US20070215307A1 - Method for Manufacturing Cast Parts - Google Patents

Method for Manufacturing Cast Parts Download PDF

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Publication number
US20070215307A1
US20070215307A1 US11/547,792 US54779205A US2007215307A1 US 20070215307 A1 US20070215307 A1 US 20070215307A1 US 54779205 A US54779205 A US 54779205A US 2007215307 A1 US2007215307 A1 US 2007215307A1
Authority
US
United States
Prior art keywords
gas
melt
cavity
cast parts
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.)
Abandoned
Application number
US11/547,792
Other languages
English (en)
Inventor
Lothar Kallien
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of US20070215307A1 publication Critical patent/US20070215307A1/en
Abandoned legal-status Critical Current

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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
    • 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
    • B22D27/13—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using pressure making use of gas pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D7/00—Casting ingots, e.g. from ferrous metals
    • B22D7/04—Casting hollow ingots

Definitions

  • the invention relates to a method for manufacturing cast parts out of light-metal alloys, in particular via pressure diecasting, according to the preamble of the claim.
  • DE-A-3240242 describes a method for pressure diecasting with the simultaneous exposure to gas counter-pressure.
  • the characteristic feature is that the casting mold cavity and a horizontal pressure chamber are separated before the casting process tarts, after which a gas pressure is generated in the casting mold cavity, and the melt is simultaneously poured into the horizontal pressure chamber, while the cavity and horizontal pressure chamber space are connected as casting begins.
  • the gas pressure is independent of melt flow.
  • DE-OS 2823173 discloses a method for casting metal in a rotating die set, in which the surface of the metal melt is simultaneously protected by liquefied inert gas during the casting process.
  • the gas is poured both on the melt surface and inside the rotating mold.
  • a first metal is cast, pressed against the mold wall via centrifugation, and solidifies with the formation of a first, outer layer, after which the supply of a liquid gas is initiated.
  • a second layer is subsequently cast.
  • the additionally supplied liquid gas fills the inner cavity of the mold until a finished turned piece is obtained.
  • the object of the invention is to develop a method for manufacturing cast parts while avoiding the disadvantages of prior art, in particular for cast parts made out of light-metal alloys and according to a pressure diecasting process.
  • the invention here proceeds from known injection-molding methods for plastic parts, in which cavities with a uniform interior gas pressure in the cavity are generated by injecting a gas. Because the thermophysical properties relative to thermoplastics differ greatly during the solidification of metal melts, these methods cannot be simply applied during the pressure diecasting of metal cast parts. Not only are the operating temperatures higher, solidification proceeds much faster, so that a casting cycle proceeds significantly faster.
  • the method involving gas injection can be implemented via
  • any other inert gas is also suitable.
  • alloys with a short solidification interval are preferably used, e.g., zinc, aluminum or magnesium alloys.
  • a local post-pressure can ward off sink marks and/or warping.
  • the solidification front of the metal solidifies during exposure to gas pressure. This results in the formation of smooth, solidified walls. This aspect is if utmost importance for the subsequent use of hollow cast parts as a line that carries media, whether it be gas or liquid, since the flow resistance is greatly diminished by how smooth the walls are on the inner surface.
  • Possible outcomes include a reduction in cycle time for thick-walled parts, improved stability, firing force owing to a uniform pressure, and minimized warping resulting from reduced material accumulations.
  • Lightweight cast parts can be obtained, e.g., door handles or oil filter casings.
  • the metal melt located in the casting chamber 1 of a pressure diecasting machine is pressed into a mold cavity 2 by means of a casting piston by way of an optional valve 6 (the method can also be implemented without using a valve 6 ).
  • Another valve 7 for a secondary cavity 4 is closed.
  • a gas injector 3 introduces nitrogen into the mold cavity 2 , or in the remaining melt, and the valve 7 of the secondary cavity 4 is opened at the same time.
  • the valve 6 is now closed.
  • the remaining quantity of metal melt is forced by the gas pressure into the secondary cavity 4 .
  • At least one hollow space 5 is formed in the mold cavity 2 or cast part.
  • the cavities are subsequently ventilated via the gas injector 3 , after which the cast part can be removed from the mold and further processed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
US11/547,792 2004-04-05 2005-04-01 Method for Manufacturing Cast Parts Abandoned US20070215307A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102004017387.7 2004-04-05
DE102004017387A DE102004017387A1 (de) 2004-04-05 2004-04-05 Verfahren zur Herstellung von Gussteilen
PCT/IB2005/000899 WO2005097378A2 (de) 2004-04-05 2005-04-01 Verfahren zur herstellung von gussteilen

Publications (1)

Publication Number Publication Date
US20070215307A1 true US20070215307A1 (en) 2007-09-20

Family

ID=34962633

Family Applications (1)

Application Number Title Priority Date Filing Date
US11/547,792 Abandoned US20070215307A1 (en) 2004-04-05 2005-04-01 Method for Manufacturing Cast Parts

Country Status (5)

Country Link
US (1) US20070215307A1 (de)
EP (1) EP1753564A2 (de)
JP (1) JP2007531630A (de)
DE (1) DE102004017387A1 (de)
WO (1) WO2005097378A2 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012108079B3 (de) * 2012-08-31 2013-11-14 Hochschule Aalen Verfahren zur Herstellung hohler Salzkerne
DE102021111538A1 (de) * 2021-05-04 2022-11-10 Nemak, S.A.B. De C.V. Gießvorrichtung und Verfahren zum Gießen

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5423667A (en) * 1989-04-21 1995-06-13 Ferromatik Milacron Maschinenbau Gmbh Apparatus for the injection molding of fluid-filled plastic bodies
US5928677A (en) * 1995-11-25 1999-07-27 Battenfeld Gmbh Apparatus for producing hollow plastic objects with pressurized gas injection after overflow cut-off
US5997799A (en) * 1995-01-27 1999-12-07 U.S. Philips Corporation Method for injection-moulding a hollow product using a pressure variation between two gas volumes
US6953546B2 (en) * 2001-07-10 2005-10-11 Cinpres Gas Injection Ltd. Plastic expulsion process for forming hollow tubular products

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8315615D0 (en) * 1983-06-07 1983-07-13 Worswick Eng Ltd Alan Casting hollow articles
JP2791421B2 (ja) * 1989-10-05 1998-08-27 旭化成工業株式会社 中空型物の成形方法
JPH04210861A (ja) * 1990-11-30 1992-07-31 Aaru Pii Toupura Kk パイプ製品の製造方法
JP3441043B2 (ja) * 1997-03-28 2003-08-25 新東工業株式会社 低融点金属中子の製造方法
JP2000263212A (ja) * 1999-03-17 2000-09-26 Aisin Takaoka Ltd 中空部をもつ鋳造品の製造方法及びこれに使用できる装置
DE10007994C2 (de) * 2000-02-22 2003-11-13 Battenfeld Gmbh Verfahren und Vorrichtung zum Spritzgiessen von mindestens einen Hohlraum aufweisenden Formteilen
TW548173B (en) * 2001-07-10 2003-08-21 Cinpres Gas Injection Ltd Process and apparatus for injection moulding a hollow plastics article

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5423667A (en) * 1989-04-21 1995-06-13 Ferromatik Milacron Maschinenbau Gmbh Apparatus for the injection molding of fluid-filled plastic bodies
US5997799A (en) * 1995-01-27 1999-12-07 U.S. Philips Corporation Method for injection-moulding a hollow product using a pressure variation between two gas volumes
US5928677A (en) * 1995-11-25 1999-07-27 Battenfeld Gmbh Apparatus for producing hollow plastic objects with pressurized gas injection after overflow cut-off
US6953546B2 (en) * 2001-07-10 2005-10-11 Cinpres Gas Injection Ltd. Plastic expulsion process for forming hollow tubular products

Also Published As

Publication number Publication date
WO2005097378A3 (de) 2006-04-06
WO2005097378A2 (de) 2005-10-20
EP1753564A2 (de) 2007-02-21
JP2007531630A (ja) 2007-11-08
DE102004017387A1 (de) 2005-10-20

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STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION