WO1999048665A1 - Injection moulding machine for producing deep-drawn parts - Google Patents

Injection moulding machine for producing deep-drawn parts Download PDF

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Publication number
WO1999048665A1
WO1999048665A1 PCT/EP1999/001867 EP9901867W WO9948665A1 WO 1999048665 A1 WO1999048665 A1 WO 1999048665A1 EP 9901867 W EP9901867 W EP 9901867W WO 9948665 A1 WO9948665 A1 WO 9948665A1
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WO
WIPO (PCT)
Prior art keywords
deep
mold
drawn
injection molding
molding machine
Prior art date
Application number
PCT/EP1999/001867
Other languages
German (de)
French (fr)
Inventor
Karl Hehl
Original Assignee
Karl Hehl
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 Karl Hehl filed Critical Karl Hehl
Publication of WO1999048665A1 publication Critical patent/WO1999048665A1/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
    • B29C45/1418—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 the inserts being deformed or preformed, e.g. by the injection pressure
    • B29C45/14221—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 the inserts being deformed or preformed, e.g. by the injection pressure by tools, e.g. cutting 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
    • B29C45/14—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
    • B29C45/1418—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 the inserts being deformed or preformed, e.g. by the injection pressure
    • B29C2045/14237—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 the inserts being deformed or preformed, e.g. by the injection pressure the inserts being deformed or preformed outside the mould or mould cavity
    • B29C2045/14245—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 the inserts being deformed or preformed, e.g. by the injection pressure the inserts being deformed or preformed outside the mould or mould cavity using deforming or preforming means outside the mould cavity
    • 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
    • B29C45/40—Removing or ejecting moulded articles
    • B29C45/42—Removing or ejecting moulded articles using means movable from outside the mould between mould parts, e.g. robots

Definitions

  • the invention relates to an injection molding machine for producing deep-drawn parts according to the preamble of claim 1.
  • the injection molding machine is a plastic injection molding machine for processing plastics and other plasticizable materials such as ceramic or powdery materials.
  • Such an injection molding machine is e.g. known from EP 0 333 052 B1.
  • a drawing tool is used in the mold clamping space of a conventional injection molding machine, so that the press force of the injection molding machine can be used for deep-drawing deep-drawn parts.
  • the drawing tool works with a differential piston and can be controlled via a wide variety of hydraulic controls so that the external force generated by the injection molding machine can even be converted into a much larger opposing drawing force if necessary.
  • an injection molding machine can be used for deep drawing, while at the same time it is ensured that the thermoformed material does not tear as a result of the control.
  • the object of the present invention is to develop an injection molding machine of the type mentioned at the outset in such a way that deep drawing and injection molding are made possible in one work cycle and thus derived from a closing movement.
  • the mold accommodated in the mold clamping space now includes a deep-drawing device on the one hand, but also a mold cavity on the other hand.
  • the mold cavity is arranged next to the deep-drawn part in such a way that the deep-drawn part can be overmolded or molded.
  • the mold cavity is at least partially sealed by the deep-drawn part during injection.
  • the mold is a two-part, the deep-drawn part being deep-drawn in one cycle and already being pulled out of a mold cavity during deep-drawing, so that in the mold cavity 3 -
  • the plastic can be injected onto the deep-drawn part in the same cycle.
  • 1 is a partially sectioned side view of a section of an injection molding machine in the area of the mold clamping space
  • FIG. 2 is an enlarged view of the mold clamping space of FIG. 1 during the closing movement and before deep-drawing the deep-drawn part
  • FIG. 3 shows a representation according to FIG. 2 of the mold clamping space with the mold closed and the deep-drawn deep-drawn part
  • Fig. 4 is an enlarged view of Fig. 3 during the injection of plastic material.
  • the injection molding machine usually a plastic injection molding machine, is used to process plasticizable materials such as plastics, powdery materials or ceramic materials.
  • the basic structure results from the illustration according to Fig.l, although essentially only the mold clamping unit is shown there.
  • This mold clamping unit is arranged on a machine base 40 on which a stationary mold carrier 10 is attached.
  • the stationary mold carrier 10 works together with a movable mold carrier 11, a mold clamping space R being provided between the stationary mold carrier and the movable mold carrier for receiving the parts of a mold 12.
  • This shape is used to form deep-drawn parts 16 by means of a deep-drawing device 20, which is used for deep-drawing 4 -
  • Clamping unit C uses the applied forces.
  • This closing unit is usually used to cyclically open and close the mold while moving the movable mold carrier 11 towards and away from the stationary mold carrier.
  • the injection molding machine also has a schematically indicated injection molding unit S for processing plasticizable material.
  • a two-part mold 12 consisting of the parts 12a and 12b is included in the mold clamping space R.
  • At least one mold cavity 14 is formed in the mold 12 in addition to the deep-drawing device for deep-drawing the deep-drawn parts 16.
  • at least one deep-drawn part 16 in the mold 12 is at least partially arranged in the mold cavity 14 during the injection of plasticizable material in the same cycle, so that after the cycle an overmolded deep-drawn part 27 can be removed, in which a connection between the deep-drawn part 16 and the injected plastic has taken place.
  • the deep-drawing of the deep-drawn part 16 and the injection of plastic onto the same deep-drawn part takes place in the same cycle.
  • the deep-drawing device 20 is arranged on the part 12a of the mold assigned to the movable mold carrier 11.
  • the drawing mold 19 is located on the opposite part 12b arranged on the stationary mold carrier 10.
  • the blank 17 from which the deep-drawn part 16 is deep-drawn is located behind deep drawing in the mold cavity 14.
  • Figs. 1-4 the mode of operation is shown. Via a transfer device 29, a flat board 17 made of material that is flowable during deep drawing is transferred into an engagement space 28 between the parts 12a, 12b of the mold 12.
  • the transfer device 22 has a gripper 26 with two holding systems 26a, 26b. In Fig. 1, the gripper is located outside the mold clamping space R, the circuit board being arranged on a holding system 26a. This is just in the tool itself 5 -
  • Deep-drawing device 20 is in its initial position.
  • Fig. 2 shows the next position.
  • the transfer device 22 has brought the board 17 into the mold 12, which is now located between the parts 12a, 12b of the mold 12.
  • the gripper 26 with the holding system 26b on the opposite side that is to say on the part 12b, has removed the overmolded deep-drawn part 27, which is now fed to a storage device, not shown in the drawing can.
  • the gripper preferably works pneumatically, and likewise 12 vacuum connections can be provided in the mold for holding the board and overmolded deep-drawn part 27.
  • the operation of the deep-drawing device is such that the external force applied by the clamping unit C is converted into a pulling force within the deep-drawing device, for which purpose hydraulic media are displaced in a regulated or controlled manner, so that there are opposing movements within the tool.
  • This procedure is among others in EP 0 333 052 B1, the disclosure content of which is expressly made the subject of the present invention.
  • the basic mode of operation of the deep-drawing device 20 is, however, also explained again below.
  • the deep-drawing device 20 has a central piston 30 which is surrounded by an annular working piston 31. Between ar- beitskolben 31 and the piston rod of the central piston 30, a hydraulic chamber 41 is provided which can be supplied with hydraulic medium via the line 42.
  • the working piston 31 is surrounded by an annular piston 32.
  • a hydraulic chamber 43 also adjoins the annular piston 32 and can be acted upon by hydraulic medium via line 44.
  • the corresponding valves, which enable control and regulation of the conditions in the hydraulic spaces 41, 43, are not shown in the drawing. 2, the working piston 20 has now come into contact with the part 12a designed as a cylinder housing.
  • the drawing mold 19 is also in contact with the sheet metal holder 18.
  • the part 12a moves relative to the annular piston 32, which is already supported on the part 12b here via the drawing mold 19 and the sheet metal holder 18. This reduces the space 45 on the one hand, but at the same time displaces the hydraulic medium located in the hydraulic space 43, the hydraulic space 46 in FIG. 3 filling with hydraulic medium and moving the working piston 31 to the right.
  • the working piston 31 actuates the punch 21 for deep drawing the deep-drawn part 16.
  • the movements of the annular piston 32 and the working piston 31 can be additionally influenced via the lines 42 and 44.
  • the deep-drawn part 16 has now been created in FIG. 3.
  • a comparison between FIG. 2 and FIG. 3 further shows that the circuit board 17 originally filled a large part of the mold cavity 14.
  • the punch 21 penetrates into the deep drawing space T and pulls the edges of the board 17 out of the mold clamping space.
  • the edge 16a of the deep-drawn part 16 now forms part of the border of the mold cavity 14.

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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 an injection moulding machine for processing plastic materials and other plasticisable masses. Said machine comprises a mould closing unit which houses a cyclically opening and closing mould (12) for forming deep-drawn parts (16) by means of a deep-drawing device positioned in said mould. A mould cavity is located in the mould (12) next to the deep-drawing device (20). The deep-drawn part (16) situated in the mould (12) during the injection of plasticisable material is positioned during the same cycle at least partly in the mould cavity (14) such as to seal it hermetically. In this way a deep-drawn part can be produced by both deep-drawing and injection moulding in a single working cycle and therefore by means of a single closing movement.

Description

Spritzgießmaschine zur Herstellung von TiefziehteilenInjection molding machine for the production of deep-drawn parts
Beschreibungdescription
Bezug zu verwandten AnmeldungenRelation to related applications
Die vorliegende Anmeldung beansprucht die Priorität der deutschen Gebrauchsmusteranmeldung 298 05 254.7, hinterlegt am 24.03.1998, deren Offenbarungsgehalt hiermit ausdrücklich auch zum Gegenstand der vorliegenden Anmeldung gemacht wird.The present application claims the priority of the German utility model application 298 05 254.7, filed on March 24, 1998, the disclosure content of which is hereby expressly made the subject of the present application.
Technisches GebietTechnical field
Die Erfindung betrifft eine Spritzgießmaschine zur Herstellung von Tiefziehteilen nach dem Oberbegriff des Anspruches 1. Bei der Spritzgießmaschine handelt es sich um eine Kunststoff-Spritzgießmaschine zur Verarbeitung von Kunststoffen und anderer plastifi- zierbarer Massen wie keramische oder pulvrige Massen.The invention relates to an injection molding machine for producing deep-drawn parts according to the preamble of claim 1. The injection molding machine is a plastic injection molding machine for processing plastics and other plasticizable materials such as ceramic or powdery materials.
Stand der TechnikState of the art
Eine derartige Spritzgießmaschine ist z.B. aus der EP 0 333 052 Bl bekannt. In den Formspannraum einer üblichen Spritzgießmaschine wird dabei ein Ziehwerkzeug eingesetzt, so daß die Pressenkraft der Spritzgießmaschine zum Tiefziehen von Tiefziehteilen eingesetzt werden kann. Das Ziehwerkzeug arbeitet dabei mit einem Differentialkolben und kann über verschiedenste hydraulische Steuerungen so gesteuert werden, daß die von der Spritzgießmaschine erzeugte externe Kraft bedarfsweise sogar in eine wesentlich größere gegenläufige Ziehkraft umgewandelt werden kann. Dadurch kann eine Spritzgießmaschine zum Tiefziehen eingesetzt werden, wobei gleichzeitig darauf geachtet wird, daß es infolge der Steuerung nicht zu einem Reißen des tiefgezogenen Materials kommt.Such an injection molding machine is e.g. known from EP 0 333 052 B1. A drawing tool is used in the mold clamping space of a conventional injection molding machine, so that the press force of the injection molding machine can be used for deep-drawing deep-drawn parts. The drawing tool works with a differential piston and can be controlled via a wide variety of hydraulic controls so that the external force generated by the injection molding machine can even be converted into a much larger opposing drawing force if necessary. As a result, an injection molding machine can be used for deep drawing, while at the same time it is ensured that the thermoformed material does not tear as a result of the control.
Dennoch findet dort, obwohl die entsprechenden Vorrichtungen, wie z.B. eine Spritzgießeinheit vorgesehen sind, noch kein Um- oder An- 2 -Nevertheless, although the corresponding devices, such as an injection molding unit, are provided, there is still no need to move or 2 -
spritzen des Tiefziehteils mit plastifizierbarem Material, wie z.B. Kunststoff statt. Dies liegt daran, daß das Tiefziehen und das Spritzgießen verschiedene Voraussetzungen haben. Beim Tiefziehen muß sichergestellt werden, daß das zu verarbeitende Material genügend Raum hat, um sich zu verformen, aber nicht soviel Raum, daß sich ein Faltenwurf ergibt. Insofern muß hier also stets um den Tiefziehstempel und die Ziehform herum ein gewisser Freiraum, zumindest teilweise, beibehalten werden. Demgegenüber ist es beim Spritzgießen erforderlich, den mit plastifiziertem Material zu füllenden Formhohlraum soweit als möglich abzudichten, damit sich überhaupt das plastifi- zierbare Material in den Formhohlraum unter entsprechendem Druck einbringen läßt und es nicht beim fertigen Produkt zu Qualitätseinbußen durch Schrumpfung, Schwund oder ähnliches kommt.injection molding of the deep-drawn part with plasticizable material, e.g. Plastic instead. This is because deep drawing and injection molding have different requirements. When deep drawing, it must be ensured that the material to be processed has enough space to deform, but not so much space that there is a fold. In this respect, a certain amount of free space, at least in part, must always be maintained around the deep-drawing die and the drawing mold. In contrast, in injection molding it is necessary to seal the mold cavity to be filled with plasticized material as far as possible so that the plasticizable material can be introduced into the mold cavity under appropriate pressure and the finished product does not suffer quality losses due to shrinkage, shrinkage or the like .
Zusammenfassung der ErfindungSummary of the invention
Ausgehend von diesem Stand der Techni liegt der vorliegenden Erfindung die Aufgabe zugrunde, eine Spritzgießmaschine der eingangs genannten Gattung so weiterzubilden, daß in einem Arbeitszyklus und damit abgeleitet von einer Schließbewegung ein Tiefziehen und Spritzgießen ermöglicht wird.Based on this state of the art, the object of the present invention is to develop an injection molding machine of the type mentioned at the outset in such a way that deep drawing and injection molding are made possible in one work cycle and thus derived from a closing movement.
Diese Aufgabe wird durch eine Spritzgießmaschine mit den Merkmalen des Anspruches 1 gelöst.This object is achieved by an injection molding machine with the features of claim 1.
Die im Formspannraum aufgenommene Form umfaßt nun einerseits eine Tiefzieheinrichtung, andererseits daneben aber auch einen Formhohlraum. Um im gleichen Zyklus sowohl ein Tiefziehen als auch ein Spritzgießen zu ermöglichen, ist der Formhohlraum neben dem Tiefziehteil so angeordnet, daß das Tiefziehteil umspritzt oder angespritzt werden kann. Der Formhohlraum wird zumindest teilweise vom Tiefziehteil beim Einspritzen abgedichtet.The mold accommodated in the mold clamping space now includes a deep-drawing device on the one hand, but also a mold cavity on the other hand. In order to enable both deep drawing and injection molding in the same cycle, the mold cavity is arranged next to the deep-drawn part in such a way that the deep-drawn part can be overmolded or molded. The mold cavity is at least partially sealed by the deep-drawn part during injection.
Nach den Ansprüchen 2-4 ist die Form eine zweiteilige, wobei in einem Zyklus das Tiefziehteil tiefgezogen und beim Tiefziehen aus einem Formhohlraum bereits herausgezogen wird, so daß im Formhohl- 3 -According to claims 2-4, the mold is a two-part, the deep-drawn part being deep-drawn in one cycle and already being pulled out of a mold cavity during deep-drawing, so that in the mold cavity 3 -
räum noch im selben Zyklus der Kunststoff an das Tiefziehteil angespritzt werden kann.The plastic can be injected onto the deep-drawn part in the same cycle.
Kurzbeschreibung der FigurenBrief description of the figures
Fig. 1 eine teilweise geschnittene Seitenansicht eines Ausschnitts aus einer Spritzgießmaschine im Bereich des Formspannraums,1 is a partially sectioned side view of a section of an injection molding machine in the area of the mold clamping space,
Fig. 2 eine vergrößerte Darstellung des Formspannraums von Fig. 1 während der Schließbewegung und vor dem Tiefziehen des Tiefziehteils,2 is an enlarged view of the mold clamping space of FIG. 1 during the closing movement and before deep-drawing the deep-drawn part,
Fig. 3 eine Darstellung gemäß Fig. 2 des Formspannraums bei geschlossener Form und tiefgezogenem Tiefziehteil,3 shows a representation according to FIG. 2 of the mold clamping space with the mold closed and the deep-drawn deep-drawn part,
Fig. 4 eine vergrößerte Darstellung von Fig. 3 während des Einspritzens von Kunststoffmaterial.Fig. 4 is an enlarged view of Fig. 3 during the injection of plastic material.
Ausführliche Beschreibung bevorzugter AusführungsformenDetailed description of preferred embodiments
Die Erfindung wird jetzt beispielhaft unter bezug auf die beigefügten Zeichnungen näher erläutert. Allerdings handelt es sich bei den Ausführungsbeispielen lediglich um Beispiele, die nicht das erfinderische Konzept auf eine bestimmte physikalische Anordnung beschränken sollen.The invention will now be explained in more detail by way of example with reference to the accompanying drawings. However, the exemplary embodiments are merely examples which are not intended to restrict the inventive concept to a specific physical arrangement.
Die Spritzgießmaschine, üblicherweise eine Kunststoff-Spritzgießmaschine, dient zur Verarbeitung plastifizierbarer Massen wie z.B. Kunststoffe, pulvrige Massen oder keramische Massen. Der grundsätzliche Aufbau ergibt sich aus der Darstellung gemäß Fig.l, wenngleich dort im wesentlichen nur die Formschließeinheit dargestellt ist. Diese Formschließeinheit ist auf einem Maschinenfuß 40 angeordnet, an dem ein stationärer Formträger 10 befestigt ist. Der stationäre Formträger 10 arbeitet mit einem beweglichen Formträger 11 zusammen, wobei zwischen stationärem Formträger und beweglichem Formträger ein Formspannraum R zur Aufnahme der Teile einer Form 12 vorgesehen ist. Diese Form dient zur Formung von Tiefziehteilen 16 mittels einer Tiefzieheinrichtung 20, die sich zum Tiefziehen die von einer 4 -The injection molding machine, usually a plastic injection molding machine, is used to process plasticizable materials such as plastics, powdery materials or ceramic materials. The basic structure results from the illustration according to Fig.l, although essentially only the mold clamping unit is shown there. This mold clamping unit is arranged on a machine base 40 on which a stationary mold carrier 10 is attached. The stationary mold carrier 10 works together with a movable mold carrier 11, a mold clamping space R being provided between the stationary mold carrier and the movable mold carrier for receiving the parts of a mold 12. This shape is used to form deep-drawn parts 16 by means of a deep-drawing device 20, which is used for deep-drawing 4 -
Schließeinheit C aufgebrachten Kräfte zunutze macht. Diese Schließeinheit dient üblicherweise zum zyklischen Öffnen und Schließen der Form unter Bewegung des beweglichen Formträgers 11 auf den stationären Formträger zu und von diesem weg. Die Spritzgießmaschine besitzt ferner eine schematisch angedeutete Spritzgießeinheit S zur Aufbereitung von plastifizierbarem Material.Clamping unit C uses the applied forces. This closing unit is usually used to cyclically open and close the mold while moving the movable mold carrier 11 towards and away from the stationary mold carrier. The injection molding machine also has a schematically indicated injection molding unit S for processing plasticizable material.
In Fig. 1 ist eine zweiteilige Form 12, bestehend aus den Teilen 12a und 12b im Formspannraum R aufgenommen. In der Form 12 ist neben der Tiefzieheinrichtung zum Tiefziehen der Tiefziehteile 16 wenigstens ein Formhohlraum 14 ausgebildet. Während jedes Arbeitszyklus der Spritzgießmaschine ist wenigstens ein Tiefziehteil 16 in der Form 12 beim im gleichen Zyklus erfolgenden Spritzen von plastifizierbare Material zumindest teilweise im Formhohlraum 14 angeordnet, so daß nach dem Zyklus ein umspritztes Tiefziehteil 27 entnommen werden kann, bei dem eine Verbindung zwischen dem Tiefziehteil 16 und dem eingespritzten Kunststoff stattgefunden hat.In Fig. 1, a two-part mold 12, consisting of the parts 12a and 12b is included in the mold clamping space R. At least one mold cavity 14 is formed in the mold 12 in addition to the deep-drawing device for deep-drawing the deep-drawn parts 16. During each working cycle of the injection molding machine, at least one deep-drawn part 16 in the mold 12 is at least partially arranged in the mold cavity 14 during the injection of plasticizable material in the same cycle, so that after the cycle an overmolded deep-drawn part 27 can be removed, in which a connection between the deep-drawn part 16 and the injected plastic has taken place.
Das Tiefziehen des Tiefziehteils 16 und das Anspritzen von Kunststoff an dasselbe Tiefziehteil erfolgt im gleichen Zyklus. Die Tiefzieheinrichtung 20 ist an dem dem beweglichen Formträger 11 zugeordneten Teil 12a der Form angeordnet. Am gegenüberliegenden, am stationären Formträger 10 angeordneten Teil 12b, befindet sich die Ziehform 19. Beim Formschluß ergibt sich zwischen den beiden Teilen 12a, 12b der Form 12 ein Formhohlraum 14. Die Platine 17, aus der das Tiefziehteil 16 tiefgezogen wird, befindet sich nach dem Tiefziehen im Formhohlraum 14.The deep-drawing of the deep-drawn part 16 and the injection of plastic onto the same deep-drawn part takes place in the same cycle. The deep-drawing device 20 is arranged on the part 12a of the mold assigned to the movable mold carrier 11. The drawing mold 19 is located on the opposite part 12b arranged on the stationary mold carrier 10. During the positive locking, there is a mold cavity 14 between the two parts 12a, 12b of the mold 12. The blank 17 from which the deep-drawn part 16 is deep-drawn is located behind deep drawing in the mold cavity 14.
In den Fign. 1-4 ist die Arbeitsweise dargestellt. Über eine Übergabeeinrichtung 29 wird eine flache, aus beim Tiefziehen fliessfähigem Material bestehende Platine 17 in einen Eingriffsraum 28 zwischen den Teilen 12a, 12b der Form 12 überführt. Die Übergabeeinrichtung 22 besitzt einen Greifer 26 mit zwei Haltesystemen 26a, 26b. In Fig. 1 befindet sich der Greifer außerhalb des Formspannraums R, wobei am einen Haltesystem 26a die Platine angeordnet ist. Im Werkzeug selbst befindet sich das soeben 5 -In Figs. 1-4 the mode of operation is shown. Via a transfer device 29, a flat board 17 made of material that is flowable during deep drawing is transferred into an engagement space 28 between the parts 12a, 12b of the mold 12. The transfer device 22 has a gripper 26 with two holding systems 26a, 26b. In Fig. 1, the gripper is located outside the mold clamping space R, the circuit board being arranged on a holding system 26a. This is just in the tool itself 5 -
tiefgezogene und umspritzte Tiefziehteil 27. Die Tiefzieheinrichtung 20 befindet sich dabei in ihrer Ausgangsstellung. Fig. 2 zeigt die nächste Stellung. Zwischen Fig. 1 und Fig. 2 hat die Übergabeeinrichtung 22 die Platine 17 in die Form 12 gebracht, das sich jetzt zwischen den Teilen 12a,12b der Form 12 befindet. Nach Übergabe der Platine 17 an das in Fig. 2 linke Teil 12a mit dem Haltesystem 26a hat der Greifer 26 mit dem Haltesystem 26b auf der gegenüberliegenden Seite, also am Teil 12b das umspritzte Tiefziehteil 27 entnommen, das nun einer zeichnerisch nicht dargestellten Ablage zugeführt werden kann. Der Greifer arbeitet vorzugweise pneumatisch, und ebenso können in der Form 12 Vakuumanschlüsse zum Halten von Platine und umspritztem Tiefziehteil 27 vorgesehen sein.deep-drawn and overmolded deep-drawn part 27. Deep-drawing device 20 is in its initial position. Fig. 2 shows the next position. Between FIGS. 1 and 2, the transfer device 22 has brought the board 17 into the mold 12, which is now located between the parts 12a, 12b of the mold 12. After transferring the circuit board 17 to the part 12a on the left in FIG. 2 with the holding system 26a, the gripper 26 with the holding system 26b on the opposite side, that is to say on the part 12b, has removed the overmolded deep-drawn part 27, which is now fed to a storage device, not shown in the drawing can. The gripper preferably works pneumatically, and likewise 12 vacuum connections can be provided in the mold for holding the board and overmolded deep-drawn part 27.
Wie der Spalt 37 zwischen Teil 12a und Teil 12b der Form verdeutlicht, hat in Fig. 2 noch nicht die endgültige Formschlußbewegung stattgefunden. Insofern ist auch die Platine 17 noch nicht tiefgezogen, so daß der Tiefziehraum T noch nicht ausgefüllt ist. Dieser Spalt 37 wird beim nächsten Verfahrensschritt, der in Fig. 3 dargestellt ist, beseitigt. Bei dieser hierfür erforderlichen horizontalen Bewegung des beweglichen Formträgers 11 auf den stationären Formträger 10 zu, erfolgt das Tiefziehen, wobei der Ziehstempel 21 in die Ziehform 19 eindringt, die am Teil 12b der Form angeordnet ist. Die Funktionsweise der Tiefzieheinrichtung ist derartig, daß die von der Schließeinheit C aufgebrachte äußere Kraft innerhalb der Tiefzieheinrichtung in eine Ziehkraft umgesetzt wird, wozu Hydrauli kmedien auf geregelte oder gesteuerte Weise verdrängt werden, so daß sich gegenläufige Bewegungen innerhalb des Werkzeuges ergeben. Diese Vorgehensweise wird u.a. in der EP 0 333 052 Bl beschrieben, deren Offenbarungsgehalt insofern ausdrücklich auch zum Gegenstand der vorliegenden Erfindung gemacht wird. Die prinzipielle Arbeitsweise der Tiefzieheinrichtung 20 wird jedoch im folgenden auch nochmals erläutert.As the gap 37 between part 12a and part 12b of the mold shows, the final form-locking movement has not yet taken place in FIG. 2. In this respect, the board 17 is not yet deep-drawn, so that the deep-drawing space T has not yet been filled. This gap 37 is eliminated in the next process step, which is shown in FIG. 3. With this horizontal movement of the movable mold carrier 11 toward the stationary mold carrier 10 required for this purpose, deep drawing takes place, the drawing die 21 penetrating into the drawing mold 19 which is arranged on the part 12b of the mold. The operation of the deep-drawing device is such that the external force applied by the clamping unit C is converted into a pulling force within the deep-drawing device, for which purpose hydraulic media are displaced in a regulated or controlled manner, so that there are opposing movements within the tool. This procedure is among others in EP 0 333 052 B1, the disclosure content of which is expressly made the subject of the present invention. The basic mode of operation of the deep-drawing device 20 is, however, also explained again below.
Die Tiefzieheinrichtung 20 besitzt einen zentralen Kolben 30, der von einem ringförmigen Arbeitskolben 31 umgeben ist. Zwischen Ar- beitskolben 31 und der Kolbenstange des zentralen Kolbens 30 ist ein Hydraulikraum 41 vorgesehen, der über die Leitung 42 mit Hydraulikmedium versorgt werden kann. Der Arbeitskolben 31 ist von einem Ringkolben 32 umgeben. An den Ringkolben 32 schließt ebenfalls ein Hydraulikraum 43 an, der über Leitung 44 mit Hydraulikmedium beaufschlagbar ist. Zeichnerisch nicht dargestellt sind die entsprechenden Ventile, die eine Ansteuerung und Regelung der Verhältnisse in den Hydraulikräumen 41, 43 ermöglichen. In Fig. 2 ist nun der Arbeitskolben 20 in Anlage am als Zylindergehäuse ausgebildeten Teil 12a gelangt. Ebenso befindet sich die Ziehform 19 mit dem Blechhalter 18 in Anlage. Bei der weiteren Formschlußbewegung bewegt sich das Teil 12a relativ zum Ringkolben 32, der hier über Ziehform 19 und Blechhalter 18 bereits am Teil 12b abgestützt ist. Dadurch wird einerseits der Raum 45 verkleinert, gleichzeitig wird aber das im Hydraulikraum 43 befindliche Hydraulikmedium verdrängt, wobei sich der Hydraulikraum 46 in Fig. 3 mit Hydraulikmedium füllt und den Arbeitskolben 31 nach rechts bewegt. Der Arbeitskolben 31 betätigt den Ziehstempel 21 zum Tiefziehen des Tiefziehteils 16. Die Bewegungen von Ringkolben 32 und Arbeitskolben 31 können ergänzend über die Leitungen 42 und 44 beinflußt werden.The deep-drawing device 20 has a central piston 30 which is surrounded by an annular working piston 31. Between ar- beitskolben 31 and the piston rod of the central piston 30, a hydraulic chamber 41 is provided which can be supplied with hydraulic medium via the line 42. The working piston 31 is surrounded by an annular piston 32. A hydraulic chamber 43 also adjoins the annular piston 32 and can be acted upon by hydraulic medium via line 44. The corresponding valves, which enable control and regulation of the conditions in the hydraulic spaces 41, 43, are not shown in the drawing. 2, the working piston 20 has now come into contact with the part 12a designed as a cylinder housing. The drawing mold 19 is also in contact with the sheet metal holder 18. During the further positive locking movement, the part 12a moves relative to the annular piston 32, which is already supported on the part 12b here via the drawing mold 19 and the sheet metal holder 18. This reduces the space 45 on the one hand, but at the same time displaces the hydraulic medium located in the hydraulic space 43, the hydraulic space 46 in FIG. 3 filling with hydraulic medium and moving the working piston 31 to the right. The working piston 31 actuates the punch 21 for deep drawing the deep-drawn part 16. The movements of the annular piston 32 and the working piston 31 can be additionally influenced via the lines 42 and 44.
In Fig. 3 ist nun das Tiefziehteil 16 erstellt worden. Ein Vergleich zwischen Fig. 2 und Fig. 3 zeigt ferner, daß die Platine 17 ursprünglich einen großen Teil des Formhohlraumes 14 ausgefüllt hat. Beim Tiefziehen dringt der Ziehstempel 21 in den Tiefziehraum T ein und zieht die Ränder der Platine 17 aus dem Formspannraum. Dadurch bildet der Rand 16a des Tiefziehteils 16 jetzt einen Teil der Umrandung des Formhohlraums 14.The deep-drawn part 16 has now been created in FIG. 3. A comparison between FIG. 2 and FIG. 3 further shows that the circuit board 17 originally filled a large part of the mold cavity 14. During deep drawing, the punch 21 penetrates into the deep drawing space T and pulls the edges of the board 17 out of the mold clamping space. As a result, the edge 16a of the deep-drawn part 16 now forms part of the border of the mold cavity 14.
Dies ist erforderlich, um überhaupt eine Verbindung zwischen Kunststoff und Tiefziehteil 16 zu ermöglichen und andererseits ist genau in diesem Bereich auch sicherzustellen, daß der Formhohlraum durch das Tiefziehteil 16 ausreichend abgedichtet ist, so daß überhaupt ein Spritzgießen stattfinden kann. Dieses Spritzgießen ist in Fig. 4 dargestellt, wobei der Formhohlraum 14 mit Kunststoff gefüllt wird, so daß sich das umspritzte Tiefziehteil 27 ergibt. - 7 -This is necessary in order to enable a connection between the plastic and the deep-drawn part 16 at all, and on the other hand it must also be ensured in this area that the mold cavity is sufficiently sealed by the deep-drawn part 16 so that injection molding can take place at all. This injection molding is shown in Fig. 4, wherein the mold cavity 14 is filled with plastic, so that the overmolded deep-drawn part 27 results. - 7 -
In zeichnerisch nicht dargestellter Weise besteht auch die Möglichkeit, daß ein Formhohlraum z.B. am Boden des Tiefziehteils 16 geschaffen wird, der anschließend mit plastifizierbarem Material über den Anguß 33 gefüllt wird.In a manner not shown in the drawing, there is also the possibility that a mold cavity e.g. is created at the bottom of the deep-drawn part 16, which is then filled with plasticizable material via the sprue 33.
Es versteht sich von selbst, daß diese Beschreibung verschiedensten Modifikationen, Änderungen und Anpassungen unterworfen werden kann, die sich im Bereich von Äquivalenten zu den anhängenden Ansprüchen bewegen. It goes without saying that this description can be subjected to various modifications, changes and adaptations which range from equivalents to the appended claims.
Bezugszeichenl iste (kein Bestandteil der AnReference numerals (not part of the An
10 sationärer Formträger10 stationary mold carriers
11 beweglicher Formträger11 movable mold carrier
12 Form12 shape
12a, 12b Teil12a, 12b part
14 Formhohlraum14 mold cavity
16 Tiefziehteil16 deep-drawn part
16a Rand16a margin
17 Platine17 circuit board
18 Blechhalter18 sheet holder
19 Ziehform19 drawing form
20 Tiefzieheinrichtung20 deep-drawing device
21 Ziehstempel21 drawing stamps
22 Übergabeeinrichtung22 transfer device
26 Greifer26 grippers
26a, 26b Haltesystem26a, 26b holding system
27 umspritztes Tiefziehteil27 molded thermoformed part
28 Eingriffsraum28 engagement space
29 Führung29 leadership
30 zentraler Kolben30 central pistons
31 Arbeitskolben31 working pistons
32 Ringkolben32 ring pistons
33 Anguß33 sprue
34, 35 Vakuumanschluß34, 35 vacuum connection
36 Ringkolben36 ring pistons
40 Maschinenfuß40 machine base
41, 43 Hydraul ikraum41, 43 Hydraulic room
42, 44 Leitung42, 44 line
C SchließeinheitC clamping unit
R FormspannraumR mold clamping space
S Spritzgießeinheit
Figure imgf000010_0001
T Tiefziehraum S injection molding unit
Figure imgf000010_0001
T deep drawing room

Claims

Patentansprüche claims
1. Spritzgießmaschine zur Verarbeitung von Kunststoffen und anderer plastifizierbarer Massen mit einer Formschließeinheit zur Herstellung von Tiefziehteilen (16) mit1. Injection molding machine for processing plastics and other plasticizable materials with a mold clamping unit for the production of deep-drawn parts (16) with
- einem stationären Formträger (10),- a stationary mold carrier (10),
- einem beweglichen Formträger (11),- a movable mold carrier (11),
- einem zwischen stationärem Formträger (10) und beweglichem Formträger (11) gebildeten Formspannraum (R) zur Aufnahme der Teile einer Form (12) zur Formung von Tiefziehteilen (16) mittels einer in der Form befindlichen Tiefzieheinrichtung (20),a mold clamping space (R) formed between the stationary mold carrier (10) and the movable mold carrier (11) for receiving the parts of a mold (12) for forming deep-drawn parts (16) by means of a deep-drawing device (20) located in the mold,
- einer Schließeinheit (C) zum zyklischen Öffnen und Schließen der Form unter Bewegung des beweglichen Formträgers (11) auf den stationären Formträger (10) zu und von diesem weg,a closing unit (C) for cyclically opening and closing the mold while moving the movable mold carrier (11) towards and away from the stationary mold carrier (10),
- einer Spritzgießeinheit (S) zur Aufbereitung von plastifizierbarem Material , dadurch gekennzeichnet, daß in der Form (12) neben der Tiefzieheinrichtung zum zyklusweisen Tiefziehen von Tiefziehteilen (16) ein Formhohlraum ausgebildet ist und daß ein Tiefziehteil in dieser Form (12) beim im gleichen Zyklus erfolgenden Einspritzen von plastifizierbarem Material zumindest teilweise im Formhohlraum (14) und diesen abdichtend angeordnet ist.- An injection molding unit (S) for processing plasticizable material, characterized in that a mold cavity is formed in the mold (12) in addition to the deep-drawing device for the cyclical deep-drawing of deep-drawn parts (16) and that a deep-drawn part in this form (12) in the same Cycle injection of plasticizable material at least partially in the mold cavity (14) and this is arranged sealingly.
2. Spritzgießmaschine nach Anspruch 1 dadurch gekennzeichnet, daß die Tiefzieheinrichtung (20) dem am beweglichen Formträger (11) angeordneten Teil (12a) der Form (12) zugeordnet ist, und daß der Formhohlraum (14) nach dem Tiefziehen bei Formschluß im selben Arbeitszyklus zwischen dem Teil (12a) und dem am stationären Formträger (10) angeordneten Teil (12b) der Form gebildet ist.2. Injection molding machine according to claim 1, characterized in that the deep-drawing device (20) is assigned to the part (12a) of the mold (12) arranged on the movable mold carrier (11), and that the mold cavity (14) after deep-drawing with positive locking in the same working cycle is formed between the part (12a) and the part (12b) of the mold arranged on the stationary mold carrier (10).
3. Spritzgießmaschine nach Anspruch 1, dadurch gekennzeichnet, daß eine Platine (17), aus der mittels der Tiefzieheinrichtung (20) das Tiefziehteil (16) tiefgezogen wird, nach dem Tiefziehen den Formhohlraum (12) begrenzt. 3. Injection molding machine according to claim 1, characterized in that a circuit board (17), from which the deep-drawn part (16) is deep-drawn by means of the deep-drawing device (20), delimits the mold cavity (12) after the deep-drawing.
4. Spritzgießmaschine nach Anspruch 1, dadurch gekennzeichnet, daß die Tiefzieheinrichtung (20) beim Tiefziehen in einen Tiefziehraum (T) eindringt, neben dem sich der Formhohlraum (14) ausbildet.4. Injection molding machine according to claim 1, characterized in that the deep-drawing device (20) penetrates into a deep-drawing space (T) during deep-drawing, next to which the mold cavity (14) is formed.
5. Spritzgießmaschine nach Anspruch 1, dadurch gekennzeichnet, daß eine Übergabeeinrichtung (22) vorgesehen ist, deren Greifer (26) zwei Haltesysteme (26a, 26b) aufweist, und in einem Zyklus bei einmaligem Öffnen der Form (13) mit dem einen Haltesystem die Platine (17) an die Tiefzieheinrichtung (20) übergibt und das umspritzte Tiefziehteil (16) aus der Ziehform (19) mit dem anderen Haltesystem (26b) entnimmt. 5. Injection molding machine according to claim 1, characterized in that a transfer device (22) is provided, the gripper (26) of which has two holding systems (26a, 26b), and in one cycle when the mold (13) is opened once with the one holding system Passes the board (17) to the deep-drawing device (20) and removes the overmolded deep-drawn part (16) from the drawing mold (19) with the other holding system (26b).
PCT/EP1999/001867 1998-03-24 1999-03-20 Injection moulding machine for producing deep-drawn parts WO1999048665A1 (en)

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