EP1677963A1 - Unite de commande - Google Patents

Unite de commande

Info

Publication number
EP1677963A1
EP1677963A1 EP04802619A EP04802619A EP1677963A1 EP 1677963 A1 EP1677963 A1 EP 1677963A1 EP 04802619 A EP04802619 A EP 04802619A EP 04802619 A EP04802619 A EP 04802619A EP 1677963 A1 EP1677963 A1 EP 1677963A1
Authority
EP
European Patent Office
Prior art keywords
cylinder
drive unit
clamping
intermediate part
unit according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP04802619A
Other languages
German (de)
English (en)
Inventor
Jörg Dantlgraber
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bosch Rexroth AG
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
Priority claimed from DE10355328A external-priority patent/DE10355328A1/de
Application filed by Bosch Rexroth AG filed Critical Bosch Rexroth AG
Publication of EP1677963A1 publication Critical patent/EP1677963A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/64—Mould opening, closing or clamping devices
    • B29C45/68—Mould opening, closing or clamping devices hydro-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
    • B29C45/64—Mould opening, closing or clamping devices
    • B29C45/68—Mould opening, closing or clamping devices hydro-mechanical
    • B29C2045/685—Mould opening, closing or clamping devices hydro-mechanical using mechanical drive means for mould closing to obtain the hydraulic clamping 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
    • 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
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/47—Means for plasticising or homogenising the moulding material or forcing it into the mould using screws
    • B29C45/50—Axially movable screw
    • B29C45/5008—Drive means therefor

Definitions

  • the invention relates to a drive unit, in particular for a clamping unit, an injection unit or an ejector, an injection molding machine according to the preamble of patent claim 1.
  • Such requirements occur, for example, with a clamping unit or an injection unit or when actuating ejectors of a plastic injection molding machine.
  • a plasticizing screw is moved towards the mold at a relatively high axial speed until the mold is completely filled with plastic.
  • a high force must be applied via the injection unit without substantial axial advance of the plasticizing screw.
  • a closing unit for closing the mold of an injection molding machine The requirements for a closing unit for closing the mold of an injection molding machine are similar, the movable clamping plate for closing the Tool is first moved quickly via the electric drive and then only a short remaining stroke has to be carried out to completely close and hold the tool with the required closing force.
  • a drive unit of an injection molding machine in which the comparatively large axial forces are applied during the closing of the injection molding tool or during the holding pressure phase during injection via a hydraulic force translator.
  • This hydraulic power converter has a piston unit with a comparatively small effective area, which is actuated via a spindle arrangement.
  • the smaller piston unit together with another piston unit with a larger effective area and an axially displaceable cylinder, limits a pressure space.
  • the cylinder can be locked to apply large axial forces so that the axial movement of the smaller piston unit reduces the pressure chamber and, depending on the area difference between the smaller and larger piston units, the latter exerts a high axial force on the unit to be acted on
  • the cylinder of the force converter is fixed axially by bulging a cylinder wall radially outwards due to the pressure rising in the pressure chamber, so that the cylinder is non-positively fixed in a guide of the cylinder and thus no longer undergoes axial movement. can lead.
  • the invention has for its object to provide a drive unit for an injection molding machine, in which the guidance and the non-positive fixing of an intermediate part of a power converter of the drive unit are improved compared to the prior art.
  • the drive unit according to the invention has a force booster with two piston units which are movable relative to one another and have different active surfaces. Together with a displaceably guided intermediate part, these delimit a pressure space.
  • the intermediate part can be fixed via a clamping part to a support element supported on the frame of the injection molding machine. That the elements which form-fit the intermediate part - support element / clamping part - are formed separately from the guidance of the intermediate part, so that these components can be optimally designed for the respective task (guiding / clamping) and no functional compromises are required.
  • the support element supported on the frame of the injection molding machine has a support anchor, along which a radially deformable clamping sleeve can be displaced.
  • This clamping sleeve is operatively connected to the intermediate part in such a way that a fixing of the clamping sleeve on the support anchor, the intermediate part is locked in the axial direction.
  • the radial deformation in the clamping sleeve is preferably carried out hydraulically via the pressure in the pressure chamber.
  • the clamping sleeve is received in a clamping cylinder, the annular pressure chamber of which is connected to the pressure chamber of the force converter via a pressure line.
  • the intermediate part and also the clamping sleeve or the clamping cylinder are preferably guided via a guide plate which can be guided on spars of the injection molding machine.
  • this guide plate rests on the one hand on the clamping cylinder and on the other hand on the intermediate part.
  • the outlay in terms of device technology for realizing the invention can be further reduced if the support anchor and / or the clamping sleeve are resiliently prestressed in the direction of their respective support position.
  • the construction according to the invention allows the guide plate to be lubricated, so that the service life of the device was not possible compared to the conventional solution, in which the lubrication of the guide was considerably impaired, since otherwise the clamping effect would have been negatively influenced.
  • the intermediate part of the force intensifier is preferably designed as a cylinder in which the pistons of the two piston units are designed with a smaller and larger effective area and the pressure chamber.
  • FIG. 1 shows a schematic sectional illustration of a clamping unit of an injection molding machine. In the figure, only the upper half of the symmetrically constructed drive unit 1 is shown.
  • the drive unit 1 shown in the single figure is used to actuate the clamping unit of an injection molding machine, with a movable platen 2 initially being moved in the closing direction at a high speed (rapid traverse) and then when the movable half of the mold runs onto the half of the mold clamped on a fixed platen, the remaining stroke and the locking of the tool should be carried out with great force.
  • the drive unit 1 has a force booster 4, which has a piston unit 6 with a smaller effective area and a force booster piston 8 with a larger effective area.
  • a cylinder 16 of the power converter 4 is guided via a guide plate 10 to spars 12 which are mounted on a frame 14 of the injection molding machine and on which the movable mold mounting plate 2 is also mounted.
  • the cylinder 16 of the force converter 4 can be fixed with a holding device 18 with reference to the frame 14.
  • the force translator 4 is actuated via a spindle drive with a spindle 20 which is driven via an electrical drive (not shown) with a gear wheel or belt drive. is driven.
  • the spindle 20 fixed in the axial direction meshes with a spindle nut 22.
  • the spindle drive is designed as a recirculating ball drive.
  • the spindle nut 22 has a radially projecting support flange 24 on which a plurality of pistons 26 of the piston unit 6 are supported. Instead of a plurality of pistons 26, a single piston can also be used.
  • the individual partial pressure spaces 30 of the force booster 4 are hydraulically connected to one another and are part of a pressure space, the volume of which can be changed by axially displacing the pistons 26.
  • the cylinder 16 encompasses the spindle nut 22 and rests with a contact shoulder 32 on the end face of the support flange 24.
  • a clutch 34 preferably an electromagnetic clutch, is provided in the cylinder 16, via which the cylinder 16 can be coupled to the spindle nut 22, so that its axial displacement is transmitted to the cylinder 16.
  • annular space 36 is formed on the end face, in which a guide section 38 of the force transmission piston 8 designed as a hollow piston is guided.
  • the latter delimits, with the annular space 36, a force booster space 40, which is connected to the partial pressure spaces 30 via a pressure line 42, so that the pressure space of the force booster 4 is formed by these and the force booster space 40.
  • the annular end face of the force booster piston 8 removed from the guide section 38 acts directly or indirectly on the movable platen 2.
  • the force booster piston 8 is biased in the direction of a minimum volume of the force booster chamber 40 via a spring 44 arranged in the annular space 36 and engaging on the guide section 38.
  • the cylinder 16 has at its right end portion a radially projecting 'driving shoulder 46 to which the cylinder 16 is the encompassing guide plate 10 is supported in the axial direction.
  • the guide plate 10 has one or more recesses 50 offset with respect to its central axis 48, into each of which a clamping cylinder 52 of the holding device 18 is inserted. It is preferred to distribute several of the clamping cylinders 52 around the circumference; in principle, a single clamping cylinder 52 is sufficient with lower closing forces, which, however, should then act coaxially to the cylinder 16.
  • the clamping cylinder 52 dips with a stepped-down end section 54 into the recess 50 of the guide plate 10.
  • a spring 56 for example a plate spring arrangement, is placed on the end section 54 of the clamping cylinder 52, which is supported on the one hand on a ring 58 and on the other hand engages the guide plate 10, so that the clamping cylinder 52 is biased against the guide plate 10 with a shoulder 60.
  • the recess 50 is formed with a certain clearance to the outer circumference of the end section 54 of the clamping cylinder 52, so that a certain adjustment of the axial position (axis 62) of the clamping cylinder 52 is made possible by means of the spring 56.
  • a clamping sleeve 64 is inserted which, together with the jacket of the clamping cylinder 52, delimits an annular space 66 which is connected to the partial pressure spaces 30 via a connecting channel 68.
  • the connecting channel 68 extends from the cylinder 16 into the clamping cylinder 52 via the guide plate 10.
  • the annular space 66 is sealed off from the outside via sealing arrangements 70, 72.
  • the clamping sleeve 64 is designed such that it can be deformed in the radial direction when the annular space 66 is subjected to a predetermined minimum pressure and can thus be clamped on a support anchor 74. This positive connection is designed in such a way that the supporting forces resulting from the locking force can be transmitted.
  • the clamping sleeve 64 engages around the rod-shaped support anchor 74, the end section of which on the right in the illustration also passes through the guide plate 10.
  • the support anchor 74 is supported on one side by a support device 76 on the frame 14 of the injection molding machine.
  • the support device 76 has a support bracket 78 anchored to the frame 14, on which a biasing spring 80 is supported. This engages on a support ring 82 which is placed on the support armature 74 and is supported there, for example via a spring ring 84, in the axial direction.
  • the end face of the support armature 74 which is on the left in the illustration, is prestressed against a contact face 86 of the frame 14 by means of the prestressing spring 80.
  • the resilient positional positioning of the support armature 74 and the clamping cylinder 52 makes it easy to compensate for manufacturing tolerances, since the springs allow centering along the common axis 62.
  • the springs 56, 80 must be designed so strong that when opening the forces occurring due to friction on the form and in the guide are overcome.
  • a plurality of pistons 26 are used. Instead of these pistons, a single hollow piston can also be used, the annular end face of which has a substantially smaller effective area than the end face of the force transmission piston 8 received in the annular space 36.
  • the clutch 34 is first engaged so that the cylinder 16 is connected to the spindle nut 22.
  • the drive motor of the spindle 20 is actuated and the latter is rotated, so that the spindle nut 24 accordingly carries out an axial feed to the right (illustration).
  • the cylinder 16 is carried along via the clutch 34, so that the entire force converter 4 is shifted to the right and the tool mounting plate 2 is moved in the closing direction. This closing movement takes place at a comparatively high speed, with only a small force being transmitted via the spindle drive.
  • Force translator chamber 40 formed pressure chamber of the cylinder not 16, so that accordingly the pressure in the pressure chamber remains constant.
  • the cylinder 16 In order to prevent the cylinder 16 from moving to the left, it is clamped in place via the holding device 18. In the exemplary embodiment shown, this is done in that the clamping sleeve 66 is deformed radially inwards and positively on the outer circumference of the support rod 74 by the pressure rising in the pressure chamber (partial pressure chambers 28, force transmission chamber 40), which is also present in the annular chamber 66 via the connecting channel 68 is set.
  • the preloaded spring 44 ensures that a clamping force is built up before the closing force occurs. The clamping action is sufficient to fix the cylinder 16 to build up the locking force in the axial direction.
  • the force booster piston 8 which has a much larger effective area than the pistons 26, is subjected to a large force in the closing direction of the tool, depending on the area ratio of the effective areas, the stroke correspondingly being reduced
  • the cylinder 16 is guided exactly on the rigid bars 12 via the guide plate 10.
  • the force translator 4 through the pressure in the force Setzerraum 40 generated, acting on the movable tool half supporting force is transmitted via the cylinder 16, the driving shoulder 46, the guide plate 10 and over the shoulder 60 to the clamping cylinder 52 and further via the clamping sleeve 64 to the support anchor 74 and via the contact surface 86 in the Frame 14 of the injection molding machine initiated, so that a secure locking of the tool is guaranteed even with high closing forces.
  • the construction according to the invention is distinguished by an extremely simple construction, wherein high tolerance requirements for the construction can be avoided by the loose mounting of the support armature 74 and the clamping cylinder 52 with prestressed springs 80, 56.
  • the requirements for these springs 56, 80 are comparatively low, since they only have to transmit the frictional force and the forces for opening the tool. Since the leadership of the cylinder 16 is functionally different from that
  • the guides between the guide plate 10 and the spars 12 can be lubricated in an optimal manner.
  • the cylinder 16 is fixed, the deformations of the bars 12 are minimal, since the geometric accuracy of the holding device 18 is very high and the clamping cylinder 52 and the support anchors 74 can be optimally adjusted to one another and to the bars 12 by the loose mounting.
  • the illustrated one-sided mounting of the components furthermore enables good access to the drive unit and simple assembly and disassembly, so that maintenance is made easier.
  • a drive unit in particular for a clamping unit, an injection unit or an evaluation fer, an injection molding machine in which a large axial force can be applied via a hydraulic force intensifier.
  • a cylinder of the force intensifier can be fixed in relation to a frame of the injection molding machine by means of a holding device which is functionally separate from the guidance of the cylinder on the frame of the injection molding machine.

Abstract

L'invention concerne une unité de commande, destinée en particulier à une unité de fermeture, une unité d'injection ou un éjecteur d'une machine de moulage par injection. Avec cette unité de commande, une force axiale élevée peut être appliquée par l'intermédiaire d'un multiplicateur de force hydraulique. Un cylindre (16) de ce multiplicateur de force (4) peut être fixé relativement à un bâti (14) de la machine de moulage par injection par l'intermédiaire d'un dispositif de retenue (18) qui est séparé fonctionnellement du guidage (10, 12) du cylindre (16) au niveau dudit bâti (14).
EP04802619A 2003-10-30 2004-10-15 Unite de commande Withdrawn EP1677963A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10350955 2003-10-30
DE10355328A DE10355328A1 (de) 2003-10-30 2003-11-27 Antriebseinheit
PCT/DE2004/002305 WO2005044539A1 (fr) 2003-10-30 2004-10-15 Unite de commande

Publications (1)

Publication Number Publication Date
EP1677963A1 true EP1677963A1 (fr) 2006-07-12

Family

ID=34575411

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04802619A Withdrawn EP1677963A1 (fr) 2003-10-30 2004-10-15 Unite de commande

Country Status (3)

Country Link
US (1) US7351053B2 (fr)
EP (1) EP1677963A1 (fr)
WO (1) WO2005044539A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004027279B4 (de) * 2004-06-04 2012-10-04 Bosch Rexroth Ag Antriebseinheit für eine Spritzgieß- oder Spritzprägemaschine
DE102004033121B4 (de) * 2004-07-08 2014-03-06 Bosch Rexroth Aktiengesellschaft Antriebseinheit

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT292222B (de) * 1969-04-28 1971-08-25 Peter Florjancic Spindel-Schließvorrichtung, insbesondere für Spritzguß-Maschinen
US4030299A (en) * 1974-12-20 1977-06-21 Ex-Cell-O Corporation Intensified cylinder assembly
JP3325254B2 (ja) * 1999-05-20 2002-09-17 株式会社名機製作所 型締装置およびその作動制御方法
JP3835948B2 (ja) 1999-05-28 2006-10-18 三菱重工プラスチックテクノロジー株式会社 電動式型締装置
DE50103545D1 (de) 2000-05-23 2004-10-14 Bosch Rexroth Ag Antriebsvorrichtung, insbesondere für die schliesseinheit, die einspritzeinheit oder die auswerfer einer kunststoffspritzgiessmaschine
US6884057B2 (en) 2001-03-21 2005-04-26 Bosch Rexroth Ag Electromechanical clamping device
DE10154465A1 (de) * 2001-11-08 2003-05-22 Bosch Rexroth Ag Schließeinheit für eine Kunststoffverarbeitungsmaschine
DE10252046B4 (de) * 2002-11-08 2008-02-21 Dr. Boy Gmbh & Co. Kg Antrieb für eine Spritzgiessmaschine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2005044539A1 *

Also Published As

Publication number Publication date
WO2005044539A1 (fr) 2005-05-19
US7351053B2 (en) 2008-04-01
US20060280832A1 (en) 2006-12-14

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