WO2002078877A1 - Procede de traitement de moules en materiau refractaire ou carapaces destines au moulage a modeles perdus de pieces de fonderie en particulier en alliages d'aluminium - Google Patents

Procede de traitement de moules en materiau refractaire ou carapaces destines au moulage a modeles perdus de pieces de fonderie en particulier en alliages d'aluminium Download PDF

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Publication number
WO2002078877A1
WO2002078877A1 PCT/FR2002/000612 FR0200612W WO02078877A1 WO 2002078877 A1 WO2002078877 A1 WO 2002078877A1 FR 0200612 W FR0200612 W FR 0200612W WO 02078877 A1 WO02078877 A1 WO 02078877A1
Authority
WO
WIPO (PCT)
Prior art keywords
shell
refractory material
fluidized bed
metal
metallic material
Prior art date
Application number
PCT/FR2002/000612
Other languages
English (en)
French (fr)
Inventor
Philippe Tedesco
Original Assignee
Microcast
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 Microcast filed Critical Microcast
Priority to DE60219608T priority Critical patent/DE60219608D1/de
Priority to EP02706870A priority patent/EP1372887B1/de
Publication of WO2002078877A1 publication Critical patent/WO2002078877A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/12—Treating moulds or cores, e.g. drying, hardening
    • 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

Definitions

  • the present invention relates to a process for treating molds made of refractory material or shells intended for molding lost patterns of foundry parts, in particular aluminum alloys, with the aim of increasing the rate of solidification of these foundry parts.
  • the metal casting step is implemented in molds of refractory material called shells based on alumina silicate, sand, zircon, silica, ceramic or plaster which are manufactured in a preliminary stage.
  • the refractory material in the form of a refractory liquid slip is applied in layers around a model immersed in a tank stirred mechanically by means of a dusting machine or in a fluidized bed.
  • Foundry molds with lost models in shells generally have between 6 and 9 successive layers of refractory material in the case of light alloy foundries.
  • the model thus leaves its place in the shell in an imprint, in which the alloy can be cast by gravity, by low pressure casting or by suction, this in the open air, under vacuum or under controlled atmosphere.
  • the foundry piece thus molded is unchecked, that is to say it leaves the shell in which it was cast. then subjected to conventional finishing and heat treatment operations.
  • the lost-model molding process has the advantage of making it possible to obtain very thin casting parts having a complex geometry.
  • the object of the present invention is to remedy these drawbacks by proposing a process for the treatment of shells intended for molding lost patterns of foundry parts, in particular of aluminum alloy, making it possible to increase the cooling speed of these parts after the casting step.
  • this method is characterized in that, before and / or simultaneously with the casting step, a metallic material is applied to the outer layer of the shell in the form of small particles. These metallic particles come intimately into contact with the refractory material constituting the shell so as to form a composite shell of refractory material / metal which is much more compact. conductive of heat than the base shell and therefore dissipates calories much faster.
  • At least one layer based on a metallic material preferably in the form of particles, is applied to the outer layer of refractory material while it is not yet solidified. beads with a diameter of the order of 0.1 to 3 mm,
  • the refractory material / metal composite shell thus obtained is subjected to a firing step at a maximum temperature of 600 to 800 ° C., and - the metal, in particular the aluminum alloy constituting the part, is poured into this shell of foundry to be molded.
  • foundry molds with lost models in shells generally comprise several successive layers of refractory material.
  • This first variant of the invention therefore consists in replacing the last layer or the last two, three or four layers of refractory material of the shell with one or more layers based on metallic particles.
  • These layers can advantageously be applied by a method similar to the conventional method of applying the liquid refractory slip by using a dusting machine or in a fluidized bed tank, so that the metallic particles are adhered to the layer of external liquid slip just installed.
  • the shell is made of refractory material in a manner known per se,
  • this shell is subjected to a cooking step at a maximum temperature of 600 to 1100 ° C,
  • the metal in particular the aluminum alloy constituting the casting part to be molded, is poured into the shell thus positioned in the fluidized bed tank, and
  • the shell is kept in the fluidized bed tank until the casting is cooled.
  • the metallic particles which are in particular of aluminum, cast iron, steel or copper, come to stick to the refractory material of the shell by matching its external shape, and can thus perfectly fulfill their cooling function thereof. this.
  • the shell in the fluidized bed tank after immersion of the shell in the fluidized bed tank, it is subjected to a magnetic field so as to improve the adhesion of the metal particles on the shell of refractory material.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mold Materials And Core Materials (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
PCT/FR2002/000612 2001-04-02 2002-02-18 Procede de traitement de moules en materiau refractaire ou carapaces destines au moulage a modeles perdus de pieces de fonderie en particulier en alliages d'aluminium WO2002078877A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE60219608T DE60219608D1 (de) 2001-04-02 2002-02-18 Verfahren zur behandlung von feuerfesten giessformen oder schalenformen beim vollformgiessen , insbesondere für aluminiumlegierungen
EP02706870A EP1372887B1 (de) 2001-04-02 2002-02-18 Verfahren zur behandlung von feuerfesten giessformen oder schalenformen beim vollformgiessen , insbesondere für aluminiumlegierungen

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR01/04444 2001-04-02
FR0104444A FR2822737B1 (fr) 2001-04-02 2001-04-02 Procede de traitement de moules en materiau refractaire ou carapaces destines au moulage a modeles perdus de pieces de fonderie en particulier en alliages d'aluminium

Publications (1)

Publication Number Publication Date
WO2002078877A1 true WO2002078877A1 (fr) 2002-10-10

Family

ID=8861833

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FR2002/000612 WO2002078877A1 (fr) 2001-04-02 2002-02-18 Procede de traitement de moules en materiau refractaire ou carapaces destines au moulage a modeles perdus de pieces de fonderie en particulier en alliages d'aluminium

Country Status (5)

Country Link
EP (1) EP1372887B1 (de)
AT (1) ATE359883T1 (de)
DE (1) DE60219608D1 (de)
FR (1) FR2822737B1 (de)
WO (1) WO2002078877A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2896711B1 (fr) * 2006-01-31 2008-07-25 Marc Lebreton Nouveau procede de moulage.
CN114147178B (zh) * 2021-12-15 2022-10-11 广州市荣泽模具有限公司 一种铝合金消失模铸造方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB746091A (en) * 1954-01-15 1956-03-07 Shell Cast Alloys Ltd Backing shell moulds in mould boxes
US2806270A (en) * 1953-07-17 1957-09-17 Rolls Royce Method of making moulds for precision casting
US2985929A (en) * 1959-12-18 1961-05-30 Richard T Carter Method and apparatus for support and cooling of shell molds
US3474851A (en) * 1966-01-17 1969-10-28 Monsanto Chemicals Processes for casting molten metal in active carbon coated ceramic shell moulds
DE1806277A1 (de) * 1968-10-31 1970-05-06 Bbc Brown Boveri & Cie Verfahren und Vorrichtung zum Abstuetzen von Formmasken

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2806270A (en) * 1953-07-17 1957-09-17 Rolls Royce Method of making moulds for precision casting
GB746091A (en) * 1954-01-15 1956-03-07 Shell Cast Alloys Ltd Backing shell moulds in mould boxes
US2985929A (en) * 1959-12-18 1961-05-30 Richard T Carter Method and apparatus for support and cooling of shell molds
US3474851A (en) * 1966-01-17 1969-10-28 Monsanto Chemicals Processes for casting molten metal in active carbon coated ceramic shell moulds
DE1806277A1 (de) * 1968-10-31 1970-05-06 Bbc Brown Boveri & Cie Verfahren und Vorrichtung zum Abstuetzen von Formmasken

Also Published As

Publication number Publication date
FR2822737A1 (fr) 2002-10-04
ATE359883T1 (de) 2007-05-15
FR2822737B1 (fr) 2003-08-01
EP1372887B1 (de) 2007-04-18
DE60219608D1 (de) 2007-05-31
EP1372887A1 (de) 2004-01-02

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