WO1989011386A1 - Process for accurately positioning cores and/or mats in plastic mouldings - Google Patents

Process for accurately positioning cores and/or mats in plastic mouldings Download PDF

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Publication number
WO1989011386A1
WO1989011386A1 PCT/DE1989/000306 DE8900306W WO8911386A1 WO 1989011386 A1 WO1989011386 A1 WO 1989011386A1 DE 8900306 W DE8900306 W DE 8900306W WO 8911386 A1 WO8911386 A1 WO 8911386A1
Authority
WO
WIPO (PCT)
Prior art keywords
needles
mold
plastic
cavity
mats
Prior art date
Application number
PCT/DE1989/000306
Other languages
German (de)
French (fr)
Inventor
Marianne Wieser
Original Assignee
Marianne Wieser
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 Marianne Wieser filed Critical Marianne Wieser
Publication of WO1989011386A1 publication Critical patent/WO1989011386A1/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
    • B29C45/14—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
    • B29C45/14065—Positioning or centering articles in the mould
    • B29C45/14073—Positioning or centering articles in the mould using means being retractable during injection
    • 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
    • B29C45/14065—Positioning or centering articles in the mould
    • B29C45/14073—Positioning or centering articles in the mould using means being retractable during injection
    • B29C2045/1409—Positioning or centering articles in the mould using means being retractable during injection using control means for retraction of the centering means

Definitions

  • the invention relates to a method for the positionally accurate introduction of cores and / or mats into plastic molded parts and devices for carrying out this method.
  • core / mat are to be interpreted broadly and include cores made of any materials, in particular also made of foamed plastic, mats, woven fabrics of all kinds, metal inserts, nets, etc. It is desirable that the hardened molded part has the desired shape Encloses and encloses the core or the mat in a specific position. The fact is, however, that after the plastic has been introduced, the core or mat moves upwards or downwards in an undesirable manner due to buoyancy and flow influences. In order to remedy this, it is known in the prior art to clamp the cores or mat on the edge during the spraying and curing process.
  • the decisive disadvantage of this measure is that the core or mat is not covered on all sides or are insulated from the outside.
  • Another method is to fix the core or mat spatially by introducing pins or blocks into the mold and then to fill the mold with plastic and to enclose blocks and pins with the exception of their contact surface at all times. Corrosion is caused by the fact that it is not embedded in the plastic due to the system.
  • the invention has set itself the task of creating a method and an associated device in which the production of plastic molded parts with cores and / or mats therein is possible with a trace-free coating.
  • This object is achieved, according to the invention, by engaging in the cavity of the mold from above and / or below, essentially vertically oriented needle, which are retractable, and which are attached to the front of the core and / or the mat from above and / or brought to the bottom, then the plastic is injected and the needles are withdrawn from the cavity in the pasty state.
  • One of the most important ideas of the present invention is to fix the core or mat to be enclosed by the plastic within the cavity of the mold in the later desired position, to maintain this during the injection of the plastic, but in order to cure it before curing retract while still doughy.
  • the fine openings left in the plastic material by the needles are practically completely closed due to the plasticity of the material.
  • the position in which the core or mat is fixed in the cavity of the mold is basically arbitrary in the context of the invention. It is also not absolutely necessary for the needles to engage in the mold from above and simultaneously from below. For example, needles reaching into the cavity of the mold reach from below when the core or mat sinks downward in the initially still liquid plastic. Similarly, in the event of a tendency to float, needles need to be inserted from the top into the cavity.
  • the number of needles and their spacing from one another is determined and depends on the shape and shape of the cavity. In addition to the number of needles, the weight of the core or mat also determines their respective diameters in order to be able to apply the necessary support forces without problems.
  • the procedure is such that first the mold is opened, the lower needles, if present, are extended into the cavity and the core or mat is placed on top. Then the mold is closed and the upper needles, if present, rest with their end faces against the core or mat from above. The plastic is then introduced in a manner known per se, the needles withdrawn during curing, so that the finished product can be removed from the mold once it has hardened.
  • the advantages of the method according to the invention consist in the fact that the core is coated and insulated from all sides in a single operation. This plastic cover is free of traces and contains no pins or the like. The result is a product with a precisely positioned core or mat, all-round sheathing and a perfect surface.
  • the use of needles of the smallest possible diameter is recommended.
  • An independent closure of the openings is not easy due to the insufficient flowability of the plastic material or due to the material shrinkage. possible, it is recommended by the invention that after the needles have been withdrawn, a certain amount of plastic is injected again, that is to say a so-called reprint. In this way, on the one hand, the missing material is made available that, in a highly flowable state, the openings left behind in the plastic easily close.
  • the needles are not withdrawn too early, that is to say in the case of highly viscous plastic, and not too late when the curing is almost complete.
  • data can be determined empirically, which indicate when the needles should be withdrawn after the injection pressure has taken place.
  • the invention recommends that the temperature of the plastic be recorded in the mold by means of a sensor, from which the course of the curing process can then be followed and read quite exactly.
  • a method for ejecting the finished, ie cured, molded part is carried out proposed the mold in that needles are also arranged to engage in the cavity of the mold from above and / or below, which are retractable and eject the molded part after the hardening and opening of the mold via the needles.
  • the needles that can be inserted and withdrawn in the cavity of the mold are equally available for both processes.
  • a device is described in more detail below which is particularly suitable for carrying out the aforementioned method.
  • a mold and a filling nozzle required for introducing the plastic.
  • essentially vertically aligned needles are arranged which engage in the cavity of the mold, which will later be acted upon by the plastic material, from above and / or below and can be retracted via actuators.
  • the path of movement is measured such that, when extended, the needles protrude into the cavity to a certain depth; in the retracted state, however, the needles disappear completely in the form, so that the cavity is completely free.
  • the extension of the needles can be used to eject the hardened molded part.
  • the needles remain extended until the introduced plastic hardens.
  • the needles are moved via actuators which are controlled from the outside. Leads lead to the outside from the actual actuators that move the needles.
  • the concrete structural design of the actuating members is free within the scope of the invention.
  • the use of hydraulic or pneumatic cylinders, from which to the outside, is considered to be particularly advantageous leading lines and connected to a pump via a control unit are arranged.
  • the needle on each side (top / bottom) can be supplied simultaneously via one and the same line.
  • the cylinders themselves are molded and the needles move in the manner of pistons and piston rods.
  • the hydraulic or pneumatic medium acts on the side of the cylinder opposite the needle.
  • the mold (1) has a filling nozzle (2) and an interior cavity (3) which determines the contour of the molded part to be produced.
  • the shape (1) runs at the level of the cavity (3) and enables the removal of the finished plastic molded part Cutting surface (4) running perpendicular to the plane of the drawing. It also runs from the filling nozzle
  • the needles (6, 7) are guided in the manner of a piston or a piston rod in cylinders (8, 9).
  • the displacement is brought about in that the cylinders (8, 9) in the needle (6, 7) opposite chamber with a hydraulic and pneumatic medium via a supply that supplies all the cylinders (8) located on the top side ⁇ device (10) and a further, the lower cylinder (g) supply line (II) are connected.
  • They are based on a pump (12) that generates an overpressure or underpressure. If the pressure is high, the needles (6, 7) are inserted into the cavity (3) and withdrawn if the pressure is negative.
  • the control takes place in such a way that when the lower needles (7) are extended and the mold (1) is open, the mat (13) is placed on, which is then to be closed, and then the cavity (3) via the filling nozzle (2) is filled with plastic.
  • the dough is still in its
  • the needles (6, 7) are withdrawn completely, additional plastic material may then be injected and the curing awaited. After opening mold (1), the finished molded part can be easily ejected by pushing the needles (6) or (7) forward.
  • the result is a device which, on the one hand, allows the exact positioning of the core or mats inside the molded plastic parts and / or the ejection.

Abstract

In a device for producing plastic mouldings, needles (6, 7) which engage from above and/or bellow are arranged in a cavity (3) inside the mould (1) and can be retracted from the outside by means of controllable actuating elements, for example cylinders (8, 9). The device is used to accurately position cores or mats in plastic mouldings and/or to eject the cured end product.

Description

Verfahren zum positionsexak¬ Positionexak¬ method
ten Einbringen von Kernen und/oder Matteninsertion of cores and / or mats
in Kunststofformteilein plastic moldings
Die Erfindung betrifft ein Verfahren zum positions¬ exakten Einbringen von Kernen und/oder Matten in Kunststofformteile sowie Vorrichtungen zur Durch- führung dieses Verfahrens.The invention relates to a method for the positionally accurate introduction of cores and / or mats into plastic molded parts and devices for carrying out this method.
Es ist bekannt zur Verringerung des Eigengewichtes oder zur Erhöhung der Stabilität in Formteilen aus Kunststoff Kerne und/oder Matten einzubringen. Da- bei sind die Begriffe "Kern/Matte" weit auszulegen und u faßen Kerne aus beliebigen Materialien, ins¬ besondere auch aus geschäumten Kunststoff, Matten, Gewebe jeder Art, Metalleinlagen, Netze usw. Wün¬ schenswert ist, daß das ausgehärtete Formteil den Kern oder die Matte in ganz bestimmter Position ein- und umschließt. Tatsache ist jedoch, daß nach dem Einbringen des Kunststoffes sich Kern oder Matte nach oben oder unten zu aufgrund Auf¬ triebs- und Strömungseinflüsse in unerwünschter Weise verschieben. Um hier Abhilfe zu schafffen ist es im Stande der Technik bekannt, die Kerne oder Matte während des Spritz- und Aushärtvor¬ ganges randseitig festzuklemmen. Der entschei¬ dende Nachteil dieser Maßnahme besteht darin, daß Kern oder Matte nicht allseitig ummantelt bzw. nach außen isoliert sind. Eine andere Me¬ thode besteht darin, durch Einbringen von Stif¬ ten oder Klötzen in die Form Kern oder Matte räumlich zu fixieren und anschließend die Form mit Kunststoff zu füllen und dabei auch Klötze und Stifte mit Ausnahme ihrer Au lagefläche allzeitig zu umschließen. Durch die nach außen zu aufgrund der Anlage nicht erfolgte Einbet¬ tung in den Kunststoff werden Korrosionen her- vorgerufen.It is known to reduce the dead weight or to increase the stability in molded parts made of plastic cores and / or mats. The terms "core / mat" are to be interpreted broadly and include cores made of any materials, in particular also made of foamed plastic, mats, woven fabrics of all kinds, metal inserts, nets, etc. It is desirable that the hardened molded part has the desired shape Encloses and encloses the core or the mat in a specific position. The fact is, however, that after the plastic has been introduced, the core or mat moves upwards or downwards in an undesirable manner due to buoyancy and flow influences. In order to remedy this, it is known in the prior art to clamp the cores or mat on the edge during the spraying and curing process. The decisive disadvantage of this measure is that the core or mat is not covered on all sides or are insulated from the outside. Another method is to fix the core or mat spatially by introducing pins or blocks into the mold and then to fill the mold with plastic and to enclose blocks and pins with the exception of their contact surface at all times. Corrosion is caused by the fact that it is not embedded in the plastic due to the system.
Hiervon ausgehend hat sich die Erfindung die Schaffung eines Verfahrens sowie einer zugehöri¬ ge Vorrichtung zur Aufgabe gemacht, bei der die Herstellung von Kunststof ormteilen mit darin befindlichen Kernen und/oder Matten bei spuren¬ freier Um antelung möglich wird.Proceeding from this, the invention has set itself the task of creating a method and an associated device in which the production of plastic molded parts with cores and / or mats therein is possible with a trace-free coating.
Gelöst wird diese Aufgabe er indungsgemäß dadurch, daß in dem Hohlraum der Form von oben und/oder un¬ ten her im wesentlich vertikal ausgerichtete Nadel eingreifend angeordnet werden, die zurückziehbar sind, und die stirnseitig am angelegten Kern und/ oder der Matte von oben und/oder unten her zur An- läge gebracht werden, anschließend der Kunststoff eingespritzt wird und im teigigen Zustand die Na¬ deln aus dem Hohlraum zurückgezogen werden. Einer der wichtigsten Gedanken vorliegender Er¬ findung besteht darin, den vom Kunststoff zu um- schließenden Kern oder Matte innerhalb des Hohlrau¬ mes der Form in der späteren gewünschten Position zu fixieren, diese während des Einspritzens des Kunststoffes beizubehalten, um sie jedoch vor dem Aushärten also in noch teigigem Zustand zurückzu- ziehen. Durch die im Vergleich zu den Nadeln gro¬ ßen Fläche von Kern oder M^atte ist eine räumli- ehe Verschiebung bei zurückgezogenen Nadeln prak¬ tisch unmöglich. Andererseits werden die im Kunst¬ stoffmaterial durch die Nadeln hinterlassenen fei¬ nen Öffnungen aufgrund der Plasizität des Materi- als praktisch vollständig verschlossen. In wel¬ cher Position Kern oder Matte im Hohlraum der Form fixiert werden, ist im Rahmen der Erfindung grund¬ sätzlich beliebig. Auch ist nicht unbedingt erfor¬ derlich, daß die Nadeln von oben und gleichzeitig von unten her in die Form eingreifen. So erreichen beispielsweise von unten in den Hohlraum der Form eingreifenden Nadeln dann aus, wenn Kern oder Matte im zunächst noch flüssigen Kunststoff nach unten absinkt. Analog wird man bei einer Neigung zum Auf- schwimmen von der Oberseite in den Hohlraum ein¬ greifenden Nadeln anbringen müssen. Die Zahl der Nadeln sowie deren Abstand untereinander wird be¬ stimmt und ist abhängig von der Form und Gestalt des Hohlraumes. Das Gewicht von Kern oder Matte bestimmt neben der Anzahl der Nadeln auch deren jeweiligen Durchmesser um die erforderlichen Ab- stützungskräfte problemlos aufbringen zu können.This object is achieved, according to the invention, by engaging in the cavity of the mold from above and / or below, essentially vertically oriented needle, which are retractable, and which are attached to the front of the core and / or the mat from above and / or brought to the bottom, then the plastic is injected and the needles are withdrawn from the cavity in the pasty state. One of the most important ideas of the present invention is to fix the core or mat to be enclosed by the plastic within the cavity of the mold in the later desired position, to maintain this during the injection of the plastic, but in order to cure it before curing retract while still doughy. By gro¬ compared to the needles SEN area of core or M ^ atte is a spatial before displacement practically impossible when the needles are withdrawn. On the other hand, the fine openings left in the plastic material by the needles are practically completely closed due to the plasticity of the material. The position in which the core or mat is fixed in the cavity of the mold is basically arbitrary in the context of the invention. It is also not absolutely necessary for the needles to engage in the mold from above and simultaneously from below. For example, needles reaching into the cavity of the mold reach from below when the core or mat sinks downward in the initially still liquid plastic. Similarly, in the event of a tendency to float, needles need to be inserted from the top into the cavity. The number of needles and their spacing from one another is determined and depends on the shape and shape of the cavity. In addition to the number of needles, the weight of the core or mat also determines their respective diameters in order to be able to apply the necessary support forces without problems.
Die Art und Weise nach der die Nadeln ausgefahren und zurückgezogen werden, ist zunächst für die Re¬ alisierung der erfindungsgemäßen Idee unerheblich.The manner in which the needles are extended and retracted is initially irrelevant for the realization of the idea according to the invention.
Die Vorgehensweise ist so, daß zunächst die Form geöffnet, die, sofern vorhanden unteren Nadeln in den Hohlraum ausgefahren und der Kern oder die Mat¬ te aufgelegt werden. Dann wird die Form verschlos¬ sen und die oberen Nadeln, sofern vorhanden, legen sich von oben her mit ihrer Stirnseite am Kern oder der Matte an. Anschließend wird der Kunststoff in an sich bekannter Weise eingebracht, die Nadeln während des Aushärtens zurückgezogen, so daß sich mit erfolgter Aushärtung das Endprodukt aus der Form entnehmen läßt.The procedure is such that first the mold is opened, the lower needles, if present, are extended into the cavity and the core or mat is placed on top. Then the mold is closed and the upper needles, if present, rest with their end faces against the core or mat from above. The plastic is then introduced in a manner known per se, the needles withdrawn during curing, so that the finished product can be removed from the mold once it has hardened.
Die Vorteile des erfindungsgemäßen Verfahrens be- stehen darin, daß in einem einzigen Arbeitsvorgang eine von allen Seiten erfolgende Um antelung und Isolierung des Kernes erfolgt. Diese Kunststoff¬ hülle ist spurenfrei und enthält keine Stifte odgl . Das Ergebnis ist ein Produkt mit exakt po- sitionierten Kern oder Matte, allseitiger Umman¬ telung und einwandfreier Oberfläche.The advantages of the method according to the invention consist in the fact that the core is coated and insulated from all sides in a single operation. This plastic cover is free of traces and contains no pins or the like. The result is a product with a precisely positioned core or mat, all-round sheathing and a perfect surface.
Damit sich die nach dem Zurückziehen der Nadeln im Kunststoff hinterlassenen Öffnungen möglichst rasch wieder auffüllen, empfiehlt sich die Verwendung von Nadeln möglichst geringen Durchmessers. Ist ein selbständiger Verschluß der Öffnungen durch die zu geringe Fließfähigkeit des Kunststoffmaterials oder aufgrund des Materialschwundes nicht ohne weiteres . möglich, wird durch die Erfindung empfohlen, daß nach erfolgtem Rückziehen der Nadeln nochmals eine bestimmte Kunststoffmenge eingespritzt wird, also ein sog. Nachdruck erfolgt. Hierdurch wird einer¬ seits das fehlende Material zur Verfügung gestellt, daß in hochfließfähigem Zustand die im Kunststoff zurückgelassenen Öffnungen ohne weiteres ver¬ schließt.In order for the openings left in the plastic to fill up as quickly as possible after the needles have been withdrawn, the use of needles of the smallest possible diameter is recommended. An independent closure of the openings is not easy due to the insufficient flowability of the plastic material or due to the material shrinkage. possible, it is recommended by the invention that after the needles have been withdrawn, a certain amount of plastic is injected again, that is to say a so-called reprint. In this way, on the one hand, the missing material is made available that, in a highly flowable state, the openings left behind in the plastic easily close.
Für das Gelingen der erfindungsgemäßen Lehre ist entscheidend, daß die Nadeln nicht zu früh, also bei hochviskosem Kunststoff und auch nicht zu spät bei nahezu vollständiger Aushärtung zurückgezogen werden. Zur Ermittlung des günstigsten Zeitpunktes können empirisch Daten ermittelt werden, die an- geben, wann nach erfolgtem Spritzdruck die Nadeln zurückgezogen werden sollen. Als besonders vorteil- haft empfiehlt jedoch die Erfindung die Temperatur des Kunststoffes in der Form über einen Fühler zu erfassen, aus der sich dann ziemlich exakt der Verlauf des Aushärtevorganges verfolgen und able- sen läßt.It is crucial for the success of the teaching according to the invention that the needles are not withdrawn too early, that is to say in the case of highly viscous plastic, and not too late when the curing is almost complete. To determine the most favorable point in time, data can be determined empirically, which indicate when the needles should be withdrawn after the injection pressure has taken place. As a particularly advantageous However, the invention recommends that the temperature of the plastic be recorded in the mold by means of a sensor, from which the course of the curing process can then be followed and read quite exactly.
Unabhängig von dem bisher geschilderten Verfahren der Herstellung von mit Kernen oder Matten verse- henen Kunststofformteilen, das jedoch ohne weite¬ res auch in Ergänzung des bisher beschriebenen Herstellungsverfahrens anwendbar ist, wird ein Ver¬ fahren zum Auswerfen des fertigen, d.h. ausgehär¬ teten Formteiles aus der Form dadurch vorgeschla- gen, daß ebenfalls in den Hohlraum der Form von oben und/oder unten her Nadeln eingreifend ange¬ ordnet werden, die zurückziebar sind und das Form¬ teil nach dem Aushärten und öffnen der Form über die Nadeln auswirft. In an sich bekannter Wei- se wird mit Beendigung des Aushärteprozesses die in der Regel aus Schalen aufgebaute Form geöffnet und das anhaftende Formteil dadurch gelöst und ausgeworfen, das die bis zu diesem Augenblick noch in zurückgezogenem Zustand befindlichen Nadeln derart betätigt werden, daß sie ausfahren, das Kunststofformteil ablösen und bis zu einem ge¬ wissen Abstand von der Form abheben. Wie bereits erwähnt, ist dieses Verfahren zum Auswerfen des ausgehärteten Kunststofformteiles völlig unab- hängig von vorbeschriebenen Verfahren einsetz- und verwendbar. Ein entscheidender Vorzug be¬ steht jedoch darin, daß bei oben beschriebenen Verfahren zur Herstellung von Kunststofform¬ teilen mit posi ionsexakt eingebrachten Kernen oder Matten dieses Auswer verfahren zusätzlich und ohne irgendwelche bauliche Veränderungen vor- - 5 -Irrespective of the previously described method of producing plastic molded parts provided with cores or mats, which, however, can also be used in addition to the previously described production method, a method for ejecting the finished, ie cured, molded part is carried out proposed the mold in that needles are also arranged to engage in the cavity of the mold from above and / or below, which are retractable and eject the molded part after the hardening and opening of the mold via the needles. In a manner known per se, when the hardening process has ended, the mold, which is generally made up of shells, is opened and the adhering molded part is thereby loosened and ejected, so that the needles, which were still in a retracted state until then, are actuated in such a way that they extend. detach the plastic molding and lift it up to a certain distance from the mold. As already mentioned, this method for ejecting the hardened plastic molded part can be used and used completely independently of the previously described method. A decisive advantage, however, is that in the above-described processes for the production of molded plastic parts with cores or mats which are precisely inserted, this ejecting process proceeds additionally and without any structural changes. - 5 -
genommen werden kann. Die in dem Hohlraum der Form einschieb- und zurückziehbaren Nadeln sind für beide Verfahren gleichermaßen er orderlich.can be taken. The needles that can be inserted and withdrawn in the cavity of the mold are equally available for both processes.
Im folgenden wird eine Vorrichtung näher beschrie¬ ben, die sich zur Durchführung des vorgenannten Verfahrens in besonderer Weise eignet. Zunächst besteht sie in an sich bekannter Weise aus einer Form und einer für das Einbringen des Kunststof¬ fes benötigten Fülldüse. Neu ist, daß im wesent¬ lichen vertikal ausgerichteten Nadeln angeordnet sind, die in den Hohlraum der Form, der später vom Kunststoffmaterial beaufschlagt wird, von oben und/ oder unten her eingreifen und über Betätigungsorga¬ ne zurückziehbar sind. Der Bewegungsweg ist so be¬ messen, daß im ausgefahrenen Zustand die Nadeln bis zu einer gewissen Tiefe in den Hohlraum einragen; im zurückgezogenen Zustand hingegen verschwinden die Nadeln völlig in der Form, so daß der Hohlraum vollständig frei wird. Wie bereits erläutert, kann das Ausfahren der Nadeln zum Auswerfen des ausge¬ härteten Formteiles genutzt werden. Zum positions¬ exakten Fixieren von Kernen oder Matten bleiben die Nadeln solange ausgefahren, bis der eingebrachte Kunststoff aushärtet. Die Bewegung der Nadeln er¬ folgt über Betätigungsorgane, die von außen ge¬ steuert werden. Von den eigentlichen, die Bewegung der Nadeln vornehmenden Betätigungsorgane führen Zuleitungen nach außen.A device is described in more detail below which is particularly suitable for carrying out the aforementioned method. First of all, in a manner known per se, it consists of a mold and a filling nozzle required for introducing the plastic. What is new is that essentially vertically aligned needles are arranged which engage in the cavity of the mold, which will later be acted upon by the plastic material, from above and / or below and can be retracted via actuators. The path of movement is measured such that, when extended, the needles protrude into the cavity to a certain depth; in the retracted state, however, the needles disappear completely in the form, so that the cavity is completely free. As already explained, the extension of the needles can be used to eject the hardened molded part. For the position-exact fixing of cores or mats, the needles remain extended until the introduced plastic hardens. The needles are moved via actuators which are controlled from the outside. Leads lead to the outside from the actual actuators that move the needles.
Grundsätzlich steht im Rahmen der Erfindung die konkrete bauliche Ausgestaltung der Betätigungs¬ organe frei. Als besonders vorteilhaft wird je- doch die Verwendung hydraulischer oder pneuma¬ tischer Zylinder angesehen, von denen nach außen führende und an eine Pumpe über eine Steuerein¬ heit anschließbare Leitungen angeordnet sind. Die Nadel jeweils einer Seite (Ober-/Unterseite) kön¬ nen über ein und dieselbe Leitung gleichzeitig versorgt werden. Die Zylinder selbst sind ein¬ geformt und darin bewegen sich die Nadeln nach Art von Kolben und Kolbenstange. Von der der Na¬ del gegenüberliegenden Seite des Zylinders er¬ folgt die Beaufschlagung durch das hydraulische oder pneumatische Medium.In principle, the concrete structural design of the actuating members is free within the scope of the invention. However, the use of hydraulic or pneumatic cylinders, from which to the outside, is considered to be particularly advantageous leading lines and connected to a pump via a control unit are arranged. The needle on each side (top / bottom) can be supplied simultaneously via one and the same line. The cylinders themselves are molded and the needles move in the manner of pistons and piston rods. The hydraulic or pneumatic medium acts on the side of the cylinder opposite the needle.
Um die exakte Fixierung im Inneren des Hohlraumes insbesondere bei elastischen Kernen oder Matten zu erleichtern und eine wellenförmigen Verlauf zu vermeiden, ist von Vorteil, bei sowohl an Ober¬ ais auch Unterseite befindliche Nadeln diese paar¬ weise aneinander gegenüberliegend anzuordnen. Eine räumlich exakte Fixierung zwischen jedem Nadelpaar läßt sich dann vornehmen.In order to facilitate the exact fixing in the interior of the cavity, in particular in the case of elastic cores or mats, and to avoid a wave-shaped course, it is advantageous to arrange them in pairs opposite one another in the case of needles located on both the upper and lower sides. A spatially exact fixation between each pair of needles can then be carried out.
Weitere Einzelheiten, Merkmale und Vorteile der Erfindung lassen sich dem nachfolgenden Beschrei¬ bungsteil entnehmen, indem anhand der Zeichnung ein Ausführungsbeispiel der Erfindung näher erläu¬ tert wird. Sie zeigt in schematischer Darstellung einen Schnitt durch eine erfindungsgemäße Vorrich¬ tung.Further details, features and advantages of the invention can be found in the following descriptive part, in which an embodiment of the invention is explained in more detail with reference to the drawing. It shows a schematic representation of a section through a device according to the invention.
In an sich bekannter Weise weist die Form (1) eine Fülldüse (2) und einen im Inneren befindlichen, die Kontur des herzustellenden Formteils bestimmenden Hohlraum (3) auf. Durch die Form (1) verläuft in Höhe des Hohlraumes (3) eine die Herausnahme des fertigen Kunststofformteiles ermöglichende und senkrecht zur Zeichenebene verlaufende Schnittflä¬ che (4). Des weiteren verläuft von der FülldüseIn a manner known per se, the mold (1) has a filling nozzle (2) and an interior cavity (3) which determines the contour of the molded part to be produced. The shape (1) runs at the level of the cavity (3) and enables the removal of the finished plastic molded part Cutting surface (4) running perpendicular to the plane of the drawing. It also runs from the filling nozzle
(2) ein Kanal (5) zum Hohlraum (3). Vorrichtungen mit den bisher beschriebenen Merkmalen sind aus dem Stande der Technik bereits bekannt.(2) a channel (5) to the cavity (3). Devices with the features described so far are already known from the prior art.
Neu ist, sowohl an der Ober- als auch Unterseite des Hohlraumes (3) Nadeln (6, 7) im wesentlichen vertikal ausgerichtet so anzubringen, daß sie zu- mindest im ausgefahrenen Zustand in den HohlraumWhat is new is to attach needles (6, 7) on both the top and bottom of the cavity (3) essentially vertically so that they are at least in the extended state in the cavity
(3) eingreifen. Zur Verschiebung der Nadeln (6, 7) in axialer Richtung sind sie nach Art eines Kolbens bzw einer Kolbenstange in Zylindern (8, 9) geführt. Die Verschiebung wird dadurch bewirkt, daß die Zylinder (8, 9) in der Nadel (6, 7) gegenüberlie¬ genden Kammer mit einem hydraulischen und pneuma¬ tischen Medium über eine, sämtliche an der Obersei¬ te befindlichen Zylinder (8) versorgenden Zulei¬ tung (10) und einer weiteren, die unteren Zylinder (g) versorgenden Zuleitung (ll) in Verbindung ste¬ hen. Sie gehen aus von einer einen Über- oder Un¬ terdruck erzeugenden Pumpe (12) . Bei Oberdruck werden die Nadeln (6, 7) in den Hohlraum (3) ein¬ gefahren und bei Unterdruck zurückgezogen. Die Steuerung erfolgt in der Weise, daß bei ausge¬ fahrenen unteren Nadeln (7) und geöffneten Form (l) die Matte (13) aufgelegt wird, die anschlie¬ ßend zu verschließen ist und dann der Hohl¬ raum (3) über die Fülldüse (2) mit Kunststoff gefüllt wird. Bei noch teigigem Zustand des(3) intervene. To move the needles (6, 7) in the axial direction, they are guided in the manner of a piston or a piston rod in cylinders (8, 9). The displacement is brought about in that the cylinders (8, 9) in the needle (6, 7) opposite chamber with a hydraulic and pneumatic medium via a supply that supplies all the cylinders (8) located on the top side ¬ device (10) and a further, the lower cylinder (g) supply line (II) are connected. They are based on a pump (12) that generates an overpressure or underpressure. If the pressure is high, the needles (6, 7) are inserted into the cavity (3) and withdrawn if the pressure is negative. The control takes place in such a way that when the lower needles (7) are extended and the mold (1) is open, the mat (13) is placed on, which is then to be closed, and then the cavity (3) via the filling nozzle (2) is filled with plastic. When the dough is still in its
Materials werden die Nadeln (6, 7) vollständig zurückgezogen, anschließend evtl. zusätzliches Kunststoffmaterial nachgespritzt und die Aushär¬ tung abgewartet. Nach dem öffnen von Form (l) läßt sich das fertige Formteil durch Vorschie¬ ben der Nadeln (6) oder (7) problemlos auswerfen. Im Ergebnis erhält man eine Vorrichtung, die einerseits die exakte Positionierung von Kern oder Matten im Inneren von Kunststofformteilen und/oder das Auswerfen erlaubt. The needles (6, 7) are withdrawn completely, additional plastic material may then be injected and the curing awaited. After opening mold (1), the finished molded part can be easily ejected by pushing the needles (6) or (7) forward. The result is a device which, on the one hand, allows the exact positioning of the core or mats inside the molded plastic parts and / or the ejection.

Claims

P A T E N T A N S P R Ü C H E PATENT CLAIMS
1. Verfahren zum positionsexakten Einbringen von Kernen und/oder Matten in Kunststofformteile, d a d u r c h g e k e n n z e i c h n e t , daß in dem Hohlraum (3) der Form (1) von oben und/oder unten her im wesentlichen vertikal aus¬ gerichteten Nadeln (6, 7) eingreifend angeord¬ net werden, die zurückziehbar sind, und die stirn¬ seitig am eingelegten Kern und/oder der Matte (13) von oben und/oder unten her zur Anlage gebracht werden, anschließend der Kunststoff eingespritzt wird und im teigigen Zustand die Nadeln (6, 7) aus dem Hohlraum (3) zurückgezogen werden.1. A method for the exact introduction of cores and / or mats in plastic moldings, characterized in that in the cavity (3) of the mold (1) from above and / or below substantially vertically aligned needles (6, 7) engagingly arranged ¬ are retractable, and the end face against the inserted core and / or mat (13) from above and / or below, then the plastic is injected and the needles (6, 7) are withdrawn from the cavity (3).
2. Verfahren nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t , daß nach erfolgtem Zurückziehen der Nadeln (6, 7) nochmals Kunststoff eingespritzt wird (= Nachdruck).2. The method of claim 1, d a d u r c h g e k e n n z e i c h n e t that after retracting the needles (6, 7) plastic is injected again (= reprint).
3. Verfahren nach Anspruch 1 oder 2, d a ¬ d u r c h g e k e n n z e i c h n e t , daß der Aushärtungszustand über Temperaturfühler er- faßt wird.3. The method according to claim 1 or 2, that the curing state is determined by means of a temperature sensor.
4. Verfahren zum Auswerfen ausgehärteter Kunst- stofformteile aus der Form, d a d u r c h g e - k e n n z e i c h n e t , daß in dem Hohlraum (3) der Form (1) Nadeln (5,7) eingreifend angeordnet wer¬ den, die zurückziehbar sind und das Formteil nach dem Aushärten und öffnen der Form (1) über die Nadeln (6, 7) ausgeworfen wird.4. Process for ejecting hardened plastic molded parts from the mold, characterized in that in the cavity (3) the mold (1) engaging needles (5,7) are arranged, which are retractable and the molded part is ejected via the needles (6, 7) after curing and opening the mold (1).
5. Vorrichtung insbesondere zur Durchführung der Verfahren nach einem der Ansprüche 1 bis 4, mit einer Form (1) und einer Fülldüse (2), d a ¬ d u r c h g e k e n n z e i c h n e t , daß in den Hohlraum (3) der Form (1) von oben und/oder unten her im wesentlichen vertikal ausgerichtete Nadeln (6, 7) eingreifend angeordnet sind, die über von außen steuerbare Betätigungsorgane zu¬ rückziehbar sind.5. Device in particular for performing the method according to one of claims 1 to 4, with a mold (1) and a filling nozzle (2), since ¬ characterized in that in the cavity (3) of the mold (1) from above and / or essentially vertically aligned needles (6, 7) are arranged so as to engage, which can be withdrawn by means of actuators that can be controlled from the outside.
6. Vorrichtung nach Anspruch (5), d a d u r c h g e k e n n z e i c h n e t , daß die Betäti- gungsorgane pneumatische oer hydraulische Zylin¬ der (8, 9) sind.6. The device according to claim (5), d a d u r c h g e k e n n z e i c h n e t that the actuators are pneumatic or hydraulic Zylin¬ (8, 9).
7. Vorrichtung nach Anspruch (5) oder (6), g e k e n n z e i c h n e t d u r c h paarweise aneinander gegenüberliegend angeordnete Nadeln (6, 7). 7. The device according to claim (5) or (6), g e k e n n z e i c h n e t d u r c h needles (6, 7) arranged in pairs opposite one another.
PCT/DE1989/000306 1988-05-17 1989-05-13 Process for accurately positioning cores and/or mats in plastic mouldings WO1989011386A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19883816740 DE3816740A1 (en) 1988-05-17 1988-05-17 METHOD FOR EXACTLY POSITIONING CORES AND / OR MATS IN PLASTIC MOLDED PARTS
DEP3816740.9 1988-05-17

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DE102009029820A1 (en) * 2008-08-15 2010-02-18 Volkswagen Ag Injection molding component manufacturing method for automotive engineering, involves adjacently moving reinforcing inlay from pin of transferring device to pin of tool mold by stripping device that is attached to transferring device
WO2022031166A3 (en) * 2020-08-04 2022-03-31 Bambi Belt Holding B.V. Method of manufacturing a flexible sensor belt and a flexible sensor belt

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DE4041324A1 (en) * 1989-12-22 1991-06-27 Bosch Siemens Hausgeraete Plastic driving dog for washing machine drum and mfr. - has round steel bar insert held in tool by forks engaging in circumferential grooves and plastic is injected around part of bar
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WO2002081170A1 (en) * 2001-04-06 2002-10-17 Sherwood Services Ag Retractable overmolded insert retention apparatus
DE102009029820A1 (en) * 2008-08-15 2010-02-18 Volkswagen Ag Injection molding component manufacturing method for automotive engineering, involves adjacently moving reinforcing inlay from pin of transferring device to pin of tool mold by stripping device that is attached to transferring device
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WO2022031166A3 (en) * 2020-08-04 2022-03-31 Bambi Belt Holding B.V. Method of manufacturing a flexible sensor belt and a flexible sensor belt
NL2026206B1 (en) * 2020-08-04 2022-04-08 Bambi Belt Holding B V Method of manufacturing a flexible sensor belt, as well as a mould part, a casting arrangement and a flexible belt.

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