EP1704015A1 - Welding device - Google Patents

Welding device

Info

Publication number
EP1704015A1
EP1704015A1 EP04804111A EP04804111A EP1704015A1 EP 1704015 A1 EP1704015 A1 EP 1704015A1 EP 04804111 A EP04804111 A EP 04804111A EP 04804111 A EP04804111 A EP 04804111A EP 1704015 A1 EP1704015 A1 EP 1704015A1
Authority
EP
European Patent Office
Prior art keywords
welding device
servo motor
electrode carriers
linear guide
electrode
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Withdrawn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
EP04804111A
Other languages
German (de)
French (fr)
Inventor
Gerhard Lechler
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.)
Promess Gesellschaft fur Montage- und Pruefsysteme Mbh
Original Assignee
Promess Gesellschaft fur Montage- und Pruefsysteme Mbh
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Promess Gesellschaft fur Montage- und Pruefsysteme Mbh filed Critical Promess Gesellschaft fur Montage- und Pruefsysteme Mbh
Publication of EP1704015A1 publication Critical patent/EP1704015A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/30—Features relating to electrodes
    • B23K11/31—Electrode holders and actuating devices therefor
    • B23K11/314—Spot welding guns, e.g. mounted on robots
    • B23K11/315—Spot welding guns, e.g. mounted on robots with one electrode moving on a linear path

Definitions

  • the invention relates to a welding device with two electrode carriers that can be moved relative to one another by a servo motor and can be equipped with electrodes.
  • Welding devices of the above type are known, in which - as in the case of DE 101 44 731 A1 - either from both electrode carriers or - as in the case of DE " 33 27 510 C2 - at least one electrode carrier performs a scissor-shaped movement.
  • a disadvantage of the known constructions is also the fact that whenever the distance between the electrodes transferred to the welding position and the weld metal is different before the electrodes are pressed on, deformations of the weld metal cannot be ruled out, since the electrode closer to the weld metal does this The weld metal is displaced against the electrode further away from the weld metal. The distances traveled here are small in practice, but they are by no means insignificant for the perfect welding process. Presentation of the invention
  • the invention has for its object to provide a welding device of the type under consideration, in which both electrodes perform a linear movement and in the positioning errors when transferring the electrodes into the welding position are compensated for without disturbing displacements or deformations of the weld metal.
  • This object is achieved according to the invention in a welding device of the type under consideration in that it has at least one linear guide on which both electrode carriers are guided, that the electrode carriers and the servo motor form an assembly floating on the linear guide and that the assembly is carried out Means for balancing their weight is held in a basic position from which the electrode carriers can be transferred into the welding position.
  • the welding device has the advantage that, due to the linear movement of the electrode carriers, a full-area and full contact between the electrodes and the weld metal is ensured, regardless of the position and thickness of the parts to be welded.
  • the floating mounting of the parts used to carry out the welding process makes it possible to automatically transfer the electrodes into a symmetrical position with respect to the weld metal.
  • the weight compensation means preferably formed by at least one spring, hold the electrode carriers and the servomotor in a central position.
  • the device is equipped with a brake, by means of which the assembly formed by the electrode carriers and the servo motor can be locked on the linear guide during certain process phases.
  • Fig. 1 shows the essential parts of the device transferred to a welding point in its starting position
  • FIG. 2 shows the position of the parts of the welding device according to FIG. 1 in a first intermediate position
  • Fig. 3 shows the position of the parts of the welding device in a second intermediate position
  • Fig. 4 shows the position of the parts of the welding device in the welding position
  • Fig. 5 shows the position of the parts of the welding device during the return to the starting position.
  • Fig. 1 is a linear guide on which three carriages 2, 3 and 4 are floating.
  • an upper electrode carrier 6 Connected to the carriage 2 by screws 5 is an upper electrode carrier 6, which carries an electrode 7 at one end and, at its other end, encloses the spindle 8 of a screw drive driven by a servo motor 9 with a nut (not shown).
  • 10 is a coupling that connects the upper stub shaft 11 of the shaft of the servo motor 9 to the spindle 8.
  • a lower electrode carrier 12 is connected to the carriage 4 by means of screws 5, which carries an electrode 13 at one end and, at its other end, encloses a further spindle 14 of the screw drive with a nut (not shown), the spindle 14 via a coupling 15 is connected to the stub shaft 16 of the shaft of the servo motor 9.
  • the spindles 8 and 14 have opposite threads.
  • the servo motor 9 is connected to the carriage 3 by means of a cross member 17.
  • a brake is attached to the end of the cross member 17 facing away from the servo motor 9.
  • Rail 18 attached, the position of which can be locked in any position by the brake piston 19 of an electrically or pneumatically actuable brake 20.
  • the carriages 2, 3, 4 with the electrode carriers 6 and 12 and the cross member 17 together with the servo motor 9 and the spindles 8, 14 form an assembly which is floatingly supported on the linear guide 1, with a spring 21 having a characteristic curve that is as linear as possible ensures a weight balance.
  • a spring 21 having a characteristic curve that is as linear as possible ensures a weight balance.
  • pneumatic weight compensation can also be used.
  • End stops 22 and 23 are arranged at the upper and lower ends of the linear guide and, together with the clutches 10 and 15 designed as slip clutches, prevent the spindles 8 and 14 from being unscrewed from the nuts of the screw drives arranged in the electrode carriers 6, 12. Both the end stops 22, 23 and the linear guide 1 are attached to a base plate 24, via which the welding device z. B. can be connected to an industrial robot.
  • the linear guide 1 could be replaced by two parallel guides arranged at a distance from one another, between which the servo motor 9 and the spindles 8, 14 can lie. It would also be possible to arrange the screw drive between the ends of the electrode carriers 6, 12 holding the electrodes 7, 13, to mention only a few conceivable variants. In any case, it is ensured that no bending moments are introduced into the spindles of the screw drive and that the end faces 25, 26 of the electrodes 7 and 13 are aligned parallel to one another and to the weld metal.
  • the welding device When the brake 20 is applied, the welding device is transferred into the area of two sheets 27, 28 to be welded to one another, ie into the position shown in FIG. 1. As soon as it has reached the position shown in FIG. As soon as one of the electrodes 7, 8 is located in the immediate vicinity of the laminated core 27, 28, the brake 20 is released with the aid of a program control not described in more detail here and, as shown in FIG. 2, the upper electrode 7 is placed on the laminated plate 27. The servo motor 9 continues to run and "pulls" the lower electrode 13 upwards, while the upper electrode 7 is supported on the plate 27, which forms a fixed point, in other words. In other words, the asymmetrical position of the electrodes 7, 13 is automatically compensated for Sheet stack 27, 28.

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

Abstract

The invention relates to a welding device comprising electrode carriers (6, 12) which are actuated by a servomotor (9). The inventive welding device is characterized in that the servomotor (9) and the electrode carriers (6, 12) constitute a unit that is floatingly mounted on a linear guide (1) and that is maintained in a base position by means of equilibration elements (21).

Description

SchweißvorrichtunqSchweißvorrichtunq
Technisches GebietTechnical field
Die Erfindung betrifft eine Schweißvorrichtung mit zwei durch einen Servomotor relativ zueinander bewegbaren, mit Elektroden bestückbaren Elektrodenträgern.The invention relates to a welding device with two electrode carriers that can be moved relative to one another by a servo motor and can be equipped with electrodes.
Stand der TechnikState of the art
Bekannt sind Schweißvorrichtungen der vorstehenden Art, bei denen - wie im Falle der DE 101 44 731 A1 - entweder von beiden Elektrodenträgern oder aber- wie im Falle der DE" 33 27 510 C2 - zumindest von einem Elektrodenträger eine scheren- förmige Bewegung ausgeführt wird.Welding devices of the above type are known, in which - as in the case of DE 101 44 731 A1 - either from both electrode carriers or - as in the case of DE " 33 27 510 C2 - at least one electrode carrier performs a scissor-shaped movement.
Bei beiden auch als Schweißzangen bezeichneten bekannten Vorrichtungen bewegt sich zumindest eine Elektrode auf einer Kreisbahn. Dies bedeutet, dass z. B. beim Schweißen von Blechen unterschiedlicher Stärke keine Gewähr für gleichbleibende Kontaktflächen zwischen den Blechen und den Elektroden gegeben ist. Wird die Schwenkbewegung in die Elektrodenträger- wie im Falle der DE 101 44 731 A1 - zudem durch von einem gemeinsamen Elektromotor angetriebene Spindeln in die den Elektroden abgewandten Enden der Elektrodenträger eingeleitet, so muss mit den Verschleiß der Spindeltriebe fördernden Biegebelastu ngen der Spindeln gerechnet werden. Als nachteilig erweist sich bei den bekannten Konstruktionen zudem der Umstand, dass immer dann, wenn der Abstand der in die Schweißposition überführten Elektroden vom Schweißgut vor dem Anpressen der Elektroden unterschiedlich ist, Verformungen des Schweißgutes nicht ausgeschlossen werden können, da die dem Schweißgut nähergelegene Elektrode das Schweißgut gegen die dem Schweißgut ferner gelegenen Elektrode verlagert. Die hierbei zurückgelegten Wege sind in der Praxis zwar gering, aber für den einwand- freien Schweißprozess durchaus nicht bedeutungslos. Darstellung der ErfindungIn both known devices, also known as welding guns, at least one electrode moves on a circular path. This means that e.g. B. when welding sheets of different thicknesses there is no guarantee of constant contact areas between the sheets and the electrodes. If the swiveling movement into the electrode carrier - as in the case of DE 101 44 731 A1 - is also initiated by spindles driven by a common electric motor into the ends of the electrode carrier facing away from the electrodes, bending loads on the spindles which promote the wear of the spindle drives must be expected. A disadvantage of the known constructions is also the fact that whenever the distance between the electrodes transferred to the welding position and the weld metal is different before the electrodes are pressed on, deformations of the weld metal cannot be ruled out, since the electrode closer to the weld metal does this The weld metal is displaced against the electrode further away from the weld metal. The distances traveled here are small in practice, but they are by no means insignificant for the perfect welding process. Presentation of the invention
Der Erfindung liegt die Aufgabe zugrunde, eine Schweißvorrichtung der in Betracht gezogenen Art zu schaffen, bei der beide Elektroden eine lineare Bewegung ausführen und bei der Positionierungsfehler beim Überführen der Elektroden in die Schweißposition ohne störende Verlagerungen bzw. Verformungen des Schweißgutes ausgeglichen werden. Gelöst wird diese Aufgabe bei einer Schweißvorrichtung der in Betracht gezogenen Art erfindungsgemäß dadurch, dass sie mindestens eine Linearführung aufweist, auf der beide Elektrodenträger geführt sind, dass die Elektrodenträger und der Servomotor eine schwimmend auf der Linearführung ge- lagerte Baugruppe bilden und dass die Baugruppe durch Mittel zum Ausgleich ihres Gewichtes in einer Grundposition gehalten wird, aus der die Elektrodenträger in die Schweißposition überführbar sind.The invention has for its object to provide a welding device of the type under consideration, in which both electrodes perform a linear movement and in the positioning errors when transferring the electrodes into the welding position are compensated for without disturbing displacements or deformations of the weld metal. This object is achieved according to the invention in a welding device of the type under consideration in that it has at least one linear guide on which both electrode carriers are guided, that the electrode carriers and the servo motor form an assembly floating on the linear guide and that the assembly is carried out Means for balancing their weight is held in a basic position from which the electrode carriers can be transferred into the welding position.
Die erfindungsgemäße Schweißvorrichtung bietet den Vorteil, dass aufgrund der Linearbewegung der Elektrodenträger unabhängig von der Lage und Dicke der zu verschweißenden Teile eine vollflächige und satte Anlage zwischen den Elektroden und dem Schweißgut gewährleistet ist. Die schwimmende Lagerung der zur Durchführung des Schweißvorganges dienenden Teile ermöglicht es, die Elektroden automatisch in eine symmetrische Position gegenüber dem Schweißgut zu überführen. Die vorzugsweise von mindestens einer Feder gebildeten Mittel zum Ge- wichtsausgleich halten die Elektrodenträger und den Servomotor in einer Mittellage.The welding device according to the invention has the advantage that, due to the linear movement of the electrode carriers, a full-area and full contact between the electrodes and the weld metal is ensured, regardless of the position and thickness of the parts to be welded. The floating mounting of the parts used to carry out the welding process makes it possible to automatically transfer the electrodes into a symmetrical position with respect to the weld metal. The weight compensation means, preferably formed by at least one spring, hold the electrode carriers and the servomotor in a central position.
Als besonders vorteilhaft erweist es sich, wenn die Vorrichtung mit einer Bremse ausgestattet ist, durch die die von den Elektrodenträgern und dem Servomotor gebildete Baugruppe während bestimmter Prozessphasen auf der Linearführung arretierbar ist.It proves to be particularly advantageous if the device is equipped with a brake, by means of which the assembly formed by the electrode carriers and the servo motor can be locked on the linear guide during certain process phases.
Weitere Merkmale und Einzelheiten der Erfindung ergeben sich aus den Unteransprüchen und der nachstehenden Beschreibung einer in den beigefügten schematischen Zeichnungen dargestellten Ausführungsform der Erfindung. Kurze Beschreibung der ZeichnungenFurther features and details of the invention emerge from the subclaims and the following description of an embodiment of the invention illustrated in the attached schematic drawings. Brief description of the drawings
Es zeigen:Show it:
Fig. 1 die wesentlichen Teile der an eine Schweißstelle überführte Vorrichtung in ihrer AusgangspositionFig. 1 shows the essential parts of the device transferred to a welding point in its starting position
Fig. 2 die Lage der Teile der Schweißvorrichtung gemäß Fig. 1 in einer ersten ZwischenpositionFIG. 2 shows the position of the parts of the welding device according to FIG. 1 in a first intermediate position
Fig. 3 die Lage der Teile der Schweißvorrichtung in einer zweiten ZwischenpositionFig. 3 shows the position of the parts of the welding device in a second intermediate position
Fig. 4 die Lage der Teile der Schweißvorrichtung in der Schweißposition undFig. 4 shows the position of the parts of the welding device in the welding position and
Fig. 5 die Lage der Teile der Schweißvorrichtung während der Rückführung in die Ausgangsposition.Fig. 5 shows the position of the parts of the welding device during the return to the starting position.
Wege zur Ausführung der ErfindungWays of Carrying Out the Invention
In Fig. 1 ist 1 eine Linearführung auf der schwimmend drei Schlitten 2, 3 und 4 gelagert sind. Mit dem Schlitten 2 ist durch Schrauben 5 ein oberer Elektrodenträger 6 verbunden, der an seinem einen Ende eine Elektrode 7 trägt und an seinem anderen Ende mit einer nicht dargestellten Mutter die Spindel 8 eines durch einen Servomotor 9 angetriebenen Gewindetriebs umschließt. 10 ist eine Kupplung, die den oberen Wellenstumpf 11 der Welle des Servomotors 9 mit der Spindel 8 verbindet.In Fig. 1, 1 is a linear guide on which three carriages 2, 3 and 4 are floating. Connected to the carriage 2 by screws 5 is an upper electrode carrier 6, which carries an electrode 7 at one end and, at its other end, encloses the spindle 8 of a screw drive driven by a servo motor 9 with a nut (not shown). 10 is a coupling that connects the upper stub shaft 11 of the shaft of the servo motor 9 to the spindle 8.
Mit dem Schlitten 4 ist mittels Schrauben 5 ein unterer Elektrodenträger 12 verbun- den, der an seinem einen Ende eine Elektrode 13 trägt und an seinem anderen Ende mit einer nicht dargestellten Mutter eine weitere Spindel 14 des Gewindetriebes umschließt, wobei die Spindel 14 über eine Kupplung 15 mit dem Wellenstumpf 16 der Welle des Servomotors 9 verbunden ist. Die Spindeln 8 und 14 haben gegenläufige Gewinde.A lower electrode carrier 12 is connected to the carriage 4 by means of screws 5, which carries an electrode 13 at one end and, at its other end, encloses a further spindle 14 of the screw drive with a nut (not shown), the spindle 14 via a coupling 15 is connected to the stub shaft 16 of the shaft of the servo motor 9. The spindles 8 and 14 have opposite threads.
Der Servomotor 9 ist mittels eines Querträgers 17 mit dem Schlitten 3 verbunden.. Am dem Servomotor 9 abgewandten Ende des Querträgers 17 ist eine Brems- schiene 18 befestigt, deren Position durch den Bremskolben 19 einer elektrisch oder pneumatisch betätigbaren Bremse 20 in jeder Lage arretierbar ist.The servo motor 9 is connected to the carriage 3 by means of a cross member 17. A brake is attached to the end of the cross member 17 facing away from the servo motor 9. Rail 18 attached, the position of which can be locked in any position by the brake piston 19 of an electrically or pneumatically actuable brake 20.
Die Schlitten 2, 3, 4 mit den Elektrodenträgern 6 und 12 sowie dem Querträger 17 bilden zusammen mit dem Servomotor 9 und den Spindeln 8, 14 eine Baugruppe, die schwimmend auf der Linearführung 1 gelagert ist, wobei eine Feder 21 mit einer möglichst linearen Kennlinie für einen Gewichtsausgleich sorgt. Statt des Gewichtsausgleiches durch eine Feder kommt auch ein pneumatischer Gewichtsausgleich in Betracht.The carriages 2, 3, 4 with the electrode carriers 6 and 12 and the cross member 17 together with the servo motor 9 and the spindles 8, 14 form an assembly which is floatingly supported on the linear guide 1, with a spring 21 having a characteristic curve that is as linear as possible ensures a weight balance. Instead of weight compensation by means of a spring, pneumatic weight compensation can also be used.
Am oberen und unteren Ende der Linearführung sind Endanschläge 22 und 23 an- geordnet, die zusammen mit den als Rutschkupplungen ausgebildeten Kupplungen 10 und 15 ein Herausdrehen der Spindeln 8 und 14 aus den in den Elektrodenträgern 6, 12 angeordneten Muttern der Gewindetriebe verhindern. Sowohl die Endanschläge 22, 23 als auch die Linearführung 1 sind an einer Grundplatte 24 befestigt, über die die Schweißvorrichtung z. B. mit einem Industrieroboter verbunden werden kann.End stops 22 and 23 are arranged at the upper and lower ends of the linear guide and, together with the clutches 10 and 15 designed as slip clutches, prevent the spindles 8 and 14 from being unscrewed from the nuts of the screw drives arranged in the electrode carriers 6, 12. Both the end stops 22, 23 and the linear guide 1 are attached to a base plate 24, via which the welding device z. B. can be connected to an industrial robot.
Die beschriebene Anordnung der Bauteile wird als besonders vorteilhaft erachtet, schließt jedoch Modifikationen nicht aus. So könnte die Linearführung 1 beispielsweise durch zwei im Abstand voneinander angeordnete Parallelführungen ersetzt werden, zwischen denen der Servomotor 9 und die Spindeln 8, 14 liegen können. Möglich wäre es zudem, den Gewindetrieb zwischen den die Elektroden 7, 13 haltenden Enden der Elektrodenträger 6, 12 anzuordnen, um nur einige denkbare Varianten zu erwähnen. In jedem Fall ist sichergestellt, dass in die Spindeln des Gewindetriebes keine Biegemomente eingeleitet werden und dass die Stirnflächen 25, 26 der Elektroden 7 und 13 parallel zueinander und zum Schweißgut ausgerichtet sind.The arrangement of the components described is considered to be particularly advantageous, but does not exclude modifications. For example, the linear guide 1 could be replaced by two parallel guides arranged at a distance from one another, between which the servo motor 9 and the spindles 8, 14 can lie. It would also be possible to arrange the screw drive between the ends of the electrode carriers 6, 12 holding the electrodes 7, 13, to mention only a few conceivable variants. In any case, it is ensured that no bending moments are introduced into the spindles of the screw drive and that the end faces 25, 26 of the electrodes 7 and 13 are aligned parallel to one another and to the weld metal.
Zum besseren Verständnis der Dinge erfolgt nunmehr anhand der Figuren 1 bis 5 die Schilderung des Ablaufes eines Schweißvorganges.For a better understanding of the things, the process of a welding process is now described with reference to FIGS. 1 to 5.
Die Schweißvorrichtung wird bei angezogener Bremse 20 in den Bereich zweier miteinander zu verschweißender Bleche 27, 28, d. h. in die in Fig. 1 dargestellte Position überführt. Sobald sie die in Figur 2 dargestellte Lage erreicht hat, d. h. so- bald sich eine der Elektroden 7, 8 in unmittelbarer Nähe des Blechpaketes 27, 28 befindet, wird die Bremse 20 mit Hilfe einer hier nicht näher beschriebenen Programmsteuerung gelöst und wie in Fig. 2 dargestellt setzt die obere Elektrode 7 auf dem Blech 27 auf. Der Servomotor 9 läuft weiter und „zieht" die untere Elektrode 13 nach oben, während sich die obere Elektrode 7 auf dem gewissermaßen einen Festpunkt bildenden Blech 27 abstützt. Es erfolgt mit anderen Worten ein automatischer Ausgleich der asymmetrischen Lage der Elektroden 7, 13 gegenüber dem Blechpaket 27, 28. Dieser Ausgleich verhindert, dass die Bleche 27, 28 verformt oder verlagert werden. Sobald die Schließbewegung der Elektroden 7, 13 beendet und die Position in Fig. 4 erreicht ist, erfolgt der Schweißvorgang, wobei der Anpressdruck der Elektroden 7, 13 und die Schweißdauer durch auf den Servomotor 9 einwirkende, nicht dargestellte Sensoren gesteuert werden. Nach Abschluss des Schweißvorganges wird die Bremse 20 erneut betätigt, so dass sich beide Elektroden 7, 13 gleichmäßig von den Blechen 27, 28 entfernen können, bis sie die in Fig. 5 dargestellte Position erreicht haben. Entspricht die erreichte Position nicht der Mittellage, so wird bei geöffneter Bremse 20 der Servomotor 9 eingeschaltet und die Elektrodenträger 6, 12 entfernen sich voneinander bis z. B. der obere Schlitten 2 mit dem Elektrodenträger 6 am Endanschlag 22 zur Anlage kommt. Von diesem Augenblick an drückt der weiterlaufende Servomotor sich nach unten, wobei der untere Schlitten 2 mit dem Elektrodenträger 6 sich gleichzeitig relativ zum Servomotor 20 ebenfalls nach unten bewegt, bis er gegen den Endanschlag 23 anschlägt. Dieser Zeitpunkt wird durch einen nicht dargestellten Kraftsensor erfasst, der den Servomotor 20 abschaltet. Die Elektrodenträger 6, 12 befinden sich nunmehr in ihrer Soll-Ausgangslage. When the brake 20 is applied, the welding device is transferred into the area of two sheets 27, 28 to be welded to one another, ie into the position shown in FIG. 1. As soon as it has reached the position shown in FIG. As soon as one of the electrodes 7, 8 is located in the immediate vicinity of the laminated core 27, 28, the brake 20 is released with the aid of a program control not described in more detail here and, as shown in FIG. 2, the upper electrode 7 is placed on the laminated plate 27. The servo motor 9 continues to run and "pulls" the lower electrode 13 upwards, while the upper electrode 7 is supported on the plate 27, which forms a fixed point, in other words. In other words, the asymmetrical position of the electrodes 7, 13 is automatically compensated for Sheet stack 27, 28. This compensation prevents the sheets 27, 28 from being deformed or displaced. As soon as the closing movement of the electrodes 7, 13 has ended and the position in FIG. 4 has been reached, the welding process takes place, the contact pressure of the electrodes 7, 13 and the welding time can be controlled by sensors (not shown) acting on the servo motor 9. After the welding process has been completed, the brake 20 is actuated again so that both electrodes 7, 13 can move away from the plates 27, 28 evenly until they 5 has reached the position shown. If the position reached does not correspond to the central position, then when the brake is open, the servo motor 9 is switched on and the electrode carriers 6, 12 move away from each other up to e.g. B. the upper carriage 2 comes to rest with the electrode carrier 6 at the end stop 22. From this moment on, the continuing servo motor presses downwards, the lower slide 2 with the electrode carrier 6 also simultaneously moving downwards relative to the servo motor 20 until it stops against the end stop 23. This point in time is detected by a force sensor, not shown, which switches off the servo motor 20. The electrode carriers 6, 12 are now in their target starting position.

Claims

Ansprüche:Expectations:
1 Schweißvorrichtung mit zwei durch einen Servomotor relativ zueinander bewegbaren, mit Elektroden bestückbaren Elektrodenträgern, dadurch gekennzeichnet, dass sie mindestens eine Linearführung (1 ) aufweist, auf der beide Elekt- rodenträger (6, 12) geführt sind, dass die Elektrodenträger (6, 12) und der Servomotor (9) eine schwimmend auf der Linearführung (1) gelagerte Baugruppe bilden und dass die Baugruppe durch Mittel zum Ausgleich ihres Gewichtes in einer Grundposition gehalten wird, aus der die Elektrodenträger (6, 12) in die Schweißposition überführbar sind.1 welding device with two electrode carriers which can be moved relative to one another by a servo motor and can be fitted with electrodes, characterized in that it has at least one linear guide (1) on which both electrode carriers (6, 12) are guided such that the electrode carriers (6, 12 ) and the servomotor (9) form a subassembly floating on the linear guide (1) and that the subassembly is held in a basic position by means of balancing its weight, from which the electrode carriers (6, 12) can be transferred into the welding position.
2 Schweißvorrichtung nach Anspruch 1 , dadurch gekennzeichnet, dass sie mit einer Bremse (20) ausgestattet ist, durch die die von den Elektrodenträgern (6, 12) und dem Servomotor (9) gebildete Baugruppe auf der Linearführung (1) arrre- tierbar ist.2 Welding device according to claim 1, characterized in that it is equipped with a brake (20) by means of which the assembly formed by the electrode carriers (6, 12) and the servo motor (9) can be locked on the linear guide (1).
3 Schweißvorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass auf der Linearführung (1 ) drei Schlitten (2, 3, 4) gelagert sind.3 welding device according to claim 1 or 2, characterized in that on the linear guide (1) three carriages (2, 3, 4) are mounted.
4 Schweißvorrichtung nach Anspruch 2 und 3, dadurch gekennzeichnet, dass durch die Bremse (20) der mit dem Servomotor (9) verbundene Schlitten (3) arretierbar ist.4 Welding device according to claim 2 and 3, characterized in that the slide (3) connected to the servo motor (9) can be locked by the brake (20).
5 Schweißvorrichtung nach einem der Ansprüche 2 bis 4, dadurch gekenn- zeichnet, dass mit dem den Servomotor (9) tragenden Schlitten (3) eine durch einen Kolben (19) der Bremse (20) arretierbare Bremsschiene (18) verbunden ist.5 Welding device according to one of claims 2 to 4, characterized in that a brake rail (18) which can be locked by a piston (19) of the brake (20) is connected to the slide (3) carrying the servomotor (9).
6 Schweißvorrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass der Servomotor (9) zwischen den Elektrodenträgern (6, 12) angeordnet ist. 7 Schweißvorrichtung nach Anspruch 6, dadurch gekennzeichnet, dass durch den Servomotor (6, 12) zwei mit gegenläufigem Gewinde versehene Spindeln (8, 14) antreibbar sind, die mit den Elektrodenträgern (6, 12) zugeordneten Muttern in Eingriff stehen.6 Welding device according to one of claims 1 to 5, characterized in that the servo motor (9) is arranged between the electrode carriers (6, 12). 7 welding device according to claim 6, characterized in that by the servo motor (6, 12) two counter-rotating spindles (8, 14) can be driven, which are in engagement with the electrode carriers (6, 12) assigned nuts.
8 Schweißvorrichtung nach Anspruch 7, dadurch gekennzeichnet, dass die8 welding device according to claim 7, characterized in that the
Spindein (8, 14) über Kupplungen (10, 15) mit sich gegenüberliegenden Wellenstümpfen (11 , 16) der Welle des Servomotors (9) verbunden sind.Spindles (8, 14) are connected via couplings (10, 15) to opposing stub shafts (11, 16) of the shaft of the servo motor (9).
9 Schweißvorrichtung nach Anspruch 8, dadurch gekennzeichnet, dass die9 welding device according to claim 8, characterized in that the
Kupplungen (10, 15) als Rutschkupplungen ausgebildet sind.Couplings (10, 15) are designed as slip clutches.
10 Schweißvorrichtung nach einem der Ansprüche 7 bis 9, dadurch gekennzeichnet, dass die durch den Servomotor (9) antreibbaren Spindeln (8, 14) mit Muttern an den den Elektroden (7, 13) abgewandten Enden der Elektrodenträger (6, 12) in Eingriff stehen.10. Welding device according to one of claims 7 to 9, characterized in that the spindles (8, 14) which can be driven by the servomotor (9) engage with nuts on the ends of the electrode carriers (6, 12) facing away from the electrodes (7, 13) stand.
11 Schweißvorrichtung nach einem der Ansprüche 1 bis 10, dadurch ge- kennzeichnet, dass die Mittel zum Ausgleich ihres Gewichtes von mindestens einer Feder (21) gebildet werden .11 Welding device according to one of claims 1 to 10, characterized in that the means for balancing its weight are formed by at least one spring (21).
12 Schweißvorrichtung nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, dass die Mittel zum Ausgleich ihres Gewichtes von einem Pneumatikzylinder gebildet werden.12 welding device according to one of claims 1 to 10, characterized in that the means for compensating their weight are formed by a pneumatic cylinder.
13 Schweißvorrichtung nach einem der Ansprüche 1 bis 12, dadurch gekennzeichnet, dass die Linearführung (1) mit Endanschlägen (22, 23) versehen ist. 13 Welding device according to one of claims 1 to 12, characterized in that the linear guide (1) is provided with end stops (22, 23).
EP04804111A 2003-12-18 2004-12-15 Welding device Withdrawn EP1704015A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10360313A DE10360313B4 (en) 2003-12-18 2003-12-18 welder
PCT/EP2004/014513 WO2005058535A1 (en) 2003-12-18 2004-12-15 Welding device

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EP1704015A1 true EP1704015A1 (en) 2006-09-27

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EP04804111A Withdrawn EP1704015A1 (en) 2003-12-18 2004-12-15 Welding device

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US (1) US20070090096A1 (en)
EP (1) EP1704015A1 (en)
DE (1) DE10360313B4 (en)
WO (1) WO2005058535A1 (en)

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US20070090096A1 (en) 2007-04-26
DE10360313A1 (en) 2005-07-21
WO2005058535A1 (en) 2005-06-30
DE10360313A8 (en) 2005-11-03
DE10360313B4 (en) 2006-07-06

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