EP0421039A1 - 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
EP0421039A1
EP0421039A1 EP89420446A EP89420446A EP0421039A1 EP 0421039 A1 EP0421039 A1 EP 0421039A1 EP 89420446 A EP89420446 A EP 89420446A EP 89420446 A EP89420446 A EP 89420446A EP 0421039 A1 EP0421039 A1 EP 0421039A1
Authority
EP
European Patent Office
Prior art keywords
metal
pressure
mpa
mold
lost foam
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
EP89420446A
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English (en)
French (fr)
Other versions
EP0421039B1 (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 metal parts, in particular aluminum and its alloys.
  • This technique has proven to be attractive on an industrial scale, because it avoids the prior manufacture, by compacting and agglomeration of powdery refractory materials, of rigid molds associated in a more or less complicated way with cores via channels. , and that it allows easy recovery of the molded parts as well as easy recycling of the molding materials.
  • this technique is handicapped by two factors: -the relative slowness of solidification which promotes the formation of gassing pits -the relative weakness of the thermal gradients which can cause micro-back-up if the layout of the part makes its weighting difficult.
  • 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 the solidification of the metal does not start, we exercise on the whole of the mold and of the metal an isostatic gas pressure. 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 present invention which consists of a lost foam and pressure molding process of metal parts, in particular aluminum 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 simultaneously applied to the mold and the metal as soon as possible at the end of the filling, characterized in that the pressure exerted rises to a value between 1.5 and 10 MPa.
  • 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 A-S7G03 alloy 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 maximum pressure applied is reached before the quantity of solidified metal does not exceed 90% in order to be able to benefit fully from the deformation effect.
  • the application of the pressure is done by progressive increase in particular at the beginning of the solidification in order to avoid the "watering", phenomenon which results from a transient imbalance between the pressure exerted directly on the metal and the pressure exerted on the metal via the sand bath.
  • the bath causes a relatively large pressure drop in the transmission of pressure and the result is, at the level of the metal in contact with the sand, a tendency of this pressure to expel the metal through the grains of sand and to cause deformation of the molded part.
  • the invention can be illustrated using the following example of application: Cylindrical hollow bodies with an outside diameter of 45 mm, a wall thickness of 4 mm, with adjacent ribs and bosses of 20 x 20 x 80 mm were molded according to the prior process and that of the invention, that is to say that is to say, 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.
  • These bodies were made from two types of alloys with high mechanical characteristics: - A-S7G03 of composition by weight% FeO, 20; Si 6.5-7.5; CuO, 10; ZnO, 10; MgO, 25-0.40; MnO, 10; NiO, 05; PbO, 05; SnO, 05; TiO, 05-0.20; balance Al; - A-U5GT of composition: FeO, 35; SiO, 20; Cu 4.20-5.00; ZnO, 10; MgO, 15-0.35; MnO, 10; NiO, 05; PbO, 05; SnO, 05; TiO, 05-0.30; balance Al;
  • the fatigue life F in MPA was measured from rotary bending tests 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

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (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)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Measuring Fluid Pressure (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Treatments Of Macromolecular Shaped Articles (AREA)
  • Continuous Casting (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Mold Materials And Core Materials (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Adhesives Or Adhesive Processes (AREA)
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
FR8911943A FR2651453B2 (fr) 1989-09-07 1989-09-07 Perfectionnement au procede de moulage a mousse perdue et sous pression de pieces metalliques.
FR8911943 1989-09-07

Publications (2)

Publication Number Publication Date
EP0421039A1 true EP0421039A1 (de) 1991-04-10
EP0421039B1 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
EP1842607A3 (de) * 2006-04-04 2007-10-17 O. St. Feingussgesellschaft m. b. H. Verfahren zum Feingiessen von metallischen Formteilen und Vorrichtung hierfür

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2167740C1 (ru) * 1997-03-18 2001-05-27 Георг Фишер Диса А/С Способ активной подпитки отливок в литейных формах, устройство для подачи давления и система подачи давления для активной подпитки отливок
DE19718725A1 (de) * 1997-05-02 1998-11-05 Schmidt & Co Gmbh Kranz Verfahren zur Herstellung von wenigstens teilweise hohlen Metallartikeln
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
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
DE102012006572B4 (de) * 2012-01-25 2026-05-21 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verwendung einer verlorenen Form in einem Verfahren zur Herstellung komplex geformter Gussteile mit einer Druckgießmaschine
EP3233334B1 (de) * 2014-12-19 2020-10-07 Roshan, Hathibelagal, M. Stahlschaumstoff und verfahren zur herstellung eines stahlschaumstoffes

Citations (5)

* 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
FR2254387A1 (de) * 1973-12-12 1975-07-11 Dso Metalurgia Rudodobiv
EP0274964A1 (de) * 1986-11-17 1988-07-20 Aluminium Pechiney Verfahren zum Giessen von metallischen Gegenständen unter Verwendung eines verlorenen Schaumkunststoffmodells

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0386384B1 (de) * 1989-03-07 1992-09-30 Aluminium Pechiney Verfahren zum Vollformgiessen von metallischen Gegenständen unter Druck
US5088544A (en) * 1989-10-31 1992-02-18 Aluminium Pechiney Process for the lost-foam casting, under controlled pressure, of metal articles

Patent Citations (5)

* 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
FR2254387A1 (de) * 1973-12-12 1975-07-11 Dso Metalurgia Rudodobiv
EP0274964A1 (de) * 1986-11-17 1988-07-20 Aluminium Pechiney Verfahren zum Giessen von metallischen Gegenständen unter Verwendung eines verlorenen Schaumkunststoffmodells

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1842607A3 (de) * 2006-04-04 2007-10-17 O. St. Feingussgesellschaft m. b. H. Verfahren zum Feingiessen von metallischen Formteilen und Vorrichtung hierfür

Also Published As

Publication number Publication date
YU47519B (sh) 1995-10-03
ATE91444T1 (de) 1993-07-15
YU168890A (sh) 1994-06-24
FI92162C (fi) 1994-10-10
HUT57106A (en) 1991-11-28
ES2042049T3 (es) 1993-12-01
CN1049991A (zh) 1991-03-20
NO895143D0 (no) 1989-12-20
FI92162B (fi) 1994-06-30
BR8906058A (pt) 1991-04-02
FR2651453B2 (fr) 1994-03-25
AU613541B2 (en) 1991-08-01
CN1017784B (zh) 1992-08-12
MX170097B (es) 1993-08-06
JPH0399769A (ja) 1991-04-24
DE68907601T2 (de) 1993-11-11
FR2651453A2 (fr) 1991-03-08
NO174187B (no) 1993-12-20
DK581689D0 (da) 1989-11-20
KR910005953A (ko) 1991-04-27
CA2001845A1 (fr) 1991-03-07
AU4538989A (en) 1991-03-14
NO895143L (no) 1991-03-08
BG92798A (bg) 1993-12-24
FI895506A0 (fi) 1989-11-17
NO174187C (no) 1994-03-30
PL286789A1 (en) 1992-03-23
CA2001845C (fr) 1994-08-09
JPH0626749B2 (ja) 1994-04-13
DE68907601D1 (de) 1993-08-19
EP0421039B1 (de) 1993-07-14
CS433890A3 (en) 1992-03-18
IE893715A1 (en) 1991-03-13
PT92353A (pt) 1991-05-22
HU905776D0 (en) 1991-03-28
DK581689A (da) 1991-03-08
HU209641B (en) 1994-09-28
KR930002837B1 (ko) 1993-04-10
RU1819185C (ru) 1993-05-30

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