EP2552663A1 - Procédé de fabrication d'une pièce moulée renforcée de fibres continues comportant l'utilisation d'un outil de moulage par injection - Google Patents

Procédé de fabrication d'une pièce moulée renforcée de fibres continues comportant l'utilisation d'un outil de moulage par injection

Info

Publication number
EP2552663A1
EP2552663A1 EP11711458A EP11711458A EP2552663A1 EP 2552663 A1 EP2552663 A1 EP 2552663A1 EP 11711458 A EP11711458 A EP 11711458A EP 11711458 A EP11711458 A EP 11711458A EP 2552663 A1 EP2552663 A1 EP 2552663A1
Authority
EP
European Patent Office
Prior art keywords
injection
tool
preform
cavity
plastic material
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Withdrawn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
EP11711458A
Other languages
German (de)
English (en)
Inventor
Franz Kind
Peter Michel
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.)
Rehau Automotive SE and Co KG
Original Assignee
Rehau AG and Co
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 Rehau AG and Co filed Critical Rehau AG and Co
Publication of EP2552663A1 publication Critical patent/EP2552663A1/fr
Withdrawn legal-status Critical Current

Links

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
    • B29C45/14—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
    • B29C45/14786—Fibrous material or fibre containing material, e.g. fibre mats or fibre reinforced material
    • 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
    • B29C45/02—Transfer moulding, i.e. transferring the required volume of moulding material by a plunger from a "shot" cavity into a mould cavity
    • 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
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/53—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston
    • 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
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/40—Shaping or impregnating by compression not applied
    • B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
    • B29C70/46—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs
    • B29C70/48—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs and impregnating the reinforcements in the closed mould, e.g. resin transfer moulding [RTM], e.g. by vacuum
    • 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
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
    • B29C70/546—Measures for feeding or distributing the matrix material in the reinforcing structure
    • 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
    • B29C2045/1486—Details, accessories and auxiliary operations
    • B29C2045/14868—Pretreatment of the insert, e.g. etching, cleaning
    • B29C2045/14877—Pretreatment of the insert, e.g. etching, cleaning preheating or precooling the insert for non-deforming purposes
    • 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
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/27—Sprue channels ; Runner channels or runner nozzles
    • B29C45/2701—Details not specific to hot or cold runner channels
    • B29C45/2703—Means for controlling the runner flow, e.g. runner switches, adjustable runners or gates

Definitions

  • the present invention relates to a method of making a continuous fiber reinforced molded article using an injection molding tool.
  • the present invention has for its object to provide a method for producing a continuous fiber-reinforced molded part using an injection molding tool with which an endless fiber-reinforced molded part with complex geometry can be produced, which has a significantly higher manufacturing quality compared to a molded part produced by a known method ,
  • This object is achieved with a method for producing a continuous fiber-reinforced molded part using an injection molding tool having the features of claim 1.
  • the method according to the invention comprises the following steps:
  • step G flowable thermoplastic material is introduced from outside the injection molding tool into the metering space.
  • step H the final forming of the molded article from the preform then takes place by injecting flowable thermoplastic synthetic material from outside the injection molding tool into the cavity filling space remaining after introduction of the preform and by additionally injecting the thermoplastic flowable plastic material into the filling space .
  • the plastic material is injected from outside the injection molding tool via the first injection channel and for injecting the additional plastic material of the dosing chamber, the injection device is activated, which injects the flowable thermoplastic material located in the dosing chamber via the second injection channel into the cavity.
  • step I the molding is removed from the cavity.
  • the second tool part is provided with an injection system comprising the metering space and the injection device.
  • a second tool part with this injection system, which may preferably be in the form of a so-called "shot-pot" device, it is possible to significantly shorten the injection paths required in known solutions Injection device via the second injection channel of the second tool part in the filling cavitated in the cavity.
  • long injection paths which extend from the first to the second tool part and which are provided for supplying the example of an injection unit in the first tool part introduced plastic material to areas of the filling space, which are located in the second tool part, can thus be dispensed with.
  • the injection system of the second tool part the length of the longest injection paths or injection channels can be significantly reduced compared to known solutions. In particular, the length differences between the respective injection paths can thus be significantly reduced, so that thermoplastic material injected via different injection paths can enter the filling space with essentially the same flow properties or the same temperature.
  • an external spraying system comprising a plasticizing unit for producing the flowable thermoplastic material and an injection unit for feeding the plastic material
  • a plasticizing unit for producing the flowable thermoplastic material and an injection unit for feeding the plastic material
  • an injection unit for feeding the plastic material can be effectively reduced in terms of its maximum power dimensioning or performance data, so that by means of the inventive method also a reduction in production costs is made possible.
  • an endless fiber-reinforced molded part with complex geometry and high production quality can be produced with the method according to the invention.
  • the first tool part is fixed and the second tool part is movable for introducing the preform into the cavity relative to the first tool part.
  • the preform can be introduced in a practical manner by appropriate movement of the second tool part in the cavity of the injection molding tool or removed therefrom.
  • a large number of preforms for producing a corresponding multiplicity of molded parts can thus be introduced into or removed from the cavity in a practical manner.
  • step H to achieve the highest possible manufacturing quality of the molded part, the injection of the plastic material from outside the injection mold is carried out substantially simultaneously with the injection of the located in the metering Kunststoffstoffmaterials.
  • step G is carried out during cooling of the preform after the heating carried out in step E. In this way, the time to be reserved for cooling the preform can advantageously be used to carry out step G without having to specifically provide process time or process time.
  • the injection molding tool has at least one feed line which fluidly connects the first injection channel with the metering, wherein in step G flowable thermoplastic plastic material from outside the injection mold by injecting the plastic material into the first injection channel and by redirecting the injected plastic material is introduced into the feed line into the metering space, and wherein the feed line is closed before, according to step H, the flowable thermoplastic material is injected into the filling space.
  • thermoplastic material By means of the feed line, the thermoplastic material can be introduced in a practical manner via the first injection channel into the metering chamber, so that only a single injection unit to be provided in the vicinity of the injection tool for supplying the plastic material is to be provided.
  • the second tool part at least two injection devices, at least two metering chambers, each associated with one of the injection devices, and at least two second injection channels, each one of the second injection channels opens into a respective metering and each set up the injection devices is to inject thermoplastic material from the associated dosing into the cavity, and wherein in step G in each of the dosing introduced flowable thermoplastic material and in step H, the flowable thermoplastic material located in each dosing is injected into the filling space.
  • the first tool part has a plurality of first injection channels, and in the vicinity of the injection molding tool at least two injection units are provided which are adapted to inject the flowable thermoplastic material from outside into at least one of the first injection channels. Also, by means of this practical embodiment, very short injection paths can be realized due to the provision of at least two injection units, so that moldings with very complex geometry can be produced with high production quality.
  • Fig. 1 shows schematically a plant for carrying out the method according to the invention
  • Fig. 2, 3 are each a schematic representation of an embodiment of a
  • Cut-to-size, substantially flat, unidirectional fiber-reinforced mats 2 are provided with a thermoplastic matrix at least partially surrounding the fibers ,
  • the mats 2 are taken from the magazine 3 from a magazine and provided at a predetermined position.
  • the provision of the mats 2 via a rolling and / or cutting unit done (not shown here).
  • the mats 2 are at least partially preheated before depositing on a workpiece carrier 5 with the aim of increasing the flexibility of the mats 2. This is followed by a transfer of the mats 2 to a workpiece carrier 5 which predetermines the rough contour 4 of the molded part 1.
  • the workpiece carrier 5 itself is moved on a conveyor track 13.
  • the cut mats 2 are deposited and continuously constructed into a three-dimensional preform 6 in such a way that the fiber orientation of the mats 2 affects the forces acting in the subsequent use of the molded part 1, and the load paths resulting therefrom within the molded part 1, is agreed.
  • the transfer, storage and erection of the preform 6 take over a plurality of robot stations or robot systems 14, which are arranged along the conveyor line 13.
  • the mats 2 are fixed in position relative to one another. In this case, the position fixation by means of a laser welding system 7, wherein a laser optics (not shown in detail) is arranged at a further robot station 17.
  • a positional fixation of the mats 2 to each other can take place by means of textile technology.
  • the preform 6 is subsequently heated in an infrared continuous furnace 8 above the melting temperature of the thermoplastic matrix of the preform 6.
  • the heating can also take place within a convection continuous furnace or in the injection molding tool 10 itself.
  • a further robot station 9 the introduction of the three-dimensional preform 6 into the cavity of an injection mold 10 for final molding of the molded part takes place, wherein the flowable thermoplastic material, which is to be injected into the remaining filling space of the cavity, from an injection unit 15 is supplied.
  • the finished molded part 1 is also removed by means of the robot station 9 from the injection molding tool 10 and fed to a storage unit 16.
  • FIGS. 2 and 3 each show a schematic representation of an embodiment of an injection molding tool 10 according to the inventive method.
  • the injection molding tool 10 has a first fixed tool part 18 and a second tool part 20, which form a cavity 22 for the final molding of the molded part 1, in which a very schematically illustrated preform 6 is introduced.
  • the first tool part 18 has a first injection channel 24 and the second tool part 20 has a second injection channel 26, which are provided for injecting flowable thermoplastic material 28 into the cavity 22. From the first and the second injection channel 24, 26 extend perpendicularly each two branch channels, each opening into the cavity 22.
  • the second tool part 20 is movable for introducing the preform 6 into the cavity 22 relative to the first tool part 18 (not illustrated here) and has an injection device 30 in the form of a longitudinally movable plunger and a metering chamber 32 which can be filled with flowable thermoplastic material 28, wherein the second injection channel 26 opens into the metering chamber 32.
  • the injection molding tool 10 also has a feed line 34, which connects the first injection channel 24 in a fluid-conducting manner with the metering chamber 32.
  • the feed line 34 has two line valves 36 which, in the open state, make it possible for flowable thermoplastic material material 28 to flow into the metering space 32, which is supplied from the injection unit 24 provided in the surroundings of the injection molding tool 10 via the first injection channel 24.
  • the first injection channel 24 has a channel valve 40 which, in the closed state, allows diversion into the feed line 34 if the two line valves 36 are open ,
  • the second injection channel 26 has a channel valve 40, which avoids leakage of the thermoplastic material 28 during its introduction into the metering chamber 32 in the closed state and which for injecting the introduced into the metering chamber 32 plastic material 28 in the after insertion of the preform 6 remaining Filling space 42 is opened.
  • 2 illustrates a situation according to step G of the method according to the invention, in which the flowable thermoplastic material 28 is introduced into the metering chamber 32, for which purpose the two line valves 36 are opened beforehand and the two channel valves 40 are closed beforehand.
  • step H of the method according to the invention illustrates a situation according to step H of the method according to the invention, in which the final molding of the molded part 1 flowable thermoplastic material 28 from the injection unit 38 into the filling space 42 of the cavity 22 and additionally in the dosing 32 located thermoplastic flowable Kunststoffmate- material 28 is injected into the filling space 42 by activating the injection device 30, wherein the feed line 34 is closed by closing the line valves 36 before the flowable thermoplastic material 28 is injected into the filling space 42.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

L'invention concerne un procédé de fabrication d'une pièce moulée (1) renforcée de fibres continues, à l'aide d'un outil de moulage par injection (10), l'outil de moulage par injection (10) présentant une première et une seconde partie d'outil (18,20), qui forment une cavité (22) pour la mise en forme définitive de la pièce moulée (1), la première partie d'outil (18) présentant un premier canal d'injection (24) et la seconde partie d'outil (20) présentant un second canal d'injection (26), ces canaux étant prévus pour l'injection d'une matière synthétique thermoplastique coulante (28) dans la cavité (22), la seconde partie d'outil (20) présentant un dispositif d'injection (30) et une chambre de dosage (32) qui peut être remplie de matière synthétique thermoplastique coulante (28), le second canal d'injection (26) débouchant dans la chambre de dosage (32), et le dispositif d'injection (30) étant agencé pour injecter dans la cavité (22) de la matière synthétique thermoplastique coulante (28) se trouvant dans la chambre de dosage (32), par l'intermédiaire du second canal d'injection (26), et le procédé comprenant les étapes A à I.
EP11711458A 2010-03-31 2011-03-23 Procédé de fabrication d'une pièce moulée renforcée de fibres continues comportant l'utilisation d'un outil de moulage par injection Withdrawn EP2552663A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010013541A DE102010013541A1 (de) 2010-03-31 2010-03-31 Verfahren zur Herstellung eines endlosfaserverstärkten Formteils unter Verwendung eines Spritzgusswerkzeug
PCT/EP2011/001433 WO2011120650A1 (fr) 2010-03-31 2011-03-23 Procédé de fabrication d'une pièce moulée renforcée de fibres continues comportant l'utilisation d'un outil de moulage par injection

Publications (1)

Publication Number Publication Date
EP2552663A1 true EP2552663A1 (fr) 2013-02-06

Family

ID=44121480

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11711458A Withdrawn EP2552663A1 (fr) 2010-03-31 2011-03-23 Procédé de fabrication d'une pièce moulée renforcée de fibres continues comportant l'utilisation d'un outil de moulage par injection

Country Status (3)

Country Link
EP (1) EP2552663A1 (fr)
DE (1) DE102010013541A1 (fr)
WO (1) WO2011120650A1 (fr)

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DE102011111233A1 (de) * 2011-08-20 2013-02-21 GM Global Technology Operations LLC (n. d. Gesetzen des Staates Delaware) Verfahren zur Herstellung eines Leichtbauteils, insbesondere einer Karosserieverstärkung für ein Kraftfahrzeug, wie einen Personenkraftwagen
CA2850855C (fr) * 2011-10-11 2018-05-01 Borealis Ag Systeme de distribution pour moulage par injection
DE102012103197A1 (de) * 2012-04-13 2013-10-17 Rehau Ag + Co. Vorrichtung und System zum Halten und Erwärmen eines Vorformlings und Verfahren zum Erwärmen eines Vorformlings
US9010839B2 (en) 2012-10-24 2015-04-21 Sabic Global Technologies B.V. Vehicle side door structure and method of making and using the same
DE102015003206B4 (de) 2015-03-13 2020-03-26 Audi Ag Verfahren und Anlage zum Herstellen eines Fertigteils
DE102016124044A1 (de) * 2016-12-12 2018-06-14 Elringklinger Ag Verfahren zum Herstellen eines Bauteils aus einem endlosfaserverstärkten thermoplastischen Faserverbundkunststoff (TFVK) und Flachfeder hergestellt mit diesem Verfahren

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Also Published As

Publication number Publication date
WO2011120650A1 (fr) 2011-10-06
DE102010013541A1 (de) 2011-10-06

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