EP1519821A1 - Method and device for the injection moulding of multi-component fibre-reinforced moulded parts - Google Patents

Method and device for the injection moulding of multi-component fibre-reinforced moulded parts

Info

Publication number
EP1519821A1
EP1519821A1 EP03735577A EP03735577A EP1519821A1 EP 1519821 A1 EP1519821 A1 EP 1519821A1 EP 03735577 A EP03735577 A EP 03735577A EP 03735577 A EP03735577 A EP 03735577A EP 1519821 A1 EP1519821 A1 EP 1519821A1
Authority
EP
European Patent Office
Prior art keywords
preform
injection molding
component
plastic
work area
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Withdrawn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
EP03735577A
Other languages
German (de)
French (fr)
Inventor
Erwin BÜRKLE
Christoph Lange
Heinz-Wolfgang Rasinger
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.)
KraussMaffei Technologies GmbH
Original Assignee
Krauss Maffei Kunststofftechnik GmbH
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 Krauss Maffei Kunststofftechnik GmbH filed Critical Krauss Maffei Kunststofftechnik GmbH
Publication of EP1519821A1 publication Critical patent/EP1519821A1/en
Withdrawn legal-status Critical Current

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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
    • B29C45/03—Injection moulding apparatus
    • B29C45/04—Injection moulding apparatus using movable moulds or mould halves
    • B29C45/0441—Injection moulding apparatus using movable moulds or mould halves involving a rotational movement
    • B29C45/045—Injection moulding apparatus using movable moulds or mould halves involving a rotational movement mounted on the circumference of a rotating support having a rotating axis perpendicular to the mould opening, closing or clamping direction
    • 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
    • B29C45/0013—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor using fillers dispersed in the moulding material, e.g. metal particles
    • 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
    • B29C45/16—Making multilayered or multicoloured 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
    • B29C45/17—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
    • B29C45/54—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston and plasticising screw
    • 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
    • B29C2045/1692—Making multilayered or multicoloured articles one layer comprising fibres
    • 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
    • B29C2045/466—Means for plasticising or homogenising the moulding material or forcing it into the mould supplying the injection unit directly by a compounder
    • 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
    • B29C45/14008—Inserting articles into the mould
    • B29C45/14016—Intermittently feeding endless articles, e.g. transfer films, to the mould
    • 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
    • B29C45/1418—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 inserts being deformed or preformed, e.g. by the injection pressure
    • 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
    • B29C45/1615—The materials being injected at different moulding stations
    • B29C45/1628—The materials being injected at different moulding stations using a mould carrier rotatable about an axis perpendicular to the opening and closing axis of the moulding stations

Definitions

  • the invention relates to a method and a device for producing multi-component molded plastic parts.
  • Multi-component molded plastic parts are, for example, oil pans with a circumferential seal for automobiles, housing covers with circumferential seals, structural components with damping elements, melamine-colored components, etc. or structural components with a core or a layer made of fiber material such as glass fibers or synthetic fibers and a molded or overmolded plastic body.
  • thermoplastic part with an injected elastomer seal
  • a two-stroke injection molding process In a first cycle, a thermoplastic base body is produced in a mold with retractable cores. In a second cycle, the cores are withdrawn and elastomer material is injected into the resulting cavity.
  • indexable insert machines are known in which an indexable insert is rotatably arranged on a turntable between a movable and a fixed platen.
  • the indexable insert carries a tool half on each side, which interact with a tool half on the fixed platen or on the movable platen.
  • an injection unit is assigned to each of the fixed platen or movable platen.
  • In-mold compounders are known per se (DE-PS-114 22 29). They include an extruder, in which plastic material is plasticized, and an injection cylinder, in which the plasticized plastic material is fed, possibly with the interposition of a pressure accumulator, and then injected from the injection cylinder into a mold.
  • a multi-phase plastic mass is produced in the extruder, for example by adding glass fiber material, carbon fiber material, mixing systems or fillers for the production of highly filled molding materials.
  • This material is used as a component in the injection molding process for the production of multi-component plastic parts.
  • Other materials can also be prepared and injected using an in-mold compounder or another known injection molding unit.
  • Elastomers in the form of crosslinking plastics, rubber or LSR or thermoplastic elastomers are suitable as a further component.
  • a preliminary product made of fiber material is formed into a preform in the first work area, and at the same time a preform is subjected to an injection molding process in the second work area, ie plastic material is injection molded onto the preform or the preform is overmolded with plastic material.
  • the finished plastic molded part is then removed from the second work area, and the preform produced in the first work area is transported to the second work area via the indexable insert.
  • woven or nonwoven materials made of glass, natural, carbon or synthetic fibers, preferably in the form of an endless belt; the plastic material is preferably a thermoplastic.
  • indexable insert machines are particularly suitable for use with two injection units.
  • Such a structure can also be used according to the invention in order to inject an additive into the second working area when the preform is formed.
  • This additive can be, for example, a hardener to harden synthetic fibers, a binder to prevent the preform from expanding when the mold is opened, a plastic material or an additive that improves the adhesion of the fiber material to the plastic to be injected later.
  • the figure shows an injection molding machine with a fixed platen 2, a movable platen 4 and a turning plate 6.
  • the mold platen carry Molding tools 3, 5, which together with the insert 6 form cavities for the production of plastic molded parts.
  • the indexable insert 6 and the movable platen 4 are axially displaceable, the movable platen 4 being moved toward or away from the fixed platen 2 via spars 8 which are guided through the fixed platen.
  • a drive 10 and (schematically) a first injection unit I and a second injection unit II.
  • the entire structure comprising the drive and the platen is mounted on a module frame 20, which in turn is attached to a machine bed 35 of the injection molding machine.
  • a first work area A is formed between the movable platen 4 and the insert 6 and a second work area B is formed between the insert 6 and the fixed platen 2.
  • a fiber material is introduced into the mold cavity of the first working area A, preferably in the form of an endless belt, as indicated by the arrow P.
  • the molds are then closed by moving the movable platen 4 and the turning plate 6 towards the fixed platen, and a preform is formed in the first work area, while at the same time a preform with plastic that has already been produced is made in the cavity of the second work area B by means of the second injection unit II is encapsulated.
  • the injection unit I shown in the figure is optional and, if necessary, can be used to inject an additive into the cavity of the first working area A when the preform is formed.
  • injection screw devices are shown as injection units; instead or in combination with it, in-mold compounders can also be used.

Landscapes

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

Abstract

To produce multi-component moulded plastic parts by injection moulding, at least one component is manufactured using a compounding method in the mould. According to the invention, a reversing plate machine with two working regions (A, B) is used to produce multi-component parts comprising cores or layers of fibrous tissue or nonwoven material. The fibrous material is shaped into a preform in a mould cavity in the working area A and a preform that has been produced in a previous cycle is simultaneously encapsulated in or injected with plastic in working region B. The reversing plate (6) is then rotated about its axis, transporting the preform from working region A into working region B, the finished moulded plastic part is removed and the production cycle is repeated from the beginning. The device is optionally provided with a second injection moulding unit (I), which is used if necessary to inject an additive such as a curing agent, binding agent or similar into the cavity during the shaping of the preform.

Description

VERFAHREN UND VORRICHTUNG ZUM SPRITZGIESSEN MEHRKOMPONENTIGER, FASERVERSTÄRKTER FORMTEILE METHOD AND DEVICE FOR INJECTION MOLDING MULTI-COMPONENT, FIBER-REINFORCED MOLDED PARTS
Die Erfindung bezieht sich auf ein Verfahren und eine Vorrichtung zum Herstellen mehr- komponentiger Kunststoff-Formteile.The invention relates to a method and a device for producing multi-component molded plastic parts.
Mehrkomponentige Kunststoff-Formteile sind beispielsweise Ölwannen mit umlaufender Dichtung für Automobile, Gehäusedeckel mit umlaufender Dichtung, Strukturbauteile mit Dämpfelementen, Melirfarbenbauteile etc. oder auch Strukturbauteile mit einem Kern oder einer Lage aus Fasermaterial wie Glasfasern oder Synthetikfasern und einem an- oder umspritzten Kunststoffkörper.Multi-component molded plastic parts are, for example, oil pans with a circumferential seal for automobiles, housing covers with circumferential seals, structural components with damping elements, melamine-colored components, etc. or structural components with a core or a layer made of fiber material such as glass fibers or synthetic fibers and a molded or overmolded plastic body.
Aus der DE-A-198 48 26 ist es bekannt, ein mehrkomponentiges Kunststoff-Formteil, in diesem Fall ein Thermoplastteil mit einer eingespritzten Elastomerdichtung, in einem zweitaktigen Spritzgießvorgang herzustellen. Dazu wird in einem ersten Takt ein Grundkörper aus Thermoplast in einer Form mit rückziehbaren Kernen hergestellt. In einem zweiten Takt werden die Kerne zurückgezogen, und Elastomermaterial wird in die so entstehende Kavität eingespritzt.From DE-A-198 48 26 it is known to produce a multi-component molded plastic part, in this case a thermoplastic part with an injected elastomer seal, in a two-stroke injection molding process. In a first cycle, a thermoplastic base body is produced in a mold with retractable cores. In a second cycle, the cores are withdrawn and elastomer material is injected into the resulting cavity.
Desweiteren sind sogenannte Wendeplattenmaschinen bekannt, bei denen zwischen einer beweglichen und einer festen Formaufspannplatte eine Wendeplatte auf einem Drehteller verdrehbar angeordnet ist. Die Wendeplatte trägt auf jeder Seite eine Werkzeughälfte, die mit einer Werkzeughälfte auf der festen Formaufspannplatte bzw. auf der beweglichen Formaufspaimplatte zusammenwirken. Desweiteren ist der festen Formaufspannplatte bzw. beweglichen Formaufspannplatte je ein Einspritzaggregat zugeordnet. Bei geschlossenem Werkzeug wird in einem ersten Takt von einer ersten Spritzgießmaschine Kunststoffmaterial in die Kavität zwischen der festen Formaufspannplatte und der Wendeplatte einge- spritzt, wodurch ein Spritzrohling hergestellt wird. Anschließend wird das Werkzeug geöffnet, die Wendeplatte wird um 180° verdreht, wobei der Rohling zur beweglichen Formaufspannplatte transportiert wird. Anschließend wird das Werkzeug wieder geschlossen, und Kunststoffmaterial von einer zweiten Spritzgießmaschine wird in die Kavität zwischen beweglicher Aufspannplatte und Wendeplatte mit dem darin befindlichen Rohling eingespritzt; gleichzeitig läuft ein weiterer erster Takt ab. Eine derartige Wendeplattenmaschine ist aus der WO 01/10624 AI bekannt.Furthermore, so-called indexable insert machines are known in which an indexable insert is rotatably arranged on a turntable between a movable and a fixed platen. The indexable insert carries a tool half on each side, which interact with a tool half on the fixed platen or on the movable platen. Furthermore, an injection unit is assigned to each of the fixed platen or movable platen. When the mold is closed, plastic material is inserted into the cavity between the fixed platen and the insert in a first cycle by a first injection molding machine. sprayed, whereby a spray blank is produced. Then the tool is opened, the insert is rotated by 180 °, whereby the blank is transported to the movable platen. The tool is then closed again and plastic material from a second injection molding machine is injected into the cavity between the movable platen and the insert with the blank therein; at the same time, another first bar runs. Such an insert machine is known from WO 01/10624 AI.
Bei den oben beschriebenen Verfahren werden stets nur einphasige, d.h. "reine" Kunststoffe verwendet. Aus Stabilitäts- oder Kostengründen besteht jedoch der Bedarf, Kohle- oder glasfaserverstärkte Kunststoffe oder Kunststoffe mit anderen Füllmaterialien zu verwenden.In the methods described above, only single-phase, i.e. "pure" plastics are used. For stability or cost reasons, however, there is a need to use carbon or glass fiber reinforced plastics or plastics with other fillers.
Dazu wird erfindungsgemäß vorgeschlagen, zur Herstellung mindestens einer Komponente eines mehrkomponentigen Kunststoff-Formteils einen In-Mould-Compounder zu verwenden.For this purpose, it is proposed according to the invention to use an in-mold compounder to produce at least one component of a multi-component plastic molded part.
In-Mould-Compounder an sich sind bekannt (DE-PS-114 22 29). Sie umfassen einen Extruder, in dem Kunststoffmaterial plastifiziert wird, und einen Einspritzzylinder, in dem das plastifizierte Kunststoffmaterial, ggf. unter Zwischenschaltung eines Druckspeichers, eingespeist wird und anschließend aus dem Einspritzzylinder in eine Form eingespritzt wird.In-mold compounders are known per se (DE-PS-114 22 29). They include an extruder, in which plastic material is plasticized, and an injection cylinder, in which the plasticized plastic material is fed, possibly with the interposition of a pressure accumulator, and then injected from the injection cylinder into a mold.
Erfindungsgemäß wird in dem Extruder eine mehrphasige Kunststoffmasse hergestellt, beispielsweise durch Zugabe von Glasfasermaterial, Kohlefasermaterial, Mischsystemen oder Füllstoffen zur Herstellung hochgefüllter Formmassen. Zur Herstellung von mehrkomponentigen Kunststoffteilen wird dieses Material als eine Komponente im Spritzgießvorgang verwendet. Andere Materialien können ebenfalls über einen In-Mould-Compounder vorbereitet und eingespritzt werden oder über eine andere bekannte Spritzgießeinheit. Als weitere Komponente eignen sich beispielsweise Elastomere in Form von vernetzenden Kunststoffen, Gummi oder LSR oder thermoplastische Elastomere. Erfindungsgemäß wird weiterhin vorgeschlagen, zur Herstellung von Kunststoff- Formteilen mit einem Kern oder Lagen aus Fasermaterial eine Spritzgießmaschine mit zwei Arbeitsbereichen, vorzugsweise in Form einer Wendeplatte, zu verwenden. Dabei wird in dem ersten Arbeitsbereich ein Vorprodukt aus Fasermaterial zu einem Vörformling umgeformt, und gleichzeitig wird im zweiten Arbeitsbereich ein Vörformling einem Spritzgießvorgang unterzogen, d.h. Kunststoffmaterial wird an den Vörformling angespritzt oder der Vörformling wird mit Kunststoffmaterial umspritzt. Anschließend wird das fertige Kunststoff-Formteil aus dem zweiten Arbeitsbereich entnommen, und der im ersten Arbeitsbereich gefertigte Vörformling wird über die Wendeplatte in den zweiten Arbeitsbereich transportiert.According to the invention, a multi-phase plastic mass is produced in the extruder, for example by adding glass fiber material, carbon fiber material, mixing systems or fillers for the production of highly filled molding materials. This material is used as a component in the injection molding process for the production of multi-component plastic parts. Other materials can also be prepared and injected using an in-mold compounder or another known injection molding unit. Elastomers in the form of crosslinking plastics, rubber or LSR or thermoplastic elastomers are suitable as a further component. According to the invention, it is further proposed to use an injection molding machine with two working areas, preferably in the form of an indexable insert, for the production of plastic molded parts with a core or layers of fiber material. A preliminary product made of fiber material is formed into a preform in the first work area, and at the same time a preform is subjected to an injection molding process in the second work area, ie plastic material is injection molded onto the preform or the preform is overmolded with plastic material. The finished plastic molded part is then removed from the second work area, and the preform produced in the first work area is transported to the second work area via the indexable insert.
Auf diese Weise sind in einer Maschine das Umformen des Vorproduktes und das Fertigen des Endproduktes integriert, und Strukturbauteile, die höchsten mechanischen Ansprüchen genügen, können hergestellt werden.In this way, the forming of the preliminary product and the manufacture of the end product are integrated in one machine, and structural components that meet the highest mechanical demands can be produced.
Als Vorprodukte eignen sich insbesondere Gewebe- oder Vliesmaterialien aus Glas-, Natur-, Kohle- oder Synthetikfasern, vorzugsweise in Form eines Endlosbandes; das Kunststoffmaterial ist vorzugsweise ein Thermoplast.Particularly suitable as preliminary products are woven or nonwoven materials made of glass, natural, carbon or synthetic fibers, preferably in the form of an endless belt; the plastic material is preferably a thermoplastic.
Konventionelle Wendeplattenmaschinen sind insbesondere für den Einsatz mit zwei Einspritzaggregaten geeignet. Ein derartiger Aufbau kann auch erfindungsgemäß eingesetzt werden, um beim Bilden des Vorformlings ein Additiv in den zweiten Arbeitsbereich einzuspritzen. Dieses Additiv kann beispielsweise ein Härter sein, um Synthetikfasern auszuhärten, ein Binder, um ein Aufweiten des Vorformlings beim Öffnen der Form zu verhindern, ein Kunststoffmaterial oder ein Zusatzstoff sein, der die Haftung des Fasermaterials mit dem später einzuspritzenden Kunststoff verbessert.Conventional indexable insert machines are particularly suitable for use with two injection units. Such a structure can also be used according to the invention in order to inject an additive into the second working area when the preform is formed. This additive can be, for example, a hardener to harden synthetic fibers, a binder to prevent the preform from expanding when the mold is opened, a plastic material or an additive that improves the adhesion of the fiber material to the plastic to be injected later.
Eine Ausführungsform der Erfindung wird anhand der beigefügten Zeichnung erläutert.An embodiment of the invention is explained with reference to the accompanying drawing.
Die Figur zeigt eine Spritzgießmaschine mit einer festen Formaufspannplatte 2, einer beweglichen Formaufspannplatte 4 und einer Wendeplatte 6. Die Formaufspannplatten tragen Formwerkzeuge 3, 5, die zusammen mit der Wendeplatte 6 Kavitäten zum Herstellen von Kunststoff-Formteilen bilden. Die Wendeplatte 6 und die bewegliche Formaufspannplatte 4 sind axial verschieblich, wobei die bewegliche Formaufspannplatte 4 über Holme 8, die durch die feste Formaufspannplatte geführt sind, auf die feste Formaufspannplatte 2 zu- oder von ihr wegbewegt wird. Weiterhin dargestellt sind ein Antrieb 10 sowie (schematisch) ein erstes Einspritzaggregat I und ein zweites Einspritzaggregat II.The figure shows an injection molding machine with a fixed platen 2, a movable platen 4 and a turning plate 6. The mold platen carry Molding tools 3, 5, which together with the insert 6 form cavities for the production of plastic molded parts. The indexable insert 6 and the movable platen 4 are axially displaceable, the movable platen 4 being moved toward or away from the fixed platen 2 via spars 8 which are guided through the fixed platen. Also shown are a drive 10 and (schematically) a first injection unit I and a second injection unit II.
Der gesamte Aufbau aus Antrieb und Formaufspannplatten ist auf einem Modulrahmen 20 gelagert, der seinerseits auf einem Maschinenbett 35 der Spritzgießmaschine befestigt ist.The entire structure comprising the drive and the platen is mounted on a module frame 20, which in turn is attached to a machine bed 35 of the injection molding machine.
Bei dem dargestellten Aufbau sind zwischen der beweglichen Formaufspannplatte 4 und der Wendeplatte 6 ein erster Arbeitsbereich A und zwischen der Wendeplatte 6 und der festen Formaufspannplatte 2 ein zweiter Arbeitsbereich B gebildet. Bei geöffneten Formwerkzeugen wird ein Fasermaterial in die Formkavität des ersten Arbeitsbereichs A vorzugsweise in Form eines Endlosbandes eingebracht, wie durch den Pfeil P angedeutet ist. Anschließend werden die Formwerkzeuge durch Bewegen der beweglichen Formaufspannplatte 4 und der Wendeplatte 6 auf die feste Formaufspannplatte zu geschlossen, und im ersten Arbeitsbereich wird ein Vörformling gebildet, während gleichzeitig in der Kavität des zweiten Arbeitsbereichs B ein bereits gefertigter Vörformling mit Kunststoff mittels des zweiten Einspritzaggregats II umspritzt wird.In the structure shown, a first work area A is formed between the movable platen 4 and the insert 6 and a second work area B is formed between the insert 6 and the fixed platen 2. When the molds are open, a fiber material is introduced into the mold cavity of the first working area A, preferably in the form of an endless belt, as indicated by the arrow P. The molds are then closed by moving the movable platen 4 and the turning plate 6 towards the fixed platen, and a preform is formed in the first work area, while at the same time a preform with plastic that has already been produced is made in the cavity of the second work area B by means of the second injection unit II is encapsulated.
Anschließend werden die Formwerkzeuge wieder geöffnet, das fertige Kunststoffteil wird aus dem Arbeitsbereich B entfernt, und durch Drehen der Wendeplatte wird der gefertigte Vörformling in den Arbeitsbereich B transportiert, und ein weiterer Abschnitt des Fasermaterials wird in den Bereich A gefördert, so daß ein weiterer Maschinentakt beginnen kann. Das in der Figur dargestellte Einspritzaggregat I ist optional und kann bei Bedarf dazu verwendet werden, beim Bilden des Vorformlings ein Additiv in die Kavität des ersten Arbeitsbereiches A einzuspritzen.Then the molds are opened again, the finished plastic part is removed from work area B, and by turning the insert, the preform is transported to work area B, and a further section of the fiber material is conveyed to area A, so that another machine cycle can start. The injection unit I shown in the figure is optional and, if necessary, can be used to inject an additive into the cavity of the first working area A when the preform is formed.
In der Figur sind als Einspritzaggregate Einspritzschnecken- Vorrichtungen dargestellt; statt dessen oder in Kombination damit können auch In-Mould-Compounder verwendet werden. In the figure, injection screw devices are shown as injection units; instead or in combination with it, in-mold compounders can also be used.

Claims

Patentansprüche claims
1. Verfahren zum Herstellen eines mehrkomponentigen Kunststoff-Formteils in einem mehrstufigen Spritzgießvorgang, wobei man zur Herstellung mindestens einer Komponente Kunststoffmaterial in einem Extruder mit Zuschlagstoffen aufbereitet und über eine Einspritzeinheit in eine Form einspritzt.1. A process for producing a multi-component plastic molded part in a multi-stage injection molding process, wherein for the production of at least one component, plastic material is processed with additives in an extruder and injected into a mold via an injection unit.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, daß die Zuschlagstoffe Glasfasern oder -kugeln, Kohlefaser und/oder Füllstoffe sind.2. The method according to claim 1, characterized in that the additives are glass fibers or balls, carbon fiber and / or fillers.
3. Vorrichtung zum Herstellen mehrkomponentiger Kunststoff-Formteile mit mindestens einem Formwerkzeug, und einer Formwechseleinrichtung und mehreren Spritzgießeinheiten, dadurch gekennzeichnet, daß mindestens eine der Spritzgießeinheiten ein Extruder mit einem Einspritzzylinder ist.3. Device for producing multi-component molded plastic parts with at least one mold, and a mold changing device and several injection molding units, characterized in that at least one of the injection molding units is an extruder with an injection cylinder.
4. Vorrichtung nach Anspruch 3 , dadurch gekennzeichnet, daß die Formwechseleinrichtung bewegbare Kerne einer Form aufweist.4. The device according to claim 3, characterized in that the shape changing device has movable cores of a shape.
5. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß die Formwechseleinrichtung eine Wendeplatte ist.5. The device according to claim 3, characterized in that the shape changing device is an indexable insert.
6. Verfahren zum Herstellen eines mehrkomponentigen Kunststoff-Formteils auf einer Spritzgießmaschine mit zwei Arbeitsbereichen, vorzugsweise in Form einer Wendeplatte, wobei man taktweise ein Vorprodukt aus Fasermaterial in den ersten Arbeitsbereich einbringt und zu einem Vörformling umformt und gleichzeitig in dem zweiten Arbeitsbereich einen Vörformling, der in einem vorhergehenden Takt ausgebildet wurde, in einem Spritzgießvorgang weiterverarbeitet.6.Method for producing a multi-component plastic molded part on an injection molding machine with two work areas, preferably in the form of an indexable insert, in which a preliminary product made of fiber material is introduced into the first work area and formed into a preform and at the same time a preform in the second work area was formed in a previous cycle, processed in an injection molding process.
7. Verfahren nach Anspruch 6, wobei man in den Spritzgießvorgang im zweiten Arbeitsbereich Kunststoffmaterial an den Vörformling anspritzt oder ihn damit umspritzt. 7. The method according to claim 6, wherein in the injection molding process in the second work area, plastic material is injected onto the preform or molded around it.
8. Verfahren nach Anspruch 6 oder 7, wobei man bei der Bildung des Vorformlings ein Additiv wie Härter, Binder, Kunststoffmaterial, haftungsverbessemde Zusätze oder dergleichen in den ersten Arbeitsbereich in einem Spritzgießvorgang einspritzt.8. The method according to claim 6 or 7, wherein in the formation of the preform, an additive such as hardener, binder, plastic material, adhesion-improving additives or the like is injected into the first working area in an injection molding process.
9. Verfahren nach einem der Ansprüche 6-8, das Vorprodukt ein Fasergewebe oder ein Faservlies aufweist und die Fasern vorzugsweise Glas-, Kohle-, Natur- oder Synthetikfasern sind.9. The method according to any one of claims 6-8, the intermediate product comprises a fiber fabric or a nonwoven fabric and the fibers are preferably glass, carbon, natural or synthetic fibers.
10. Verfahren nach einem der Ansprüche 6 - 9, wobei das Vorprodukt dem ersten Arbeitsbereich als Bahnmaterial, vorzugsweise als Endlosbahn zugeführt wird. 10. The method according to any one of claims 6-9, wherein the preliminary product is fed to the first work area as web material, preferably as an endless web.
EP03735577A 2002-06-21 2003-06-07 Method and device for the injection moulding of multi-component fibre-reinforced moulded parts Withdrawn EP1519821A1 (en)

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DE2002127636 DE10227636A1 (en) 2002-06-21 2002-06-21 Method and device for producing multi-component molded plastic parts
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PCT/EP2003/006004 WO2004000525A1 (en) 2002-06-21 2003-06-07 Method and device for the injection moulding of multi-component fibre-reinforced moulded parts

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