EP3804927A1 - Verfahren zum schneiden einer folie aus kunststoffmaterial, und entsprechende vorrichtung - Google Patents

Verfahren zum schneiden einer folie aus kunststoffmaterial, und entsprechende vorrichtung Download PDF

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Publication number
EP3804927A1
EP3804927A1 EP20197965.5A EP20197965A EP3804927A1 EP 3804927 A1 EP3804927 A1 EP 3804927A1 EP 20197965 A EP20197965 A EP 20197965A EP 3804927 A1 EP3804927 A1 EP 3804927A1
Authority
EP
European Patent Office
Prior art keywords
cutting
sheet
plastic film
sonotrode
wire
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Withdrawn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
EP20197965.5A
Other languages
English (en)
French (fr)
Inventor
David Tresse
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.)
Plastic Omnium SE
Original Assignee
Plastic Omnium SE
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 Plastic Omnium SE filed Critical Plastic Omnium SE
Publication of EP3804927A1 publication Critical patent/EP3804927A1/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/01—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
    • B26D1/547—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a wire-like cutting member
    • B26D1/5475—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a wire-like cutting member for thin material, e.g. for sheets, strips or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F3/00—Severing by means other than cutting; Apparatus therefor
    • B26F3/06—Severing by using heat
    • B26F3/08—Severing by using heat with heated members
    • B26F3/12—Severing by using heat with heated members with heated wires
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/01—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
    • B26D1/547—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a wire-like cutting member
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D7/01—Means for holding or positioning work
    • B26D7/015—Means for holding or positioning work for sheet material or piles of sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D7/08—Means for treating work or cutting member to facilitate cutting
    • B26D7/086—Means for treating work or cutting member to facilitate cutting by vibrating, e.g. ultrasonically
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
    • B26F1/38—Cutting-out; Stamping-out
    • B26F1/3806—Cutting-out; Stamping-out wherein relative movements of tool head and work during cutting have a component tangential to the work surface

Definitions

  • the invention relates to the field of decoration or treatment of motor vehicle body part. More particularly, the invention relates to a method for cutting a sheet of plastic film previously deposited on a body part. Such a sheet of plastic film can be used in particular to operate a partial masking, prior to a subsequent finishing or assembly operation, or to decorate the bodywork part. Such masking may be intended to preserve an area from spraying paint or even to preserve a future bonding track, for example.
  • the masking operations consist in depositing sheets of film of small dimensions at locations located on the part to be painted.
  • the installation is complex and is most often done manually.
  • it is necessary that at least one edge of the masking tape or film is positioned very precisely at the limit of zones, along a relief or an embossing of the part, such as for example a groove, a style edge, a natural edge of the part.
  • Positioning of a strip or sheet of a masking film could be carried out using a robot in order to have a precise reference point with respect to the part receiving the masking. Positioning a sheet of thin film using a robot appears complex, again, given the flexibility of the film and the formation of folds.
  • the object of the invention is in particular to increase the precision of cutting a sheet of film of plastic material, in particular in the case of a masking operation prior to painting an automobile part.
  • the present invention relates to an ultrasonic device for the "in-situ" cutting of a sheet of plastic film after it has been deposited on a bodywork part, the device comprising a sonotrode and being able to be mounted on a controlled mechanism, the device comprising a sonotrode.
  • sonotrode having a cutting end with a substantially flat surface forming a sole provided with a localized element forming a protuberance (or projection) and protruding from the flat surface by a height substantially equal to the thickness of the sheet of film, the element localized forming outgrowth being ideally free of movement.
  • the ultrasonic device for cutting a sheet of film may further include one or more of the following features, considered alone or in combinations:
  • the localized element forming a protuberance is a metal wire, free to move (in rotation) under the sonotrode, which advantageously allows positioning automatically tangent to the predefined cutting path and brings great precision to the cut.
  • the metal wire has a diameter of between 50 and 400 micrometers.
  • the wire of reduced diameter is flexible and made mobile and is freely orientable under the sonotrode, which also gives it characteristics of flexibility and resistance suitable for ultrasonic cutting.
  • the device is configured to operate a renewal of the wire by automatic unwinding of a spool, the unwinding being continuous or discontinuous.
  • this makes it possible to renew the portion of wire making a cutting of the sheet of plastic film by ultrasound after a predefined number of cuts of parts and avoids carrying out cutting operations with a portion of wire that is too worn.
  • the invention also relates to a method for cutting a sheet of plastic film deposited on a part, by means of a device as mentioned above.
  • the sheet of plastic film is thus cut directly from the part and not precut on a cutting frame or an anvil, which has the advantage of avoiding transfer. It is thus possible to cut a sheet of plastic film of the same thickness as the wire, which is particularly advantageous for masking in the case of an application linked to the painting of an automobile part. .
  • the method of cutting a sheet of plastic film according to the invention may also include one or more of the following characteristics, considered alone or in combinations:
  • the method comprises depositing a sheet of plastic masking film on a part prior to a relative movement of the sonotrode and of the part along a predetermined cutting path.
  • the method uses a wire of diameter substantially equal to the thickness of the sheet of plastic film.
  • the correspondence of the diameter of the wire and the thickness of the sheet of material to be cut makes it possible to easily and quickly remove any leftovers inside or outside the contour of the part formed after cutting. , or more broadly the portions of the film sheet not being useful for masking.
  • the process uses a wire with a diameter greater than the thickness of the sheet of plastic film. It is therefore possible to form a groove in the support part, of a depth less than the diameter of the wire, in correspondence of the contour of a mask formed after cutting, in the case of an application linked to painting. of the support part, the groove making it possible to better delimit the painted area from the unpainted area.
  • the method uses a wire having a length of between 8 and 15 mm, preferably 10 mm.
  • a length advantageously confers great flexibility and great mobility of the wire, with regard to its diameter, so as to optimize free positioning along a tangent to the predetermined cutting path.
  • the method comprises a step of removing a cut sheet of film, painting or gluing of the part, and removal of the rest of the film sheet in the case of a masking operation or else an overmolding or a coating of varnish on the cut sheet of film in the event that the cut sheet of film remains on the part for decorative purposes.
  • the invention finally relates to a bodywork part comprising a sheet of cut plastic film and / or a groove hollowed out along a predetermined path, obtained by a cutting process as described above.
  • the figure 1 illustrates a device 1 for cutting a sheet of plastic film 3 deposited on a bodywork part 5.
  • the device 1 for cutting comprises a sonotrode 7 moved by a robot 9.
  • the sonotrode 7 is conventionally made of metal, for example example in titanium, aluminum or steel, or in any other material suitable for its function.
  • the sonotrode 7 may or may not have been heat treated. It is configured to restore vibrational energy to its tip.
  • the sonotrode 7 has a longitudinal axis 71, substantially orthogonal to the part during cutting.
  • the sonotrode 7 has a cutting end 73 (visible on the figures 2 , 3a and 3b ) with a flat or substantially flat surface cleverly provided with a localized element 11 forming a protuberance projecting under the flat surface by a height substantially equal to the thickness of the sheet of plastic film 3.
  • the element 11 is a wire strand or metal cutting strand free to move, in angular orientation, in the space around the longitudinal axis 71 of the sonotrode 7.
  • the term “cutting strand” is understood here to mean the active / protruding portion under the sole of the sonotrode.
  • the metal wire can be made of copper, for example, and can be wound on a reel.
  • the cutting strand (element 11) has an axial symmetry with respect to the axis 71 and has for example the shape of a pin, of a stud or of a hemisphere of equal height. to the thickness of the plastic film sheet 3, compared to the flat or substantially flat cutting surface.
  • the element 11 is positioned angularly regardless of the shapes of the cutting path, without it being necessary to subject this angular position by specific control of the driven mechanism (robot).
  • the vibrations in the form of ultrasound are transmitted to the sonotrode 7 into the element 11 forming a protuberance on the flat or substantially flat surface of the cutting end 73.
  • the vibrations transmitted to the element 11 forming a protuberance create a heating effecting a cutting of the sheet of film 3 deposited on the body part 5.
  • the robot 9 moves the element 11 along a predetermined path such as the path 13, and a cutting of the sheet of plastic film 3 deposited on the body part 5 is made in accordance with this path.
  • the various actuators of the robot 9 useful for setting in motion are not shown because they are not useful for understanding the invention. It may be, for example, a conventional industrial robot carrying the sonotrode 7.
  • the use of an element 11 forming a protuberance on the flat surface of the cutting end 73 of the sonotrode 7 advantageously eliminates the need to control the orientation of a cutting tool, such as a blade or a rectangular knife, for example, to follow a predetermined cutting path.
  • the cutting precision is consequently increased and the robot 9 is simplified since it is thus possible to avoid having to control a movement of the element 11 forming a cutting tool, around the longitudinal axis 71 of the sonotrode 7.
  • the advantages will be explained through the detailed description of the figure 8 .
  • the precision of the cut is obtained by the positioning precision due to the robot alone and by the sharpness of the cut performed locally by the element 11, for example due to the fineness of the wire and its free positioning when the element 11 is a portion of thread.
  • an ultrasound generator 7 ' is configured to operate at a frequency between 20 and 120 KHz, preferably between 50 and 90 KHz, more preferably at 70 KHz or at a very close frequency of 70 KHz and the element 11 is a strand of copper wire with a diameter of between 50 and 400 micrometers and a length of between 5 and 20 mm, preferably between 8 and 15 mm, more preferably equal to 10 mm .
  • length of the strand is understood here to mean the portion of wire situated between the flat or substantially flat surface of the cutting end 73 of the sonotrode 7 and the end of the strand. This portion of wire is free to move. The wire then has a diameter, a length, a flexibility and a mobility around the longitudinal axis 71 of the sonotrode 7 such that the resulting cutting fineness is consequently increased.
  • the mobility of the localized element 11 produced in the form of a metal wire of small diameter is particularly advantageous since it gives the cutting element 11 an ability to position itself freely tangentially to the predetermined cutting path, i.e. trajectory 13 in the example illustrated on figure 1 .
  • the cutting precision thus obtained is particularly suitable for finishing or assembly operations of automotive parts, such as a smoothing operation prior to painting the part 5 shown in figure. figure 1 .
  • an appearance part has one or more areas to be protected which must remain free of paint. This is the case, for example, with areas intended to be transparent making it possible to provide backlighting, or else areas provided for carrying a decorative element, or else areas provided for fixing one aspect part to another by gluing. It is then necessary to be able to delimit very precisely painted areas and unpainted areas, for example.
  • the device 1 according to the invention is particularly suitable for masking operations aimed at delimiting such areas.
  • a masking method consists in using the device 1 to cut a sheet of plastic masking film 3 and thus delimit an area to be painted, outside the predetermined path 13 and an area not to be painted, to inside the path 13, or vice versa.
  • the part of the cut-out sheet of masking film 3 to be removed prior to spraying paint is that inside path 13 or that outside of path 13.
  • the use of the device 1 for cutting the sheet of plastic film 3 deposited on the automotive part 5 comprises a preliminary step of depositing one (or more) sheets of plastic film 3 of large dimensions capable of widely covering and of '' one (or more) zones located on the surface of the part 5, then a relative displacement of the sonotrode 7 with respect to the part 5, on the visible face of the part 5, so that the element 11 protuberance forms a path on the sheet of plastic film 3 along the predetermined path 13 (which is a cutting path).
  • the removal of the sheet of plastic film 3 can be carried out by adhesive bonding or by taking advantage of the electrostatic effect which keeps the sheet of plastic film 3 stationary on the part 5.
  • a sheet of plastic film is conventionally an almost rectangular section of film, produced and deposited directly from a distribution roll, then cut to length when the area to be protected is completely covered.
  • the film can thus be cut into sheets, in the width of the roll, without other precautions.
  • Precise cutting of the sheet according to a predetermined path 13 then being done by the displacement of the sonotrode 7 along the predetermined path 13 of cutting.
  • the cutting end 73 flat or substantially flat, is kept in contact with the sheet of plastic film 3, so that the localized element 11 forming protuberance cuts the sheet of film 3 along the path 13.
  • the cut is obtained by localized heating of the sheet of plastic film 3, due to the vibrations of the member forming the protuberance 11.
  • a wire with a diameter greater than the thickness of the sheet of plastic film 3 is used, which has the effect, in addition to carrying out a precise cutting of the sheet of plastic film 3, to form a groove 15 in the bodywork part 5, by heating the thermoplastic material of the part, under the effect of vibrations (the groove 15 is visible on the figure 3b ).
  • the groove 15 thus formed along the predetermined path 13 makes it possible to further delimit a painted zone from an unpainted zone since the groove is such as to slightly absorb the paint and thus to limit its diffusion by capillary action beyond the throat 15.
  • a step of smoothing the sheet of plastic film 3 is carried out prior to the step of relative displacement of the sonotrode and of the bodywork part 5.
  • This smoothing step is performed. for example carried out by means of a robot equipped with a smoothing means which is affixed to the part and travels the predetermined path 13 so as to remove or blur any defects potentially generated during the installation of the sheet of plastic film 3 on the bodywork part 5. These defects can be, for example, folds, bubbles.
  • the robot provided for this purpose, or any other equivalent actuator for example carries a smoothing means of the pad, brush or pad type, the flexibility of which is capable of crushing a bubble, smoothing out a fold or even pressing the sheet of plastic film without risk degrading it.
  • the device 1 for cutting the sheet of plastic film 3 used by the cutting process comprises means for replacing the useful portion of wire constituting the element forming the protuberance 11
  • the means for replacing the useful portion of the wire can be activated manually or automatically.
  • the means may be suitable for continuous or discontinuous unwinding of the wire.
  • the wire can be unwound towards the flat or substantially flat surface of the cutting end 73 of the sonotrode 7 through a groove (or distribution channel) hollowed out longitudinally or obliquely in the end of the sonotrode 5 and opening at the end of the sonotrode 5.
  • the wire unwinding means can be combined with cutting wire cutting means to cut a worn portion. It is thus possible to renew the portion of wire forming a protuberance after one or more cutting operations and to maintain the cutting precision by presenting a portion of wire not yet worn by cutting operations.
  • the figure 2 illustrates the sonotrode 7 used by the cutting device 1 according to the invention positioned in the immediate vicinity of a bodywork part 5 on which is deposited a sheet of plastic film 3 of dimensions greater than the dimensions of the part 5.
  • the end 73 of the sonotrode 7 has the element 11 located and forming a protuberance on the flat surface of the cutting end 73.
  • the element 11 is a wire positioned in the feed channel inside the sonotrode (visible on the figure 3a ) so that the wire is positioned perpendicularly or obliquely with respect to the cutting surface of the cutting end 73 at the point where the wire emerges from the internal groove to the sonotrode.
  • the wire is then automatically positioned parallel to the surface of the part and is naturally oriented in a direction forming a tangent to the cutting path during the movement of the sonotrode 7.
  • the characteristics of length, diameter and flexibility of the wire are cleverly defined so that during a relative movement of the sonotrode 7 and the part 5, the surface of the sonotrode 7 being in contact with the sheet of plastic film 3, the wire is free to move around the longitudinal axis 71 and is positioned freely tangentially to the path traversed by the cutting end 73 of the sonotrode 7 cutting the sheet of plastic film 3, due to the vibrations induced by the converter 7 '( ultrasound generator coupled to the sonotrode 7).
  • the figure 3a illustrates the sonotrode 7 already shown on the figure 2 , during a cutting operation of the sheet of plastic film 3.
  • the flat or substantially flat surface of the cutting end 73 is kept in contact with the sheet of plastic film 3 and the localized element 11 forming a protuberance , moved in vibrations, cuts the sheet of film 3 by localized heating of the latter.
  • the figure 3a shows a partial sectional view of the end of the sonotrode 7 showing an internal groove (or wire feed channel) opening onto the periphery of the sonotrode.
  • the element 11 can be kept blocked in the groove allowing its positioning or can be unwound continuously or discontinuously using unwinding means not shown on the figure 3a and adapted to operate a sliding of the wire in the wire feed channel of the sonotrode 7. It can be seen in this figure that the localized element 11 forming a protuberance makes a cut in the thickness of the sheet of plastic film 3.
  • the wire feed channel present is not perpendicular to the flat or substantially flat surface 73 of the sonotrode (the sole) but has an angle of the order of 10 at 40 degrees with the surface 73 of the sonotrode 7. This advantageously makes it possible to preserve the portion of wire forming a protuberance, useful for cutting the sheet of plastic film, from having to undergo mechanical stresses (folds, twists, etc. .) when the predetermined path 13 follows a main direction without exhibiting convolutions or too tight bends.
  • the wire feed channel thus inclined, and devoid of bends inside the sonotrode, prevents the wire from being too bent and further facilitates the “natural” positioning of the wire according to the predetermined path 13 .
  • the figure 3b shows the sonotrode 7 slightly set back from the part 5 on which the sheet of plastic film 3 is deposited at the end of a cutting operation carried out by a relative movement of the sonotrode 7 and of the part 5 during which the sonotrode has been maintained in contact with the sheet of plastic film 3 along a predetermined cutting path.
  • the groove thus defines two portions of the sheet of plastic film 3 after cutting, one or the other. other portions can be quickly detached from the part and without difficulty by a simple manual removal operation. The masking can thus be removed in one piece, without it fragmenting.
  • the figure 4 illustrates an example of a body part 5 of a motor vehicle and an example of a predetermined cutting path 13 defined to produce a smoothing and thus delimit an area to be painted outside the path 13 and an area to be preserved from painting, to inside the path 13.
  • the cutting path of a sheet of plastic film positioned for masking purposes corresponds to the limit of a painted area with respect to an unpainted area.
  • the figures 5, 6 and 7 illustrate successive stages of painting the bodywork part 5 (a bumper skin) implementing a masking using a cutting process according to the invention.
  • the cutting method according to the invention uses the device 1 shown in figure 1 .
  • the body part 5 is the part already shown on the figure 4 .
  • the figure 5 represents body part 5 after removal a sheet of plastic film 3 over the entire part (here the sheet of plastic film 3 is shown transparent).
  • the figure 6 shows the part being sprayed with paint on the areas to be painted, subsequent to cutting the plastic film 3 along the predetermined cutting path 13 and removing the portion of the plastic film sheet 3 outside the cutting path 13.
  • the portions of the sheet of plastic film 3 remaining after removal of the portions external to the paths 13 operate a masking such as to preserve from the spray of paint the areas of the bodywork part 5 excluded from the areas to be paint (ie the areas each still covered with a portion of plastic film sheet, in the shape of a "zigzag” in the figure).
  • the figure 7 shows the body part 5 after removing the remaining portions (in the form of a "zigzag") of the sheet of plastic film 3 of the body part, showing clear boundaries between the painted areas and the unpainted areas, according to the predetermined trajectories.
  • the figure 8 represents successive positions of cutting elements along a predetermined cutting path 13, different depending on whether the cutting element has an elongate or rectangular cutout shape on the one hand (element 110) or is free of movement ( item 11), on the other hand.
  • the sonotrode 7 is carried by an arm 91 of the robot 9. The connection between the arm 91 of the robot 9 and the sonotrode 7 is not articulated.
  • the left part of the figure 8 annotated 8a, illustrates successive positions of a cutting element 110 of rectangular shape which must be moved in rotation to adopt a position tangential to the path 13.
  • the successive orientations of the robot arm 91 illustrate the need to position the arm 91 and consequently the sonotrode 7 so that the cutting element 110 has a position oriented along a tangent to the path 13.
  • the right part of the figure 8 illustrates the successive positions of a cutting wire whose characteristics allow it to be free of movement and thus to position itself freely when the sonotrode which carries it travels the predetermined cutting path 13.
  • the cutting element is thus “indifferent” to the shape of the predetermined path 13. This is the case with an element of the cutting wire type, but also when the element forms a protuberance exhibiting symmetry along any axis perpendicular to the longitudinal axis of the sonotrode 7, that is to say a hemisphere, a pawn or a nipple, for example.
  • the arm 91 of the robot 9 can maintain the same orientation along the predetermined cutting path 13.
  • the invention is not limited to a cutting process for carrying out a masking operation, but to other operations such as decorating or preparing parts for assembly, for example.
  • the sheet of plastic film 3 can be cut from a decorative and / or luminous film, remaining on the body part, for example.
  • Plastic film can be manufactured to be made available in rolls of constant width (and predefined dimensions). It is provided so that its removal can be done in particular by adhesive bonding or that its maintenance on a body part uses the electrostatic effect. Its use and its cutting can be provided for overmolding purposes with another plastic material, in particular translucent, to prepare decorative elements for bodywork parts.
  • the device 1 is suitable for carrying out a precise cutting of a sheet of plastic film 3 deposited on the bodywork part 5.
  • the device 1 comprises the sonotrode 7 driven into vibrations by a generator. ultrasound 7 '.
  • the sonotrode 7 is mounted on the driven mechanism 9 (robot).
  • the sonotrode 7 of the device 1 for cutting a sheet of plastic film 3 has the cutting end with a flat surface 73 (also called the “sole”), which end is provided with a localized element 11 forming a protuberance and protruding. of the flat surface with a height substantially equal to the thickness of the sheet of plastic film 3.
  • the localized element 11 forming a protuberance is ideally free of movement, in particular around the longitudinal axis 71 of the sonotrode 7.
  • the localized element 11 forming a protuberance is a metal wire, for example made of copper, with a diameter of between 50 and 400 micrometers.
  • the device 1 can comprise means configured to operate a renewal of the portion of the wire forming a protuberance by continuous or discontinuous automatic unwinding of a spool.
  • the method according to the invention can use a wire with a diameter substantially equal to the thickness of the sheet of plastic film 3 or a wire with a diameter greater than the thickness of the sheet of plastic film 3.
  • a diameter wire greater than the thickness of the sheet of plastic film 3 the implementation of the method advantageously allows the formation of a groove 15 in the part 5 on which the sheet of plastic film 3 is placed.
  • the process for cutting the sheet of plastic film 3 uses a wire having a length of between 8 and 15 mm, preferably 10 mm.
  • a preliminary unitary geometric calibration step is implemented before the step of relative displacement of the sonotrode 7 and of the part 5.
  • the invention further relates to the bodywork part 5 obtained by the method described and comprising a groove in correspondence with a predetermined cutting path and / or a portion of plastic film sheet, overmolded or not and used for example for decorative purposes.
  • a bodywork part obtained by implementing the method according to the invention can be devoid of any embossing type relief, groove, edge or style edge along the predetermined cutting path 13, insofar as it is not necessary to identify oneself by such shapes arranged in a visible surface of the part in order to precisely define a cutting path, including when the latter is positioned “full skin” on a bodywork part.
  • the invention is not limited to the embodiments described above and relates more broadly to any device for cutting a plastic film or a sheet of plastic film deposited on a part, comprising a sonotrode mounted on a part. a controlled mechanism such as a robot, the sonotrode having a cutting end with a flat surface (sole) provided with a localized element forming a protuberance protruding from the flat surface by a height substantially equal to the thickness of the film or of the sheet of plastic film, the localized element forming a protuberance and being in the form of a pin, a stud, a hemisphere or ideally free of movement, such as a wire.
  • a controlled mechanism such as a robot
  • the sonotrode having a cutting end with a flat surface (sole) provided with a localized element forming a protuberance protruding from the flat surface by a height substantially equal to the thickness of the film or of the sheet of plastic film, the localized element forming a protuberance and being in the form
EP20197965.5A 2019-10-10 2020-09-24 Verfahren zum schneiden einer folie aus kunststoffmaterial, und entsprechende vorrichtung Withdrawn EP3804927A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1911289A FR3101804B1 (fr) 2019-10-10 2019-10-10 Procédé de découpe d’une feuille de film de matière plastique et dispositif associé

Publications (1)

Publication Number Publication Date
EP3804927A1 true EP3804927A1 (de) 2021-04-14

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EP20197965.5A Withdrawn EP3804927A1 (de) 2019-10-10 2020-09-24 Verfahren zum schneiden einer folie aus kunststoffmaterial, und entsprechende vorrichtung

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EP (1) EP3804927A1 (de)
CN (2) CN212859777U (de)
FR (1) FR3101804B1 (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2087290A (en) * 1980-11-14 1982-05-26 Gerber Garment Technology Inc Ultrasonic apparatus and method for cutting sheet material
US5100270A (en) * 1990-03-06 1992-03-31 Artistic Mat, Inc. Apparatus and method for cutting mat board
EP1932636A1 (de) * 2005-10-04 2008-06-18 Nihon Shoryoku Kikai Co., Ltd. Ultraschall-abschneidevorrichtung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2087290A (en) * 1980-11-14 1982-05-26 Gerber Garment Technology Inc Ultrasonic apparatus and method for cutting sheet material
US5100270A (en) * 1990-03-06 1992-03-31 Artistic Mat, Inc. Apparatus and method for cutting mat board
EP1932636A1 (de) * 2005-10-04 2008-06-18 Nihon Shoryoku Kikai Co., Ltd. Ultraschall-abschneidevorrichtung

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FR3101804A1 (fr) 2021-04-16
CN212859777U (zh) 2021-04-02
CN112643793A (zh) 2021-04-13
FR3101804B1 (fr) 2022-01-28

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