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EP3164236B1 - Procédé et dispositif pour couler au moins une pièce - Google Patents

Procédé et dispositif pour couler au moins une pièce Download PDF

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Publication number
EP3164236B1
EP3164236B1 EP15729747.4A EP15729747A EP3164236B1 EP 3164236 B1 EP3164236 B1 EP 3164236B1 EP 15729747 A EP15729747 A EP 15729747A EP 3164236 B1 EP3164236 B1 EP 3164236B1
Authority
EP
European Patent Office
Prior art keywords
nozzle
component
mould
plug
mold
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.)
Active
Application number
EP15729747.4A
Other languages
German (de)
English (en)
Other versions
EP3164236A1 (fr
Inventor
Christian PLATZER
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.)
Ltc GmbH
Original Assignee
Ltc GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ltc GmbH filed Critical Ltc GmbH
Publication of EP3164236A1 publication Critical patent/EP3164236A1/fr
Application granted granted Critical
Publication of EP3164236B1 publication Critical patent/EP3164236B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/22—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
    • B22D17/2272—Sprue channels
    • B22D17/2281—Sprue channels closure devices therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/007—Semi-solid pressure die casting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/2015—Means for forcing the molten metal into the die
    • B22D17/2023—Nozzles or shot sleeves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/2015—Means for forcing the molten metal into the die
    • B22D17/2038—Heating, cooling or lubricating the injection unit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/2015—Means for forcing the molten metal into the die
    • B22D17/2061—Means for forcing the molten metal into the die using screws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/22—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/32—Controlling equipment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D21/00—Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
    • B22D21/002—Castings of light metals
    • B22D21/007—Castings of light metals with low melting point, e.g. Al 659 degrees C, Mg 650 degrees C
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D21/00—Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
    • B22D21/02—Casting exceedingly oxidisable non-ferrous metals, e.g. in inert atmosphere
    • B22D21/04—Casting aluminium or magnesium

Definitions

  • the invention relates to a method for casting at least one component, wherein flowable material, in particular magnesium or a magnesium alloy in the thixotropic state, to form the at least one component is injected under pressure into a cavity of a multi-part mold via at least one nozzle, after which the component is in the The mold is allowed to solidify, with a particularly solid plug forming in the nozzle, whereupon the mold is opened and the at least one component is removed, after which the mold is closed and the next component is created.
  • flowable material in particular magnesium or a magnesium alloy in the thixotropic state
  • the invention relates to a device for casting at least one metallic component with a conveying device for material in the flowable state, in particular magnesium or a magnesium alloy in the thixotropic state, and at least one nozzle with a heating device and a multi-part mold which has at least one cavity for the having creating component, wherein the material for forming the at least one component can be injected into the at least one cavity of the mold via the conveying device and the downstream downstream at least one nozzle and the mold can be opened to remove the at least one component after it has solidified in order to Component and closing the mold to start a new creation cycle.
  • magnesium and magnesium-based alloys are also used, since magnesium and corresponding alloys, in addition to mechanical parameters that are sufficient for many areas, have the advantage of a low density and thus a low weight of components.
  • Magnesium and magnesium-based alloys can in particular be processed using die-casting technology. Under certain circumstances, however, this can lead to problems, especially if burn-off, oxidation and / or segregation of alloy additives occur in a crucible. In such cases, so-called thixo injection molding or thixomolding, which works in a closed process sequence, has proven itself.
  • magnesium is heated up to a transition temperature for the phase transition from solid to liquid and at this temperature is transported by a conveyor to a downstream nozzle. In this state there are fine crystallites surrounded by melt.
  • the conveying means is usually designed as a screw, which is located in the so-called barrel or is held in it. In the barrel, the material is transported by propulsion with the screw to the nozzle, which in turn is integrated in a part of a multi-part mold.
  • the multi-part mold is generally designed in two parts, the part opposite the part integrating the nozzle having one or more cavities for the component or components to be produced. The second part of the mold is mounted so that it can be moved so that the mold can be repeatedly opened and closed for removing and manufacturing components.
  • thixotropic material is injected at high pressure via the barrel and the nozzle, so that the cavities are completely filled.
  • injection molding takes place at a single point, from which the sections to be filled lead to the individual cavities.
  • the components can be allowed to solidify.
  • the mold is then opened and the components removed, which can then be separated. If there is only one cavity or if only a (larger) component is to be created, the procedure is analogous, with the cavity then being filled with the flowable material at several points.
  • Patent documents WO2013067567 , DE10239817 , DE69637088 , WO2007028265 , US2005006046 disclose such methods of die casting thixotropic material.
  • the material in the nozzle solidifies due to heat transfer from the mold, which is at this stage to a temperature below the temperature level of the melt, as well as the material solidifying in the mold, so that a plug usually forms.
  • This plug formation is not only desirable, but also necessary so that when the mold is opened later and when magnesium is replenished, magnesium does not escape freely in the area of the nozzle or the gate, which of course is not desired.
  • the plug is ejected by a correspondingly high pressure.
  • a Well which receives the plug and is referred to as a plug catcher.
  • a plug catcher receives the plug and is referred to as a plug catcher.
  • problems are also associated with it.
  • the plug leads to the fact that enormous forces act at the beginning of the shooting due to the counterpressure generated in the barrel. It is believed that the pressure splash in the barrel caused by the plug significantly limits its lifespan. This is where the invention comes into play.
  • the object of the invention is to provide a method of the type mentioned at the outset and a device suitably designed for this purpose, in which component production can take place under more gentle conditions for the device.
  • the procedural object is achieved by a method according to claim 1 and a suitable device according to claim 5 for implementing such a method.
  • the method-related object is achieved if, in a method of the type mentioned at the beginning, the nozzle is heated with the mold open in order to at least soften the plug formed in the nozzle before the next component is produced.
  • a heating power at the nozzle is set in such a way that the plug softens without material entering the cavity. After the mold has been closed, the heating power at the nozzle can then be increased. In this state, the plug in particular can be fully melted because any material can only enter the closed mold and thus the cavities. It can furthermore be expedient that a heating power at the nozzle is reduced when the component is allowed to solidify, so that the temperature falls below a temperature for plug formation in the nozzle. Overall, a controlled temperature control at or in the nozzle can thus achieve an optimal situation with regard to plug formation on the one hand and plug dissolution on the other hand, without any restrictions with regard to quality or quality Cycle duration would have to be accepted. Rather, a heating and, if necessary, cooling program can be specifically and variably adapted to the individual steps of a creation cycle including injection, opening of the mold and component removal, mold cleaning and release agent application and closing of the mold for a new injection.
  • the further aim is achieved if, in a device of the type mentioned at the beginning, a control is provided for the heating device which variably controls a temperature on or in the nozzle as a function of the status of the creation cycle.
  • the temperature at or in the nozzle can be controlled in such a way that, according to the above statements, optimal conditions for plug formation before opening the mold and plug softening and / or plug dissolution before the next injection of material always result .
  • any heating elements that can be controlled accordingly can be used.
  • the heating device is a resistance heater, since inductive heating of the at least one nozzle, which is ultimately an integral part of a part of a mold, including the required control, can be implemented with difficulty. With resistance heating, on the other hand, this is possible in a relatively simple manner.
  • the heating device can comprise a plurality of resistance heating elements that can be controlled separately from one another.
  • the nozzle is made of hot-work steel. This allows the temperature in the nozzle, which is essential, to be controlled particularly precisely.
  • the heating device is soldered to the at least one nozzle in order to ensure efficient heat transfer.
  • the heating device is arranged in depressions on the outside of the at least one nozzle. In fact, it has also proven to be particularly useful, again for good heat transfer and thus rapid temperature setting on or in the nozzle, when the heating device is arranged in depressions on the outside of the at least one nozzle.
  • the heating device can run spirally around the at least one nozzle.
  • a device 5 which is designed for thixomolding of components made of magnesium or a magnesium alloy.
  • the device 5 comprises a container 6 in which the material 1 to be processed is kept in stock in the form of granules.
  • Material 1 is conveyed from container 6 into a filler neck 7 via a conveying element such as a suction conveyor. Via the filler neck 7, the material 1 reaches a barrel 8 which is provided with a screw with a corresponding drive.
  • the barrel 8 is kept at a suitable temperature by means of a heater, so that the material 1 assumes a thixotropic state or, in this state, is transported to a downstream nozzle 2.
  • the nozzle 2 is integrated in a first part 9 of a mold.
  • a second part 10 of the mold lies opposite the first part 9 of the mold and is horizontally displaceable so that the mold can be opened, for example in order to remove components produced by means of a robot arm 11.
  • the nozzle 2 of the device 5 is subjected to a temperature program which, without extending the cycle time, leads to lower pressure peaks in the barrel 8 and thus significantly increases its service life.
  • the variable temperature control at or in the nozzle 2 is in Fig. 3 shown for one creation cycle.
  • the nozzle 2 is subjected to maximum heating power so that the material 1 can flow freely through the nozzle 2. This corresponds to state A.
  • the heating power can be reduced in a first section of the nozzle 2, which is closer to a gate, as indicated by a changed hatching in the heating device 4 is shown. This corresponds to state B.
  • a plug 3 then forms in the nozzle 2 in that area which is at the beginning of the nozzle 2. Cooling may be useful for plug formation, but does not necessarily have to be implemented. Since the mold is cooled in order to solidify the component (s) and magnesium has good thermal conductivity, the plug 3 can in principle also form when the nozzle 2 is heated further, albeit at a reduced rate. When the mold is opened and the component is removed, the plug 3 breaks off in the area of the nozzle 2, but remains essentially intact. This corresponds to state C. The mold is still open, but the heating device 4 can already operate at a higher power in order to soften the plug 3. This corresponds to state D. As soon as the mold is closed again, the heating device 4 can be operated at full power, so that the plug 3 ideally melts completely.
  • a structure of a nozzle 2 including heating device 4 is shown, which is particularly suitable for these purposes.
  • the heating device 4 is designed as a resistance heater, the heating device 4 extending in a spiral shape around the nozzle 2 and being soldered into depressions on the outside of the nozzle 2.
  • the nozzle 2 itself usually consists of a steel, in particular a hot-work steel.
  • the intimate connection of the heating device 4 to the nozzle 2 enables rapid heat transfer to be achieved, which enables the times of the usual injection processes to be adhered to.
  • the heating device 4 with the nozzle 2 can be integrated relatively easily into the first part 9 of the mold.

Landscapes

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

Claims (7)

  1. Procédé de coulage d'au moins une pièce, du matériau métallique fluide (1), en particulier du magnésium ou un alliage de magnésium en état thixotrope, pour former l'au moins une pièce au moyen d'au moins une buse (2) sous pression dans une cavité d'un moule à plusieurs parties, après quoi on laisse la pièce se solidifier dans le moule, un bouchon en particulier solide (3) se formant dans la buse (2), sur quoi le moule est ouvert et l'au moins une pièce est sortie, après quoi le moule est fermé et la pièce suivante est réalisée, caractérisé en ce que la buse (2) est chauffée avec le moule ouvert pour au moins ramollir le bouchon (3) formé dans la buse (2) avant la réalisation de la pièce suivante.
  2. Procédé selon la revendication 1, caractérisé en ce que, après l'ouverture du moule, une puissance de chauffage au niveau de la buse (2) est réglée de manière à ce que le bouchon (3) ramollisse sans entrée de matériau (1) dans la cavité.
  3. Procédé selon la revendication 2, caractérisé en ce que, après la fermeture du moule, la puissance de chauffage au niveau de la buse (2) est augmentée.
  4. Procédé selon une des revendications 1 à 3, caractérisé en ce qu'une puissance de chauffage au niveau de la buse (2) est réduite lorsqu'on laisse se solidifier la pièce, de sorte qu'une température de formation de bouchon dans la buse (2) n'est pas atteinte.
  5. Dispositif (5) de coulage d'au moins une pièce métallique pour la réalisation d'un procédé selon une des revendications 1 à 4, comportant un dispositif de transport pour du matériau (1) à l'état fluide, en particulier du magnésium ou un alliage de magnésium en état thixotrope, et au moins une buse (2) dotée d'un système de chauffage (4), et un moule à plusieurs parties qui présente au moins une cavité pour la pièce à réaliser, le matériau (1), pour former l'au moins une pièce, au moyen du dispositif de transport et de l'au moins une buse (2) disposée en aval, étant injectable dans l'au moins une cavité du moule, pour ensuite laisser la pièce se solidifier dans le moule, un bouchon en particulier solide (3) se formant dans la buse (2), et le moule pouvant être ouvert pour sortir l'au moins une pièce après solidification de celle-ci, afin, après la réalisation de la pièce et la fermeture du moule, de commencer un nouveau cycle de réalisation, étant prévue pour le système de chauffage (4) une commande qui contrôle une température de manière variable au niveau ou dans la buse (2) en fonction du statut du cycle de réalisation de manière à ce que la buse (2) puisse être chauffée lorsque le moule est ouvert au moins afin de ramollir le bouchon (3) formé dans la buse (2) avant la réalisation de la pièce suivante, le système de chauffage (4) étant disposé dans des creux situés à l'extérieur de l'au moins une buse (2), caractérisé en ce que le système de chauffage (4) est brasé au niveau de l'au moins une buse (2) et la buse (2) est constituée d'un acier travaillé à chaud.
  6. Dispositif (5) selon la revendication 5, caractérisé en ce que le système de chauffage (4) est un chauffage à résistance.
  7. Dispositif (5) selon la revendication 5 ou 6, caractérisé en ce que le système de chauffage (4) s'étend en spirale autour de l'au moins une buse (2).
EP15729747.4A 2014-07-03 2015-05-18 Procédé et dispositif pour couler au moins une pièce Active EP3164236B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA50465/2014A AT515970B1 (de) 2014-07-03 2014-07-03 Verfahren und Vorrichtung zum Gießen zumindest eines Bauteils
PCT/AT2015/050126 WO2016000007A1 (fr) 2014-07-03 2015-05-18 Procédé et dispositif pour couler au moins une pièce

Publications (2)

Publication Number Publication Date
EP3164236A1 EP3164236A1 (fr) 2017-05-10
EP3164236B1 true EP3164236B1 (fr) 2021-10-20

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP15729747.4A Active EP3164236B1 (fr) 2014-07-03 2015-05-18 Procédé et dispositif pour couler au moins une pièce

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EP (1) EP3164236B1 (fr)
AT (1) AT515970B1 (fr)
WO (1) WO2016000007A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002030596A1 (fr) * 2000-10-13 2002-04-18 Commonwealth Scientific And Industrial Research Organisation Dispositif de coulage sous haute pression
US20040151799A1 (en) * 2002-12-20 2004-08-05 Gellert Jobst U. Lateral gating injection molding apparatus
DE102006041514A1 (de) * 2006-08-28 2008-03-06 Gerhard Schoch Energiespardüse für eine Warmkammer-Druckgießmaschine

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2542875A1 (de) * 1975-09-25 1977-03-31 Siemens Ag Verfahren zum angusslosen spritzen von thermoplastteilen
JP3817786B2 (ja) * 1995-09-01 2006-09-06 Ｔｋｊ株式会社 合金製品の製造方法及び装置
US6840302B1 (en) * 1999-04-21 2005-01-11 Kobe Steel, Ltd. Method and apparatus for injection molding light metal alloy
US6938669B2 (en) * 2001-08-30 2005-09-06 Denso Corporation Metal molding method and apparatus
DE102005042867A1 (de) * 2005-09-08 2007-03-22 Bühler Druckguss AG Druckgiessverfahren
AT512229B1 (de) * 2011-11-10 2014-10-15 Mold Thix Consulting Bueltermann Gmbh Vorrichtung, anlage und verfahren zum druckgiessen von metallischem material im thixotropen zustand
DE102012102549A1 (de) * 2011-11-15 2013-05-16 Ferrofacta Gmbh Druckgussdüse und Verfahren zum Betrieb der Druckgussdüse
DE102012009790A1 (de) * 2012-05-18 2013-11-21 Gebr. Krallmann Gmbh Verfahren zum Spritzgießen einer flüssigen Metall-Komponente und Düse zum SpritzenMetall

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002030596A1 (fr) * 2000-10-13 2002-04-18 Commonwealth Scientific And Industrial Research Organisation Dispositif de coulage sous haute pression
US20040151799A1 (en) * 2002-12-20 2004-08-05 Gellert Jobst U. Lateral gating injection molding apparatus
DE102006041514A1 (de) * 2006-08-28 2008-03-06 Gerhard Schoch Energiespardüse für eine Warmkammer-Druckgießmaschine

Also Published As

Publication number Publication date
WO2016000007A1 (fr) 2016-01-07
EP3164236A1 (fr) 2017-05-10
AT515970A1 (de) 2016-01-15
AT515970B1 (de) 2018-11-15

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