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
  • B23K11/10—Spot welding; Stitch welding
  • B23K11/11—Spot welding
• • 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
  • B23K11/002—Resistance welding; Severing by resistance heating specially adapted for particular articles or work
• • 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
  • B23K11/36—Auxiliary equipment
• • 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
  • B23K11/10—Spot welding; Stitch welding
  • B23K11/11—Spot welding
  • B23K11/115—Spot welding by means of two electrodes placed opposite one another on both sides of the welded parts
• • 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
  • B23K11/16—Resistance welding; Severing by resistance heating taking account of the properties of the material to be welded
• • 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
• • 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
  • B23K2101/00—Articles made by soldering, welding or cutting
  • B23K2101/006—Vehicles
• • 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
  • B23K2103/00—Materials to be soldered, welded or cut
  • B23K2103/16—Composite materials, e.g. fibre reinforced
• • 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
  • B23K2103/00—Materials to be soldered, welded or cut
  • B23K2103/16—Composite materials, e.g. fibre reinforced
  • B23K2103/166—Multilayered materials
• • 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
  • B23K2103/00—Materials to be soldered, welded or cut
  • B23K2103/16—Composite materials, e.g. fibre reinforced
  • B23K2103/166—Multilayered materials
  • B23K2103/172—Multilayered materials wherein at least one of the layers is non-metallic

Definitions

• the invention relates to a method for joining a
• Composite sheet metal part at least two outer cover plates and
• Component has at least one outer metallic layer, wherein the composite sheet metal part and the further component overlap each other between two electrodes
• the invention relates to a device for joining a
• Composite sheet metal part at least two outer cover plates and at least one arranged between the cover plates
• Composite sheet metal parts are composite materials, which are constructed in particular in the form of a sandwich.
• Composite sheet metal parts usually consist of two outer cover sheets and one
• composite sheet metal parts can have very high local stiffnesses and strengths.
• composite sheet metal parts can have good sound insulating properties provide.
• composite sheet metal parts also allow a lower component weight, without sacrificing the other properties of the component. For this reason, composite sheet metal parts are increasingly being used as so-called lightweight sheets in motor vehicle construction.
• Resistance welding are suitable. Resistance welding, for example, is used to easily and inexpensively join the composite sheet metal parts to normal sheet metal parts. In resistance welding, there is a brief, high heat input into the composite sheet metal part, whereby the at least one between the cover plates
• non-metallic layer can be easily damaged. This is the case in particular with plastic layers, which have a lower temperature resistance and, in addition, a lower thermal conductivity than the outer cover plates.
• the plastic layers may also be electrically insulating or at least have a very low electrical conductivity.
• the present invention is therefore based on the object, the method and the device in each case of the type mentioned above and described in more detail above
• KJ / nb 110616 O April 23, 2012 is brought and in which at least one current path between the two electrodes via an electrically conductive
• the invention has therefore recognized that, in order to protect the composite sheet metal part during the joining at locally particularly stressed areas, a dummy element can be used, which is brought into contact with the composite sheet metal part.
• the dummy element is electrically conductive and preferably thermally stable.
• the dummy element may, for example, be very similar to the cover sheet in terms of these properties.
• the dummy element and the outer cover sheets may be made of the same or a similar material.
• the dummy element has a much higher conductivity and / or considerably higher thermal stability. It may then be sufficient to improve the material quality of the dummy element instead of the outer cover plate.
• In resistance welding at least two electrodes are positioned relative to the workpieces to be welded in such a way that between the electrodes an electrically conductive
• Workpieces are in this case the composite sheet metal part and the other component.
• the electrodes may be designed differently and may be formed, for example, as part of a welding tongs or as roller electrodes.
• the dummy element is in at least one at
• Dummy element can also be closed otherwise.
• the dummy element can be a local
• the use of a dummy element avoids unnecessary material requirements.
• the dummy element is characterized by the fact that, preferably, for the mechanical and other properties of the
• Composite sheet is dispensable.
• the dummy element therefore only needs to be provided where locally elevated temperatures can occur during resistance welding.
• the dummy element is not permanently connected by the resistance welding with the composite sheet metal part, but sooner or later falls off the composite sheet metal part or removed.
• the dummy element can so for example only for the duration of resistance welding, so the joining, with the
• the dummy element can also be quite material-intensive, as a solid plate, made.
• the dummy element to bring into contact with the outer cover plate, which is not in contact with the overlapping with the other component, in particular when the further component and the composite sheet metal part are formed flat.
• the dummy element is preferably provided on the outer cover plate facing away from the further component.
• the further component may be an ordinary sheet metal component. It is also conceivable that the further component is a solid metallic component or even a composite material, such as a composite sheet metal part. In order to ensure the weldability of the composite sheet metal part with the other component, the further component, if it is not constructed continuously metallic, in particular at least one outer metallic layer which can be brought into contact with the composite sheet metal part and welded. In a first embodiment of the method, at least one current path between the two electrodes via the
• Dummy element and the two outer cover plates are closed. In this way it can be achieved that a part of the current flows through the dummy element, which would otherwise flow through an outer cover layer.
• the dummy element is provided between an outer cover layer and the electrode so that the current flows through the dummy element into the outer cover layer or vice versa, the current density in the outer cover plate adjacent to the dummy element can be reduced.
• the dummy element may alternatively or additionally but also a part of the heat generated during welding
• the electrode may be brought into abutment with the dummy element to approximately a current path through the
• the dummy element is then preferably associated with a composite sheet metal part
• Electrode brought into contact.
• a current path between the two electrodes can be closed via the dummy element and the electrically conductive component.
• the current path can be so, for example, under partial or preferably
• Composite sheet metal part leads and so also to a
• a procedurally simple implementation can be achieved if the dummy element is received in an electrically conductive connected to the other component recording.
• the recording is preferably used at the same time
• Positioning of the dummy element during welding is preferably carried out before the actual joining. However, the dummy element can also be taken up or positioned within certain limits only during joining. Alternatively or
• a plurality of dummy elements provided on a carrier tape can be used. This is particularly advantageous when the carrier tape is moved between an electrode and the composite sheet metal part. This is preferably done between two
• join events where the join events are also two
• a joining event for example, the setting of a
• the carrier tape can ultimately in a corresponding
• a holder for the carrier tape is fixed relative to an electrode.
• the positioning is preferably automatic.
• the carrier tape must then be transported only after a joining event a piece to a next dummy element again in the
• a procedural simplification can be achieved if the plurality of dummy elements is separated from the carrier tape before or during the joining.
• Dummy elements can then be disposed of separately or on
• the electrode and / or the inclusion of the dummy elements For simplicity, carried out by the electrode and / or the inclusion of the dummy elements.
• the joining may be performed so that the dummy member adheres to the composite sheet member.
• the dummy element is finally welded during joining. This may be appropriate
• the dummy element after the joining event can be at least partially separated from the composite sheet metal part. This can be realized in a particularly simple manner by exerting a torsional force on the dummy element in order to
• Shear composite sheet metal part The dummy element can also be wholly or partially by suitable means of cutting from
• Composite sheet metal part to be removed If the dummy element is to be partially removed, it may be expedient to provide at least one corresponding predetermined breaking point in the dummy element, which facilitates a separation of remaining and to be removed dummy parts.
• dummy elements exert a favorable effect if they consist of a material of high electrical conductivity and high melting temperature.
• Conductivities and melting temperatures of the dummy element can be achieved so that the dummy element is not joined to the composite sheet metal part.
• the dummy element can then be used repeatedly for a plurality of joining events, without being significantly damaged or having to be separated again from the composite sheet metal part.
• a solid plate can be used as a dummy element whose thickness is the thickness of the composite sheet metal part and / or an outer
• Cover sheet can significantly exceed.
• a cooling of the dummy element may alternatively or additionally provided a cooling of the dummy element. If the dummy element is held in a receptacle, alternatively or additionally, the receptacle can be cooled. As cooling medium are water, oil or other fluid in question. The cooling can be done via appropriate cooling channels.
• Engraving are used.
• the embossments such as in the form of thorns, thereby piercing an outer cover plate.
• Gases from a non-metallic layer can then be removed by at least one corresponding venting channel.
• the described method can be used in resistance spot welding. There is only a selective amount of heat in the
• Inserted composite sheet metal part and it can be particularly simple and inexpensive dummy elements, such as in the form of
• a receptacle for receiving a dummy element before and / or during joining and for contacting the dummy element is provided with the composite sheet metal part and that the receptacle electrically conductive with the further component connected is.
• FIG. 1 shows a first embodiment of
• Fig. 2 shows the device of Fig. 1 in a schematic
• Fig. 4 shows a second embodiment of
• FIGS. 8a-b shows a section of a section of a third embodiment of the device according to the invention
• FIGS. 1 and 2 a device 1 for joining by means of resistance welding, in particular by means of
• the composite sheet metal part 2 includes in the illustrated and so far preferred embodiment, two outer
• the composite sheet metal part 2 and the further component 3 are in the one shown in Figs. 1 and 2, each other
• the thickness of the circular disk-shaped Dummyelernents 11 is tuned to the welding task. The thickness of the
• the uppermost layer for example, be about 1 mm.
• the uppermost layer for example, be about 1 mm.
• Electrode 7 have a higher compared with the lower electrode 8 contact resistance.
• a current bridge 12 is provided, which is the edge of the composite sheet metal part 2 shown on the right.
• Composite sheet metal part 2 slightly engages around and is electrically conductive.
• the current bridge 12 consequently ensures that during the joining a current path is formed between the two electrodes 7, 8 via the dummy element 11, the upper outer cover plate 4, the current bridge 12, the lower outer cover plate 5 and the further component 3.
• the current bridge 12 thus represents an electrically conductive connection between the outer nb 110616WO April 2012 Covering sheet 4.5 is a further current path between the electrodes 7,8 is closed via the dummy element 11, a receptacle 13, a connection 14 between the receptacle 13 and the further component 3 and the further component 3.
• Especially the parallel formation of the two current paths ensures particularly good joining results.
• the receptacle 13 serves to receive the dummy element 11 and the positioning of the dummy element 11 in the desired orientation to the composite sheet metal part 2.
• the receptacle 13 is formed in the manner of a pliers, so that the receptacle 13 for insertion of the dummy element 11 is expanded or opened and can then be narrowed or closed for fixing or at least contacting. This is shown in particular in FIG. 2.
• the receptacle 13 may be stationary connected to the welding gun 9, but this is not required. Further, the receptacle 13 is connected in the illustrated embodiment via a connection 14 in the form of a flexible cable or a tape with the other component 3, in particular, to multiple welds
• welding point is already another kreiusionnförmiges dummy element 11 is provided.
• the dummy elements 11 can be glued to the composite sheet metal part 2.
• the welding zones 15 of the spot welds are lenticular, as so-called
• Component 3 in and on the other side into the outer component 4 facing away from the outer cover plate 4 inside.
• a receiving web 21 is provided, which has a circumferential recess 22.
• this circumferential recess 22 can be any circumferential recess 22.
• Dummy elements 11 are precisely recorded. In addition, a very secure positioning of the dummy elements 11 is possible by the inclusion of 21 in the context of an undercut.
• Dummy elements 11 provided to the individual welds are fixed in succession on a carrier tape 24.
• the carrier tape 24 is rolled up and is clamped in the automatic feeder 23. In the period between the setting of two successive welds, the carrier tape 23 becomes a piece
• Resistance spot welding per se can be done. This essentially takes place as previously described. To that
• the carrier tape 24 corresponding weakenings, such as in the form of perforations on iron.
• the carrier tape 24 is transported through the space between the composite sheet metal part 2 and the upper electrode 7.
• the transport of the carrier tape 24 could also take place outside this gap and the
• Carrier tape 24 are each introduced into the space after the next dummy element 11 has taken the desired position in the automatic feeder 23.
• FIG. 5 A workpiece produced by a modified method comprising a composite sheet metal part 2 and a further component 3 is shown in FIG. 5 in a sectional view.
• the method is modified so that the welding zone 15 extends only from the further component 3 into the outer cover plate 4 of the composite sheet metal part 2 facing away from the further component 3.
• the dummy element 25 is not firmly connected in this case by the joining of the composite sheet metal part 2 with the other sheet metal part 3 with the composite sheet metal part 2.
• the dummy element 25 can therefore be reused to set the next welding point, which is due to the
• the joining process can be supplemented by a step shown in FIG. 6.
• a rotating punch 26 or the like is pressed against the dummy element 11, thus exerting a torsional force on the dummy element 11. If the torsional force or the moment exerted on the dummy element 11 are large enough, the dummy element 11 will become as a whole
• Fig. 7 is a workpiece comprising a
• Dummy elements 27 are used, the so-called
• Predetermined breaking points 28 are designed so that the
• Dummy element 27 is partially destroyed when a
• Torsionskraft is impressed, as has been described in connection with FIG. 6.
• An inner part 29 of the dummy element 27 connected directly to the welding zone thus remains on the composite sheet metal part 2. The on the
• Composite sheet part 2 remaining part 29 of the dummy element 27 is shown on the right and has approximately the size of the expected bite point or the area of the dummy element 27 joined to the composite sheet metal part 2.
• FIGS. 8a and 8b a part of a receptacle 30 of a device for joining by means of resistance welding is shown
• Receipt 30 has a circular opening 31 and a
• Recess 32 in which a correspondingly formed dummy element can be accommodated.
• the receptacle and the opening could also be formed differently than circular and / or not concentric with each other.
• the receptacle 30 further has a holder 33, via which the dummy element is conductively connected to the further component.
• a cooling channel 34 is provided, which in the illustrated and in so far
• preferred receptacle 30 is annular.
• Cooling passage 34 can be traversed by a cooling medium to dissipate the heat generated during resistance welding.
• the cooling channel 34 is formed in the illustrated and so far preferred receptacle 30 so that it during the joining adjacent to the dummy element and adjacent to
• Composite sheet metal part is.
• both the composite sheet metal part and the dummy element heat can be dissipated.
• the dummy element could have cooling channels, which may be ventilated.
• the cooling channels of the dummy element could also be separated or via the recording with a
• Coolant are supplied, so that the cooling channels of the dummy element are flowed through by coolant.
• puncturing embossments 35 are provided in the form of mandrels which can penetrate an outer cover plate of a composite sheet metal part when the receptacle 30 is pressed against the composite sheet metal part.
• the embossings 35 then protrude into the at least one non-metallic layer.
• the embossings 35 are in the illustrated and so far preferred embodiment of an electrically non-conductive material, such as a ceramic,
• Fig. 9 is a device 40 for joining two composite sheet metal parts 2 by means of resistance welding
• a dummy element 11 is brought between each electrode 7,8 of the welding gun 9 and the associated composite sheet metal part 2 and the further component 3 in the form of a composite sheet metal part, by means of a receptacle 21 of the type already described.
• Each receptacle 21 is with the opposite Composite sheet metal part 2 and the other component 3 electrically connected.
• These connections 14 are each provided via a current bridge 41, which in turn electrically conducts the two outer cover plates 4, 5 of the composite sheet metal part 2 on the one hand and of the further component 3 on the other hand
• FIG. 10 shows a device 45 modified relative to the device 40 illustrated in FIG. 9 for joining a composite sheet metal part 2 and a further component 3 designed as a composite sheet metal part by means of resistance welding.
• this device 45 is dispensed with the use of images for receiving dummy elements. It will be too
• Component 3 via two dummy elements 11 and a
• Cover plates 4,5 and all four dummy elements 11 runs.
• the contact surfaces between each dummy element 11 and the corresponding outer cover plate 4, 5 are small enough
• the dummy elements 11 can also be joined with the associated outer cover plates 4, 5. However, a subsequent separation of the dummy elements 11 from the outer cover plates 4, 5 is possible as required.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Resistance Welding (AREA)
• Lining Or Joining Of Plastics Or The Like (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=45998371

Family Applications (1)

Country Status (9)

Families Citing this family (22)

Family Cites Families (13)

• 2011
  • 2011-05-04 DE DE102011100495A patent/DE102011100495B4/de not_active Expired - Fee Related
• 2012
  • 2012-04-23 MX MX2013012824A patent/MX346909B/es active IP Right Grant
  • 2012-04-23 CN CN201280021790.0A patent/CN103534054A/zh active Pending
  • 2012-04-23 EP EP12716014.1A patent/EP2704869A1/de not_active Withdrawn
  • 2012-04-23 CA CA2834744A patent/CA2834744A1/en not_active Abandoned
  • 2012-04-23 KR KR1020137030556A patent/KR101920451B1/ko active IP Right Grant
  • 2012-04-23 US US14/006,195 patent/US20140224774A1/en not_active Abandoned
  • 2012-04-23 JP JP2014508738A patent/JP5810212B2/ja not_active Expired - Fee Related
  • 2012-04-23 WO PCT/EP2012/057359 patent/WO2012150144A1/de active Application Filing

Non-Patent Citations (2)

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