WO2021228608A1 - Fabrication d'un radôme pour un véhicule automobile - Google Patents

Fabrication d'un radôme pour un véhicule automobile Download PDF

Info

Publication number
WO2021228608A1
WO2021228608A1 PCT/EP2021/061595 EP2021061595W WO2021228608A1 WO 2021228608 A1 WO2021228608 A1 WO 2021228608A1 EP 2021061595 W EP2021061595 W EP 2021061595W WO 2021228608 A1 WO2021228608 A1 WO 2021228608A1
Authority
WO
WIPO (PCT)
Prior art keywords
blank
spray material
cavity
spray
injection
Prior art date
Application number
PCT/EP2021/061595
Other languages
German (de)
English (en)
Inventor
Axel Lekscha
Andreas VON RIEWEL
Original Assignee
Heyco IML Kunststofftechnik GmbH & Co.KG
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 Heyco IML Kunststofftechnik GmbH & Co.KG filed Critical Heyco IML Kunststofftechnik GmbH & Co.KG
Publication of WO2021228608A1 publication Critical patent/WO2021228608A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1671—Making multilayered or multicoloured articles with an insert
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14778—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the article consisting of a material with particular properties, e.g. porous, brittle
    • B29C45/14811—Multilayered articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1642—Making multilayered or multicoloured articles having a "sandwich" structure
    • B29C45/1643—Making multilayered or multicoloured articles having a "sandwich" structure from at least three different materials or with at least four layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1679—Making multilayered or multicoloured articles applying surface layers onto injection-moulded substrates inside the mould cavity, e.g. in-mould coating [IMC]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/34—Electrical apparatus, e.g. sparking plugs or parts thereof
    • B29L2031/3456—Antennas, e.g. radomes

Definitions

  • the present invention relates to a method for producing a cover for a radar device, a radome, for a motor vehicle.
  • Radar devices are increasingly used in motor vehicles, especially in the course of automating motor vehicles, in order to measure distances to objects and / or other road users and / or a relative speed of the motor vehicle relative to an object or other road users.
  • the data collected accordingly by the radar device are then used to signal possible dangers to the driver of the motor vehicle or directly to control at least individual functions of the motor vehicle. Since the motor vehicle is used in various environments, protection of the radar device from environmental influences such as moisture, corrosive chemicals and the like is inevitable.
  • covers are known which close an opening in the surface of the motor vehicle in which at least one antenna of the radar device is formed. These covers are usually constructed from a material to include a plastic that is at least partially continuous for electromagnetic waves with Wel lendorfn in the radar range.
  • the invention is based on the object of overcoming the disadvantages known from the prior art and, in particular, of specifying a method for producing a cover for a radar device which reduces the rejects produced. This problem is solved with the features of the independent claim. Advantageous further developments are the subject of the dependent claims.
  • the method according to the invention for producing a cover for a radar device in a motor vehicle comprises the following steps: a) inserting a blank comprising a plastic film into an injection mold, so that the blank lies against a core of the injection mold; b) closing the injection mold, so that a first cavity for the protrusion of the blank adjacent to the core is formed, so that the first cavity is formed on a first side of the blank opposite the core; c) Introducing the first spray material into the cavity to form a pre-sprayed blank, the first spray material being introduced into the first cavity on one side from a spray material supply and the first cavity being designed so that the first spray material hits an impact element before it moves in the direction is diverted to the blank and forms a first layer of plastic there.
  • the cover is particularly suitable and intended for closing an opening in a surface of the motor vehicle, so that in the installed state at least one antenna of a radar device is formed in the opening, covered by the cover.
  • the cover protects the radar device and, in particular, protects at least one antenna of the radar device from environmental influences to which the motor vehicle is exposed, for example in the form of moisture, snow, corrosive chemicals, etc.
  • the first spray material preferably comprises a plastic, in particular a polycarbonate (PG) and / or an acrylonitrile-butadiene-styrene copolymer (ABS).
  • the plastic film is in particular a multilayer plastic film.
  • step a) the plastic film is placed in the injection mold against a core of the injection mold and, if necessary, deformed in the process. Then this takes place in step b) Closing the injection mold which forms a first cavity on a side of the blank which is opposite the core of the injection mold.
  • the plastic film may be deformed.
  • the plastic film can already be deformed before step a) so that a certain geometry is achieved.
  • the cover can be shaped so that it can be used in a radiator grille of a motor vehicle, for example in the form of a brand emblem of the manufacturer of the motor vehicle.
  • the blank or the pre-sprayed blank can, for example, be lacquered on one or both sides in one or more layers, for example with a layer of colored lacquer and / or a layer of protective lacquer.
  • Metallic-looking surfaces can be applied to the blank at least in partial areas, optionally before step a) or already contained in the plastic film.
  • the metallic appearance can be created by applying shiny metallic discrete points on or in at least partial areas of the plastic film and / or by utilizing surface effects in the case of multilayered plastic films. A two-dimensional application of a metallic layer is not provided, since this results in excessive attenuation of the electrical radiation that the radar device sends and receives, which limits the functionality of the radar device.
  • the first plastic layer is injection molded in front of the blank.
  • the first spray material is plasticized and then introduced into the first cavity.
  • the first spray material is fed into the first cavity on one side by a spray material feed, which is preferably above the blank in the direction of gravity, and the first cavity is designed so that the first spray material first hits a Prallele element before it moves in the direction of the blank is diverted and forms a first plastic layer there.
  • the first spray material is not applied directly to the blank. This leads to a lower likelihood of that the blank is at least partially detached from the core of the injection mold.
  • the scrap produced with the method according to the invention is significantly lower, since a partial rearrangement of the blank or the plastic film, which leads to creasing of the plastic film, making the pre-injected blank unusable, is at least reduced by step c).
  • a rerouting of the first spray material before it is rerouted in the direction of the blank enables a method to be carried out in which the edge of the blank is also enclosed by the first spray material and thus protected from environmental influences.
  • the diversion of the first spray material improves the optical quality of the cover, since without this diversion the structure of the cover is less homogeneous, since the area where the first spray material is sprayed on is clearly visible in the case of blanks that are directly molded onto the cover. This is avoided by carrying out the process in accordance with the invention.
  • the plastic film is preferably designed in multiple layers. This allows the construction of blanks whose properties, especially optical properties, can be adjusted. At the same time it has been found that plastic films with more layers tend to crease, so that the method proposed here facilitates the construction of covers for radar devices based on multilayer plastic films.
  • a second spray material is applied to form a second plastic layer on the second side of the pre-sprayed blank opposite the first plastic layer.
  • the blank is pre-injected and after step c) the blank is back-injected, which enable the blank to be protected on both sides.
  • a combined pre- and back injection allows a variable design of the cover, which can be adapted to different areas of application (with regard to the protection of the blank, the design of the radar device, the design direction of the motor vehicle) and can also be adapted to various optical requirements.
  • the core of the injection mold is preferably displaced before the second injection molding material is introduced, so that a second cavity is created for receiving the second injection molding material.
  • the first spray material and the second spray material each comprise at least one plastic. At least one of the spray materials is preferably: the first spray material and the second spray material selected from at least one of the following materials: a) polycarbonate; and b) acrylonitrile-butadiene-styrene copolymer.
  • PC and ABS are examples of PC and ABS for both the first and the second plastic layer.
  • the mixing ratios between PC and ABS can be selected depending on the application, for example a mixture of 80% by weight PC and 20% by weight ABS is possible.
  • At least one of the spray materials is preferably mixed with a dye, the first spray material and the second spray material, so that the visual appearance of the cover can be influenced.
  • first and / or the second plastic layer post-processing of the pre-injected blank or the pre-injected and rear-injected blank may be necessary, for example deburring or post-processing of the edges in order to be able to produce cover, for example, within certain tolerances.
  • the first and / or second spray material are preferably thermoplastic.
  • the first spray material is preferably fed into the first cavity on one side from the spray material feed, which is above the blank in the direction of gravity.
  • the injection molding of the blank preferably takes place from above in the direction of gravity. It has been found that this further reduces the probability that the blank will at least partially detach from the core of the injection mold.
  • first primarily (only) serve to differentiate between several similar objects, sizes or processes, i.e. in particular no dependence and / or sequence of these objects , Sizes or processes for each other. Should a dependency and / or sequence be necessary, this is explicitly stated here or it is obvious to a person skilled in the art when studying the specifically described embodiment.
  • FIG. 1 shows a detail of an example of an injection mold with an inserted
  • FIG. 1 shows a detail of an example of an injection mold 1 for producing a cover for a radar device in a motor vehicle, also called radome ge.
  • the cover is made by injection molding or multi-component injection molding with one or more, at least one plastic comprising the injection molding materials.
  • the injection mold 1 comprises a core 2 on which a blank 3 rests.
  • the blank 3 is formed from a plastic film, which is preferably multilayered.
  • a first cavity 5 is formed, which is filled with a first injection molding material 6 in the context of the injection molding process to create a first plastic layer that fills the first cavity 5.
  • the first spray material 6 is preferably a thermoplastic, in particular PC and / or ABS.
  • the first spray material 6 is not gelei tet directly on the blank 3, rather the first spray material 6 first hits a baffle element 7, wel Ches causes a diversion of the first spray material 6 by 90 ° and more, before the first spray material 6 in the The area of the first cavity 5, in which the blank 3 rests against the core 2, occurs. A displacement and / or deformation of the blank 3 by the first spray material 6 is thus avoided.
  • a spray material feed 8, through which the first spray material 6 is guided into the first cavity 5, is formed in the direction of gravity 8 above the blank 3, so that the introduction of the first spray material 6 does not work against the effect of gravity but with the effect the force of gravity 9 takes place.
  • Fig. 2 shows a section of the injection mold 1 after the core 2 has been relocated to create a second cavity 10, which is used for back injection with a second injection molding material to form a second plastic layer as part of an injection molding process.
  • the back-injection takes place after the pre-injection, so that a pre-injected blank 11 comprising the blank 3 and a first plastic layer 12 is in front on a first side 13 of the blank 3. lies.
  • the second cavity 10 lies on a second side 14 of the blank 3, which is opposite the first side 13 of the blank 3.
  • the second spray material can be fed in from any direction, but preferably also through the spray agent feed 8 from FIG. 1.
  • the second spray material is a thermoplastic, in particular PC and / or ABS.
  • the invention is based on an indirect injection of a blank 3 comprising a plastic film with a first spray material 6, in which the first spray material 6 is fed through a spray medium feed 8 and then first hits an impact element 7, which deflects the first spray material 6 towards the blank 3 causes.
  • the spray agent feed 8 is aligned in such a way that it lies above the blank 3 in the direction of gravity 9.
  • the method according to the invention reduces the scrap that arises from an at least partial deformation and / or displacement of the blank 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Details Of Aerials (AREA)

Abstract

L'invention concerne le moulage indirect d'une ébauche (3) comprenant une feuille de plastique présentant un premier matériau d'injection (6), dans lequel le premier matériau d'injection (6) est alimenté par une alimentation en milieu d'injection (8), puis frappe initialement un élément déflecteur (7), ce qui amène le premier matériau d'injection (6) à être dévié vers l'ébauche (3). L'alimentation en milieu d'injection (8) est de préférence orientée de telle sorte qu'elle est située au-dessus de l'ébauche (3) dans la direction de la force gravitationnelle (9). Le procédé selon l'invention réduit les déchets résultant d'une déformation et/ou d'un décalage au moins partiels de l'ébauche.
PCT/EP2021/061595 2020-05-12 2021-05-03 Fabrication d'un radôme pour un véhicule automobile WO2021228608A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020112790.1 2020-05-12
DE102020112790.1A DE102020112790A1 (de) 2020-05-12 2020-05-12 Herstellung eines Radoms für ein Kraftfahrzeug

Publications (1)

Publication Number Publication Date
WO2021228608A1 true WO2021228608A1 (fr) 2021-11-18

Family

ID=75888002

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2021/061595 WO2021228608A1 (fr) 2020-05-12 2021-05-03 Fabrication d'un radôme pour un véhicule automobile

Country Status (2)

Country Link
DE (1) DE102020112790A1 (fr)
WO (1) WO2021228608A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006046436B3 (de) 2006-09-25 2008-04-30 Decoma (Germany) Gmbh Abdeckelement
DE102014214329A1 (de) * 2014-07-23 2016-01-28 Conti Temic Microelectronic Gmbh Radarvorrichtung
DE102015218876A1 (de) * 2015-09-30 2017-03-30 Hella Kgaa Hueck & Co. Verfahren zur Herstellung eines Radoms und ein solches Radom

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1704035A4 (fr) 2003-12-31 2011-05-04 Int Automotive Components Stratification de produits decoratifs, dans le moule
DE102004040942A1 (de) 2004-08-24 2006-03-16 Lisa Dräxlmaier GmbH Verfahren und Vorrichtung zur Herstellung von Zierteilen
DE102010053106A1 (de) 2010-12-01 2012-06-06 Faurecia Innenraum Systeme Gmbh Verfahren und Werkzeugvorrichtung zur Herstellung eines Innenraum-Verkleidungsteils

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006046436B3 (de) 2006-09-25 2008-04-30 Decoma (Germany) Gmbh Abdeckelement
DE102014214329A1 (de) * 2014-07-23 2016-01-28 Conti Temic Microelectronic Gmbh Radarvorrichtung
DE102015218876A1 (de) * 2015-09-30 2017-03-30 Hella Kgaa Hueck & Co. Verfahren zur Herstellung eines Radoms und ein solches Radom

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Publication number Publication date
DE102020112790A1 (de) 2021-11-18

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