EP0386384B1 - Procédé de moulage à mousse perdue et sous pression de pièces métalliques - Google Patents

Procédé de moulage à mousse perdue et sous pression de pièces métalliques Download PDF

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Publication number
EP0386384B1
EP0386384B1 EP89420215A EP89420215A EP0386384B1 EP 0386384 B1 EP0386384 B1 EP 0386384B1 EP 89420215 A EP89420215 A EP 89420215A EP 89420215 A EP89420215 A EP 89420215A EP 0386384 B1 EP0386384 B1 EP 0386384B1
Authority
EP
European Patent Office
Prior art keywords
pressure
sand
metal
pattern
mpa
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
EP89420215A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0386384A1 (fr
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
Priority claimed from FR898903706A external-priority patent/FR2644087B2/fr
Application filed by Aluminium Pechiney SA filed Critical Aluminium Pechiney SA
Priority to AT89420215T priority Critical patent/ATE81044T1/de
Publication of EP0386384A1 publication Critical patent/EP0386384A1/fr
Application granted granted Critical
Publication of EP0386384B1 publication Critical patent/EP0386384B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • 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
    • 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
    • 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
    • B22C9/046—Use of patterns which are eliminated by the liquid metal in the mould
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D2/00—Arrangement of indicating or measuring devices, e.g. for temperature or viscosity of the fused mass

Definitions

  • the present invention relates to a lost foam and pressure molding process for metal parts, in particular aluminum and its alloys.
  • the Applicant had improved it in the sense that when the mold had been completely filled, that is to say when the metal had entirely replaced the model and the major part of the vapors had been evacuated, it applied a gas pressure on the mold; this operation can be carried out by placing the mold in an enclosure capable of withstanding the pressure and connected to a source of pressurized gas. This operation could be done immediately after filling while the metal was still completely liquid, but it could still take place later as long as the solidified fraction of metal in the mold did not exceed 40%, value beyond which the pressure would have had a negligible effect.
  • the value of the pressure applied was at most between 0.5 and 1.5 MPa: a value less than 0.5 MPa being of insufficient effect and a value greater than 1.5 MPa resulting high operating costs. It was then observed that the compactness of the parts was considerably increased by eliminating or at least reducing gassing pits and micro-shrinkage and thus improving their mechanical characteristics. However, this caused the appearance of a new drawback called "watering".
  • the value of this speed is between 0.003 and 0.3 MPa per second and the smaller the thickness of the part, the greater the speed values outside this range, making one or more the other of the two drawbacks.
  • This speed must obviously take into account the pressure drop across the mold, that is to say the grain size of the sand and also the depth of immersion of the model in the sand. This is why it is chosen as a function of these parameters and so as to obtain overpressure values of between 0.001 and 0.030 MPa and preferably between 0.002 and 0.010 MPa.
  • This overpressure is necessary only during a critical period immediately following the filling of the room and when the film is still saturated with products which are not completely vaporized. Preferably, this overpressure is reached in less than 2 seconds after application of the pressure, when the watering phenomenon is most significant.
  • the parts thus molded had very little blowing and no carbon encrustation, which shows the effectiveness of the improvement according to the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mold Materials And Core Materials (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Casting Devices For Molds (AREA)
  • Pens And Brushes (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Powder Metallurgy (AREA)
  • Manufacture And Refinement Of Metals (AREA)
EP89420215A 1989-03-07 1989-06-13 Procédé de moulage à mousse perdue et sous pression de pièces métalliques Expired - Lifetime EP0386384B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89420215T ATE81044T1 (de) 1989-03-07 1989-06-13 Verfahren zum vollformgiessen von metallischen gegenstaenden unter druck.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR898903706A FR2644087B2 (fr) 1986-11-17 1989-03-07 Perfectionnement au procede de moulage a mousse perdue de pieces metalliques
FR8903706 1989-03-07

Publications (2)

Publication Number Publication Date
EP0386384A1 EP0386384A1 (fr) 1990-09-12
EP0386384B1 true EP0386384B1 (fr) 1992-09-30

Family

ID=9379922

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89420215A Expired - Lifetime EP0386384B1 (fr) 1989-03-07 1989-06-13 Procédé de moulage à mousse perdue et sous pression de pièces métalliques

Country Status (19)

Country Link
EP (1) EP0386384B1 (ru)
JP (1) JPH0626748B2 (ru)
KR (1) KR920003686B1 (ru)
AR (1) AR241761A1 (ru)
AT (1) ATE81044T1 (ru)
AU (1) AU600413B2 (ru)
BR (1) BR8903257A (ru)
CA (1) CA1335689C (ru)
DE (1) DE68903103T2 (ru)
DK (1) DK320189A (ru)
ES (1) ES2034726T3 (ru)
FI (1) FI93322C (ru)
GR (1) GR3005937T3 (ru)
IE (1) IE63394B1 (ru)
MX (1) MX172962B (ru)
NO (1) NO172968C (ru)
PT (1) PT91078B (ru)
RU (1) RU1836177C (ru)
UA (1) UA13214A (ru)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2651453B2 (fr) * 1989-09-07 1994-03-25 Pechiney Aluminium Perfectionnement au procede de moulage a mousse perdue et sous pression de pieces metalliques.
US5301739A (en) * 1992-06-30 1994-04-12 Cook Arnold J Method for casting and densification
US6640877B2 (en) * 1998-05-14 2003-11-04 Howmet Research Corporation Investment casting with improved melt filling
RU2312738C1 (ru) * 2006-02-09 2007-12-20 Открытое акционерное общество "Новосибирский завод химконцентратов" Способ литья по выплавляемым моделям с кристаллизацией под давлением и устройство для его осуществления
CN103556011B (zh) * 2013-11-22 2015-10-21 山东蒙沃变速器有限公司 一种消失模铸造铝合金材料及其制备方法

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
FR2559407B1 (fr) * 1984-02-15 1986-09-05 Pont A Mousson Procede de moulage en fonderie et moule pour la coulee de precision sous basse pression, avec modele gazeifiable et moule en sable sans liant
GB2159445B (en) * 1984-06-02 1988-07-06 Cosworth Res & Dev Ltd Casting of metal articles
DE3760303D1 (en) * 1986-04-11 1989-08-17 Alusuisse Process and plant for pressure casting
FR2606688B1 (fr) * 1986-11-17 1989-09-08 Pechiney Aluminium Procede de moulage a mousse perdue de pieces metalliques
US4724889A (en) * 1987-04-27 1988-02-16 Ford Motor Company Degating technique for clustered castings made by ECP

Also Published As

Publication number Publication date
RU1836177C (ru) 1993-08-23
PT91078B (pt) 1995-07-03
DK320189D0 (da) 1989-06-28
KR900014059A (ko) 1990-10-22
FI893154A (fi) 1990-09-08
AU3780489A (en) 1989-10-19
IE63394B1 (en) 1995-04-19
DK320189A (da) 1990-09-08
DE68903103T2 (de) 1993-04-15
NO172968B (no) 1993-06-28
PT91078A (pt) 1990-11-07
GR3005937T3 (ru) 1993-06-07
AR241761A1 (es) 1992-12-30
UA13214A (ru) 1997-02-28
NO892666D0 (no) 1989-06-27
MX172962B (es) 1994-01-26
NO892666L (no) 1990-09-10
ATE81044T1 (de) 1992-10-15
JPH02235546A (ja) 1990-09-18
ES2034726T3 (es) 1993-04-01
EP0386384A1 (fr) 1990-09-12
FI893154A0 (fi) 1989-06-28
DE68903103D1 (de) 1992-11-05
JPH0626748B2 (ja) 1994-04-13
KR920003686B1 (ko) 1992-05-09
FI93322B (fi) 1994-12-15
IE892097L (en) 1990-09-07
NO172968C (no) 1993-10-06
CA1335689C (fr) 1995-05-30
AU600413B2 (en) 1990-08-09
BR8903257A (pt) 1990-09-25
FI93322C (fi) 1995-03-27

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BE562237A (ru)

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