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WO1996027489A1 - Buse d'outillage chauffee - Google Patents

Buse d'outillage chauffee Download PDF

Info

Publication number
WO1996027489A1
WO1996027489A1 PCT/CH1996/000055 CH9600055W WO9627489A1 WO 1996027489 A1 WO1996027489 A1 WO 1996027489A1 CH 9600055 W CH9600055 W CH 9600055W WO 9627489 A1 WO9627489 A1 WO 9627489A1
Authority
WO
WIPO (PCT)
Prior art keywords
needle
actuating lever
injection nozzle
tool
nozzle
Prior art date
Application number
PCT/CH1996/000055
Other languages
German (de)
English (en)
Inventor
Christian René STERN
Original Assignee
Stern Christian Rene
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 Stern Christian Rene filed Critical Stern Christian Rene
Publication of WO1996027489A1 publication Critical patent/WO1996027489A1/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
    • B29C45/26—Moulds
    • B29C45/27—Sprue channels ; Runner channels or runner nozzles
    • B29C45/30—Flow control means disposed within the sprue channel, e.g. "torpedo" construction
    • 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
    • B29C45/26—Moulds
    • B29C45/27—Sprue channels ; Runner channels or runner nozzles
    • B29C45/28—Closure devices therefor
    • B29C45/2806—Closure devices therefor consisting of needle valve systems
    • B29C45/281—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
    • B29C45/26—Moulds
    • B29C45/27—Sprue channels ; Runner channels or runner nozzles
    • B29C45/28—Closure devices therefor
    • B29C45/2806—Closure devices therefor consisting of needle valve systems
    • B29C45/281—Drive means therefor
    • B29C2045/2837—Needle valves driven by rack and pinion

Definitions

  • the invention is in the field of plastics processing and relates to a heated tool injection nozzle for thermoplastic with a needle valve gate.
  • the needle valve gate offers advantages as soon as it comes to producing optically sophisticated injection molded parts. There are no bleed cones, there is no threading or running, optimal flow and filling properties are given. On the other hand, one has to accept a more complex injection nozzle design, particularly as far as the control of the closing and opening nozzle needle, the sealing needle, is concerned, which, if it is to perform this task, must also work very precisely under the influence of process heat and, on the other hand, with regard to the size of such injection nozzles, which are too large for many applications, for example lateral gating, due to the sometimes considerable additional effort. As a rule, closure needles are controlled from the opposite end of the closure side, which sometimes requires very long needles to get to the control mechanisms.
  • the reason for this is the thermal expansion of the valve pin.
  • the solution is to avoid "active thermal expansion lengths" as much as possible, that is to say to control the shut-off needle in such a way that the effect of thermal expansion at the shut-off location, the nozzle outlet or at the gate, is minimized. If one considers a closure needle in its entire length, it can be divided into different areas, an area for the needle guide, an area for the needle holder, an area for the needle control and so on.
  • FIG. 1 shows a longitudinal section through a tool injection nozzle in a preferred first embodiment according to the invention in the open position, in which the needle control is arranged in the nozzle head;
  • FIG. 2 shows the section according to FIG. 1 of the same nozzle in the closed position
  • FIG. 3 shows a cross section through the nozzle according to FIG. 2 along the line A-A with a view of the nozzle tip;
  • Fig. 4 shows the nozzle in use for side spraying or side gate (edge gate).
  • FIG. 5 shows a longitudinal section through a tool injection nozzle according to the invention in the open position, in which the needle control is arranged in the nozzle body, the needle length still being able to be designed;
  • FIG. 6 shows the section according to FIG. 5 of the same nozzle in the closed position
  • the nozzle is an injection nozzle of the To ⁇ edo type, which To ⁇ edo also forms the needle housing according to the invention
  • the second embodiment is an injection nozzle modified from the To ⁇ edo type.
  • the figures show a nozzle head, 2 a sealing needle, 3 a nozzle body and 4 an actuating element. lever for controlling the valve pin.
  • the other reference numbers show: la den To ⁇ edo, at the same time the needle housing, laa an open guide sleeve at both ends, which replaces the To ⁇ edo and forms the needle housing together with an aligned, final bore lab in the nozzle head, lb the needle guide, lc the melt line or the passages of the melt to the nozzle opening, ld lever stop in the up position or valve closed, le slot-like recess, lf lever stop in the down position or valve open, lg the lever bearing, lh the sealing part on the guide sleeve or sealing surface on the guide sleeve, li the Guide part in the tool, 2 the locking needle, 2a toothing on the locking needle, 2b a sealing surface of the needle shoulder, 2c the tip of the locking needle, 2d the needle shoulder, 3 the nozzle body with 3a the melting channel of the nozzle and 3b the slot or groove Guide an actuating element S, 4 of the actuating lever, 4a a fastening
  • FIGS. 1 and 5 each show an embodiment of the injection nozzle according to the invention. It essentially consists of a nozzle head 1 encased with a heater 10, in the center of which there is the typical tophedo la or the needle guide laa, lab modified therefrom.
  • the nozzle head 1 is placed on a nozzle body 3, into the feed channel 3a of which the tophedo projects for the melt.
  • two passages lc see also FIG. 3
  • the melt can be passed to the cap 7 with the gate 6, which gate 6 can be closed by means of the closing needle 2 or its needle tip 2c.
  • Figure 1 shows the open position.
  • the needle 2 is arranged inside the To ⁇ edos la, which takes over the needle guide lb.
  • the To ⁇ edo la has an incision or a slot-shaped passage le as close as possible to its mouth to the tool.
  • An axis 5 is mounted in the nozzle head 1 transversely to this slot-shaped bushing and serves as a pivot bearing for an actuating lever 4, about which this lever can be rotated.
  • This actuating lever 4 has, on its end facing the locking needle, an engagement toothing 4c which is in engagement with a counter toothing 2a on the needle.
  • the actuating lever is arranged in such a way that the engagement toothing 4c can protrude through the incision le, in order to cause the needle 2 to move in the torpedo la when pivoting about the axis 5.
  • the actuating lever 4 which is arranged in the nozzle head and does not provide free access during operation, about the axis 5, it has at its other end a fastening bore 4a or similar device for engaging an actuating means S, preferably a cable or the like, which Traction element is guided by a guide li to an adjusting mechanism, not shown here. If one selects a cable pull for setting the locking needle, the actuating lever must be brought into a forced position into which it returns automatically due to the spring element F; in FIG.
  • the constraint position is the open position of the valve pin.
  • the constraint is brought about, for example, by an adjusting spring.
  • both adjusting movements can be implemented by means of a cable pull or the like.
  • the closure needle shown here has a cylindrically shaped closure on the needle tip 2c.
  • a needle shoulder 2d with a sealing surface 2b pointing towards the tophedo prevents the penetration of melt material during the pressing pressure into the needle housing or into the interior of the tophedo la.
  • the needle can thus be designed to be relatively short, the area for the needle guide extends over the entire length of the needle, as does the area for the needle holder.
  • the area for the needle control, the toothing 2a extends over the actuating length and is advanced as far as possible to the needle tip 2c.
  • the “active thermal expansion length” thus extends from the point of engagement to the tip of the needle; it is very short and only varies over the actuating length, that is, over the stroke length of open-closed, generally a few millimeters. This is where the control of the needle starts where the effect of thermal expansion has little influence on the closing function of the nozzle and leaves other areas of the needle in which the thermal expansion does not play a functional role to guide and hold them, as mentioned at the beginning .
  • the overall length of the sealing needle no longer plays an important role in the conflict of objectives between mechanical precision and process heat effects or fluctuations.
  • FIG. 2 shows the injection nozzle according to the invention in the closed position, in which the actuating element S, the cable (not shown here), rotates the actuating lever 4 clockwise about the axis 5 against the restoring force to the forced position, the locking needle 2 in engagement with the Ka - Lotte 7 is pushed so that the tip 2c closes the opening 6 of the cap 7.
  • the precise needle guidance close to the gate permits a cylindrical configuration of the closure tip and thus a cylindrical gate. This has various advantages such as simplified assembly, easy adjustment, better needle impression, the displacement of the melt is cheaper and other things more.
  • FIG. 3 shows the injection nozzle in section along the line AA in FIG. 2 in the direction towards the nozzle opening.
  • FIG. 4 shows an injection nozzle or the head of the nozzle, as is shown in FIGS. 1 to 3, which is inserted into the one channel of a branch to two lateral injection points.
  • a groove, or a slot 3b, is slot / groove for the actuating element S in the nozzle head.
  • This guide is designed in such a way that the least amount of processing work is required to relocate the valve actuation. So far, the problem has been the dimensions of tool injection nozzles with a needle valve gate, which made the placement in the tool for a side gate (edge-gate technology) very problematic or impossible.
  • the invention enables dimensions with which the side cut in the tool becomes problem-free.
  • the second embodiment of FIGS. 5 and 6 described below can also be used in this way.
  • Figure 5 shows in a slightly modified form the same principle, which can also be used in tool nozzles without To ⁇ edo.
  • the length of the del is still subcritical and short in comparison to the usual needle lengths.
  • the control is, compared to such conventional needle lengths within the desired proportion, if not as extreme as the preferred embodiment enables.
  • a guide sleeve laa is inserted in the nozzle body 3 (you can compare it with a To ⁇ edo that is open at the top) and the needle guide is brought to the required length in the nozzle body 3 by a further aligned bore lab, whereby the point of engagement for the teeth the needle is in the nozzle body 3 and not in the nozzle head 1.
  • FIG. 6 shows the embodiment according to FIG. 5 in the closed position in which the actuating element S, the Actuating lever 4 rotates clockwise about the axis 5 against the restoring force to the forced position, the engaging locking needle 2 being pushed towards the cap 7, so that the tip 2 c closes the opening 6 of the cap 7.
  • the precise needle guidance close to the gate permits a cylindrical configuration of the closure tip and thus a cylindrical gate. This has various advantages such as simplified assembly, easy adjustment, better pinprints, the displacement of the melt is cheaper and more.
  • This construction as it has the injection nozzle according to the invention, has the advantage of an extraordinary compactness.
  • Pneumatic or hydraulic additional devices for controlling the shut-off needle are located outside the tool or the mold; no spatial measures have to be provided in the tool itself, as was previously the case.
  • the control, by cable, lever and rack, as discussed in this embodiment, is technically very simple and therefore not prone to malfunction and easy to use, such as assembly, adjustment and control.
  • other forms of actuation of the actuating lever and the locking needle are also possible, which will not be dealt with here, since it is sufficient for a person skilled in the art if the basic principle of an essential embodiment, as shown here, is shown to them.
  • the compact design of the injection nozzle possible by the invention leads to a further eminent advantage, namely the use for side gating.

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

Abstract

La buse d'injection selon l'invention évite autant que possible les longueurs actives de dilatation thermique, c'est-à-dire que l'aiguille d'obturation est commandée de telle façon que l'effet de la dilatation thermique à l'endroit de la fermeture, à savoir l'orifice de la buse ou le point d'injection, soit réduit au minimum. Si l'on considère une aiguille d'obturation sur toute sa longueur, on peut la diviser en différentes parties, à savoir une partie pour le guidage de l'aiguille, une pour la fixation de l'aiguille, une pour la commande de l'aiguille et ainsi de suite. De préférence, l'aiguille (2) est placée à l'intérieur de la torpille (1a) d'une buse d'outillage chauffée, la torpille assurant le guidage (1b) de l'aiguille. La torpille (1a) présente, aussi près que possible de son orifice côté outillage, une encoche (1e). Un axe (5) monté perpendiculairement à cette encoche sert de support de pivotement à un levier d'actionnement (4) qui peut tourner autour de cet axe. Ce levier d'actionnement présente, à son extrémité tournée vers l'aiguille d'obturation, une denture d'engrènement (4c) qui est en prise avec la denture opposée (2a) sur l'aiguille. Le levier d'actionnement est disposé de telle façon que la denture d'engrènement (4c) puisse dépasser à travers l'encoche (1e) afin de produire un déplacement de l'aiguille (2) dans la torpille (1a) lors du pivotement autour de l'axe (5). De cette façon, la longueur active de dilatation thermique est rendue plusieurs fois inférieure à celle d'aiguilles d'obturation connues. Dans un autre mode de réalisation, le point d'engrènement sur l'aiguille n'est pas situé dans la filière (1) mais dans le corps de buse (3).
PCT/CH1996/000055 1995-03-03 1996-02-21 Buse d'outillage chauffee WO1996027489A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CH605/95-0 1995-03-03
CH60595 1995-03-03
CH1127/95-5 1995-04-20
CH112795 1995-04-20

Publications (1)

Publication Number Publication Date
WO1996027489A1 true WO1996027489A1 (fr) 1996-09-12

Family

ID=25685099

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CH1996/000055 WO1996027489A1 (fr) 1995-03-03 1996-02-21 Buse d'outillage chauffee

Country Status (1)

Country Link
WO (1) WO1996027489A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001003905A1 (fr) * 1999-07-07 2001-01-18 Husky Injection Molding Systems Ltd. Dispositif d'entree a obturateur pour canal isole
US6893249B2 (en) 2001-09-07 2005-05-17 Mold-Masters Limited Valve pin actuating mechanism
US7048532B2 (en) 2002-12-02 2006-05-23 Mold-Masters Limited Stroke limiter for valve pin actuating mechanism
US7131834B2 (en) 2002-08-14 2006-11-07 Mold-Masters Ltd. Valve pin adjustment device
WO2010127965A2 (fr) * 2009-05-06 2010-11-11 Ewikon Heisskanalsysteme Gmbh & Co. Kg Buse à canal chaud pour l'injection latérale sur des objets
EP3380295B1 (fr) 2016-06-09 2020-01-22 Synventive Molding Solutions, Inc. Transmission par câble de commande d'actionneur pour système de moulage par injection
US11731330B2 (en) 2020-04-08 2023-08-22 Mold-Masters (2007) Limited Molten plastic delivery system with push-pull cable actuation

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE931677C (de) * 1952-12-02 1955-08-16 Licentia Gmbh Spritzduese fuer thermoplastische Massen verarbeitende Spritzgussmaschinen
FR2237750A1 (fr) * 1973-07-16 1975-02-14 Hehl Karl
EP0058462A1 (fr) * 1981-02-18 1982-08-25 Eurotool B.V. Système de fermeture
EP0373293A2 (fr) * 1988-12-16 1990-06-20 Jobst Ulrich Gellert Mécanisme de commande à crémaillère pour l'aiguille d'obturateur de moulage par injection

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE931677C (de) * 1952-12-02 1955-08-16 Licentia Gmbh Spritzduese fuer thermoplastische Massen verarbeitende Spritzgussmaschinen
FR2237750A1 (fr) * 1973-07-16 1975-02-14 Hehl Karl
EP0058462A1 (fr) * 1981-02-18 1982-08-25 Eurotool B.V. Système de fermeture
EP0373293A2 (fr) * 1988-12-16 1990-06-20 Jobst Ulrich Gellert Mécanisme de commande à crémaillère pour l'aiguille d'obturateur de moulage par injection

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001003905A1 (fr) * 1999-07-07 2001-01-18 Husky Injection Molding Systems Ltd. Dispositif d'entree a obturateur pour canal isole
US6328554B1 (en) 1999-07-07 2001-12-11 Husky Injection Molding System, Ltd. Valve gating arrangement for an insulated runner
US6893249B2 (en) 2001-09-07 2005-05-17 Mold-Masters Limited Valve pin actuating mechanism
US7131834B2 (en) 2002-08-14 2006-11-07 Mold-Masters Ltd. Valve pin adjustment device
US7048532B2 (en) 2002-12-02 2006-05-23 Mold-Masters Limited Stroke limiter for valve pin actuating mechanism
WO2010127965A2 (fr) * 2009-05-06 2010-11-11 Ewikon Heisskanalsysteme Gmbh & Co. Kg Buse à canal chaud pour l'injection latérale sur des objets
WO2010127965A3 (fr) * 2009-05-06 2011-01-20 Ewikon Heisskanalsysteme Gmbh & Co. Kg Buse à canal chaud pour l'injection latérale sur des objets
US8899963B2 (en) 2009-05-06 2014-12-02 Ewikon Heisskanalsysteme Gmbh Hot nozzle for lateral spraying
EP3380295B1 (fr) 2016-06-09 2020-01-22 Synventive Molding Solutions, Inc. Transmission par câble de commande d'actionneur pour système de moulage par injection
EP3380295B2 (fr) † 2016-06-09 2022-11-09 Synventive Molding Solutions, Inc. Transmission par câble de commande d'actionneur pour système de moulage par injection
US11731330B2 (en) 2020-04-08 2023-08-22 Mold-Masters (2007) Limited Molten plastic delivery system with push-pull cable actuation

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