EP0421039B1 - Verfahren zum Druckgiessen von metallischen Gegenständen unter Verwendung eines verlorenen Schaumkunststoffmodells - Google Patents

Verfahren zum Druckgiessen von metallischen Gegenständen unter Verwendung eines verlorenen Schaumkunststoffmodells Download PDF

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Publication number
EP0421039B1
EP0421039B1 EP89420446A EP89420446A EP0421039B1 EP 0421039 B1 EP0421039 B1 EP 0421039B1 EP 89420446 A EP89420446 A EP 89420446A EP 89420446 A EP89420446 A EP 89420446A EP 0421039 B1 EP0421039 B1 EP 0421039B1
Authority
EP
European Patent Office
Prior art keywords
metal
mpa
pressure
mould
value
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.)
Expired - Lifetime
Application number
EP89420446A
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English (en)
French (fr)
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EP0421039A1 (de
Inventor
Michel Garat
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.)
Rio Tinto France SAS
Original Assignee
Aluminium Pechiney SA
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 Aluminium Pechiney SA filed Critical Aluminium Pechiney SA
Publication of EP0421039A1 publication Critical patent/EP0421039A1/de
Application granted granted Critical
Publication of EP0421039B1 publication Critical patent/EP0421039B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B22D18/00—Pressure casting; Vacuum casting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/02—Sand moulds or like moulds for shaped castings
    • B22C9/04—Use of lost patterns
    • 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

Definitions

  • the present invention relates to a lost foam and pressure molding process for aluminum and aluminum alloy parts according to the preamble of claim 1.
  • This request teaches that after filling the mold with the molten metal, that is to say when the model has been completely destroyed by the metal, that the vapors emitted by the foam have been evacuated, and preferably before as the solidification of the metal does not begin, an isostatic gas pressure is exerted on the whole of the mold and of the metal. This pressure is applied according to increasing values over time in order to avoid the phenomenon of watering and so that the maximum value is reached in less than 15 seconds.
  • the molded parts obtained have an increased compactness which results in an improvement in the mechanical characteristics, in particular in terms of resistance.
  • the document FR-A-2254387 describes a process for molding metals in which pressures between 2 and 25 MPa are applied, but this process applies to metals having a melting temperature above 1000 ° C. and n is not part of the lost foam molding.
  • the present invention which consists of a lost foam and pressure molding process for aluminum parts and its alloys, in which an organic foam model of the part to be molded is immersed in a mold whose walls are delimited. by a dry sand bath containing no bonding agent, the mold is filled with the metal in the liquid state which replaces the foam and gradually solidifies and an increasing isostatic gas pressure is applied simultaneously to the mold and the metal at the earliest at the end of filling, characterized in that, in order to increase the fatigue life of said parts, the pressure exerted rises to a value between 1.5 and 10 MPa, a value which is reached before the amount of solidified metal exceeds 90% by weight.
  • the invention consists in using pressures between 1.5 and 10 MPa and preferably between 5 and 10 MPa.
  • the pressurization can be carried out using a sealed box in which the mold is placed, said box being equipped with one or more pipes distributed suitably on its wall and connected to a source of pressurized gas.
  • the pressure is mainly used to accelerate the flow of liquid metal between the dendrites of the metal being solidified and the effect stops when the solid network has reached a certain development .
  • these low pressures allow the counterweight to act effectively to avoid the phenomenon of shrinkage due to the contraction of the metal during solidification.
  • Figure 1 attached is a micrograph of an alloy A-S7G03 molded according to the invention under a pressure of 7 MPa, then heat treated. This micrograph reveals the plastic deformation imposed on the dendritic network and which has the effect of filling the porosities, and illustrates well the forging effect to which the metal is subjected in this process.
  • This new pressure range is preferably applied before the quantity of solidified metal reaches 40% by weight so as to be able to act on the liquid flow.
  • the application of the pressure be made by progressive increase in particular at the start of solidification in order to avoid watering ", phenomenon which results from a transient imbalance between pressure exerted directly on the metal and the pressure exerted on the metal by means of the sand bath.
  • the bath causes a relatively large pressure drop in the transmission of pressure and this results, at the level of the metal in contact with the sand, a tendency of this pressure to drive the metal through the grains of sand and to cause a deformation of the molded part.
  • the invention can be illustrated using the following example of application: Cylindrical bodies with an outside diameter of 45mm, a wall thickness of 4mm, having adjacent ribs and bosses of 20x20x80mm were molded according to the prior process and that of the invention, that is to say applied inside the enclosure containing the mold and just before solidification begins, an isostatic gas pressure corresponding respectively to atmospheric pressure, 1 MPa, 5 MPa and 10 MPa.
  • the fatigue life F in MPA was measured from tests in rotary bending on a test piece machined at 107 cycles according to the staircase method. F is valid for both thick and thin areas, since it does not depend on the speed of solidification but on the porosity and therefore on the pressure applied.

Landscapes

  • Mechanical Engineering (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Powder Metallurgy (AREA)
  • Forging (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Measuring Fluid Pressure (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Mold Materials And Core Materials (AREA)
  • Continuous Casting (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Treatments Of Macromolecular Shaped Articles (AREA)

Claims (3)

  1. Verfahren zum Gießen von Werkstücken aus Aluminium und seinen Legierungen mit verlorenem Schaum und unter Druck, bei dem man ein Modell aus organischem Schaum des zu gießenden Werkstücks in eine Form eintaucht, deren Wände durch ein Trockensandbad, das kein Bindemittel enthält, begrenzt sind, die Form mit dem Metall im flüssigen Zustand füllt, das den Schaum ersetzt und nach und nach erstarrt, und einen wachsenden isostatischen Gasdruck gleichzeitig auf die Form und das Metall frühestens am Ende der Füllung einwirken läßt,
    dadurch gekennzeichnet, daß
    zwecks Erhöhung der Festigkeit gegenüber der Ermüdung der Werkstücke der ausgeübte Druck bis auf einen Wert zwischen > 1,5 und ≦ 10 MPa steigt, welcher Wert erreicht wird, bevor die Menge erstarrten Metalls 90 Gew.% übersteigt.
  2. Verfahren nach dem Anspruch 1,
    dadurch gekennzeichnet, daß
    der ausgeübte Druck bis auf einen Wert zwischen 5 und 10 MPa steigt.
  3. Verfahren nach dem Anspruch 1,
    dadurch gekennzeichnet, daß
    man den Druck spätestens einwirken läßt, wenn die Menge erstarrten Metalls 40 Gew.% erreicht.
EP89420446A 1989-09-07 1989-11-16 Verfahren zum Druckgiessen von metallischen Gegenständen unter Verwendung eines verlorenen Schaumkunststoffmodells Expired - Lifetime EP0421039B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8911943 1989-09-07
FR8911943A FR2651453B2 (fr) 1989-09-07 1989-09-07 Perfectionnement au procede de moulage a mousse perdue et sous pression de pieces metalliques.

Publications (2)

Publication Number Publication Date
EP0421039A1 EP0421039A1 (de) 1991-04-10
EP0421039B1 true EP0421039B1 (de) 1993-07-14

Family

ID=9385393

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89420446A Expired - Lifetime EP0421039B1 (de) 1989-09-07 1989-11-16 Verfahren zum Druckgiessen von metallischen Gegenständen unter Verwendung eines verlorenen Schaumkunststoffmodells

Country Status (23)

Country Link
EP (1) EP0421039B1 (de)
JP (1) JPH0626749B2 (de)
KR (1) KR930002837B1 (de)
CN (1) CN1017784B (de)
AT (1) ATE91444T1 (de)
AU (1) AU613541B2 (de)
BG (1) BG92798A (de)
BR (1) BR8906058A (de)
CA (1) CA2001845C (de)
CS (1) CS433890A3 (de)
DE (1) DE68907601T2 (de)
DK (1) DK581689A (de)
ES (1) ES2042049T3 (de)
FI (1) FI92162C (de)
FR (1) FR2651453B2 (de)
HU (1) HU209641B (de)
IE (1) IE893715A1 (de)
MX (1) MX170097B (de)
NO (1) NO174187C (de)
PL (1) PL286789A1 (de)
PT (1) PT92353A (de)
RU (1) RU1819185C (de)
YU (1) YU47519B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19718725A1 (de) * 1997-05-02 1998-11-05 Schmidt & Co Gmbh Kranz Verfahren zur Herstellung von wenigstens teilweise hohlen Metallartikeln

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6283196B1 (en) * 1997-03-18 2001-09-04 Georg Fischer Disa A/S Method, Pressure-supply member and pressure-supply system for active after-feeding of castings
US7025109B1 (en) * 2005-04-06 2006-04-11 Gm Global Technology Operations, Inc. Method and apparatus for controlling dispersion of molten metal in a mold cavity
AT503391B1 (de) * 2006-04-04 2008-10-15 O St Feingussgesellschaft M B Verfahren zum feingiessen von metallischen formteilen und vorrichtung hierfür
CN101733387B (zh) * 2010-01-21 2012-11-07 安徽中兴华汉机械有限公司 铝合金消失模的低压铸造方法
DE102012006572A1 (de) * 2012-01-25 2013-07-25 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verfahren zur Herstellung komplex geformter Gussteile mit einer Druckgießmaschine
WO2016100598A1 (en) * 2014-12-19 2016-06-23 Maynard Steel Casting Company Steel foam and method for manufacturing steel foam

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR887120A (fr) * 1941-11-19 1943-11-04 Silumin Ges M B H Procédé de moulage
US3420291A (en) * 1965-12-29 1969-01-07 Trw Inc Method for reducing metal casting porosity
DE2358719A1 (de) * 1973-11-26 1975-06-05 Dso Metalurgia Rudodobiv Verfahren und vorrichtung zum giessen von metallen und metall-legierungen
GB1450066A (en) * 1973-12-12 1976-09-22 Dso Metallurg I Rudodobiv Casting
FR2606688B1 (fr) * 1986-11-17 1989-09-08 Pechiney Aluminium Procede de moulage a mousse perdue de pieces metalliques
ES2034726T3 (es) * 1989-03-07 1993-04-01 Aluminium Pechiney Procedimiento de moldeo, con espuma perdida y bajo presion, de piezas metalicas.
US5088544A (en) * 1989-10-31 1992-02-18 Aluminium Pechiney Process for the lost-foam casting, under controlled pressure, of metal articles

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19718725A1 (de) * 1997-05-02 1998-11-05 Schmidt & Co Gmbh Kranz Verfahren zur Herstellung von wenigstens teilweise hohlen Metallartikeln

Also Published As

Publication number Publication date
MX170097B (es) 1993-08-06
PT92353A (pt) 1991-05-22
DE68907601D1 (de) 1993-08-19
FI92162C (fi) 1994-10-10
YU47519B (sh) 1995-10-03
CN1017784B (zh) 1992-08-12
KR930002837B1 (ko) 1993-04-10
HU209641B (en) 1994-09-28
DE68907601T2 (de) 1993-11-11
CN1049991A (zh) 1991-03-20
BG92798A (bg) 1993-12-24
NO895143D0 (no) 1989-12-20
JPH0399769A (ja) 1991-04-24
FR2651453A2 (fr) 1991-03-08
RU1819185C (ru) 1993-05-30
HU905776D0 (en) 1991-03-28
AU4538989A (en) 1991-03-14
YU168890A (sh) 1994-06-24
IE893715A1 (en) 1991-03-13
JPH0626749B2 (ja) 1994-04-13
FR2651453B2 (fr) 1994-03-25
FI895506A0 (fi) 1989-11-17
HUT57106A (en) 1991-11-28
KR910005953A (ko) 1991-04-27
ATE91444T1 (de) 1993-07-15
CA2001845A1 (fr) 1991-03-07
DK581689D0 (da) 1989-11-20
DK581689A (da) 1991-03-08
CS433890A3 (en) 1992-03-18
EP0421039A1 (de) 1991-04-10
AU613541B2 (en) 1991-08-01
ES2042049T3 (es) 1993-12-01
CA2001845C (fr) 1994-08-09
BR8906058A (pt) 1991-04-02
NO174187C (no) 1994-03-30
PL286789A1 (en) 1992-03-23
FI92162B (fi) 1994-06-30
NO895143L (no) 1991-03-08
NO174187B (no) 1993-12-20

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