JP5986388B2 - Spot welding equipment - Google Patents

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JP5986388B2
JP5986388B2 JP2012022657A JP2012022657A JP5986388B2 JP 5986388 B2 JP5986388 B2 JP 5986388B2 JP 2012022657 A JP2012022657 A JP 2012022657A JP 2012022657 A JP2012022657 A JP 2012022657A JP 5986388 B2 JP5986388 B2 JP 5986388B2
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坂本　登
登 坂本
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Subaru Corp
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Fuji Jukogyo KK
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Description

本発明は、板材を重ね合わせた板組みの被溶接部材をスポット溶接するスポット溶接装置に関する。   The present invention relates to a spot welding apparatus for spot welding a member to be welded in a plate assembly in which plate materials are overlapped.

一般に、重ね合わされた鋼板等の板材の接合には、一対の溶接電極間で挟み加圧力を与えて両電極間に大電流を通電するスポット溶接が広く行われている。   In general, spot welding in which a large current is applied between both electrodes by applying a sandwiching pressure between a pair of welding electrodes to widely join plate materials such as stacked steel plates is widely performed.

スポット溶接にあたり、両溶接電極による加圧力及び通電時間が一定の場合には、ナゲット径は電流の増加に従って徐々に増加するが、電流値が過大になると発熱量が多くなり板材間に溶融金属が飛散する散りの発生原因となる。即ち、接合部における板厚の減少と共に強度低下の要因となる。反対に電流が過少の場合にはナゲットが小さくなり十分な接合強度が得られない。また、加圧力が小さいと板材間の接触面積が少なくなり、電流密度が高くなり過熱による散り発生原因となる。一方、加圧力が大き過ぎると接合部の接触面積が大きくなり電流密度が低下して発熱量が減少し、ナゲットが小さくなり溶接強度が低下する。   In spot welding, when the applied pressure and energization time by both welding electrodes are constant, the nugget diameter gradually increases as the current increases, but if the current value is excessive, the amount of heat generation increases and molten metal is present between the plate materials. Causes scattering. That is, it causes a reduction in strength as the plate thickness decreases at the joint. On the other hand, when the current is too small, the nugget becomes small and sufficient bonding strength cannot be obtained. In addition, when the applied pressure is small, the contact area between the plate materials is reduced, the current density is increased, and scattering due to overheating is caused. On the other hand, if the applied pressure is too large, the contact area of the joint is increased, the current density is reduced, the heat generation is reduced, the nugget is reduced, and the welding strength is reduced.

ここで、図８に示すように、剛性の低い薄板１０１、この薄板１０１より剛性が高い第１厚板１０２及び第２厚板１０３の３枚を重ね合わせた被溶接部材１００をスポット溶接する場合には、各板材１０１、１０２、１０３の間に隙間がなく密着した状態では、可動側電極１１１と固定側電極１１２により被溶接部材１００を加圧して電源１１３により通電すると、可動側電極１１１と固定側電極１１２との間の通電経路における電流密度がほぼ均一となり薄板１０１から第２厚板１０３に亘って良好なナゲットが形成されて溶接強度を得ることができる。   Here, as shown in FIG. 8, spot welding is performed on a member to be welded 100 in which three sheets of a thin plate 101 having low rigidity and a first thick plate 102 and a second thick plate 103 having higher rigidity than the thin plate 101 are overlapped. In the state where the plate members 101, 102, and 103 are in close contact with each other, when the member to be welded 100 is pressed by the movable side electrode 111 and the fixed side electrode 112 and energized by the power source 113, the movable side electrode 111 and The current density in the energization path between the stationary electrode 112 and the fixed side electrode 112 is substantially uniform, and a good nugget is formed from the thin plate 101 to the second thick plate 103, so that welding strength can be obtained.

しかし、実際には、可動側電極１１１と固定側電極１１２によって被溶接部材１００を加圧したときに、剛性の低い薄板１０１と第１厚板１０２が上方に撓んで、薄板１０１と第１厚板１０２の間及び第１厚板１０２と第２厚板１０３との間に隙間が生じる。この場合、可動側電極１１１と薄板１０１間の接触面積は薄板１０１の撓みにより大きくなるのに対して、薄板１０１と第１厚板１０２間及び第１厚板１０２と第２厚板１０３間の接合部の接触面積はより小さくなる。   However, actually, when the member to be welded 100 is pressed by the movable side electrode 111 and the fixed side electrode 112, the thin plate 101 and the first thick plate 102 having low rigidity bend upward, and the thin plate 101 and the first thickness are bent. A gap is generated between the plates 102 and between the first thick plate 102 and the second thick plate 103. In this case, the contact area between the movable electrode 111 and the thin plate 101 is increased by the bending of the thin plate 101, whereas between the thin plate 101 and the first thick plate 102 and between the first thick plate 102 and the second thick plate 103. The contact area of the joint becomes smaller.

このため、可動側電極１１１と固定側電極１１２間の電流密度が薄板１０１側に対して第２厚板１０３側が高くなり、薄板１０１と第１厚板１０２間よりも第１厚板１０２と第２厚板１０３間の方が局部的な発熱量が多くなる。その結果、図８（ａ）に示すように、先ず第１厚板１０２と第２厚板１０３との接合部にナゲットＮが形成され、次第にナゲットＮが大きくなりやがて図８（ｂ）のように薄板１０１と第１厚板１０２間が溶着される。しかし、この薄板１０１と第１厚板１０２との間の溶け込み量は小さく溶接強度が不安定で、薄板１０１の剥離が懸念され、かつ溶接品質にバラツキがある。この不具合は、特に第１厚板１０２及び第２厚板１０３が厚いほど第１厚板１０２と薄板１０１との間にナゲットＮが到達しにくく、顕著である。   For this reason, the current density between the movable side electrode 111 and the fixed side electrode 112 is higher on the second thick plate 103 side than on the thin plate 101 side, and the first thick plate 102 and the first thick plate 102 are larger than between the thin plate 101 and the first thick plate 102. The amount of heat generated locally between the two thick plates 103 increases. As a result, as shown in FIG. 8A, first, a nugget N is formed at the joint between the first thick plate 102 and the second thick plate 103, and then the nugget N gradually increases as shown in FIG. 8B. The thin plate 101 and the first thick plate 102 are welded together. However, the amount of penetration between the thin plate 101 and the first thick plate 102 is small, the welding strength is unstable, the peeling of the thin plate 101 is a concern, and the welding quality varies. This problem is particularly noticeable because the nugget N is less likely to reach between the first thick plate 102 and the thin plate 101 as the first thick plate 102 and the second thick plate 103 are thicker.

この対策として、例えば特許文献１に開示されたスポット溶接装置がある、このスポット溶接装置は、図９に示すように、溶接ロボット１１５の手首部１１６にスポット溶接装置１２０が搭載され、溶接ロボット１１５は、クランパ１１８によって支持された被溶接部材１００の各打点位置にスポット溶接ガン１２０を移動し、被溶接部材１００のスポット溶接を行う。   As a countermeasure, for example, there is a spot welding apparatus disclosed in Patent Document 1. In this spot welding apparatus, a spot welding apparatus 120 is mounted on a wrist 116 of a welding robot 115 as shown in FIG. Moves the spot welding gun 120 to each spot position of the member to be welded 100 supported by the clamper 118 to perform spot welding of the member to be welded 100.

スポット溶接装置１２０は、手首部１１６に取り付けられたガン支持ブラケット１１７に固定されたリニアガイド１２１によって上下動自在に支持されたベース部１２２を備え、ベース部１２２に下方に延びる固定アーム１２３が設けられ、固定アーム１２３の下端先端に固定側電極１２４が設けられる。また、ベース部１２２の上端に加圧アクチュエータ１２６が搭載され、加圧アクチュエータ１２６により上下動するロッド１２７の下端に可動側電極１２５が取り付けられる。ガン支持ブラケット１１７の上端にサーボモータ１２８が搭載され、サーボモータ１２８の作動によりボールねじ機構を介してベース部１２２が上下動する。   The spot welding device 120 includes a base portion 122 supported by a linear guide 121 fixed to a gun support bracket 117 attached to the wrist portion 116 so as to be movable up and down, and a fixed arm 123 extending downward is provided on the base portion 122. The fixed side electrode 124 is provided at the lower end tip of the fixed arm 123. A pressure actuator 126 is mounted on the upper end of the base portion 122, and the movable electrode 125 is attached to the lower end of the rod 127 that moves up and down by the pressure actuator 126. A servo motor 128 is mounted on the upper end of the gun support bracket 117, and the operation of the servo motor 128 causes the base portion 122 to move up and down via a ball screw mechanism.

ここで、図示しないコントローラに予め記憶されているティーチングデータに従って、薄板１０１側に位置する可動側電極１２５による加圧力ＦＵを固定側電極１２４による加圧力ＦＬよりも小さくする（ＦＵ＜ＦＬ）。   Here, in accordance with teaching data stored in advance in a controller (not shown), the pressure FU applied by the movable electrode 125 located on the thin plate 101 side is made smaller than the pressure FL applied by the fixed electrode 124 (FU <FL).

このように可動側電極１２５による加圧力ＦＵを固定側電極１２４による加圧力ＦＬより小さくするために、先ず、サーボモータ１２８によりベース部１２２を上昇させて固定側電極１２４を被溶接部材１００の下面に当接させると共に、加圧アクチュエータ１２６により可動側電極１２５を下降させて被溶接部材１００の上面に当接させて加圧する。次に、サーボモータ１２８によりベース部１２２を押し上げる。このベース部１２２の押し上げにより、固定側電極１２４の加圧力ＦＬがベース部１２２の押し上げ分だけ増加し、可動側電極１２５による加圧力ＦＵが固定側電極１２４による加圧力ＦＬより小さくなる。   In order to make the pressure FU applied by the movable electrode 125 smaller than the pressure FL applied by the fixed electrode 124 in this way, first, the base portion 122 is raised by the servo motor 128 to connect the fixed electrode 124 to the lower surface of the member 100 to be welded. The movable side electrode 125 is lowered by the pressure actuator 126 and is brought into contact with the upper surface of the member to be welded 100 for pressurization. Next, the base portion 122 is pushed up by the servo motor 128. As the base portion 122 is pushed up, the pressing force FL of the fixed side electrode 124 is increased by the pushing amount of the base portion 122, and the pressing force FU by the movable side electrode 125 becomes smaller than the pressing force FL by the fixed side electrode 124.

その結果、可動側電極１２５と固定側電極１２４との間に通電したときに、薄板１０１と第１厚板１０２の接合部における電流密度が高くなり発熱量が第１厚板１０２と第２厚板１０３の接合部における発熱量に対して相対的に増加する。これにより、薄板１０１から第２厚板１０３に亘って偏りのない良好なナゲットが生成されて溶接強度を確保できる。   As a result, when the movable side electrode 125 and the fixed side electrode 124 are energized, the current density at the joint between the thin plate 101 and the first thick plate 102 is increased, and the amount of heat generated is the first thick plate 102 and the second thickness. It increases relative to the amount of heat generated at the joint of the plate 103. Thereby, a good nugget with no bias is generated from the thin plate 101 to the second thick plate 103, and the welding strength can be ensured.

特開２００３−２５１４６９号公報JP 2003-251469 A

上記特許文献１によると、固定側電極１２４の加圧力ＦＬより可動側電極１２５側の加圧力ＦＵを小さくすることで、相対的に薄板１０１と第１厚板１０２間の電流密度が高くなり、薄板１０１と第１厚板１０２の接合部における発熱量が確保でき、溶け込み量が増大して溶接強度が増加する。   According to Patent Document 1, the current density between the thin plate 101 and the first thick plate 102 is relatively increased by making the applied pressure FU on the movable side electrode 125 side smaller than the applied pressure FL of the fixed side electrode 124. The amount of heat generated at the joint between the thin plate 101 and the first thick plate 102 can be secured, the amount of penetration increases, and the welding strength increases.

しかし、クランパ１１８によりクランプ保持された被溶接部材１００を固定側電極１２４と可動側電極１２５によって挟持加圧した状態でベース部１２２を移動して固定側電極１２４の加圧力ＦＬより可動側電極１２５による加圧力ＦＵを小さくするには、被溶接部材１００をクランプ保持するクランパ１１８に大きな負荷が要求される。一方、クランパ１１８による被溶接部材１００のクランプ位置と溶接位置が大きく離間した状態では、被溶接部材１００が撓み変形して固定側電極１２４による加圧力ＦＬと可動側電極１２５による加圧力ＦＵにバラツキが生じて安定した薄板１０１と第１厚板１０２との間の接触抵抗及び第１厚板１０２と第２厚板１０３との間の接触抵抗の確保が困難であり、接合部における電流密度にバラツキが生じてスポット溶接の品質低下が懸念される。   However, the member to be welded 100 clamped and held by the clamper 118 is moved between the fixed side electrode 124 and the movable side electrode 125 while the base part 122 is moved and the movable side electrode 125 is moved by the pressure FL of the fixed side electrode 124. In order to reduce the applied pressure FU caused by the above, a large load is required for the clamper 118 that clamps and holds the member to be welded 100. On the other hand, in the state where the clamp position of the member 100 to be welded by the clamper 118 and the welding position are largely separated from each other, the member 100 to be welded is bent and deformed, and the applied pressure FL by the fixed side electrode 124 and the applied pressure FU by the movable side electrode 125 vary. It is difficult to secure a stable contact resistance between the thin plate 101 and the first thick plate 102 and a contact resistance between the first thick plate 102 and the second thick plate 103 due to the occurrence of There is a concern that the quality of spot welding may deteriorate due to variations.

従って、かかる点に鑑みてなされた本発明の目的は、板材を重ね合わせた板組みの被溶接部材をスポット溶接するにあたり、優れた溶接品質が得られるスポット溶接装置を提供することにある。   Therefore, the objective of this invention made | formed in view of this point is providing the spot welding apparatus which can obtain the outstanding welding quality in carrying out the spot welding of the to-be-welded member of the board assembly which piled up the board | plate material.

上記目的を達成する請求項１に記載の発明によるスポット溶接装置は、第１溶接電極と、加圧アクチュエータの作動によって中心軸線に沿って該第１溶接電極と対向配置されて第１溶接電極から離反する退避位置と前記第１溶接電極と協働して被溶接部材を挟持して加圧する加圧位置とを移動する第２溶接電極と、副加圧アクチュエータによって前記中心軸線の延在方向と平行に移動するシャフトの先端に副加圧部が配置され、前記副加圧アクチュエータの作動により副加圧部が前記被溶接部材に前記第１溶接電極に隣接して当接して該被溶接部材に副加圧力を付与する副加圧位置及び被溶接部材から離反する退避位置に移動する副加圧付与手段とを備え、前記被溶接部材に当接する第１溶接電極及び副加圧位置における副加圧部と前記第１溶接電極に対向して前記被溶接部材に当接する第２溶接電極とによって前記被溶接部材を挟持加圧し、該挟持加圧状態で前記第１溶接電極と第２溶接電極との間で通電してスポット溶接するスポット溶接装置であって、
前記副加圧部をスポット作動領域から退避する後退位置に移動せしめる副加圧部移動機構を備えたことを特徴とする。 The spot welding apparatus according to the first aspect of the present invention that achieves the above object includes: a first welding electrode; and a first actuator electrode that is disposed so as to face the first welding electrode along a central axis by the operation of a pressure actuator. A second welding electrode that moves between a retreating position that separates and a pressing position that clamps and pressurizes the member to be welded in cooperation with the first welding electrode; and an extension direction of the central axis by a sub-pressurizing actuator A sub-pressurizing portion is disposed at the tip of the shaft that moves in parallel, and the sub-pressurizing portion abuts on the member to be welded adjacent to the first welding electrode by the operation of the sub-pressurizing actuator. A sub-pressurizing position for applying a sub-pressurizing force and a sub-pressurizing applying means for moving to a retracted position away from the member to be welded, and a first welding electrode that contacts the member to be welded and a sub-pressing position at the sub-pressurizing position. Pressurizing section and the first The member to be welded is sandwiched and pressed by a second welding electrode that faces the member to be welded and is in contact with the member to be welded, and electricity is passed between the first welding electrode and the second welding electrode in the sandwiched and pressurized state. Spot welding equipment for spot welding,
A sub-pressurizing unit moving mechanism is provided, which moves the sub-pressurizing unit to a retracted position for retracting from the spot operating region.

これによると、第１溶接電極及び第２溶接電極の協働による加圧力が被溶接部材に付与されると共に副加圧部からの副加圧力が被溶接部材に付与されて第１溶接電極による加圧力及び第２溶接電極による加圧力が制御されて板材を重ねた被溶接部材に対する優れた溶接品質が得られる。   According to this, the pressurizing force by the cooperation of the first welding electrode and the second welding electrode is applied to the member to be welded, and the auxiliary pressurizing force from the sub pressurizing portion is applied to the welded member and is applied by the first welding electrode. The welding pressure with respect to the to-be-welded member which piled up the plate material by controlling the pressing force and the pressing force by the second welding electrode is obtained.

一方、副加圧部移動機構によって副加圧部をスポット作動領域から後退させることで第１溶接電極及び第２溶接電極やスポット作動領域及びスポット作動領域の周辺の構成部品等のメンテナンス作業空間が確保できる。   On the other hand, the sub pressurization unit is moved backward from the spot operating region by the sub pressurizing unit moving mechanism, so that the maintenance work space for the first welding electrode, the second welding electrode, the component parts around the spot operating region and the spot operating region, etc. It can be secured.

また、副加圧部を後退位置に保持することで副加圧部を使用しない第１溶接電極と第２溶接電極によるスポット溶接が実行でき、要求に応じたスポット作業が行え、汎用性が得られる。   In addition, by holding the auxiliary pressure part in the retracted position, spot welding can be performed using the first welding electrode and the second welding electrode without using the auxiliary pressure part, spot work can be performed as required, and versatility is obtained. It is done.

請求項２に記載の発明は、請求項１のスポット溶接装置において、前記副加圧部移動機構は、前記副加圧アクチュエータにより前記副加圧部が移動する退避位置と副加圧位置との作動領域から移動した際に、前記副加圧部をスポット作動領域から退避する後退位置に移動せしめることを特徴とする。 Invention according to claim 2, in the spot welding apparatus according to claim 1, wherein the sub-pressurizing unit moving mechanism, retracted position and a secondary pressure that the auxiliary pressure Actuator said by error over data sub pressurizing moves When moving from the operating area with respect to the position, the sub-pressurizing unit is moved to a retracted position for retracting from the spot operating area.

請求項３に記載の発明は、請求項１または２のスポット溶接装置において、前記副加圧部移動機構は、前記副加圧アクチュエータによる前記シャフトの移動により前記副加圧部が移動する退避位置と副加圧位置との作動領域から移動した際に、前記副加圧部をスポット作動領域から退避する後退位置に移動せしめることを特徴とする。 The invention according to claim 3, in the spot welding apparatus according to claim 1 or 2, wherein the sub-pressurizing unit moving mechanism, said auxiliary pressing is moved by the movement of the shaft by the auxiliary pressure Actuator error over data When moving from the operating region of the retracted position and the sub-pressurizing position, the sub-pressurizing unit is moved to a retracted position for retracting from the spot operating region.

請求項４に記載の発明は、請求項３のスポット溶接装置において、前記副加圧部移動機構は、前記シャフトが貫通して内周に誘導ガイド溝を有するガイド部と、前記シャフトに設けられて前記誘導ガイド溝に移動可能に嵌合する被誘導部とを備え、前記副加圧アクチュエータによる前記シャフトの移動により前記ガイド部の誘導ガイド溝内を移動する前記被誘導部によって副加圧部が移動する退避位置と副加圧位置との作動領域から移動した際に前記シャフトに回動付与されて前記副加圧部がスポット作動領域から退避する後退位置に移動することを特徴とする。 According to a fourth aspect of the present invention, in the spot welding apparatus according to the third aspect, the sub-pressurizing portion moving mechanism is provided on the shaft, the guide portion having the guide guide groove on the inner periphery through the shaft, and the shaft. And a guided portion that movably fits in the guiding guide groove, and the sub-pressurizing portion is moved by the guided portion that moves in the guiding guide groove of the guide portion by the movement of the shaft by the sub-pressurizing actuator. There the auxiliary pressing is rotated imparted to the shaft upon movement from the working region of the retracted position and the auxiliary pressing position to be moved, characterized in that to move to a retracted position retracted from the spot working area.

請求項５に記載の発明は、請求項３のスポット溶接装置において、前記副加圧部移動機構は、前記シャフトに配置されて前記副加圧部を該シャフトの回動に連動して上記中心軸線に接離せしめる副加圧部突出機構と、前記シャフトが貫通して内周に誘導ガイド溝を有するガイド部と、前記シャフトに設けられて前記誘導ガイド溝に移動可能に嵌合する被誘導部とを備え、前記副加圧アクチュエータによる前記シャフトの移動により前記ガイド部の誘導ガイド溝内を移動する前記被誘導部によって副加圧部が移動する退避位置と副加圧位置との作動領域から移動した際に前記シャフトに回動付与され、副加圧部突出機構によって前記副加圧部がスポット作動領域から退避する後退位置に移動することを特徴とする。   According to a fifth aspect of the present invention, in the spot welding apparatus according to the third aspect, the sub-pressurizing portion moving mechanism is disposed on the shaft and moves the sub-pressurizing portion to the center in conjunction with the rotation of the shaft. A sub-pressurizing portion projecting mechanism that contacts and separates from the axis, a guide portion through which the shaft penetrates and having a guide guide groove on the inner periphery, and a guided body that is provided on the shaft and is movably fitted in the guide guide groove And an operating region between a retracted position and a sub-pressurizing position where the sub-pressurizing part moves by the guided part that moves in the guide guide groove of the guide part by movement of the shaft by the sub-pressurizing actuator When the shaft is moved from the position, the shaft is pivotally applied, and the sub-pressurizing portion moves to a retreat position where the sub-pressurizing portion is retracted from the spot operating region by the sub-pressurizing portion projecting mechanism.

請求項６に記載の発明は、請求項３のスポット溶接装置において、前記副加圧部移動機構は、前記シャフトの先端に回動自在に支持された副加圧付与アームの先端に副加圧部が揺動自在に支持され、前記シャフトに配置されて前記副加圧部を該シャフトの回動に連動して副加圧部を揺動せしめる副加圧部揺動機構と、前記シャフトが貫通して内周に誘導ガイド溝を有するガイド部と、前記シャフトに設けられて前記誘導ガイド溝に移動可能に嵌合する被誘導部とを備え、前記副加圧アクチュエータによる前記シャフトの移動により前記ガイド部の誘導ガイド溝内を移動する前記被誘導部によって副加圧部が移動する退避位置と副加圧位置との作動領域から移動した際に前記シャフトに回動付与され、副加圧部揺動機構によって前記副加圧部が揺動してスポット作動領域から退避する後退位置に移動することを特徴とする。 Invention according to claim 6, in the spot welding apparatus according to claim 3, wherein the sub-pressurizing unit moving mechanism FukuKa pressure at the tip of the auxiliary pressure imparted arm which is rotatably supported on a distal end of the shaft A sub-pressurizing unit swinging mechanism that is supported on the shaft and that is disposed on the shaft and swings the sub-pressurizing unit in conjunction with the rotation of the shaft; and the shaft A guide portion that penetrates and has a guide guide groove on an inner periphery thereof, and a guided portion that is provided on the shaft and is movably fitted in the guide guide groove, and is moved by the movement of the shaft by the auxiliary pressure actuator. The shaft is rotated and applied to the shaft when the sub-pressurization unit moves from the operating region between the retracted position and the sub-pressurization position where the sub-pressurization unit moves by the guided portion that moves in the guide guide groove of the guide unit. The sub-pressurizing part is Moving to thus being moved to a retracted position retracted from the spot working area.

請求項７に記載の発明は、請求項３のスポット溶接装置において、前記副加圧部移動機構は、前記シャフトに配置されて先端が上記中心軸線に接離する方向に移動自在に保持する副加圧部保持機構と、固定部材に形成されて副加圧部に設けられた被誘導部が移動可能に嵌合する誘導ガイド溝を備え、前記副加圧アクチュエータによる前記シャフトの移動により誘導ガイド溝内を移動する前記被誘導部によって副加圧部が移動する退避位置と副加圧位置との作動領域から移動した状態で副加圧部がスポット作動領域から退避する後退位置に移動することを特徴とする。   A seventh aspect of the present invention is the spot welding apparatus according to the third aspect, wherein the sub-pressurizing portion moving mechanism is disposed on the shaft and is movably held in a direction in which the tip is in contact with or separated from the central axis. A pressure guide holding mechanism, and a guide guide groove formed on the fixed member and provided in the sub-pressurizer so that the guided part is movably fitted, and the guide is guided by the movement of the shaft by the sub-pressurization actuator. The sub-pressurizing unit moves to the retreat position where the sub-pressurizing unit retreats from the spot operating region in a state where the sub-pressurizing unit moves from the operating region between the retreating position where the sub-pressurizing unit moves and the sub-pressurizing position by the guided portion moving in the groove. It is characterized by.

請求項８に記載の発明は、請求項３のスポット溶接装置において、前記副加圧部移動機構は、前記シャフトの先端に中央部が回動自在に支持され先端に副加圧部を支持すると共に後端が固定部材に回動自在に支持された副加圧付与アームを備え、前記副加圧アクチュエータによる前記シャフトの移動によって揺動移動する副加圧部が退避位置と副加圧位置との作動領域から移動した際に前記副加圧部がスポット作動領域から退避する後退位置に移動することを特徴とする。   An eighth aspect of the present invention is the spot welding apparatus according to the third aspect, wherein the sub-pressurizing portion moving mechanism is rotatably supported at the center portion at the tip end of the shaft and supports the sub-pressurizing portion at the tip end. And an auxiliary pressure applying arm whose rear end is rotatably supported by a fixed member, and an auxiliary pressure portion that swings and moves by movement of the shaft by the auxiliary pressure actuator includes a retracted position and an auxiliary pressure position. The sub-pressurizing unit moves to a retreat position where it is retracted from the spot operating region when moving from the operating region.

請求項９に記載の発明は、請求項１のスポット溶接装置において、前記副加圧部移動機構は、前記副加圧アクチュエータとは別のアクチュエータにより前記副加圧部をスポット作動領域から退避する後退位置に移動せしめることを特徴とする。 Invention according to claim 9, in the spot welding apparatus according to claim 1, wherein the sub-pressurizing unit moving mechanism, said auxiliary pressure Actuator error over data and spot actuation region the sub pressurizing with another actuator It moves to the retreat position which evacuates from.

これら請求項２〜９の発明は、請求項１における副加圧部移動機構の具体的構成を開示するものである。   The inventions according to claims 2 to 9 disclose specific configurations of the sub-pressurizing part moving mechanism according to claim 1.

本発明によると、第１溶接電極及び第２溶接電極の協働による加圧力が被溶接部材に付与されると共に副加圧部からの副加圧力が被溶接部材に付与されて第１溶接電極による加圧力及び第２溶接電極による加圧力が制御されて板材を重ねた被溶接部材に対する優れた溶接品質が得られる。   According to the present invention, the pressure applied by the cooperation of the first welding electrode and the second welding electrode is applied to the member to be welded, and the auxiliary pressure from the sub-pressurizing portion is applied to the member to be welded to thereby form the first welding electrode. The welding pressure by the second welding electrode and the welding pressure by the second welding electrode are controlled, and an excellent welding quality can be obtained for a member to be welded on which plate materials are stacked.

一方副加圧部移動機構によって副加圧部をスポット作動領域から後退させることで第１溶接電極及び第２溶接電極等のメンテナンス作業空間が確保できる。また、副加圧部を後退位置に保持することで副加圧部を使用しない第１溶接電極と第２溶接電極によるスポット溶接が実行でき、要求に応じたスポット作業が行え、汎用性が得られる。   On the other hand, maintenance work spaces such as the first welding electrode and the second welding electrode can be secured by retracting the auxiliary pressurizing part from the spot operating region by the auxiliary pressurizing part moving mechanism. In addition, by holding the auxiliary pressure part in the retracted position, spot welding can be performed using the first welding electrode and the second welding electrode without using the auxiliary pressure part, spot work can be performed as required, and versatility is obtained. It is done.

第１実施の形態におけるスポット溶接装置の構成図である。It is a block diagram of the spot welding apparatus in 1st Embodiment. 要部構成説明図である。It is principal part structure explanatory drawing. 模式的に示すスポット溶接装置の作動概要説明図である。It is an operation | movement outline explanatory drawing of the spot welding apparatus typically shown. 第２実施の形態におけるスポット溶接装置の要部構成説明図であり、（ａ）は側面図、（ｂ）は（ａ）のａ−ａ線断面図である。It is principal part structure explanatory drawing of the spot welding apparatus in 2nd Embodiment, (a) is a side view, (b) is the sectional view on the aa line of (a). 第３実施の形態におけるスポット溶接装置の要部構成説明図である。It is principal part structure explanatory drawing of the spot welding apparatus in 3rd Embodiment. 第４実施の形態におけるスポット溶接装置の要部構成説明図である。It is principal part structure explanatory drawing of the spot welding apparatus in 4th Embodiment. 第５実施の形態におけるスポット溶接装置の要部構成説明図である。It is principal part structure explanatory drawing of the spot welding apparatus in 5th Embodiment. 従来のスポット溶接の概要を示す説明図である。It is explanatory drawing which shows the outline | summary of the conventional spot welding. 従来のスポット溶接の概要を示す説明図である。It is explanatory drawing which shows the outline | summary of the conventional spot welding.

以下、本発明に係るスポット溶接装置の実施の形態を図を参照して説明する。   Hereinafter, embodiments of a spot welding apparatus according to the present invention will be described with reference to the drawings.

（第１実施の形態）
本発明の第１実施の形態について、図１乃至図３を参照して説明する。図１はスポット溶接装置の構成図、図２は要部構成説明図、図３は模式的に示す作動概要説明図である。なお、このスポット溶接装置の説明にあたり、便宜上図１における上方及び下方をスポット溶接装置における上方及び下方とする。 (First embodiment)
A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a configuration diagram of a spot welding apparatus, FIG. 2 is an explanatory diagram of a main part configuration, and FIG. 3 is an operation schematic explanatory diagram schematically shown. In the description of the spot welding apparatus, the upper and lower parts in FIG. 1 are referred to as the upper and lower parts in the spot welding apparatus for convenience.

スポット溶接装置１は、図１及び図２に示すように図示しない溶接ロボットの手首部にイコライザユニットを介して取り付けられるベース部３及びベース部３の両側から対向して延在する側部４、５を備えた支持ブラケット２を有する。支持ブラケット２の側部４、５に固定アーム１０が取り付けられ、側部４、５の先端部に加圧アクチュエータ２０が取り付けられる。更に、両側部４、５の固定アーム１０と加圧アクチュエータ２０の間に副加圧付与手段３０の副加圧アクチュエータ３１及び図示しない溶接トランスが取り付け支持される。   As shown in FIGS. 1 and 2, the spot welding apparatus 1 includes a base portion 3 attached to a wrist portion of a welding robot (not shown) via an equalizer unit, and side portions 4 extending opposite from both sides of the base portion 3, A support bracket 2 with 5. The fixed arm 10 is attached to the side portions 4 and 5 of the support bracket 2, and the pressure actuator 20 is attached to the tip portions of the side portions 4 and 5. Further, the auxiliary pressure actuator 31 of the auxiliary pressure applying means 30 and a welding transformer (not shown) are attached and supported between the fixed arms 10 of the side portions 4 and 5 and the pressure actuator 20.

固定アーム１０は、支持ブラケット２の両側部４、５に基端が結合されて下方に延在する固定アーム本体１１及び固定アーム本体１１の先端からＬ字状に折曲する電極保持部１２によって形成され、電極保持部１２に第１溶接電極である固定側電極１５が、その頂端１５ａを上方にして装着される。   The fixed arm 10 includes a fixed arm body 11 having a base end coupled to both side portions 4 and 5 of the support bracket 2 and extending downward, and an electrode holding portion 12 bent in an L shape from the distal end of the fixed arm body 11. The fixed electrode 15 that is formed and that is the first welding electrode is mounted on the electrode holding portion 12 with the top end 15a facing upward.

加圧アクチュエータ２０は、サーボモータ２１と、サーボモータ２１によって回転駆動されるボールネジ及びボールネジに螺合するサーボ軸等によるボールねじ送り機構等によって構成された直動部２２を有し、サーボモータ２１の作動によってサーボ軸が昇降往復動する。直動部２２のサーボ軸の下端に電極アーム２４が設けられ、電極アーム２４の先端に固定アーム１０に設けられた固定側電極１５の頂端１５ａと同軸上、即ち中心軸線Ｌ上に固定側電極１５と対向して第２溶接電極である可動側電極２５が設けられる。   The pressurizing actuator 20 includes a servo motor 21, a linear motion portion 22 configured by a ball screw that is rotationally driven by the servo motor 21, a ball screw feeding mechanism that includes a servo shaft that is screwed to the ball screw, and the like. The servo shaft moves up and down by the operation of. An electrode arm 24 is provided at the lower end of the servo shaft of the linear motion portion 22, and the fixed side electrode is coaxial with the top end 15 a of the fixed side electrode 15 provided at the fixed arm 10 at the tip of the electrode arm 24, that is, on the central axis L. A movable side electrode 25 which is a second welding electrode is provided opposite to 15.

これにより加圧アクチュエータ２０のサーボモータ２１の作動により可動側電極２５は固定側電極１５から離反する退避位置と、固定側電極１５と協働して被溶接部材を挟持すると共に加圧力を付与する加圧位置との間を中心軸線Ｌに沿って移動する。この被溶接部材に対する固定側電極１５と可動側電極２５による加圧力Ｆ、即ち固定側電極１５による加圧力ＦＬ及び可動側電極２５による加圧力ＦＵはサーボモータ２１の回転トルクによって決定され、サーボモータ２１の回転トルクを制御することで所望の加圧力が得られる。   As a result, the movable side electrode 25 is moved away from the fixed side electrode 15 by the operation of the servo motor 21 of the pressurizing actuator 20, and the member to be welded is clamped in cooperation with the fixed side electrode 15 and pressure is applied. It moves along the central axis L between the pressurization positions. The pressure F applied by the fixed side electrode 15 and the movable side electrode 25 to the member to be welded, that is, the pressure FL applied by the fixed side electrode 15 and the pressure FU applied by the movable side electrode 25 are determined by the rotational torque of the servo motor 21. By controlling the rotational torque of 21, a desired pressure can be obtained.

副加圧付与手段３０は、支持ブラケット２に保持される副加圧アクチュエータ３１及び副加圧アクチュエータ３１の作動によって中心軸線Ｌの延在方向に沿って回転自在に上下動する円柱状のシャフト３５を有し、シャフト３５の先端に副加圧付与アーム３７を介して副加圧部３８が設けられ、副加圧アクチュエータ３１によって昇降するシャフト３５を副加圧部移動機構４０によって回動制御して副加圧部３８が退避位置、副加圧位置及び後退位置に移動する。   The auxiliary pressure applying means 30 is a columnar shaft 35 that moves up and down rotatably along the extending direction of the central axis L by the operation of the auxiliary pressure actuator 31 held by the support bracket 2 and the auxiliary pressure actuator 31. A sub-pressurizing unit 38 is provided at the tip of the shaft 35 via a sub-pressurizing application arm 37, and the shaft 35 that moves up and down by the sub-pressurizing actuator 31 is controlled to rotate by the sub-pressurizing unit moving mechanism 40. Thus, the auxiliary pressure unit 38 moves to the retracted position, the auxiliary pressure position, and the retracted position.

副加圧アクチュエータ３１は、サーボモータ３２と、サーボモータ３２によって回転駆動されるボールナット及びボールナットに螺合するシャフト３５等によるボールねじ送り機構によって構成された直動部３３を有し、直動部３３から下方に延在するシャフト３５の先端に副加圧付与アーム３７を介して副加圧部３８が設けられる。   The sub-pressurizing actuator 31 includes a servo motor 32, a ball nut that is rotationally driven by the servo motor 32, and a linear motion portion 33 that is configured by a ball screw feeding mechanism including a shaft 35 that is screwed to the ball nut. A sub-pressurizing unit 38 is provided at the tip of the shaft 35 extending downward from the moving unit 33 via a sub-pressurizing application arm 37.

副加圧付与アーム３７は、シャフト３５の先端に基端部３７Ａが結合されて中心軸線Ｌ方向に延在する板状で先端部３７Ｂに副加圧部３８が設けられる。副加圧部３８は基端３８Ａが副加圧付与アーム３７の先端３７Ｂに結合されて中心軸線Ｌ方向に延在する板状で、先端に固定側電極１５の貫通を許容するＵ字状の凹部３８Ｃが形成される。   The auxiliary pressure applying arm 37 has a plate shape in which the base end portion 37A is coupled to the distal end of the shaft 35 and extends in the direction of the central axis L, and the auxiliary pressure applying portion 38 is provided at the distal end portion 37B. The sub-pressurizing portion 38 is a plate shape whose base end 38A is coupled to the distal end 37B of the sub-pressurizing application arm 37 and extends in the direction of the central axis L, and has a U-shape that allows the fixed side electrode 15 to penetrate through the distal end. A recess 38C is formed.

これら固定側電極１５、可動側電極２５及び副加圧部３８によってスポット溶接する際に、可動側電極１２及び副加圧部３８が移動に要する作動占有スペースがスポット作動領域Ａとなる。   When spot welding is performed by the fixed side electrode 15, the movable side electrode 25, and the sub-pressurizing unit 38, the operation occupation space required for the movement of the movable side electrode 12 and the sub-pressurizing unit 38 becomes the spot operation region A.

直動部３３の下端で昇降移動するシャフト３５に連動して副加圧部３８を作動領域となる退避位置と副加圧位置との間の移動及び副加圧部３８をスポット作動領域Ａから離れたスポット作動領域外の後退位置に移動せしめる副加圧部移動機構４０が配置される。   In conjunction with the shaft 35 that moves up and down at the lower end of the linear motion portion 33, the auxiliary pressure member 38 is moved between the retracted position and the auxiliary pressure position, which is the operation region, and the auxiliary pressure member 38 is moved from the spot operation region A. A sub-pressurizing unit moving mechanism 40 that moves to a retracted position outside the spot operating area is provided.

この副加圧部移動機構４０について図２を参照して説明する。副加圧部移動機構４０は、昇降するシャフト３５に回動を制御する軸回転付与部４１を有する。軸回転付与部４１は、直動部３３の下方に配置されてシャフト３５が回転自在に貫通する円筒状で内周に対向して一対の誘導ガイド溝４３が形成されたガイド部４２と、シャフト３５に設けられた被誘導部となる一対のガイドローラ４７によって構成される。   The sub-pressurizing part moving mechanism 40 will be described with reference to FIG. The sub-pressurizing unit moving mechanism 40 includes a shaft rotation applying unit 41 that controls the rotation of the shaft 35 that moves up and down. The shaft rotation imparting portion 41 includes a guide portion 42 disposed below the linear motion portion 33 and having a pair of guide guide grooves 43 formed in a cylindrical shape opposite to the inner periphery thereof, through which the shaft 35 passes rotatably. 35 is constituted by a pair of guide rollers 47 serving as guided portions.

ガイド部４２の内周に形成され誘導ガイド溝４３は、その下端４４ａから中心軸線Ｌと平行に延在する直線状の作動範囲４４と、作動範囲４４の上端から屈曲部４４ｂを介して滑らかに屈曲して内周の周方向に沿うと共に次第に上方向に移行する螺旋状に傾斜して延在する後退誘導範囲４５と、後退誘導範囲４５の上端から屈曲部４５ａを介して上方に直線状で延在する後退保持範囲４６とが連続する略クランク状に形成される。   The guide guide groove 43 formed on the inner periphery of the guide portion 42 is smoothly formed through a linear operation range 44 extending in parallel to the central axis L from the lower end 44a and from the upper end of the operation range 44 via the bent portion 44b. A receding guidance range 45 that bends and extends in a spiral shape along the circumferential direction of the inner circumference and gradually moves upward, and linearly upward from the upper end of the receding guidance range 45 via a bent portion 45a. The extending backward holding range 46 is formed in a continuous crank shape.

一方、シャフト３５の軸方向において同一位置でかつ対向する位置に各ガイドローラ４７が設けられ、各ガイドローラ４７はそれぞれ各誘導ガイド溝４３に移動可能に嵌合する。   On the other hand, each guide roller 47 is provided at the same position in the axial direction of the shaft 35 and opposed to each other, and each guide roller 47 is movably fitted in each guide guide groove 43.

そして、副加圧付与アーム３７に設けられた副加圧部３８の先端部３７Ｂに形成された凹部３８Ｃ内に固定側電極１５が挿入して先端部３８Ｂが固定側電極１５の頂端１５ａより下方となる退避位置においてシャフト３５に設けられた各ガイドローラ４７が誘導ガイド溝４３の作動範囲４４の下端４４ａ近傍に保持される。この退避位置から上昇して副加圧部３８が固定側電極１５と可動側電極２５に挟持加圧された被溶接部材に当接する副加圧位置ではシャフト３５に設けられた各ガイドローラ４７が下端４４ａの近傍から上昇して作動範囲４４の中間位置に保持され、更に、この副加圧位置から上昇するとその上昇に伴ってガイドローラ４７が作動範囲４４から屈曲部４４ｂを介して後退誘導範囲４５に、後退誘導範囲４５から屈曲部４５ａを介して後退保持範囲４６に順次移動し、ガイドローラ４７が後退誘導範囲４５を移動する際にシャフト３５に軸回りの回動が付与されて副加圧部３８の先端３８Ｂが中心軸線Ｌから離反してスポット作動領域Ａから退避する後退位置（図２に副加圧部３８を仮想線３８ａで示す）に揺動し、直線状の後退保持範囲４６内をガイドローラ４７が移動する範囲に亘って副加圧部３８は後退位置に保持される。   Then, the fixed side electrode 15 is inserted into the concave portion 38C formed in the distal end portion 37B of the auxiliary pressure applying portion 38 provided in the auxiliary pressure applying arm 37, and the distal end portion 38B is below the top end 15a of the fixed side electrode 15. At the retracted position, the guide rollers 47 provided on the shaft 35 are held near the lower end 44 a of the operating range 44 of the guide guide groove 43. Each guide roller 47 provided on the shaft 35 is lifted from the retracted position at the sub-pressurizing position where the sub-pressurizing unit 38 contacts the member to be welded and pressed between the fixed electrode 15 and the movable electrode 25. Ascending from the vicinity of the lower end 44a and being held at the intermediate position of the operating range 44, and further ascending from the sub-pressing position, the guide roller 47 is moved backward from the operating range 44 via the bent portion 44b. 45, when the guide roller 47 moves in the backward guiding range 45, the shaft 35 is rotated about its axis and is added as a sub-addition. The tip 38B of the pressure part 38 swings away from the center axis L to the retracted position where the tip 38B is retracted from the spot operating area A (the sub-pressurizing part 38 is indicated by the imaginary line 38a in FIG. 2), 46 The secondary pressure portion 38 over a range of the guide roller 47 is moved is retained in the retracted position.

即ち、サーボモータ３２の作動により副加圧部３８が退避位置と副加圧位置とを往復移動せしめる作動領域においてはガイドローラ４７が誘導ガイド溝４３の作動範囲４４に保持されてシャフト３５の回動が阻止され、副加圧位置から更に上昇させることでガイドローラ４７が後退誘導範囲４５を移動することでシャフト３５が軸回りに回動して軸加圧部３８の先端３８Ｂが中心軸線Ｌから離反してスポット溶接作動領域Ａから退避する後退位置に揺動し、更にシャフト３８が上昇してガイドローラ４７が直線状の後退保持範囲４６を移動することでシャフト３５の回動が規制されて副加圧部３８は後退位置に維持される。   That is, the guide roller 47 is held in the operation range 44 of the guide guide groove 43 in the operation region in which the sub-pressurization unit 38 reciprocates between the retracted position and the sub-pressurization position by the operation of the servo motor 32, and the shaft 35 rotates. When the movement is blocked and the guide roller 47 is further raised from the sub-pressurizing position, the guide roller 47 moves in the backward guiding range 45, whereby the shaft 35 is rotated around the axis, and the tip 38B of the shaft pressurizing portion 38 is center axis L The shaft 35 is moved away from the spot welding operation area A and retracted to the retracted position, and the shaft 38 is further lifted so that the guide roller 47 moves in the receding receding holding range 46 so that the rotation of the shaft 35 is restricted. Thus, the sub-pressurizing unit 38 is maintained at the retracted position.

一方、ガイドローラ４７が誘導ガイド溝４３の後退保持範囲４６に位置する後退位置において、サーボモータ３２の作動によりシャフト３５を下降移動すると、ガイドローラ４７が後退保持範囲４６から後退誘導範囲４５を移動することでシャフト３５が回動して副加圧部３８の先端３８Ｂが中心軸線Ｌ方向に接近移動し、ガイドローラ４７が作動範囲４４を移動することでシャフト３５の回動は規制されて副加圧部３８が作動領域に保持される。   On the other hand, when the guide roller 47 moves down the shaft 35 by the operation of the servo motor 32 in the retracted position where the guide roller 47 is positioned in the retracted holding range 46 of the guide guide groove 43, the guide roller 47 moves from the retracted holding range 46 to the retracted guiding range 45. As a result, the shaft 35 rotates and the tip 38B of the sub-pressurizing portion 38 moves closer in the direction of the central axis L, and the guide roller 47 moves in the operating range 44, whereby the rotation of the shaft 35 is restricted and the sub-pressing portion 38B is controlled. The pressure unit 38 is held in the operating region.

また、サーボモータ３２の作動によって副加圧付与アーム３７の先端に設けた副加圧部３８の先端３８Ｂが固定側電極１５の頂端１５ａより下方となる退避位置から固定側電極１５と可動側電極２５とによって挟持された被溶接部材に下方から当接して副加圧力を付与する副加圧位置に移動する。この副加圧力はサーボモータ３２の回転トルクによって決定され、サーボモータ３２の回転トルクを制御することで要望の副加圧力ｆが得られる。   Further, the fixed-side electrode 15 and the movable-side electrode are moved from the retracted position where the tip 38B of the sub-pressurizing portion 38 provided at the tip of the sub-pressure applying arm 37 by the operation of the servo motor 32 is below the top end 15a of the fixed-side electrode 15. 25, and moves to a sub-pressurizing position where the member to be welded is brought into contact with the member to be welded from below to apply a sub-pressurizing force. This auxiliary pressure is determined by the rotational torque of the servo motor 32, and the desired auxiliary pressure f is obtained by controlling the rotational torque of the servo motor 32.

電源となる溶接トランスの一方の出力端子がバスバ及び固定アーム１０等を介して固定側電極１５に通電可能に接続され、他方の出力端子がバスバ及び電極アーム２４等を介して可動側電極２５に通電可能に接続される。   One output terminal of the welding transformer serving as a power source is connected to the fixed side electrode 15 through the bus bar and the fixed arm 10 so as to be energized, and the other output terminal is connected to the movable side electrode 25 through the bus bar and the electrode arm 24 and the like. It is connected so that it can be energized.

また、図示しない溶接ロボットコントローラには、溶接ロボットのティーチングデータが格納され、ティーチングデータには、被溶接部材の各溶接打点位置を順次スポット溶接するための作動プログラム及び各溶接打点、即ち溶接位置におけるスポット溶接装置１の位置及び姿勢が含まれる。更に、溶接コントローラ５１を備え、溶接コントローラ５１にはスポット溶接装置の作動プログラム及び作動プログラムに設定された各作動行程に基づいて加圧アクチュエータ２０を制御する加圧制御部５２と副加圧アクチュエータ３１を制御する副加圧制御部５３が含まれる。また、溶接コントローラ５１には、予め設定された加圧力Ｆで固定側電極１５と可動側電極２５により被溶接部材を加圧するときのサーボモータ２１の回転トルク、即ち加圧回転トルク及び予め設定された副加圧力ｆで副加圧部３８により被溶接部材に副加圧力を付与するときのサーボモータ３２の回転トルク、即ち副加圧回転トルクが設定される。   A welding robot controller (not shown) stores teaching data of the welding robot, and the teaching data includes an operation program for sequentially spot welding the welding spot positions of the member to be welded and each welding spot, that is, the welding position. The position and attitude of the spot welding apparatus 1 are included. Further, a welding controller 51 is provided. The welding controller 51 includes an operation program for the spot welding apparatus and a pressurization control unit 52 for controlling the pressurization actuator 20 based on each operation stroke set in the operation program, and a sub-pressurization actuator 31. A sub-pressurization control unit 53 that controls the above is included. Further, the welding controller 51 is set in advance with the rotational torque of the servo motor 21 when pressurizing the member to be welded by the fixed side electrode 15 and the movable side electrode 25 with the preset applied pressure F, that is, the pressurized rotational torque. The rotational pressure of the servo motor 32, that is, the sub-pressurizing rotational torque when the sub-pressurizing unit 38 applies the sub-pressurizing force to the member to be welded with the sub-pressurizing force f is set.

次に、スポット溶接装置１の作動を図３の作動概要説明図を参照して説明する。   Next, the operation of the spot welding apparatus 1 will be described with reference to the operation outline explanatory diagram of FIG.

例えば、下から順に剛性の低い薄板１０１、この薄板１０１より剛性が高い第１厚板１０２及び第２厚板１０３が重ね合わされた３枚重ねの板部材からなる被溶接部材１００のスポット溶接にあたり、予め設定されたプログラムに従い、図１及び図２に示すように可動側電極２５が固定側電極１５から離反した退避位置でかつ副加圧付与手段３０の副加圧部３８が退避位置に保持された状態で、ロボットコントローラは溶接ロボットを作動し、図３（ａ）に示すように被溶接部材１００の溶接位置となる打点位置に固定側電極１５の頂端１５ａを当接した状態にスポット溶接装置１を位置決めする。   For example, in spot welding of the member to be welded 100 composed of a thin plate 101 having a lower rigidity in order from the bottom, and a three-layered plate member in which the first thick plate 102 and the second thick plate 103 having higher rigidity than the thin plate 101 are superimposed, According to a preset program, as shown in FIGS. 1 and 2, the movable side electrode 25 is in the retracted position away from the fixed side electrode 15, and the auxiliary pressure applying unit 38 of the auxiliary pressure applying means 30 is held in the retracted position. In this state, the robot controller operates the welding robot so that the top end 15a of the fixed side electrode 15 is brought into contact with the spot position that is the welding position of the welded member 100 as shown in FIG. 1 is positioned.

このスポット溶接装置１が溶接位置に位置決めされた状態では、図３（ａ）に示すように固定側電極１５の頂端１５ａが被溶接部材１００の薄板１０１に下方から当接する一方、可動側電極２５の頂端２５ａが第２厚板１０３と隙間を有して対向し、副加圧部３８の先端部３８Ｂが薄板１０１と隙間を有して対向する。また、シャフト３５に設けられたガイドローラ４６は誘導ガイド溝４２の作動範囲４３の下端４３ａ近傍に保持されてシャフト３５の回動が規制されている。   In a state where the spot welding apparatus 1 is positioned at the welding position, the top end 15a of the fixed side electrode 15 abuts on the thin plate 101 of the member to be welded 100 from below as shown in FIG. The top end 25a faces the second thick plate 103 with a gap, and the tip end portion 38B of the sub-pressing portion 38 faces the thin plate 101 with a gap. The guide roller 46 provided on the shaft 35 is held near the lower end 43a of the operating range 43 of the guide guide groove 42, and the rotation of the shaft 35 is restricted.

次に、図３（ｂ）に示すように、固定側電極１５が被溶接部材１００の薄板１０１に当接した状態で、加圧アクチュエータ２０のサーボモータ２１の作動により可動側電極２５を退避位置から固定側電極１５に接近する加圧位置方向に移動させて第２厚板１０３に上方から当接させる。   Next, as shown in FIG. 3B, the movable side electrode 25 is retracted by the operation of the servo motor 21 of the pressure actuator 20 with the fixed side electrode 15 in contact with the thin plate 101 of the member to be welded 100. From the upper side, the second thick plate 103 is brought into contact with the second thick plate 103 by moving in the direction of the pressurizing position approaching the fixed side electrode 15.

更に、サーボモータ２１を所定トルク、即ち、加圧回転トルクに達するまで作動して可動側電極２５を第２厚板１０３に圧接させる。これにより加圧アクチュエータ２０の加圧力が可動側電極２５と固定アーム１０を介して固定側電極１５とに作用し、可動側電極２５と固定側電極１５とで被溶接部材１００の溶接部を挟持加圧する。   Further, the servo motor 21 is operated until a predetermined torque, that is, a pressurized rotational torque is reached, and the movable electrode 25 is pressed against the second thick plate 103. As a result, the pressure applied by the pressure actuator 20 acts on the fixed side electrode 15 via the movable side electrode 25 and the fixed arm 10, and the movable side electrode 25 and the fixed side electrode 15 hold the welded portion of the member to be welded 100. Pressurize.

一方、副加圧付与手段３０のサーボモータ３２の作動によりシャフト３５を上昇動して副加圧部３８を退避位置から先端部３８Ｂが被溶接部材１００の薄板１０１に固定側電極１５に隣接して下方から圧接する副加圧位置に移動させる。このときシャフト３５に設けられた各ガイドローラ４７がガイド溝４３の作動範囲４４に誘導されて移動することでシャフト３５の回動乃至揺動が防止されて中心軸線Ｌに沿って安定した状態で上昇する。更に、サーボモータ３２を所定トルク、即ち副加圧回転トルクに達するまで作動して副加圧部３８を薄板１０１に圧接させて副加圧力ｆを付与する。   On the other hand, the shaft 35 is moved up by the operation of the servo motor 32 of the sub-pressurizing application means 30 so that the sub-pressurizing portion 38 is moved from the retracted position so that the distal end portion 38B is adjacent to the thin plate 101 of the member 100 to be welded. Then, move to the sub-pressurization position where it is pressed from below. At this time, each guide roller 47 provided on the shaft 35 is guided and moved by the operating range 44 of the guide groove 43, so that the shaft 35 is prevented from rotating or swinging, and is stable along the central axis L. To rise. Further, the servo motor 32 is operated until a predetermined torque, that is, the sub-pressurizing rotational torque is reached, and the sub-pressurizing portion 38 is pressed against the thin plate 101 to apply the sub-pressurizing force f.

このように固定側電極１５と可動側電極２５によって被溶接部材１００を挟持加圧し、副加圧部３８により固定側電極１５に隣接して薄板１０１に下方から副加圧力を付与した状態では、図３（ｃ）に示すように、可動側電極２５による加圧力ＦＵが被溶接部材１００の第２厚板１０３に上方から付与され、固定側電極１５による加圧力ＦＬと副加圧部３８による副加圧力ｆが隣接して薄板１０１に付与される。   Thus, in a state in which the member to be welded 100 is sandwiched and pressed by the fixed side electrode 15 and the movable side electrode 25 and the sub-pressurizing portion 38 is applied to the thin plate 101 from the lower side adjacent to the fixed side electrode 15 from below. As shown in FIG. 3C, a pressing force FU by the movable side electrode 25 is applied to the second thick plate 103 of the member to be welded 100 from above, and by the pressing force FL by the fixed side electrode 15 and the sub pressurizing unit 38. A sub-pressing force f is applied to the thin plate 101 adjacent thereto.

この場合、加圧アクチュエータ２０による加圧力が電極アーム２３等を介して可動側電極２５に作用し、かつ可動側電極２５に対向して固定アーム１０を介して固定側電極１５に作用する一方、副加圧付与手段３０においてサーボモータ３２による付勢力がシャフト３５及び副加圧付与アーム３７等を介して副加圧部３８に作用し、第２厚板１０３に上方から作用する可動側電極２５による加圧力ＦＵと薄板１０１に下方から作用する固定側電極１５による加圧力ＦＬ及び副加圧部３８による副加圧力ｆの総和が等しくなる（ＦＵ＝ＦＬ＋ｆ）。   In this case, the pressure applied by the pressure actuator 20 acts on the movable side electrode 25 via the electrode arm 23 and the like, and acts on the fixed side electrode 15 via the fixed arm 10 so as to face the movable side electrode 25. In the sub-pressurizing application means 30, the urging force of the servo motor 32 acts on the sub-pressurizing unit 38 via the shaft 35, the sub-pressurizing imparting arm 37, etc., and the movable side electrode 25 acting on the second thick plate 103 from above. The sum of the pressure force FU due to the above and the pressure force FL due to the fixed electrode 15 acting on the thin plate 101 from below and the sub-pressure force f due to the sub-pressurization unit 38 are equal (FU = FL + f).

これにより、固定側電極１５から薄板１０１に作用する加圧力ＦＬは、可動側電極２５による加圧力ＦＵから副加圧部３８による副加圧力ｆを減じた加圧力が付与される（ＦＬ＝ＦＵ−ｆ）。   As a result, the pressure FL acting on the thin plate 101 from the fixed electrode 15 is applied by subtracting the sub pressure f by the sub pressure unit 38 from the pressure FU by the movable electrode 25 (FL = FU). -F).

このように薄板１０１側に作用する固定側電極１５からの加圧力ＦＬを第２厚板１０３側に作用する可動側電極２５の加圧力ＦＵより小さく（ＦＬ＜ＦＵ）することで、薄板１０１と第１厚板１０２の接合部における接触圧力が、第１厚板１０２と第２厚板１０３間の溶接部における接触圧力より小さくなり、相対的に薄板１０１と第１厚板１０２間の接触抵抗が大きくなると共に、第１厚板１０２と第２厚板１０３間の接触抵抗が小さくなる。   In this way, the pressing force FL from the fixed electrode 15 acting on the thin plate 101 side is made smaller (FL <FU) than the pressing force FU of the movable electrode 25 acting on the second thick plate 103 side, so that the thin plate 101 and The contact pressure at the joint of the first thick plate 102 is smaller than the contact pressure at the weld between the first thick plate 102 and the second thick plate 103, and the contact resistance between the thin plate 101 and the first thick plate 102 is relatively large. Increases and the contact resistance between the first thick plate 102 and the second thick plate 103 decreases.

次に、この可動側電極２５と固定側電極１５及び副加圧部３８とで被溶接部材１００を挟持加圧して薄板１０１側に位置する固定側電極１５の加圧力ＦＬを第２厚板１０３側に位置する可動側電極２５の加圧力ＦＵより小さくした状態で、溶接トランスから可動側電極２５と固定側電極１５との間に所定時間通電して溶接する。   Next, the member 100 to be welded is sandwiched and pressed by the movable side electrode 25, the fixed side electrode 15, and the sub-pressurizing portion 38, and the applied pressure FL of the fixed side electrode 15 located on the thin plate 101 side is changed to the second thick plate 103. In a state where the applied pressure FU of the movable side electrode 25 located on the side is smaller than that of the movable side electrode 25, the welding transformer is energized for a predetermined time and welded between the movable side electrode 25 and the fixed side electrode 15.

この可動側電極２５と固定側電極１５との間に通電した時に、相対的に薄板１０１と第１厚板１０２間の接合部における接触抵抗が大きく電流密度が高くなると共に、第１厚板１０２と第２厚板１０３間の接触抵抗が小さく保持される。これにより、薄板１０１と第１厚板１０２の接合部における発熱量が第１厚板１０２と第２厚板１０３の接合部における発熱量に対して相対的に増加して、薄板１０１から第２厚板１０３に亘って電流密度の偏りのない良好なナゲットが形成され、薄板１０１の溶接強度が確保できる。   When the movable side electrode 25 and the fixed side electrode 15 are energized, the contact resistance between the thin plate 101 and the first thick plate 102 is relatively large, the current density is increased, and the first thick plate 102 is increased. And the second thick plate 103 are kept small in contact resistance. As a result, the amount of heat generated at the joint between the thin plate 101 and the first thick plate 102 is relatively increased with respect to the amount of heat generated at the joint between the first thick plate 102 and the second thick plate 103, and the second from the thin plate 101. A good nugget with no uneven current density is formed over the thick plate 103, and the welding strength of the thin plate 101 can be ensured.

しかる後、副加圧アクチュエータ３１のサーボモータ３２の作動により副加圧部３８を退避位置に移動させ、かつ加圧アクチュエータ２０のサーボモータ２１の作動により可動側電極２５を加圧位置から退避位置に移動させて固定側電極１５と可動側電極２５とによる被溶接部材１００の挟持を開放する。   Thereafter, the sub-pressurizing unit 38 is moved to the retracted position by the operation of the servo motor 32 of the sub-pressurizing actuator 31, and the movable side electrode 25 is retracted from the pressurizing position by the operation of the servomotor 21 of the pressurizing actuator 20. To be held by the fixed side electrode 15 and the movable side electrode 25 to be released.

次に、作動プログラムに従い溶接ロボットを作動して、スポット溶接装置１を被溶接部材１００の打点位置から退避させ、次の被溶接部材１００の打点位置に移動する。   Next, the welding robot is operated according to the operation program, and the spot welding apparatus 1 is retracted from the spot position of the welded member 100 and moved to the spot position of the next welded member 100.

一方、例えば固定側電極１５及び可動側電極２５等のメンテナンス等にあたっては、副加圧付与手段３０のサーボモータ３２の作動によりシャフト３５を、各ガイドローラ４７が誘導ガイド溝４３の後退保持範囲４６に移動する後退保持位置まで上昇させる。即ち、このシャフト３５の移動に伴って各ガイドローラ４７が作動範囲４４を上昇してシャフト３５の先端に支持された副加圧部３８が中心軸線Ｌに沿って上昇移動し、更に各ガイドローラ４７が後退誘導範囲４５を移動してシャフト３５が上昇しつつ回動して副加圧部３８の先端部３８Ｂがスポット作動領域Ａから後退し、更にガイドローラ４７が後退保持範囲４６において副加圧部３８が仮想線３８ａで示すようにスポット作動領域Ａから退避する後退位置に保持される。   On the other hand, for example, in maintenance of the fixed side electrode 15 and the movable side electrode 25, the shaft 35 is moved by the operation of the servo motor 32 of the auxiliary pressure applying means 30, and each guide roller 47 moves backward in the guide guide groove 43. Raise to the backward holding position to move to. That is, with the movement of the shaft 35, each guide roller 47 rises in the operating range 44, and the auxiliary pressure member 38 supported at the tip of the shaft 35 moves up along the central axis L. Further, each guide roller 47 moves in the retraction guide range 45 and the shaft 35 rotates while being lifted to move the tip end portion 38B of the sub-pressurizing unit 38 from the spot operating area A, and the guide roller 47 is further sub-added in the retraction holding range 46. The pressure portion 38 is held at the retracted position where it is retracted from the spot operation area A as indicated by a virtual line 38a.

このように副加圧部３８をスポット作動領域Ａから退避することで該部に固定側電極１５や可動側電極２５の交換等のメンテナンス作業のスペースが確保できる。   Thus, by retracting the sub-pressurizing unit 38 from the spot operating area A, a space for maintenance work such as replacement of the fixed side electrode 15 and the movable side electrode 25 can be secured in this part.

また、副加圧部３８を後退位置に保持することでスポット作動領域が確保でき、副加圧部３８を使用しない固定側電極１５と可動側電極２５によるスポット溶接が実行できる。   Further, by holding the sub-pressurizing unit 38 in the retracted position, a spot working region can be secured, and spot welding by the fixed side electrode 15 and the movable side electrode 25 not using the sub-pressurizing unit 38 can be executed.

一方、ガイドローラ４７が誘導ガイド溝４３の後退保持範囲４６に位置する後退位置において、サーボモータ３２の作動でシャフト３５を下降移動するとガイドローラ４７が後退保持範囲４６から後退誘導範囲４５を移動してシャフト３５が回動して副加圧部３８の先端３８Ｂが中心軸線Ｌ方向に接近移動し、ガイドローラ４７が作動範囲４４に移動することで副加圧部３８が作動領域に復帰する。   On the other hand, when the shaft 35 is moved downward by the operation of the servo motor 32 in the retracted position where the guide roller 47 is positioned in the retracted holding range 46 of the guide guide groove 43, the guide roller 47 moves from the retracted holding range 46 to the retracted guiding range 45. Thus, the shaft 35 rotates, the tip 38B of the sub-pressurizing unit 38 moves closer to the central axis L direction, and the guide roller 47 moves to the operating range 44, whereby the sub-pressurizing unit 38 returns to the operating region.

このように構成された本実施の形態によると、固定側電極１５と可動側電極２５によって加圧付与した被溶接部材に副加圧付与手段３０の副加圧部３８から副加圧力ｆが付与され、固定側電極１５と可動側電極２５による加圧力ＦＬ、ＦＵが制御されて剛性の異なる板材を重ねた被溶接部材に対する溶接品質が向上する。   According to the present embodiment configured as described above, the auxiliary pressure f is applied from the auxiliary pressurizing unit 38 of the auxiliary pressurizing application means 30 to the member to be welded that is pressurized by the fixed electrode 15 and the movable electrode 25. In addition, the welding pressures FL and FU by the fixed side electrode 15 and the movable side electrode 25 are controlled to improve the welding quality for the member to be welded on which the plate materials having different rigidity are stacked.

一方、被溶接部材に副加圧力を付与する副加圧付与手段３０の副加圧アクチュエータ３１の作動により副加圧部３８をスポット作動領域Ａから後退させることで、固定側電極１５及び可動側電極２５やスポット作動領域Ａ及びスポット作動領域Ａの周辺の構成部品等のメンテナンス作業空間が確保できる。   On the other hand, by moving the sub-pressurizing portion 38 from the spot operating region A by the operation of the sub-pressurizing actuator 31 of the sub-pressurizing applying means 30 that applies the sub-pressurizing force to the welded member, the fixed side electrode 15 and the movable side electrode 15 are moved. Maintenance work spaces such as the electrode 25, the spot operation area A, and the components around the spot operation area A can be secured.

また、副加圧部３８を後退位置に保持することで副加圧部３８を使用しない固定側電極１５と可動側電極２５によるスポット溶接が実行でき、要求に応じたスポット作業が行え、汎用性が得られる。   Further, by holding the sub-pressurizing unit 38 in the retracted position, spot welding can be performed by the fixed side electrode 15 and the movable side electrode 25 that do not use the sub-pressurizing unit 38, spot work can be performed according to demand, and versatility. Is obtained.

なお、副加圧部３８の先端３８Ｂに形成されるＵ字状の凹部３８Ｃは、固定側電極１５及び可動側電極２５との接触を回避可能であれば種々の形状に変更可能であるが、後退位置に移動する方向に合わせたＵ字形状に形成することが好ましい。   The U-shaped recess 38C formed at the tip 38B of the sub-pressurizing unit 38 can be changed to various shapes as long as contact with the fixed side electrode 15 and the movable side electrode 25 can be avoided. It is preferable to form a U-shape that matches the direction of movement to the retracted position.

（第２実施の形態）
本発明の第２実施の形態について、図４を参照して説明する。なお、本実施の形態におけるスポット溶接装置は、シャフトに連動して副加圧部を後退させる副加圧部移動機構及び副加圧部の具体的構成が第１実施の形態と異なり、他の構成は第１実施の形態と同一構成であり、対応する部分に同一符号を付することで、該部の詳細な説明を省略し、副加圧部移動機構を主に説明する。 (Second Embodiment)
A second embodiment of the present invention will be described with reference to FIG. The spot welding apparatus in the present embodiment is different from the first embodiment in the specific configuration of the sub-pressurizing unit moving mechanism and the sub-pressurizing unit that retracts the sub-pressurizing unit in conjunction with the shaft. The configuration is the same as that of the first embodiment, and the same reference numerals are given to corresponding portions, and detailed description of the portions is omitted, and the sub-pressurizing portion moving mechanism will be mainly described.

図４（ａ）は副加圧部移動機構５５の概要を示す側面図、（ｂ）は（ａ）のａ−ａ線断面図である。   4A is a side view showing an outline of the sub-pressurizing part moving mechanism 55, and FIG. 4B is a cross-sectional view taken along the line aa in FIG.

副加圧部移動機構５５は、軸回転付与部４１を有し、軸回転付与部４１は、直動部３３の下方に配置されてシャフト３５が回転自在に貫通する円筒状のガイド部４２を有し、ガイド部４２の内周面に、下端４４ａから上方に延在する直線状の作動範囲４４と、作動範囲４４の上端から屈曲部４４ｂを介して内周の周方向に沿うと共に次第に上方向に移行する後退誘導範囲４５と、後退誘導範囲４５の上端から屈曲部４５ａを介して上方に直線状で延在する後退保持範囲４６とが連続する誘導ガイド溝４３が形成される。一方、シャフト３５の外周には誘導ガイド溝４３に移動可能に嵌合するガイドローラ４７が設けられる。   The sub-pressurizing unit moving mechanism 55 includes a shaft rotation imparting unit 41. The shaft rotation imparting unit 41 is disposed below the linear motion unit 33 and includes a cylindrical guide unit 42 through which the shaft 35 is rotatably passed. A linear operation range 44 extending upward from the lower end 44a on the inner peripheral surface of the guide portion 42, and along the circumferential direction of the inner periphery from the upper end of the operation range 44 via the bent portion 44b and gradually upward. A guide guide groove 43 is formed in which the backward guide range 45 that moves in the direction and the backward holding range 46 that extends linearly upward from the upper end of the backward guide range 45 via the bent portion 45a are formed. On the other hand, a guide roller 47 that is movably fitted in the guide guide groove 43 is provided on the outer periphery of the shaft 35.

シャフト３５の先端に副加圧部５８が支持される。副加圧部５８は板状であって、中央部に長孔５８ａを有し、後端５８Ａに凹溝５８Ｄが形成されると共に先端５８Ｂに固定側電極１５の貫通を許容するＵ字状の凹部５８Ｃが形成される。   A sub-pressurizing unit 58 is supported at the tip of the shaft 35. The sub-pressurizing portion 58 is plate-shaped, has a long hole 58a at the center, has a concave groove 58D formed at the rear end 58A, and has a U-shape that allows the fixed-side electrode 15 to pass through the tip 58B. A recess 58C is formed.

この副加圧部５８は、長孔５８ａにシャフト３５の先端に形成された軸部３５ａが挿入して軸部３５ａの先端に設けた円板状のフランジ部５９によって脱落が防止され、後端５８Ａの凹溝５８Ｄが上下方向に延在する固定部材、本実施の形態では固定アーム１０の固定アーム本体１１に移動可能に嵌合する。更にフランジ部５９と副加圧部５８との間に、副加圧部５８をシャフト３５の回動に連動して中心軸線Ｌに接離せしめるピン５７ａ及びピン５７ｂを介在して揺動自在にリンク５７によって構成される副加圧部突出機構が設けられる。そして、シャフト３５と一体的にフランジ部５９が回動することで副加圧部５８が中心軸線Ｌに接離する方向に前進及び後退移動する。   The sub-pressurizing portion 58 is prevented from falling off by a disc-shaped flange portion 59 provided at the front end of the shaft portion 35a by inserting the shaft portion 35a formed at the front end of the shaft 35 into the long hole 58a. A concave member 58D of 58A is movably fitted to a fixed member extending in the vertical direction, in this embodiment, the fixed arm body 11 of the fixed arm 10. Further, between the flange portion 59 and the sub-pressurizing portion 58, a pin 57a and a pin 57b that move the sub-pressurizing portion 58 to and away from the central axis L in conjunction with the rotation of the shaft 35 are swingable. A sub-pressurizing part projecting mechanism constituted by the link 57 is provided. Then, when the flange portion 59 rotates integrally with the shaft 35, the auxiliary pressure portion 58 moves forward and backward in a direction in which it is in contact with and away from the central axis L.

このように構成された副加圧部移動機構５５を備えた副加圧部５８の作動を説明する。   The operation of the sub pressurizing unit 58 including the sub pressurizing unit moving mechanism 55 configured as described above will be described.

副加圧部５８の先端５８Ｂが固定側電極１５の頂端１５ａより下方となる退避位置においては、シャフト３５に設けられたガイドローラ４７が誘導ガイド溝４３の作動範囲４４の下端４４ａ近傍に保持される。サーボモータ３２の作動によりシャフト３５が上昇して副加圧部５８の先端５８Ｂが固定電極１５と可動側電極２５とによって挟持加圧された被溶接部材に当接する副加圧位置ではガイドローラ４７が作動範囲４４の中間位置に保持され、更に副加圧位置から上昇するに伴ってガイドローラ４７が作動範囲４４から後退誘導範囲４５、後退保持範囲４６に順次移動し、このガイドローラ４７が後退誘導範囲４５を移動する際にシャフト３５及びフランジ部５９が共に回動してリンク５７を介して副加圧部５８が軸部３５ａ及び固定アーム本体１１に移動可能に嵌合する凹溝５８Ｄによって案内されつつ先端５８Ｂが中心軸線Ｌから離反してスポット作動領域Ａから退避する後退位置に移動し、後退保持範囲４６内をガイドローラ４７が移動する範囲に亘って副加圧部５８は後退位置に保持される。   At the retracted position where the tip 58B of the sub-pressurizing unit 58 is below the top end 15a of the stationary electrode 15, the guide roller 47 provided on the shaft 35 is held near the lower end 44a of the operating range 44 of the guide guide groove 43. The When the servo motor 32 is actuated, the shaft 35 is raised, and the tip 58B of the sub-pressurizing portion 58 is in the sub-pressurizing position where it abuts against the member to be welded and pressed by the fixed electrode 15 and the movable electrode 25. Is held at the intermediate position of the operating range 44, and further, as it rises from the sub-pressurizing position, the guide roller 47 sequentially moves from the operating range 44 to the backward guiding range 45 and the backward holding range 46, and this guide roller 47 moves backward. When the shaft 35 and the flange portion 59 rotate together when moving in the guide range 45, the sub-pressurizing portion 58 is movably fitted to the shaft portion 35 a and the fixed arm main body 11 via the link 57. While being guided, the tip 58B moves away from the central axis L and moves to the retreat position where the tip 58B retreats from the spot operation area A, and the guide roller 47 moves within the retreat holding range 46. Over a range auxiliary pressing 58 is held in the retracted position.

即ち、サーボモータ３２の作動により副加圧部３８が退避位置と副加圧位置とを往復移動せしめる作動領域においてはガイドローラ４７が誘導ガイド溝４３の作動範囲４４に保持されてシャフト３５の回動が阻止され、副加圧位置から更に上昇させることでガイドローラ４７が後退誘導範囲４５を移動することシャフト３５及びフランジ部５９が回動してリンク５７を介して副加圧部５８の先端５８Ｂが中心軸線Ｌから離反してスポット作動領域Ａから退避した後退位置に後退移動し、更にシャフト３８が上昇してガイドローラ４６が直線状の後退保持範囲４６を移動することでシャフト３５の回動が規制されて副加圧部５８はスポット作動領域Ａから退避した後退位置に維持される。   That is, the guide roller 47 is held in the operation range 44 of the guide guide groove 43 in the operation region in which the sub-pressurization unit 38 reciprocates between the retracted position and the sub-pressurization position by the operation of the servo motor 32, and the shaft 35 rotates. The movement is blocked and the guide roller 47 is further moved up from the sub-pressing position, so that the guide roller 47 moves in the backward guiding range 45. The shaft 35 and the flange portion 59 are rotated and the tip of the sub-pressing portion 58 is connected via the link 57. 58B moves away from the central axis L and moves backward to the retracted position retracted from the spot operating area A, and the shaft 38 is further lifted to move the guide roller 46 through the linear retracting holding range 46 so that the shaft 35 rotates. The movement is restricted, and the sub-pressurizing unit 58 is maintained at the retracted position retracted from the spot operation area A.

一方、ガイドローラ４７が誘導ガイド溝４３の後退保持範囲４６に位置する後退位置において、サーボモータ３２の作動によりシャフト３５を下降移動するとガイドローラ４７が後退保持範囲４６から後退誘導範囲４５を移動することでシャフト３５及びフランジ部５９が回動してリンク５７を介して副加圧部５８の先端５８Ｂが中心軸線Ｌ方向に接近移動し、ガイドローラ４７が作動範囲４４に移動することで副加圧部５８が作動領域に復帰する。   On the other hand, when the shaft 35 is moved downward by the operation of the servo motor 32 in the retracted position where the guide roller 47 is positioned in the retracted holding range 46 of the guide guide groove 43, the guide roller 47 moves from the retracted holding range 46 to the retracted guiding range 45. As a result, the shaft 35 and the flange portion 59 are rotated, and the tip 58B of the sub-pressurizing portion 58 approaches and moves in the direction of the central axis L via the link 57, and the guide roller 47 moves to the operating range 44, thereby sub-adding. The pressure part 58 returns to the operating region.

このように構成された本実施の形態によると、被溶接部材に副加圧力を付与する副加圧付与手段３０の副加圧アクチュエータ３１の作動により回動してリンク５７を介して副加圧部５８をスポット作動領域Ａから後退させることで、固定側電極１５及び可動側電極２５やスポット作動領域Ａ及びスポット作動領域Ａの周辺の構成部品等のメンテナンス作業空間が確保できる。   According to this embodiment configured as described above, the sub-pressurizing actuator 31 of the sub-pressurizing application means 30 that applies the sub-pressurizing force to the welded member is rotated by the operation of the sub-pressurizing actuator 31 and the sub-pressurizing is performed via the link 57. By retracting the portion 58 from the spot operating area A, it is possible to secure a maintenance work space for the fixed side electrode 15 and the movable side electrode 25, the spot operating area A, the components around the spot operating area A, and the like.

（第３実施の形態）
本発明の第３実施の形態について、図５を参照して説明する。なお、本実施の形態におけるスポット溶接装置は、シャフトに連動して副加圧部を後退させる副加圧部移動機構及び副加圧部の具体的構成が第１実施の形態と異なり、他の構成は第１実施の形態と同一構成であり、対応する部分に同一符号を付することで、該部の詳細な説明を省略し、副加圧部移動機構を主に説明する。 (Third embodiment)
A third embodiment of the present invention will be described with reference to FIG. The spot welding apparatus in the present embodiment is different from the first embodiment in the specific configuration of the sub-pressurizing unit moving mechanism and the sub-pressurizing unit that retracts the sub-pressurizing unit in conjunction with the shaft. The configuration is the same as that of the first embodiment, and the same reference numerals are given to corresponding portions, and detailed description of the portions is omitted, and the sub-pressurizing portion moving mechanism will be mainly described.

図５に副加圧部移動機構６０の概要を示す。副加圧部移動機構６０は、昇降するシャフト３５の回動を制御する軸回転付与部４１を有し、軸回転付与部４１は、直動部３３の下方に配置されてシャフト３５が回転自在に貫通する円筒状のガイド部４２を有し、ガイド部４２の内周面に、下端４４ａから上方に延在する直線状の作動範囲４４と、作動範囲４４の上端から屈曲部４４ｂを介して内周の周方向に沿うと共に上方向に移行する後退誘導範囲４５と、後退誘導範囲４５の上端から屈曲部４５ａを介して上方に延在する後退保持範囲４６とが連続する誘導ガイド溝４３が形成される。一方、シャフト３５の外周には誘導ガイド溝４３に移動可能に嵌合するガイドローラ４７が設けられる。   FIG. 5 shows an outline of the sub-pressurizing unit moving mechanism 60. The sub-pressurizing part moving mechanism 60 includes an axial rotation imparting part 41 that controls the rotation of the shaft 35 that moves up and down, and the axial rotation imparting part 41 is disposed below the linear movement part 33 so that the shaft 35 is freely rotatable. The guide portion 42 has a cylindrical guide portion 42 penetrating into the guide portion 42, and has a linear operation range 44 extending upward from the lower end 44 a on the inner peripheral surface of the guide portion 42, and a bent portion 44 b from the upper end of the operation range 44. There is a guide guide groove 43 in which a backward guiding range 45 that extends along the inner circumferential direction and moves upward, and a backward holding range 46 that extends upward from the upper end of the backward guiding range 45 via the bent portion 45a. It is formed. On the other hand, a guide roller 47 that is movably fitted in the guide guide groove 43 is provided on the outer periphery of the shaft 35.

シャフト３５の先端に副加圧付与アーム６１の中心部が回動自在に軸支される。副加圧付与アーム６１の後部６１Ａに固定部材、本実施の形態では固定アーム１０の固定アーム本体１１に移動可能に嵌合する凹溝６１Ｄが形成される。一方、副加圧付与アーム６１の先端に副加圧部６８の基端６８Ａを軸６７によって上方に揺動自在に支持する。副加圧部５８の先端６８Ｂに固定側電極１５の貫通を許容するＵ字状の凹部６８Ｃが形成されると共に、基端面６８ａが副加圧付与アーム６１の先端面６１ａに当接することで副加圧部５８の下方への揺動が規制される。   The central portion of the sub-pressurizing application arm 61 is pivotally supported at the tip of the shaft 35 so as to be rotatable. A concave member 61 </ b> D is formed in the rear portion 61 </ b> A of the sub-pressurizing application arm 61 so as to be movably fitted to the fixed arm body 11 of the fixed arm 10 in this embodiment. On the other hand, the base end 68 </ b> A of the sub-pressurizing unit 68 is supported on the tip of the sub-pressurizing application arm 61 so as to be swingable upward by a shaft 67. A U-shaped recess 68 </ b> C that allows the fixed-side electrode 15 to penetrate is formed at the distal end 68 </ b> B of the sub-pressurizing unit 58, and the base end surface 68 a abuts on the distal end surface 61 a of the sub-pressurizing application arm 61. The downward swing of the pressurizing unit 58 is restricted.

また、シャフト３５に円板状のフランジ部６３が一体的に設けられる。このフランジ６３の外周面と副加圧部６８の側面との間に、副加圧部６８をシャフト３５の回動に連動して揺動せしめるジョイント６４ａ及び６４ｂを介在して揺動自在にリンク６４が架設する副加圧部揺動機構が配置される。   Further, the shaft 35 is integrally provided with a disk-like flange portion 63. Between the outer peripheral surface of the flange 63 and the side surface of the sub-pressurizing unit 68, the joints 64a and 64b that oscillate the sub-pressurizing unit 68 in conjunction with the rotation of the shaft 35 are slidably linked. A sub-pressurizing unit swinging mechanism 64 is installed.

このように構成された副加圧部移動機構６０を備えた副加圧部６８の作動を説明する。   The operation of the sub-pressurizing unit 68 including the sub-pressurizing unit moving mechanism 60 configured as described above will be described.

副加圧部６８の先端６８Ｂが固定側電極１５の頂端１５ａより下方となる退避位置においては、シャフト３５に設けられたガイドローラ４７が誘導ガイド溝４３の作動範囲４４の下端４４ａ近傍に保持される。サーボモータ３２の作動によりシャフト３５が上昇して副加圧部６８の先端６８Ｂが固定側電極１５と可動側電極２５とによって挟持加圧された被溶接部材に当接する副加圧位置ではシャフト３５に設けられたガイドローラ４７が作動範囲４４の中間位置に保持され、更に副加圧位置から上昇するに伴ってガイドローラ４７が作動範囲４４から後退誘導範囲４５、後退保持範囲４６に順次移動し、ガイドローラ４７が後退誘導範囲４６を移動する際にシャフト３５及びフランジ部６３が回動してリンク６４を介して副加圧部６８が軸部６７を支点として先端６８Ｂが上方に揺動してスポット作動領域Ａから退避する後退位置に移動し、後退範囲４６内をガイドローラ４７が移動する範囲に亘って副加圧部６８は後退位置に保持される。   At the retracted position where the tip 68B of the sub-pressurizing portion 68 is below the top end 15a of the fixed electrode 15, the guide roller 47 provided on the shaft 35 is held near the lower end 44a of the operating range 44 of the guide guide groove 43. The The shaft 35 is raised by the operation of the servo motor 32, and the shaft 35 is in the sub-pressurizing position where the tip 68B of the sub-pressurizing portion 68 contacts the member to be welded and pressed by the fixed side electrode 15 and the movable side electrode 25. Guide roller 47 is held at the intermediate position of the operating range 44, and as the guide roller 47 is further lifted from the sub-pressing position, the guide roller 47 sequentially moves from the operating range 44 to the backward guiding range 45 and the backward holding range 46. When the guide roller 47 moves in the backward guiding range 46, the shaft 35 and the flange portion 63 rotate, and the auxiliary pressure member 68 swings upward with the shaft portion 67 as a fulcrum via the link 64. Thus, the auxiliary pressure member 68 is held at the retracted position over the range in which the guide roller 47 moves within the retracted range 46.

一方、ガイドローラ４７が誘導ガイド溝４３の後退保持範囲４６に位置する後退位置において、サーボモータ３２の作動によりシャフト３５を下降移動するとガイドローラ４７が後退保持範囲４６から後退誘導範囲４５を移動することでシャフト３５及びフランジ部６３が回動してリンク６４を介して副加圧部６８が下方に揺動して先端６８Ｂが中心軸線Ｌ方向に接近移動し、ガイドローラ４７が作動範囲４４に移動することで副加圧部５８が作動領域に復帰する。   On the other hand, when the shaft 35 is moved downward by the operation of the servo motor 32 in the retracted position where the guide roller 47 is positioned in the retracted holding range 46 of the guide guide groove 43, the guide roller 47 moves from the retracted holding range 46 to the retracted guiding range 45. As a result, the shaft 35 and the flange portion 63 rotate, the sub-pressurizing portion 68 swings downward via the link 64, the tip 68B moves closer in the direction of the central axis L, and the guide roller 47 enters the operating range 44. By moving, the auxiliary pressure unit 58 returns to the operating region.

（第４実施の形態）
本発明の第４実施の形態について図６を参照して説明する。なお、本実施の形態におけるスポット溶接装置は、シャフトに連動して副加圧部を後退させる副加圧部移動機構及び副加圧部の具体的構成が第１実施の形態と異なり、他の構成は第１実施の形態と同一構成であり、対応する部分に同一符号を付することで、該部の詳細な説明を省略し、副加圧部移動機構を主に説明する。 (Fourth embodiment)
A fourth embodiment of the present invention will be described with reference to FIG. The spot welding apparatus in the present embodiment is different from the first embodiment in the specific configuration of the sub-pressurizing unit moving mechanism and the sub-pressurizing unit that retracts the sub-pressurizing unit in conjunction with the shaft. The configuration is the same as that of the first embodiment, and the same reference numerals are given to corresponding portions, and detailed description of the portions is omitted, and the sub-pressurizing portion moving mechanism will be mainly described.

図６に副加圧部移動機構７０の概要を示す。副加圧部移動機構７０は、固定部材、本実施の形態では固定アーム１０の固定アーム本体１１にガイド部７２を有し、ガイド部７２に誘導ガイド溝７３が形成される。誘導ガイド溝７３は、下端７４ａから上方に延在する直線状の作動範囲７４と、作動範囲７４の上端から屈曲部７４ｂを介して中心軸線Ｌから次第に離反すると共に上方向に移行するように傾斜する後退誘導範囲７５と、後退誘導範囲７５の上端から屈曲部７５ａを介して上方に直線状で延在する後退保持範囲７６とが連続する。   FIG. 6 shows an outline of the sub-pressurizing unit moving mechanism 70. The sub-pressurizing unit moving mechanism 70 has a guide member 72 in a fixed member, in this embodiment, the fixed arm main body 11 of the fixed arm 10, and a guide guide groove 73 is formed in the guide unit 72. The guide guide groove 73 is inclined so as to gradually move away from the central axis L and move upward from the upper end of the operation range 74 via the bent portion 74b and the linear operation range 74 extending upward from the lower end 74a. The retraction guidance range 75 to be continued and the retraction holding range 76 extending linearly upward from the upper end of the retraction guidance range 75 via the bent portion 75a.

シャフト３５の先端に副加圧部７８を移動可能に保持する副加圧部保持機構７１を備える。副加圧部７８は長尺な板状であって中央部がシャフト３５の先端に中心軸線Ｌから離反する方向に前進及び後退移動可能に副加圧部保持機構７１によって支持され、後端７８Ａに誘導ガイド溝７３に移動可能に嵌合するガイドローラ７７が設けられると共に先端７８Ｂに固定側電極１５の貫通を許容するＵ字状の凹部７８Ｃが形成される。   A sub-pressurizing unit holding mechanism 71 that movably holds the sub-pressurizing unit 78 is provided at the tip of the shaft 35. The sub-pressurizing portion 78 is a long plate-like shape, and the central portion is supported by the sub-pressurizing portion holding mechanism 71 so as to be able to move forward and backward in the direction away from the central axis L at the front end of the shaft 35, and the rear end 78A. A guide roller 77 movably fitted in the guide guide groove 73 is provided, and a U-shaped recess 78C that allows the fixed side electrode 15 to pass therethrough is formed at the tip 78B.

このように構成された副加圧部移動機構７０を備えた副加圧部７８の作動を説明する。   The operation of the sub-pressurizing unit 78 including the sub-pressurizing unit moving mechanism 70 configured as described above will be described.

副加圧部７８の先端７８Ｂが固定側電極１５の頂端１５ａより下方となる退避位置においては、副加圧部７８の後端７８Ａに設けたガイドローラ７７が誘導ガイド溝７３の作動範囲７４の下端７４ａ近傍に保持される。サーボモータ３２の作動によりシャフト３５が上昇して副加圧部７８の先端７８Ｂが固定電極１５と可動側電極２５とで挟持加圧された被溶接部材に当接する副加圧位置ではガイドローラ７７が作動範囲７４の中間位置に保持され、更に副加圧位置から上昇するに伴ってガイドローラ７７が作動範囲７４から後退誘導範囲７５、後退保持範囲７６に順次移動し、ガイドローラ７７が後退誘導範囲７５を移動する際に副加圧部７８の先端７８Ｂが中心軸線Ｌから離反する後退方向に移動してスポット作動領域Ａから退避する後退位置に移動し、後退保持範囲７６内をガイドローラ７７が移動する範囲に亘って副加圧部７８は後退位置に保持される。   At the retracted position where the tip 78B of the sub-pressurizing portion 78 is below the top end 15a of the fixed electrode 15, the guide roller 77 provided at the rear end 78A of the sub-pressurizing portion 78 is within the operating range 74 of the guide guide groove 73. It is held near the lower end 74a. When the servo motor 32 is actuated, the shaft 35 is raised, and the tip 78B of the sub-pressurizing portion 78 is in the sub-pressurizing position where it abuts on the member to be welded and pressed between the fixed electrode 15 and the movable electrode 25. Is held at the intermediate position of the operating range 74, and as it further rises from the sub-pressurizing position, the guide roller 77 sequentially moves from the operating range 74 to the backward guiding range 75 and the backward holding range 76, and the guide roller 77 is guided backward. When moving in the range 75, the tip 78B of the sub-pressurizing unit 78 moves in the retreating direction away from the central axis L and moves to the retreat position where the sub-pressurizing unit 78 retreats from the spot operating area A. The sub-pressurizing unit 78 is held in the retracted position over the range in which the valve moves.

一方、ガイドローラ７７がガイド溝７３の後退保持範囲７６に位置する後退位置において、サーボモータ３２の作動によりシャフト３５を下降移動するとガイドローラ７７が後退保持範囲７５から後退誘導範囲７４を移動することで副加圧部７８が前進移動し、ガイドローラ７７が作動範囲７４に移動することで副加圧部７８が作動領域に復帰する。   On the other hand, when the shaft 35 is moved downward by the operation of the servo motor 32 in the retracted position where the guide roller 77 is positioned in the retracted holding range 76 of the guide groove 73, the guide roller 77 moves from the retracted holding range 75 to the retracted guiding range 74. Thus, the auxiliary pressure unit 78 moves forward, and the guide roller 77 moves to the operation range 74, whereby the auxiliary pressure unit 78 returns to the operation region.

（第５実施の形態）
本発明の第５実施の形態について、図７を参照して説明する。なお、本実施の形態におけるスポット溶接装置は、シャフトに連動して副加圧部を後退させる副加圧部移動機構及び副加圧部の具体的構成が第１実施の形態と異なり、他の構成は第１実施の形態と同一構成であり、対応する部分に同一符号を付することで、該部の詳細な説明を省略し、副加圧部移動機構を主に説明する。 (Fifth embodiment)
A fifth embodiment of the present invention will be described with reference to FIG. The spot welding apparatus in the present embodiment is different from the first embodiment in the specific configuration of the sub-pressurizing unit moving mechanism and the sub-pressurizing unit that retracts the sub-pressurizing unit in conjunction with the shaft. The configuration is the same as that of the first embodiment, and the same reference numerals are given to corresponding portions, and detailed description of the portions is omitted, and the sub-pressurizing portion moving mechanism will be mainly described.

図７に副加圧部移動機構８０の概要を示す。副加圧部移動機構８０は、シャフト３５の先端に軸８１ａを介してリンク８１が垂下され、リンク８１の下端に軸８１ｂを介して副加圧付与アーム８７の中央部が回動自在に支持される。副加圧付与アーム８７の後端８７Ａが支持ブラケット２等の固定部材から垂下する支持アーム８３の先端に軸８３ａを介して連結され、副加圧付与アーム８７の先端８７Ｂに副加圧部８８が設けられる。副加圧部８８は基端８８Ａが副加圧付与アーム８７の先端部８７Ｂに結合されて中心軸線Ｌ方向に延在する板状で、先端８８Ｂに固定側電極１５の貫通を許容するＵ字状の凹部８８Ｃが形成される。

FIG. 7 shows an outline of the sub-pressurizing part moving mechanism 80. In the sub-pressurizing unit moving mechanism 80, the link 81 is suspended from the tip of the shaft 35 via a shaft 81a, and the central portion of the sub-pressurizing application arm 87 is rotatably supported at the lower end of the link 81 via a shaft 81b. Is done. The rear end 87A of the sub-pressurizing application arm 87 is connected to the front end of a support arm 83 depending from a fixing member such as the support bracket 2 via a shaft 83a, and the sub-pressurization unit 88 is connected to the front end 87B of the sub-pressure application arm 87. Is provided. The sub-pressurizing portion 88 is a plate shape whose base end 88A is coupled to the distal end portion 87B of the sub-pressurizing application arm 87 and extends in the direction of the central axis L, and allows the distal end 88B to penetrate the fixed side electrode 15. A concave portion 88C is formed.

このように構成された副加圧部移動機構８０を備えた副加圧部８８の作動を説明する。   The operation of the sub pressure unit 88 including the sub pressure unit moving mechanism 80 configured as described above will be described.

副加圧部８８の先端８８Ｂが固定側電極１５の頂端１５ａより下方となる退避位置においては、サーボモータ３２の作動によりシャフト３５が上昇すると、支持アーム８３の先端の軸８３ａを支点として副加圧アーム８３が上方に揺動して副加圧部８８が上昇して先端８８Ｂが固定電極１５と可動側電極２５とによって挟持加圧された被溶接部材に当接する副加圧位置に移動する。更にサーボモータ３２の作動によりシャフト３５が上昇することで、更に支持アーム８３の先端の軸８３ａを支点として副加圧付与アーム８７が上方に揺動して副加圧部８８の先端８８Ｂが中心軸線Ｌから離反して副加圧部８８を仮想線８８ａで示すようにスポット作動領域Ａから退避する後退位置に移動する。   In the retracted position where the tip 88B of the sub-pressurizing portion 88 is below the top end 15a of the fixed electrode 15, when the shaft 35 is raised by the operation of the servo motor 32, the shaft 83a at the tip of the support arm 83 is used as a fulcrum. The pressure arm 83 swings upward, the sub-pressurizing portion 88 rises, and the tip 88B moves to a sub-pressurizing position where it comes into contact with the member to be welded and pressed by the fixed electrode 15 and the movable electrode 25. . Further, when the shaft 35 is raised by the operation of the servo motor 32, the auxiliary pressure applying arm 87 is further swung upward with the shaft 83a at the tip of the support arm 83 as a fulcrum, and the tip 88B of the auxiliary pressure part 88 is centered. The auxiliary pressure member 88 moves away from the axis L to a retracted position where it is retracted from the spot operating area A as indicated by a virtual line 88a.

一方、副加圧部８８がスポット作動領域Ａから退避した後退位置において、サーボモータ３２の作動によりシャフト３５を下降移動すると支持アーム８３の先端の軸８３ａを支点として副加圧付与アーム８７が下方に揺動して副加圧部８８が作動領域に復帰する。   On the other hand, when the shaft 35 is moved downward by the operation of the servo motor 32 in the retracted position where the sub pressure unit 88 is retracted from the spot operation region A, the sub pressure application arm 87 is moved downward with the shaft 83a at the tip of the support arm 83 as a fulcrum. And the sub-pressurizing portion 88 returns to the operating region.

なお、本発明は上記各実施の形態に限定されることなく、種々変更可能である。例えば上記各実施の形態では副加圧アクチュエータの作動によりにより副加圧部がスポット作動領域Ａから退避する後退位置に移動せしめるように構成したが、副加圧アクチュエータとは別のアクチュエータを用いて副加圧部がスポット作動領域Ａから退避する後退位置に移動せしめるように構成することもできる。   The present invention is not limited to the above-described embodiments, and various modifications can be made. For example, in each of the above-described embodiments, the sub-pressurization unit is moved to the retracted position retracted from the spot operation area A by the operation of the sub-pressurization actuator. However, an actuator different from the sub-pressurization actuator is used. It can also be configured such that the sub-pressurizing unit is moved to the retracted position where it is retracted from the spot operating area A.

１ スポット溶接装置
１０ 固定アーム
１５ 固定側電極（第１溶接電極）
２０ 加圧アクチュエータ
２１ サーボモータ
２４ 電極アーム
２５ 可動側電極（第２溶接電極）
３０ 副加圧付与手段
３１ 副加圧アクチュエータ
３２ サーボモータ
３５ シャフト
３７、６１、８７ 副加圧付与アーム
３８、５８、６８、７８、８８ 副加圧部
４０、５５、６０、７０、８０ 副加圧部移動機構
４１ 軸回転付与部
４２ ガイド部
４３ 誘導ガイド溝
４７ ガイドローラ（被誘導部）
５７ リンク（副加圧部突出機構）
５９ リンク （副加圧部突出機構）
６４ リンク（副加圧部揺動機構）
７３ 誘導ガイド溝
７１ 副加圧部保持機構
Ｌ 中心軸線
Ａ スポット溶接作動領域 DESCRIPTION OF SYMBOLS 1 Spot welding apparatus 10 Fixed arm 15 Fixed side electrode (1st welding electrode)
20 Pressurizing actuator 21 Servo motor 24 Electrode arm 25 Movable electrode (second welding electrode)
30 Sub-pressure applying means 31 Sub-pressure actuator 32 Servo motor 35 Shafts 37, 61, 87 Sub-pressure applying arms 38, 58, 68, 78, 88 Sub-pressure units 40, 55, 60, 70, 80 Pressure part moving mechanism 41 Shaft rotation imparting part 42 Guide part 43 Guide guide groove 47 Guide roller (guided part)
57 Link (sub pressurizing part protruding mechanism)
59 Link (Sub-pressurizing part protruding mechanism)
64 links (sub-pressurizing part swing mechanism)
73 Guide Guide Groove 71 Sub Pressurizing Part Holding Mechanism L Center Axis A Spot Welding Operation Area

Claims (9)

第１溶接電極と、
加圧アクチュエータの作動によって中心軸線に沿って該第１溶接電極と対向配置されて第１溶接電極から離反する退避位置と前記第１溶接電極と協働して被溶接部材を挟持して加圧する加圧位置とを移動する第２溶接電極と、
副加圧アクチュエータによって前記中心軸線の延在方向と平行に移動するシャフトの先端に副加圧部が配置され、前記副加圧アクチュエータの作動により副加圧部が前記被溶接部材に前記第１溶接電極に隣接して当接して該被溶接部材に副加圧力を付与する副加圧位置及び被溶接部材から離反する退避位置に移動する副加圧付与手段とを備え、
前記被溶接部材に当接する第１溶接電極及び副加圧位置における副加圧部と前記第１溶接電極に対向して前記被溶接部材に当接する第２溶接電極とによって前記被溶接部材を挟持加圧し、該挟持加圧状態で前記第１溶接電極と第２溶接電極との間で通電してスポット溶接するスポット溶接装置であって、
前記副加圧部をスポット作動領域から退避する後退位置に移動せしめる副加圧部移動機構を備えたことを特徴とするスポット溶接装置。 A first welding electrode;
The member to be welded is clamped and pressed in cooperation with the first welding electrode and a retracted position that is opposed to the first welding electrode along the central axis by the operation of the pressurizing actuator and is separated from the first welding electrode. A second welding electrode that moves between the pressurization positions;
A sub-pressurizing portion is disposed at the tip of the shaft that is moved in parallel with the extending direction of the central axis by the sub-pressurizing actuator, and the sub-pressurizing portion is attached to the welded member by the operation of the sub-pressurizing actuator. A sub-pressurization position that abuts adjacent to the welding electrode and applies a sub-pressurizing force to the member to be welded, and a sub-pressurization applying means that moves to a retracted position away from the member to be welded,
The member to be welded is sandwiched between the first welding electrode that contacts the member to be welded, the sub-pressurizing portion at the sub-pressurizing position, and the second welding electrode that contacts the member to be welded so as to face the first welding electrode. A spot welding apparatus that pressurizes and performs spot welding by energizing between the first welding electrode and the second welding electrode in the sandwiched pressure state,
A spot welding apparatus, comprising: a sub-pressurizing part moving mechanism that moves the sub-pressurizing part to a retracted position for retracting from the spot operating region. 前記副加圧部移動機構は、前記副加圧アクチュエータにより前記副加圧部が移動する退避位置と副加圧位置との作動領域から移動した際に、前記副加圧部をスポット作動領域から退避する後退位置に移動せしめることを特徴とする請求項１に記載のスポット溶接装置。 The auxiliary pressing movement mechanism, when the said sub-pressure portion by the auxiliary pressure Actuator error over data is moved from the working region of the retracted position and the auxiliary pressing position moving spot the sub pressurizing The spot welding apparatus according to claim 1, wherein the spot welding apparatus is moved to a retracted position for retracting from the operating region. 前記副加圧部移動機構は、前記副加圧アクチュエータによる前記シャフトの移動により前記副加圧部が移動する退避位置と副加圧位置との作動領域から移動した際に、前記副加圧部をスポット作動領域から退避する後退位置に移動せしめることを特徴とする請求項１または２に記載のスポット溶接装置。 The auxiliary pressing movement mechanism upon movement from the working region of the retracted position and the auxiliary pressing position where the secondary pressure portion by the movement of the shaft by the auxiliary pressure Actuator error over data is moved, the sub The spot welding apparatus according to claim 1 or 2, wherein the pressurizing unit is moved to a retracted position for retracting from the spot operating region. 前記副加圧部移動機構は、
前記シャフトが貫通して内周に誘導ガイド溝を有するガイド部と、
前記シャフトに設けられて前記誘導ガイド溝に移動可能に嵌合する被誘導部とを備え、
前記副加圧アクチュエータによる前記シャフトの移動により前記ガイド部の誘導ガイド溝内を移動する前記被誘導部によって副加圧部が移動する退避位置と副加圧位置との作動領域から移動した際に前記シャフトに回動付与されて前記副加圧部がスポット作動領域から退避する後退位置に移動することを特徴とする請求項３に記載のスポット溶接装置。 The sub-pressurizing part moving mechanism is
A guide portion through which the shaft passes and having a guide guide groove on the inner periphery;
A guided portion provided on the shaft and movably fitted in the guide guide groove;
When the sub-pressurizing part moves in the guide guide groove of the guide part by the movement of the shaft by the sub-pressurizing actuator when the sub-pressurizing part moves from the operating region between the retreat position and the sub-pressurizing position. The spot welding apparatus according to claim 3, wherein the shaft is pivotally applied to move the sub-pressurizing portion to a retreat position where the sub-pressurizing portion is retracted from the spot operation region. 前記副加圧部移動機構は、
前記シャフトに配置されて前記副加圧部を該シャフトの回動に連動して上記中心軸線に接離せしめる副加圧部突出機構と、
前記シャフトが貫通して内周に誘導ガイド溝を有するガイド部と、
前記シャフトに設けられて前記誘導ガイド溝に移動可能に嵌合する被誘導部とを備え、
前記副加圧アクチュエータによる前記シャフトの移動により前記ガイド部の誘導ガイド溝内を移動する前記被誘導部によって副加圧部が移動する退避位置と副加圧位置との作動領域から移動した際に前記シャフトに回動付与され、副加圧部突出機構によって前記副加圧部がスポット作動領域から退避する後退位置に移動することを特徴とする請求項３に記載のスポット溶接装置。 The sub-pressurizing part moving mechanism is
A sub-pressurizing part projecting mechanism disposed on the shaft and moving the sub-pressurizing part to and away from the central axis in conjunction with rotation of the shaft;
A guide portion through which the shaft passes and having a guide guide groove on the inner periphery;
A guided portion provided on the shaft and movably fitted in the guide guide groove;
When the sub-pressurizing part moves in the guide guide groove of the guide part by the movement of the shaft by the sub-pressurizing actuator when the sub-pressurizing part moves from the operating region between the retreat position and the sub-pressurizing position. The spot welding apparatus according to claim 3, wherein the spot pressing device is pivotally applied to the shaft and is moved to a retracted position in which the sub pressure member is retracted from the spot operation region by a sub pressure member protruding mechanism. 前記副加圧部移動機構は、
前記シャフトの先端に回動自在に支持された副加圧付与アームの先端に副加圧部が揺動自在に支持され、
前記シャフトに配置されて前記副加圧部を該シャフトの回動に連動して副加圧部を揺動せしめる副加圧部揺動機構と、 前記シャフトが貫通して内周に誘導ガイド溝を有するガイド部と、
前記シャフトに設けられて前記誘導ガイド溝に移動可能に嵌合する被誘導部とを備え、
前記副加圧アクチュエータによる前記シャフトの移動により前記ガイド部の誘導ガイド溝内を移動する前記被誘導部によって副加圧部が移動する退避位置と副加圧位置との作動領域から移動した際に前記シャフトに回動付与され、副加圧部揺動機構によって前記副加圧部が揺動してスポット作動領域から退避する後退位置に移動することを特徴とする請求項３に記載のスポット溶接装置。 The sub-pressurizing part moving mechanism is
Tip FukuKa pressure section of the secondary pressure imparting arm which is rotatably supported on the tip of the shaft is swingably supported,
A sub-pressurizing part swinging mechanism disposed on the shaft and swinging the sub-pressurizing part in conjunction with the rotation of the shaft; and a guide guide groove on the inner periphery through the shaft. A guide portion having
A guided portion provided on the shaft and movably fitted in the guide guide groove;
When the sub-pressurizing part moves in the guide guide groove of the guide part by the movement of the shaft by the sub-pressurizing actuator when the sub-pressurizing part moves from the operating region between the retreat position and the sub-pressurizing position. 4. The spot welding according to claim 3, wherein the shaft is pivotally imparted and moved to a retreat position where the sub pressure member is swung by the sub pressure member rocking mechanism and retracted from the spot operating region. apparatus. 前記副加圧部移動機構は、
前記シャフトに配置されて先端が上記中心軸線に接離する方向に移動自在に保持する副加圧部保持機構と、
固定部材に形成されて副加圧部に設けられた被誘導部が移動可能に嵌合する誘導ガイド溝を備え、
前記副加圧アクチュエータによる前記シャフトの移動により誘導ガイド溝内を移動する前記被誘導部によって副加圧部が移動する退避位置と副加圧位置との作動領域から移動した状態で副加圧部がスポット作動領域から退避する後退位置に移動することを特徴とする請求項３に記載のスポット溶接装置。 The sub-pressurizing part moving mechanism is
A sub-pressurizing portion holding mechanism that is arranged on the shaft and that is movably held in a direction in which the tip is in contact with and away from the central axis;
A guide guide groove formed on the fixing member and fitted to the guided portion movably fitted to the sub-pressurizing unit;
The sub-pressurizing unit is moved from the retracted position where the sub-pressurizing unit moves by the guided portion that moves in the guide guide groove by the movement of the shaft by the sub-pressurizing actuator and the sub-pressing position. The spot welding apparatus according to claim 3, wherein the spot is moved to a retracted position where the spot is retracted from the spot operating region. 前記副加圧部移動機構は、
前記シャフトの先端に中央部が回動自在に支持され先端に副加圧部を支持すると共に後端が固定部材に回動自在に支持された副加圧付与アームを備え、
前記副加圧アクチュエータによる前記シャフトの移動によって揺動移動する副加圧部が退避位置と副加圧位置との作動領域から移動した際に前記副加圧部がスポット作動領域から退避する後退位置に移動することを特徴とする請求項３に記載のスポット溶接装置。 The sub-pressurizing part moving mechanism is
A center portion is rotatably supported at the tip of the shaft, and a sub-pressure applying arm is supported at the tip and a sub-pressurizing portion is supported by the fixing member.
A retreat position in which the sub-pressurization unit retreats from the spot operation region when the sub-pressurization unit that swings by the movement of the shaft by the sub-pressurization actuator moves from the operation region between the retreat position and the sub-pressurization position. The spot welding apparatus according to claim 3, wherein 前記副加圧部移動機構は、前記副加圧アクチュエータとは別のアクチュエータにより前記副加圧部をスポット作動領域から退避する後退位置に移動せしめることを特徴とする請求項１に記載のスポット溶接装置。 The auxiliary pressing movement mechanism according to claim 1, characterized in that for moving the retracted position to retract the sub-pressurizing with another actuator and the secondary pressure Actuator error over data from the spot working area Spot welding equipment.
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