WO1989004240A1 - Device for manufacturing plastic molded parts with through holes - Google Patents

Device for manufacturing plastic molded parts with through holes Download PDF

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Publication number
WO1989004240A1
WO1989004240A1 PCT/EP1988/000983 EP8800983W WO8904240A1 WO 1989004240 A1 WO1989004240 A1 WO 1989004240A1 EP 8800983 W EP8800983 W EP 8800983W WO 8904240 A1 WO8904240 A1 WO 8904240A1
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WO
WIPO (PCT)
Prior art keywords
mold
sealing washer
wall
tool part
mandrel
Prior art date
Application number
PCT/EP1988/000983
Other languages
German (de)
French (fr)
Inventor
Konrad Walthart
Original Assignee
Pebra Gmbh Paul Braun
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 Pebra Gmbh Paul Braun filed Critical Pebra Gmbh Paul Braun
Publication of WO1989004240A1 publication Critical patent/WO1989004240A1/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
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/0033—Moulds or cores; Details thereof or accessories therefor constructed for making articles provided with holes
    • 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
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/0002—Condition, form or state of moulded material or of the material to be shaped monomers or prepolymers

Definitions

  • the invention relates to a device for producing molded plastic parts with through holes of the type specified in the preamble of claim 1.
  • reaction injection process for the production of plastic molded parts
  • two reaction components that are still liquid in the initial state such as polyether polyol and polyisocianate
  • the reaction mixture flows into the mold cavity of a mold consisting of at least two parts that can be separated from one another and reacts there to form a solid material, e.g. Polyurethane, from.
  • a mold core shaping fixed or movable cores (hereinafter referred to as mold cores) are built into the mold.
  • the mold cores are fitted into the opposite mold wall of the other tool half until they rest. An absolutely gap-free adaptation of the mold cores and readjustment is not possible in series operation.
  • the mold cores are usually foamed and burrs and so-called webs are formed. In order to remove these burrs and webs, additional work steps and possibly additional expensive tools are required.
  • the invention is therefore based on the object to improve the known device of the type mentioned in such a way that a burr-free production of the through holes is possible in the course of the production of the plastic molded parts.
  • the features specified in the characterizing part of claim 1 are proposed. Further advantageous refinements and developments of the invention result from the subclaims.
  • the invention is based on the idea that any gap formation must be avoided at the contact point of the mandrel against the second tool part.
  • an elastically flexible sealing washer is arranged in the wall of the second tool part in the area of the stop point of the mold core, into which the mold core penetrates from the mold cavity when the mold is closed.
  • the sealing washer is detachably arranged in a wall recess of the second mold.
  • the wall recess expediently has a depth corresponding to the thickness of the sealing washer and an edge contour adapted to the outline of the sealing washer.
  • the recess is advantageously provided with an undercut, the space of which is not or only partially filled by the sealing disk material when the sealing disk is not loaded. This free space is dimensioned at least in such a way that the material which is elastically displaced when the mandrel penetrates the sealing disk can penetrate into it.
  • the free broad side surface of the sealing washer is chosen to be somewhat larger than the free end surface of the mandrel.
  • the wide side surface of the sealing washer should be selected at least 1.2 times, preferably 1.4 to 1.8 times larger than the end face of the mandrel.
  • the depth of penetration of the mandrel into the sealing washer is expediently set to 0.1 to 0.3 mm.
  • the wall thickness of the sealing washer should be a multiple of the penetration depth in order to avoid excessive alternating loading of the sealing washer material and thus premature wear.
  • Polytetrafluoroethylene has proven to be particularly advantageous as a sealing material. This material is sufficiently resistant and detergent-resistant to the reaction mixture components and the mold.
  • the sealing washer on the end face of the mandrel in the sense of a kinematic reversal so that it is elastically deformed when it hits the wall of the second tool part, producing a gap-free system.
  • the arrangement of the sealing washer on the second tool part described above is preferable to the arrangement on the mold core.
  • the measures according to the invention have the advantage that through holes are produced without burrs in the course of the production of the plastic molded parts, so that additional operations and special tools for the subsequent deburring and removal of webs are saved.
  • Show it 1 shows a section through a molding tool with two molds.
  • Fig. 2 shows a detail of Fig. 1 in an enlarged view.
  • the mold shown schematically in the drawing consists of a plurality of parts which can be displaced and pivoted in the direction of arrows 10 and 11, the fixed lower part 12, and the upper part 14 composed of three parts 15, 16, 17, which delimit a mold cavity 18 in the closed state .
  • a mold core 22 is pressed into a bore 20, the conical tip 24 of which, when the tool is closed, passes through the mold cavity 18 and extends with its end face 26 to the opposite tool part 12 or 17.
  • the cone 24 penetrates with its end face 26 into an elastically flexible sealing disk 28 made of polytetrafluoroethylene, which is arranged in an undercut recess 30 of the tool part 12 or 17 concerned.
  • the mold is closed by tool parts 12, 14 (FIGS. 1 and 2) by a not shown
  • reaction mixture 32 thereby arrives in the mold cavity 18 and spreads there during the relatively short firing time. The only places left out are those where the mold cores 22 penetrate the mold cavity 18 with their cone 24 and lie tight against the sealing disk 28.
  • the reaction mixture 32 has hardened, we start with that the three parts 15, 16, 17 existing upper part 14 lifted in the direction of arrows 10 from the lower part 12. The tool part 17 is then folded away from the tool part 16 in the direction of the arrow 11, so that the hardened molded part is exposed in the region of the tool parts 15, 16 and can be removed from there.
  • the through holes 34 produced by the mold cores 22 in the molded part 32 are free of burrs and therefore do not need to be reworked.

Abstract

In a device for manufacturing plastic molded parts, at least two reaction components in a liquid state are mixed to form a reaction mixture injected into a mold nest (18) of a molding tool consisting of at least two detachable parts (12, 14) and cured to form the molded part (32). At least one mold core (22) for producing a through hole (34) in the molded part (32) and which penetrates the mold nest (18) when the molding tool is closed is arranged in the tool part (14). A resilient sealing washer (28) is arranged in the wall of the second tool part (12) in the region of the stop position of the mold core (22), into which it penetrates when the molding tool is closed. The through holes so formed are free of mold marks, which dispenses with the need for additional work cycles and special tools for subsequent removal of mold marks.

Description

VORRICHTUNG ZUR HERSTELLUNG VON UNSTSTOFF-FORMTE ILEN DEVICE FOR PRODUCING PLASTIC-SHAPED ILEN
MIT DURCHGANGSLÖCHERNWITH THROUGH HOLES
Beschreibungdescription
Die Erfindung betrifft eine Vorrichtung zur Herstellung von Kunststoff-Formteilen mit Durchgangslöchern der im Oberbegriff des Anspruchs 1 angegebenen Gattung.The invention relates to a device for producing molded plastic parts with through holes of the type specified in the preamble of claim 1.
Bei dem sogenannten Reaktions-Injektions-Verfahren zur Herstellung von Kunststoff-Formteilen werden zwei im Ausgangszustand noch flüssige Reaktionskomponenten, wie Polyetherpolyol und Polyisocianat in einem Mischkopf zu einem Reaktionsgemisch vereinigt. Vom Mischkopf strömt das Reaktionsgemisch in das Formnest eines aus mindestens zwei voneinander lösbaren Teilen bestehenden Formwerkzeugs und reagiert dort zu einem festen Werkstoff, z.B. Polyurethan, aus. Für die Erzeugung von Durchgangslöchern in den Kunststoff-Formteilen werden formgebende feste oder bewegliche Kerne (nachfolgend Formkerne genannt) in das Formwerkzeug eingebaut. Die Formkerne werden bis zur Anlage an die gegenüberliegende Formwand der anderen Werkzeughälfte eingepaßt. Ein absolut spaltfreies Anpassen der Formkerne und Nachjustieren ist jedoch im Serienbetrieb nicht möglich. Da andererseits das eingespritzte Reaktionsgemisch aufgrund seiner niedrigen Viskosität selbst kleinste Spalte füllt, kommt es meist zum Hinterschäumen der Formkerne und zur Ausbildung von Graten und sogenannten Schwimmhäuten. Um diese Grate und Schwimmhäute zu entfernen, sind zusätzliche Arbeitsgänge und gegebenenfalls zusätzliche teure Werkzeuge erf order lieh.In the so-called reaction injection process for the production of plastic molded parts, two reaction components that are still liquid in the initial state, such as polyether polyol and polyisocianate, are combined in a mixing head to form a reaction mixture. From the mixing head, the reaction mixture flows into the mold cavity of a mold consisting of at least two parts that can be separated from one another and reacts there to form a solid material, e.g. Polyurethane, from. In order to create through holes in the plastic molded parts, shaping fixed or movable cores (hereinafter referred to as mold cores) are built into the mold. The mold cores are fitted into the opposite mold wall of the other tool half until they rest. An absolutely gap-free adaptation of the mold cores and readjustment is not possible in series operation. On the other hand, since the injected reaction mixture fills even the smallest gaps due to its low viscosity, the mold cores are usually foamed and burrs and so-called webs are formed. In order to remove these burrs and webs, additional work steps and possibly additional expensive tools are required.
Der Erfindung liegt daher die Aufgabe zugrunde, die bekannte Vorrichtung der eingangs angegebenen Art dahingehend zu verbessern, daß eine gratfreie Erzeugung der Durchgangslöcher im Zuge der Herstellung der Kunststoff-Formteile möglich ist. Zur Lösung dieser Aufgabe werden die im kennzeichnenden Teil des Anspruchs 1 angegebenen Merkmale vorgeschlagen. Weitere vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen.The invention is therefore based on the object to improve the known device of the type mentioned in such a way that a burr-free production of the through holes is possible in the course of the production of the plastic molded parts. To achieve this object, the features specified in the characterizing part of claim 1 are proposed. Further advantageous refinements and developments of the invention result from the subclaims.
Die Erfindung geht von dem Gedanken aus, daß an der Anlagestelle des Formkerns gegen das zweite Werkzeugteil jegliche Spaltbildung vermieden werden muß. Um dies zu erreichen, ist erfindungsgemäß in der Wand des zweiten Werkzeugteils im Bereich der Anschlagstelle des Formkerns eine elastisch nachgiebige Dichtseheibe angeordnet, in die der Formkern bei geschlossenem Formwerkzeug vom Formnest her eindringt.The invention is based on the idea that any gap formation must be avoided at the contact point of the mandrel against the second tool part. To achieve this, according to the invention an elastically flexible sealing washer is arranged in the wall of the second tool part in the area of the stop point of the mold core, into which the mold core penetrates from the mold cavity when the mold is closed.
Gemäß einer bevorzugten Ausgestaltung der Erfindung ist die Dichtscheibe in einer Wandvertiefung des zweiten Formwerkzeugs tösbar angeordnet. Die Wandvertiefung weist hierzu zweckmäßig eine der Dicke der Dichtscheibe entsprechende Tiefe sowie eine dem Umriß der Dichtscheibe angepaßte Randkontur auf. Vorteilhafterweise ist die Vertiefung mit einer Hinterschneidung versehen, deren Raum im unbelasteten Zustand der Dichtscheibe nicht oder nur teilweise vom Dichtscheibenmaterial ausgefüllt ist. Dieser freie Raum ist mindestens so bemessen, daß das beim Eindringen des Formkerns in die Dichtscheibe elastisch verdrängte Material in ihn eindringen kann. Um die für die elastische Verformung notwendige Materialverdrängung aufgrund der Querkontraktion weiter zu verbessern, wird die freie Breitseitenfläche der Dichtscheibe etwas größer als die freie Stirnfläche des Formkerns gewählt. Um andererseits ein zu starkes Ausquellen neben dem Formkern zu vermeiden, sollte die Breitseitenflache der Dichtscheibe um mindestens das 1,2-fache, vorzugsweise um das 1,4- bis 1,8-fache größer als die Stirnfläche des Formkerns gewählt werden. Die Eindringtiefe des Formkerns in die Dichtscheibe wird zweckmäßig auf 0,1 bis 0,3 mm eingestellt. Die Wandstärke der Dichtscheibe sollte ein Mehrfaches der Eindringtiefe betragen, um eine zu starke Wechselbelastung des DichtScheibenmaterials und damit einen frühzeitigen Verschleiß zu vermeiden.According to a preferred embodiment of the invention, the sealing washer is detachably arranged in a wall recess of the second mold. For this purpose, the wall recess expediently has a depth corresponding to the thickness of the sealing washer and an edge contour adapted to the outline of the sealing washer. The recess is advantageously provided with an undercut, the space of which is not or only partially filled by the sealing disk material when the sealing disk is not loaded. This free space is dimensioned at least in such a way that the material which is elastically displaced when the mandrel penetrates the sealing disk can penetrate into it. In order to further improve the material displacement necessary for the elastic deformation due to the transverse contraction, the free broad side surface of the sealing washer is chosen to be somewhat larger than the free end surface of the mandrel. On the other hand, to avoid excessive swelling next to the mandrel, the wide side surface of the sealing washer should be selected at least 1.2 times, preferably 1.4 to 1.8 times larger than the end face of the mandrel. The depth of penetration of the mandrel into the sealing washer is expediently set to 0.1 to 0.3 mm. The wall thickness of the sealing washer should be a multiple of the penetration depth in order to avoid excessive alternating loading of the sealing washer material and thus premature wear.
Als besonders vorteilhaft hat sich Polytetrafluorethylen als Dichtmaterial erwiesen. Dieser Werkstoff ist ausreichend widerstandsfähig und gegenüber den Reaktionsgemischkomponenten und dem Formwerkzeug reinigungsmittelresistent.Polytetrafluoroethylene has proven to be particularly advantageous as a sealing material. This material is sufficiently resistant and detergent-resistant to the reaction mixture components and the mold.
Grundsätzlich ist es möglich, die Dichtscheibe im Sinne einer kinematischen Umkehrung auch an der Stirnfläche des Formkerns so anzuordnen, daß sie beim Auftreffen auf die Wand des zweiten Werkzeugteils unter Erzeugung einer spaltfreien Anlage elastisch verformt wird. Die oben beschriebene Anordnung der Dichtscheibe am zweiten Werkzeugteil ist der Anordnung am Formkern jedoch vorzuziehen.In principle, it is possible to arrange the sealing washer on the end face of the mandrel in the sense of a kinematic reversal so that it is elastically deformed when it hits the wall of the second tool part, producing a gap-free system. However, the arrangement of the sealing washer on the second tool part described above is preferable to the arrangement on the mold core.
Die erfindungsgemäßen Maßnahmen haben den Vorteil, daß bereits im Zuge der Herstellung der Kunststoff-Formteile gratfrei Durchgangslöcher erzeugt werden, so daß zusätzliche Arbeitsgänge und Spezialwerkzeuge für das nachträgliche Entgraten und das Entfernen von Schwimmhäuten eingespart werden.The measures according to the invention have the advantage that through holes are produced without burrs in the course of the production of the plastic molded parts, so that additional operations and special tools for the subsequent deburring and removal of webs are saved.
Im folgenden wird die Erfindung anhand des in der Zeichnung in schematischer Weise dargestellten Ausführungsbeispiels näher erläutert. Es zeigen Fig. 1 einen Schnitt durch ein Formwerkzeug mit zwei Formke rnen;The invention is explained in more detail below on the basis of the exemplary embodiment shown schematically in the drawing. Show it 1 shows a section through a molding tool with two molds.
Fig. 2 einen Ausschnitt aus Fig. 1 in vergrößerter Darstellung.Fig. 2 shows a detail of Fig. 1 in an enlarged view.
Das in der Zeichnung schematisch dargestellte Formwerkzeug besteht aus mehreren in Richtung der Pfeile 10 und 11 gegeneinander verschiebbaren und verschwenkbaren Teilen, dem feststehenden Unterteil 12, und dem aus drei Teilen 15,16,17 zusammengesetzten Oberteil 14, die in geschlossenem Zustand ein Formnest 18 begrenzen. In den Werkzeugteilen 15 und 16 des Oberteils 14 ist in eine Bohrung 20 jeweils ein Formkern 22 eingepreßt, dessen konische Spitze 24 in geschlossenem Zustand des Werkzeugs das Formnest 18 durchgreift und mit seiner Stirnseite 26 bis zum gegenüberliegenden Werkzeugteil 12 bzw. 17 reicht. Dort dringt der Konus 24 mit seiner Stirnfläche 26 in eine elastisch nachgiebige Dichtscheibe 28 aus Polytetrafluorethylen ein, die in einer hinterschnittenen Vertiefung 30 des betreffenden Werkzeugteils 12 bzw. 17 angeordnet ist.The mold shown schematically in the drawing consists of a plurality of parts which can be displaced and pivoted in the direction of arrows 10 and 11, the fixed lower part 12, and the upper part 14 composed of three parts 15, 16, 17, which delimit a mold cavity 18 in the closed state . In the tool parts 15 and 16 of the upper part 14, a mold core 22 is pressed into a bore 20, the conical tip 24 of which, when the tool is closed, passes through the mold cavity 18 and extends with its end face 26 to the opposite tool part 12 or 17. There the cone 24 penetrates with its end face 26 into an elastically flexible sealing disk 28 made of polytetrafluoroethylene, which is arranged in an undercut recess 30 of the tool part 12 or 17 concerned.
Das Formwerkzeug wird bei geschlossenen Werkzeugteilen 12,14 (Fig. 1 und 2) durch einen nicht dargestelltenThe mold is closed by tool parts 12, 14 (FIGS. 1 and 2) by a not shown
Mischkopf mit einem aus zwei Reaktionskomponenten, wiePolyetherpolyol und Polyisocianat, bestehenden Reaktionsgemisch in flüssigem Zustand beaufschlagt. Das Reaktionsgemisch 32 gelangt dabei in das Formnest 18 und breitet sich dort während der relativ kurzen Schußzeit aus. Ausgespart bleiben lediglich die Stellen an denen die Formkerne 22 mit ihrem Konus 24 das Formnest 18 durchdringen und dicht gegen die Dichtscheibe 28 anliegen. Nach dem Aushärten des Reaktionsgemischs 32 wir zunächst das aus den drei Teilen 15,16,17 bestehende Oberteil 14 in Richtung der Pfeile 10 vom Unterteil 12 abgehoben. Anschließend wird das Werkzeugteil 17 in Richtung des Pfeils 11 vom Werkzeugteil 16 weggeklappt, so daß das ausgehärtete Formteil im Bereich der Werkzeugteile 15,16 freiliegt und von dort entnommen werden kann. Die durch die Formkerne 22 erzeugten Durchgangslöcher 34 im Formteil 32 sind gratfrei und brauchen daher nicht mehr nachbearbeitet zu werden. Mixing head with a reaction mixture consisting of two reaction components, such as polyether polyol and polyisocianate, applied in the liquid state. The reaction mixture 32 thereby arrives in the mold cavity 18 and spreads there during the relatively short firing time. The only places left out are those where the mold cores 22 penetrate the mold cavity 18 with their cone 24 and lie tight against the sealing disk 28. After the reaction mixture 32 has hardened, we start with that the three parts 15, 16, 17 existing upper part 14 lifted in the direction of arrows 10 from the lower part 12. The tool part 17 is then folded away from the tool part 16 in the direction of the arrow 11, so that the hardened molded part is exposed in the region of the tool parts 15, 16 and can be removed from there. The through holes 34 produced by the mold cores 22 in the molded part 32 are free of burrs and therefore do not need to be reworked.

Claims

Patentansprüche Claims
1. Vorrichtung zur Herstellung von Kunststoff-Formteilen, in welcher mindestens zwei Reaktionskomponenten in flüssigem Zustand unter Bildung eines Reaktionsgemisches mischbar und in ein Formnest eines aus mindestens zwei voneinander lösbaren Teilen bestehenden Formwerkzeugs einspritzbar und dort unter Bildung des Formteils aushärtbar sind, und in welcher in einem ersten Werkzeugteil mindestens ein das Formnest in geschlossenem Zustand des Formwerkzeugs durchdringender, gegen die Wand eines zweiten Werkzeugteils anschlagender Formkern zur Erzeugung eines Durchgangsloches im Formteil angeordnet ist, dadurch gekennzeichnet, daß in der Wand des zweiten Werkzeugteils (12,17) im Bereich der Anschlagstelle des Formkerns (22) eine elastisch nachgiebige Dichtscheibe (28) angeordnet ist, in die der Formkern (22) bei geschlossenem Formwerkzeug vom Formnest (18) her eindringt.1.Device for the production of plastic molded parts, in which at least two reaction components are miscible in the liquid state to form a reaction mixture and can be injected into a mold cavity of a mold consisting of at least two parts which can be separated from one another and can be cured there to form the molded part, and in which a first tool part has at least one mold core penetrating the mold cavity in the closed state of the mold and abutting against the wall of a second tool part to produce a through hole in the mold part, characterized in that in the wall of the second tool part (12, 17) in the area of the stop point of the mold core (22) an elastically flexible sealing disc (28) is arranged, into which the mold core (22) penetrates from the mold cavity (18) when the mold is closed.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Dichtscheibe (28) in einer Wandvertiefung (30) des zweiten Formwerkzeugs (12,17) lösbar angeordnet ist, und daß die Vertiefung (30) eine der Dicke der Dichtscheibe (28) entsprechende Tiefe sowie eine dem Umriß der Dichtscheibe (28) angepaßte Randkontur aufweist. 2. Device according to claim 1, characterized in that the sealing washer (28) in a wall recess (30) of the second mold (12, 17) is detachably arranged, and that the recess (30) corresponding to the thickness of the sealing washer (28) Depth and an edge contour adapted to the outline of the sealing washer (28).
3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Vertiefung (30) eine Hinterschneidung (31) aufweist, deren Raum im unbelasteten Zustand der Dichtscheibe (28) nicht oder nur teilweise vom Dichtscheibenmaterial ausgefüllt ist.3. Apparatus according to claim 1 or 2, characterized in that the recess (30) has an undercut (31), the space in the unloaded state of the sealing washer (28) is not or only partially filled by the sealing washer material.
4. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die freie Breitseitenfläche der Dichtscheibe größer als die freie Stirnfläche (26) des Formkerns (22) ist.4. Device according to one of claims 1 to 3, characterized in that the free broad side surface of the sealing washer is larger than the free end face (26) of the mandrel (22).
5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß die freie Breitseitenfläche der Dichtscheibe um mindestens das 1,2-fache, vorzugsweise um das 1,4- bis 1,8-fache größer als die Stirnfläche des Formkerns ist.5. The device according to claim 4, characterized in that the free broad side surface of the sealing washer is at least 1.2 times, preferably by 1.4 to 1.8 times larger than the end face of the mandrel.
6. Vorrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Dichtscheibe aus Polytetrafluorethylen besteht.6. Device according to one of claims 1 to 5, characterized in that the sealing disc consists of polytetrafluoroethylene.
7. Vorrichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Eindringtiefe des Formkerns in die Dichtscheibe 0,1 bis 0,3 mm beträgt.7. Device according to one of claims 1 to 6, characterized in that the depth of penetration of the mandrel in the sealing washer is 0.1 to 0.3 mm.
8. Vorrichtung nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die Wandstärke der Dichtscheibe ein Mehrfaches der Eindringtiefe des Formkerns beträgt. 8. Device according to one of claims 1 to 7, characterized in that the wall thickness of the sealing washer is a multiple of the depth of penetration of the mandrel.
9. Vorrichtung zur Herstellung von Kunststoff-Formteilen, in welcher mindestens zwei Reaktionskomponenten in flüssigem Zustand unter Bildung eines Reaktionsgemisches mischbar und in ein Formnest eines aus mindestens zwei voneinander lösbaren Teilen bestehenden Formwerkzeugs einspritzbar und dort unter Bildung des Formteils aushärtbar sind, und in welcher in einem ersten Werkzeugteil mindestens ein das Formnest in geschlossenem Zustand des Formwerkzeugs durchdringender, gegen die Wand eines zweiten Werkzeugteils anschlagender Formkern zur Erzeugung eines Durchgangsloches im Formteil angeordnet ist, dadurch gekennzeichnet, daß auf der Stirnfläche (26) des Formkerns (22) eine elastisch nachgiebige Dichtscheibe angeordnet ist und daß der Formkern (28) bei geschlossenem Formwerkzeug unter elastischer Verformung der Dichtscheibe gegen die Wand des zweiten Werkzeugteils anschlägt. 9.Apparatus for the production of plastic molded parts, in which at least two reaction components are miscible in the liquid state to form a reaction mixture and can be injected into a mold cavity of a mold consisting of at least two parts which can be separated from one another and can be cured there to form the molded part, and in which a first tool part has at least one mold core penetrating the mold cavity in the closed state of the mold and abutting against the wall of a second tool part to produce a through hole in the mold part, characterized in that an elastically flexible sealing washer is provided on the end face (26) of the mold core (22) is arranged and that the mold core (28) abuts against the wall of the second tool part when the mold is closed with elastic deformation of the sealing washer.
PCT/EP1988/000983 1987-11-06 1988-10-29 Device for manufacturing plastic molded parts with through holes WO1989004240A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP3737668.3 1987-11-06
DE19873737668 DE3737668A1 (en) 1987-11-06 1987-11-06 DEVICE FOR MANUFACTURING PLASTIC MOLDED PARTS WITH THROUGH HOLES

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EP (1) EP0390802A1 (en)
DE (1) DE3737668A1 (en)
WO (1) WO1989004240A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1003037C2 (en) * 1996-05-06 1997-11-07 Wavin Trepak B V Injection moulded double walled plastic container for bottle crate
EP1344619A1 (en) * 2002-03-14 2003-09-17 Artilat Naamloze Vennootschap Mould for manufacturing a mattress out of foam and foam mattress made with it
BE1014704A3 (en) * 2002-03-14 2004-03-02 Artilat Nv Die for producing a mattress of foam and thus manufactured foam mattress.

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EP0390802A1 (en) 1990-10-10
DE3737668A1 (en) 1989-05-18

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