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WO2007003452A1 - Module d'injection electrique pour machine de moulage par injection - Google Patents

Module d'injection electrique pour machine de moulage par injection Download PDF

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Publication number
WO2007003452A1
WO2007003452A1 PCT/EP2006/061813 EP2006061813W WO2007003452A1 WO 2007003452 A1 WO2007003452 A1 WO 2007003452A1 EP 2006061813 W EP2006061813 W EP 2006061813W WO 2007003452 A1 WO2007003452 A1 WO 2007003452A1
Authority
WO
WIPO (PCT)
Prior art keywords
injection
crank
unit according
piston
injection unit
Prior art date
Application number
PCT/EP2006/061813
Other languages
German (de)
English (en)
Inventor
Walter Wohlrab
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
Publication of WO2007003452A1 publication Critical patent/WO2007003452A1/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
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/53—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston
    • B29C45/531—Drive means therefor
    • 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
    • B29C2045/466—Means for plasticising or homogenising the moulding material or forcing it into the mould supplying the injection unit directly by a compounder

Definitions

  • the present invention relates to an electric injection unit for an injection molding machine according to the preamble of claim 1.
  • Injection units for injection molding machines are well known from the prior art.
  • An outdated injector is described in US 2,367,204.
  • a plastic material is filled in a funnel and melted by supplying heat.
  • two alternately reciprocating pistons push the melt toward the mold.
  • the pistons are acted upon by means of an eccentric, which has a freewheel in one direction of rotation.
  • a plastic starting material (granules or powder) is melted in a plasticizing unit by turning a plasticizing screw and the plastic melt is then injected through the piston-like actuated plasticizing screw into the cavity of a molding tool. Possibly. the melting can also be done otherwise. In most cases, this screw can thereby be moved axially, so that the plastic material accumulating in the screw antechamber starting material is transferred by an injection stroke at Nachvomelie the screw in the vorgeagte cavity.
  • German Patent Specification 1 091 744 describes a device in which an eccentric driven by means of a motor-gear combination realizes the axial movement of a plasticizing and injection screw via a lever mechanism.
  • a double crank drive is also used for the axial feed of a plasticizing screw. In this case, however, engages a first tab on a rotating first crank and a second tab on a counterclockwise to the first crank revolving second crank.
  • WO 01/85429 A1 in turn describes an injection molding apparatus in which the axial feed of a plasticizing screw is determined by means of a motor-driven eccentric.
  • injection units for injection molding machines in which the device for the plasticization is separated from the injection device.
  • the melting of the starting material takes place in an upstream step, for example in an extruder.
  • the material is then supplied, for example, a piston-cylinder unit, from which it is introduced into the cavity.
  • the plasticizing unit may be configured in the form of a single-shaft extruder or a two-shaft extruder.
  • the extruder storage devices may be provided, in which the melt material can be temporarily accumulated, so that, for example, in a discontinuous injection molding machine, the extruder can be operated continuously, and during the injection process, the material melted in the extruder is cacheable.
  • the piston-cylinder device (hereinafter also referred to as a shot pot) is usually driven hydraulically.
  • the starting point is the basic principle of an injection device divided after plastification and injection.
  • a plasticizing unit for generating the molten material is initially provided.
  • This plasticizing unit is rotationally driven by means of a drive device, preferably an electric drive device.
  • the electric drive device is an electric motor which can either be connected directly to the plasticizing screw (eg high-torque motor) or without the interposition of a gearbox, or else is connected to the plasticizing screw (s) via the intermediary of a gearbox.
  • a piston-cylinder injection device is provided, which is in flow communication with the plasticizing or can be brought and receives from this the material melt.
  • the piston in the piston-cylinder device is movable back and forth, with the plastic melt can accumulate in the cylinder when moving back the piston.
  • the piston By Nachvomeschieben the piston then the melt can be transferred into the cavity of a tool, not shown, a closing unit.
  • a core idea of the present invention resides in the fact that the piston-cylinder injection device can likewise be driven electrically by means of a double crank device which is directly or indirectly connected to the piston via at least one connecting link of the first type and which is connected thereto. and can move.
  • the double crank mechanism is connected to the electric motor that drives them.
  • crank device per se allows for appropriate operation, a power-optimal implementation of the rotary drive in a linear motion.
  • a power-optimal implementation of the rotary drive in a linear motion for example, resorted to a principle as it is already addressed in DE 203 14443 U1 for the locking device.
  • the stroke can be doubled compared to the normal crank mechanism.
  • a connection tab of the second type is provided, wherein the connection tab of the first type establishes an indirect or direct connection between the crank drive and the piston and the connection tab of the second type establishes the connection between the crank drive and a support device.
  • the crank mechanism must also be designed to be movable back and forth, wherein it is preferably arranged on a sliding device on a machine bed.
  • the injection plate can move on a slide of the aforementioned machine frame already mentioned.
  • tension elements for example, Glasholme - be provided, as known from the field of clamping units are.
  • the cylinder of the injector can be attached to a plate, in which case the plate for fastening the towbar serves.
  • the crank device may have one or more crank or crank disks, which is rotationally driven by means of the drive.
  • the connecting straps either first or second type, of which one or more copies arranged in parallel to one another can also be provided, are then articulated eccentrically on the crank or the crank disk. If a double crank mechanism is provided, the two crank tabs with the same eccentricity can be articulated diametrically opposite to the crank disk.
  • the crank mechanism also has according to a preferred embodiment, a parallel to the crank pulley aligned and fixedly connected to this gear, which is in engagement with the drive motor.
  • a gear worm can be arranged on the output shaft of the drive motor, which is in engagement with the gear. In this way, it is also possible to generate large forces or moments via the crank mechanism.
  • a high-torque motor can be provided integrally with the crank mechanism, which then can do without a gearbox.
  • An advantage of the present design is the all-electric design of the injection unit both in the plasticizing unit as also in the area of the piston-cylinder injection device. Since the power transmission takes place, for example, via the double-crank drive, a relatively constant travel speed can be achieved over the initial travel range of the piston. In the end of the piston, the speed slows down. However, the injection force increases.
  • the injection speed can be controlled in particular on the speed of the drive motor, the injection and dynamic pressure is absorbed by a sensor, this signal can also be included in the scheme. Overall, so can be achieved over about 75% of the injection path, a linear velocity curve for the piston with a power boost at the stroke end. This provides a high injection current and a boost phase at the end of the movement with a high injection pressure. Overall, can be achieved with the present invention, due to the cost-effective components and the high number of identical parts, a cost-effective unit, which can be dispensed in particular to cost-intensive and vulnerable ball screws or planetary roller screws. For the drive you can use a standard (synchronous) motor, which is also available inexpensively. In addition, the pressure volume control can be achieved inexpensively.
  • the pre-plasticization can be provided with a constant L / D ratio, so that the plasticizing unit can be adapted very well to the plasticizing requirement. Moreover, no backflow lock is required in the injection area. Overall, a flexible adaptation of volume and pressure can be achieved separately from the plasticizing unit.
  • the drawing shows a schematic embodiment of an electrical injection unit according to the invention.
  • the present electrical injection unit comprises a separate plasticizing and injecting unit.
  • the injection unit has a relative to the injection cylinder 8 fixed plate 1, to which the injection cylinder 8 is fixed.
  • the injection cylinder 8 has a cylinder space in which a piston 9 is reciprocally received and stored.
  • the cylinder chamber is connected via a hot runner system 14 with the later to be described plasticizing unit.
  • a check valve 14 ' is arranged, which prevents melt during injection can flow back to the (later to be explained) plasticization.
  • a channel to an injection nozzle at the top of the injection cylinder 8 is provided, via which the plastic melt received in the cylinder chamber can be injected by means of the piston 9 into a cavity of a tool, not shown.
  • the injection channel still has a switchable nozzle closure 15, so that leakage of melt from the cylinder space can be actively prevented.
  • the fixed plate 1 is connected via Switzerlandholme 3 with a arranged on the right side of the image support plate 2.
  • the recorded in the cylinder chamber piston 9 is fixed at its rear end to an injection plate 5, on the other side of a connecting tab of the first type 18 is hinged.
  • the connecting strap of the first type 18 is pivotally coupled at its other end to the crank disk 16 of a crank mechanism 4. With the same eccentricity diametrically opposite to the crank disc, one end of a connecting strap of the second type 18 'is coupled, the other end of which is hinged (reference numeral 17) to the supporting plate 2.
  • the crank mechanism 4 is thus arranged between the support plate 2 and the injection plate 5.
  • a corresponding number of crank disks is then also provided or the crank disk are suitable form.
  • crank mechanism 4 as well as the injection plate 5 on two mutually parallel rails T on the machine bed via Gleitf ⁇ ße 7 slidably mounted.
  • crank mechanism 4 On the housing of the crank mechanism 4, two electric motors 21 and 22 are attached. Both electric motors 21, 22 have output shafts on which gears (or worms) are arranged, which mesh with a corresponding (not shown) gear of the crank mechanism 4. From the gear, the force or torque is then transferred to the fixedly connected crank pulley 16 or crank disks.
  • the plasticizer has a plasticizing extruder with a cylinder 10 and a plasticizing screw 11.
  • the plasticizing screw 11 is rotatably arranged in the plasticizing cylinder 10.
  • the drive is rotationally driven by a motor 13 coupled via a coupling at the end of the plasticizing screw.
  • the coupling is received in a housing 12 with a bearing.
  • the plasticizing unit is supported by two bearing elements on the towbar 3 which extends between the fixed plate and the support plate 2.
  • the plasticizing screw 11 By driving the motor 13, the plasticizing screw 11 is set in the plasticizing cylinder 10 in rotation, whereby the over the feed hopper filled starting granules is melted in the plasticizing and conveyed forward.
  • the plastic melt enters the cylinder chamber of the cylinder 8, wherein the cylinder piston 9 is retracted under controlled maintenance of a certain back pressure.
  • the retraction is carried out by the regulated drive of the two electric motors 21 and 22, which put the crank disc 16 in rotation via the aforementioned transmission.
  • the injection plate 5 By the rotation of the crank disk 16, the injection plate 5 is retracted together with the injection piston 9 with appropriate articulations of the connecting plates 18 and 18 ', whereby plastic melt can accumulate in the antechamber.
  • crank disc was rotated when returning over about 120 °, so takes place during the first 75% of the rotation in the opposite direction, ie over the first 90 °, a Nachvomeverschieben the piston at a fairly uniform speed.
  • the injection speed is relatively high. Only during the last 30 ° of the rotation of the crank disc slows the rotational speed, but a force gain, the corresponding leverage occurs.
  • both the crank mechanism 4 and the injection plate 5 move backwards.
  • the plates 1 and 2 remain fixed relative to the machine bed.
  • a force sensor 19 may be arranged, which detects the force in the front dead center region. In this way, the injection pressure and the emphasis can be recorded and also regulated.
  • a corresponding control and regulation for an adequate operation of the motors 13, 21 and 22 is provided. Depending on the sensor used and the corresponding information can be given to the controller and thus a control can be performed in the desired manner.
  • the present invention provides a simple possibility for a fully electric construction of an injection unit. If one uses a corresponding crank drive with identically constructed connecting straps on the closing side, then standardized parts can be used, which has a particularly favorable effect on the production costs.

Landscapes

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

Abstract

La présente invention concerne un module d'injection électrique destiné à une machine de moulage par injection. Le module d'injection comprend une unité de plastification pour produire une matière en fusion, un mécanisme d'injection piston-cylindre qui est ou peut être mis en liaison fluidique avec l'unité de plastification de laquelle il reçoit la matière en fusion, le piston pouvant effectuer un mouvement alternatif par l'intermédiaire d'un mécanisme d'entraînement. Le mécanisme d'entraînement présente au moins un système de double vilebrequin.
PCT/EP2006/061813 2005-06-30 2006-04-25 Module d'injection electrique pour machine de moulage par injection WO2007003452A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005030425.7 2005-06-30
DE200510030425 DE102005030425B4 (de) 2005-06-30 2005-06-30 Elektrisches Einspritzaggregat für eine Spritzgießmaschine

Publications (1)

Publication Number Publication Date
WO2007003452A1 true WO2007003452A1 (fr) 2007-01-11

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2006/061813 WO2007003452A1 (fr) 2005-06-30 2006-04-25 Module d'injection electrique pour machine de moulage par injection

Country Status (3)

Country Link
DE (1) DE102005030425B4 (fr)
TW (1) TW200702143A (fr)
WO (1) WO2007003452A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013008137B4 (de) 2013-05-14 2017-02-09 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Probennahmevorrichtung und Verfahren zur Entnahme einer Probenmenge aus einem Schmelzestrom

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE469994C (de) * 1927-12-04 1929-01-02 Eckert & Ziegler G M B H Spritzgussmaschine
CH409375A (de) * 1963-03-25 1966-03-15 Battenfeld Geb Spritzgussmaschine mit Kniehebel
US4678420A (en) * 1984-02-06 1987-07-07 Inoue-Japax Research Incorporated Injection molding machine with auxiliary packing means
JPH0453719A (ja) * 1990-06-22 1992-02-21 Fanuc Ltd 電動式射出成形機の射出部
JPH0847944A (ja) * 1994-08-05 1996-02-20 M M Nakagawa Kk 射出成形機の射出機構
EP0962297A2 (fr) * 1998-05-04 1999-12-08 Battenfeld GmbH Dispositif pour actionner un élément de moulage par injection
DE20314443U1 (de) * 2002-11-14 2004-04-15 Netstal-Maschinen Ag Antriebssystem für eine Spritzgießmaschine, sowie Druckgießmaschine mit einem solchen Antriebssystem

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2367204A (en) * 1943-03-10 1945-01-16 Chrysler Corp Plastic injecting apparatus
DE1091744B (de) * 1956-11-13 1960-10-27 Ankerwerk Gebrueder Goller Spritzgiessmaschine fuer thermoplastische Kunststoffe
AT404918B (de) * 1997-03-03 1999-03-25 Engel Gmbh Maschbau Doppelkurbeltrieb
ATE338622T1 (de) * 2000-05-08 2006-09-15 Procontrol Ag Spritzgiessmaschine mit exzenterantrieb
DE10156522B4 (de) * 2001-11-16 2005-07-21 Krauss-Maffei Kunststofftechnik Gmbh Spritzgießcompounder

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE469994C (de) * 1927-12-04 1929-01-02 Eckert & Ziegler G M B H Spritzgussmaschine
CH409375A (de) * 1963-03-25 1966-03-15 Battenfeld Geb Spritzgussmaschine mit Kniehebel
US4678420A (en) * 1984-02-06 1987-07-07 Inoue-Japax Research Incorporated Injection molding machine with auxiliary packing means
JPH0453719A (ja) * 1990-06-22 1992-02-21 Fanuc Ltd 電動式射出成形機の射出部
JPH0847944A (ja) * 1994-08-05 1996-02-20 M M Nakagawa Kk 射出成形機の射出機構
JP3432011B2 (ja) * 1994-08-05 2003-07-28 エム・エム中川株式会社 射出成形機の射出機構
EP0962297A2 (fr) * 1998-05-04 1999-12-08 Battenfeld GmbH Dispositif pour actionner un élément de moulage par injection
DE20314443U1 (de) * 2002-11-14 2004-04-15 Netstal-Maschinen Ag Antriebssystem für eine Spritzgießmaschine, sowie Druckgießmaschine mit einem solchen Antriebssystem

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section Ch Week 199214, Derwent World Patents Index; Class A32, AN 1992-110677 *
DATABASE WPI Section Ch Week 200351, Derwent World Patents Index; Class A32, AN 1996-166682 *
DR. WERNER HOFMANN: "Rubber technology handbook", 1994, HANSER/GARDNER PUBLICATIONS, CINCINNATI, OHIO, XP002392441 *
PATENT ABSTRACTS OF JAPAN vol. 016, no. 242 (M - 1259) 3 June 1992 (1992-06-03) *
PATENT ABSTRACTS OF JAPAN vol. 1996, no. 06 28 June 1996 (1996-06-28) *

Also Published As

Publication number Publication date
DE102005030425A1 (de) 2007-01-04
TW200702143A (en) 2007-01-16
DE102005030425B4 (de) 2008-06-05

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