EP2808104B1 - Soupape de moulage dotée d'un piston de colmatage - Google Patents

Soupape de moulage dotée d'un piston de colmatage Download PDF

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Publication number
EP2808104B1
EP2808104B1 EP14167787.2A EP14167787A EP2808104B1 EP 2808104 B1 EP2808104 B1 EP 2808104B1 EP 14167787 A EP14167787 A EP 14167787A EP 2808104 B1 EP2808104 B1 EP 2808104B1
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EP
European Patent Office
Prior art keywords
valve
casting
piston
melt
casting valve
Prior art date
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Active
Application number
EP14167787.2A
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German (de)
English (en)
Other versions
EP2808104A1 (fr
Inventor
Jürgen Fahrenbach
Martin Gaebges
Michael Richter
Tobias Schwarz
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.)
L Schuler GmbH
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L Schuler GmbH
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Publication of EP2808104A1 publication Critical patent/EP2808104A1/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/09—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using pressure
    • B22D27/11—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using pressure making use of mechanical pressing devices
    • 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
    • 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
    • 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
    • B22D17/203—Injection pistons
    • 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
    • B22D17/2069—Exerting after-pressure on the moulding material
    • 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
    • B22D17/2076—Cutting-off equipment for sprues or ingates
    • 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
    • B22D17/30—Accessories for supplying molten metal, e.g. in rations

Definitions

  • the invention relates to a pouring valve for supplying melt of a casting device with a valve housing, which has a melt channel connection as inlet and a valve outlet as outlet, with a valve cell for receiving the melt and with a closing means for changing the Ventilauslassqueritess Structure.
  • the invention further relates to a casting apparatus with such a casting valve and a casting method for producing castings with this casting apparatus.
  • DE 10 2007 047 545 A1 discloses a pouring valve which is closable by means of a piston.
  • the piston is axially movable in a valve housing. This gap accuracy due to concentricity errors of the piston does not lead to inhomogeneous mass flows and a reliable closing of the pouring valve is ensured, the piston skirt surface has a larger angle to the valve main axis than the valve housing in the outlet region. In the closed state, the piston thus forms an annular bearing surface with the housing wall.
  • Both latter casting valves can be used to reliably fill a casting cavity with a predetermined amount of melt.
  • melt must continue to be supplied.
  • the above-mentioned pouring valves can not close until the shrinking process has been completed, which requires heating at least until they close and makes precise metering more difficult.
  • a second mechanism is required which fills and recompresses the hollow volume resulting from the shrinkage process by means of a melt replenishment.
  • the pouring valve and the Nachverdichtungsmechanismus must be coordinated with each other, which is complex, the caster can be built expansively and thus increases the energy required for heating.
  • a die casting machine has at least one movable and one stationary mold part, which are divided along a parting plane, and a mold cavity enclosed by these mold parts.
  • a metal to be cast is injected via a runner of the mold with the aid of a casting piston.
  • the casting piston is displaceable in a casting chamber, into which the metal can be introduced, by means of a drive along the longitudinal axis of the casting chamber.
  • at least one Nachverêtrkolben acting on the injected metal is provided, which can be moved out of a cavity receiving it on the metal.
  • At least one Nachverêtrkolben is hineinbewegbar in a staggered to the longitudinal axis of the casting chamber position in the runner.
  • Object of the present invention to improve the prior art and in particular to provide a pouring valve for a casting apparatus, which avoids the disadvantages mentioned above. Furthermore, it is a particular object of the invention to provide a die-casting method for metallic melts, which enables rapid casting while minimizing the supply of heat.
  • a pouring valve for supplying melt of a pouring device, wherein the pouring valve comprises a valve housing having a melt channel connection as inlet and a valve outlet as outlet, a valve cell for receiving the melt and a closing means for changing the Ventilauslassqueritess Structure and wherein the valve cell can be connected via a melt channel connection with a melt channel, which can be prestressed by means of casting pressure, and the casting valve has a recompression piston for recompressing the melt after the mold has been filled.
  • the integration of the recompression piston as squeeze pin in the pouring valve space-saving arrangement is created, which emits relatively little heat due to their compactness. Due to the fact that the melt for the filling of the casting cavity and the melt for recompression come from the same valve cell or according to the valve outlet downstream of the valve cell, the number of required heating means and pipelines can also be kept low.
  • the valve cell of the casting valve can be connected to a melt reservoir or a casting chamber via the melt channel connection. If the pouring valve is part of a die casting device, the melt channel connection, the valve cell and the valve outlet are pressure-resistant.
  • the valve cell can also have a plurality of melt channel connections, via which the melt can flow.
  • valve cell has a plurality of melt channel connections, it can be provided that the melt flows out again during casting via at least one channel.
  • the valve cell thus does not form the end of the melt channel, but is also flowed through by melt during the casting process, which does not leave the pouring valve via the valve outlet.
  • the heating means which is arranged in or on the casting valve can be made smaller or possibly omitted entirely.
  • the pouring valve may be integrated into the die-cast channel such that the valve cell passes through a part of the melt channel can be prestressed by means of casting pressure.
  • the valve cell may have a storage volume, which is advantageously completely enclosed by the valve housing, so that it can be heated as located in the casting valve hot cell. An unwanted solidification can be easily avoided.
  • valve cell occupies a certain volume;
  • the pouring valve can be integrated in a melt channel particularly well if the cross-sectional area of the valve cell corresponds to the sum of the cross-sectional areas of the feeding melt channel connections. In this case, it is not enlarged in diameter compared to the melt channel and thus provides no additional volume
  • the pouring valve preferably has as closing means a valve piston which is movable axially in the direction of the valve outlet and can close it.
  • the valve housing and the valve piston are preferably designed so that the diameter of the effective Ventilauslassqueritess founded is steadily reduced when ancestors of the valve piston.
  • the effective Ventilauslassqueritess simulation is the surface which is flowed through during the casting vertically from the melt.
  • valve piston and the valve piston enclosing housing portion preferably form a conical valve seat.
  • At least one of the two components valve piston or housing wall thus has a chamfer or a chamfer in such a way that the Ventilauslassqueritess Structure tapers in the direction of the valve outlet.
  • the melt flow can take place through an annular opening which allows a relatively vortex-free melt flow. The effect is exacerbated when both components, the valve piston lateral surface and the housing bottom are seen in the sectional view provided with bevels.
  • the bevels do not necessarily have to be conical.
  • the housing inner wall or the piston skirt surface may be partially conical or curved in the axial direction. If the piston skirt surface or the valve seat are crowned, concentricity errors of the valve piston can be compensated particularly well, so that despite possible gap dimensions, the mass flow in the closed state is minimized.
  • the crown also causes a line contact to form between these components when closing. Jamming of the valve piston can be reliably prevented by the thus lack of surface contact and possibly remaining between the surfaces solidifying melt material, which prevents damage to the valve piston and the valve housing. In the valve gap may have penetrated melt material due to the temperature gradient to the environment cool down and melted at the valve opening for the next casting process again.
  • valve piston and the housing wall may be formed in the axial direction specific to the casting so that the tapered valve outlet cross-sectional area formed by the two components is designed so that the desired mold filling speed can be influenced by moving the valve piston.
  • a large flow cross-section may be provided, which is required for the rapid filling of the casting cavity and to avoid trapped air, which is reduced with increasing degree of filling according to the shape of the casting cavity.
  • the valve piston has a variable diameter over its axial length, with a correspondingly shaped valve housing, only a temporary reduction in the flow cross-section can take place, which is widened again before the final closing of the pouring valve.
  • valve piston and the valve outlet are preferably arranged centrally in the valve housing.
  • the valve piston drive can connect to the side facing away from the valve outlet and be integrated into the housing of the pouring valve. If the secondary compression piston can be moved via a separate drive, this can also be integrated into the valve housing.
  • the melt channel connection In order to prevent a temperature drop of the melt and thus unwanted crystallization processes, can the melt channel connection, the valve outlet or other melt-contacting areas can be made heatable in the pouring valve. Each melting section is preferably heated separately.
  • An electrically operated heater has a low inertia behavior and allows good control or regulation of the heating power.
  • the channel walls themselves may be heated or covered by coils.
  • the valve cell can also be heated.
  • the valve piston also takes over the function of Nachverêtns.
  • the same component then forms both the closing piston and the Nachverdichtungskolben.
  • the valve piston is designed, for example, as a circular cylinder which forms a valve seat with a valve housing wall.
  • the valve housing wall may initially have a conical shape and then be tubular, so that the valve piston initially throttles the melt inflow during the process in the tubular section, closes the valve upon reaching the tubular section and then recompresses during the process within the tubular section.
  • the casting valve on two pistons which are at least temporarily movable relative to each other.
  • the first piston is formed by the valve piston, with which the pouring valve is closable, and the second piston is designed as a secondary compression piston separately from the valve piston.
  • the two pistons are arranged coaxially with each other, wherein the Nachverdichtungskolben is located inside.
  • the housing wall is designed so that the valve piston in this Can move arrangement on the valve wall, is prevented from further movement and due to the smaller diameter of the Nachverdichtungskolbens whose further movement still possible.
  • the secondary compression piston may have its own piston drive for the relative movement to the valve piston. As a result, it can be controlled separately from the valve piston, and it can be matched in its performance to the recompression.
  • piston actuators for the Nachverdichtungskolben and the valve piston for example, hydraulic drives or electric spindles come into question.
  • the two piston drives can also be formed by different drive types.
  • a particularly compact pouring valve can be achieved if both pistons are movable by the same drive. Via drive valves or other control mechanisms it can be provided that only one of the pistons or both pistons are displaced simultaneously at a certain point in time. If a relative displacement is undesirable, at least in phases, as in the closing of the pouring valve, both pistons can also be connected to one another by suitable coupling means, so that they can only be moved together.
  • the two pistons are coupled to each other and can only be moved to each other by increased effort. As long as the valve piston has not moved to block and thus closes the valve seat on the valve, then move both pistons together. By the then leaps and bounds increasing force dissolves the Nachverdichtungskolben of the valve piston and can then be moved alone. A piston drive is sufficient for this variant. A complex control unit is not required in this embodiment.
  • the piston drive is preferably carried out hydraulically and is arranged for thermal reasons on the opposite side of the valve outlet.
  • the pouring valve may have the pressure force transmitting decoupling means.
  • the decoupling means are disposed between the piston heads and the piston drives and may be formed by ceramic layers or other sufficiently strong thermal insulators.
  • the heat transfer can be reduced by a suitable mechanical structure.
  • thin-walled intermediate bolts which connect the piston head to the piston drive, transmit less total heat and allow the arrangement of coolants in the spaces thus created.
  • the pouring valve according to the invention is preferably installed in a die casting apparatus for metallic melts, but can also be used in other casting methods, such as in continuous casting or casting of non-metallic melts.
  • the amount of circulating material is thereby reduces filling and recompression via the same pouring valve.
  • a casting device preferably has the pouring valve according to the invention directly on the gate area of the casting or on the casting itself.
  • the proportion of Sprue and the amount of circulating material can be further reduced.
  • casting compositions of less than 20% of the casting mass can be achieved thereby.
  • the sprue system can be compact.
  • the sprue material can be reused as circulating material. The fact that less sprue material must be melted and the hot melt in the loop is always close to the mold cavity available, less time is required for the casting cycle, so that the timing is improved.
  • the invention also relates to a method for die casting with a die casting device and a casting valve having a valve piston, which provides the following steps: providing a cleaned and prepared for a mold filling casting cavity with a closed pouring valve, opening the pouring valve for pouring, closing the pouring valve after Form Sprintde, removing the Casting and re-compression during the cooling process and before the removal of the casting by means of a built-in the pouring valve piston.
  • the proposed method allows the filling and the recompression via the same gate opening, so that the number of gate areas is reduced compared to separately arranged to the casting valve squeeze pins.
  • the required post-processing of the casting is thus reduced.
  • FIG. 1 schematically shows a part of a casting apparatus 1 for die casting of metallic melts 2 such as magnesium or aluminum melts.
  • the casting apparatus 1 has a casting chamber 4, which can be filled from a melt reservoir, not shown, via a melt valve 19.
  • the melt 2 is conveyed from the horizontally oriented casting chamber 4 by a hydraulically moved, in the horizontal advancing casting piston 6 in a melt channel 11 and pressurized.
  • the melt channel 11 is surrounded by heating means 5 in the form of coils, which prevent cooling of the melt 2. From the heated melt channel 11, the melt 2 passes through a melt channel connection 12 into the valve cell 8 (FIG. FIG. 2 ) of the pouring valve 7 and from there via the valve outlet 10 into the casting cavity 3.
  • the casting cavity 3 itself is formed by two half-molds 15, 16 and is formed in a known manner by the enlarged by the Schwindmann negative mold of the casting to be produced.
  • the half-molds 15, 16 are separable from each other at a parting surface 9, so that the finished casting can be removed.
  • FIG. 2 shows a pouring valve 7 with a valve housing 13 which has a fillable via the melt channel connection 12 valve cell 8, which is part of the melt channel 11 itself and in comparison to this and the melt channel connection 12 has no enlarged cross-section.
  • the valve piston 14 Centrally in the valve housing 13, the valve piston 14 is arranged, via which the valve outlet 10 is closed.
  • the inner wall 21 of the valve housing 13, which adjoins the Ventilauslass 10 has an inclination relative to the main valve axis 22, which is greater than that of the lateral surface 18.
  • valve piston 14 is driven by a first piston drive 24, which operates hydraulically and is arranged axially offset from the valve piston 14. Since the valve piston 14 is in contact with the hot melt 2, decoupling means 26 are provided in the form of intermediate bolts as spacers mechanically and thus thermally decouple the piston drive 24 with the piston plate 28 from the piston head 29 of the valve piston 14, but the pressure force on the Nevertheless, piston head 29 is transferred.
  • the valve piston 14 is formed as a hollow cylinder and has co-axial to the direction of a Nachverdichtungskolben 23.
  • the recompression piston 23 has a second piston drive 25 which is operable independently of the first piston drive 24. Its hydraulic chambers 30 are connected axially to those of the first piston drive 24.
  • the casting cavity 3 is closed so tightly that it withstands the melt pressure of the subsequent die casting process.
  • the inner recompression piston 23 returns to its starting position, which is set back so far from the valve piston 14 closing the valve outlet 10 that a blind hole 27 is created between the inner walls of the valve piston 14.
  • the blind hole depth corresponds approximately to the stroke of the valve piston 14th
  • valve piston 14 By retracting the valve piston 14, the actual casting process is initiated as a third phase.
  • the valve piston 14 releases from its annular valve seat, and by the now flowing, hot melt 2 is possibly at this point cooled material melted. Due to the ring-line contact and any heating located on the pouring valve 7, the solidified amount of melt is so small that it is completely melted and does not make opening the valve piston 14 difficult or only insignificantly difficult.
  • the valve outlet 10 is opened to the maximum, and the melt 2 can flow annularly between the pistons 14, 23 and the inner wall 21 of the valve housing 13 in the Gussteilkavmaschine 3. The envisaged for filling amount of melt is pushed by the advancing casting piston 6 via the melt channel 11.
  • the casting solidifies and the casting chamber 4 is prepared for a new mold filling operation.
  • the consequent shrinkage of material is compensated for by the secondary compression piston 23 which presses the melt 2 located in the blind hole 27 and the immediately adjacent region into the casting cavity. If the amount of melt required for the re-compaction 2 the Blind hole volume corresponds, the adjoining the valve outlet 10 runner can be particularly short or possibly even eliminated.
  • the solidification process can be accelerated by supplying cooling power via cooling channels.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Fuel Cell (AREA)

Claims (10)

  1. Soupape de coulée (7) pour l'amenée de masse en fusion (2) d'un dispositif de coulée (1), comportant :
    - un boîtier de soupape (13) qui comporte un raccord de canal de masse en fusion (12) en tant qu'admission et une sortie de soupape (10) en tant qu'écoulement,
    - un compartiment de soupape (8) pour recevoir la masse en fusion (2),
    - un moyen de fermeture pour modifier la surface de section transversale de la sortie de la soupape, où
    - le compartiment de soupape (8) est apte à être connecté via un raccord de canal de masse en fusion (12) avec un canal de masse en fusion (11) apte à être pressurisé au moyen d'une pression de coulée et
    - la soupape de coulée (7) comporte un piston de post-compression (23) pour la post-compression de la masse en fusion (2) après la fin du remplissage du moule.
  2. Soupape de coulée selon la revendication 1, caractérisée en ce que le moyen de fermeture est conçu comme un piston de soupape (14) et forme un siège de soupape conique avec une partie de la paroi intérieure (21) du boîtier de soupape (13).
  3. Soupape de coulée selon la revendication 2, caractérisée en ce que la partie conique de la paroi intérieure (21) est tronconique et que le piston de soupape (14) comporte une surface d'enveloppe de piston (18) sphérique qui forme un contact linéaire avec la paroi intérieure (21) lors de la fermeture.
  4. Soupape de coulée selon la revendication 2 ou 3, caractérisée en ce que la soupape de coulée (7) comporte un piston de post-compression (23) qui est disposé de manière coaxiale avec le piston de soupape (7) et est déplaçable par rapport à ce dernier.
  5. Soupape de coulée selon la revendication 4, caractérisée en ce que la soupape de coulée (7) comporte des entraînements de piston (24, 25) séparés pour les pistons (17,23).
  6. Soupape de coulée selon la revendication 5, caractérisée en ce que l'un des entraînements de piston (24, 25) est conçu comme un entraînement hydraulique.
  7. Soupape de coulée selon la revendication 1, caractérisée en ce que la soupape de coulée (7) comporte un moyen de chauffage (5) pour chauffer le compartiment de soupape (8).
  8. Soupape de coulée selon la revendication 1, caractérisée en ce que la soupape de coulée (7) comporte un moyen de découplage thermique (26) pour découpler thermiquement le piston de soupape (17) de l'entraînement de piston (24).
  9. Dispositif de coulée (1) pour un moulage sous pression avec une cavité de pièce moulée (3) et une soupape de coulée (7) selon l'une quelconque des revendications précédentes, caractérisé en ce que la soupape de coulée (7) est disposée directement au niveau de la région d'attaque ou directement au niveau de la cavité de pièce moulée (3).
  10. Procédé de moulage sous pression avec un dispositif de coulée (1) et une soupape de coulée (7) comportant un piston de soupape (14), comportant les étapes suivantes :
    - mise à disposition d'une cavité de pièce moulée (3) nettoyée et préparée pour un processus de remplissage du moule, la soupape de coulée (7) étant fermée,
    - ouverture de la soupape de coulée (7) pour le coulage,
    - fermeture de la soupape de coulée (7) après la fin du remplissage du moule,
    - prélèvement de la pièce moulée, caractérisé en ce que
    - une post-compression est réalisée au moyen d'un piston de post-compression (23) intégré dans la soupape de coulée (7) pendant le processus de refroidissement et avant le prélèvement de la pièce moulée.
EP14167787.2A 2013-05-27 2014-05-09 Soupape de moulage dotée d'un piston de colmatage Active EP2808104B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102013105435.8A DE102013105435B3 (de) 2013-05-27 2013-05-27 Gießventil mit einem Nachverdichtungskolben

Publications (2)

Publication Number Publication Date
EP2808104A1 EP2808104A1 (fr) 2014-12-03
EP2808104B1 true EP2808104B1 (fr) 2016-11-23

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EP14167787.2A Active EP2808104B1 (fr) 2013-05-27 2014-05-09 Soupape de moulage dotée d'un piston de colmatage

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US (2) US9457400B2 (fr)
EP (1) EP2808104B1 (fr)
CN (1) CN104308115B (fr)
DE (1) DE102013105435B3 (fr)
ES (1) ES2609381T3 (fr)

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DE102013105435B3 (de) * 2013-05-27 2014-07-10 Schuler Pressen Gmbh Gießventil mit einem Nachverdichtungskolben
DE102013105433B3 (de) 2013-05-27 2014-05-22 Schuler Pressen Gmbh Gießvorrichtung mit einer Ringleitung und Gießverfahren
DE102014205388A1 (de) * 2014-03-24 2015-09-24 Bayerische Motoren Werke Aktiengesellschaft Vorrichtung zum Druckgießen eines metallischen Bauteils
DE102014111032B3 (de) * 2014-08-04 2015-10-01 Schuler Pressen Gmbh Gießventil und Gießvorrichtung
JP6455840B2 (ja) * 2015-09-07 2019-01-23 株式会社アルテックス スクイズピン動作判定装置及びスクイズピン動作判定方法
JP7254619B2 (ja) * 2019-05-17 2023-04-10 芝浦機械株式会社 ダイカストマシン
JP7556710B2 (ja) * 2020-06-30 2024-09-26 株式会社キッツ バルブのボデーとバルブのボデーの製造方法
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CN114030143B (zh) * 2021-11-17 2022-07-22 徐州云泰精密技术有限公司 一种冲裁集电环水口装置

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Also Published As

Publication number Publication date
EP2808104A1 (fr) 2014-12-03
US9643245B2 (en) 2017-05-09
CN104308115B (zh) 2018-11-09
US9457400B2 (en) 2016-10-04
DE102013105435B3 (de) 2014-07-10
CN104308115A (zh) 2015-01-28
ES2609381T3 (es) 2017-04-20
US20140345824A1 (en) 2014-11-27
US20160129500A1 (en) 2016-05-12

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