EP0426689A1 - Device for actuating the welding electrode or tongs of resistance welding machines - Google Patents

Device for actuating the welding electrode or tongs of resistance welding machines

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Publication number
EP0426689A1
EP0426689A1 EP19890906749 EP89906749A EP0426689A1 EP 0426689 A1 EP0426689 A1 EP 0426689A1 EP 19890906749 EP19890906749 EP 19890906749 EP 89906749 A EP89906749 A EP 89906749A EP 0426689 A1 EP0426689 A1 EP 0426689A1
Authority
EP
European Patent Office
Prior art keywords
welding
cylinder
spindle
piston
threaded
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP19890906749
Other languages
German (de)
French (fr)
Inventor
Ferdinand Schwob
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0426689A1 publication Critical patent/EP0426689A1/en
Withdrawn legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00Resistance welding; Severing by resistance heating
    • B23K11/30Features relating to electrodes
    • B23K11/31Electrode holders and actuating devices therefor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00Resistance welding; Severing by resistance heating
    • B23K11/30Features relating to electrodes
    • B23K11/31Electrode holders and actuating devices therefor
    • B23K11/311Electrode holders and actuating devices therefor the actuating device comprising an electric motor

Definitions

  • the invention relates to a device for actuating the welding head or the welding gun of resistance welding devices in automatic welding machines, robots or the like.
  • Program-controlled welding devices according to the preamble of claim 1.
  • welding drives of resistance welding devices consist of hydraulic or pneumatic cylinder arrangements or mechanical spring force drives. They have proven themselves essentially well, but they require considerable construction effort. only little variability in view of the fact that with them - about.
  • Use of a gun welder - both the preliminary stroke as well as the working stroke as well as the repositioning necessary in the welding phase must be carried out.
  • hydraulic double cylinders or so-called pneumo-hydraulic power packs are known, in which, for example, a hydraulic cylinder which is designed to carry out the working stroke is arranged in the piston of a pneumatic cylinder which is used to carry out the forward stroke.
  • these cylinder arrangements have the particular disadvantage that they are fixed to a pre-stroke once selected, which, although used for another purpose, cannot be exceeded in any case - without constructive intervention in the cylinder arrangement .
  • these cylinder arrangements have the further disadvantage that a path interruption which delays the workflow occurs between the forward stroke and the working stroke when retracting and extending.
  • system-inherent disadvantages such as - in water-hydraulic systems - aggressiveness of the hydraulic medium towards valves and - this also applies to oil-hydraulic systems - considerable damage, especially in welding equipment, if leakages occur.
  • the present invention has for its object to provide a structurally simple and easily controllable device of the type described. This problem is solved by a device with the features set out in claims 1 and 2.
  • the drive according to the invention is structurally simple and allows an infinitely variable adjustment of both the preliminary stroke and the working stroke, changes in the preliminary stroke generally not being subject to an upper limit and requiring no intervention in the system. It is not necessary to interrupt the path after executing the preliminary stroke in the course of the first starting stroke.
  • the control is simple, and the pressure, particularly in the tracking phase, can be regulated in a simple manner by means of a torque regulator. The need to supply three energy sources (air, hydraulics, electricity) and the resulting installation effort are eliminated, the entire operation is carried out with one energy source, and there are also no leakages in impairments and hazards that occur in the liquid lines.
  • FIG. 1 shows an embodiment of a device for actuating
  • FIG. 2 shows another embodiment of an actuating device according to the invention in section.
  • Fig. 3 is a schematic representation of another embodiment of the invention.
  • Welding devices consists of a cylinder 1 fixed to the frame, to which one of the two gun arms is fastened, for example when welding guns are actuated, and a guided in the cylinder 1 fixed to the welding electrode. the other arm of the welding gun connected piston 2.
  • the piston 2 is designed as a sleeve open on one side for receiving a spindle drive actuated by an electromotive drive, the thread drive 3 in the case of the embodiment shown in FIG. 1 rigid in the with. the welding electrode. attached to the actuated arm of the welding gun, in the cylinder 1 axially movably guided piston 2 and its in the cylinder 1 rotatably mounted threaded spindle 5 is connected to an electric motor drive 7.
  • the threaded sleeve 8 is connected in a rotationally fixed manner to the rotor of the electromotive drive 7 and the threaded spindle 9 is rigidly connected to the piston 2 axially guided in the cylinder 19, whereby Expediently, the thread guide 8 forms part of the rotor. is made in one piece with this.
  • the welding cylinder is formed by an electronically commutated three-phase motor with an integrated rotor position system - housing 11, winding 12 - in which the motor shaft 13 is designed as a hollow shaft with a fixed, connected spindle nut 14 and by means of an axial-radial bearing 15 is mounted in a bearing receiving flange 16.
  • the spindle drive is formed by a so-called "planetary roller spindle", on the spindle 17 of which the axially guided, i.e. pressure plate 18 secured against rotation is attached.
  • the arrangement is such that the spindle 17 - for example by means of a guide pin (not shown) arranged on the pressure plate 18 and projecting into the bearing mounting flange 16 - is secured against rotation with the pressure plate 18.
  • This embodiment of a welding cylinder according to the invention is a closed, structurally extremely simple ches system in which the pressure plate is acted upon directly by the motor shaft without the interposition of a transmission or other power transmission device.
  • the device is therefore also structurally extremely simple and wear-resistant and, unlike the known devices, requires a considerably reduced installation space while also reducing the energy requirement by up to 80%. It also enables the free determination of the stroke lengths for the pre-stroke and working stroke when the electrode is placed gently on the workpiece, in view of the fact that the full torque, which determines the contact pressure, only builds up continuously after the electrode has been placed on. As a result, there is also a considerable increase in the service life of the electrodes and a reduction in noise.
  • the contact pressure-determining torque is automatically readjusted to the specified target value during the welding process, so that the softening of the welding point and the operational electrode burn-off occurring during the welding process are automatically compensated.
  • the commutated three-phase motor is advantageously preceded by a control element which, given the desired contact pressure and the desired speed-dependent stroke speed, regulates the motor current required for the torque to be applied and controls the welding control after the torque has been reached.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Resistance Welding (AREA)

Abstract

Dispositif de commande d'une électrode de soudage ou d'une pince de soudage dans des appareils de soudage par résistance appartenant à des machines automatiques de soudage, robots ou installations analogues de soudage, comprenant un cylindre monté à demeure sur un bâti, et un piston guidé dans ledit cylindre et relié à l'électrode de soudage ou au bras de commande de la pince de soudage, dispositif dans lequel le piston (2) est formé par un manchon ouvert d'un côté, en vue de recevoir un mécanisme d'entraînement d'une broche comprenant un manchon taraudé (3) et une broche filetée (5) et commandé par un moteur électrique. Le manchon taraudé (3) est fixé rigidement dans le piston (2) guidé axialement à l'intérieur du cylindre (1) et relié à l'électrode de soudage, cependant que la broche filetée (5) montée en rotation dans le cylindre (1) est reliée à une commande électrique (7). Le cylindre de soudage est formé par un moteur triphasé à commutation électronique avec système de palier-rotor intégré, dans lequel l'arbre-moteur est constitué par un arbre creux à écrou à manchon à liaison rigide et est monté au moyen d'un palier axial-radial dans une bride d'appui du palier.Control device for a welding electrode or a welding clamp in resistance welding apparatus belonging to automatic welding machines, robots or similar welding installations, comprising a cylinder permanently mounted on a frame, and a piston guided in said cylinder and connected to the welding electrode or to the control arm of the welding gun, device in which the piston (2) is formed by a sleeve open on one side, in order to receive a mechanism for drive of a spindle comprising a threaded sleeve (3) and a threaded spindle (5) and controlled by an electric motor. The threaded sleeve (3) is rigidly fixed in the piston (2) guided axially inside the cylinder (1) and connected to the welding electrode, while the threaded pin (5) rotatably mounted in the cylinder ( 1) is connected to an electrical control (7). The welding cylinder is formed by a three-phase electronically commutated motor with integrated rotor-bearing system, in which the motor shaft is constituted by a hollow shaft with a nut with a rigid connection sleeve and is mounted by means of a bearing. axial-radial in a bearing support flange.

Description

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Einrichtung zur Betätigung der Schweißelektrode oder Schweißzange von Widerstandsschweißgeräten -------------------------------------------------------------------- Device for actuating the welding electrode or welding gun of resistance welding devices ----------------------------------------- ---------------------------
Die Erfindung geht aus von einer Einrichtung zur Betätigung des Schweißkopfes oder der Schweißzange von Widerstandsschweißgeräten in Schweißautomaten, Robotern oder dergl. programmgesteuerten Schweißeinrichtungen gemäß dem Oberbegriff des Patentanspruches 1. The invention relates to a device for actuating the welding head or the welding gun of resistance welding devices in automatic welding machines, robots or the like. Program-controlled welding devices according to the preamble of claim 1.
Schweißantriebe von Widerstandsschweißeräten bestehen bisher aus hydraulischen oder pneumatischen Zylinderanordnungen oder mechanischen Federkraft-Antrieben. Sie haben sich im wesentlichen gut bewährt, sie erfordern jedoch einen erheblichen konstruktiven Aufwand bei. nur geringer Variabilität im Hinblick darauf, daß mit ihnen - etwa bei. Einsatz eines Zangenschweißgerätes - sowohl der Vorhub, als auch der Arbeitshub sowie auch das in der Schweißphase notwendige Nachsetzen bewerkstelligt werden muß. Zu diesem Zweck sind etwa hydraulische Doppelzylinder oder sog. pneumo-hydraulische Kraftpakete bekannt, bei denen etwa in dem Kolben eines zur Ausführung des Vorhubes dienenden Pneumatikzylinders ein zur Ausführung des Arbeitshubes bestimmter hydraulischen Zylinders angeordnet ist. Abgesehen von dem erheblichen konstruktiven Aufwand weisen diese Zylinderanordnungen insbesondere den Nachteil auf, daß sie auf einen einmal gewählten Vorhub festgelegt, sind, der zwar bei Einsatz für einen anderen Zweck unterschritten, in keinem Falle jedoch - ohne konstruktiven Eingriff in die Zylinderanordnung - überschritten werden kann. Darüberhinaus weisen diese Zylinderanordnungen - abgesehen von dem erforderlichen erheblichen Steuerungsaufwand - den weiteren Nachteil auf, daß jeweils zwischen dem Vorhub und dem Arbeitshub beim Einfahren und dem Ausfahren eine den Arbeitsablauf verzögernde Wegeunterbrechung eintritt. Hinzu kommen die hydraulischen Zylinderanordnungen systemimmanenten Nachteile, etwa der - bei wasserhydraulischen Anlagen - Aggresivität des Hydraulikmediums gegenüber Ventilen und der - dies gilt ebenfalls für ölhydraulische Anlagen - gerade in Schweißeinrichtungen erheblichen Schädigungen im Falle des Auftretens von Leckagen. So far, welding drives of resistance welding devices consist of hydraulic or pneumatic cylinder arrangements or mechanical spring force drives. They have proven themselves essentially well, but they require considerable construction effort. only little variability in view of the fact that with them - about. Use of a gun welder - both the preliminary stroke as well as the working stroke as well as the repositioning necessary in the welding phase must be carried out. For this purpose, for example, hydraulic double cylinders or so-called pneumo-hydraulic power packs are known, in which, for example, a hydraulic cylinder which is designed to carry out the working stroke is arranged in the piston of a pneumatic cylinder which is used to carry out the forward stroke. In addition to the considerable design effort, these cylinder arrangements have the particular disadvantage that they are fixed to a pre-stroke once selected, which, although used for another purpose, cannot be exceeded in any case - without constructive intervention in the cylinder arrangement . In addition to the considerable control effort required, these cylinder arrangements have the further disadvantage that a path interruption which delays the workflow occurs between the forward stroke and the working stroke when retracting and extending. Added to this are the hydraulic cylinder arrangements, system-inherent disadvantages, such as - in water-hydraulic systems - aggressiveness of the hydraulic medium towards valves and - this also applies to oil-hydraulic systems - considerable damage, especially in welding equipment, if leakages occur.
Der vorliegenden Erfindung liegt als Aufgabe die Schaffung einer konstruktiv einfachen und leicht steuerbaren Einrichtung der beschriebenen Art zugrunde. Biese Aufgabe wird durch eine Einrichtung mit den in den Patentansprüchen 1 und 2 wiedergegebenen Merkmalen gelöst. The present invention has for its object to provide a structurally simple and easily controllable device of the type described. This problem is solved by a device with the features set out in claims 1 and 2.
Der erfindungsgemäße Antrieb ist konstruktiv einfach und erlaubt eine stufenlose Einstellung sowohl des Vorhubes als auch des Arbeitshubes, wobei Änderungen des Vorhubes gundsätzlich keiner Begrenzung nach oben unterliegen und keinen Eingriff in das System erforderlich machen. Eine Wegeunterbrechung nach Ausführung des Vorhubes im Verlauf des ersten Anfahrhubes ist nicht erforderlich. Die Steuerung ist einfach, wobei der Andruck insbesondere in der Nachführphase auf einfache Weise mittels Drehmomentenregl er geregelt werden kann. Die Notwendigkeit der Zuführung von teilweise drei Energiequellen (Luft, Hydraulik, Elektrizität) und der hierdurch begründete Installationsaufwand entfallen, der gesamte Betrieb erfolgt mit einer Energiequelle, ebenso entfallen die durch Leckagen in den Flüssigkeitsleitungen auftretenden Beeinträchtigungen und Gefährdungen. The drive according to the invention is structurally simple and allows an infinitely variable adjustment of both the preliminary stroke and the working stroke, changes in the preliminary stroke generally not being subject to an upper limit and requiring no intervention in the system. It is not necessary to interrupt the path after executing the preliminary stroke in the course of the first starting stroke. The control is simple, and the pressure, particularly in the tracking phase, can be regulated in a simple manner by means of a torque regulator. The need to supply three energy sources (air, hydraulics, electricity) and the resulting installation effort are eliminated, the entire operation is carried out with one energy source, and there are also no leakages in impairments and hazards that occur in the liquid lines.
Weitere Ausführungsformen und Vorteile ergeben sich aus der nachfolgenden Beschreibung, in der die Erfindung anhand der beiliegenden Zeichnungen beispielsweise erläutert ist. Es zeigen Fig. 1 eine Ausführungsform einer Einrichtung zur Betätigung von Further embodiments and advantages emerge from the following description, in which the invention is explained for example with reference to the accompanying drawings. 1 shows an embodiment of a device for actuating
Schweißelektroden bezw. Schweißzangen im Schnitt Fig. 2 eine andere Ausführungsform einer erfindungsgemäßen Betätigungseinrichtung im Schnitt.  Welding electrodes resp. Welding guns in section. Fig. 2 shows another embodiment of an actuating device according to the invention in section.
Fig. 3 eine schematische Wiedergabe einer anderen Ausführungsform der Erfindung  Fig. 3 is a schematic representation of another embodiment of the invention
Die in Fig. 1 der Zeichnung wiedergegebene Einrichtung zur Betätigung der Schweißelektrode oder der Schweißzange von Widerstandsschweißgeräten in Schweißautomaten, Robotern oder dergl . Schweißeinrichtungen besteht aus einem gestellfesten Zylinder 1, an dem etwa bei Betätigung von Schweißzangen der eine der beiden Zangenarme befestigt ist, sowie einem in dem gestellfesten Zylinder 1 geführten, mit der Schweißelektrode bezw. dem anderen Arm der Schweißzange verbundenen Kolben 2. Der Kolben 2 ist als einseitig offene Hülse zur Aufnahme eines von einem elektromotorischen Antrieb betätigten Spindeltriebes ausgebildet, dessen Gewinderauffe 3 im Falle der in Fig. 1 wiedergegebenen Ausführungsform starr in dem mit. der Schweißelektrode bezw. dem betätigten Arm der Schweißzange verbundenen, in dem Zylinder 1 axial beweglich geführten Kolben 2 befestigt und dessen in dem Zylinder 1 drehbar gelagerte Gewindespindel 5 mit einem elektromotorischen Antrieb 7 verbunden ist. The device shown in Fig. 1 of the drawing for actuating the welding electrode or the welding gun of resistance welding devices in automatic welding machines, robots or the like. Welding devices consists of a cylinder 1 fixed to the frame, to which one of the two gun arms is fastened, for example when welding guns are actuated, and a guided in the cylinder 1 fixed to the welding electrode. the other arm of the welding gun connected piston 2. The piston 2 is designed as a sleeve open on one side for receiving a spindle drive actuated by an electromotive drive, the thread drive 3 in the case of the embodiment shown in FIG. 1 rigid in the with. the welding electrode. attached to the actuated arm of the welding gun, in the cylinder 1 axially movably guided piston 2 and its in the cylinder 1 rotatably mounted threaded spindle 5 is connected to an electric motor drive 7.
Bei der in Fig. 2 der Zeichnung wiedergegebenen Ausführungsform der Betätigungseinrichtung sind in kinematischer Umkehrung der Ausführungsform nach Fig. 1 die Gewindemuffe 8 drehfest mit dem Rotor des elektromotorischen Antriebes 7 und die Gewindespindel 9 starr mit dem im Zylinder 19 axial geführten Kolben 2 verbunden, wobei zweckmäßigerweise die Gewinderauffe 8 einen Teil des Rotors bildet bezw. aus einem Stück mit diesem hergestellt ist. In the embodiment of the actuating device shown in FIG. 2 of the drawing, in a kinematic reversal of the embodiment according to FIG. 1, the threaded sleeve 8 is connected in a rotationally fixed manner to the rotor of the electromotive drive 7 and the threaded spindle 9 is rigidly connected to the piston 2 axially guided in the cylinder 19, whereby Expediently, the thread guide 8 forms part of the rotor. is made in one piece with this.
Bei der in Fig. 3 wiedergegebenen Ausführungsform der Erfindung ist der Schweißzyinder von einem elektronisch commutierten Drehstrommotor mit integriertem Rotor-Lage-System - Gehäuse 11, Wicklung 12 - gebildet, bei dem die Motorwelle 13 als Hohlwelle mit fest, verbundener Spindelmutter 14 ausgebildet und mittels eines Axial-Radial-Lagers 15 in einem Lageraufnahmeflansch 16 gelagert ist. Der Spindeltrieb ist von einer sog. "Planetenroll-Spindel" gebildet, an deren Spindel 17 die axial geführte, d.h. gegen Drehung gesicherte Andruckplatte 18 befestigt ist. Hierbei ist die Anordnung so getroffen, daß die Spindel 17 - beispielsweise mittels eines an der Andruckplatte 18 angeordneten und in den Lageraufnahmeflansch 16 einragenden Führungsstift (nicht dargestellt) - mit der Andruckplatte 18 gegen Drehung gesichert ist. In the embodiment of the invention shown in FIG. 3, the welding cylinder is formed by an electronically commutated three-phase motor with an integrated rotor position system - housing 11, winding 12 - in which the motor shaft 13 is designed as a hollow shaft with a fixed, connected spindle nut 14 and by means of an axial-radial bearing 15 is mounted in a bearing receiving flange 16. The spindle drive is formed by a so-called "planetary roller spindle", on the spindle 17 of which the axially guided, i.e. pressure plate 18 secured against rotation is attached. Here, the arrangement is such that the spindle 17 - for example by means of a guide pin (not shown) arranged on the pressure plate 18 and projecting into the bearing mounting flange 16 - is secured against rotation with the pressure plate 18.
Bei dieser Ausführungsform eines erfindungsgemäßen Schweißzylinders handelt es sich um ein geschlossenes, konstruktiv außerordentlich einfa ches System, bei dem die Andruckplatte ohne Zwischenschaltung eines Getriebes oder einer anderen Kraftübertragungseinrichtung direkt von der Motorwelle beaufschlagt wird. Die Einrichtung ist daher auch konstruktiv außerordentlich einfach und verschleißarm unb benötigt gegenüber den bekannten Einrichtungen einen erheblich verringerten Einbauraum bei ebenfalls Verringerung des Energiebedarfes um bis zu 80%. Sie ermöglicht weiterhin die freie Bestimmung der Hublängen für den Vor- und Arbeitshub bei weichem Aufsetzen der Elektrode auf dem Werkstück im Hinblick darauf, daß das sich das - die Anpreßkraft bestimmende - volle Drehmoment erst kontinuierlich nach dem Aufsetzen der Elektrode aufbaut. Es ergibt sich infolgedessen auch eine erhebliche Verlängerung der Standzeit der Elektroden sowie Verminderung der Geräuschentwicklung. Als ein weiterer wesentlicher Vorteil der Einrichtung der Erfindung tritt gegenüber den bekannten Einrichtungen darüberhinaus eine wesentliche Verbesserung der Schweißqualität ein im Hinblick darauf, daß sich das die Schweißkraft bezw. der Anpreßdruck bestimmende Drehmoment auch während des Schweißvorganges selbsttätig auf den vorgegebenen Sollwert nachregelt, so daß die beim Schweißvorgang eintretende Erweichung des Schweißpunktes und der betriebsbedingte Elektrodenabbrand selbsttätig kompensiert werden. This embodiment of a welding cylinder according to the invention is a closed, structurally extremely simple ches system in which the pressure plate is acted upon directly by the motor shaft without the interposition of a transmission or other power transmission device. The device is therefore also structurally extremely simple and wear-resistant and, unlike the known devices, requires a considerably reduced installation space while also reducing the energy requirement by up to 80%. It also enables the free determination of the stroke lengths for the pre-stroke and working stroke when the electrode is placed gently on the workpiece, in view of the fact that the full torque, which determines the contact pressure, only builds up continuously after the electrode has been placed on. As a result, there is also a considerable increase in the service life of the electrodes and a reduction in noise. As a further essential advantage of the device of the invention, compared to the known devices, there is also a substantial improvement in the welding quality with regard to the fact that the welding force is related. the contact pressure-determining torque is automatically readjusted to the specified target value during the welding process, so that the softening of the welding point and the operational electrode burn-off occurring during the welding process are automatically compensated.
Vorteilhaft ist dem commutierten Drehstrommotor ein Steuerglied vorgeschaltet ist, das unter Vorgabe der gewünschten Anpreßkraft und der gewünschten - drehzahlabhängigen - Hubgschwindigkeit den für das aufzubringende Drehmoment erforderlichen Motorstrom regelt und nach Erreichen des Drehmomentes die Schweißsteuerung ansteuert. The commutated three-phase motor is advantageously preceded by a control element which, given the desired contact pressure and the desired speed-dependent stroke speed, regulates the motor current required for the torque to be applied and controls the welding control after the torque has been reached.

Claims

Patentansprüche Claims
1. Einrichtung zur Betätigung der Schweißelektrode oder Schweißzange von Widerstandsschweißgeräten in Schweißautomaten, Robotern oder dergl. Schweißeinrichtungen, bestehend aus einem gestellfesten Zylinder (1) und einem in dem gestellfesten Zylinder (1) geführten, mit der Schweißelektrode bezw. dem betätigten Arm der Schweißzange verbundenen Kolben (2), dadurch gekennzeichnet, daß der Kolben (2) als einseitig offene Hülse zur Aufnahme eines von einem elektromotorischen Antri eb betätigten, aus einer Gewindemuffe (3) und einer Gewindespindel (5) bestehenden Spindeltriebes ausgebildet ist. 1. Device for actuating the welding electrode or welding gun of resistance welding devices in automatic welding machines, robots or the like. Welding devices, consisting of a frame-fixed cylinder (1) and one in the frame-fixed cylinder (1), with the welding electrode. the actuated arm of the welding gun connected piston (2), characterized in that the piston (2) is designed as a sleeve open on one side for receiving an actuated by an electromotive drive eb, consisting of a threaded sleeve (3) and a threaded spindle (5) consisting of a spindle drive .
2. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Gewindemuffe (3) starr in dem mit der Schweißelektrode bezw. dem betätigten Arm der Schweißzange verbundenen, in dem Zylinder (1) axialbeweglich geführten Kolben (2) befestigt und die in dem Zylinder (1) drehbar gelagerte Gewindespindel (5) mit einem elektromotorischen Antrieb (7) verbunden sind. 2. Device according to claim 1, characterized in that the threaded sleeve (3) rigidly in the bezw with the welding electrode. attached to the actuated arm of the welding gun, in the cylinder (1) axially movably guided piston (2) and the threaded spindle (5) rotatably mounted in the cylinder (1) are connected to an electromotive drive (7).
3. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Gewindemuffe (8) drehfest mit dem Rotor des elektromotorischen Antriebes (7) und die Gewindespindel (9) starr mit dem im Zylinder (1) axial geführten Kolben (2) verbunden sind. 3. Device according to claim 1, characterized in that the threaded sleeve (8) rotatably with the rotor of the electromotive drive (7) and the threaded spindle (9) are rigidly connected to the piston (2) axially guided in the cylinder (1).
4. Einrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der Schweißzyinder von einem elektronisch commutierten Drehstrommotor (11, 12) mit integriertem Rotor-Lage-System gebildet ist, bei dem die Motorwelle (13) als Hohlwelle mit fest verbundener Spindelmutter (14) ausgebildet und mittels eines Axial-Radial-Lagers (15) in einem Lageraufnahmeflansch (16) gelagert ist. 4. Device according to one of claims 1 to 3, characterized in that the welding cylinder is formed by an electronically commutated three-phase motor (11, 12) with an integrated rotor position system, in which the motor shaft (13) as a hollow shaft with a firmly connected spindle nut (14) and is mounted in a bearing mounting flange (16) by means of an axial-radial bearing (15).
5. Einrichtung nach Anspruch 4, dadurch gekennzeichnet, daß der Spindeltrieb von einer Planetenroll-Spindel gebildet ist. 5. Device according to claim 4, characterized in that the spindle drive is formed by a planetary roller spindle.
6. Einrichtung nach Anspruch 4 oder 5, dadurch gekennzeichnet, daß die Spindel (17) fest mit einer im Lagerflansch geführten, der Schweißkraftaufbringung auf die nachgeschalteten Elemente dienenden Druckplatte verbunden ist. 6. Device according to claim 4 or 5, characterized in that the spindle (17) is fixedly connected to a guided in the bearing flange, the welding force application to the downstream elements serving pressure plate.
7. Einrichtung nach einem der Ansprüche 4 bis 6, dadurch gekennzeichnet, daß dem commutierten Drehstrommotor ein Steuerglied vorgeschaltet ist, das unter Vorgabe der gewünschten Anpreßkraft und der gewünschten - drehzahlabhängigen - Hubgschwindigkeit den für das aufzubringende Drehmoment erforderlichen Motorstrom regelt und nach Erreichen des Drehmomentes die Schweißsteuerung ansteuert. 7. Device according to one of claims 4 to 6, characterized in that the commutated three-phase motor is connected upstream of a control element which, given the desired contact pressure and the desired speed-dependent stroke speed, regulates the motor current required for the torque to be applied and, after the torque has been reached, the Controls welding control.
EP19890906749 1989-05-30 1989-05-30 Device for actuating the welding electrode or tongs of resistance welding machines Withdrawn EP0426689A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP1989/000600 WO1990014920A1 (en) 1989-05-30 1989-05-30 Device for actuating the welding electrode or tongs of resistance welding machines

Publications (1)

Publication Number Publication Date
EP0426689A1 true EP0426689A1 (en) 1991-05-15

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Family Applications (1)

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EP19890906749 Withdrawn EP0426689A1 (en) 1989-05-30 1989-05-30 Device for actuating the welding electrode or tongs of resistance welding machines

Country Status (3)

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EP (1) EP0426689A1 (en)
FI (1) FI910340A0 (en)
WO (1) WO1990014920A1 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4322496C2 (en) * 1993-07-06 1995-09-07 Somako Hirsch & Attig Gmbh Arrangement for CNC controlled resistance welding
DE4331139A1 (en) * 1993-09-14 1995-03-16 Jaeger Emil Gmbh Co Kg Grid-welding machine with servo-controlled traverse
DE4439833A1 (en) * 1994-11-08 1996-05-09 Wanzl Metallwarenfabrik Kg Method and welding machine provided for carrying out the method for resistance welding of rod-shaped and sheet-shaped semi-finished products
KR19980702351A (en) * 1995-02-21 1998-07-15 마이클 아이. 프로치 Placement and electromagnetic fasteners for welders
DE19738647A1 (en) * 1997-09-04 1999-03-25 Messer Griesheim Schweistechni Resistance pressure welding machine
EP1088614A1 (en) * 1999-09-30 2001-04-04 NIMAK Automatisierte Schweisstechnik GmbH Robot welding gun
EP1221351A1 (en) * 2000-12-08 2002-07-10 Progressive Tool & Industries Company Weld gun with inverted roller screw actuator
DE10300628A1 (en) * 2003-01-10 2004-07-22 Abb Patent Gmbh Plotting of characteristic curve for the electric drive of spot welding tongs, includes closing tongs, with simultaneous introduction of force measuring device

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2844708A (en) * 1957-03-27 1958-07-22 Sidney M Harvey Welding electrode actuator
IT1129148B (en) * 1980-09-05 1986-06-04 Luigi Caprioglio SUPPORT FOR CLAMP FOR ELECTRIC WELDING ROBOT
FR2585976B1 (en) * 1985-08-09 1992-05-15 Aro NUMERICALLY CONTROLLED RESISTANCE WELDING MACHINE AND SCREW AND NUT SYSTEM OR THE LIKE

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9014920A1 *

Also Published As

Publication number Publication date
FI910340A0 (en) 1991-01-23
WO1990014920A1 (en) 1990-12-13

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