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
  • B23K1/00—Soldering, e.g. brazing, or unsoldering
  • B23K1/005—Soldering by means of radiant energy
  • B23K1/0056—Soldering by means of radiant energy soldering by means of beams, e.g. lasers, E.B.
• • 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
  • B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
  • B23K33/004—Filling of continuous seams
  • B23K33/006—Filling of continuous seams for cylindrical workpieces
• • 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
  • B23K2101/04—Tubular or hollow articles

Definitions

• the present invention relates to a method of manufacturing a metal package and more specifically to the assembly of such a package.
• the present invention can be applied to the manufacture of beverage cans, cans or any other metallic packaging.
• a package comprises at least two metal parts assembled, generally by crimping.
• the two minimum pieces constituting a package are a container box and a lid closing said box.
• More complex packaging can nevertheless be envisaged in the context of the present invention, comprising three or more assembled parts.
• Figure 1 illustrates a conventional packaging manufacturing process.
• a metal cover 11 is crimped onto a metal box 10.
• Crimping 5 consists of rolling two sheets of metal together with a seal 6.
• An alternative technique to crimping can be welding.
• the weld is not perfectly suited to the assembly of packaging since the production of a weld consists in melting the metal constituting the packaging.
• Such a fusion involves a sharp rise in temperature at the welding point and leads to the deterioration of the surface treatments of the packaging, such as the interior anticorrosion treatments and the exterior decoration treatments for example.
• the assembly of metal parts by crimping is a simple technique but which reaches its limits of reliability when the metal sheets become very thin.
• industrial constraints encourage the use of less and less raw material, that is to say less and less of metal, and therefore the use of metal parts having an increasingly fine thickness.
• This constraint on the thickness of the walls of the packaging weighs in particular on the beverage can industry.
• the crimping uses a significant amount of metal to perform the winding.
• the crimping technique is not always very suitable when it is desired to produce more complex packaging, for example comprising several compartments in the same box or a box provided with a double bottom.
• US Pat. No. 5,088,870 proposes a method for producing a metallic packaging comprising double compartments.
• the method proposed in this patent is complex to implement and limited to certain geometries and dimensions of the packaging.
• the objective of the present invention is to propose another technique for assembling metal parts, particularly well suited to assembling packages comprising several compartments with very thin metal walls.
• the present invention proposes to carry out the assembly of the metal parts by brazing, that is to say by fusion and solidification of a metal thus ensuring a connection between the parts to be assembled.
• the invention relates to a packaging manufacturing method comprising a step of assembling at least two metal parts, characterized in that the assembly of said parts is carried out by brazing.
• the brazing is carried out by localized heating of a brazing metal covering a brazing zone on one of the parts to be assembled.
• the localized heating of the brazing metal is generated by a laser beam focused on the brazing zone or by induction around the brazing zone.
• the metal parts to be assembled are made of steel and the brazing metal comprises tin.
• the parts to be assembled are composed of a box and a cover and / or a box and a separation of box body and / or two nested boxes.
• FIG. 3 illustrates a second embodiment of the invention
• FIG. 4 illustrates a third embodiment of the invention.
• the invention applies to the assembly of metal parts constituting a package, as illustrated in FIG. 2.
• a metal box 10, preferably made of steel, must be assembled with a metal cover 11 which can be made of the same material or other metallic material. According to the invention, this assembly is carried out by brazing.
• Brazing requires the presence of a brazing material composed of a metal whose melting point is lower than that of the metal constituting the packaging.
• a brazing metal comprising tin is suitable.
• the brazing metal 15 is deposited on at least one of the parts to be assembled, 10 or 11, in the form of a thin layer. The deposition of the brazing metal 15 defines a so-called brazing zone.
• the brazing is obtained by heating the brazing zone of the pre-assembled parts.
• the heating causes the brazing metal 15 to melt.
• the brazing metal 15 solidifies and thus solidifies the parts 10 and 11.
• Brazing simply requires heating to allow the brazing metal to melt. But to guarantee reliable soldering and responding to constraints of high industrial rates, it is preferable that the heating of the soldering zone is rapid, intense and localized on said zone. Such heating can be obtained, for example, by a laser beam focused on the soldering zone or by induction around said zone.
• the heating of the induction brazing area is particularly suitable for the geometry of cylindrical metal cans, such as cans for example.
• Localized induction heating involves heating the brazing metal 15 by the Joule effect. Eddy currents are induced by an alternating magnetic field generated by at least one induction coil 16 surrounding the brazing zone and supplied by a high frequency alternating current. The high production rates can thus be supported for the assembly of packages according to the invention, since heating and especially cooling are rapid in the case of localized heating.
• this assembly technique is easy to implement because it does not require any direct contact with the packaging.
• a brazing layer of about 0.02 mm can be deposited on the wall of at least one of the parts to be assembled.
• a heating power of 10 kW for 50 to 100ms allows the brazing of the parts to be assembled.
• FIG. 3 illustrates the production of a separation 14 in a metal box body 10 to create compartments, the solder according to the invention being produced by means of a laser beam 18 focused on the brazing metal 15.
• the invention allows the manufacture of complex packaging boxes combining the different embodiments illustrated.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Physics & Mathematics (AREA)
• Optics & Photonics (AREA)
• Packages (AREA)
• Rigid Containers With Two Or More Constituent Elements (AREA)
• Laminated Bodies (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=27676154

Family Applications (1)

Country Status (10)

Family Cites Families (16)

• 2002
  • 2002-02-28 FR FR0202522A patent/FR2836407B1/fr not_active Expired - Fee Related
• 2003
  • 2003-02-20 AU AU2003222582A patent/AU2003222582A1/en not_active Abandoned
  • 2003-02-20 WO PCT/FR2003/000560 patent/WO2003072289A2/fr not_active Ceased
  • 2003-02-20 RU RU2004128944/02A patent/RU2004128944A/ru not_active Application Discontinuation
  • 2003-02-20 JP JP2003571023A patent/JP2005518996A/ja not_active Withdrawn
  • 2003-02-20 CN CNA038048949A patent/CN1638906A/zh active Pending
  • 2003-02-20 US US10/505,869 patent/US20050150934A1/en not_active Abandoned
  • 2003-02-20 EP EP03717415A patent/EP1483076A2/de not_active Withdrawn
  • 2003-02-20 CA CA002476847A patent/CA2476847A1/fr not_active Abandoned
• 2004
  • 2004-08-17 ZA ZA200406551A patent/ZA200406551B/en unknown

Non-Patent Citations (1)

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