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WO1999054111A1 - Injection moulding machine - Google Patents

Injection moulding machine Download PDF

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Publication number
WO1999054111A1
WO1999054111A1 PCT/EP1999/002404 EP9902404W WO9954111A1 WO 1999054111 A1 WO1999054111 A1 WO 1999054111A1 EP 9902404 W EP9902404 W EP 9902404W WO 9954111 A1 WO9954111 A1 WO 9954111A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston
connecting channels
cylinder
mould
platen
Prior art date
Application number
PCT/EP1999/002404
Other languages
German (de)
French (fr)
Inventor
Martin Derks
Original Assignee
Krauss-Maffei Kunststofftechnik Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Krauss-Maffei Kunststofftechnik Gmbh filed Critical Krauss-Maffei Kunststofftechnik Gmbh
Priority to JP55239199A priority Critical patent/JP2002505628A/en
Priority to EP99920617A priority patent/EP0996528A1/en
Priority to CA002294926A priority patent/CA2294926A1/en
Publication of WO1999054111A1 publication Critical patent/WO1999054111A1/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
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/64—Mould opening, closing or clamping devices
    • B29C45/67—Mould opening, closing or clamping devices hydraulic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/64—Mould opening, closing or clamping devices
    • B29C45/67—Mould opening, closing or clamping devices hydraulic
    • B29C45/6764—Mould opening, closing or clamping devices hydraulic using hydraulically connectable chambers of the clamping cylinder during the mould opening and closing movement
    • B29C45/6771—Mould opening, closing or clamping devices hydraulic using hydraulically connectable chambers of the clamping cylinder during the mould opening and closing movement the connection being provided within the clamping cylinder

Definitions

  • the invention relates to a method for producing plastic parts according to the preamble of claim 1 and an apparatus for performing the method.
  • a device of this type is known from DE 43 44 340 C2, which shows a so-called two-plate injection molding machine, in which the closing cylinder spaces are hydraulically connected to one another by connecting channels.
  • this locking system obeys the basic physical principle of the hydraulic scale. This ensures that all spars are exposed to the same load. Even with asymmetrical distribution of the cavities and a correspondingly asymmetrical mold driving force, the locking force is always evenly distributed over all bars, but in the areas of the tool where there is little or no mold driving force, the tool is compressed and in the areas where if the mold force develops, the locking force is reduced accordingly.
  • this can affect the quality of the molded part and, on the other hand, the parting surfaces of the two molds are exposed to increased wear, particularly in cases where the closing forces have to be increased overall in order to compensate for the inadequate locking force in some areas, which increases the other areas of the tool parting surfaces increased the contact pressure to a considerable extent.
  • the invention is therefore based on the object of improving an injection molding machine of the type specified so that with asymmetrical trisch acting mold buoyancy forces, the locking force on the tool parting surfaces can be kept in a largely uniform distribution.
  • the invention is based on the knowledge that the hydraulic piston-cylinder units, which are located in the area where the mold driving force predominantly acts, form a more rigid functional unit by shutting off the connection to the other piston-cylinder units, so that in the associated area Tool parting surface less loss of locking force must be accepted.
  • the invention is also preferably applicable to so-called two-platen injection molding machines, in which the pistons of the piston-cylinder units which generate the closing pressure are components of the spars of the injection molding machine.
  • the invention is explained below with reference to an embodiment shown in the drawing. Show it:
  • Fig. 1 shows a schematic representation of the section through a two-plate injection molding machine according to section line I-I in Fig. 2 and
  • FIG. 2 shows the sectional view along the section line II-II in FIG. 1.
  • FIG. 1 and 2 show a so-called two-platen injection molding machine, in which a first tool half 1 is fixed on a fixed mold mounting plate 2 and a second tool half 3 on a movable mold mounting plate 4.
  • Piston column units 5, 6, 7 and 8 are fastened in the movable platen 4, which pass through the fixed platen 2 and are reversibly guided in piston-cylinder units 9, 10 11 and 12.
  • the pistons 13, 14, 15 and 16 of the piston-column units 5-8 divide the cylinders of the piston-cylinder units 9-12 into cylinder-side cylinder spaces 17, 18, 19 and 20 and into cylinder-side cylinder spaces 21, 22, 23 and 24.
  • the closing-side cylinder spaces 17-20 are connected to one another by connecting channels 25, 26 and 27.
  • the connecting channels 25, 26 and 27 are shown in addition to the drawing in the manner of a hydraulic circuit diagram with 4/2-way valves 28, 29 and 30, which represent the shut-off devices with which the connecting channels 25, 26 and 27 can be switched either continuously (shown display position a) or locked (switch position b).
  • the piston column units 5 and 8 are provided with hydraulic supply lines 28, via which the hydraulic pressure medium into the closing-side cylinder spaces 17 to 20 can be introduced, the pressure medium also being conducted via the connecting channels 25, 26 and 27.
  • the piston-column units 7 and 9 are penetrated by overdrive pistons 32 and 33, which are supported on the piston-cylinder unit 10, 11 firmly connected to the fixed platen 2 and are reversibly guided in cylinder chambers 34 formed within the piston-column unit 6 and 7.
  • the pressure medium supply for the overdrive pistons 32 and 33 is not shown in detail.
  • the two tools 1 and 3 include a mold cavity 36 which is arranged asymmetrically with respect to the machine axis 35 and via which, after being filled with plastic melt under pressure, the mold driving forces FK are generated, which counteract the closing forces SK which are caused by the action of the annular piston surfaces 13 '. , 14 '15' and 16 'with hydraulic pressure medium.
  • the movable mold clamping plate 4 which is initially in the open position (not shown), is brought into the closed position shown by introducing pressure medium into the closing-side cylinder spaces 17-20, in which the two separating surfaces 37 and 38 of the two tool halves 1 and 3 are aligned with that of the pistons 13-16 generated closing force SK are pressed against each other.
  • This closing force SK counteracts the mold driving force FK at the separating surfaces 37 and 38, as a result of which the separating surfaces in the eccentric or asynchronous area, where the molding card vity 36 is located, relieved and in the opposite area with respect to the machine axis 35 in addition to the prevailing closing force still be loaded accordingly.
  • the connecting channels 25, 26, 27 after reaching the closing pressure and before pressurizing the mold cavity 35 with plastic melt by means of the 4/2-way valves 29, 30 and 31 by switching to the switching position b (not shown) blocked, which counteracts an excessive reduction of the locking forces in the area of the asynchronously occurring mold driving forces and an overloading of the areas of the parting surfaces which are opposite the point of application of the asynchronous mold driving force with respect to the machine axis 35.

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

Abstract

The invention relates to a two-platen injection moulding machine, comprising a fixed platen (2) supporting one mould half (1) and a moving platen (4) supporting the other mould half (3). Plunger-column units (5-8) which pass through the fixed platen (2) and which are displaceably guided therein in plunger-cylinder units (9-12) are attached. The connecting channels (25-27) between the plunger-column units (5-8) are blocked off after the two mould halves have been closed and before the plastic melt is injected into the mould cavity (36) encompassed by the mould halves in order to keep the locking force essentially evenly distributed across the mould parting surface in the presence of the asymmetrically effective mould opening forces.

Description

Spri tzgi eßmaschi neSpri tzgi eating machine
Die Erfindung betrifft ein Verfahren zur Herstellung von Kunststoffteilen nach dem Oberbegriff des Patentanspruchs 1 sowie eine Vorrichtung zur Durchführung des Verfahrens.The invention relates to a method for producing plastic parts according to the preamble of claim 1 and an apparatus for performing the method.
Eine Vorrichtung dieser Art ist aus der DE 43 44 340 C2 bekannt, die eine sogenannte Zweiplatten-Spritzgießmaschine zeigt, bei der die schl i eßsei ti gen Zylinderräume durch Verbindungskanäle hydraulisch miteinander verbunden sind. Bei symmetrischer Lage der Kavi täten zur Spritzachse und aufgrund der gleichen Kolbenflächen gehorcht dieses Schließsystem dem physikalischen Grundprinzip der hydraulischen Waage. Damit ist gewährleistet, daß sämtliche Holme einer gleichen Belastung ausgesetzt sind. Auch bei asymmetrischer Verteilung der Kavi täten und entsprechend asymmetrisch wirkender Formauftreibkraft bleibt die Zuhaltekraft über alle Holme stets gleichmäßig verteilt, in den Bereichen des Werkzeugs jedoch, in denen keine oder nur eine geringe Formauftreibkraft herrscht, wird das Werkzeug gestaucht und in den Bereichen, in denen sich die Formauftreibkraft entfaltet, ist die Zuhaltekraft entsprechend reduziert. Damit kann zum einen die Qualität des Formteils beeinträchtigt werden und zum anderen sind die Trennflächen der beiden Werkzeugh lften einem erhöhten Verschleiß ausgesetzt, insbesondere in den Fällen, in denen zur Kompensation der in Teilbereichen ungenügenden Zuhaltekraft die Schließkräfte insgesamt erhöht werden müssen, wodurch sich in den übrigen Bereichen der Werkzeug-Trennflachen die Anpreßkraft in erheblichem Maß erhöht.A device of this type is known from DE 43 44 340 C2, which shows a so-called two-plate injection molding machine, in which the closing cylinder spaces are hydraulically connected to one another by connecting channels. With a symmetrical position of the cavities to the spray axis and due to the same piston surfaces, this locking system obeys the basic physical principle of the hydraulic scale. This ensures that all spars are exposed to the same load. Even with asymmetrical distribution of the cavities and a correspondingly asymmetrical mold driving force, the locking force is always evenly distributed over all bars, but in the areas of the tool where there is little or no mold driving force, the tool is compressed and in the areas where if the mold force develops, the locking force is reduced accordingly. On the one hand, this can affect the quality of the molded part and, on the other hand, the parting surfaces of the two molds are exposed to increased wear, particularly in cases where the closing forces have to be increased overall in order to compensate for the inadequate locking force in some areas, which increases the other areas of the tool parting surfaces increased the contact pressure to a considerable extent.
Der Erfindung liegt daher die Aufgabe zugrunde, eine Spritzgießmaschine der angegebenen Art so zu verbessern, daß bei asymme- trisch wirkenden Formauftriebskräften die Zuhaltekraft an den Werkzeugtrennflächen in weitgehend gleichmäßiger Verteilung gehalten werden kann.The invention is therefore based on the object of improving an injection molding machine of the type specified so that with asymmetrical trisch acting mold buoyancy forces, the locking force on the tool parting surfaces can be kept in a largely uniform distribution.
Diese Aufgabe wird durch ein Verfahren mit den Merkmalen des Patentanspruchs 1 und durch eine Vorrichtung mit den Merkmalen des Patentanspruchs 2 gelöst.This object is achieved by a method with the features of claim 1 and by a device with the features of claim 2.
Die Erfindung geht dabei von der Erkenntnis aus, daß die hydraulischen Kolben-Zylindereinheiten, die in dem Bereich liegen, wo die Formauftreibkraft überwiegend wirkt, durch die Absperrung der Verbindung zu den übrigen Kolben-Zylindereinheiten eine steifere Funktionseinheit bilden, wodurch in dem zugehörigen Bereich der Werkzeugtrennfläche weniger Verlust an Zuhaltekraft in Kauf genommen werden muß.The invention is based on the knowledge that the hydraulic piston-cylinder units, which are located in the area where the mold driving force predominantly acts, form a more rigid functional unit by shutting off the connection to the other piston-cylinder units, so that in the associated area Tool parting surface less loss of locking force must be accepted.
Bei nicht abgesperrten Verbindungskanälen hingegen werden die von den asymmetrischen Formauftreibkräften im Schließsystem hervorgerufenen Reaktionskräfte auf das ganze Schließsystem verteilt, wodurch die erhöhte Elastizität des gesamten Schließsystems zur Wirkung kommt. Es läßt sich somit keine örtlich wirkende Versteifung des Zuhalte- bzw. Schließsystems erzielen.In the case of non-blocked connecting channels, on the other hand, the reaction forces caused by the asymmetrical mold driving forces in the locking system are distributed over the entire locking system, whereby the increased elasticity of the entire locking system comes into effect. It is therefore not possible to achieve a locally stiffening of the locking or locking system.
Im Vergleich zur vorliegenden Erfindung kann daher mit dem Schließsystem nach dem Stand der Technik keine örtlich wirkende Versteifung des Zuhalte- bzw. Schließsystems erzielt werden.In comparison to the present invention, therefore, no locally acting stiffening of the locking or locking system can be achieved with the locking system according to the prior art.
Die Erfindung ist gemäß Unteranspruch 3 auch bevorzugt an sogenannten Zweiplatten-Spritzgießmaschinen anwendbar, bei denen die den Schließdruck erzeugenden Kolben der Kolben-Zylindereinheiten Bestandteile der Holme der Spritzgießmaschine sind. Die Erfindung wird nachfolgend anhand eines in der Zeichnung dargestellten Ausführungsbeispiels erläutert. Es zeigen:The invention is also preferably applicable to so-called two-platen injection molding machines, in which the pistons of the piston-cylinder units which generate the closing pressure are components of the spars of the injection molding machine. The invention is explained below with reference to an embodiment shown in the drawing. Show it:
Fig. 1 in schemati scher Darstellung den Schnitt durch eine Zwei- platten-Spritzgießmaschine gemäß der Schnittlinie I-I in Fig. 2 undFig. 1 shows a schematic representation of the section through a two-plate injection molding machine according to section line I-I in Fig. 2 and
Fig. 2 die Schnittansicht gemäß der Schnittlinie II-II in Fig. 1.2 shows the sectional view along the section line II-II in FIG. 1.
Die Fig. 1 und 2 zeigen eine sogenannte Zweiplatten-Spritzgieß- maschine, bei der eine erste Werkzeughalfte 1 auf einer festen Formaufspannplatte 2 und eine zweite Werkzeughalfte 3 auf einer beweglichen Formaufspannplatte 4 befestigt sind. In der beweglichen Formaufspannplatte 4 sind Kolben-Säuleneinheiten 5, 6, 7 und 8 befestigt, die die feste Formaufspannplatte 2 durchsetzen und in Kolben-Zylindereinheiten 9, 10 11 und 12 reversierbar geführt sind. Die Kolben 13, 14, 15 und 16 der Kolben-Säuleneinheiten 5-8 unterteilen die Zylinder der Kolben-Zylindereinheiten 9-12 in jeweils schließseitige Zylinderräume 17, 18, 19 und 20 und in öffnungsseitige Zylinderräume 21, 22, 23 und 24.1 and 2 show a so-called two-platen injection molding machine, in which a first tool half 1 is fixed on a fixed mold mounting plate 2 and a second tool half 3 on a movable mold mounting plate 4. Piston column units 5, 6, 7 and 8 are fastened in the movable platen 4, which pass through the fixed platen 2 and are reversibly guided in piston-cylinder units 9, 10 11 and 12. The pistons 13, 14, 15 and 16 of the piston-column units 5-8 divide the cylinders of the piston-cylinder units 9-12 into cylinder-side cylinder spaces 17, 18, 19 and 20 and into cylinder-side cylinder spaces 21, 22, 23 and 24.
Die schließseitigen Zylinderräume 17-20 sind durch Verbindungskanäle 25, 26 und 27 miteinander verbunden. In der Darstellung nach Fig. 2 sind die Verbindungskanäle 25, 26 und 27 neben der Zeichnung noch nach Art eines hydraulischen Schaltschemas mit 4/2-Wegeventilen 28, 29 und 30 gezeigt, die die Absperrorgane darstellen, mit denen die Verbindungskanäle 25, 26 und 27 wahlweise durchgängig (gezeichnete Schaustellung a) oder gesperrt (Schaltstellung b) schaltbar sind.The closing-side cylinder spaces 17-20 are connected to one another by connecting channels 25, 26 and 27. 2, the connecting channels 25, 26 and 27 are shown in addition to the drawing in the manner of a hydraulic circuit diagram with 4/2-way valves 28, 29 and 30, which represent the shut-off devices with which the connecting channels 25, 26 and 27 can be switched either continuously (shown display position a) or locked (switch position b).
Die Kolben-Säuleneinheiten 5 und 8 sind mit Hydraulikzuführleitungen 28 versehen, über die das hydraulische Druckmedium in die schließseitigen Zylinderräume 17 bis 20 einleitbar ist, wobei das Druckmedium auch über die Verbindungskanäle 25, 26 und 27 geleitet wird.The piston column units 5 and 8 are provided with hydraulic supply lines 28, via which the hydraulic pressure medium into the closing-side cylinder spaces 17 to 20 can be introduced, the pressure medium also being conducted via the connecting channels 25, 26 and 27.
Die Kolben-Säuleneinheiten 7 und 9 sind von Schnellgangkolben 32 und 33 durchsetzt, die sich an der fest mit der festen Formaufspannplatte 2 verbundenen Kolben-Zylindereinheit 10,11 abstützen und in innerhalb der Kolben-Säuleneinheit 6 und 7 ausgebildeten Zylinderräumen 34 reversierbar geführt sind. Die Druckmittel zufuhr für die Schnellgangkolben 32 und 33 ist nicht im einzelnen dargestel lt.The piston-column units 7 and 9 are penetrated by overdrive pistons 32 and 33, which are supported on the piston-cylinder unit 10, 11 firmly connected to the fixed platen 2 and are reversibly guided in cylinder chambers 34 formed within the piston-column unit 6 and 7. The pressure medium supply for the overdrive pistons 32 and 33 is not shown in detail.
Die beiden Werkzeugh lften 1 und 3 schließen eine asymmetrisch zur Maschinenachse 35 angeordnete Formkavität 36 ein, über die nach dem Befüll en mit unter Druck stehender Kunststoffschmelze die Formauftreibkräfte FK erzeugt werden, die den Schließkräften SK entgegewirken, die durch die Beaufschlagung der ringförmigen Kolbenflächen 13' , 14 ' 15 ' und 16' mit hydraulischem Druckmedium entstehen.The two tools 1 and 3 include a mold cavity 36 which is arranged asymmetrically with respect to the machine axis 35 and via which, after being filled with plastic melt under pressure, the mold driving forces FK are generated, which counteract the closing forces SK which are caused by the action of the annular piston surfaces 13 '. , 14 '15' and 16 'with hydraulic pressure medium.
Im Betrieb wird die zunächst die in Offenstellung (nicht dargestellt) befindliche bewegliche Formauspannplatte 4 durch Einleitung von Druckmedium in die schließseitigen Zylinderräume 17-20 in die dargestellte Schließstellung gebracht, in der die beiden Trennflächen 37 und 38 der beiden Werkzeughalften 1 und 3 mit der von den Kolben 13-16 erzeugten Schließkraft SK gegeneinander gepreßt werden.In operation, the movable mold clamping plate 4, which is initially in the open position (not shown), is brought into the closed position shown by introducing pressure medium into the closing-side cylinder spaces 17-20, in which the two separating surfaces 37 and 38 of the two tool halves 1 and 3 are aligned with that of the pistons 13-16 generated closing force SK are pressed against each other.
Dieser Schließkraft SK wirkt an den Trennflächen 37 und 38 die Formauftreibkraft FK entgegen, wodurch die Trennflächen in dem außermittigen bzw. dem asynchronen Bereich, wo sich die Formka- vität 36 befindet, entlastet werden und in dem bezüglich der Maschinenachse 35 gegenüberliegenden Bereich zusätzlich zur herrschenden Schließkraft noch entsprechend belastet werden.This closing force SK counteracts the mold driving force FK at the separating surfaces 37 and 38, as a result of which the separating surfaces in the eccentric or asynchronous area, where the molding card vity 36 is located, relieved and in the opposite area with respect to the machine axis 35 in addition to the prevailing closing force still be loaded accordingly.
Es kann danach der Fall eintreten, daß im Bereich der asynchron wirkenden Formauftreibkraft FK die Zuhaltekraft an den Trennflächen 36 und 37 nicht mehr ausreicht und die Qualität des Spritzgießteils beeinträchtigt wird.It can then occur that in the area of the asynchronously acting mold driving force FK the locking force at the separating surfaces 36 and 37 is no longer sufficient and the quality of the injection molded part is impaired.
Im weiteren kann es vorkommen, daß die Trennflächen in den Bereichen, wo diese mit erhöhter Kraft zusammengepreßt werden einem zu starken Verschleiß unterliegen.Furthermore, it can happen that the separating surfaces in the areas where they are pressed together with increased force are subject to excessive wear.
Zur Vermeidung dieser Nachteile, werden nach der Erfindung die Verbindungskanäle 25,26,27 nach dem Erreichen des Schließdruckes und vor der Druckbeaufschlagung der Formkavität 35 mit Kunststoffschmelze mittels der 4/2-Wegeventi le 29,30 und 31 durch Schalten in die Schaltstellung b (nicht dargestellt) abgesperrt, wodurch einer zu starken Verminderung der Zuhaltekräfte im Bereich der asynchron auftretenden Formauftreibkräfte und einer Überbelastung der Bereiche der Trennflächen entgegengewirkt wird, die in Bezug auf die Maschinenachse 35 dem Angriffspunkt der asynchronen Formauftreibkraft gegenüberliegen.To avoid these disadvantages, according to the invention, the connecting channels 25, 26, 27 after reaching the closing pressure and before pressurizing the mold cavity 35 with plastic melt by means of the 4/2-way valves 29, 30 and 31 by switching to the switching position b ( not shown) blocked, which counteracts an excessive reduction of the locking forces in the area of the asynchronously occurring mold driving forces and an overloading of the areas of the parting surfaces which are opposite the point of application of the asynchronous mold driving force with respect to the machine axis 35.
Je nach Lage des Angriffspunktes und der Intensität der asynchron wirkenden Formauftreibkraft kann es erforderlich sein, eines oder mehrere oder sämtliche 4/2-Wegeventile 29-31 abzusperren. BezugszeichenlisteDepending on the position of the point of attack and the intensity of the asynchronously acting mold driving force, it may be necessary to shut off one or more or all 4/2-way valves 29-31. Reference list
1 Werkzeughalfte 11 tool halves 1
2 feste Formaufspannplatte2 fixed platen
3 Werkzeughalfte 23 tool halves 2
4 bewegliche Formaufspannplatte4 movable platen
5 Kolben-Säuleneinheiten5 piston column units
6 Kolben-Säuleneinheiten6 piston column units
7 Kolben-S uleneinheiten7 piston column units
8 Kolben-Säuleneinheiten8 piston column units
9 Kolben-Zylindereinheit9 piston-cylinder unit
10 Kolben-Zylindereinheit10 piston-cylinder unit
11 Kolben-Zylindereinheit11 piston-cylinder unit
12 Kolben-Zylindereinheit12 piston-cylinder unit
13 Kolben 13' ringförmige Kolbenfläche13 pistons 13 'annular piston surface
14 Kolben 14' ringförmige Kolbenfläche14 pistons 14 'annular piston surface
15 Kolben 15' ringförmige Kolbenfläche15 pistons 15 'annular piston surface
16 Kolben 16' ringförmige Kolbenfläche16 pistons 16 'annular piston surface
17 schließseitiger Zylinderraum17 cylinder chamber on the closing side
18 schließseitiger Zylinderraum18 cylinder chamber on the closing side
19 schließseitiger Zylinderraum19 cylinder chamber on the closing side
20 schließseitiger Zylinderraum20 cylinder chamber on the closing side
21 Öffnungsseitiger Zylinderraum21 Cylinder chamber on the opening side
22 Öffnungsseitiger Zylinderraum22 Cylinder chamber on the opening side
23 Öffnungsseitiger Zylinderraum23 Cylinder chamber on the opening side
24 öffnungsseitiger Zylinderraum24 cylinder chamber on the opening side
25 Verbindungskanal25 connecting channel
26 Verbindungskanal26 connecting channel
27 Verbindungskanal27 connecting channel
28 Hydraulikzuführleitung28 hydraulic supply line
294/2-Wegeventil 4/2-Wegeventil 4/2-Wegeventil Schnellgangkolben Schnei lgangkolben Zylinderräume für Schnei lgangkolben 32 und 33 Maschinenachse bzw. Spritzachse Formkavität Trennfläche (Werkzeughalfte 1) Trennfläche (Werkzeughalfte 2) 294/2-way valve 4/2-way valve 4/2-way valve high-speed piston, high-speed piston cylinder spaces for high-speed pistons 32 and 33 machine axis or injection axis mold cavity parting surface (tool halves 1) parting surface (tool halves 2)

Claims

Spritzgi eßmaschi nePatentansprüche Injection molding machine patent claims
1. Verfahren zur Herstellung von Kunststoffformteilen auf einer Spritzgießmaschine, bei der eine Werkzeughalfte auf einer festen Formaufspannplatte und die andere Werkzeughalfte auf einer beweglichen Formaufspannplatte befestigt sind, wobei die bewegliche Formaufspannplatte mit mindestens zwei hydraulischen Kolben-Zylindereinheiten zur festen Formaufspannplatte rever- sierbar bewegbar ist und wobei die schließseitigen Zylinderräume der Kolben-Zylindereinheiten durch Verbindungskanäle untereinander hydraulisch verbunden sind, dadurch gekennzeichnet, daß die Verbindungskanäle (25,26,27) nach dem Schließen der beiden Werkzeughalften (1,3) und vor dem Einspritzen der Kunststoffschmelze in die von den Werkzeughalften (1,3) eingeschlossene Formkavität (36) abgesperrt werden.1. A process for the production of plastic molded parts on an injection molding machine, in which one tool half is fixed on a fixed platen and the other half of the tool is fixed on a movable platen, the movable platen being reversibly movable with at least two hydraulic piston-cylinder units to form the fixed platen and the closing-side cylinder spaces of the piston-cylinder units being hydraulically connected to one another by connecting channels, characterized in that the connecting channels (25, 26, 27) after the two tool halves (1,3) have been closed and before the plastic melt is injected into the tool halves (1,3) enclosed mold cavity (36) can be shut off.
2. Vorrichtung zur Duchführung des Verfahrens nach Anspruch 1, dadurch gekennzeichnet, daß in den Verbindungskanälen (25,26,27) jeweils ein Absperrorgan (29,30,31) angeordnet ist.2. Device for carrying out the method according to claim 1, characterized in that in each case a shut-off device (29,30,31) is arranged in the connecting channels (25,26,27).
3. Vorrichtung nach Anspruch 2 bei der die Spritzgießmaschine (Zweiplatten-Spritzgießmaschine) mit einer eine Werkzeugh lfte tragenden festen Formaufspannplatte und einer die andere Werkzeughalfte tragenden beweglichen Formaufspannplatte ausgerüstet ist, in der Kolben-Säuleneinheiten befestigt sind, die die feste Formaufspannplatte durchsetzen und in dieser in Kolben-Zylindereinheiten verschieblich geführt sind, wobei die Kolben der Kolben-Säuleneinheiten die Zylinder der Kolben-Zylindereinheiten in schließseitige und in öffnungsseitige Zylinderräume unterteilen, von denen die schließseitigen Zylinderräume durch Verbindungskanäle miteinander hydraulisch verbunden sind, dadurch gekennzeichnet, daß die Verbindungskanäle (25,26,27) mit Absperrorganen (29,30,31) ausgerüstet sind. 3. Apparatus according to claim 2, in which the injection molding machine (two-plate injection molding machine) is equipped with a fixed mold mounting plate carrying a tool half and a movable mold mounting plate carrying the other tool halves, in which piston-column units are fastened which pass through the fixed mold mounting plate and in this are displaceably guided in piston-cylinder units, the Pistons of the piston-column units divide the cylinders of the piston-cylinder units into locking-side and opening-side cylinder spaces, of which the locking-side cylinder spaces are hydraulically connected to one another by connecting channels, characterized in that the connecting channels (25, 26, 27) have shut-off devices (29, 30 , 31) are equipped.
PCT/EP1999/002404 1998-04-16 1999-04-09 Injection moulding machine WO1999054111A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP55239199A JP2002505628A (en) 1998-04-16 1999-04-09 Injection molding machine
EP99920617A EP0996528A1 (en) 1998-04-16 1999-04-09 Injection moulding machine
CA002294926A CA2294926A1 (en) 1998-04-16 1999-04-09 Injection moulding machine

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1998116852 DE19816852C1 (en) 1998-04-16 1998-04-16 Plastic injection moulding machine has prior operated outlet closures
DE19816852.7 1998-04-16

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WO1999054111A1 true WO1999054111A1 (en) 1999-10-28

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CA (1) CA2294926A1 (en)
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WO (1) WO1999054111A1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2147425A5 (en) * 1971-07-27 1973-03-09 Serea Hydraulic injection moulding press - with axially balanced stresses
FR2358261A2 (en) * 1976-07-14 1978-02-10 Hehl Karl MOLD CLOSING DEVICE OF AN INJECTION MOLDING MACHINE
EP0562181A1 (en) * 1992-03-23 1993-09-29 Krauss-Maffei Aktiengesellschaft Clamping device for an injection moulding machine
WO1994013453A1 (en) * 1992-12-05 1994-06-23 E.M.B.-Redman Limited Pressure die casting machine
DE4344340A1 (en) 1993-12-23 1995-06-29 Krauss Maffei Ag Mold closing device for an injection molding machine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2147425A5 (en) * 1971-07-27 1973-03-09 Serea Hydraulic injection moulding press - with axially balanced stresses
FR2358261A2 (en) * 1976-07-14 1978-02-10 Hehl Karl MOLD CLOSING DEVICE OF AN INJECTION MOLDING MACHINE
EP0562181A1 (en) * 1992-03-23 1993-09-29 Krauss-Maffei Aktiengesellschaft Clamping device for an injection moulding machine
WO1994013453A1 (en) * 1992-12-05 1994-06-23 E.M.B.-Redman Limited Pressure die casting machine
DE4344340A1 (en) 1993-12-23 1995-06-29 Krauss Maffei Ag Mold closing device for an injection molding machine

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DE19816852C1 (en) 1999-10-07
JP2002505628A (en) 2002-02-19
EP0996528A1 (en) 2000-05-03
CA2294926A1 (en) 1999-10-28

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