガイド孔１４は、電極軸線Ｏ−Ｏと同軸状態で配列されている。ボルト１の軸部３を挿入孔１２から支持孔１７に挿入したとき、溶着用突起４と鋼板部品８の表面との間にわずかな隙間、例えば、１ｍｍの隙間が形成されるように、挿入孔１２や支持孔１７の長さが選定してある。支持孔１７は、摺動部材１３を押し下げるために、有底構造とされている。  The sliding member 13 is made of an insulating synthetic resin material in a cylindrical shape. The synthetic resin is preferably excellent in heat resistance, and is made of, for example, polytetrafluoroethylene (trade name: Teflon). A support hole 17 into which the shaft portion 3 of the bolt 1 is inserted is formed coaxially with the insertion hole 12 in a metal support member 16 such as stainless steel fitted inside the sliding member 13. The support hole 17, the insertion hole 12, and the guide hole 14 are arranged coaxially with the electrode axis OO. When the shaft portion 3 of the bolt 1 is inserted into the support hole 17 from the insertion hole 12, the insertion is performed so that a slight gap, for example, a gap of 1 mm is formed between the welding protrusion 4 and the surface of the steel plate part 8. The lengths of the holes 12 and the support holes 17 are selected. The support hole 17 has a bottomed structure in order to push down the sliding member 13.

摺動部材１３の外周面に、冷却空気の空気通路１８が設けられている。この空気通路１８は、図１（Ｂ）に示すように、摺動部材１３の外周面に電極軸線Ｏ−Ｏ方向の平面を設けて形成してある。これ以外に、図１（Ｄ）に示すように、断面円弧型の溝を電極軸線Ｏ−Ｏ方向に設けて、空気通路１８を構成することができる。  An air passage 18 for cooling air is provided on the outer peripheral surface of the sliding member 13. As shown in FIG. 1B, the air passage 18 is formed by providing a flat surface in the direction of the electrode axis OO on the outer peripheral surface of the sliding member 13. In addition to this, as shown in FIG. 1D, the air passage 18 can be configured by providing a circular arc-shaped groove in the electrode axis OO direction.

摺動部材１３の環状の端面１９は、支持部材１６の端面２０よりも突出した箇所に形成され、そのために、図１（Ｂ）に示すように、端面２０と内端面２１の間に空隙Ｃが形成されている。ガイド孔１４の内端面２１に、摺動部材１３の端面１９が密着したり離れたりして、空気通路１８からの冷却空気の断続を行うようになっている。平坦な端面１９と内端面２１は、電極軸線Ｏ−Ｏが垂直に貫通する仮想平面と平行になっている。端面１９を内端面２１に加圧状態で着座させるために、圧縮コイルばね２３が摺動部材１３とガイド孔１４の下側の内端面の間に配置してある。なお、符号２２は、絶縁材料で作られた絶縁シートである。  The annular end surface 19 of the sliding member 13 is formed at a location protruding from the end surface 20 of the support member 16. For this reason, as shown in FIG. 1B, a gap C is formed between the end surface 20 and the inner end surface 21. Is formed. The end surface 19 of the sliding member 13 is brought into close contact with or separated from the inner end surface 21 of the guide hole 14 so that the cooling air from the air passage 18 is intermittently connected. The flat end surface 19 and the inner end surface 21 are parallel to a virtual plane through which the electrode axis OO passes vertically. In order to seat the end surface 19 on the inner end surface 21 in a pressurized state, a compression coil spring 23 is disposed between the sliding member 13 and the lower inner end surface of the guide hole 14. Reference numeral 22 denotes an insulating sheet made of an insulating material.

支持部材１６を摺動部材１３と一体化する方法としては、支持部材１６を摺動部材１３内に圧入することが望ましい。ここでは、一体化を一層高めるために、支持部材１６と一体的に形成した固定ボルト２４を、摺動部材１３の底部材２５に貫通し、ワッシャ２６を組み付けてロックナット２７で締め付けてある。なお、摺動部材１３は、可動電極２８が動作して溶接電流が通電されたときに、電流はボルト１の溶着用突起４から鋼板部品８にのみ流れるように、絶縁機能を果たしている。  As a method for integrating the support member 16 with the slide member 13, it is desirable to press-fit the support member 16 into the slide member 13. Here, in order to further enhance the integration, a fixing bolt 24 formed integrally with the support member 16 is passed through the bottom member 25 of the sliding member 13, and a washer 26 is assembled and tightened with a lock nut 27. The sliding member 13 performs an insulating function so that when the movable electrode 28 is operated and a welding current is applied, the current flows only from the welding projection 4 of the bolt 1 to the steel plate part 8.

つぎに、挿入孔について説明する。  Next, the insertion hole will be described.

図１（Ａ）に示すように、前述の挿入孔１２の内面に、筒状の絶縁材２９が圧入や接着などにより、一体化されている。筒状の絶縁材２９は、耐熱性に優れた合成樹脂を用いるのが望ましく、ここではフェノール樹脂（商品名：ベークライト）が使用されている。絶縁材２９の内面と軸部３との間には、軸部挿入に必要な空隙が設けてあり、冷却空気はこの空隙を通過する。  As shown in FIG. 1A, a cylindrical insulating material 29 is integrated with the inner surface of the aforementioned insertion hole 12 by press-fitting or bonding. As the cylindrical insulating material 29, it is desirable to use a synthetic resin excellent in heat resistance. Here, a phenol resin (trade name: Bakelite) is used. A space necessary for inserting the shaft portion is provided between the inner surface of the insulating material 29 and the shaft portion 3, and the cooling air passes through this space.

または、図１（Ｂ）に示すように、上記絶縁材２９に換えて、絶縁空隙３０にすることも可能である。挿入孔１２の内径を図１（Ａ）に示したものよりも大きくして、挿入孔１２の内面と軸部３の間に絶縁空隙３０が設けられている。  Alternatively, as shown in FIG. 1B, an insulating gap 30 can be used instead of the insulating material 29. An insulating gap 30 is provided between the inner surface of the insertion hole 12 and the shaft portion 3 by making the inner diameter of the insertion hole 12 larger than that shown in FIG.

挿入孔１２に侵入したスパッタなどの不純物を排出したり、キャップ部９を冷却したりするために、挿入孔１２から外部に連通する通気孔３１がキャップ部９に設けてある。  A vent hole 31 communicating from the insertion hole 12 to the outside is provided in the cap part 9 in order to discharge impurities such as spatter that have entered the insertion hole 12 and to cool the cap part 9.

つぎに、溶接動作を説明する。  Next, the welding operation will be described.

図１（Ａ）は、電極本体５上に鋼板部品８が載置され、このときに下孔１１が挿入孔１２に対して、同軸状に合致した状態を示している。この状態のところへ軸部３が挿入孔１２に挿入され、支持部材１６の支持孔１７に嵌め込まれている。軸部３が挿入されるときには、挿入孔１２が支持孔１７と同軸になっているので、軸部３のセンタリング（心合わせ）が正常になされ、支持孔１７への挿入がなされる。この挿入状態において、軸部３の先端部は支持孔１７の底部に突き当たっており、溶着用突起４と鋼板部品８の間に僅かな空隙が形成されている。そして、圧縮コイルばね２３の張力により、摺動部材１３の端面１９はガイド孔１４の内端面２１に押し付けられており、冷却空気の通気が遮断されている。  FIG. 1A shows a state in which the steel plate component 8 is placed on the electrode body 5, and the lower hole 11 coincides coaxially with the insertion hole 12 at this time. In this state, the shaft portion 3 is inserted into the insertion hole 12 and is fitted into the support hole 17 of the support member 16. When the shaft portion 3 is inserted, since the insertion hole 12 is coaxial with the support hole 17, centering (centering) of the shaft portion 3 is normally performed and the insertion into the support hole 17 is performed. In this inserted state, the tip portion of the shaft portion 3 abuts against the bottom portion of the support hole 17, and a slight gap is formed between the welding projection 4 and the steel plate component 8. The end surface 19 of the sliding member 13 is pressed against the inner end surface 21 of the guide hole 14 by the tension of the compression coil spring 23, and the cooling air is blocked from flowing.

この状態において、可動電極２８が進出してボルト１を押し下げると、摺動部材１３も押し下げられ、端面１９は内端面２１から離れて、通気口１５からの冷却空気は、空気通路１８から端面１９と内端面２１間の空隙を通過し、挿入孔１２と軸部３間の間隙を通過して下孔１１から放出される。溶着用突起４が鋼板部品８に加圧され、溶接電流が通電されて、溶着がなされる。  In this state, when the movable electrode 28 advances and pushes down the bolt 1, the sliding member 13 is also pushed down, the end face 19 moves away from the inner end face 21, and the cooling air from the vent 15 passes from the air passage 18 to the end face 19. Passes through the gap between the inner end surface 21 and the inner hole 21, passes through the gap between the insertion hole 12 and the shaft 3, and is discharged from the lower hole 11. The welding protrusion 4 is pressed against the steel plate part 8 and a welding current is applied to perform welding.

以上に説明した実施例の作用効果は、つぎのとおりである。  The operational effects of the embodiment described above are as follows.

電極本体５に、電極本体５の端面に開口する軸部３の挿入孔１２と、この挿入孔１２に連通し摺動部材１３が摺動可能な状態で挿入される挿入孔１２よりも大径のガイド孔１４が形成され、この摺動部材１３は、絶縁性のある合成樹脂材料で円筒型に作られているとともに、その外周面に冷却空気の空気通路１８が設けられている。上述のように、電極本体５には挿入孔１２とそれよりも大径のガイド孔１４が形成されるものであるから。挿入孔１２とガイド孔１４の形成が小径孔と大径孔の２種類だけでよく、機械加工などの面で簡素化され、製作が容易である。そして、摺動部材１３は円筒型でるから、小径部や大径部のような段付き形状ではなく、やはり構造簡素化の面で有利である。  The electrode body 5 has a larger diameter than the insertion hole 12 of the shaft portion 3 that opens to the end surface of the electrode body 5 and the insertion hole 12 that communicates with the insertion hole 12 and is inserted in a slidable state. The sliding member 13 is made of an insulating synthetic resin material in a cylindrical shape, and an air passage 18 for cooling air is provided on the outer peripheral surface thereof. As described above, the electrode body 5 is formed with the insertion hole 12 and the guide hole 14 having a larger diameter. The insertion hole 12 and the guide hole 14 need only be formed in two types, a small diameter hole and a large diameter hole, which is simplified in terms of machining and is easy to manufacture. And since the sliding member 13 is a cylindrical type, it is not a stepped shape like a small diameter part or a large diameter part, but is also advantageous in terms of simplification of the structure.

摺動部材１３に嵌め込まれた金属製の支持部材１６にプロジェクションボルト１の軸部３が挿入される支持孔１７が挿入孔１２と同軸状態で形成され、摺動部材１３の端面１９は支持部材１６の端面２０よりも突出した箇所に形成されている。つまり、支持孔１７が形成された支持部材１６の端面２０が、摺動部材１３の端面１９よりも後退した箇所に形成されているので、支持部材１６の端面２０と電極本体部分の一部であるガイド孔１４の内端面２１との間に空隙Ｃが形成される。このような空隙Ｃの存在により、支持部材１６に対する伝達熱量が少量化され、これにともなって合成樹脂製摺動部材１３への伝達熱量も低減される。したがって、摺動部材１３の熱的負担が軽減され、耐久性向上にとって有効となる。  A support hole 17 into which the shaft portion 3 of the projection bolt 1 is inserted is formed coaxially with the insertion hole 12 in a metal support member 16 fitted into the slide member 13, and an end surface 19 of the slide member 13 is a support member. It is formed at a location protruding from 16 end faces 20. That is, since the end surface 20 of the support member 16 in which the support hole 17 is formed is formed at a position retracted from the end surface 19 of the sliding member 13, the end surface 20 of the support member 16 and a part of the electrode main body portion are formed. A gap C is formed between the inner end face 21 of a certain guide hole 14. Due to the presence of such a gap C, the amount of heat transferred to the support member 16 is reduced, and accordingly, the amount of heat transferred to the synthetic resin sliding member 13 is also reduced. Therefore, the thermal burden on the sliding member 13 is reduced, which is effective for improving the durability.

支持部材１６の端面２０とガイド孔１４の内端面２１の間に形成された厚さＣなる空間は、電極本体５の断面方向で見た領域が広く形成されている。このため、内端面２１から支持部材１６に伝達される溶接熱が、上記空間において十分に遮断され、摺動部材１３への熱量も少量化されて、摺動部材１３の熱的耐久性向上にとって有効である。  A space having a thickness C formed between the end face 20 of the support member 16 and the inner end face 21 of the guide hole 14 has a wide area viewed in the cross-sectional direction of the electrode body 5. For this reason, the welding heat transmitted from the inner end surface 21 to the support member 16 is sufficiently blocked in the space, and the amount of heat to the sliding member 13 is also reduced, thereby improving the thermal durability of the sliding member 13. It is valid.

さらに、キャップ部９の内径を摺動部材１３の直径よりも大きく設定することにより、摺動部材１３の上部の外周側に空間３２が形成される。このような空間３２は、上記の厚さＣなる空間と合算されて、断熱範囲を拡大し、有効な断熱が達成される。  Further, by setting the inner diameter of the cap portion 9 to be larger than the diameter of the sliding member 13, a space 32 is formed on the outer peripheral side of the upper portion of the sliding member 13. Such a space 32 is combined with the space having the thickness C described above to expand the heat insulation range and achieve effective heat insulation.

そして、支持部材１６から中空管のような部材が伸びて電極本体５の端面から突き出るような構造ではないので、溶融箇所から中空管を経て支持部材１３に到る熱流経路が形成されない。すなわち、溶着用突起４の溶融部の熱は、主として電極本体５に伝熱され、軸部３を経由した支持部材１６や摺動部材１３に対する熱伝達が少量化される。同時に、溶融箇所と摺動部材１３との離隔距離が大きくなり、摺動部材１３に伝わる熱量が少量化される。したがって、摺動部材１３の熱的負担が軽減され、耐久性向上にとって有効となる。  In addition, since a member such as a hollow tube extends from the support member 16 and protrudes from the end face of the electrode body 5, a heat flow path from the melted portion to the support member 13 through the hollow tube is not formed. That is, the heat of the melted portion of the welding protrusion 4 is mainly transferred to the electrode body 5 and the heat transfer to the support member 16 and the sliding member 13 via the shaft portion 3 is reduced. At the same time, the separation distance between the melted portion and the sliding member 13 is increased, and the amount of heat transmitted to the sliding member 13 is reduced. Therefore, the thermal burden on the sliding member 13 is reduced, which is effective for improving the durability.

摺動部材１３の端面１９とガイド孔１４の内端面２１が密着したり離れたりして、冷却空気の断続を行うように構成されている。円筒状の摺動部材１３の端面１９がガイド孔１４の内端面２１に対して、密着したり離れたりする。筒状部材の端面１９が内端面２１に密着するので、密着面圧が十分な値になり、冷却空気の封止作用が確実になされる。  The end surface 19 of the sliding member 13 and the inner end surface 21 of the guide hole 14 are in close contact with each other and are separated from each other so that the cooling air is interrupted. The end surface 19 of the cylindrical sliding member 13 is brought into close contact with or separated from the inner end surface 21 of the guide hole 14. Since the end surface 19 of the tubular member is in close contact with the inner end surface 21, the contact surface pressure becomes a sufficient value, and the cooling air sealing function is reliably performed.

電極本体５の挿入孔１２と支持部材１６の支持孔１７が同軸状態になっているので、挿入孔１２に差し込まれたボルト１の軸部３は、確実に支持孔１７に挿入される。このため、支持孔１７の内面と軸部３の外周部の間の空隙を小さくして、支持孔１７内における軸部３の揺動量を少なくすることができ、電極に差し込まれたボルト１の位置決めが確実に果たされ、軸部３と鋼板部品８に開けられた下孔１１との接触も回避でき、安定したボルト１の電極支持が可能となる。  Since the insertion hole 12 of the electrode body 5 and the support hole 17 of the support member 16 are coaxial, the shaft portion 3 of the bolt 1 inserted into the insertion hole 12 is reliably inserted into the support hole 17. For this reason, the space | gap between the inner surface of the support hole 17 and the outer peripheral part of the axial part 3 can be made small, and the rocking | fluctuation amount of the axial part 3 in the support hole 17 can be decreased, and the bolt 1 inserted in the electrode can be reduced. Positioning is achieved reliably, contact between the shaft portion 3 and the prepared hole 11 opened in the steel plate part 8 can be avoided, and stable electrode support of the bolt 1 is possible.

挿入孔１２の内面に絶縁材２９が一体化されているか、または挿入孔１２と軸部３の間に絶縁空隙３０が設けられているので、絶縁機能が確実に達成されるとともに、軸部３に対する溶接熱の伝達熱量が少量化され、これにともなって支持部材１６への伝達熱量が少なくなり、摺動部材１３の熱的耐久性が向上する。  Since the insulating material 29 is integrated on the inner surface of the insertion hole 12 or the insulating gap 30 is provided between the insertion hole 12 and the shaft portion 3, the insulating function is reliably achieved, and the shaft portion 3. As a result, the amount of heat transferred to the support member 16 is reduced, so that the heat durability of the sliding member 13 is improved.

摺動部材１３は円筒型であり、その内側に支持部材１６を挿入した構成が採用できるので、ボルト１の軸部３を支持する部材と、ガイド孔１４で摺動機能を果たす部材の一体化が良好に行える。  Since the sliding member 13 has a cylindrical shape and a configuration in which a supporting member 16 is inserted inside can be adopted, a member that supports the shaft portion 3 of the bolt 1 and a member that performs a sliding function by the guide hole 14 are integrated. Can be performed well.

上述のように本発明の電気抵抗溶接用電極によれば、絶縁性のある合成樹脂材料で作られた摺動部材に対する熱的条件を緩和するとともに、電極におけるプロジェクションボルトの安定した支持を実現し、さらに、摺動部材の形状を簡素化する。したがって、自動車の車体溶接工程や、家庭電化製品の板金溶接工程などの広い産業分野で利用できる。  As described above, according to the electrode for electric resistance welding of the present invention, the thermal condition for the sliding member made of an insulating synthetic resin material is eased, and stable support of the projection bolt on the electrode is realized. Furthermore, the shape of the sliding member is simplified. Therefore, it can be used in a wide range of industrial fields such as automobile body welding processes and home appliance sheet metal welding processes.

１ プロジェクションボルト
３ 軸部
５ 電極本体
８ 鋼板部品
１１ 下孔
１２ 挿入孔
１３ 摺動部材
１４ ガイド孔
１６ 支持部材
１７ 支持孔
１８ 空気通路
１９ 摺動部材の端面
２０ 支持部材の端面
２１ ガイド孔の内端面
２９ 絶縁材
３０ 絶縁空隙
Ｃ 空隙
Ｏ−Ｏ 電極軸線DESCRIPTION OF SYMBOLS 1 Projection bolt 3 Shaft part 5 Electrode main body 8 Steel plate part 11 Lower hole 12 Insertion hole 13 Sliding member 14 Guide hole 16 Support member 17 Support hole 18 Air passage 19 End surface 20 of a sliding member End surface 21 of a supporting member End face 29 Insulating material 30 Insulating air gap C Air gap OO Electrode axis

Claims (1)

円形のフランジと、フランジと同軸状態で形成された軸部と、フランジの軸部側の密着面に形成された溶着用突起によって構成されているとともに、溶着用突起が鋼板部品に溶着されるプロジェクションボルトが溶接の対象とされており、
電極本体に、電極本体の端面に開口する軸部の挿入孔と、この挿入孔に連通し摺動部材が摺動可能な状態で挿入される挿入孔よりも大径のガイド孔が形成され、
摺動部材は、絶縁性のある合成樹脂材料で円筒型に作られているとともに、その外周面に冷却空気の空気通路が設けられ、
摺動部材に嵌め込まれた金属製の支持部材にプロジェクションボルトの軸部が挿入される支持孔が挿入孔と同軸状態で形成され、
摺動部材の端面は支持部材の端面よりも突出した箇所に形成され、
摺動部材の端面とガイド孔の内端面が密着したり離れたりして、冷却空気の断続を行うように構成され、
挿入孔の内面に絶縁材が一体化されているか、または挿入孔と軸部の間に絶縁空隙が設けられていることを特徴とする電気抵抗溶接用電極。A projection in which the welding protrusion is welded to the steel plate part, and is formed by a circular flange, a shaft portion formed coaxially with the flange, and a welding protrusion formed on the contact surface on the shaft portion side of the flange. Bolts are subject to welding,
The electrode body is formed with an insertion hole in the shaft portion that opens to the end face of the electrode body, and a guide hole having a diameter larger than the insertion hole that is inserted in a state where the sliding member is slidable in communication with the insertion hole.
The sliding member is made of an insulating synthetic resin material in a cylindrical shape, and an air passage for cooling air is provided on the outer peripheral surface thereof.
A support hole into which the shaft portion of the projection bolt is inserted into the metal support member fitted into the sliding member is formed coaxially with the insertion hole,
The end face of the sliding member is formed at a location protruding from the end face of the support member,
The end face of the sliding member and the inner end face of the guide hole are in close contact with each other and are configured to interrupt the cooling air.
An electrode for electrical resistance welding, wherein an insulating material is integrated on the inner surface of the insertion hole, or an insulating gap is provided between the insertion hole and the shaft portion.
JP2015217080A 2015-10-17 2015-10-17 Electric resistance-welding electrode Pending JP2017074616A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020032458A (en) * 2018-08-29 2020-03-05 青山　省司 Electrode for electric resistance welding

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020032458A (en) * 2018-08-29 2020-03-05 青山　省司 Electrode for electric resistance welding

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