JP5477957B2

JP5477957B2 - Gas shield arc torch power supply

Info

Publication number: JP5477957B2
Application number: JP2010110987A
Authority: JP
Inventors: 柳平 ▲高▼木; 恭央赤尾; 武夫蕗澤
Original assignee: Shinkokiki Co Ltd
Current assignee: Shinkokiki Co Ltd
Priority date: 2010-05-13
Filing date: 2010-05-13
Publication date: 2014-04-23
Anticipated expiration: 2030-05-13
Also published as: JP2011235343A

Description

本発明は、ガスシールドアーク溶接に用いられるトーチの給電部に関する。 The present invention relates to a power supply unit of a torch used for gas shielded arc welding.

従来から、自動車のホワイトボデーや自動車部品の製造等に、ＭＡＧ溶接やＭＩＧ溶接等のガスシールドアーク溶接が利用されている。ガスシールドアーク溶接に用いられるアーク溶接用トーチ５０は、図５に示されるように、ソリッドワイヤが送り出される略弾丸形状のコンタクトチップ５５と、このコンタクトチップ５５の基部を保持する円筒形状のチップホルダ５１と、コンタクトチップ５５及びチップホルダ５１を包容するように配設された筒状のシールドノズル５２と、シールドノズル５２及びチップホルダ５１が取り付けられるノズルホルダ５３とから構成されている。コンタクトチップ５５には、ソリッドワイヤが挿通されるワイヤ挿通穴５５ａが連通形成されている。ガスシールドアーク溶接は、連続的に送り出されるソリッドワイヤに、コンタクトチップ５５を介して大電流を流して、前記ソリッドワイヤと被溶接部材との間でアークを発生させ（放電させ）、その際に発生する熱により、前記ソリッドワイヤや被溶接部材を溶かして、被溶接部材を溶接する溶接方法である。溶接を行う際には、溶接箇所と空気とが接触することによるブローホールの発生を防止するために、チップホルダ５１に形成されたガス供給口５１ａからＣＯ^２やアルゴン等の不活性ガスを供給し、シールドノズル５２の先端から溶接箇所に前記不活性ガスを供給して、溶接箇所と空気の接触を防止している。シールドノズル５２は、不活性ガスの拡散を防止し、確実に溶接箇所に不活性ガスを供給するためのものである。 Conventionally, gas shielded arc welding such as MAG welding and MIG welding has been used for manufacturing white bodies of automobiles and automobile parts. As shown in FIG. 5, an arc welding torch 50 used for gas shielded arc welding includes a substantially bullet-shaped contact tip 55 through which a solid wire is fed, and a cylindrical tip holder that holds the base of the contact tip 55. 51, a cylindrical shield nozzle 52 disposed so as to enclose the contact chip 55 and the chip holder 51, and a nozzle holder 53 to which the shield nozzle 52 and the chip holder 51 are attached. The contact tip 55 is formed with a wire insertion hole 55a through which a solid wire is inserted. In gas shielded arc welding, a large current is passed through a solid wire fed continuously through a contact tip 55 to generate an arc (discharge) between the solid wire and a member to be welded. In this welding method, the solid wire and the member to be welded are melted by the generated heat to weld the member to be welded. When welding is performed, an inert gas such as CO ² or argon is supplied from a gas supply port 51 a formed in the chip holder 51 in order to prevent blowholes from being generated due to contact between the welding location and air. Then, the inert gas is supplied from the tip of the shield nozzle 52 to the welding location to prevent contact between the welding location and air. The shield nozzle 52 prevents the inert gas from diffusing and reliably supplies the inert gas to the welded portion.

ソリッドワイヤはコンタクトチップ５５のワイヤ挿通穴５５ａと接触して溶接電流が供給されるため、ワイヤ挿通穴５５ａとソリッドワイヤとのクリアランスは、小さい方が好ましく、長時間アーク溶接を行い前記クリアランスが大きくなると、コンタクトチップからソリッドワイヤに通電しない時間が発生し、アークが不安定になり、溶接不良が発生してしまう。 Since the solid wire comes into contact with the wire insertion hole 55a of the contact tip 55 and welding current is supplied, the clearance between the wire insertion hole 55a and the solid wire is preferably small, and arc clearance is performed for a long time by performing arc welding. In this case, a time during which the solid wire is not energized from the contact tip occurs, the arc becomes unstable, and poor welding occurs.

そこで、上記問題を解決するために、特許文献１に示されるように、コンタクトチップの内部に、ソリッドワイヤをワイヤ挿通穴に押し当てる板バネをコンタクトチップの内部に設け、確実にソリッドワイヤがワイヤ挿通穴に押し当てられるコンタクトチップが提案されている。このような特許文献１に示されるようなコンタクトチップを使用すれば、長時間アーク溶接を行ったとしても、前記板バネの付勢力により、確実にソリッドワイヤがワイヤ挿通穴に押し当てられ、ソリッドワイヤへの給電不良が発生することが無い。 Therefore, in order to solve the above problem, as shown in Patent Document 1, a leaf spring that presses the solid wire against the wire insertion hole is provided inside the contact chip, so that the solid wire is securely connected to the wire. A contact tip that is pressed against the insertion hole has been proposed. If such a contact tip as shown in Patent Document 1 is used, even if arc welding is performed for a long time, the solid wire is surely pressed against the wire insertion hole by the urging force of the leaf spring, so that the solid There is no failure in feeding power to the wire.

特許３２１８３４０号公報Japanese Patent No. 3218340

ところが、板バネによりソリッドワイヤをワイヤ挿通穴に押し当てるので、ソリッドワイヤがワイヤ挿通穴５５ａから偏心して曲がった状態で送出され、ソリッドワイヤの狙い位置がズレ、溶接位置がズレてしまう。ソリッドワイヤがトーチ５７の移動方向に曲がって送給される場合には、溶接位置がズレないので問題とならないが、ソリッドワイヤがトーチ５７の進行方向と直交する方向に曲がって送給される場合には、溶接位置が大きくズレてしまい、所望の位置を溶接することができないという問題があった。
本発明は、上記問題を解決し、ソリッドワイヤへの給電不良を防止しつつ、ソリッドワイヤの狙い位置ズレを抑止することができるガスシールドアーク用トーチの給電部を提供することを目的とする。 However, since the solid wire is pressed against the wire insertion hole by the plate spring, the solid wire is sent out in a state of being bent eccentrically from the wire insertion hole 55a, and the target position of the solid wire is shifted and the welding position is shifted. When the solid wire is bent and fed in the moving direction of the torch 57, there is no problem because the welding position is not shifted, but when the solid wire is bent and fed in the direction orthogonal to the traveling direction of the torch 57 However, there is a problem that the welding position is greatly displaced, and a desired position cannot be welded.
An object of the present invention is to solve the above-mentioned problems and to provide a power supply part of a gas shield arc torch capable of suppressing a misalignment of a target position of a solid wire while preventing a power supply failure to the solid wire.

上記課題を解決するためになされた請求項１に記載の発明は、
ソリッドワイヤが挿通し、当該ソリッドワイヤに溶接電流を給電するガスシールドアーク溶接用トーチの給電部において、
下端部に雄ネジ部が形成され、下端に給電面が形成された筒状のチップホルダ本体と、
上端に受電面が形成された固定部が上端に突設され、下端から上端にかけて順に、ワイヤ接触部と前記ワイヤ接触部よりも幅広の幅広部からなるワイヤ挿通穴が軸心に連通形成されたコンタクトチップと、
前記幅広部に挿通され前記軸心から偏心した形状の偏心部を有し、前記コンタクトチップの内部に取り付けられた偏心部材と、
上部内周面に前記雄ネジ部と螺合する雌ネジ部が形成され、前記雌ネジ部の下側に前記固定部に対応した形状の固定部係合部が形成された固定部材とを有し、
前記固定部が前記固定部係合部に係合された状態で、前記雌ネジ部が前記雄ネジ部に螺合されることにより前記固定部材が前記チップホルダ本体に締め付けられて、前記受電面が前記給電面に密接した状態で、前記コンタクトチップが前記チップホルダ本体に取り付けられていることを特徴とする。 The invention according to claim 1, which has been made to solve the above problems,
In the power supply part of the gas shield arc welding torch for inserting a solid wire and supplying a welding current to the solid wire,
A cylindrical chip holder body in which a male screw part is formed at the lower end and a power feeding surface is formed at the lower end,
A fixed portion having a power receiving surface formed at the upper end protrudes from the upper end, and a wire insertion hole comprising a wire contact portion and a wider portion wider than the wire contact portion is formed in communication with the shaft center in order from the lower end to the upper end. Contact chips,
An eccentric member that is inserted through the wide portion and has an eccentric portion that is eccentric from the axis, and is attached to the inside of the contact chip;
The upper inner peripheral surface has a female screw portion that is screwed with the male screw portion, and a fixing member that has a fixing portion engaging portion having a shape corresponding to the fixing portion below the female screw portion. And
In a state where the fixing portion is engaged with the fixing portion engaging portion, the fixing member is fastened to the chip holder body by screwing the female screw portion into the male screw portion, and the power receiving surface The contact tip is attached to the tip holder body in a state of being in close contact with the power feeding surface.

請求項２に記載の発明は、請求項１に記載の発明において、
偏心部は、曲げられた管状であることを特徴とする。
これにより、偏心部内を挿通するソリッドワイヤは、確実に偏心部ワイヤ挿通穴の軸心に対して偏心して送給されるので、ソリッドワイヤがワイヤ挿通穴のワイヤ接触部に確実に接触される。 The invention according to claim 2 is the invention according to claim 1,
The eccentric portion is a bent tubular shape.
Thereby, the solid wire inserted through the eccentric portion is reliably fed eccentrically with respect to the shaft center of the eccentric portion wire insertion hole, so that the solid wire is reliably brought into contact with the wire contact portion of the wire insertion hole.

請求項３に記載の発明は、請求項１又は請求項２に記載の発明において、
コンタクトチップの固定部の下側には、前記固定部よりも幅寸法が小さい首部が形成され、
固定部材の固定部係合部の下側には、前記首部の幅寸法よりも大きく前記固定部係合部の幅寸法よりも小さい幅寸法の空間であり、固定部材の下端に開口する首部受容部が形成され、
固定部材の外周面には、固定部係合部と連通する固定部侵入口と、首部受容部に連通する首部侵入口が形成され、
コンタクトチップの固定部の外周面には、互いの平行な面取面が２つ形成され、
前記２つの面取面間寸法は、前記固定部侵入口の幅寸法よりも小さく、
前記面取面が形成されていない部分の固定部の幅寸法は、前記固定部侵入口の幅寸法よりも大きく、
前記首部の幅寸法は、前記首部侵入口の幅寸法よりも小さく構成され、
前記固定部が前記固定部係合部に係合されるとともに、前記首部が前記首部受容部に受容されて、コンタクトチップが固定部材に固定されていることを特徴とする。
これにより、コンタクトチップの固定部を、簡単に固定部侵入口から固定部係合部内に挿通させることができ、コンタクトチップを回転させるだけで、簡単に固定部を固定部係合部に係合させることが可能となるので、ガスシールドアーク溶接用トーチの給電部の組付作業が容易となる。
また、固定部係合部に係合された固定部は、固定部係合部と首部受容部の境界に形成された段差面により確実に押圧されるので、確実に受電面と給電面とが密接し、確実にチップホルダ本体からコンタクトチップに溶接電流が給電される。 The invention according to claim 3 is the invention according to claim 1 or 2,
A neck part having a smaller width than the fixed part is formed below the fixed part of the contact chip,
Below the fixing part engaging part of the fixing member is a space having a width dimension larger than the width dimension of the neck part and smaller than the width dimension of the fixing part engaging part, and receiving the neck part opening at the lower end of the fixing member Part is formed,
On the outer peripheral surface of the fixing member, there are formed a fixed portion entry port communicating with the fixed portion engaging portion, and a neck portion entry port communicating with the neck receiving portion,
Two parallel chamfered surfaces are formed on the outer peripheral surface of the fixed portion of the contact chip,
The dimension between the two chamfered surfaces is smaller than the width dimension of the fixed portion entrance,
The width dimension of the fixed part where the chamfered surface is not formed is larger than the width dimension of the fixed part entry port,
The width of the neck is configured to be smaller than the width of the neck entry hole,
The fixing part is engaged with the fixing part engaging part, the neck part is received by the neck part receiving part, and the contact tip is fixed to the fixing member.
As a result, the fixed part of the contact chip can be easily inserted into the fixed part engaging part from the fixed part entry port, and the fixed part can be easily engaged with the fixed part engaging part simply by rotating the contact chip. Therefore, the assembly work of the power feeding part of the gas shield arc welding torch is facilitated.
In addition, since the fixing portion engaged with the fixing portion engaging portion is surely pressed by the step surface formed at the boundary between the fixing portion engaging portion and the neck receiving portion, the power receiving surface and the power feeding surface are surely connected. The welding current is supplied from the tip holder body to the contact tip reliably.

請求項４に記載の発明は、請求項１〜請求項３に記載の発明において、
コンタクトチップは、
固定部が形成され固定部材に固定されるチップ取付部材と、
前記チップ取付部材に取り付けられ、先端にワイヤ挿通穴の接触部が形成された交換チップとから構成されていることを特徴とする。
これにより、ワイヤ挿通穴のワイヤ接触部が摩耗した場合であっても、交換チップのみを交換すればいいので、ランニングコストを低減させることが可能となる。 The invention according to claim 4 is the invention according to claims 1 to 3,
Contact tip
A chip mounting member formed with a fixing portion and fixed to the fixing member;
It is comprised from the replacement | tip chip | tip attached to the said chip | tip attachment member, and the contact part of the wire penetration hole was formed in the front-end | tip.
As a result, even if the wire contact portion of the wire insertion hole is worn, it is only necessary to replace the replacement tip, so that the running cost can be reduced.

本発明によれば、下端部に雄ネジ部が形成され、下端に給電面が形成された筒状のチップホルダ本体と、上端に受電面が形成された固定部が上端に突設され、下端から上端にかけて順に、ワイヤ接触部と前記ワイヤ接触部よりも幅広の幅広部からなるワイヤ挿通穴が軸心に連通形成されたコンタクトチップと、前記幅広部に挿通され前記軸心から偏心した偏心部を有し、前記コンタクトチップの内部に取り付けられた偏心部材と、上部内周面に前記雄ネジ部と螺合する雌ネジ部が形成され、前記雌ネジ部の下側に前記固定部に対応した形状の固定部係合部が形成された固定部材とを有し、前記固定部が前記固定部係合部に係合された状態で、前記雌ネジ部が前記雄ネジ部に螺合されることにより前記固定部材が前記チップホルダ本体に締め付けられて、前記受電面が前記給電面に密接した状態で、前記コンタクトチップが前記チップホルダ本体に取り付けられていることを特徴とする。
このため、固定部材をチップホルダ本体に対して緩める方向に回転させて、コンタクトチップを回転させることにより、偏心部材の偏心部の偏心方向を変化させることができ、ソリッドワイヤの狙い位置ズレを抑止することが可能となる。
また、偏心部材の偏心部により、ワイヤはワイヤ挿通穴に対して偏心して送給され、ワイヤはワイヤ接触部に確実に接触するので、ソリッドワイヤへの給電不良が防止される。 According to the present invention, the cylindrical chip holder main body having the male screw portion formed at the lower end and the power feeding surface formed at the lower end, and the fixed portion having the power receiving surface formed at the upper end projecting from the upper end. In order from the upper end to the upper end, a contact tip in which a wire insertion hole composed of a wire contact portion and a wide portion wider than the wire contact portion is formed to communicate with the shaft center, and an eccentric portion that is inserted through the wide portion and eccentric from the shaft center. An eccentric member attached to the inside of the contact chip, and a female screw part that is screwed to the male screw part on the inner peripheral surface of the upper part, and corresponds to the fixing part on the lower side of the female screw part A fixing member formed with a fixing portion engaging portion of the shape, and the female screw portion is screwed to the male screw portion in a state where the fixing portion is engaged with the fixing portion engaging portion. The fixing member is fastened to the chip holder body by It is, in a state where the power receiving surface is in close contact with the feed surface, wherein the contact tip is attached to the tip holder body.
For this reason, the eccentric direction of the eccentric part of the eccentric member can be changed by rotating the contact member by rotating the fixing member in the loosening direction with respect to the chip holder body, thereby suppressing the target position deviation of the solid wire. It becomes possible to do.
In addition, the eccentric portion of the eccentric member feeds the wire eccentrically with respect to the wire insertion hole, and the wire reliably contacts the wire contact portion, thus preventing a power supply failure to the solid wire.

本発明のガスシールドアーク溶接用トーチの給電部の組図である。It is a set figure of the electric power feeding part of the torch for gas shielded arc welding of the present invention. 本発明のガスシールドアーク溶接用トーチの給電部の部品図である。It is a components figure of the electric power feeding part of the torch for gas shielded arc welding of this invention. 固定部材及びチップ取付部材の外観図である。It is an external view of a fixing member and a chip attachment member. コンタクトチップの別例の説明図である。It is explanatory drawing of another example of a contact chip. 従来のアーク溶接用トーチの説明図である。It is explanatory drawing of the conventional arc welding torch.

以下に図面を参照しつつ、本発明の好ましい実施の形態を示す。図１の左半分は、ガスシールドアーク溶接用トーチの給電部１０（以下単に給電部１０と略す）の要部の外観図であり、図１の右半分は給電部１０の要部の断面図である。また、図２の左半分は、給電部１０を構成する部品の外観図であり、図１の右半分は給電部１０を構成する部品の断面図である。本発明の給電部１０は、チップホルダ１、コンタクトチップ２、偏心部材６とから構成されている。 Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. The left half of FIG. 1 is an external view of the main part of the power supply part 10 (hereinafter simply referred to as the power supply part 10) of the gas shield arc welding torch, and the right half of FIG. It is. Further, the left half of FIG. 2 is an external view of components constituting the power feeding unit 10, and the right half of FIG. 1 is a cross-sectional view of components constituting the power feeding unit 10. The power feeding unit 10 of the present invention includes a chip holder 1, a contact chip 2, and an eccentric member 6.

図１や図２に示されるように、チップホルダ１は、チップホルダ本体３と固定部材４とから構成されている。チップホルダ本体３及び固定部材４は、強靱で導電性に優れたベリリウム銅やクロム銅等の銅合金で構成されている。図２に示されるように、チップホルダ本体３は、略円筒形状である。チップホルダ本体３の上部の外周には、ネジ山が螺刻されて、ノズルホルダ取付部３ａが形成されている。ノズルホルダ取付部３ａには、ノズルホルダ５３（図５に示す）が取り付けられる。チップホルダ本体３の下端部の外周には、ネジ山が螺刻されて、雄ネジ部３ｂが形成されている。チップホルダ本体３の下端には、チップホルダ本体３の長手方向（軸方向）と直交する平面である給電面３ｃが形成されている。チップホルダ本体３の下部の外周面には、チップホルダ本体３の内部に連通するガス供給口３ｄが連通形成されている。チップホルダ本体３の内部を、ＣＯ^２やアルゴン等の不活性ガスが流通して、当該不活性ガスが、ガス供給口３ｄからシールドノズル５２（図５に示す）内に供給されるようになっている。 As shown in FIGS. 1 and 2, the chip holder 1 is composed of a chip holder main body 3 and a fixing member 4. The chip holder main body 3 and the fixing member 4 are made of a copper alloy such as beryllium copper or chromium copper which is tough and excellent in conductivity. As shown in FIG. 2, the chip holder body 3 has a substantially cylindrical shape. On the outer periphery of the upper part of the chip holder main body 3, a screw thread is screwed to form a nozzle holder mounting portion 3a. A nozzle holder 53 (shown in FIG. 5) is attached to the nozzle holder attaching portion 3a. On the outer periphery of the lower end portion of the chip holder main body 3, a screw thread is threaded to form a male screw portion 3b. At the lower end of the chip holder body 3, a power feeding surface 3c that is a plane orthogonal to the longitudinal direction (axial direction) of the chip holder body 3 is formed. A gas supply port 3 d communicating with the inside of the chip holder main body 3 is formed in communication with the outer peripheral surface of the lower portion of the chip holder main body 3. An inert gas such as CO ² or argon flows through the inside of the chip holder main body 3, and the inert gas is supplied into the shield nozzle 52 (shown in FIG. 5) from the gas supply port 3d. ing.

図３に示されるように、固定部材４は略円筒形状である。なお、図３の（Ｂ）は、図３の（Ａ）を９０°回転させた方向から見たＡ−Ａ矢視図である。また、図３の（Ｄ）は、図３の（Ｃ）を９０°回転させた方向から見たＢ−Ｂ矢視図である。図３の（Ａ）に示されるように、固定部材４の上部内周面には、チップホルダ本体３の雄ネジ部３ｂと螺合する雌ネジ部４ｃが螺刻されている。固定部材４の雌ネジ部４ｃの下方には、後述するチップ取付部材５の固定部５ａに対応した形状の空間である固定部係合部４ｅが形成されている。本実施形態では、固定部係合部４ｅは、円柱形状の空間となっている。固定部材４の中間部分の外周面には、固定部係合部４ｅと連通する固定部侵入口４ａが形成されている。固定部材４の固定部係合部４ｅの下側には、固定部係合部４ｅと連通し、固定部材４の下端に開口する首部受容部４ｆが形成されている。首部受容部４ｆは、後述するチップ取付部材５の首部５ｂの幅寸法よりも大きく、固定部係合部４ｅの幅寸法よりも小さい幅寸法の空間である。本実施形態では、首部受容部４ｆは、円柱形状の空間である。固定部材４の外周面には、首部受容部４ｆと連通する首部侵入口４ｂが形成されている。首部受容部４ｆの内径は、固定部係合部４ｅの内径よりも小さくなっている。このため、固定部係合部４ｅと首部受容部４ｆの境界には段差面４ｇが形成されている。固定部材４の上部には、ローレット加工等により形成された滑り止め加工部４ｄが形成されている。 As shown in FIG. 3, the fixing member 4 has a substantially cylindrical shape. Note that FIG. 3B is a view taken along the line AA when viewed from the direction in which FIG. Moreover, (D) of FIG. 3 is a BB arrow line view seen from the direction which (C) of FIG. 3 rotated 90 degrees. As shown in FIG. 3A, a female screw part 4 c that is screwed into the male screw part 3 b of the chip holder body 3 is threaded on the upper inner peripheral surface of the fixing member 4. A fixed portion engaging portion 4e, which is a space corresponding to a fixed portion 5a of a chip mounting member 5 to be described later, is formed below the female screw portion 4c of the fixed member 4. In the present embodiment, the fixed portion engaging portion 4e is a cylindrical space. On the outer peripheral surface of the intermediate portion of the fixing member 4, a fixing portion entry port 4 a that communicates with the fixing portion engaging portion 4 e is formed. A neck receiving portion 4 f that communicates with the fixing portion engaging portion 4 e and opens at the lower end of the fixing member 4 is formed below the fixing portion engaging portion 4 e of the fixing member 4. The neck receiving part 4f is a space having a width dimension that is larger than the width dimension of the neck part 5b of the chip attachment member 5 to be described later and smaller than the width dimension of the fixed part engaging part 4e. In the present embodiment, the neck receiving portion 4f is a cylindrical space. On the outer peripheral surface of the fixing member 4, a neck portion entry port 4 b communicating with the neck portion receiving portion 4 f is formed. The inner diameter of the neck receiving part 4f is smaller than the inner diameter of the fixed part engaging part 4e. Therefore, a step surface 4g is formed at the boundary between the fixed portion engaging portion 4e and the neck portion receiving portion 4f. An anti-slip processing portion 4d formed by knurling or the like is formed on the upper portion of the fixing member 4.

図２に示されるように、本実施形態のコンタクトチップ２は、チップ取付部材５、交換チップ７とから構成されている。チップ取付部材５、交換チップ７は、強靱で導電性に優れたベリリウム銅やクロム銅等の銅合金で構成されている。 As shown in FIG. 2, the contact chip 2 of this embodiment is composed of a chip mounting member 5 and an exchange chip 7. The chip mounting member 5 and the replacement chip 7 are made of a copper alloy such as beryllium copper or chromium copper which is tough and excellent in conductivity.

チップ取付部材５は、図２や図３の（Ａ）、（Ｂ）に示されるように、略円柱形状である。チップ取付部材５の上端から下端に、固定部５ａ、首部５ｂ、取付部５ｃが一体に形成されている。言い換えると、固定部５ａは、チップ取付部材５の上端に突設されている。固定部５ａは略円柱形状である。固定部５ａの上端には、チップ取付部材５の長手方向（軸方向）と直交する面である受電面５ｇが形成されている。固定部５ａの外周面には、面取除去加工により形成された面取面５ｄが形成されている。面取面５ｄは、固定部５ａの外周面に２つ形成され、２つの面取面５ｄは互いに平行な面となっている。図３の（Ａ）に示されるように、２つの面取面５ｄ間の寸法ｂは、固定部材４の固定部侵入口４ａの開口部の幅寸法ａよりも小さくなっている。また、固定部５ａの長さ寸法は、固定部材４の固定部侵入口４ａの開口部の長さ寸法よりも小さくなっている。このため、図３の（Ｃ）に示されるように、チップ取付部材５の固定部５ａは固定部材４の固定部侵入口４ａに侵入可能となっている。図３の（Ｂ）に示されるように、固定部５ａの面取面５ｄが形成されていない部分の幅寸法ｃは、固定部材４の固定部侵入口４ａの開口部の幅寸法ａよりも大きくなっている。なお、固定部係合部４ｅの内径は、固定部５ａの面取面５ｄが形成されていない部分の幅寸法ｃよりも僅かに大きくなっている。固定部５ａの下側は、固定部５ａの幅寸法よりも小さい首部５ｂとなっている。首部５ｂの寸法は、固定部材４の首部侵入口４ｂの幅寸法よりも小さくなっているので、首部５ｂは首部侵入口４ｂに侵入可能となっている。取付部５ｃの内周面には、ネジ溝が螺刻されてチップ取付部材５ｅが形成されている。チップ取付部材５上部の軸心には偏心部材取付穴５ｈが形成されている。チップ取付部材５の偏心部材取付穴５ｈの下側には、偏心部材取付穴５ｈと連通し、チップ取付部材５の下端に開放するチップ取付ネジ穴５ｅが螺刻されている。チップ取付部材５の下端には、チップ取付部材５の長手方向（軸方向）と直交する面である給電面５ｆが形成されている。 As shown in FIGS. 2 and 3 (A) and (B), the chip mounting member 5 has a substantially cylindrical shape. From the upper end to the lower end of the chip attachment member 5, a fixed portion 5a, a neck portion 5b, and an attachment portion 5c are integrally formed. In other words, the fixing portion 5 a is projected from the upper end of the chip mounting member 5. The fixed part 5a has a substantially cylindrical shape. On the upper end of the fixed portion 5a, a power receiving surface 5g which is a surface orthogonal to the longitudinal direction (axial direction) of the chip mounting member 5 is formed. A chamfered surface 5d formed by chamfering removal processing is formed on the outer peripheral surface of the fixed portion 5a. Two chamfered surfaces 5d are formed on the outer peripheral surface of the fixed portion 5a, and the two chamfered surfaces 5d are parallel to each other. As shown in FIG. 3A, the dimension b between the two chamfered surfaces 5 d is smaller than the width dimension a of the opening of the fixing part entry port 4 a of the fixing member 4. Further, the length dimension of the fixing portion 5 a is smaller than the length dimension of the opening portion of the fixing portion entry port 4 a of the fixing member 4. For this reason, as shown in FIG. 3C, the fixing portion 5 a of the chip mounting member 5 can enter the fixing portion entry port 4 a of the fixing member 4. As shown in FIG. 3B, the width c of the portion of the fixing portion 5 a where the chamfered surface 5 d is not formed is larger than the width dimension a of the opening of the fixing portion entrance 4 a of the fixing member 4. It is getting bigger. The inner diameter of the fixed portion engaging portion 4e is slightly larger than the width dimension c of the portion where the chamfered surface 5d of the fixed portion 5a is not formed. The lower side of the fixed portion 5a is a neck portion 5b smaller than the width dimension of the fixed portion 5a. Since the size of the neck portion 5b is smaller than the width size of the neck portion entry port 4b of the fixing member 4, the neck portion 5b can enter the neck portion entry port 4b. On the inner peripheral surface of the mounting portion 5c, a screw groove is threaded to form a chip mounting member 5e. An eccentric member mounting hole 5h is formed in the shaft center of the upper portion of the chip mounting member 5. Below the eccentric member mounting hole 5 h of the chip mounting member 5, a chip mounting screw hole 5 e that communicates with the eccentric member mounting hole 5 h and opens at the lower end of the chip mounting member 5 is threaded. At the lower end of the chip mounting member 5, a power feeding surface 5f that is a surface orthogonal to the longitudinal direction (axial direction) of the chip mounting member 5 is formed.

偏心部材６は、筒状の取付部６ａと、この取付部６ａから下方に伸びる偏心部６ｂとから構成されている。本実施形態では、偏心部６ｂは円管の途中部分若しくは先端部分を曲げたものである。図３の（Ａ）や（Ｂ）に示されるように、取付部６ａがチップ取付部材５の偏心部材取付穴５ｈに挿通されて取り付けられ、偏心部材６がチップ取付部材５（コンタクトチップ２）内に取り付けられている。 The eccentric member 6 includes a cylindrical attachment portion 6a and an eccentric portion 6b extending downward from the attachment portion 6a. In the present embodiment, the eccentric portion 6b is obtained by bending the middle portion or the tip portion of the circular tube. As shown in FIGS. 3A and 3B, the mounting portion 6a is inserted through and attached to the eccentric member mounting hole 5h of the chip mounting member 5, and the eccentric member 6 is connected to the chip mounting member 5 (contact chip 2). Installed inside.

交換チップ７は、先細り形状の略砲弾形状となっていて、上端に取付部７ａが形成されている。取付部７ａには、チップ取付部材５のチップ取付ネジ穴５ｅと螺合するネジ山が螺刻されている。交換チップ７の軸心には、ワイヤ挿通穴７ｂが連通形成されている。ワイヤ挿通穴７ｂの下側は、ワイヤ接触部７ｄとなっている。ワイヤ挿通穴７ｂ（ワイヤ接触部７ｄ）の上側は、幅広部７ｃとなっている。ワイヤ接触部７ｄの内径は、挿通するソリッドワイヤ９９（以下単にワイヤ９９と略す）の外径よりも僅かに大きくなっていて、このワイヤ接触部７ｄにワイヤ９９が接触して、ワイヤ９９に溶接電流が給電されるようになっている。幅広部７ｃの内径は、ワイヤ接触部７ｄの内径よりも大きくなっている。また、幅広部７ｃの内径は、偏心部材６の偏心部６ｂの幅寸法よりも大きくなっていて、偏心部６ｂが幅広部７ｃ内に侵入可能となっている。取付部７ａの基端には、交換チップ７の長手方向（軸方向）と直交する平面である受電面７ｅが形成されている。 The replacement chip 7 has a tapered and substantially bullet-like shape, and an attachment portion 7a is formed at the upper end. The mounting portion 7a is threaded with a thread that is screwed into the chip mounting screw hole 5e of the chip mounting member 5. A wire insertion hole 7 b is formed in communication with the shaft center of the replacement chip 7. The lower side of the wire insertion hole 7b is a wire contact portion 7d. The upper side of the wire insertion hole 7b (wire contact portion 7d) is a wide portion 7c. The inner diameter of the wire contact portion 7d is slightly larger than the outer diameter of the solid wire 99 to be inserted (hereinafter simply referred to as the wire 99). The wire 99 comes into contact with the wire contact portion 7d and is welded to the wire 99. Current is supplied. The inner diameter of the wide portion 7c is larger than the inner diameter of the wire contact portion 7d. Moreover, the internal diameter of the wide part 7c is larger than the width dimension of the eccentric part 6b of the eccentric member 6, and the eccentric part 6b can penetrate | invade in the wide part 7c. A power receiving surface 7e that is a plane orthogonal to the longitudinal direction (axial direction) of the replacement chip 7 is formed at the base end of the mounting portion 7a.

次に、給電部１０の組み立て手順について説明する。まず、図３の（Ｃ）に示されるように、チップ取付部材５の固定部５ａを固定部材４の固定部侵入口４ａから固定部係合部４ｅに侵入させるとともに、首部５ｂを首部侵入口４ｂから首部受容部４ｆに受容させる。次に、図３の（Ｄ）に示されるように、チップ取付部材５を、固定部材４に対して回転させると、面取面５ｄが形成されていない部分の固定部５ａの幅寸法ｃは、固定部材４の固定部侵入口４ａの開口部の幅寸法ａよりも大きくなっているので、固定部５ａが固定部係合部４ｅに係合し、チップ取付部材５が固定部材４から脱落しない。この状態（図３の（Ｄ）に示される状態）で、固定部材４の雌ネジ部４ｃを、チップホルダ本体３の雄ネジ部３ｂに完全に螺合させて、固定部材４をチップホルダ本体３に締め付ける。すると、図１に示されるように、チップホルダ本体３の給電部３ｃと、チップ取付部材５の受電部５ｇとが密接して、チップホルダ本体３からチップ取付部材５へ導電可能な状態となる。固定部係合部４ｅに係合された固定部５ａは、固定部係合部４ｅと首部受容部４ｆの境界に形成された段差面４ｇにより確実に押圧されるので、確実に受電面５ｇと給電面３ｃとが密接する。この状態で、交換チップ７の取付部７ａをチップ取付部材５のチップ取付ネジ穴５ｅに完全に螺合させて、交換チップ７をチップ取付部材５に取り付けて、組み立てが完了する。この状態では、チップ取付部材５の給電部５ｆと、交換チップ７の受電部７ｅとが密接して、チップ取付部材５から交換チップ７へ導電可能な状態となる。また、この状態では、偏心部材６の偏心部６ｂが、交換チップ７のワイヤ挿通穴７ｂの幅広部７ｃへ挿通した状態となっている。この状態では、偏心部６ｂは、交換チップ７（ワイヤ挿通穴７ｂ）の軸心から偏心している。 Next, an assembly procedure of the power feeding unit 10 will be described. First, as shown in FIG. 3C, the fixing portion 5a of the chip mounting member 5 is made to enter the fixing portion engaging portion 4e from the fixing portion entry port 4a of the fixing member 4, and the neck portion 5b is made to enter the neck portion entry port. 4b is received by the neck receiving part 4f. Next, as shown in FIG. 3D, when the chip mounting member 5 is rotated with respect to the fixing member 4, the width dimension c of the fixing portion 5a where the chamfered surface 5d is not formed is Since the width a of the opening of the fixed portion entry port 4a of the fixed member 4 is larger than the width dimension a, the fixed portion 5a is engaged with the fixed portion engaging portion 4e, and the chip mounting member 5 is detached from the fixed member 4. do not do. In this state (the state shown in FIG. 3D), the female screw portion 4c of the fixing member 4 is completely screwed into the male screw portion 3b of the chip holder main body 3, and the fixing member 4 is inserted into the chip holder main body. Tighten to 3. Then, as shown in FIG. 1, the power feeding portion 3 c of the chip holder main body 3 and the power receiving portion 5 g of the chip mounting member 5 are brought into close contact with each other and can conduct electricity from the chip holder main body 3 to the chip mounting member 5. . The fixing portion 5a engaged with the fixing portion engaging portion 4e is surely pressed by the step surface 4g formed at the boundary between the fixing portion engaging portion 4e and the neck portion receiving portion 4f. The power supply surface 3c is in close contact. In this state, the mounting portion 7a of the replacement chip 7 is completely screwed into the chip mounting screw hole 5e of the chip mounting member 5, and the replacement chip 7 is mounted to the chip mounting member 5 to complete the assembly. In this state, the power feeding unit 5f of the chip mounting member 5 and the power receiving unit 7e of the replacement chip 7 are in close contact with each other, and the chip mounting member 5 can conduct electricity to the replacement chip 7. In this state, the eccentric portion 6 b of the eccentric member 6 is inserted into the wide portion 7 c of the wire insertion hole 7 b of the replacement chip 7. In this state, the eccentric portion 6b is eccentric from the axis of the exchange tip 7 (wire insertion hole 7b).

チップホルダ本体３から、交換チップ７のワイヤ挿通穴７ｂにワイヤ９９を挿通させると、図１に示されるように、偏心部材６の偏心部６ｂを挿通するワイヤ９９がワイヤ挿通穴７ｂの軸心に対して偏心する。このため、ワイヤ９９はワイヤ挿通穴７ｄに対して偏心して送給され、ワイヤ９９はワイヤ接触部７ｄに確実に接触する。このため、ワイヤ９９のワイヤ接触部７ｄへの接触不良の起因する溶接不良を防止することが可能となる。また、ワイヤ９９との摩擦により、ワイヤ挿通穴７ｂの接触部７ｂが摩耗して、穴の形状が拡がった場合であっても、ワイヤ９９は、偏心部６ｂによりワイヤ挿通穴７ｂの軸心に対して偏心して送給されるので、ワイヤ９９がワイヤ挿通穴７ｂのワイヤ接触部７ｄに確実に接触する。 When the wire 99 is inserted from the tip holder body 3 into the wire insertion hole 7b of the replacement tip 7, as shown in FIG. 1, the wire 99 inserted through the eccentric portion 6b of the eccentric member 6 is the axis of the wire insertion hole 7b. Eccentric. For this reason, the wire 99 is eccentrically fed with respect to the wire insertion hole 7d, and the wire 99 reliably contacts the wire contact portion 7d. For this reason, it becomes possible to prevent the welding failure resulting from the contact failure of the wire 99 to the wire contact portion 7d. Further, even when the contact portion 7b of the wire insertion hole 7b is worn due to friction with the wire 99 and the shape of the hole is expanded, the wire 99 is centered on the axis of the wire insertion hole 7b by the eccentric portion 6b. On the other hand, since the wire 99 is eccentrically fed, the wire 99 reliably contacts the wire contact portion 7d of the wire insertion hole 7b.

固定部材４をチップホルダ本体３に対して緩める方向に回転させると、チップホルダ本体３の給電部３ｃがチップ取付部材５の受電部５ｇから離間し、チップ取付部材５がチップホルダ本体３に対して回転自在な状態となる。チップ取付部材５を回転させたうえ固定部材４をチップホルダ本体３に締め付けると、チップ取付部材５に取り付けられている偏心部材６の偏心部６ｂの偏心方向が変化する。ユーザは、チップ取付部材５を回転させて、偏心部６ｂの偏心方向を所望の方向に偏心させることにより、ガスシールドアーク溶接用トーチの移動方向にワイヤ９９が曲がるように調整して、ワイヤ９９の狙い位置ズレを抑止することが可能となる。なお、本実施形態では、固定部材４の外周面に滑り止め加工部４ｄが形成されているので、ユーザは容易に固定部材４を緩める方向に回転させることができる。なお、本実施形態では、コンタクトチップ２を、チップ取付部材５と交換チップ７の２体構造としたので、ワイヤ挿通穴７ｂのワイヤ接触部７ｄが摩耗した場合であっても、交換チップ７のみを交換すればいいので、ランニングコストを低減させることが可能となる。 When the fixing member 4 is rotated in a loosening direction with respect to the chip holder main body 3, the power feeding part 3 c of the chip holder main body 3 is separated from the power receiving part 5 g of the chip mounting member 5, and the chip mounting member 5 is separated from the chip holder main body 3. And can be rotated freely. When the tip attachment member 5 is rotated and the fixing member 4 is fastened to the tip holder main body 3, the eccentric direction of the eccentric portion 6b of the eccentric member 6 attached to the tip attachment member 5 changes. The user adjusts the wire 99 to bend in the moving direction of the gas shield arc welding torch by rotating the tip mounting member 5 and decentering the eccentric direction of the eccentric portion 6b in a desired direction. It is possible to suppress the deviation of the target position. In the present embodiment, since the anti-slip portion 4d is formed on the outer peripheral surface of the fixing member 4, the user can easily rotate the fixing member 4 in the loosening direction. In this embodiment, since the contact chip 2 has a two-body structure including the chip mounting member 5 and the replacement chip 7, only the replacement chip 7 is obtained even when the wire contact portion 7d of the wire insertion hole 7b is worn. Therefore, running costs can be reduced.

以上説明した実施形態では、コンタクトチップ２は、チップ取付部材５と交換チップ７とからなる２体構造であるが、図４に示されるように、一体構造のコンタクトチップ１２であっても差し支えない。このコンタクトチップ１２には、基端から先端にかけて軸心を連通するワイヤ挿通穴１２ａが連通形成されている。コンタクトチップ１２先端側のワイヤ挿通穴１２ａは、ワイヤ接触部１２ｂとなっていて、コンタクトチップ１２基端側のワイヤ挿通穴１２ａは、ワイヤ接触部１２ｂよりも幅広（内径が大きい）幅広部１２ｃとなっている。偏心部６ｂの先端がコンタクトチップ１２の先端側に向いた状態で、偏心部６ｂが幅広部１２ｃ内に挿通し、取付部６ａが幅広部１２ｃと嵌合して、偏心部材６がコンタクトチップ１２内に取り付けられている。 In the embodiment described above, the contact chip 2 has a two-body structure including the chip mounting member 5 and the replacement chip 7, but as shown in FIG. 4, the contact chip 2 may be an integrated contact chip 12. . The contact tip 12 is formed with a wire insertion hole 12a that communicates the shaft center from the proximal end to the distal end. The wire insertion hole 12a on the distal end side of the contact chip 12 is a wire contact portion 12b, and the wire insertion hole 12a on the proximal end side of the contact chip 12 is wider than the wire contact portion 12b (the inner diameter is larger) and a wide portion 12c. It has become. With the tip of the eccentric portion 6b facing the tip side of the contact chip 12, the eccentric portion 6b is inserted into the wide portion 12c, the mounting portion 6a is fitted with the wide portion 12c, and the eccentric member 6 is contact tip 12. Installed inside.

以上説明した実施形態では、偏心部材６の偏心部６ｂは円管が曲げられて形成されたものであるが、四角管等の管状の部材が曲げられた偏心部、或いは、先端若しくは途中部分が曲げられた板状の偏心部であっても差し支えない。 In the embodiment described above, the eccentric portion 6b of the eccentric member 6 is formed by bending a circular tube, but the eccentric portion where the tubular member such as a square tube is bent, or the tip or the middle portion is formed. Even a bent plate-shaped eccentric part may be used.

以上、現時点において、もっとも、実践的であり、かつ好ましいと思われる実施形態に関連して本発明を説明したが、本発明は、本願明細書中に開示された実施形態に限定されるものではなく、請求の範囲および明細書全体から読み取れる発明の要旨あるいは思想に反しない範囲で適宜変更可能であり、そのような変更を伴うガスシールドアーク溶接用トーチの給電部もまた技術的範囲に包含されるものとして理解されなければならない。 Although the present invention has been described above in connection with the most practical and preferred embodiments at the present time, the present invention is not limited to the embodiments disclosed herein. The power supply part of the gas shielded arc welding torch with such a change is also included in the technical scope without departing from the spirit or concept of the invention that can be read from the claims and the entire specification. Must be understood.

１チップホルダ
２コンタクトチップ
３チップホルダ本体
３ａノズルホルダ取付部
３ｂ雄ネジ部
３ｃ給電面
３ｄガス供給口
４固定部材
４ａ固定部侵入口
４ｂ挿通口
４ｃ雌ネジ部
４ｄ滑り止め加工部
４ｅ固定部係合部
４ｆ首部受容部
４ｇ段差面
５チップ取付部材
５ａ固定部
５ｂ首部
５ｃ取付部
５ｄ面取面
５ｅチップ取付ネジ穴
５ｆ給電面
５ｇ受電面
５ｈ偏心部材取付穴
６偏心部材
６ａ取付部
６ｂ偏心部
７交換チップ
７ａ取付部
７ｂワイヤ挿通穴
７ｃ幅広部
７ｄワイヤ接触部
７ｅ受電面
１０ガスシールドアーク溶接用トーチの給電部
１２コンタクトチップ（別例）
１２ａワイヤ挿通穴
１２ｂワイヤ接触部
１２ｃ幅広部
５０ガスシールドアーク溶接用トーチ
５１チップホルダ
５１ａガス供給口
５２シールドノズル
５３ノズルホルダ
５５コンタクトチップ
５５ａワイヤ挿通穴
９９ソリッドワイヤ DESCRIPTION OF SYMBOLS 1 Tip holder 2 Contact tip 3 Tip holder main body 3a Nozzle holder attaching part 3b Male screw part 3c Power supply surface 3d Gas supply port 4 Fixing member 4a Fixing part intrusion port 4b Insertion port 4c Female screw part 4d Non-slip processing part 4e Fixing part engagement Joint portion 4f Neck receiving portion 4g Stepped surface 5 Tip mounting member 5a Fixing portion 5b Neck portion 5c Mounting portion 5d Chamfered surface 5e Tip mounting screw hole 5f Power feeding surface 5g Power receiving surface 5h Eccentric member mounting hole 6 Eccentric member 6a Mounting portion 6b Eccentric portion 7 exchange tip 7a mounting portion 7b wire insertion hole 7c wide portion 7d wire contact portion 7e power receiving surface 10 power supply portion of gas shield arc welding torch 12 contact tip (another example)
12a Wire insertion hole 12b Wire contact portion 12c Wide portion 50 Gas shield arc welding torch 51 Tip holder 51a Gas supply port 52 Shield nozzle 53 Nozzle holder 55 Contact tip 55a Wire insertion hole 99 Solid wire

Claims

In the power supply part of the gas shield arc welding torch for inserting a solid wire and supplying a welding current to the solid wire,
A cylindrical chip holder body in which a male screw part is formed at the lower end and a power feeding surface is formed at the lower end,
A fixed portion having a power receiving surface formed at the upper end protrudes from the upper end, and a wire insertion hole comprising a wire contact portion and a wider portion wider than the wire contact portion is formed in communication with the shaft center in order from the lower end to the upper end. Contact chips,
An eccentric member that is inserted through the wide portion and has an eccentric portion that is eccentric from the axis, and is attached to the inside of the contact chip;
The upper inner peripheral surface has a female screw portion that is screwed with the male screw portion, and a fixing member that has a fixing portion engaging portion having a shape corresponding to the fixing portion below the female screw portion. And
In a state where the fixing portion is engaged with the fixing portion engaging portion, the fixing member is fastened to the chip holder body by screwing the female screw portion into the male screw portion, and the power receiving surface A power supply part of a gas shield arc welding torch, wherein the contact tip is attached to the tip holder body in a state of being in close contact with the power supply surface.

The feeding part of the gas shielded arc welding torch according to claim 1, wherein the eccentric part is a bent tube.

A neck part having a smaller width than the fixed part is formed below the fixed part of the contact chip,
Below the fixing part engaging part of the fixing member is a space having a width dimension larger than the width dimension of the neck part and smaller than the width dimension of the fixing part engaging part, and receiving the neck part opening at the lower end of the fixing member Part is formed,
On the outer peripheral surface of the fixing member, there are formed a fixed portion entry port communicating with the fixed portion engaging portion, and a neck portion entry port communicating with the neck receiving portion,
Two parallel chamfered surfaces are formed on the outer peripheral surface of the fixed portion of the contact chip,
The dimension between the two chamfered surfaces is smaller than the width dimension of the fixed portion entrance,
The width dimension of the fixed part where the chamfered surface is not formed is larger than the width dimension of the fixed part entry port,
The width of the neck is configured to be smaller than the width of the neck entry hole,
2. The contact tip is fixed to a fixing member while the fixing portion is engaged with the fixing portion engaging portion, the neck portion is received by the neck receiving portion. The power feeding part of the torch for gas shielded arc welding according to 2.

Contact tip
A chip mounting member formed with a fixing portion and fixed to the fixing member;
The gas shielded arc welding according to any one of claims 1 to 3, wherein the gas shielded arc welding is composed of an exchange tip attached to the tip attachment member and having a contact portion of a wire insertion hole formed at a tip thereof. Torch power supply unit.