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WO2005118253A1 - Ensemble ejecteur ou coulisseau - Google Patents

Ensemble ejecteur ou coulisseau Download PDF

Info

Publication number
WO2005118253A1
WO2005118253A1 PCT/EP2005/002012 EP2005002012W WO2005118253A1 WO 2005118253 A1 WO2005118253 A1 WO 2005118253A1 EP 2005002012 W EP2005002012 W EP 2005002012W WO 2005118253 A1 WO2005118253 A1 WO 2005118253A1
Authority
WO
WIPO (PCT)
Prior art keywords
ejector
pressure
slide
pump
pressure accumulator
Prior art date
Application number
PCT/EP2005/002012
Other languages
German (de)
English (en)
Inventor
Jörg Dantlgraber
Original Assignee
Bosch Rexroth Ag
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 Bosch Rexroth Ag filed Critical Bosch Rexroth Ag
Publication of WO2005118253A1 publication Critical patent/WO2005118253A1/fr

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
    • B29C45/76—Measuring, controlling or regulating
    • B29C45/82—Hydraulic or pneumatic circuits
    • 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
    • B29C45/4005—Ejector constructions; Ejector operating mechanisms
    • 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
    • B29C2045/1784—Component parts, details or accessories not otherwise provided for; Auxiliary operations not otherwise provided for
    • B29C2045/1785—Movement of a part, e.g. opening or closing movement of the mould, generating fluid pressure in a built-in fluid pressure generator
    • 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
    • B29C45/76—Measuring, controlling or regulating
    • B29C45/82—Hydraulic or pneumatic circuits
    • B29C2045/822—Pneumatic circuits
    • 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
    • B29C45/76—Measuring, controlling or regulating
    • B29C45/82—Hydraulic or pneumatic circuits
    • B29C2045/824—Accumulators
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76494—Controlled parameter
    • B29C2945/76498—Pressure
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76494—Controlled parameter
    • B29C2945/76568—Position
    • B29C2945/76571—Position start position
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76494—Controlled parameter
    • B29C2945/76568—Position
    • B29C2945/76581—Position distance
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76655—Location of control
    • B29C2945/76719—Ejection unit
    • B29C2945/76722—Ejection unit ejectors
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76655—Location of control
    • B29C2945/76775—Fluids
    • B29C2945/76785—Fluids hydraulic fluids
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76929—Controlling method
    • B29C2945/76956—Proportional

Definitions

  • the invention relates to an ejector or slide arrangement for an injection molding machine according to the preamble of claim 1.
  • ejector or slide assemblies in injection molding machines are operated either purely mechanically, hydraulically or electronically with the aid of electrical drives and cooperate with tool-side ejectors to eject molded parts after injection molding and opening the tool, or operate slides to demold the undercut molded part can.
  • DE 101 21 024 AI of the applicant an ejector arrangement is shown with FIGS. 27 to 30, in which the actuation of an ejector guided in a movable tool clamping plate takes place electromechanically.
  • An ejector is connected to an axially displaceable spindle which is in engagement with a spindle nut which in turn is driven by an electric drive. By actuating the spindle nut, the ejector can be moved from its retracted position to its ejector position.
  • Such a construction can also be used in slide arrangements or the like.
  • the invention has for its object to provide an ejector or slide arrangement, in particular for an injection molding machine, which is compact with minimal outlay on equipment.
  • This object is achieved by an ejector or slide arrangement with the features of claim 1.
  • the ejector or slide is actuated hydraulically by applying pressure from a high-pressure accumulator to it or to an actuating element connected to it.
  • the high-pressure accumulator is charged via a pump, which charges the high-pressure accumulator as a function of a stroke of the injection molding machine.
  • this pump is designed as a plunger pump, which is actuated, for example, by the stroke of a movable platen of an injection molding machine and whose pumping chamber has a low-pressure accumulator via a suction valve and a pump valve via a High pressure accumulator is connected.
  • This means that the hydraulic drive of the ejector / slide is designed as a closed circuit, pressure medium being sucked in from a low-pressure accumulator and fed to a high-pressure accumulator under pressure.
  • Such a hydraulic circuit does not require an external, electrically driven pump and can be integrated into the injection molding machine without the hydraulic function being recognizable from the outside.
  • the hydraulic connection of the high-pressure accumulator and the low-pressure accumulator to a pressure chamber accommodating the ejector / slide or its actuating element is preferably carried out via a proportionally adjustable directional valve which connects the low-pressure accumulator to the pressure chamber in a basic position and controls the connection to the high-pressure accumulator in its control positions.
  • a pressure relief valve can be provided, which opens a connection from the high pressure branch to the low pressure branch when a maximum pressure is reached, or a plunger or plunger cylinder of the plunger pump can be supported in the axial direction by a preloaded spring. This spring deflects when the intended maximum pressure is reached, so that a further pressure build-up is not possible.
  • the actuating element, the ejector and / or slide can be designed as a piston in a single-acting or double-acting cylinder, the piston being integrally connected to the slide / ejector or being indirectly operatively connected to it.
  • Figure 1 is a functional diagram of an ejector arrangement of an injection molding machine
  • FIG. 2 shows a variant of the ejector arrangement from FIG. 1.
  • FIG. 1 shows a functional diagram of the ejector arrangement 1 of an injection molding machine. This has a frame 2 on which a fixed
  • Tool platen 6 are stored. The latter is guided displaceably via spars of the frame 2, which are not shown, and can be displaced via a locking unit, also not shown, which acts either mechanically (toggle lever), hydraulically (hydraulic cylinder), electromechanically or as a hybrid drive (electromechanically / hydraulically).
  • This locking unit is supported on a support plate 8 of the frame 2.
  • ejectors or slides of the tool are actuated via one or more actuating elements 10, which are mounted on the movable platen 6.
  • these actuating elements 10 have a single-acting cylinder 12, in which an ejector or piston with a piston collar 14 and a piston rod 16 is guided in an axially displaceable manner.
  • a spring 18 is arranged, via which the ejector is biased into a basic position. In this basic position, the piston rod 16 is retracted into the platen 6 - the tool-side ejector or slide is not actuated.
  • the piston collar 14 and the cylinder 12 enclose a pressure chamber 20 which is connected via a pressure line 22 to an outlet port B of a proportionally adjustable directional valve 24. This is biased by a spring into a basic position in which the working connection B is connected to a working connection A. A low-pressure line 26 is connected to this, which opens into a suction line 28. This connects a low-pressure accumulator ND to a suction valve 29, which enables a pressure medium flow from the low-pressure accumulator ND to a line 31 connecting the outlet of the suction valve 29 to a connection of the plunger pump 30.
  • the filling valve 40 opens in the direction of the high-pressure accumulator HD.
  • the plunger pump 30 has a fixed plunger 32 which is supported on the support plate 8 and a plunger cylinder 34 which is mounted on the movable platen 6 and into which the plunger 32 is immersed.
  • the plunger cylinder 34 and the plunger 32 delimit a pump chamber 36 which has a maximum volume in the closed position of the tool 38 indicated by the broken line.
  • An input or pressure port P of the proportionally adjustable directional valve 24 is connected to the filling line 38 via a line 42.
  • a pressure limiting line 44 branches off from the filling line 38 and leads to a section of the suction line 28 between the suction valve 29 and the low-pressure accumulator ND.
  • a pressure limiting valve 46 is arranged in the pressure limiting line 44 and is acted upon in its closed position by the force of a spring and in its open position by the pressure in the filling line 38, which is tapped via a control line 48.
  • the spring of the pressure relief valve 46 is set such that the high-pressure accumulator HD can be charged to a pressure sufficient for the function of the ejector.
  • the plunger 32 plunges deeper into the pump chamber 36 so that pressure medium from this pump chamber 36 via the opening filling valve 40 in the high-pressure accumulator HD is promoted - the accumulator is charged.
  • the directional control valve 24 is controlled via a control unit of the injection molding machine in such a way that the ejector extends according to a predetermined path or force curve and in the process actuates the tool-side ejector to eject the molded part from the opened tool.
  • the ejector is retracted into the platen 6 by switching the directional valve 24 into its basic position, in which the pressure chamber 20 is connected to the low-pressure accumulator ND via the pressure line 22, the directional valve 24 and the low-pressure line 26.
  • the ejector is moved back into its illustrated basic position by the force of the spring 18, in which it does not, for example, on one shown stop is present. In the case of a double-acting cylinder 12, this return movement takes place hydraulically.
  • the pump chamber 36 is reduced, so that the pressure in the pump chamber 36 increases with increasing opening travel and the high-pressure accumulator HD is charged via the filling valve 40 and the filling line 38.
  • the pressure-limiting valve 46 opens the connection between the filling line 38 and the suction line 29, so that the pressure peak is reduced to the low-pressure accumulator ND.
  • the clamping unit (not shown) is activated in the opposite direction, so that the tool clamping plate 6 moves to the right.
  • the pump chamber 36 is enlarged and pressure medium is drawn into the pump chamber 36 from the low-pressure accumulator ND via the suction line 28 and the suction valve 29.
  • an injection unit 50 which is displaceably mounted on the frame 2 of the injection molding machine with a screw 52, a screw drive 54 and a filling funnel 56 is brought into contact with a nozzle (not shown) in the fixed mold platen 4 and the homogenized melt is brought into the cavity of the closed tool 39 injected.
  • the tool 39 is opened in the manner described above and the ejectors are actuated to eject the molded part - the cycle starts again.
  • the very compact closed hydraulic circuit with only two comparatively small valves 24, 46 and the two memories HD, ND can be integrated very compactly into the injection molding machine.
  • the proportionally controlled directional valve 24 makes it possible to control the stroke of the ejector or a slide in the predetermined manner, so that even complex tasks can be solved.
  • FIG. 2 shows an exemplary embodiment in which the hydraulic circuit of the ejector arrangement is further simplified.
  • the exemplary embodiment shown in FIG. 2 largely corresponds to the previously described exemplary embodiment and also has two memories HD, ND, which are connected to a connection of a plunger pump 30.
  • the piston rod 16 of the ejector is extended by connecting the high-pressure accumulator HD via the proportionally adjustable directional valve 24 to the pressure chamber 20 of the cylinder 12. To relieve the pressure on the ejector, this pressure chamber 20 is connected to the suction line 28.
  • Pressure relief valve 46 is limited but by a resilient support of the plunger 32 on the support plate 8.
  • the plunger 32 passes through the support plate and dips with a radially widened end section 58 into a spring chamber 60, in which a prestressed
  • Support spring 62 is supported, which engages the end portion 58 of the plunger 32.
  • the pretensioning of the support spring 62 is selected such that when the maximum pressure in the pump chamber 36 of the plunger pump 30 is exceeded, the plunger 32 can deflect to the left against the force of the support spring 62 during the ascending movement of the movable tool clamping plate 6, so that this maximum pressure is not exceeded and thus the high pressure accumulator HD is protected against overload. Otherwise the function corresponds to
  • a double-acting cylinder can also be used, in which the extension and retraction takes place by connecting the pressure chambers to the high-pressure accumulator HD or the low-pressure accumulator ND.
  • an ejector or slide arrangement in particular for an injection molding machine or another machine for processing plastics, with at least one ejector or slide, which can be moved from a retracted position into an ejector position via a drive.
  • the ejector or an actuating element of the ejector / slide is actuated hydraulically by connecting it to pressure from a high-pressure accumulator via a directional valve.

Landscapes

  • 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

L'invention concerne un ensemble éjecteur ou coulisseau (1) conçu en particulier pour une presse d'injection, ou une machine analogue utilisée pour le traitement des plastiques, comprenant au moins un éjecteur ou coulisseau qui peut être déplacé par l'intermédiaire d'un entraînement, d'une position de retrait vers une position d'éjection. L'éjecteur ou un élément d'actionnement (10) de l'éjecteur/du coulisseau est actionné hydrauliquement par application d'une pression issue d'un réservoir haute pression (HD), par l'intermédiaire d'un tiroir de distribution (24).
PCT/EP2005/002012 2004-06-04 2005-02-25 Ensemble ejecteur ou coulisseau WO2005118253A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004027280.8 2004-06-04
DE200410027280 DE102004027280A1 (de) 2004-06-04 2004-06-04 Auswerfer- oder Schieberanordnung

Publications (1)

Publication Number Publication Date
WO2005118253A1 true WO2005118253A1 (fr) 2005-12-15

Family

ID=34961833

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2005/002012 WO2005118253A1 (fr) 2004-06-04 2005-02-25 Ensemble ejecteur ou coulisseau

Country Status (2)

Country Link
DE (1) DE102004027280A1 (fr)
WO (1) WO2005118253A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007018664A1 (de) * 2007-04-20 2008-10-23 Bayerische Motoren Werke Aktiengesellschaft Verfahren zum Erzeugen und Bereitstellen unterschiedlicher Druck-Niveaus eines Fluids, insbesondere von Druckluft im autombilen Einsatzbereich
EP3023221B1 (fr) 2011-01-28 2018-09-12 Husky Injection Molding Systems Ltd. Machine à mouler présentant un ensemble auxiliaire d'assistance à l'éjection configuré pour appliquer une force d'éjection supplémentaire

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8301434U1 (de) * 1983-01-20 1984-10-11 Kueffner-Technologie Verfahren Zur Rationalisierung In Der Kunststoffindustrie Dipl.-Ing. (Fh) Gerhard Kueffner, 8500 Nuernberg, De Vorrichtung zum steuern von arbeitsablaeufen von an formmaschinen, wie spritzgiessmaschinen, presse u.a, vorgesehenen entnahme- und/oder einlegegeraeten
JPH03234507A (ja) * 1990-02-09 1991-10-18 Matsuji Nakagome プラスチックス成形用金型
JPH04323016A (ja) * 1991-04-23 1992-11-12 Kyowa Kogyo Kk 圧力制御成形法とその装置
JPH0825368A (ja) * 1994-07-21 1996-01-30 Ikegami Kanagata Kogyo Kk 蓄圧動力発生装置を備えた金型
WO2001089801A1 (fr) * 2000-05-23 2001-11-29 Bosch Rexroth Ag Dispositif d'entrainement, notamment pour l'unite de verrouillage, l'unite d'injection ou l'unite d'ejection d'une presse d'injection de matiere plastique

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8301434U1 (de) * 1983-01-20 1984-10-11 Kueffner-Technologie Verfahren Zur Rationalisierung In Der Kunststoffindustrie Dipl.-Ing. (Fh) Gerhard Kueffner, 8500 Nuernberg, De Vorrichtung zum steuern von arbeitsablaeufen von an formmaschinen, wie spritzgiessmaschinen, presse u.a, vorgesehenen entnahme- und/oder einlegegeraeten
JPH03234507A (ja) * 1990-02-09 1991-10-18 Matsuji Nakagome プラスチックス成形用金型
JPH04323016A (ja) * 1991-04-23 1992-11-12 Kyowa Kogyo Kk 圧力制御成形法とその装置
JPH0825368A (ja) * 1994-07-21 1996-01-30 Ikegami Kanagata Kogyo Kk 蓄圧動力発生装置を備えた金型
WO2001089801A1 (fr) * 2000-05-23 2001-11-29 Bosch Rexroth Ag Dispositif d'entrainement, notamment pour l'unite de verrouillage, l'unite d'injection ou l'unite d'ejection d'une presse d'injection de matiere plastique

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 016, no. 016 (M - 1200) 16 January 1992 (1992-01-16) *
PATENT ABSTRACTS OF JAPAN vol. 017, no. 155 (M - 1388) 26 March 1993 (1993-03-26) *
PATENT ABSTRACTS OF JAPAN vol. 1996, no. 05 31 May 1996 (1996-05-31) *

Also Published As

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