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WO1998023431A1 - Method and device for producing a multilayer plastic element - Google Patents

Method and device for producing a multilayer plastic element Download PDF

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Publication number
WO1998023431A1
WO1998023431A1 PCT/DE1997/002824 DE9702824W WO9823431A1 WO 1998023431 A1 WO1998023431 A1 WO 1998023431A1 DE 9702824 W DE9702824 W DE 9702824W WO 9823431 A1 WO9823431 A1 WO 9823431A1
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WO
WIPO (PCT)
Prior art keywords
injection molding
plastic part
plastic
component
tool
Prior art date
Application number
PCT/DE1997/002824
Other languages
German (de)
French (fr)
Inventor
Norbert VÄTH
Egbert Forstmeyer
Original Assignee
Petri Ag
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 Petri Ag filed Critical Petri Ag
Priority to BR9713550-0A priority Critical patent/BR9713550A/en
Priority to JP10524159A priority patent/JP2000516168A/en
Priority to EP97952702A priority patent/EP0946347A1/en
Publication of WO1998023431A1 publication Critical patent/WO1998023431A1/en

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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
    • B29C45/1676—Making multilayered or multicoloured articles using a soft material and a rigid material, e.g. making articles with a sealing part
    • 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
    • B29C45/06—Injection moulding apparatus using movable moulds or mould halves mounted on a turntable, i.e. on a rotating support having a rotating axis parallel to the mould opening, closing or clamping direction
    • B29C45/062—Injection moulding apparatus using movable moulds or mould halves mounted on a turntable, i.e. on a rotating support having a rotating axis parallel to the mould opening, closing or clamping direction carrying mould halves co-operating with fixed mould halves
    • 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
    • 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
    • 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
    • B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
    • B29C67/24—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 characterised by the choice of material
    • B29C67/246—Moulding high reactive monomers or prepolymers, e.g. by reaction injection moulding [RIM], liquid injection moulding [LIM]
    • 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
    • B29C2045/1689—Making multilayered or multicoloured articles injecting layers having identical injection cycle times
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2075/00—Use of PU, i.e. polyureas or polyurethanes or derivatives thereof, as moulding material

Definitions

  • the invention relates to a method for producing a multilayer plastic part according to the preamble of claim 1 and an apparatus for performing the method.
  • Multi-component plastic technology for producing a plastic part from different materials.
  • the part is first manufactured in its basic structure by introducing a component, which ensures the necessary rigidity and strength of the component. Then a part of the tool is changed so that a cavity is present in the tool on one side of the component, into which the further components can be introduced, which give the part a required surface quality.
  • the invention is therefore based on the object of simplifying the production of a composite part made of plastic and 2-component thermoset. According to the invention this is achieved according to the features of claims 1, 4 and 5.
  • the plastic part and the layer of two-component thermoset are successively injection-molded in the same mold in a cycle-synchronized manner.
  • the plastic body is preferably first injected, and after changing the tool to produce a cavity in the tool corresponding to the thickness of the layer of the 2-component thermoset, the 2-component thermoset is introduced.
  • the cycle synchronization is preferably achieved by adapting the reaction time of the 2-component thermoset to the time for the injection molding of the plastic part. As a rule, a shorter time is required for the injection molding of a plastic part than for the production of a part from two-component thermosetting plastic, so that its reaction time must be shortened.
  • the method is preferably intended for applying a layer of polyurethane to a plastic part.
  • a device for producing a multi-layer plastic part using an injection molding machine is characterized according to the invention in that a RIM device is provided in the injection molding machine for introducing a 2-component thermoset into a multi-component injection molding tool.
  • This device represents a special device for performing the method.
  • the process can also be carried out using a plastic injection molding machine and a RIM system, i.e. Can be carried out with two separate machines that are commercially available. The production takes place in two tools that are linked together.
  • a movable device is provided with at least two injection molding tools, with an injection molding tool of at least one injection nozzle of the injection molding machine and a second injection molding tool of at least one mixing nozzle of the RIM system or the RIM device in the working position Injection molding machine is assigned.
  • the movable device is preferably designed as a rotatable device. If two identical tools are arranged, each tool is alternately connected to the spray nozzle and the mixing nozzle.
  • a handling device and a common control system are expediently provided for linking the injection molding machine and the RIM system.
  • the multi-component cavities of the injection molding machine and the RIM system can be assigned with the handling device.
  • the injection molds have the same mold halves, to which matrices of different depths are assigned on the spray nozzle and on the mixing nozzle, with a space with the dimensions of the plastic part being present between the mold nozzle assigned to the spray nozzle and the respective mold half
  • a free space with the dimensions of the plastic part provided with a foam layer is provided between the die assigned to the mixing nozzle and the respective tool half.
  • the multi-component injection molding tool is preferably made of metal. It is furthermore expedient for the multi-component injection molding tool to have a hidden parting plane in order to avoid burr formation on the visible surface of the parts produced.
  • Figure 1 is a schematic representation of two pivotally arranged tools with parts manufactured therein and with an associated spray and mixing nozzle.
  • Fig. 2 shows the device of FIG. 1 before a spray or. Coating process
  • FIG. 3 shows the device according to FIG. 2 after the end of the spraying or coating process
  • 4a, b show a section of a tool with a hidden parting plane in section; 5 shows a schematic illustration of a device with two tools and handling device;
  • Fig. 6 shows the course of the process over time.
  • each tool half has a base plate 1 which carries two identical tool halves 2, 3 and is rotatably mounted about an axis la.
  • Each tool half is provided with an ejector 4 or 5, each of which has two ejector pins 6, 7 and 8, 9.
  • a die 10 of an injection molding machine 11 and a die 12 of a RIM device 13 are provided opposite the tool halves 2, 3.
  • the die 10 is assigned a spray nozzle 14 and the RIM device 13 a mixing nozzle 15.
  • the die 10 assigned to the injection molding machine 11 has such a profile of its surface 16 that when the die 10 is placed on the patrix there is a free space between the two which corresponds to the thickness of a plastic part 17 to be injection molded.
  • the die 12 assigned to the RIM device 13 has such a profile of its surface 18 that when the die 12 is placed on the patrix there is a free space between the two which corresponds to the thickness of the plastic part 17 provided with a foam layer 19.
  • the base plate 1 can be moved relative to the matrices 10, 12.
  • the tools are shown in the open position, in which the injection molded and provided with a layer 19 of 2-component thermosetting plastic part 17 using the ejector pins 6, 7 the tool half 2 can be removed.
  • the plastic part 17 in the mold half 3 remains there.
  • the base plate 1 After removing the part from the tool half 2, the base plate 1 is rotated by 180 °, so that the tool half 3 with the plastic part 17 now faces the die 12 and the empty tool half 2 faces the die 10, as shown in FIG. 2 .
  • the base plate 1 is moved in the direction of the dies in such a way that the tool half 2 rests on the die 10 and the tool half 3 rests on the die 12 and the tools are thus closed.
  • the plastic part 17 can be produced simultaneously by means of the injection nozzle 14 in the injection molding process and in the other tool the plastic part 17 can be provided with a thermoset layer via the nozzle 15, as shown in FIG. 3.
  • FIGS. 4a and b A special embodiment of the tool is shown in FIGS. 4a and b, in which a concealed division is provided.
  • the tool halves 2, 3, on the one hand, and the dies 10, 12, on the other hand have two dividing planes 20, 21 arranged offset from one another.
  • 4a shows the tool half 2 or 3 and the associated die 10 for the production of the plastic part 17.
  • thermoset layer 19 The following tool for applying the thermoset layer 19 to the plastic part 17 using the Die 12 has identical dividing planes 20, 21 offset by dimension a, as shown in FIG. 4b.
  • the outside of the coated part is burr-free.
  • the burr that appears on the edge is less annoying and may not need to be removed.
  • FIGS. 1 to 3 While an injection molding machine with an integrated RIM device is shown in the embodiment of FIGS. 1 to 3, an injection molding machine 22 and a RIM system 23 are provided in the embodiment of FIG. 5, which are commercially available. These are linked together by a handling device 24, which is only shown in principle, the actuating arm of which can be moved and swiveled both transversely and perpendicularly to the machines placed next to one another, and have a common control.
  • the process sequence is shown again in FIG. 6.
  • plastic is injected into the first tool at a pressure of 800-1000 bar for 2.5 seconds at a temperature of 230 ° C. via the spray nozzle 14.
  • a pressure of 400 bar is then applied over a period of 10 seconds. This is followed by a cooling time of 25 seconds.
  • the manufacturing process of the plastic part 17 is thus completed.
  • the cavity is changed by rotating the base plate 1. This process takes about 6 seconds.
  • the second plastic part 17 is then produced synchronously under the aforementioned conditions and the first plastic part 17 is coated with the foam layer 19 made of polyurethane.
  • the coating is carried out in such a way that two high-pressure pumps, not shown liquid components are poured into the mold via the mixing nozzle 15 at a pressure of 170 to 230 bar in a predetermined mixing ratio within 2.5 seconds. After a reaction time of 30 seconds at a mold temperature of 50 to 70 ° C, the entire first plastic part is removed from the tool.
  • the time-synchronously produced second plastic part is then rotated into the area of the die 12 by rotating the base plate 1 for coating with the foam layer 19.
  • the time-synchronous process described is now repeated, as is also shown in FIG. 6.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

The invention relates to a method and device for the production of a multilayer plastic element, in which a plastic injection-moulded part is coated with at least one coating of 2-component thermosetting plastic. In accordance with the invention, the plastic element and the coating of 2-component thermosetting plastic are injection-moulded, successively and cycle-synchronously, in the same mould, whereby the reaction time of the 2-component thermosetting plastic is adapted to the time needed for injection-moulding the plastic element. A device for producing a multilayer plastic element by using an injection moulding machine is characterized in that, in the injection moulding machine (11), there is a RIM device (13) for introducing a 2-component thermosetting plastic into a multi-component injection moulding die. This makes it possible for the production of multilayer plastic elements to take place simultaneously, by using a plurality of moulds. For, while the coating of an earlier produced plastic element takes place in one mould, in a second mould the next plastic element is already being injection-moulded.

Description

Verfahren und Vorrichtung zur Herstellung eines Mehrschicht-Kunststoffteils Method and device for producing a multilayer plastic part
Beschreibungdescription
Die Erfindung betrifft ein Verfahren zur Herstellung eines Mehrschicht-Kunststoffteils nach dem Oberbegriff des Anspruchs 1 und eine Vorrichtung zur Durchführung des Verfahrens .The invention relates to a method for producing a multilayer plastic part according to the preamble of claim 1 and an apparatus for performing the method.
Zur Herstellung eines Kunststoffteils aus unterschiedlichen Werkstoffen ist die Mehrkomponenten-Kunststofftechnik bekannt. Dabei wird mittels einer Mehrkomponenten-Spritz- gießmaschine in einem Mehrkomponenten-Spritzgießwerkzeug das Teil durch Einbringen einer Komponente zunächst in seinem Grundaufbau hergestellt, der die notwendige Steifig- keit und Festigkeit des Bauteils sicherstellt. Anschließend wird ein Teil des Werkzeugs so verändert, daß im Werkzeug auf einer Seite des Bauteils ein Hohlraum vorhanden ist, in den die weiteren Komponenten eingebracht werden können, die dem Teil eine geforderte Oberflächenqualität verleihen. (Konstruktion 30 (1978) H.10, S. 395 - 401)Multi-component plastic technology is known for producing a plastic part from different materials. Using a multi-component injection molding machine in a multi-component injection molding tool, the part is first manufactured in its basic structure by introducing a component, which ensures the necessary rigidity and strength of the component. Then a part of the tool is changed so that a cavity is present in the tool on one side of the component, into which the further components can be introduced, which give the part a required surface quality. (Construction 30 (1978) H.10, pp. 395 - 401)
Mit den Kunststoffen, die mit diesen Mehrkomponenten-Spritz- gießmaschinen verarbeitet werden können, lassen sich jedoch keine Oberflächen erzielen, wie sie für manche Anwendungen, z.B. in Automobilen, gefordert werden. Dort soll der Oberflächen-Werkstoff eine gute Habtik und Kratzfestigkeit aufweisen, wie sie mit Kunststoffen, die in bekannten Mehrkomponenten-Spritzgießmaschinen verarbeitbar sind, nur bedingt zu erzielen sind. Weiterhin werden nicht die dort geforderte Lichtechtheit und Kälteschlagzähigkeit erreicht. Zur Erfüllung dieser Forderungen ist deshalb im Automobil - bau bekannt, Kunststoffteile mit 2 -Komponenten-Duroplast zu beschichten. Hierzu wird ein Kunststoffteil zunächst in einem entsprechenden Werkzeug mittels einer Spritzgußmaschine hergestellt. Danach wird es aus dem Werkzeug entnommen und in ein zweites Werkzeug eingelegt, in dem mittels einer RIM-Anlage eine 2 -Komponenten-Duroplastschicht , z. B. aus Polyurethan (PU-Schicht) aufgebracht wird.However, with the plastics that can be processed with these multi-component injection molding machines, it is not possible to achieve surfaces that are required for some applications, for example in automobiles. There, the surface material should have good properties and scratch resistance, such as can only be achieved to a limited extent with plastics that can be processed in known multi-component injection molding machines. Furthermore, the light fastness and low-temperature toughness required there are not achieved. To meet these requirements, it is therefore known in automotive engineering to coat plastic parts with 2-component thermoset. For this purpose, a plastic part is first produced in an appropriate tool using an injection molding machine. Then it is removed from the tool and inserted into a second tool, in which a 2-component thermoset layer, e.g. B. made of polyurethane (PU layer) is applied.
Diese Art der Aufbringung der PU-Schicht ist wegen der zwei verwendeten Werkzeuge sowohl arbeits- als auch zeitaufwendig.This way of applying the PU layer is both laborious and time-consuming because of the two tools used.
Weiterhin ist aus der DE 35 44 040 AI bekannt, auf den in einem ersten Arbeitsgang hergestellten Kunststoffkörper einen gesondert hergestellten Schaumstoffkörper aufzulegen und beide in einem zweiten Arbeitsgang durch Erhitzung miteinader zu verbinden. Weiterhin ist aus dieser Druckschrift bekannt, an den gesondert vorgeformten Schaumstoff - körper ein Kunststoffteil durch Spritzpressen anzuformen.Furthermore, it is known from DE 35 44 040 AI to place a separately produced foam body on the plastic body produced in a first operation and to connect the two by heating in a second operation. It is also known from this document to mold a plastic part onto the separately preformed foam body by injection molding.
Weiterhin ist es bekannt, (Kautschuk Gummi Kunststoffe 49. Jahrgang, Nr.7-8/96, S. 486) die komplette Auswerferseite des Werkzeugs zu drehen und den am Kern verbliebenen Vor- spritzling in eine neue matrizenseitige Werkzeughöhlung einzusetzen .Furthermore, it is known (rubber rubber plastics 49th year, No. 7-8 / 96, p. 486) to turn the complete ejector side of the tool and to insert the pre-molded part remaining on the core into a new die-side tool cavity.
Auch diesen Verfahren haftet der Nachteil an, daß sie wegen der Verwendung mehrerer Werkzeuge arbeits- und zeitaufwendig sind.These processes also have the disadvantage that they are laborious and time-consuming because of the use of several tools.
Der Erfindung liegt deshalb die Aufgabe zugrunde, die Herstellung eines Verbundteiles aus Kunststoff und 2 -Komponenten-Duroplast zu vereinfachen. Erfindungsgemäß wird das gemäß den Merkmalen der Ansprüche 1, 4 und 5 erreicht.The invention is therefore based on the object of simplifying the production of a composite part made of plastic and 2-component thermoset. According to the invention this is achieved according to the features of claims 1, 4 and 5.
Bei einem Verfahren zur Herstellung eines Mehrschicht -Kunst - stoffteils bei dem ein Kunststoff -Spritzgußteil mit mindestens einer Schicht aus 2 -Komponenten-Duroplast beschichtet wird, werden erfindungsgemäß das Kunststoffteil und die Schicht aus 2 -Komponenten-Duroplast nacheinander zyklussynchron im selben Werkzeug gespritzt. Dabei wird vorzugsweise erst der Kunststoffkörper gespritzt und nach Veränderung des Werkzeugs zur Erzeugung eines der Dicke der Schicht des 2 -Komponenten-Duroplasts entsprechenden Hohlraumes im Werkzeug wird das 2 -Komponenten-Duroplast eingebracht.In a method for producing a multi-layer plastic part in which a plastic injection molded part is coated with at least one layer of two-component thermoset, according to the invention the plastic part and the layer of two-component thermoset are successively injection-molded in the same mold in a cycle-synchronized manner. The plastic body is preferably first injected, and after changing the tool to produce a cavity in the tool corresponding to the thickness of the layer of the 2-component thermoset, the 2-component thermoset is introduced.
Die rationelle Fertigung eines Mehrschicht-Kunststoffteils mit einer Schicht aus 2 -Komponenten-Duroplast in einem einzigen Werkzeug ist insbesondere wegen der zyklussynchronen Herstellung des Kunststoffteils und der Schicht aus 2 -Komponenten-Duroplast möglich. Das heißt, für die • Herstellung des Kunststoffteils und der Schicht wird die gleiche Zeit benötigt. Dadurch ist es möglich, daß die Herstellung von Mehrschicht-Kunststoffteilen gleichzeitig mittels mehrerer Werkzeuge erfolgen kann, wobei in einem Werkzeug die Be- schichtung eines vorher gefertigten Kunststoffteils erfolgt, während in einem zweiten Werkzeug bereits ein nächstes Kunststoffteil gespritzt wird.The rational production of a multi-layer plastic part with a layer of 2-component thermoset in a single tool is possible in particular because of the cycle-synchronous production of the plastic part and the layer of 2-component thermoset. This means that the same time is required to produce the plastic part and the layer. This makes it possible for the production of multi-layer plastic parts to be carried out simultaneously by means of several tools, one plastic part being coated in one tool, while a second plastic part is already being injection molded in a second tool.
Die Zyklussynchronisation wird vorzugsweise dadurch erzielt, daß die Reaktionszeit des 2 -Komponenten-Duroplasts an die Zeit für das Spritzen des Kunststoffteils angepaßt wird. In der Regel wird für das Spritzen eines Kunststoff- teils eine kürzere Zeit benötigt als für die Herstellung eines Teils aus 2 -Komponenten-Duroplast , so daß dessen Reaktionszeit verkürzt werden muß. Das Verfahren ist vorzugsweise für das Aufbringen einer Schicht aus Polyurethan auf ein Kunststoffteil bestimmt.The cycle synchronization is preferably achieved by adapting the reaction time of the 2-component thermoset to the time for the injection molding of the plastic part. As a rule, a shorter time is required for the injection molding of a plastic part than for the production of a part from two-component thermosetting plastic, so that its reaction time must be shortened. The method is preferably intended for applying a layer of polyurethane to a plastic part.
Eine Vorrichtung zur Herstellung eines Mehrschicht -Kunststoffteils unter Verwendung einer Spritzgußmaschnine, ist erfindungsgemäß dadurch gekennzeichnet, daß in der Spritz - gußmaschine eine RIM-Vorrichtung zum Einbringen eines 2 -Komponenten-Duroplasts in ein Mehrkomponenten-Spritzgußwerkzeug vorgesehen ist. Diese Vorrichtung stellt eine spezielle Vorrichtung zur Durchführung des Verfahrens dar.A device for producing a multi-layer plastic part using an injection molding machine is characterized according to the invention in that a RIM device is provided in the injection molding machine for introducing a 2-component thermoset into a multi-component injection molding tool. This device represents a special device for performing the method.
Das Verfahren ist aber auch mit einer Kunststoff- Spritzgußmaschine und einer RIM-Anlage, d.h. mit zwei getrennten Maschinen ausführbar, die handelsüblich sind. Die Fertigung erfolgt in zwei Werkzeugen, die miteinander verkettet sind.However, the process can also be carried out using a plastic injection molding machine and a RIM system, i.e. Can be carried out with two separate machines that are commercially available. The production takes place in two tools that are linked together.
Zur rationellen Herstellung der Mehrschicht-Kunststoffteile ist es zweckmäßig, daß eine bewegbare Vorrichtung mit mindestens zwei Spritzgußwerkzeugen vorgesehen ist, wobei in Arbeitsstellung ein Spritzgußwerkzeug mindestens einer Spritzdüse der Spritzgußmaschnine und ein zweites Spritzgußwerkzeug mindestens einer Mischdüse der RIM-Anlage oder der RIM-Vorrichtung in der Spritzgußmaschine zugeordnet ist. Vorzugsweise ist die bewegbare Vorrichtung als drehbare Vorrichtung ausgebildet . Bei Anordnung von zwei gleichen Werkzeugen, ist jedes Werkzeug abwechselnd mit der Spritzdüse und der Mischdüse verbunden.For the rational production of the multilayer plastic parts, it is expedient that a movable device is provided with at least two injection molding tools, with an injection molding tool of at least one injection nozzle of the injection molding machine and a second injection molding tool of at least one mixing nozzle of the RIM system or the RIM device in the working position Injection molding machine is assigned. The movable device is preferably designed as a rotatable device. If two identical tools are arranged, each tool is alternately connected to the spray nozzle and the mixing nozzle.
Für die Verkettung der Spritzgußmaschine und der RIM-Anlage ist zweckmäßig ein Handlinggerät und eine gemeinsame Steuerung vorgesehen. Mit dem Handlinggerät sind die Mehrkompo- nenten-Kavitäten der Spritzgußmaschine und der RIM-Anlage zuordenbar. In einer weiteren Ausführungsform ist vorgesehen, daß die Spritzgußwerkzeuge gleiche Werkzeughälften aufweisen, denen an der Spritzdüse und an der Mischdüse unterschiedlich tiefe Matrizen zugeordnet sind, wobei zwischen der der Spritzdüse zugeordneten Matrize und der jeweiligen Werkzeughälfte ein Freiraum mit den Abmessungen des Kunststoffteils vorhanden ist, während zwischen der der Mischdüse zugeordneten Matrize und der jeweiligen Werkzeughälfte ein Freiraum mit den Abmessungen des mit einer SchaumstoffSchicht versehenen Kunststoffteils vorgesehen ist .A handling device and a common control system are expediently provided for linking the injection molding machine and the RIM system. The multi-component cavities of the injection molding machine and the RIM system can be assigned with the handling device. In a further embodiment it is provided that the injection molds have the same mold halves, to which matrices of different depths are assigned on the spray nozzle and on the mixing nozzle, with a space with the dimensions of the plastic part being present between the mold nozzle assigned to the spray nozzle and the respective mold half A free space with the dimensions of the plastic part provided with a foam layer is provided between the die assigned to the mixing nozzle and the respective tool half.
Das Mehrkomponenten-Spritzgußwerkzeug besteht vorzugsweise aus Metall. Es ist weiterhin zweckmäßig, daß das Mehrkomponenten-Spritzgußwerkzeug eine verdeckte Teilungsebene aufweist, um Gratbildung auf der sichtbaren Oberfläche der hergestellten Teile zu vermeiden.The multi-component injection molding tool is preferably made of metal. It is furthermore expedient for the multi-component injection molding tool to have a hidden parting plane in order to avoid burr formation on the visible surface of the parts produced.
Die Erfindung soll in Ausführungsbeispielen anhand von Zeichnungen erläutert werden. Es zeigen:The invention will be explained in exemplary embodiments with reference to drawings. Show it:
Fig. 1 eine schematische Darstellung zweier schwenkbar angeordneter Werkzeuge mit darin hergestellten Teilen und mit zugeordneter Spritz- und Mischdüse ;Figure 1 is a schematic representation of two pivotally arranged tools with parts manufactured therein and with an associated spray and mixing nozzle.
Fig. 2 die Vorrichtung nach Fig. 1 vor einem Spritzbzw. Beschichtungsvorgang;Fig. 2 shows the device of FIG. 1 before a spray or. Coating process;
Fig. 3 die Vorrichtung nach Fig. 2 nach Beendigung des Spritz- bzw. Beschichtungsvorganges;3 shows the device according to FIG. 2 after the end of the spraying or coating process;
Fig. 4a, b einen Ausschnitt eines Werkzeugs mit verdeckter Teilungsebene im Schnitt; Fig. 5 eine schematische Darstellung einer Vorrichtung mit zwei Werkzeugen und Handlinggerät;4a, b show a section of a tool with a hidden parting plane in section; 5 shows a schematic illustration of a device with two tools and handling device;
Fig. 6 den zeitlichen Verlauf des Verfahrens.Fig. 6 shows the course of the process over time.
Die Vorrichtung nach Fig. 1 weist eine Grundplatte 1 auf, die zwei gleiche Werkzeughälften 2, 3 trägt und drehbar um eine Achse la gelagert ist. Jede Werkzeughälfte ist mit einem Auswerfer 4 bzw. 5 versehen, von denen jeder zwei Auswerferstifte 6, 7 bzw. 8, 9 hat.1 has a base plate 1 which carries two identical tool halves 2, 3 and is rotatably mounted about an axis la. Each tool half is provided with an ejector 4 or 5, each of which has two ejector pins 6, 7 and 8, 9.
Den Werkzeughälften 2, 3 gegenüber ist eine Matrize 10 einer Spritzgußmaschine 11 sowie eine Matrize 12 einer RIM-Vorrichtung 13 vorgesehen. Der Matritze 10 ist eine Spritzdüse 14 und der RIM-Vorrichtung 13 eine Mischdüse 15 zugeordnet .A die 10 of an injection molding machine 11 and a die 12 of a RIM device 13 are provided opposite the tool halves 2, 3. The die 10 is assigned a spray nozzle 14 and the RIM device 13 a mixing nozzle 15.
Die der Spritzgußmaschine 11 zugeordnete Matrize 10 weist einen solchen Verlauf ihrer Oberfläche 16 auf, daß bei Auflage der Matrize 10 auf der Patritze zwischen beiden ein Freiraum vorhanden ist, der der Dicke eines zu spritzenden Kunststoffteils 17 entspricht.The die 10 assigned to the injection molding machine 11 has such a profile of its surface 16 that when the die 10 is placed on the patrix there is a free space between the two which corresponds to the thickness of a plastic part 17 to be injection molded.
Die der RIM-Vorrichtung 13 zugeordnete Matrize 12 weist einen solchen Verlauf ihrer Oberfläche 18 auf, daß bei Auflage der Matrize 12 auf der Patritze zwischen beiden ein Freiraum vorhanden ist, der der Dicke des mit einer Schaumstoffschicht 19 versehenen Kunststoffteils 17 entspricht .The die 12 assigned to the RIM device 13 has such a profile of its surface 18 that when the die 12 is placed on the patrix there is a free space between the two which corresponds to the thickness of the plastic part 17 provided with a foam layer 19.
Die Grundplatte 1 ist gegenüber den Matrizen 10, 12 verfahrbar. In der Fig. 1 sind die Werkzeuge in geöffneter Stellung dargestellt, in der das fertig gespritzte und mit einer Schicht 19 aus 2 -Komponenten-Duroplast versehene Kunststoffteil 17 mit Hilfe der Auswerferstifte 6, 7 aus der Werkzeughälfte 2 entnommen werden kann. Das Kunststoff - teil 17 in der Werkzeughälfte 3 verbleibt dagegen dort.The base plate 1 can be moved relative to the matrices 10, 12. In Fig. 1, the tools are shown in the open position, in which the injection molded and provided with a layer 19 of 2-component thermosetting plastic part 17 using the ejector pins 6, 7 the tool half 2 can be removed. The plastic part 17 in the mold half 3, however, remains there.
Nach der Entnahme des Teils aus der Werkzeughälfte 2 wird die Grundplatte 1 um 180° gedreht, so daß nunmehr die Werkzeughälfte 3 mit dem Kunststoffteil 17 der Matrize 12 gegenübersteht und die leere Werkzeughälfte 2 der Matrize 10 gegenüberliegt, wie es in Fig, 2 dargestellt ist. In dieser Figur ist die Grundplatte 1 in Richtung der Matrizen so verfahren, daß die Werkzeughälfte 2 an der Matrize 10 und die Werkzeughälfte 3 an der Matrize 12 anliegt und die Werkzeuge damit geschlossen sind. Nunmehr können gleichzeitig das Kunststoffteil 17 mittels der Spritzdüse 14 im Spritzgußverfahren hergestellt werden und im anderen Werkzeug das Kunststoffteil 17 über die Düse 15 mit einer Duroplastschicht versehen werden, wie es in Fig. 3 dargestellt ist .After removing the part from the tool half 2, the base plate 1 is rotated by 180 °, so that the tool half 3 with the plastic part 17 now faces the die 12 and the empty tool half 2 faces the die 10, as shown in FIG. 2 . In this figure, the base plate 1 is moved in the direction of the dies in such a way that the tool half 2 rests on the die 10 and the tool half 3 rests on the die 12 and the tools are thus closed. Now the plastic part 17 can be produced simultaneously by means of the injection nozzle 14 in the injection molding process and in the other tool the plastic part 17 can be provided with a thermoset layer via the nozzle 15, as shown in FIG. 3.
In den Figuren 4a und b ist eine spezielle Ausführungsform des Werkzeugs dargestellt, bei der eine verdeckte Teilung vorgesehen ist. Bei dieser Ausführungsform weisen die Werkzeughälften 2, 3 einerseits und die Matrizen 10, 12 andererseits zwei versetzt zueinander angeordnete Teilungsebenen 20, 21 auf. In der Fig. 4a sind die Werkzeughälfte 2 bzw. 3 und die zugehörige Matrize 10 für die Herstellung des Kunststoffteils 17 dargestellt. Dort ist eine äußere Teilungsebene 21 und um ein Maß a versetzt dazu eine innere Teilungsebene 20 vorgesehen. So entsteht ein Trennstelle, die einen gegenüber der Teilungsebene 21 abgewinkelten Abschnitt 21a aufweist, der etwa senkrecht zu den Rändern des hergestellten Teils verläuft.A special embodiment of the tool is shown in FIGS. 4a and b, in which a concealed division is provided. In this embodiment, the tool halves 2, 3, on the one hand, and the dies 10, 12, on the other hand, have two dividing planes 20, 21 arranged offset from one another. 4a shows the tool half 2 or 3 and the associated die 10 for the production of the plastic part 17. There is an outer parting plane 21 and an inner parting plane 20 offset from it by a dimension a. This creates a separation point which has a section 21a which is angled with respect to the parting plane 21 and which runs approximately perpendicular to the edges of the part produced.
Auch das folgende Werkzeug zum Aufbringen der Duroplast- schicht 19 auf das Kunststoffteil 17 unter Verwendung der Matrize 12 weist identische, um das Maß a versetzte Teilungsebenen 20, 21 auf, wie es in Fig. 4b dargestellt ist.The following tool for applying the thermoset layer 19 to the plastic part 17 using the Die 12 has identical dividing planes 20, 21 offset by dimension a, as shown in FIG. 4b.
Aufgrund der versetzten Teilungsebenen ist die Außenseite des beschichteten Teils gratfrei. Der hierbei am Rand auftretende Grat ist weniger störend und braucht unter Umständen nicht entfernt zu werden.Due to the offset division levels, the outside of the coated part is burr-free. The burr that appears on the edge is less annoying and may not need to be removed.
Während beim Ausführungsbeispiel der Figuren 1 bis 3 eine Spritzgußmaschine mit einer darin integrierten RIM-Vorrichtung dargestellt ist, sind beim Ausführungsbeispiel der Fig.5 eine Spritzgußmaschine 22 und eine RIM-Anlage 23 vorgesehen, die handelsüblich sind. Diese sind durch ein lediglich prinzipiell dargestelltes Handlinggerät 24 miteinander verkettet, dessen Betätigungsarm sowohl quer und senkrecht zu den nebeneinander aufgestellten Maschinen bewegbar als auch schwenkbar ist, und weisen eine gemeinsame Steuerung auf .While an injection molding machine with an integrated RIM device is shown in the embodiment of FIGS. 1 to 3, an injection molding machine 22 and a RIM system 23 are provided in the embodiment of FIG. 5, which are commercially available. These are linked together by a handling device 24, which is only shown in principle, the actuating arm of which can be moved and swiveled both transversely and perpendicularly to the machines placed next to one another, and have a common control.
Der Verfahrensablauf ist nochmals in der Fig. 6 dargestellt. Zur Herstellung des ersten Kunststoffteils 17 wird unter einem Druck von 800 - 1000 bar während 2, 5 Sekunden Kunststoff mit einer Temperatur von 230°C über die Spritzdüse 14 in das erste Werkzeug eingespritzt. Anschließend wird über einen Zeitraum von 10 Sekunden ein Nachdruck von 400 bar ausgeübt. Daran schließt sich eine Abkühlzeit von 25 Sekunden an. Damit ist der Herstellungsprozeß des Kunststoffteils 17 abgeschlossen. Wie vorher beschrieben, wird durch Drehen der Grundplatte 1 die Kavität gewechselt . Dieser Vorgang dauert ca. 6 Sekunden.The process sequence is shown again in FIG. 6. To produce the first plastic part 17, plastic is injected into the first tool at a pressure of 800-1000 bar for 2.5 seconds at a temperature of 230 ° C. via the spray nozzle 14. A pressure of 400 bar is then applied over a period of 10 seconds. This is followed by a cooling time of 25 seconds. The manufacturing process of the plastic part 17 is thus completed. As previously described, the cavity is changed by rotating the base plate 1. This process takes about 6 seconds.
Anschließend werden zeitsynchron das zweite Kunststoffteil 17 unter den vorgenannten Bedingungen hergestellt und das erste Kunststoffteil 17 mit der SchaumstoffSchicht 19 aus Polyurethan beschichtet. Die Beschichtung erfolgt in der Weise, daß über nicht dargestellte Hochdruckpumpen zwei flüssige Komponenten unter einem Druck von 170 bis 230 bar in einem vorgegebenen Mischungsverhältnis innerhalb von 2, 5 Sekunden über die Mischdüse 15 in die Form gegossen werden. Nach einer Reaktionszeit von 30 Sekunden bei einer Formtemperatur von 50 bis 70° C wird das komplette erste Kunststoffteil aus dem Werkzeug entnommen. Anschließend wird das zeitsynchron hergestellte zweite Kunststoffteil durch Drehen der Grundplatte 1 zur Beschichtung mit der Schaumstoffschicht 19 in den Bereich der Matrize 12 gedreht . Der beschriebene zeitsychrone Vorgang wiederholt sich nun, wie es auch in der Fig. 6 dargestellt ist. The second plastic part 17 is then produced synchronously under the aforementioned conditions and the first plastic part 17 is coated with the foam layer 19 made of polyurethane. The coating is carried out in such a way that two high-pressure pumps, not shown liquid components are poured into the mold via the mixing nozzle 15 at a pressure of 170 to 230 bar in a predetermined mixing ratio within 2.5 seconds. After a reaction time of 30 seconds at a mold temperature of 50 to 70 ° C, the entire first plastic part is removed from the tool. The time-synchronously produced second plastic part is then rotated into the area of the die 12 by rotating the base plate 1 for coating with the foam layer 19. The time-synchronous process described is now repeated, as is also shown in FIG. 6.

Claims

Patentansprüche claims
1. Verfahren zur Herstellung eines Mehrschicht -Kunst - stoffteils bei dem ein Kunststoff-Spritzgußteil mit mindestens einer Schicht aus 2 -Komponenten-Duroplast beschichtet wird,1. Method for producing a multi-layer plastic part, in which a plastic injection molded part is coated with at least one layer of 2-component thermoset,
dadurch gekennzeichnet,characterized,
daß das Kunststoffteil und die Schicht aus 2 -Komponenten-Duroplast nacheinander zyklussynchron im selben Werkzeug gespritzt werden.that the plastic part and the layer of 2-component thermosetting plastic are successively injection-molded in the same mold.
Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Reaktionszeit des 2 -Komponenten-Duroplasts an die Zeit für das Spritzen des Kunststoffteils angepaßt wird.A method according to claim 1, characterized in that the reaction time of the 2-component thermoset is adapted to the time for the injection molding of the plastic part.
Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß auf ein Kunststoffteil eine Schicht aus Polyurethan aufgebracht wird.Method according to claim 1 or 2, characterized in that a layer of polyurethane is applied to a plastic part.
Vorrichtung zur Herstellung eines Mehrschicht-Kunststoffteils unter Verwendung 'einer Spritzgußmaschine, insbesondere zur Durchführung des Verfahrens nach mindestens einem der Ansprüche 1 bis 3 , dadurch gekennzeichnet, daß in der Spritzgußmaschine (11) eine RIM-Vorrichtung (13) zum Einbringen eines 2 -Komponenten-Duroplasts in ein Mehrkomponenten- Spritzgußwerkzeug vorgesehen ist. An apparatus for producing a multi-layer plastic part using 'an injection molding machine, in particular for implementing the method according to at least one of claims 1 to 3, characterized in that in the injection molding machine (11), a RIM apparatus (13) for introducing a 2 components -Duroplasts is provided in a multi-component injection molding tool.
Vorrichtung zur Herstellung eines Mehrschicht-Kunststoffteils unter Verwendung einer Spritzgußmaschine, insbesondere zur Durchführung des Verfahrens nach mindestens einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Spritzgußmaschine (22) und eine RIM-Anlage (23) miteinander verkettet sind. Device for producing a multi-layer plastic part using an injection molding machine, in particular for carrying out the method according to at least one of claims 1 to 3, characterized in that the injection molding machine (22) and a RIM system (23) are linked together.
Vorrichtung nach Anspruch 4 oder 5, dadurch gekennzeichnet, daß eine bewegbare Vorrichtung (1) mit mindestens zwei Spritzgußwerkzeugen (2, 3, 10, 12) vorgesehen ist, wobei in Arbeitsstellung ein Spritz - gußwerkzeug mindestens einer Spritzdüse (14) der Spritzgußmaschine (11) und ein zweites Spritzgußwerkzeug mindestens einer Mischdüse (15) der RIM- Anlage (23) oder der RIM-Vorrichtung (13) zugeordnet ist.Device according to claim 4 or 5, characterized in that a movable device (1) with at least two injection molding tools (2, 3, 10, 12) is provided, with an injection molding tool of at least one injection nozzle (14) of the injection molding machine (11 ) and a second injection molding tool is assigned to at least one mixing nozzle (15) of the RIM system (23) or the RIM device (13).
7. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, daß als bewegbare Vorrichtung eine drehbare Grundplatte (1) vorgesehen ist.7. The device according to claim 6, characterized in that a rotatable base plate (1) is provided as a movable device.
Vorrichtung nach mindestens einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß für die Verkettung ein Handlinggerät (24) vorgesehen ist, mit dem die Mehrkomponenten-Kavitäten der Spritzgußmaschine (22) und der RIM-Anlage (23) zuordenbar sind.Device according to at least one of the preceding claims, characterized in that a handling device (24) is provided for the interlinking, with which the multi-component cavities of the injection molding machine (22) and the RIM system (23) can be assigned.
Vorrichtung nach mindestens einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Spritzgußwerkzeuge gleiche Werkzeughälften (2, 3) aufweisen, denen an der Spritzdüse (14) und an der Mischdüse (15) unterschiedlich tiefe Matrizen (10, 12) zugeordnet sind, wobei zwischen der, der Spritz - düse (14) zugeordneten, Matrize (10) und der jeweiligen Werkzeughälfte ein Freiraum mit den Abmessungen des Kunststoffteils (17) vorhanden ist, während zwischen der, der Mischdüse (15) zugeordneten, Matrize (12) und der jeweiligen Werkzeughälfte ein Freiraum mit den Abmessungen des mit einer Schaumstoffschicht (19) versehenen Kunststoffteils (17) vorgesehen ist .Device according to at least one of the preceding claims, characterized in that the injection molding tools have the same tool halves (2, 3) The matrices (10, 12) of different depths are assigned to the spray nozzle (14) and the mixing nozzle (15), there being a free space between the die (10) assigned to the spray nozzle (14) and the respective tool half with the dimensions of the plastic part (17) is provided, while between the die (12) assigned to the mixing nozzle (15) and the respective tool half there is a space with the dimensions of the plastic part (17) provided with a foam layer (19).
10. Vorrichtung nach mindestens einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das Mehrkomponenten-Spritzgußwerkzeug aus Metall besteht .10. The device according to at least one of the preceding claims, characterized in that the multi-component injection molding tool consists of metal.
11. Vorrichtung nach mindestens einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das Mehrkomponenten-Spritzgußwerkzeug eine verdeckte Teilungsebene (21) aufweist. 11. The device according to at least one of the preceding claims, characterized in that the multi-component injection molding tool has a hidden parting plane (21).
PCT/DE1997/002824 1996-11-27 1997-11-25 Method and device for producing a multilayer plastic element WO1998023431A1 (en)

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DE19650854A DE19650854C1 (en) 1996-11-27 1996-11-27 Injection-moulding an object and covering it with polyurethane using two-component plastic
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US7306445B2 (en) * 2001-08-03 2007-12-11 Krauss-Maffei Kunststofftechnik Gmbh Mold closing device for an injection molding machine
EP2684744B1 (en) 2012-07-09 2018-05-02 Wiegand GmbH Trim part for motor vehicles and method for its production
US10814803B2 (en) 2015-06-03 2020-10-27 Weidplas Gmbh Component
CN109249578A (en) * 2017-07-13 2019-01-22 城翊科技有限公司 Thick member plastic cement injection forming method and its mold

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EP0946347A1 (en) 1999-10-06

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