DE19717302A1 - Pressure injection moulding process especially suitable for high quality and micro-engineered parts - Google Patents

Pressure injection moulding process especially suitable for high quality and micro-engineered parts

Info

Publication number
DE19717302A1
DE19717302A1 DE1997117302 DE19717302A DE19717302A1 DE 19717302 A1 DE19717302 A1 DE 19717302A1 DE 1997117302 DE1997117302 DE 1997117302 DE 19717302 A DE19717302 A DE 19717302A DE 19717302 A1 DE19717302 A1 DE 19717302A1
Authority
DE
Germany
Prior art keywords
injection molding
parts
plastic
micro
injection moulding
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
DE1997117302
Other languages
German (de)
Inventor
Harald Ing Bleier
Christian Dr Kukla
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Battenfeld GmbH
Original Assignee
Battenfeld 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 Battenfeld GmbH filed Critical Battenfeld GmbH
Priority to DE1997117302 priority Critical patent/DE19717302A1/en
Publication of DE19717302A1 publication Critical patent/DE19717302A1/en
Withdrawn legal-status Critical Current

Links

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
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/58—Details
    • B29C45/63—Venting or degassing means
    • 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
    • B29C45/26—Moulds
    • B29C45/34—Moulds having venting means

Landscapes

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

Abstract

A new method makes pressure-injected plastic mouldings. The plasticised mass is injected into a mould with two or more dies (2, 3). Parts of the injection moulding machine, including at least the mould (2, 3) and the plasticiser (1), are held under vacuum (V) during injection. The corresponding equipment is also claimed.

Description

Die Erfindung betrifft ein Verfahren zur Herstellung von Formteilen aus Kunstunststoff durch Spritzgießen, bei dem Kunststoff in einer Plastifiziereinrichtung plastifiziert wird und der plastifizierte Kunststoff in ein mindestens zweiteiliges Spritzgießwerkzeug eingespritzt wird.The invention relates to a method for producing molded parts from Plastic by injection molding, with the plastic in one Plasticizing device is plasticized and the plasticized plastic is injected into an at least two-part injection mold.

Desweiteren betrifft die Erfindung eine Vorrichtung zum Spritzgießen von Formteilen aus Kunststoff.Furthermore, the invention relates to a device for injection molding of molded parts made of plastic.

Neue Entwicklungen in der Spritzgießtechnologie versuchen, immer kleinere Teile aus Kunststoff formgenau herzustellen. Es ist nämlich in jüngerer Zeit der Bedarf aufgetreten, Spritzgießformteile mit besonders kleinen Ausmaßen herzustellen. Hier sind mikro-mechanische Bauteile (z. B. Mikrozahnräder für Kleinstpumpen), medizintechnische Kleinteile und optoelektronische Elemente (z. B. Teile für Lichtleiter) als Beispiel­ bauteile zu nennen. Die Herstellung solcher Teile mit bekannten Spritzgießverfahren und Spritzgießmaschinen führt zu Problemen.Always trying new developments in injection molding technology to produce smaller parts made of plastic with exact shape. Because it is in More recently the need has arisen, with injection molding parts with special small dimensions. Here are micro-mechanical components (e.g. micro gears for small pumps), small medical parts and optoelectronic elements (e.g. parts for light guides) as an example to name components. The manufacture of such parts with known Injection molding processes and injection molding machines lead to problems.

Eines dieser Probleme ist durch die Fluidmechanik im Werkzeug bedingt. Da bei Kleinstteilen die Abmessungen in extremen Fällen bis auf wenige Mikrometer klein werden können, ist es aufgrund der Viskosität der Kunststoffschmelze nicht sicher gegeben, daß Schmelze bis in die äußersten Bereich der Werkzeugkavität gelangt, auch wenn mit üblichem Schmelzedruck gearbeitet wird.One of these problems is due to the fluid mechanics in the tool. As for small parts, the dimensions in extreme cases except for a few Micrometer can become small, it is due to the viscosity of the Plastic melt not certain that melt will go right into the reaches the outermost area of the tool cavity, even if with the usual Melt pressure is worked.

Weiterhin spielt die Homogenität der Schmelze bei der Herstellung solch kleiner Teile eine wesentliche Rolle. Geringfügige Einschlüsse, z. B. Gasblasen, führen bei Mikro-Formteilen dann bereits zum Ausschuß.Furthermore, the homogeneity of the melt plays a role in the production of such small parts play an essential role. Minor inclusions, e.g. B. Gas bubbles then lead to rejects for micro-molded parts.

Der Erfindung liegt daher die Aufgabe zugrunde, ein verbessertes Spritzgießverfahren und eine zugehörige Vorrichtung zu schaffen, mit dem bzw. mit der es möglich ist, stets eine vollständige Kavitätsfüllung auch bei sehr kleinen Werkzeugkavitäten zu erreichen und weiterhin für eine möglichst homogene und insofern einschlußfreie Schmelze zu sorgen.The invention is therefore based on the object of an improved Injection molding process and an associated device to create with which it is possible to always fill the cavity completely to reach even with very small tool cavities and still for  a melt that is as homogeneous as possible and thus free of inclusions to care.

Die Lösung der Aufgabe durch die Erfindung ist dadurch gekennzeichnet, daß Teile der Spritzgießmaschine, mindestens das Spritzgießwerkzeug (2, 3) und die Plastifiziereinrichtung (1), zumindest während des Spritzgießprozesses, unter einem Vakuum (V) gehalten werden.The achievement of the object by the invention is characterized in that parts of the injection molding machine, at least the injection mold ( 2 , 3 ) and the plasticizing device ( 1 ), are held under a vacuum (V), at least during the injection molding process.

Bei der zugehörigen Vorrichtung ist vorgesehen, daß Mittel (4, 5) zur Erzeugung eines Vakuums (V) zumindest im Bereich des Spritzgießwerkzeugs (2, 3) und der Plastifiziereinrichtung (1) vorhanden sind.The associated device provides that means ( 4 , 5 ) for generating a vacuum (V) are present at least in the area of the injection mold ( 2 , 3 ) and the plasticizing device ( 1 ).

Damit wird in vorteilhafter Weise erreicht, daß die Kunststoffschmelze bis in den Endbereich der Kavität vordringen kann, da sich in dieser nun kein störendes bzw. bremsendes Luftpolster mehr befindet. Weiterhin wird durch das Vakuum eine Entgasung der Schmelze bewirkt, so daß sie weitgehend störungsfrei ist. Ein weiterer Vorteil ist, daß durch das Vakuum Reinraumbedingungen im evakuierten Bereich geschaffen werden.This advantageously ensures that the plastic melt can penetrate into the end area of the cavity, since it is now in this there is no longer a disturbing or braking air cushion. Farther degassing of the melt is effected by the vacuum, so that it is largely trouble-free. Another advantage is that Vacuum clean room conditions created in the evacuated area will.

In der Zeichnung ist ein Ausführungsbeispiel der Erfindung dargestellt. Die Figur zeigt schematisch den Schnitt durch eine Spritzgießmaschine.In the drawing, an embodiment of the invention is shown. The figure shows schematically the section through an injection molding machine.

In der Figur ist eine Plastifiziereinrichtung 1 zu sehen, in der in üblicher Weise Kunststoff plastifiziert wird. Eine Plastifizierschnecke rotiert dabei in einem Schneckenzylinder. Zwecks Einspritzung der Kunststoff­ schmelze in das Spritzgießwerkzeug, das aus den Teilen 2 und 3 besteht, wird die Schnecke mit einer Kraft F translatorisch im Schneckenzylinder bewegt (s. Doppelpfeil).The figure shows a plasticizing device 1 in which plastic is plasticized in the usual way. A plasticizing screw rotates in a screw cylinder. In order to inject the plastic melt into the injection mold, which consists of parts 2 and 3 , the screw is moved translationally in the screw cylinder with a force F (see double arrow).

Um gewisse Teile der Spritzgießmaschine (oder um die gesamte Spritzgießmaschine herum) ist eine Evakuierhaube 4 gelegt, die im skizzierten Falle an der Werkzeugträgerplatte abgedichtet anliegt. Mittels einer Vakuumpumpe 5, die von einem Motor M angetrieben wird, wird der Bereich der Spritzgießmaschine evakuiert, um den die Haube 4 gelegt ist. Im vorliegenden Falle trifft das für die Plastifiziereinrichtung 1 und das Werkzeug 2, 3 zu.An evacuation hood 4 is placed around certain parts of the injection molding machine (or around the entire injection molding machine), which in the sketched case lies tightly against the tool carrier plate. The area of the injection molding machine around which the hood 4 is placed is evacuated by means of a vacuum pump 5 , which is driven by a motor M. In the present case, this applies to the plasticizing device 1 and the tool 2 , 3 .

Das durch die Mittel 4, 5 zur Erzeugung des Vakuums erzeugte Vakuum V bewirkt, daß Gasblasen aus der einzuspritzenden Schmelze gelöst werden, so daß die Schmelze besser homogenisiert wird. Weiterhin gelangt die Schmelze beim Einspritzen auch bei sehr kleinen Kavitätsabmessungen bis in die - von der Plastifiziereinrichtung her gesehen - entferntesten Bereiche der Kavität, so daß eine vollständige Kavitätsfüllung gewährleistet ist.The vacuum V generated by the means 4 , 5 for generating the vacuum causes gas bubbles to be released from the melt to be injected, so that the melt is better homogenized. Furthermore, when the injection is carried out, even with very small cavity dimensions, the melt reaches the most distant areas of the cavity, as seen from the plasticizing device, so that complete cavity filling is ensured.

BezugszeichenlisteReference list

11

Plastifiziereinrichtung
Plasticizer

22nd

, ,

33rd

Spritzgießwerkzeug
Injection mold

44th

, ,

55

Mittel zur Erzeugung eines Vakuums
Means for creating a vacuum

44th

Evakuierhaube
Evacuation hood

55

Vakuumpumpe
V Vakuum
Vacuum pump
V vacuum

Claims (2)

1. Verfahren zur Herstellung von Formteilen aus Kunststoff durch Spritzgießen, bei dem Kunststoff in einer Plastifiziereinrichtung (1) plastifiziert wird und der plastifizierte Kunststoff in ein mindestens zweiteiliges Spritzgießwerkzeug (2, 3) eingespritzt wird, dadurch gekennzeichnet, daß Teile der Spritzgießmaschine, mindestens das Spritzgießwerkzeug (2, 3) und die Plastifiziereinrichtung (I), zumindest während des Spritzgießprozesses, unter einem Vakuum (V) gehalten werden.1. A method for producing molded parts from plastic by injection molding, in which plastic is plasticized in a plasticizing device ( 1 ) and the plasticized plastic is injected into an at least two-part injection molding tool ( 2 , 3 ), characterized in that parts of the injection molding machine, at least that Injection molding tool ( 2 , 3 ) and the plasticizing device (I), at least during the injection molding process, are kept under a vacuum (V). 2. Vorrichtung zum Spritzgießen von Formteilen aus Kunststoff, insbesondere zur Durchführung des Verfahrens nach Anspruch 1, mit einem mindestens zweiteiligen Spritzgießwerkzeug (2, 3) und einer Plastifiziereinrichtung (1), gekennzeichnet durch Mittel (4, 5) zur Erzeugung eines Vakuums (V) zumindest im Bereich des Spritzgießwerkzeugs (2, 3) und der Plastifiziereinrichtung (1).2. Device for injection molding molded parts made of plastic, in particular for carrying out the method according to claim 1, with an at least two-part injection molding tool ( 2 , 3 ) and a plasticizing device ( 1 ), characterized by means ( 4 , 5 ) for generating a vacuum (V ) at least in the area of the injection mold ( 2 , 3 ) and the plasticizing device ( 1 ).
DE1997117302 1997-04-24 1997-04-24 Pressure injection moulding process especially suitable for high quality and micro-engineered parts Withdrawn DE19717302A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE1997117302 DE19717302A1 (en) 1997-04-24 1997-04-24 Pressure injection moulding process especially suitable for high quality and micro-engineered parts

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1997117302 DE19717302A1 (en) 1997-04-24 1997-04-24 Pressure injection moulding process especially suitable for high quality and micro-engineered parts

Publications (1)

Publication Number Publication Date
DE19717302A1 true DE19717302A1 (en) 1998-10-29

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Application Number Title Priority Date Filing Date
DE1997117302 Withdrawn DE19717302A1 (en) 1997-04-24 1997-04-24 Pressure injection moulding process especially suitable for high quality and micro-engineered parts

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DE (1) DE19717302A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10332118A1 (en) * 2003-07-09 2005-02-10 Pfisterer Kontaktsysteme Gmbh & Co. Kg Device for electrical connection to a power supply line for medium or high voltage and method for producing an insulating part of such a device
DE102012103720A1 (en) 2012-04-27 2013-10-31 Karlsruher Institut für Technologie Method for manufacturing micro-mold component, involves creating space with removal device comprising micro mold portion, by separating molding form support plate and sprue plate from micro molding insert

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3323611A1 (en) * 1982-07-03 1984-01-05 Bipel Ltd., Sutton Coldfield, West Midlands MOLDING MACHINE

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3323611A1 (en) * 1982-07-03 1984-01-05 Bipel Ltd., Sutton Coldfield, West Midlands MOLDING MACHINE

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10332118A1 (en) * 2003-07-09 2005-02-10 Pfisterer Kontaktsysteme Gmbh & Co. Kg Device for electrical connection to a power supply line for medium or high voltage and method for producing an insulating part of such a device
DE102012103720A1 (en) 2012-04-27 2013-10-31 Karlsruher Institut für Technologie Method for manufacturing micro-mold component, involves creating space with removal device comprising micro mold portion, by separating molding form support plate and sprue plate from micro molding insert
DE102012103720B4 (en) * 2012-04-27 2015-01-22 Karlsruher Institut für Technologie Method and apparatus for a micro injection molding tool

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