WO2007041881A1 - Procede de fermeture de moules d'une machine de moulage par injection et fermeture geometrique - Google Patents

Procede de fermeture de moules d'une machine de moulage par injection et fermeture geometrique Download PDF

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Publication number
WO2007041881A1
WO2007041881A1 PCT/CH2006/000548 CH2006000548W WO2007041881A1 WO 2007041881 A1 WO2007041881 A1 WO 2007041881A1 CH 2006000548 W CH2006000548 W CH 2006000548W WO 2007041881 A1 WO2007041881 A1 WO 2007041881A1
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WO
WIPO (PCT)
Prior art keywords
drive
support plate
toggle
crosshead
drive support
Prior art date
Application number
PCT/CH2006/000548
Other languages
German (de)
English (en)
Inventor
Robert Weinmann
Placi Wenzin
Pier Fulvio Colombo
Original Assignee
Netstal-Maschinen 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 Netstal-Maschinen Ag filed Critical Netstal-Maschinen Ag
Publication of WO2007041881A1 publication Critical patent/WO2007041881A1/fr

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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
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/1761—Means for guiding movable mould supports or injection units on the machine base or frame; Machine bases or frames
    • 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
    • B29C45/681—Mould opening, closing or clamping devices hydro-mechanical using a toggle mechanism as mould clamping device

Definitions

  • the invention relates to a method for the FormsGhliessen a Spritzgiessmasehine a KniehebelmeGriani ⁇ mu ⁇ which, drive a Antfiebsst Reifenplatte and a first mold part supporting backing plate further includes a movable die for a second mold part and disposed between the driving support plate and the Wefkzeügäufs Georgnnplätte K ⁇ iehebel- having ". 'also relates to a Fofrnschlüss for an ' injection molding machine with a?
  • the toggle mechanism is arranged together with the toggle lever drive in a compact design between the drive support plate and the movable platen.
  • the machine can be built shorter.
  • EP 456 335 shows such a device for closing molds. It is assumed in this document of an injection molding machine with a fixed end plate with a, via a toggle mechanism on Holmen movable platen.
  • the knee levers are designed as a double toggle lever and arranged between the fixed end plate and the platen parallel to the machine main axis. It is proposed to connect two piston-cylinder units on the one hand with the fixed end plate and on the other hand with a single crosshead form-fitting with the Doppelkniehebeln.
  • the crosshead is designed as a frame construction.
  • the crosshead is guided over guide rods fixed to the fixed end plate for movement parallel to the machine main axis.
  • This will be altematively proposed to store the crosshead on guide bearings on at least two spars displaced.
  • the movement sequence of the double toggle lever is exactly defined by the double guidance of the crosshead, apart from tolerance errors of the entire machine structure, possible deformations as well as bearing play.
  • the solution has proven itself in practice.
  • the disadvantage is the relatively large effort for the multiple Wienkopf arrangement.
  • the accessibility of the entire space between the fixed end plate and the movable platen is impaired.
  • JP 6-91714 suggests a reasonable solution, but without a direct guidance of the crosshead.
  • the crosshead is driven by two piston-cylinder units.
  • the cross-head guide is ensured by two cylinders by being guided in the movable platen, at least in the locked position.
  • the OS 29 23910 shows a hydraulically driven toggle press, in which both the toggle mechanism and the toggle lever drive are arranged on the inside of the machine to shorten the overall length.
  • the movement of the movable mold carrier plate is ensured in two stages by three hydraulic cylinders.
  • One cylinder is used for the locking stroke and two cylinders are used as driving cylinder for the movable mold plate.
  • the movable mold plate is guided by four bars.
  • the crosshead has no separate guide next to the three cylinders. Shown is a vertical press.
  • the two functions locking and moving the movable platen are completely separated in terms of drive.
  • the locking cylinder is entrained by means of the driving cylinder. Only for the last stretch before and after the positive connection, the force is applied by the locking cylinder.
  • the USPS 6,004,490 goes one step further and proposes additional compensation cylinder, among other things as compensation for positional errors.
  • the crosshead is moved with two external electromotive drives. - A -
  • the object of the new invention was to search for solutions in which
  • the inventive method is characterized in that the toggle lever drive acts on the one hand on the drive support plate and on the other hand on a crosshead of the toggle mechanism centrally.
  • the positive connection according to the invention is characterized in that the toggle lever drive is arranged in the central region with respect to the crosshead and the drive support plate or the movable tool mounting plate.
  • the first state is the phase of the traveling movement of the movable platen. With the central force application by the toggle lever drive is avoided that possible side forces are initiated.
  • the second state is the phase of locking or large force build-up and force reduction.
  • a package is created, consisting of the counter plate and the movable platen and the two compressed mold halves and the tool.
  • trained crosshead guides can be disadvantageous in that larger local load peaks occur due to the deformations of individual machine parts. Due to the aforementioned indeterminacy of two or more guides, such loads can lead to long-term damage, in particular bearing damage.
  • the toggle mechanism is hydraulically driven via the crosshead, wherein the crosshead guide is ensured during the molding movement on the one hand on the piston rod and the drive carrier plate and on the other hand on the movable platen. It is dispensed with a direct leadership of the crosshead.
  • the whole toggle mechanism on the plates namely the drive support plate on the one hand and the movable Tool clamping plate on the other hand, so moved away from the bearings of the toggle mechanism.
  • the movable platen is linearly guided on the lower part, such that it can be moved as a single degree of freedom only horizontally in the direction of the molding movement, so
  • the drive support plate is clamped during the Formschliessmos in the direction of tool movement by the mold height adjustment, but is open in the remaining five degrees of freedom. This means that the drive support plate under the maximum locking forces in extended toggle levers can stand out on one side by a slight inclination or even at extreme extreme from their support surfaces.
  • the drive support plate can as it were hang on the spars, with almost uniform stress on the bearings of the toggle mechanism.
  • the piston rod is articulated relative to the drive support plate.
  • the piston rod and / or connecting elements of the piston rod abutment is stressed under load on bending and / or torsion.
  • the new solution provides that the piston rod bends slightly under the highest loads. The deflection of the piston rod serves as compensation for asymmetrical forces. These can occur due to misalignment of the column length and manufacturing tolerances of the lever mechanism during the locking phase.
  • the . movable platen is only horizontally movable in the direction of the molding movement as a single degree of freedom and is performed on the machine base substantially free of play.
  • the toggle lever drive is arranged in an axis which is directed towards the center of the mold. In this case, the user must endeavor with the incorporation of the forms in the sense of the invention to install the forms correspondingly precise.
  • the toggle drive is particularly preferably designed as a hydraulic drive with a double-acting cylinder, wherein the piston rod acts on the drive support plate and the cylinder on the crosshead of the toggle lever.
  • the cylinder can be firmly united with the crosshead of the toggle lever and formed as a central positive locking cylinder.
  • the piston rod can be mounted on the drive support plate via a joint and / or via a bending or a torsion element.
  • the piston rod can make one-sided effective forces for the force application to the movable platen harmless by a slight deflection.
  • the hydraulic connecting cables for the toggle lever drive are guided via the piston rod. Thus, no pressure hoses must be performed in the drive compartment.
  • the knee lift! on both sides next to the toggle drive symmetrically arranged in two parallel planes and each double on both sides, top and bottom, designed as a 5-point toggle.
  • the drive cylinder engages centrally on the toggle mechanism with four toggle levers.
  • the driving forces are thus transmitted symmetrically to four zones on the movable platen. This makes it easier to build the platen and still optimally transfer the power flow of the toggle levers on the molds.
  • the entire toggle mechanism can be designed in a compact design, such that it protrudes in the retracted position about the same distance from the drive support plate as the toggle lever drives.
  • the crosshead engages via a tab connection in each case on the outside of the four 5-point toggle levers, so that at least at the beginning of the toggle lever movement, the introduction of force and the transmission ratio is improved.
  • the drive support plate for the toggle mechanism has a free space in the retracted position in the inner region. This is not only an advantage in terms of length, but also helps to build the drive support plate easier. In this way, the toggle come in retracted position at least approximately within the support plate side articulation points of the toggle mechanism.
  • the movable platen is moved for mold opening and closing on a lower part via linear guides, in particular as rollers or recirculating ball bearings. These allow a substantially backlash-free linear guidance of the movable platen.
  • linear guides in particular as rollers or recirculating ball bearings.
  • the drive support plate is connected via adjustable columns with a counter-plate attached to a lower part and only supported on the lower part, without further anchoring down.
  • the drive support plate can under the locking force, except for the longitudinal fixing by the columns, arise freely upwards.
  • the drive support plate may, for example, slightly inclined or stand out easily from the base,
  • the columns in their outermost adjustment positions are only slightly above the drive support plate for reducing the machine length, but not beyond the piston rod abutments.
  • the column nut is designed in such a way within the drive support plate that, when adjusting for the maximum installation height of the mold, the columns do not project beyond the piston rod abutments in their outermost adjustment positions.
  • the movable platen has in the direction of the drive support plate projecting articulation points for the toggle mechanism. This allows an ejector plate to be movably disposed within the cantilevered hinge points.
  • the Ausstosserplatte preferably has two hydraulic drive cylinder, - which are arranged with their movement axis depending at a distance above and below the toggle lever drive.
  • the articulation points also serve to guide the hydraulic drives for the ejector plate.
  • the ejector plate is thus guided by the hydraulic cylinder and the Ausstosserdorne:
  • the proposed design ideas allow to arrange in the machine between the movable platen and the drive plate support only the components for the central functions positive engagement and injection molding and to optimize the accessibility: To tilting forces or tilting moments To avoid weight forces on the crosshead, this can also be supported on a central slide.
  • FIG. 1a shows the mold side of an injection molding machine (without
  • FIG. 1 b the mold side of an injection molding machine in the open position of the injection mold with the toggle levers withdrawn
  • FIG. 2 a solution with a crosshead on a slide rail
  • FIG. 1b shows a perspective view
  • FIG. 3b shows a section for the support of the drive carrier plate
  • FIG. 4 shows the horizontally displaceable module in a view IV from above
  • FIG. 5 the movable platen in a view from the drive side
  • FIG. 6 the drive for the column nut adjustment
  • FIG. 7 schematically the respectively different support of the
  • FIGS. 1 a and 1 b show the mold side of an injection molding machine which has a drive support plate 1, a movable tool clamping plate 2, a counterplate 3 and uprights 4, furthermore a toggle mechanism 5 and a toggle lever drive 6.
  • the entire assembly 13 is supported on a lower part 7.
  • the drive support plate 1 rests on a support surface 8 of the drive support plate 1 on sliding surfaces of the guide rails 10 on the lower part 7 and is on the bars 4 resp. held in position in the horizontal direction by means of column nut adjustments 14.
  • the movable platen 2 has a bottom guide bearing 9 and is on guide rails 10 in the horizontal direction back and forth.
  • the two mold parts 1 1 and 12 are respectively secured to the movable platen 2 and the counter-plate 3.
  • the counter plate 3 is stationary anchored or screwed on the lower part 7 via a screw 50.
  • the horizontal displacement is accomplished via a column nut adjustment 14 and primarily for adaptation for different thicknesses d, d 'needed.
  • the injection unit 15 is symbolically represented only as a quadrangle ( Figure 1a) and can, as is well known, analogously to arrow 16, the mold part 12 and Kirellesplatte 3 brought or removed again.
  • the toggle mechanism 5 consists of a crosshead 20 and four tab connections 21st
  • the toggle mechanism consists of four 5-point toggle levers, each of the 5-point toggle having a first toggle 22 and a second toggle 23.
  • the toggle drive 6 consists of a cylinder 31 and a piston rod 32.
  • the cylinder 31 is connected via a flange 33 rigidly connected to the crosshead 20.
  • the piston rod 32 has a piston rod end bearing 34, which is connected via a piston rod abutment 35 with the drive support plate 1.
  • a discharge device 40 in the space between the drive support plate 1 and the movable platen 2, a discharge device 40 must have space, as shown in Figures 1 a and 1 b can be seen.
  • the ejection device 40 consists of a Ausstosserplatte 41 and a Ausstosserplattenantrieb 42a, 42b, which are designed as hydraulic cylinders.
  • ejector bolts 43 are mounted, which must act through the movable platen 2 through into the mold cavity of the mold parts 1 1. Because the Ejector device 40 is connected to the movable platen 2, it also makes the same horizontal movement.
  • FIG. 2 shows a solution with a crosshead 20 supported on a slide 39.
  • the crosshead 20 has at the bottom a support shoe 38 with a bearing 38 '.
  • the aim of the solution according to Figure 2 is that all mobile weight forces acting on the crosshead 20 and the crosshead 20 are intercepted on the slide 39.
  • the entire slide 39 is arranged with the support shoe 38 and the bearing 38 'in a vertical plane which encloses the axis of the piston rod 32.
  • the solution according to FIG. 2 prevents tilting moments from the weight forces.
  • the support shoe 38 may be supported by a vertical pivot in the bearing 38 '. This allows a slightly greater movement tolerance between the crosshead 20 and the slide 39.
  • FIG. 3 a it can be seen even more clearly that the ejector plate drives 42 a, 42 b are arranged above and below the cylinder 31 so that the movements of the drives, the toggle levers and the ejection device 40 are not obstructed. From the perspective view of Figure 3a further recognizes the interaction of the three plates.
  • the counter-plate 3 is firmly connected by anchor bolts with the lower part and has support bearings 51 for the spars 4.
  • the spars 4 are mounted in column nut adjustments 14.
  • the two bearings form the actual abutment for the forces resulting from the force, arrow 53, on the mold half of the extended toggle.
  • the spars 4 are primarily claimed to train, as indicated by the arrows 52.
  • the movable platen 2 has only one degree of freedom, namely the sliding movement according to arrow 58, parallel to the center axis 44 ( Figure 1 a).
  • FIG. 3b shows that the drive support plate 1, which merely rests on a support surface 8 of the drive support plate 1 on a support surface 8a of the guide rails 10, can move horizontally as well as slightly lift off vertically.
  • FIG. 4 shows the assembly 13 in plan view according to arrow IV of FIG. 1 a. It can be seen that in the middle of the cylinder 31 and the two ejector drives 42a and 42b are arranged. On both sides symmetrically a 5-point toggle mechanism is shown.
  • FIG. 5 shows that, with respect to a vertical plane 46, the toggle lever drives 6 and the two ejector plate drives 42a, 42b lie in separate planes.
  • the toggle mechanism 5 has four 5-point toggle which is oriented up and down in opposite directions.
  • the 5-point toggle are in two planes 47, 48, which are arranged parallel to the plane 46 with the cylinders 31, 42a and 42b.
  • the movable platen 2 has 4 recesses in the region of the four spars, so that no forces are transmitted to the spars 4 of the movable platen 2.
  • the large locking forces are transmitted from the toggle lever drive 5 on the mold halves. Residual forces are collected via the guide bearings 9 and the guide rails 10.
  • FIG. 5 shows the spatial relationships between the movement space 80 of the toggle levers and the free surface 81 for the ejector plate 41 and for the ejector pin 43.
  • the ejector plate 41 may have a cross shape.
  • FIG. 6 shows the column nut adjustment 14.
  • a drive motor 70 (FIG. 4) drives a toothed ring 72 via a pinion.
  • the ring gear 72 drives with its external teeth each an adjusting 73 for each of the four columns 4.
  • By a rotational movement of the adjusting wheels 73 the four corners of the drive support plate 1 are adjusted horizontally by an equal amount.
  • FIG. 7 shows schematically the different supports of the plates.
  • a small gap S between the support surface 8a of the guide rail 10 and the support surface 8 of the drive carrier plate 1 is shown.
  • Arrow 90 indicates that the drive carrier plate can experience a slight tilting movement and with arrow 91 a slight vertical lift-off movement.
  • the horizontal position according to arrow 92 is set and locked via the columns 4 and the column nut adjustment 14.
  • the movable platen 2 is freely movable in horizontal movement on the guide rails by means of guide bearings 9, which may be designed as recirculating ball guides. All other degrees of freedom are blocked by the virtually backlash-free recirculating ball bearings.
  • the counter-plate 3 is firmly bolted to the lower part 7 via a screw 50 and thus has no degrees of freedom. Another interesting aspect is that for the piston rod 32 a slight, exaggerated deflection 93 is allowed. Any positional errors of the plates or the toggle or tolerance errors can be intercepted by the deflection of the piston rod 32.
  • the piston rod 32 is formed via a piston rod end bearing 34, for example, as a ball bearing and hinged to the piston rod abutment 35 (FIG. 8b), so that only slight compression forces are transmitted by the slight bending of the piston rod 32 during the maximum load.
  • Figures 8a and 8b show a further embodiment possibility in that a carrier 55 is formed for the piston rod abutment 35 as a bending and / or torsion element.
  • a carrier 55 is formed for the piston rod abutment 35 as a bending and / or torsion element.
  • For the torsion element is fixed on one end side via a bearing 56 and at the other end rotatably clamped via a bearing 57.
  • FIG. 9a and 9b show the mounting of the bars 4 in the drive carrier plate 1 and the counter plate 3.
  • FIG. 9a shows, on an enlarged scale, the drive end of the bars 4.
  • a column nut or transfer sleeve 60 which is rotatably mounted in the drive support plate 1; is set via a gear 73 as a mold height adjustment or - adjustment in rotation.
  • the supercharging sleeve 60 has at the inner end an internal thread 61, which engages in an external thread 62 of the spars 4.
  • the drive support plate 1 can be exactly moved together with the toggle lever and the movable Malawiplatte 2 by a desired amount for the mold height adjustment.
  • This process is part of setting up a new or different tool 11, 12.
  • the actual locking forces for the injection process are applied by the toggle mechanism 5 and closed by the bars 4.
  • the clamping of the bars 4 shown above can be achieved on the drive side, the overdrive sleeve 60 has a guide collar 63.
  • FIG. 9b shows the bars 4, which are rigidly connected on the metering side to the counterplate 3 in the sense of a statically clamped bar.
  • the rigid connection results from the following measures:
  • the two bearing halves are pressed together via bearing screws 66 and anchored via fastening screws 67 on the counter plate 3.
  • the bars 4 may alternatively be held by support rings 68. In the structural sense, the spars 4 are firmly clamped at the dosing end.
  • FIG. 10a shows a length comparison of an injection molding machine with external and internal toggle lever drives.
  • the whole machine can be shortened up to one meter according to the new solution.
  • the new solution Due to a more optimal design of the toggle mechanism 5, the new solution also results in an improved transmission ratio. In the example shown, approximately 30% more cylinder force is applied with the new solution. This with a much more compact design (Figure 10b).
  • a 5-point toggle can be used.
  • the movable platen can with high-precision ball or with rolling guides, which are guided almost free of play.
  • the mold height adjustment can be done centrally via a sun gear.
  • the positive lock cylinder is mounted directly on the crosshead, and no crosshead guide according to the prior art solutions is needed.
  • the two Ausstosserzylinder can be arranged at the top and bottom parallel to the positive locking cylinder.
  • the Ausst ⁇ sserplatte can be designed as a cross.

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

Abstract

L'invention concerne un procédé et un dispositif permettant de fermer les moules (11, 12) d'une machine de moulage par injection par un mécanisme à levier à coudé (5). Selon l'invention, le mécanisme à levier coudé (5) en entier et un vérin hydraulique (31) sont placés dans la machine entre la plaque d'appui et d'entraînement (1) et le plateau porte-moule (2) mobile. Le vérin hydraulique (31) est relié à la plaque d'appui et d'entraînement (2) par une tige de piston (32) et entre en prise avec une crosse (20) du mécanisme à levier coudé (5).
PCT/CH2006/000548 2005-10-08 2006-10-06 Procede de fermeture de moules d'une machine de moulage par injection et fermeture geometrique WO2007041881A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1649/05 2005-10-08
CH16492005 2005-10-08

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WO2007041881A1 true WO2007041881A1 (fr) 2007-04-19

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PCT/CH2006/000548 WO2007041881A1 (fr) 2005-10-08 2006-10-06 Procede de fermeture de moules d'une machine de moulage par injection et fermeture geometrique

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110461568A (zh) * 2017-03-27 2019-11-15 住友重机械工业株式会社 注射成型机
DE102012002258B4 (de) 2011-02-14 2023-06-29 Fanuc Corp. Rückwärtige Aufspannplatte einer gelenkstangenartigen Aufspanneinrichtung
US11926084B2 (en) 2021-02-05 2024-03-12 The Japan Steel Works, Ltd. Mold clamping device and injection molding machine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60248331A (ja) * 1984-05-25 1985-12-09 Yazaki Kako Kk トグルリンク式クランプ機構
EP0456335A1 (fr) * 1990-05-07 1991-11-13 MANNESMANN Aktiengesellschaft Dispositif pour fermer les moules d'une machine à mouler par injection
DE20008144U1 (de) * 2000-05-05 2000-08-24 Hwa Chin Machinery Factory Co Armstruktur für eine Spritzgußmaschine
AT6858U1 (de) * 2003-02-14 2004-05-25 Engel Austria Gmbh Hydraulikeinheit insbesondere für spritzgiessmaschinen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60248331A (ja) * 1984-05-25 1985-12-09 Yazaki Kako Kk トグルリンク式クランプ機構
EP0456335A1 (fr) * 1990-05-07 1991-11-13 MANNESMANN Aktiengesellschaft Dispositif pour fermer les moules d'une machine à mouler par injection
DE20008144U1 (de) * 2000-05-05 2000-08-24 Hwa Chin Machinery Factory Co Armstruktur für eine Spritzgußmaschine
AT6858U1 (de) * 2003-02-14 2004-05-25 Engel Austria Gmbh Hydraulikeinheit insbesondere für spritzgiessmaschinen

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012002258B4 (de) 2011-02-14 2023-06-29 Fanuc Corp. Rückwärtige Aufspannplatte einer gelenkstangenartigen Aufspanneinrichtung
CN110461568A (zh) * 2017-03-27 2019-11-15 住友重机械工业株式会社 注射成型机
EP3603930A4 (fr) * 2017-03-27 2020-03-18 Sumitomo Heavy Industries, Ltd. Machine de moulage par injection
US11926084B2 (en) 2021-02-05 2024-03-12 The Japan Steel Works, Ltd. Mold clamping device and injection molding machine

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