EP1838488A1 - Procede pour assembler au moins une premiere tole et une deuxieme tole par soudage laser, procede pour assembler au moins trois toles par soudage laser, application des procedes et element realise selon ces procedes - Google Patents

Procede pour assembler au moins une premiere tole et une deuxieme tole par soudage laser, procede pour assembler au moins trois toles par soudage laser, application des procedes et element realise selon ces procedes

Info

Publication number
EP1838488A1
EP1838488A1 EP06704617A EP06704617A EP1838488A1 EP 1838488 A1 EP1838488 A1 EP 1838488A1 EP 06704617 A EP06704617 A EP 06704617A EP 06704617 A EP06704617 A EP 06704617A EP 1838488 A1 EP1838488 A1 EP 1838488A1
Authority
EP
European Patent Office
Prior art keywords
sheets
laser
sheet
welding
joining
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Withdrawn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
EP06704617A
Other languages
German (de)
English (en)
Inventor
Axel Geisler
Matthew Cooper
Andreas Schmitter
Michael Hamers
Vincenzo Oliva
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.)
Johnson Controls GmbH
Original Assignee
Johnson Controls GmbH
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 Johnson Controls GmbH filed Critical Johnson Controls GmbH
Publication of EP1838488A1 publication Critical patent/EP1838488A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/68—Seat frames
    • B60N2/682—Joining means
    • 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
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/20—Bonding
    • B23K26/21—Bonding by welding
    • B23K26/24—Seam welding
    • B23K26/244—Overlap seam welding

Definitions

  • Method for joining at least a first sheet and a second sheet by means of laser welding Method for assembling at least three sheets by means of laser welding, use of the method and component, produced by means of the method
  • the present invention relates to a method for joining at least a first sheet and a second sheet by means of laser welding, which are at least partially stacked on each other so that they form an overlap region. Furthermore, the present invention relates to a method for assembling at least three sheets by means of laser welding. Furthermore, the present invention relates to the use of the method and a manufactured by one of the method component.
  • the fuel consumption of vehicles increases with the weight to be transported. It is well known that in the automotive industry, especially in the automotive industry, the weight of vehicles increases due to the increasing cost of components to provide the ever increasing comfort of the vehicles. A main task of the manufacture of the vehicle industry is therefore the weight optimization of the components of the vehicle.
  • the object of the invention is therefore the weight optimization of the components, in particular of a vehicle and in particular of a motor vehicle, wherein the components should have a very high rigidity and strength at the same time and the components are to be manufactured at the same cost, in particular by optimizing the assembly times and special by optimizing Insertion and welding times of the components.
  • the object is achieved with a method for joining at least a first sheet and a second sheet by means of laser welding, which are at least partially stacked on each other so that they form an overlap region, wherein the sheets are welded together after stacking in the overlapping area along a pendulum line.
  • the pendulum line is the line that the laser beam of the laser makes on the laser-facing sheet metal.
  • the resulting weld seam becomes longer in comparison to welding along a straight line, the straight line of the projection of the pendulum line corresponding to an axis which intersects the pendulum line at least in two points. Since the welding seam formed along the pendulum line during welding of the sheets is longer than the weld seam which is produced along a straight line during welding, the strength of the weld seam is greater.
  • a manufactured by the method according to the invention component therefore has greater strength and rigidity due to the greater strength of its welds and is therefore both more durable and more resilient.
  • the thickness of the sheets can be reduced, so that although the rigidity and strength of the manufactured component is not or not substantially larger, but the weight of the component is reduced.
  • the method according to the invention therefore makes it possible to optimize the components in terms of their strength and stiffness on the one hand and their weight on the other hand.
  • the pendulum line is provided substantially wave-shaped.
  • Other essentially arbitrary curves of the pendulum line are possible, for example, a curved, a jagged or a round course of the pendulum line.
  • a jagged course of the pendulum line possibly stress peaks in the weld, which can lead to the cracking of the weld seam, while the voltage curve is more homogeneous with wavy or curved pendulum line.
  • a round course requires a retraction of the laser and / or the sheets.
  • a jagged or round course of the pendulum line is therefore not optimal with respect to the speed of producing the weld and / or with respect to the transport of the sheet (s).
  • the laser and / or the sheets can be moved uniformly, so that the speed of assembly, in particular with respect to the welding times, is optimized.
  • the width of a region of the components intended for welding can be selected to be smaller than when welding by means of a welding process that requires touching the metal sheets to be welded, in particular in the case of complex shape of the metal sheets or of the metal to be produced component. The required size of the sheet or the sheets is therefore smaller, so that the weight of the component to be manufactured is reduced.
  • the strength of the weld and the rigidity of the component increases with increasing amplitude or reduction of the wavelength of the wave-shaped pendulum seam due to the lengthening of the length of the weld compared to the rectilinear weld, so that the strength of the weld and the rigidity of the component by variation of amplitude and wavelength of the pendulum line is adjustable.
  • the sheets have an overlapping region during welding - and thus not welded together by means of a butt welding process, at to which they must be placed very close together - and due to the welding along the pendulum line - which allows a greater tolerance when inserting the sheets - no greater insertion accuracy of the sheets is required in the inventive method than in the conventional resistance spot welding.
  • a laser is provided above the overlapping area of the sheets.
  • the sheets are completely melted in the region of the weld over its entire thickness, so that they connect to each other during solidification substantially optimal.
  • the pendulum line is at an angle to the main load direction, more preferably substantially transverse to the main load direction, most preferably at an angle of about 45 °.
  • the main loading direction is the direction in which the weld is substantially stressed when using the finished component.
  • the length of the pendulum line is 10 - 25 mm, more preferably 15 - 20 mm.
  • the skilled person understands that the length of the pendulum line on the required strength of the weld or the required strength and rigidity of the component and on the thickness of the sheets used depends.
  • the first sheet and the second sheet have an uneven thickness, and are layered with decreasing thickness in the direction of the laser.
  • the layers of the sheets with decreasing thickness in the direction of the laser may be advantageous since the thinner sheet has a smaller thickness Having rigidity than the thicker sheet, and therefore the laying of the thinner sheet on the thicker sheet and the subsequent bracing can be done easier and faster. The insertion times of the sheets during assembly are therefore reduced.
  • At least three sheets are joined together by means of laser welding, which are at least partially stacked on each other so that they form an overlap region, wherein either
  • the at least two thickest sheets are layered and welded together with decreasing thickness towards the laser, and then the next thinner or thinner sheets are layered and welded to the welded thicker sheets with thickness decreasing in the direction of the laser, or
  • the gradual welding of the sheets with one another in the second and third subpoints is advantageous in terms of the accessibility of the sheets during assembly, in particular because laser welding requires only one-sided accessibility.
  • the stepwise welding of the sheets allows to use a laser with a lower energy input than simultaneously welding all the sheets together while still maintaining the strength of the weld by using a laser that substantially completely seals the thickest sheets during welding be melted along its thickness. Since the thicker sheets are already substantially optimally welded together, when welding thinner sheets only has to be ensured that the weld of the thinner sheets with at least the next thicker (adjacent) sheet is substantially optimal. In contrast, with simultaneous welding of all sheets together, the assembly is possible faster.
  • a stamping is provided at least on a metal sheet in the overlapping area.
  • embossing ripples of one or the sheets to be welded together are compensated and the sheets are in the region of the embossment substantially to each other.
  • the distance between the sheets is therefore substantially minimal in the region of the weld.
  • the embossment is provided on the thicker sheet, since the thinner sheet can more easily adapt to the contour of the thicker sheet.
  • Another object of the present invention is the use of the method according to the invention for producing a component for a vehicle, in particular for a motor vehicle and in particular for the frame of a motor vehicle seat.
  • the components can be made optimized due to the welding according to the invention along the pendulum line and therefore the high strength of the weld in terms of their weight and their rigidity and strength.
  • the process does not require greater insertion accuracy of the sheets during assembly, as for example in the conventional
  • the strength of the weld is particularly in consideration of the main load direction and arranging the pendulum line in an angle of about 45 ° to the main load direction particularly large.
  • Laying the sheets with decreasing thickness in the direction of the laser may be advantageous in terms of the accessibility of the sheets during assembly.
  • the simultaneous welding of all sheets together is very fast. With regard to the insertion and tensioning of the sheets during assembly, this stratification may be easier and faster and therefore less expensive.
  • Another object of the present invention is a component, wherein the component is manufactured by the method according to the invention.
  • the component is a frame of a motor vehicle seat.
  • the component can be any component whose force which can be transmitted by means of the weld seam is large and / or which can be mounted easily and quickly.
  • the inventive method is applicable to both metallic sheets and thermoplastic sheets.
  • FIG. 1 shows a component manufactured by means of the method according to the invention.
  • FIG. 2 shows another component produced by the method according to the invention.
  • FIG. 3 shows the layers and simultaneous welding of metal sheets with sheet metal thickness decreasing in the direction of the laser.
  • FIG. 4 shows the layering and stepwise welding of metal sheets with sheet metal thickness decreasing in the direction of the laser.
  • FIG. 5 shows an embossment of a sheet and the arrangement of the weld seam.
  • FIG. 6 shows by way of example the arrangement of a first metal sheet with a flange on a second metal sheet.
  • FIG. 7 schematically shows a comparison of the load capacity of a plurality of weld seams produced by the method according to the invention with a weld seam produced by means of a conventional resistance spot welding method.
  • FIG. 8 shows a cross-section of a component produced by means of the method according to the invention.
  • Figure 9 shows a frame of a backrest of a motor vehicle seat, which was produced by the method according to the invention.
  • FIG. 1 shows a component according to the invention manufactured by means of the method according to the invention.
  • Representation a shows a side view while representation b shows a front view.
  • the component consists of a first sheet 1 and a second sheet 2.
  • the sheets 1, 2 are at least partially stacked on each other so that they form an overlap region 5.
  • Representation a shows the arrangement of the laser 6 above the overlapping region 5 of the sheets 1, 2 and the laser beam 1 1 emanating from the laser 6 when welding the sheets 1, 2 from the laser 6 and onto the sheet 6 facing the laser 6.
  • Representation b shows the pendulum line 4 along which the sheets 1, 2 are welded together.
  • the length of the pendulum line 4, which is indicated schematically by the arrow 9, is longer than the length of a straight line indicated by the arrow 9 ', which corresponds to the projection of the pendulum line 4 on an axis extending through at least two points of the pendulum line 4 axis ,
  • the main load direction of the welding seam 4 ' which is produced with one another along the pendulum line 4 during welding of the sheets 1, 2, is indicated, see FIG. 5.
  • the main load direction 8 is arranged at an angle 7 to the pendulum line 4, which is approximately 90 °.
  • FIG. 2 shows another component according to the invention manufactured by means of the method according to the invention.
  • the illustration also shows the first sheet 1 and the second sheet 2, but the pendulum line 4 is arranged at an angle 7 of about 45 ° to the main load direction 8. By means of the arrow 8 ', the direction opposite to the main load direction 8 is indicated.
  • the illustration also shows schematically the length of the pendulum line 9 and the length of the straight line 9 '.
  • FIG. 3 shows the layers and simultaneous welding of-in this case three-sheets 1, 2, 3 with a decreasing sheet thickness 10, 10 ', 10 "in the direction of the laser 6, see Figure 1.
  • the sheets form an overlap region 5.
  • the sheets 1, 2, 3 are simultaneously welded together.
  • FIG 4 shows the layering and stepwise welding of-in this case three-sheets 1, 2, 3 with sheet metal thickness 10, 10 ', 10 "decreasing in the direction of the laser 6.
  • the laser 6 is likewise indicated here by means of the laser beam 11 and with respect to FIG Sheet thickness 10, 10 ', 10 "see Figure 3.
  • Figure A shows the Verschwei Shen the two thicker sheets 1, 2 in their overlap area 5.
  • Figure b shows the subsequent welding of the thinnest sheet 3 with the two already welded thicker sheets 1, 2nd in its overlapping area 5 '.
  • FIG. 5 shows an embossment 12 of a metal sheet 1 and the arrangement of the weld seam 4 'between the metal sheet 1 and a second metal sheet 2 resting substantially on the embossment 12.
  • the distance 13 between the first and the second metal sheet is in the region outside the embossment 12 essentially determined by the thickness of the embossment 12 and is preferably about 1/10 - 8 / 10mm, more preferably about 5 / 10mm.
  • the weld 4 ' is preferably provided within the embossment 12.
  • FIG. 6 shows by way of example the arrangement of a first metal sheet 1 with a flange 14 on a second metal sheet 2.
  • the arrow 15 indicates the width 15 of the flange 14 required for the welding of the metal sheets 1, 2 by means of the method according to the invention. It is preferably 6 - 10mm, more preferably about 8mm.
  • the Embossment 12 is provided in the area indicated by the arrow width 15 of the flange 14 on preferably one of the two sheets 1, 2.
  • FIG. 7 schematically shows a comparison of the load capacity of a plurality of weld seams 4 'produced by the method according to the invention, see FIG. 5, with a weld seam produced by means of a conventional resistance spot welding method.
  • Representation a shows the force which can be transmitted by the weld seam during production of the weld by means of the resistance spot welding method, the transferable force being shown schematically on the scale in the vertical direction and being indicated by the arrow 16.
  • FIG. 8 shows a cross-section of a component according to the invention produced by the method according to the invention.
  • the component is made of several different thickness sheets 1, 2, 3.
  • first the first sheet 1 and the second sheet 2 are welded together at a first weld 41, wherein the sheets 1, 2 in the direction of the laser 6, which here indicated by the laser beam 1 1 is to be arranged decreasing thickness.
  • the arrangement or clamping of the sheets 1, 2 is indicated by means of a tool holder 16.
  • the third sheet 3 is welded together with the first sheet 1 and the second sheet 2 at a second weld 42, wherein the third sheet 3 is thinner than the first and the second sheet 1, 2.
  • Figure 9 shows a frame of a backrest of a motor vehicle seat, which was produced by the method according to the invention.
  • pivot bearing reinforcements 17 pivot bracket
  • the reinforcing frame 19 Reinforcement- frame
  • the back plate 18 back panel
  • the weld seam areas are provided with a stamp 12, not here is visible, so that the distance between the sheets 17, 18, 19 in the region of the weld is as small as possible.
  • the embossment 12 is preferably provided in each case in the thicker metal sheets, ie in this case during welding of the pivot bearing reinforcements 17 to the reinforcing frame 19 on the pivot bearing reinforcements 17 and during welding of the back plate 18 to the reinforcing frame 19 on the reinforcing frame 19.
  • the back plate 17, since it is very thin, can adapt very well to the contour of the reinforcing frame 19.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mechanical Engineering (AREA)
  • Plasma & Fusion (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Transportation (AREA)
  • Laser Beam Processing (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Seats For Vehicles (AREA)

Abstract

L'invention concerne un procédé pour assembler au moins une première tôle (1) et une deuxième tôle (2) par soudage laser, ces tôles étant au moins en partie superposées et formant ainsi une zone de recouvrement (5). Selon l'invention, après avoir été superposées, les tôles sont soudées l'une à l'autre le long d'une ligne de suspension (4) dans la zone de recouvrement (5).
EP06704617A 2005-01-12 2006-01-10 Procede pour assembler au moins une premiere tole et une deuxieme tole par soudage laser, procede pour assembler au moins trois toles par soudage laser, application des procedes et element realise selon ces procedes Withdrawn EP1838488A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005001606A DE102005001606B4 (de) 2005-01-12 2005-01-12 Verfahren zum Zusammmenfügen zumindest eines ersten Bleches und eines zweiten Bleches mittels Laserschweißen
PCT/EP2006/050129 WO2006074999A1 (fr) 2005-01-12 2006-01-10 Procede pour assembler au moins une premiere tole et une deuxieme tole par soudage laser, procede pour assembler au moins trois toles par soudage laser, application des procedes et element realise selon ces procedes

Publications (1)

Publication Number Publication Date
EP1838488A1 true EP1838488A1 (fr) 2007-10-03

Family

ID=36128431

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06704617A Withdrawn EP1838488A1 (fr) 2005-01-12 2006-01-10 Procede pour assembler au moins une premiere tole et une deuxieme tole par soudage laser, procede pour assembler au moins trois toles par soudage laser, application des procedes et element realise selon ces procedes

Country Status (5)

Country Link
US (1) US20100147809A1 (fr)
EP (1) EP1838488A1 (fr)
JP (1) JP2008526520A (fr)
DE (1) DE102005001606B4 (fr)
WO (1) WO2006074999A1 (fr)

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US8282168B2 (en) 2006-10-27 2012-10-09 Johnson Controls Technology Company Component, in particular for a vehicle seat

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Also Published As

Publication number Publication date
DE102005001606A1 (de) 2006-09-14
US20100147809A1 (en) 2010-06-17
DE102005001606B4 (de) 2010-01-14
WO2006074999A1 (fr) 2006-07-20
JP2008526520A (ja) 2008-07-24

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