WO2001038068A1 - Unite de fermeture de moule pour machine de moulage par injection - Google Patents

Unite de fermeture de moule pour machine de moulage par injection Download PDF

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Publication number
WO2001038068A1
WO2001038068A1 PCT/EP2000/011210 EP0011210W WO0138068A1 WO 2001038068 A1 WO2001038068 A1 WO 2001038068A1 EP 0011210 W EP0011210 W EP 0011210W WO 0138068 A1 WO0138068 A1 WO 0138068A1
Authority
WO
WIPO (PCT)
Prior art keywords
drive unit
mold
support element
linear movement
closing
Prior art date
Application number
PCT/EP2000/011210
Other languages
German (de)
English (en)
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 WO2001038068A1 publication Critical patent/WO2001038068A1/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
    • B29C45/64—Mould opening, closing or clamping devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/64—Mould opening, closing or clamping devices
    • B29C45/66—Mould opening, closing or clamping devices mechanical
    • 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
    • B29C2045/1792—Machine parts driven by an electric motor, e.g. electric servomotor
    • B29C2045/1793—Machine parts driven by an electric motor, e.g. electric servomotor by an electric linear motor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/64—Mould opening, closing or clamping devices
    • B29C2045/645—Mould opening, closing or clamping devices using magnetic means

Definitions

  • the invention relates to a mold-closing unit for an injection molding machine for processing plastics and other plasticizable materials according to the preamble of claim 1.
  • Such a mold clamping unit is e.g. known from EP 0 674 985 A1 or DE 197 50 057 A1.
  • a serial closing of the mold of an injection molding machine takes place, in that a first electromechanical drive unit brings the movable mold carrier up to or almost up to the form closure of the mold to the stationary mold carrier, while a second hydraulic or electromechanical drive unit essentially applies the clamping force required for the production of injection molded parts ,
  • separating means separate the first drive unit from the power flow at a predetermined or predeterminable point in time. The forces both during the movement of the movable mold carrier up to the form closure and when the locking force is applied are always guided via spindles to be dimensioned accordingly.
  • an electromechanical drive unit which has a tube with an internal thread and a shaft with a head with an external thread.
  • Rolling or rolling elements in the form of planets are preferably arranged between the shaft and the linear movement means designed as a tube. are axially fixed against the head and are in operative connection with the two threads of the head and pipe.
  • a further tube is arranged around the shaft and immovable relative to it, which moves into and out of the tube provided with the internal thread when the electromechanical unit moves.
  • the shaft is supported by disc springs so that when the shaft is actuated by a first drive unit, it can move until a higher force is applied, for example by a second drive unit. The shaft can thus be separated from the power flow as required and the forces are transmitted via the two interlocking tubes, a gradual transition from one drive unit to the other is not possible
  • An electromechanical drive is known from DE 195 36 565 A1, in which the parts of a planetary roller threaded spindle are also secured by means of securing means, e.g. Springs are secured against passive turning back. There is a two-stage movement, but the rolling elements are constantly in the flow of force. The second drive unit is only actuated when the first drive unit is secured.
  • mold closing units on plastic injection molding machines are also known, in which at least part of the clamping force is applied electromagnetically.
  • the drive components are not decoupled from the power flow.
  • the present invention is based on the object of providing an alternative drive unit for applying the closing force to a mold closing unit with an essentially two-stage linear movement process.
  • the separating means are preferably on an intermediate element which can be actuated magnetically by the second drive unit, so that the closing force builds up as it moves. Since the magnetic force increases exponentially when the distance between the magnetic plates is reduced, a high closing force can easily be generated. To open and tear open the mold as required, only the polarity needs to be changed so that the first drive unit does not have to be subjected to additional forces.
  • FIG. 1 is a front view of a mold clamping unit located on a machine base
  • Fig. 2 is an enlarged, partially sectioned section of Fig. 1 in
  • FIG. 3, 4 enlarged sections of FIG. 2 in the area of the support element in two exemplary embodiments of the first drive unit.
  • the figures show a device for carrying out an essentially two-stage, linear movement on a plastic injection molding machine, which is suitable for processing plastics and other plasticizable materials such as powdery materials or ceramic materials.
  • plastic injection molding machines for example, the requirements change in the mold clamping unit according to FIG. rend of the movement process.
  • the movable mold carrier 11 should first be moved as quickly as possible according to a predetermined speed profile with little force, while a high locking force is necessary during the further closing movement.
  • Figure 1 shows the structure of a mold clamping unit which is arranged on a machine base 33.
  • the mold clamping unit has a support element 10 and a stationary mold carrier 30.
  • Stationary mold carrier 30 and support element 10 are connected to one another via transmission elements in the form of spars 32, which on the one hand serve as a guide for the movable mold carrier 11 and are at the same time designed as force transmission elements in order to transmit the forces occurring during injection molding.
  • the closing movement or the closing of the mold 31 takes place via a first drive unit 12 which is attached to the support element 10.
  • the movable mold carrier 11 is moved towards the stationary mold carrier 30 in the closing direction s-s by means of at least one linear movement means 15.
  • Movable mold carrier 11 stationary mold carrier 30 receive the mold 31 between them in a mold clamping space F.
  • the further movement or the application of the closing force takes place using at least a second drive unit 17, which can be actuated, in particular, after the drive unit 12 can be actuated at the same time, if necessary at times simultaneously with the first drive unit 12, essentially to build up the closing force.
  • At least the first drive unit 12 is supported on at least one support element 10 which is connected to the stationary mold carrier 30 via the bars 32.
  • Separating means 38 for separating the drive elements of the first drive unit 12 from the power flow as required can be actuated when at least one predeterminable condition is reached in the form of a translational position of the tube 15 and / or a predeterminable axial force. A complete separation is not necessary. It is sufficient if the further forces which are applied by the second drive unit 17 remain essentially without further influence, but the elements which were previously in the force flow of the first drive unit continue to be subjected to the previous forces. In this case, the force is superimposed without influencing these elements.
  • the first drive unit 12 and the second drive unit 17 thus form a device for carrying out a linear movement having at least two stages, the first drive unit 12 being able to be actuated essentially before the entry and the second drive unit 17 after the condition has occurred.
  • the separating means 38 fix the linear movement means 15 to an intermediate element 39 which is arranged on the support element 10.
  • the intermediate element 39 designed as a support plate can itself be magnetic or magnetizable or can have a magnetic plate 40 according to FIG. 2.
  • the support element is also provided with a magnetic plate 41.
  • the intermediate element 39 can thus be moved together with the linear movement means 15 at least by means of magnetic attraction forces generated by the second drive unit 17 in order to apply the closing force in the closing direction s-s. The movement takes place within a cover 42.
  • the magnetic plates 40, 41 correspond to one another, so that the available area in connection with the distance of the magnetic plates to one another determines the available magnetic forces when the second drive unit 17 is switched on.
  • the dimensions of the intermediate element 39 in the horizontal projection in the closing direction s-s are therefore preferably approximately as large as the supporting element 10. With such a configuration, the closing force can be applied magnetically by the second drive unit 17. Since the magnetic force increases exponentially when the distance between the magnetic plates is reduced, a high closing force can easily be generated. To open the mold and tear it open as required, only the polarity needs to be changed so that the first drive unit is not loaded with additional forces.
  • this magnetically actuatable second drive unit can always be used, such as in the structures known from the prior art, but preferred embodiments are explained below, which are characterized in particular by the type of release agent and the possibility given thereof Distinguish gradual transition from the first drive unit to the second drive unit from the prior art.
  • the first drive unit 12 is, for example, electromechanical, it can have a rotatably driven shaft 13 according to FIGS. 2, 3, which is mounted on the first drive unit 12 via a bearing 27.
  • the shaft 13 in turn has a head 14 with an external thread 14a.
  • the shaft 13 itself rotates and is fixed essentially axially unchangeable when the first drive unit is actuated in the direction of the shaft. The only axial movement is permitted by the disc springs 28 to be explained.
  • An internal thread 15a of the linear movement means 15 designed as a tube is operatively connected to the external thread 14a of the head 14.
  • This linear movement means 15 moves together with the movable mold carrier 11 and is arranged coaxially to the shaft 13.
  • rolling or rolling elements 16 are arranged in the form of planets in order to facilitate the rotational movement between the shaft 13 and the tube relative to the shaft 13 in the axial direction of the shaft. If the shaft 13 is rotated, the head 14 sets the planet in rotation with its external thread 14a, so that the engagement of these planet in the internal thread 15a of the linear movement means 15 results in an axial movement of the linear movement means 15.
  • the linear movement means 15 is arranged such that it penetrates the support element 10 and moves relative to the support element 10 as a result of the actuation of the first drive unit 12. It is mounted in a passage opening 10a of the support element.
  • a predeterminable condition which can be, for example, a certain translatory position of the linear movement means 15, for example a position shortly before the form closure, in order to carry out a subsequent injection molding, or the achievement of a predeterminable axial force
  • the shaft 13 is separated from the force flow by the means 38 as required uncoupled or the force of the second drive unit 17 is superimposed on the first drive unit 12.
  • a free movement is possible while the first drive unit 12 is actuated.
  • the first drive unit 12 can be released except for the linear movement means which transmit the forces.
  • This predeterminable condition can also comprise several individual conditions if e.g. both drive units are operated together over a certain period of time.
  • the separating means 38 for separating or superimposing the shaft by force are arranged on the support element 10 and, when the predeterminable condition is reached, releasably fix the linear movement means 15 indirectly via the intermediate element 39 on the support element 10. 1 and 2, the first drive unit 12 is supported on the side of the support element 10 facing away from the movable mold carrier 11 by means of connecting means 29 which serve as a guide for the intermediate element 39 via slide bearings 44. The movement of the intermediate element is limited by stops 45. Because of the connecting means 29, the position of the head 14 with respect to the support element basically does not change anymore.
  • the shaft 13 itself is surrounded by a further tube 34, so that the axial movement of the linear movement means 15 gives the impression of a piston-cylinder unit, the “piston” emerging from the “cylinder”.
  • permanent lubrication for the first drive unit can be introduced in the interior.
  • the first drive unit 12 can also be a magnetically operated linear motor 47 according to FIG. 4, part of which is formed by the linear movement means 15, while the internal stator is supported on the support element via the connecting elements 29, as in the electromechanical drive unit.
  • the separating means 38 clamp the linear movement means 15 in a force-fitting manner and, when only one linear movement means is used, centrally as soon as, for example, the positive connection is achieved and a corresponding signal is given to the Release agent 38 hydraulically active via the cylinder spaces 36,37 or electromagnetically.
  • the separating means 38 can also be actuated by means of a linear motor.
  • the release agents can be actively activated at any time, so that, for example, injection molding with a plastic injection molding machine can be switched from one drive unit to the other at any time, regardless of the respective forces, without a specific external force having to be effective first ,
  • I O aiming a superimposed movement to actuate the first drive unit 12 and the second drive unit 17 at least temporarily at the same time.
  • the first drive unit is still actuated while the second drive unit is already in operation.
  • the activity of the first drive unit 12 ends when the condition occurs and the activity of the second drive unit then begins.
  • the separating means 38 act like a collet.
  • an annular piston ben 25 can be moved hydraulically or magnetically in the closing direction SS.
  • An annular sleeve 46 with a cone is connected to the annular piston. To form the collet, this cone interacts with a counter cone on the intermediate element 39. If the predeterminable condition for switching between the first drive unit 12 and the further drive unit 17 or for switching on the second drive unit 17 is reached in this embodiment, the ring piston 25 is first moved to the left in FIG. 3. As a result, the two cones of the annular piston 25 and the intermediate element 39 are clamped together, so that the linear movement means 15 is non-positively clamped. The intermediate element 39 can then be moved together with the linear movement means 15 by the magnetic forces of the second drive unit 17.
  • the shaft 13 is elastically supported on the first drive unit 12 via plate springs 28. Without such elastic cushioning, there would be the danger that when the second drive unit is actuated, the force flow from the linear movement means via the separating means 38 and the annular piston 18 to the support element takes place, but there is a relative movement between the support element and the linear movement means which causes the rolling or rolling elements 16 and the shaft 13 or the linear motor 47 is claimed.
  • the disc springs 28 are provided in the area of the bearing 27.
  • the disc springs 28 can also act as damping elements in the above-mentioned superimposed movement, since the first drive unit 12 can be limited in torque or in the feed force.
  • the drive unit 12 can also have a torque or feed force limitation.
  • the first drive unit 12 is supported on the support element 10 via the connecting means 29 such that the head 14 of the shaft 13 carrying the external thread 14a comes to rest in the passage opening 10a of the support element 10, but is axially spaced from the separating means 38 in the axial direction of the linear movement means.
  • the structure of the device for carrying out a two-stage linear movement has so far only been explained on the basis of a linear movement means with a shaft and an electromechanical drive unit. Basically there is the possibility of arranging several of these devices in parallel.

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

Abstract

La présente invention concerne une unité de fermeture de moule destinée à une machine de moulage par injection, comportant une première unité d'entraînement (12) servant à la mise en mouvement du support de moule mobile (11) en direction de fermeture (s-s) vers le support de moule fixe (30) et en direction opposée de celui-ci, au moyen d'au moins un élément de mouvement linéaire (15). Une seconde unité d'entraînement (17), pouvant être actionnée au moins après la première unité d'entraînement (12), sert en particulier à la production d'une force de fermeture. Des éléments de séparation (38) permettent une séparation des éléments d'entraînement de la première unité d'entraînement (12) à partir du flux de force lorsqu'au moins une condition prédéterminée est atteinte, de sorte que la première unité d'entraînement (12) et la seconde unité d'entraînement (17) forment un dispositif permettant la réalisation d'un mouvement linéaire constitué essentiellement de deux étapes. Les éléments de séparation (38) rendant l'élément de mouvement linéaire (15) fixe au niveau d'un élément intermédiaire (39) lors de l'actionnement après que ladite condition soit atteinte, et l'élément intermédiaire (39) pouvant se déplacer dans la direction de fermeture (s-s) au moins grâce à des forces d'attraction magnétiques produites par la seconde unité d'entraînement (17), servant à la création d'une force de fermeture, une unité d'entraînement alternative, servant à la production de la force de fermeture, est mise à disposition dans un processus de mouvement linéaire constitué essentiellement de deux étapes.
PCT/EP2000/011210 1999-11-22 2000-11-14 Unite de fermeture de moule pour machine de moulage par injection WO2001038068A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1999156188 DE19956188C2 (de) 1999-11-22 1999-11-22 Formschliesseinheit für eine Spritzgiessmaschine
DE19956188.5 1999-11-22

Publications (1)

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WO2001038068A1 true WO2001038068A1 (fr) 2001-05-31

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PCT/EP2000/011210 WO2001038068A1 (fr) 1999-11-22 2000-11-14 Unite de fermeture de moule pour machine de moulage par injection

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WO (1) WO2001038068A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2054212A1 (fr) * 2006-08-15 2009-05-06 Husky Injection Molding Systems S.A. Actionneur de course de platine pour système de moulage

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2411694A1 (fr) * 1977-12-14 1979-07-13 Pont A Mousson Presse de moulage par injection
US5322430A (en) * 1992-01-30 1994-06-21 Toshiba Kikai Kabushiki Kaisha Mold clamping device in injection molding machine
EP0674985A1 (fr) * 1994-04-02 1995-10-04 Karl Hehl Unité de fermeture de moule pour une machine à mouler par injection et procédé pour son opération
JPH0948051A (ja) * 1995-08-08 1997-02-18 Toshiba Mach Co Ltd 射出成形機の型締装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT385464B (de) * 1986-05-13 1988-04-11 Engel Gmbh Maschbau Schliesseinheit fuer eine einrichtung zum spritzgiessen thermoplastischer kunststoffe
DE4336572C1 (de) * 1993-10-27 1994-12-15 Ferromatik Milacron Maschinenb Formzuhaltevorrichtung, insbesondere an Spritzgießmaschinen
DE19542453C2 (de) * 1995-11-14 1998-05-20 Karl Hehl Vorrichtung zur Umwandlung einer Drehbewegung in eine Axialbewegung
DE19536565C2 (de) * 1995-10-02 1998-07-16 Karl Hehl Spritzgießmaschine zur Verarbeitung plastifizierbarer Massen
DE19750057C2 (de) * 1997-11-12 2000-08-03 Karl Hehl Formschließeinheit für eine Spritzgießmaschine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2411694A1 (fr) * 1977-12-14 1979-07-13 Pont A Mousson Presse de moulage par injection
US5322430A (en) * 1992-01-30 1994-06-21 Toshiba Kikai Kabushiki Kaisha Mold clamping device in injection molding machine
EP0674985A1 (fr) * 1994-04-02 1995-10-04 Karl Hehl Unité de fermeture de moule pour une machine à mouler par injection et procédé pour son opération
JPH0948051A (ja) * 1995-08-08 1997-02-18 Toshiba Mach Co Ltd 射出成形機の型締装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1997, no. 6 30 June 1997 (1997-06-30) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2054212A1 (fr) * 2006-08-15 2009-05-06 Husky Injection Molding Systems S.A. Actionneur de course de platine pour système de moulage
EP2054212A4 (fr) * 2006-08-15 2009-09-02 Husky Injection Molding Actionneur de course de platine pour système de moulage

Also Published As

Publication number Publication date
DE19956188A1 (de) 2001-06-28
DE19956188C2 (de) 2003-07-31

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