WO1996036455A1 - Device for feeding welding bolts to a welding gun - Google Patents

Device for feeding welding bolts to a welding gun Download PDF

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Publication number
WO1996036455A1
WO1996036455A1 PCT/DE1996/000861 DE9600861W WO9636455A1 WO 1996036455 A1 WO1996036455 A1 WO 1996036455A1 DE 9600861 W DE9600861 W DE 9600861W WO 9636455 A1 WO9636455 A1 WO 9636455A1
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WO
WIPO (PCT)
Prior art keywords
welding
face
studs
feeding
processing station
Prior art date
Application number
PCT/DE1996/000861
Other languages
German (de)
French (fr)
Inventor
Ewald Quell
Original Assignee
Edag Engineering + Design Ag
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 Edag Engineering + Design Ag filed Critical Edag Engineering + Design Ag
Priority to AU59957/96A priority Critical patent/AU5995796A/en
Publication of WO1996036455A1 publication Critical patent/WO1996036455A1/en

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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
    • B23K9/00—Arc welding or cutting
    • B23K9/20—Stud welding
    • B23K9/206—Stud welding with automatic stud supply

Definitions

  • the invention relates to a feed device intended for feeding welding studs to a welding gun, which has a storage container and an output unit for the welding studs and in which the welding studs are to be welded to a component, in particular a motor vehicle body, with an end face, and each of which has one Has threaded shaft with a contact washer delimiting it for a component to be fastened by means of the welding bolt.
  • Motor vehicle bodies contain a large number of welding bolts, with which components are fastened to the body by means of a screw connection.
  • the welding studs are first attached to the body by welding using the welding gun with their end face.
  • the problem here is that such motor vehicle bodies have relatively large tolerances.
  • the body is measured in the area of the weld studs to be welded on from fixed reference points and then the point is determined at which a weld stud is to be welded on. This requires considerable effort if larger dimensional deviations transversely to the plane of the body area, that is, along the axis of the welding stud, are present and have to be compensated for, because this cannot be compensated for by moving the welding gun.
  • the invention is based on the problem of designing a feed device of the type mentioned at the outset in such a way that the costs for the production of sheet metal structures, in particular bodies, with long, precisely fitting welding bolts are as low as possible.
  • the output unit is followed by a processing station for shortening the length of the welding stud on the side of the end face or for reducing the thickness of the contact washer from the side of the threaded shaft.
  • the processing station can be designed in very different ways.
  • the welding studs could be brought to the desired length, for example by upsetting in the cold or warm state.
  • the machining station is designed for machining the welding stud.
  • the machining station can be produced particularly cost-effectively if, according to another development of the invention, the machining station has an end mill for machining the welding stud on the end face.
  • the conical design of the end face of the welding studs which is advantageous for welding on the welding studs, can be produced in one operation by shortening the welding stud if the end mill has an end face designed as an inner cone.
  • FIG. 1 shows a view of a feed device according to the invention
  • FIG. 2 shows a view of a feed device welding stud to be fed.
  • the feed device shown as a whole in FIG. 1 has a storage container 1 in which welding studs 2 with uniform dimensions are kept ready. These welding studs 2 can be fed individually to a processing station 4 via an output unit 3.
  • This machining station 4 contains a milling unit 5 with a face milling cutter 6, with which it is possible to shorten the length of the welding stud 2 'located in the machining station 4 to a desired dimension.
  • the end mill 6 has an end face designed as an inner cone 7.
  • a line 8 leads from the processing station 4 to a welding gun 9, with which the respectively appropriately machined welding bolt 2 is fastened to the welding point by welding.
  • FIG. 2 shows, compared to FIG. 1, on a larger scale a welding stud 2.
  • This has a threaded shaft 10 with thread 11 and underneath it a flange-shaped contact washer 12 integrally formed with a conical end face 14.
  • the welding stud 2 is welded with this end face 14 against a welding face 16. He then holds a component 17 with a contact surface 15 at a distance X from the welding surface 16.
  • This dimension X must be changed if tolerances in the direction of the longitudinal axis of the welding stud 2 are to be compensated.
  • this end face 14 is machined in the processing station 4 by the end mill 6 in the sense of shortening the welding end 13.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)
  • Arc Welding In General (AREA)
  • Resistance Welding (AREA)

Abstract

A device for feeding welding bolts (2) to a welding gun (9) has a magazine (1) and an ejector (3) for the welding bolts (2). A processing station (4) for shortening the length of the welding bolts (2) on the face side (14) or to reduce the thickness of the bearing plate (12) from the threaded shank (10) side is fitted downstream of the ejector (3). It is thus necessary merely to supply welding bolts (2) of a uniform length suitable for worst-case tolerances.

Description

Beschreibung description
Zum ZufuhrenvonSchweißbolzenzueinerSchweißpistolebestimmteIntended for feeding welding studs to a welding gun
ZuführvorrichtungFeeding device
Die Erfindung betrifft eine zum Zuführen von Schweißbol¬ zen zu einer Schweißpistole bestimmte Zuführvorrichtung, welche einen Vorratsbehälter und eine Ausgabeeinheit für die Schweißbolzen hat und bei der die Schweißbolzen mit einer Stirnfläche an einem Bauteil, insbesondere eine Kraftfahrzeugkarosserie, anzuschweißen sind und die je¬ weils einen Gewindeschaft mit einer diesen begrenzenden Anlagescheibe für ein mittels des Schweißbolzens zu be¬ festigenden Bauteils aufweist.The invention relates to a feed device intended for feeding welding studs to a welding gun, which has a storage container and an output unit for the welding studs and in which the welding studs are to be welded to a component, in particular a motor vehicle body, with an end face, and each of which has one Has threaded shaft with a contact washer delimiting it for a component to be fastened by means of the welding bolt.
Kraftfahrzeugkarosserien enthalten eine Vielzahl von Schweißbolzen, mit denen Bauteile an der Karosserie durch eine Schraubverbindung befestigt sind. Die Schweißbolzen werden hierzu zunächst mittels der Schweißpistole mit ih¬ rer Stirnfläche an der Karosserie durch Schweißen befe¬ stigt. Problematisch ist dabei, daß solche Kraftfahr¬ zeugkarosserien relativ grobe Toleranzen aufweisen. Um diese auszugleichen, vermißt man die Karosserie im Be¬ reich der anzuschweißenden Schweißbolzen von festgelegten Bezugspunkten aus und legt dann die Stelle fest, an der jeweils ein Schweißbolzen anzuschweißen ist. Das erfor¬ dert dann erheblichen Aufwand, wenn größere Maßabweichun¬ gen quer zur Ebene des Karosseriebereiches, also längs der Schweißbolzenachse, vorhanden und auszugleichen sind, weil das durch Versetzen der Schweißpistole nicht ausge¬ glichen werden kann. Ein Ausgleich in der Achsrichtung ist zur Zeit mit bestehenden Systemen nicht oder nur mit erheblichem Aufwand möglich. Um Maßabweichungen in Achsrichtung auszugleichen, könnte man aus einer Vielzahl unterschiedlich langer Schweißbol¬ zen den für die ausgemessenen Gegebenheiten von seiner Länge her richtig bemessenen Schweißbolzen aussuchen und diesen dann der Schweißpistole zuführen. Das Bereithalten unterschiedlich langer Schweißbolzen und das Auswählen des jeweils passenden Schweißbolzens würde jedoch einen erheblichen Kostenfaktor bei der Herstellung von Kraft¬ fahrzeugkarosserien darstellen, insbesondere dann, wenn die Zufuhr der Schweißbolzen automatisch erfolgen soll.Motor vehicle bodies contain a large number of welding bolts, with which components are fastened to the body by means of a screw connection. For this purpose, the welding studs are first attached to the body by welding using the welding gun with their end face. The problem here is that such motor vehicle bodies have relatively large tolerances. In order to compensate for this, the body is measured in the area of the weld studs to be welded on from fixed reference points and then the point is determined at which a weld stud is to be welded on. This requires considerable effort if larger dimensional deviations transversely to the plane of the body area, that is, along the axis of the welding stud, are present and have to be compensated for, because this cannot be compensated for by moving the welding gun. Compensation in the axial direction is currently not possible with existing systems or only with considerable effort. In order to compensate for dimensional deviations in the axial direction, one could choose from a variety of welding studs of different lengths, the welding studs correctly dimensioned in terms of their length for the circumstances, and then feed them to the welding gun. However, the provision of welding studs of different lengths and the selection of the appropriate welding stud would represent a considerable cost factor in the manufacture of motor vehicle bodies, in particular if the welding studs are to be supplied automatically.
Vergleichbare Toleranzprobleme bei der Anbringung von Schweißbolzen treten auch bei anderen Blechkonstruktionen auf, an welche Bauteile mittels Schweißbolzen ange¬ schraubt werden müssen.Comparable tolerance problems when attaching welding studs also occur in other sheet metal constructions to which components must be screwed using welding studs.
Der Erfindung liegt das Problem zugrunde, eine Zuführvor¬ richtung der eingangs genannten Art so zu gestalten, daß die Kosten für die Herstellung von Blechkonstruktionen, insbesondere Karosserien, mit paßgenau langen Schweißbol¬ zen möglichst gering sind.The invention is based on the problem of designing a feed device of the type mentioned at the outset in such a way that the costs for the production of sheet metal structures, in particular bodies, with long, precisely fitting welding bolts are as low as possible.
Dieses Problem wird erfindungsgemäß dadurch gelöst, daß der Ausgabeeinheit eine Bearbeitungsstation zum Verkürzen der Länge des Schweißbolzens an der Seite der Stirnfläche oder zum Verringern der Dicke der Anlagescheibe von der Seite des Gewindeschaftes her nachgeschaltet ist.This problem is solved according to the invention in that the output unit is followed by a processing station for shortening the length of the welding stud on the side of the end face or for reducing the thickness of the contact washer from the side of the threaded shaft.
In einer solchen Zuführvorrichtung braucht man nur Schweißbolzen zu bevorraten, welche eine einheitliche, für den ungünstigsten Toleranzfall ausreichende Länge aufweisen. Die für die jeweiligen Anschweißstellen erfor¬ derliche Abmessung wird dann vor dem Stirnen der Schwei߬ bolzen durch Messen ermittelt und in der Bearbeitungs¬ station durch Verkürzen der Länge des Schweißbolzens oder der Dicke der Anlagescheibe erzeugt. Dank der Neuerung können deshalb alle angeschweißten Schweißbolzen eine ge¬ nau richtig bemessene Größe aufweisen, so daß sich bei der Schweißkonstruktion oder der Kraftfahrzeugkarosserie eine Gewichtsersparnis im Vergleich zu Schweißkonstruk¬ tionen ergibt, bei denen eine begrenzte Zahl von Schwei߬ bolzen unterschiedlicher Länge benutzt wurden.In such a feed device, it is only necessary to stock weld bolts which have a uniform length which is sufficient for the worst case tolerance. The dimension required for the respective welding points is then determined by measuring the forehead of the welding studs and produced in the machining station by shortening the length of the welding stud or the thickness of the contact washer. Thanks to the innovation Therefore, all welded-on welding studs can have a precisely sized size, so that there is a weight saving in the welded construction or the motor vehicle body in comparison to welded constructions in which a limited number of welded studs of different lengths were used.
Die Bearbeitungsstation kann sehr unterschiedlich gestal¬ tet sein. In ihr könnten die Schweißbolzen beispielsweise durch Stauchen im kalten oder warmen Zustand auf die ge¬ wünschte Länge gebracht werden. Für Schweißbolzen aus Stahl, welche bei Kraftfahrzeugkarosserien Verwendung finden, ist es besonders vorteilhaft, wenn die Bearbei¬ tungsstation zur spanabhebenden Bearbeitung des Schwei߬ bolzens ausgebildet ist.The processing station can be designed in very different ways. In it, the welding studs could be brought to the desired length, for example by upsetting in the cold or warm state. For steel welding studs, which are used in motor vehicle bodies, it is particularly advantageous if the machining station is designed for machining the welding stud.
Besonders kostengünstig ist die Bearbeitungsstation zu erzeugen, wenn gemäß einer anderen Weiterbildung der Er¬ findung die Bearbeitungsstation einen Stirnfräser zum Be¬ arbeiten des Schweißbolzens an der Stirnfläche aufweist.The machining station can be produced particularly cost-effectively if, according to another development of the invention, the machining station has an end mill for machining the welding stud on the end face.
Die für das Anschweißen der Anschweißbolzen vorteilhafte konische Ausbildung der Stirnfläche der Schweißbolzen läßt sich in einem Arbeitsgang mit dem Verkürzen des Schweißbolzens erzeugen, wenn der Stirnfräser eine als Innenkonus ausgebildete Stirnfläche hat.The conical design of the end face of the welding studs, which is advantageous for welding on the welding studs, can be produced in one operation by shortening the welding stud if the end mill has an end face designed as an inner cone.
Die Erfindung läßt verschiedene Ausführungsformen zu. Zur weiteren Verdeutlichung ihres Grundprinzips ist eine da¬ von schematisch in der Zeichnung dargestellt und wird nachfolgend beschrieben. Diese zeigt inThe invention allows various embodiments. To further clarify its basic principle, one of these is shown schematically in the drawing and is described below. This shows in
Fig.l eine Ansicht einer erfindungsgemäßen Zuführ¬ vorrichtung,1 shows a view of a feed device according to the invention,
Fig.2 eine Ansicht eines mit der Zuführvorrich- tung zuzuführenden Schweißbolzens.2 shows a view of a feed device welding stud to be fed.
Die in Figur 1 als Ganzes dargestellte Zuführvorrichtung hat einen Vorratsbehälter 1, in welchem Schweißbolzen 2 mit einheitlichen Abmessungen bereitgehalten werden. Über eine Ausgabeeinheit 3 können diese Schweißbolzen 2 ein¬ zeln einer Bearbeitungsstation 4 zugeführt werden. Diese Bearbeitungsstation 4 enthält ein Fräsaggregat 5 mit ei¬ nem Stirnfräser 6, mit dem es möglich ist, die Länge des jeweils in der Bearbeitungsstation 4 befindlichen Schweißbolzens 2' auf ein gewünschtes Maß zu verkürzen. Hierzu hat der Stirnfräser 6 eine als Innenkonus 7 ausge¬ bildete Stirnfläche.The feed device shown as a whole in FIG. 1 has a storage container 1 in which welding studs 2 with uniform dimensions are kept ready. These welding studs 2 can be fed individually to a processing station 4 via an output unit 3. This machining station 4 contains a milling unit 5 with a face milling cutter 6, with which it is possible to shorten the length of the welding stud 2 'located in the machining station 4 to a desired dimension. For this purpose, the end mill 6 has an end face designed as an inner cone 7.
Von der Bearbeitungsstation 4 führt eine Leitung 8 zu ei¬ ner Schweißpistole 9, mit der der jeweils passend bear¬ beitete Schweißbolzen 2 an der Anschweißstelle durch Schweißen befestigt wird.A line 8 leads from the processing station 4 to a welding gun 9, with which the respectively appropriately machined welding bolt 2 is fastened to the welding point by welding.
Die Figur 2 zeigt gegenüber der Figur 1 im Maßstab ver¬ größert einen Schweißbolzen 2. Dieser hat einen Gewinde¬ schaft 10 mit Gewinde 11 und darunter eine flanschartig ausgebildete Anlagescheibe 12. An ihr ist auf der dem Ge¬ windeschaft 10 abgewandten Seite ein Schweißende 13 mit einer konischen Stirnfläche 14 angeformt. Der Schweißbol¬ zen 2 wird mit dieser Stirnfläche 14 gegen eine An¬ schweißfläche 16 geschweißt. Er hält dann ein Bauteil 17 mit einer Anlagefläche 15 auf einen Abstand X zur An¬ schweißfläche 16. Dieses Maß X muß verändert werden, wenn Toleranzen in Richtung der Längsachse des Schweißbolzens 2 ausgeglichen werden sollen. Hierzu wird diese Stirnflä¬ che 14 in der Bearbeitungsstation 4 von dem Stirnfräser 6 spanabhebend im Sinne einer Verkürzung des Schweißendes 13 bearbeitet. Alternativ wäre es jedoch auch möglich, in einer Drehmaschine die Dicke der Anlagescheibe 12 von der Seite des Gewindeschaftes 10 her zu verringern, damit ein sich von der Seite des Gewindeschaftes 10 her auf der Anlagescheibe 12 abstützendes Bauteil geringeren Abstand zu dem Karosserieteil hat, auf welchem die Stirnfläche 14 zu schweißen ist. FIG. 2 shows, compared to FIG. 1, on a larger scale a welding stud 2. This has a threaded shaft 10 with thread 11 and underneath it a flange-shaped contact washer 12 integrally formed with a conical end face 14. The welding stud 2 is welded with this end face 14 against a welding face 16. He then holds a component 17 with a contact surface 15 at a distance X from the welding surface 16. This dimension X must be changed if tolerances in the direction of the longitudinal axis of the welding stud 2 are to be compensated. For this purpose, this end face 14 is machined in the processing station 4 by the end mill 6 in the sense of shortening the welding end 13. Alternatively, however, it would also be possible to reduce the thickness of the contact disk 12 from the side of the threaded shaft 10 in a lathe, so that a from the side of the threaded shank 10, the component supporting the contact disc 12 has a smaller distance from the body part on which the end face 14 is to be welded.
BezugszeichenlisteReference list
1 Vorratsbehälter1 storage container
2 Schweißbolzen2 welding studs
3 Ausgabeeinheit3 output unit
4 Bearbeitungsstation4 processing station
5 Fräsaggregat5 milling unit
6 Stirnfräser6 end millers
7 Innenkonus7 inner cone
8 Leitung8 line
9 Schweißpistole9 welding gun
10 Gewindeschaft10 threaded shaft
11 Gewinde11 threads
12 Anlagescheibe12 contact washer
13 Schweißende13 welding end
14 Stirnfläche14 end face
15 Anlagef1äche15 investment space
16 Anschweißfläche16 welding surface
17 Bauteil 17 component

Claims

Patentansprüche claims
1. Zum Zuführen von Schweißbolzen zu einer Schweißpistole bestimmte Zuführvorrichtung, welche einen Vorratsbehälter und eine Ausgabeeinheit für die Schweißbolzen hat und bei der die Schweißbolzen mit einer Stirnfläche an einem Bau¬ teil, insbesondere eine Kraftfahrzeugkarosserie, anzu¬ schweißen sind und die jeweils einen Gewindeschaft mit einer diesen begrenzenden Anlagescheibe für ein mittels des Schweißbolzens zu befestigenden Bauteils aufweist, dadurch gekennzeichnet, daß der Ausgabeeinheit (3) eine Bearbeitungsstation (4) zum Verkürzen der Länge des Schweißbolzens (2) an der Seite der Stirnfläche (14) oder zum Verringern der Dicke der Anlagescheibe (12) von der Seite des Gewindeschaftes (10) her nachgeschaltet ist.1. A feed device intended for feeding welding studs to a welding gun, which has a storage container and an output unit for the welding studs and in which the welding studs are to be welded to a component, in particular a motor vehicle body, with an end face and each having a threaded shaft one of these abutting washer for a component to be fastened by means of the welding bolt, characterized in that the output unit (3) has a processing station (4) for shortening the length of the welding bolt (2) on the side of the end face (14) or for reducing the thickness the contact washer (12) is connected from the side of the threaded shaft (10).
2. Zuführvorrichtung nach Anspruch 1, dadurch gekenn¬ zeichnet, daß die Bearbeitungsstation (4) zur spanabhe¬ benden Bearbeitung des Schweißbolzens (2) ausgebildet ist.2. Feed device according to claim 1, characterized gekenn¬ characterized in that the processing station (4) is designed for machining machining of the welding stud (2).
3. Zuführvorrichtung nach den Ansprüchen 1 oder 2, da¬ durch gekennzeichnet, daß die Bearbeitungsstation (4) einen Stirnfräser (6) zum Bearbeiten des Schweißbolzens (2') an der Stirnfläche (14) aufweist.3. Feed device according to claims 1 or 2, da¬ characterized in that the processing station (4) has an end mill (6) for machining the welding stud (2 ') on the end face (14).
4. Zuführvorrichtung nach zumindest einem der vorangehen¬ den Ansprüche, dadurch gekennzeichnet, daß der Stirnfrä¬ ser (6) eine als Innenkonus (7) ausgebildete Stirnfläche hat. 4. Feeding device according to at least one of the preceding claims, characterized in that the end mill (6) has an end face designed as an inner cone (7).
PCT/DE1996/000861 1995-05-16 1996-05-15 Device for feeding welding bolts to a welding gun WO1996036455A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU59957/96A AU5995796A (en) 1995-05-16 1996-05-15 Device for feeding welding bolts to a welding gun

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE29507827.8 1995-05-16
DE29507827U DE29507827U1 (en) 1995-05-16 1995-05-16 Feeding device intended for feeding welding studs to a welding gun

Publications (1)

Publication Number Publication Date
WO1996036455A1 true WO1996036455A1 (en) 1996-11-21

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DE (1) DE29507827U1 (en)
WO (1) WO1996036455A1 (en)

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