EP1894648A1 - Procédé de coulée à basse pression et dispositif correspondant - Google Patents

Procédé de coulée à basse pression et dispositif correspondant Download PDF

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Publication number
EP1894648A1
EP1894648A1 EP07112730A EP07112730A EP1894648A1 EP 1894648 A1 EP1894648 A1 EP 1894648A1 EP 07112730 A EP07112730 A EP 07112730A EP 07112730 A EP07112730 A EP 07112730A EP 1894648 A1 EP1894648 A1 EP 1894648A1
Authority
EP
European Patent Office
Prior art keywords
pump
melt
pressure
mold cavity
pump tube
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.)
Granted
Application number
EP07112730A
Other languages
German (de)
English (en)
Other versions
EP1894648B1 (fr
Inventor
Alfred Sigmund
Primus Wohlmuth
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.)
Ing Rauch Fertigungstechnik GmbH
Original Assignee
Ing Rauch Fertigungstechnik 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 Ing Rauch Fertigungstechnik GmbH filed Critical Ing Rauch Fertigungstechnik GmbH
Publication of EP1894648A1 publication Critical patent/EP1894648A1/fr
Application granted granted Critical
Publication of EP1894648B1 publication Critical patent/EP1894648B1/fr
Not-in-force 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
    • B22D17/02—Hot chamber machines, i.e. with heated press chamber in which metal is melted
    • 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
    • B22D17/02—Hot chamber machines, i.e. with heated press chamber in which metal is melted
    • B22D17/04—Plunger machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D18/00—Pressure casting; Vacuum casting
    • B22D18/04—Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould
    • 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

Definitions

  • a low-pressure IPC casting method is defined as a method in which the metal is filled into the mold cavity with a few bars. This is in contrast to normal die casting, for the E. Brunhuber, "Practice of Druckgußfertigung", publisher Schiele & Schön GmbH, Berlin, 1980, p. 16 , Pressures up to 2000 bar indicates.
  • the invention has for its object to reduce the space required for performing a low-pressure casting process - even in comparison to a die casting - or to ensure a good quality of the castings.
  • devices can be after the US 6,422,294 quite space-saving to be built, only these are not able to apply a reprint and so improve the quality of the casting. But this should be possible according to the invention.
  • the pump is arranged in a furnace chamber at a distance from the bottom and from the upper melt level. Thus, space can also be saved by this arrangement again.
  • An inventive device for die casting with a mold cavity enclosing form, to which a pumped supply channel for melt from a melt supply is connected, wherein the device comprises means for applying a reprint, is characterized in that for the Nachbuchphase on the metal acting in the mold cavity, in the melt supply moving Nachbuchkolben is provided in a pressure cylinder connected to the pump tube.
  • a crucible 1 is with its bottom 2 in a furnace housing 3 shown broken away per se known type and thus forms a furnace chamber for receiving a Schmelzenvorrates, for example up to a melt level N.
  • the furnace can be designed to be arbitrary and more than one furnace chamber have, for example, as a known two-chamber furnace, whose first chamber is used for melting pigs, whereas the second, connected to the first, chamber serves as a removal chamber.
  • the oven is expediently covered with a lid 4 which has, for example, a filling opening 5.
  • a septum 6 may be provided for holding floating materials, but in the present case mainly serves to mount a cylinder 7, in which a pressure piston 8 is displaceable, which is drivable via a piston rod 9 of a drive unit 10 of known type.
  • the piston stroke can be measured via a displacement transducer of known design.
  • the cylinder 7 forms part of a supply channel 7, 11, of which the branch 11 vertically upwards to a mounted above the furnace chamber 1 formed by the crucible 1 low pressure mold 12 of two mold halves and leads one of these enclosed mold cavity 13, advantageously - as can be seen branches and so metal from the furnace chamber 1 enters the mold cavity 13.
  • the upper, protruding from the furnace part of this branch 11 may, if desired, be heated, whereas, if necessary, a cooling arrangement is provided for the mold.
  • the mold 12 and the devices for opening, closing or clamping are known per se and therefore will not be described here in detail.
  • the ratio of the inner volumes of cylinder 7 and mold 12 should be designed according to the material shrinkage in the mold cavity 13, which may be for example 5%. For this purpose, any gap losses between piston 8 and cylinder 7 - if such occur - should be taken into account.
  • the size of the latter can be controlled, for example, by means of a displacement transducer on the piston rod 9: A piston travel that exceeds the material shrinkage would be a reason for replacing the piston 8 or piston rings.
  • this metal so supplied is not supplied from the piston 8, which here only has the function of a Nachdruckkolbens, but by a pump 14 to which a pump tube 15 is connected.
  • the pump tube 15 carries the metal supplied by the pump 14 to an inlet opening 16 at the top of the cylinder 7.
  • the pump 14 driven by a motor 18 via a pump shaft 17 can in itself be any volume of metal, even under a certain low pressure a few bar, promote the pump tube 16, the cylinder 7 and the riser channel 11 in the mold cavity 13, especially when - as shown in the preferred embodiment - the piston 8 is in the rearmost position and the mouth opening 16 of the pump tube 15 in the cylinder. 7 has released. It can be seen that while the cylinder 7, which only serves more to exert a reprint, is kept relatively narrow, and it may also be shorter than shown.
  • the illustrated arrangement is preferred, in which the pressure cylinder 7 opens into the pressure cylinder 7 in a pump tube 15 which forms at least part of the feed channel 7, 11, 15.
  • the pump 14 expediently arranged both at a distance from the bottom 2 of the crucible 1 and from the upper melt level N, so as to avoid that either floating matter or soils deposited on the bottom 2 are pumped into the pump tube 15.
  • an adjusting device 19 is provided for the volume flow of melt delivered by the pump 14, so that the filling can be faster or slower. In the case of thick molding sites or sections with a large molding chamber volume, this area may then be filled up more rapidly if desired.
  • the rotational speed of the shaft 17 can be adjusted.
  • the adjusting device 19 is connected to a control 20 for the motor 18 and can change the speed of the latter, for example with a frequency converter.
  • the pump 14 Once the pump 14 has pumped the required amount of metal into the mold cavity and thus it is completely filled, it can be useful, after forming a weak solidification crust on the walls of the mold cavity 13, a pressure built up, whereby two things is achieved: On the one hand is the Metal solidified in the mold 12, on the other hand is avoided by the supply of a small amount of metal balance, that is due to shrinkage Form voids, which affect the quality of the casting.
  • the transition from the mold filling phase to the post-printing phase is automated.
  • the representation of the figure shows three possibilities, each of which can be realized individually, two or all three of them.
  • a pressure sensor 21 is provided in the riser 11 and measures the pressure exerted by the weight of the metal pumped up into the mold cavity 13. When this pressure indicates the complete filling of the mold cavity 13, the sensor 21 outputs a signal to a control device 22, which sets the drive 10 for the Nachchtkolben 8 in motion.
  • the further control of the Nachdruckkolbens via the step 22 may be conventional and time and / or away-dependent.
  • a more precise control can be used, which provides a metal front sensor (or a pressure sensor) 23 on the wall of the mold cavity (or in a channel associated therewith).
  • a sensor 23 is advantageously located at the highest point of the mold cavity (or in an associated upstream channel).
  • the sensor 23 is optionally connected to the controller 22.
  • a third possibility, for instance when using a volumetric pump 14, is that the duration of its operation as an output signal of the drive stage 20 for the motor 18 is supplied to a timer 24 which after the elapse of a predetermined pumping time applies the hold pressure via the controller 22 and the drive 10 triggers.
  • this is not absolutely necessary because the pump 14 may continue to pump without impact. It has been shown that with the switching off of the pump 14, this can be spared very.
  • connections of the sensors or encoders 21, 23, 24 to the controller 22 are shown here as having a change-over switch 25 at the input of this control, but this can certainly be modified within the scope of the invention by making such a connection either directly to the control or, for example, a weighting stage which signals from two or three of the transmitters 21, 23, 24 receives and the controller 22 triggers accordingly.
  • the illustrated embodiment in which within the furnace chamber 1 of the impression cylinder 7 via the opening 16 into the, at least a portion of the supply channel forming pump tube 15 and this opens into the pressure cylinder 7, is also of particular advantage, because the piston 8 optionally as Valve can be advanced just enough so that it covers the opening 16. If then the pump 14 is held in light movement, it acts only as a stirring member, which prevents temperature differences within the furnace chamber 1. Of course, it would also be possible to install a separate check valve, such as in the pump tube 15. But if, as preferred, the piston 8 - together with a correspondingly programmed controller 10, 22 - takes over the valve function, then play these parts 8, 10, 22 then of course the role of the valve.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Encapsulation Of And Coatings For Semiconductor Or Solid State Devices (AREA)
EP07112730A 2006-08-28 2007-07-19 Procédé de coulée à basse pression et dispositif correspondant Not-in-force EP1894648B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102006040256A DE102006040256A1 (de) 2006-08-28 2006-08-28 Niederdruck-Giessverfahren und Vorrichtung hierfür

Publications (2)

Publication Number Publication Date
EP1894648A1 true EP1894648A1 (fr) 2008-03-05
EP1894648B1 EP1894648B1 (fr) 2010-11-24

Family

ID=38819648

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07112730A Not-in-force EP1894648B1 (fr) 2006-08-28 2007-07-19 Procédé de coulée à basse pression et dispositif correspondant

Country Status (3)

Country Link
EP (1) EP1894648B1 (fr)
AT (1) ATE489183T1 (fr)
DE (2) DE102006040256A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2319638A2 (fr) 2009-11-04 2011-05-11 Heinrich G. Baumgartner Machine de moulage sous pression de métal
CN103878341A (zh) * 2014-03-27 2014-06-25 哈尔滨工业大学 大型筒形壳体铝合金铸件低压铸造缩松控制装置
DE102016123595A1 (de) 2016-12-06 2018-06-07 Carsten Speckmann Gießofen für den Niederdruckguss

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008054718B4 (de) 2008-12-16 2012-11-22 Federal-Mogul Nürnberg GmbH Gießform für den Schwerkraftguss und Schwerkraftgießverfahren

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3528691A1 (de) * 1985-08-09 1987-02-12 Interatom Verfahren und vorrichtung zum druckgiessen von fluessigmetall
US20020023728A1 (en) * 1999-03-03 2002-02-28 Hitoshi Kikuchi Fan, method for producing the fan by molding molten metal, and device for producing the fan by molding molten metal

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3437130A (en) * 1966-02-25 1969-04-08 Burt E Johnson Portable self-contained pressurized air device for casting
FR2320153A1 (fr) * 1975-08-08 1977-03-04 Alsacienne Atom Dispositif etanche de coulee des metaux fondus sur machine a mouler sous pression
DE19812068C2 (de) * 1998-03-11 2000-09-21 Gut Gieserei Umwelt Technik Gm Gießvorrichtung mit Nachverdichtung
DE19943153C1 (de) * 1998-03-19 2001-01-25 Gut Gieserei Umwelt Technik Gm Gießvorrichtung mit Nachverdichtung
DE10033902C1 (de) * 2000-07-12 2001-11-22 Vaw Ver Aluminium Werke Ag Verfahren und Vorrichtung zum steigenden Giessen mit einem auf den Giesstisch aufgesetzten Schieberverschluss
JP2003112249A (ja) * 2001-09-28 2003-04-15 Kurimoto Ltd 粒子分散アルミニウム合金の低圧鋳造法及びその装置
JP4233351B2 (ja) * 2003-02-26 2009-03-04 富士重工業株式会社 低圧鋳造法
EP1570930A1 (fr) * 2004-03-01 2005-09-07 IDRA CASTING MACHINES S.p.A. Dispositif de coulée où le métal à l'état fondu est distribué d'une zone de fusion à une zone de maintien en particulier un dispositif à basse pression
TWI386262B (zh) * 2004-09-01 2013-02-21 Commw Scient Ind Res Org 合金鑄造裝置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3528691A1 (de) * 1985-08-09 1987-02-12 Interatom Verfahren und vorrichtung zum druckgiessen von fluessigmetall
US20020023728A1 (en) * 1999-03-03 2002-02-28 Hitoshi Kikuchi Fan, method for producing the fan by molding molten metal, and device for producing the fan by molding molten metal

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2319638A2 (fr) 2009-11-04 2011-05-11 Heinrich G. Baumgartner Machine de moulage sous pression de métal
DE102009051879B3 (de) * 2009-11-04 2011-06-01 Baumgartner, Heinrich G. Metall-Druckgussmaschine
EP2319638A3 (fr) * 2009-11-04 2012-01-18 Heinrich G. Baumgartner Machine de moulage sous pression de métal
CN103878341A (zh) * 2014-03-27 2014-06-25 哈尔滨工业大学 大型筒形壳体铝合金铸件低压铸造缩松控制装置
DE102016123595A1 (de) 2016-12-06 2018-06-07 Carsten Speckmann Gießofen für den Niederdruckguss
DE102016123595B4 (de) 2016-12-06 2018-10-31 Carsten Speckmann Gießofen für den Niederdruckguss

Also Published As

Publication number Publication date
ATE489183T1 (de) 2010-12-15
EP1894648B1 (fr) 2010-11-24
DE502007005734D1 (de) 2011-01-05
DE102006040256A1 (de) 2008-03-06

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