Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D1/00—Processes for applying liquids or other fluent materials
  • B05D1/32—Processes for applying liquids or other fluent materials using means for protecting parts of a surface not to be coated, e.g. using stencils, resists
  • B05D1/322—Removable films used as masks
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
  • B05D3/06—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation
• • 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
  • B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
  • B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
  • B23K26/062—Shaping the laser beam, e.g. by masks or multi-focusing by direct control of the laser beam
  • B23K26/0622—Shaping the laser beam, e.g. by masks or multi-focusing by direct control of the laser beam by shaping pulses
• • 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
  • B23K26/08—Devices involving relative movement between laser beam and workpiece
  • B23K26/083—Devices involving movement of the workpiece in at least one axial direction
  • B23K26/0853—Devices involving movement of the workpiece in at least in two axial directions, e.g. in a plane
• • 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
  • B23K26/36—Removing material
  • B23K26/362—Laser etching
• • 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
  • B23K26/36—Removing material
  • B23K26/40—Removing material taking account of the properties of the material involved
  • B23K26/402—Removing material taking account of the properties of the material involved involving non-metallic material, e.g. isolators
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B08—CLEANING
  • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
  • B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
  • B08B7/0035—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by radiant energy, e.g. UV, laser, light beam or the like
  • B08B7/0042—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by radiant energy, e.g. UV, laser, light beam or the like by laser
• • 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
  • B23K2101/00—Articles made by soldering, welding or cutting
  • B23K2101/34—Coated articles, e.g. plated or painted; Surface treated articles
• • 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
  • B23K2103/30—Organic material
  • B23K2103/42—Plastics
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B44—DECORATIVE ARTS
  • B44C—PRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
  • B44C1/00—Processes, not specifically provided for elsewhere, for producing decorative surface effects
  • B44C1/22—Removing surface-material, e.g. by engraving, by etching
  • B44C1/228—Removing surface-material, e.g. by engraving, by etching by laser radiation
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B44—DECORATIVE ARTS
  • B44C—PRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
  • B44C3/00—Processes, not specifically provided for elsewhere, for producing ornamental structures
  • B44C3/005—Removing selectively parts of at least the upper layer of a multi-layer article

Definitions

• the invention relates to a method of depositing a layer of paint, and more generally of a decorative coating layer by spraying a trim part.
• part of a side room one face is visible from the outside and that requires a special surface treatment to meet the aesthetic requirements.
• decorative parts elements such that a rear tailgate, a front spoiler, a side door, a bonnet, etc.
• These parts are produced by molding appearance of an opaque thermoplastic material and are painted in the color specified by the vehicle manufacturer.
• the play of appearance has one or more areas for protection that must remain as clean as possible and remain free of decorative coating.
• the fastening area should be as clean as possible before glue is applied and should not receive paint.
• areas of the trim part in particular those which are capable of passing light, for example those in transparent or translucent materials, the back of which are arranged elements for lighting, and must be free from any layer of paint that may filter the light rays.
• temporary masking elements are used, otherwise known as marouflage. These masking elements may be in the form of adhesives, whose shape is adapted, and which are deposited manually by an operator. To reduce the costs of this operation and improve the quality of the protection, it is also known to deposit on the area to be protected a fluid material forming, in solidifying, a temporary masking layer.
• This temporary masking layer is a hot melt adhesive ( "hot melt” in English) which can therefore reach easily applied to the liquid state. Once applied the glue solidifies by cooling and adheres sufficiently on the surface of the room without leaving gaps where could penetrate the paint, while maintaining a good resistance to shocks and clashes that may occur during the handling of parts during the painting process.
• the layer is removed Temporary hide masking to clear the surface free of paint.
• the invention aims to provide a solution to the problem above.
• the method for depositing a sprinkler decorative coating on a side piece to the surface of which a first area is defined to make free of decorative coating, and delimited by an edge according a first given contour provides for performing the following steps:
• Step A depositing on said first zone a temporary masking element whose surface is included entirely in said first zone, the portion covered by the temporary masking element defining a second zone delimited by a second contour,
• Step B depositing one or more decorative layers of coating on the entire surface of the trim part, and allowed to cure the decorative coating for a predetermined time
• Step C remove the temporary masking element and,
• Step D Using a pulsed laser, removing the decorative coating layer between the second and the first contour.
• This technology is based on the use of the light beam to create a thermal and mechanical interaction with the decorative coating layer.
• the pulsation corresponds to a laser shot in which a very concentrated energy is produced for a very short time of the order of a few nanoseconds.
• This laser firing has the effect of raising the coating layer at a very high temperature leading to its melting and then its vaporization, eventually leading to the creation of a plasma.
• the formation and relaxation of the plasma produces mechanical shock waves and acoustic waves that propagate in the material, fragment it, and cause the ejection of particles of various sizes.
• the underlying material forming the piece of appearance is not affected by this treatment.
• the method according to the invention may also comprise in isolation, or in combination, the following characteristics:
• Step C is executed after step D.
• step C Upon completion of step C and step D, a layer of translucent varnish on the entire part of appearance.
• the distance between the first contour and the second contour is between 1 mm and 10 mm.
• a laser emitting pulses of light at a frequency between 0.2KHz and 25KHz is used.
• a pulse laser is used whose peak power is between 25W and 1000W and preferably between 50W and 300W.
• a CO2 laser pulse laser is used.
• an NdYAG pulse laser is used.
• a fiber pulse laser is used.
• a light beam formed by the laser is moved on the surface of the appearance part at a scanning speed of between 2m / s and 5m / s.
• a focal diameter of the light beam at the impingement of said beam on the surface of the trim part is between 0.1 mm and 0.5 mm.
• Figure 1 is a schematic view of a part of the appearance outcome of step A.
• Figure 2 is a schematic view of the appearance of part at the end of step B.
• Figure 3a is a schematic view of the trim part at the end of step C and before the execution of step D
• Figure 3b is a schematic view of the part in appearance according to an alternative embodiment of the invention, at the end of step D is performed prior to step C.
• FIG. 4 is a schematic view of the appearance part at the end of steps C and D.
• Exhibit Aspect 1 shown in Figure 1 illustrates a front portion of the vehicle on which it is desired to deposit a decorative element without covering a first area 10 delimited by an edge, represented in dotted lines, and defining a first contour 11 .
• the first area 10 may correspond, for example, an area of the room where appearance is desired to allow light.
• a temporary masking element 2 such as an adhesive film, or a fluid material such that a thermoplastic adhesive forming, by solidifying a layer of temporary masking.
• the portion covered by the temporary masking element 2 defines a second zone 20.
• the edge of the temporary masking element forms a second contour 21 delimiting the second zone 20.
• the temporary masking member 2 is fully included within said first region 10. In other words, the second contour 21 does not have an intersection with the first contour 11.
• step B are sprayed the entire part of one side of a decoration coating 3 such that a paint.
• paint is coated workpiece Aspect 1, as well as temporary masking element 2 and the surface 30 between the second contour 21 defined by the temporary masking element 2, and the first contour 11 .
• step D using a short pulse laser (not shown), the decorative coating layer remaining is removed within the first area and corresponding to the surface 30 between the first contour 11 and the second contour 21.
• steps C and D we obtain an identical configuration, illustrated in FIG. FIG. 4, in which all the paint present in the first zone 10 delimited by the first contour 11 has been removed.
• the pulse laser source used to perform this cleaning operation may be of the CO 2 laser type, semiconductor laser or fiber laser.
• the peak output power of the laser is between 25W and 1000W and preferably between 50W and 300W.
• the laser emits pulses of the order of a few nanoseconds at a frequency that can range from a few tens of Hz up to 25 KHz, and preferably at a frequency of the order of 20 KHz.
• the wavelength of the emitted light varies depending on the type of laser used.
• a laser NdYAG solid type semiconductor device emitting light of a wavelength of 1064 nm, a fiber laser emitting light at a wavelength between 900nm and 10OOnm, or a CO 2 laser emitting light whose wavelength is between 9000nm and 12000nm.
• [0035] is adjusted the mirrors and lenses of the optical device so that the focal diameter of the light beam at the impingement of said beam on the workpiece surface in appearance is between 0.1 mm and 0.5 mm.
• a control means (not shown) having stored therein the shape and position in space of the first and second contour, controls the galvanometric head according displacement strategies adapted to remove the coating layer decor the surface 30 in the shortest possible time and with the best precision, particularly at the edge forming the first contour 11. Also, the smaller the distance between the first and the second contour, the longer the duration of this operation is weak.
• Edge 21 of the temporary masking member defining a second contour.

Landscapes

• Physics & Mathematics (AREA)
• Optics & Photonics (AREA)
• Engineering & Computer Science (AREA)
• Plasma & Fusion (AREA)
• Mechanical Engineering (AREA)
• Application Of Or Painting With Fluid Materials (AREA)
• Laser Beam Processing (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=60955250

Family Applications (1)

Country Status (4)

Family Cites Families (7)

• 2017
  • 2017-11-06 FR FR1760400A patent/FR3073156B1/fr not_active Expired - Fee Related
• 2018
  • 2018-11-05 WO PCT/EP2018/080083 patent/WO2019086644A1/fr unknown
  • 2018-11-05 CN CN201880072961.XA patent/CN111328297A/zh active Pending
  • 2018-11-05 EP EP18793687.7A patent/EP3706922A1/fr not_active Withdrawn

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