EP0277577B1 - Feingussschalenform für Aluminium bzw. dessen Legierungen - Google Patents

Feingussschalenform für Aluminium bzw. dessen Legierungen Download PDF

Info

Publication number
EP0277577B1
EP0277577B1 EP88101050A EP88101050A EP0277577B1 EP 0277577 B1 EP0277577 B1 EP 0277577B1 EP 88101050 A EP88101050 A EP 88101050A EP 88101050 A EP88101050 A EP 88101050A EP 0277577 B1 EP0277577 B1 EP 0277577B1
Authority
EP
European Patent Office
Prior art keywords
metal
precision
ceramic shell
coating
shell mould
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
EP88101050A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0277577A2 (de
EP0277577A3 (en
Inventor
Heinrich Ballewski
Friedrich Dr. Behr
Wolfgang Grossmann
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.)
Thyssen Guss AG
Original Assignee
Thyssen Guss AG
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 Thyssen Guss AG filed Critical Thyssen Guss AG
Publication of EP0277577A2 publication Critical patent/EP0277577A2/de
Publication of EP0277577A3 publication Critical patent/EP0277577A3/de
Application granted granted Critical
Publication of EP0277577B1 publication Critical patent/EP0277577B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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 an investment casting mold, preferably for hypoeutectic aluminum alloys, in which the rough inner mold wall is coated with a salt mixture with reducing properties, the salt coatings consisting of a salt or salt mixture with a liquidus temperature below the casting temperature, the cations of which predominantly consist of those of the Alkali and / or alkaline earth metals and their anions consist predominantly of those of the halogens.
  • a method for reducing the dendrite arm distances according to the preamble of claim 1 is known (DE-OS 3 512 118), in which the improvement in the technological properties of the castings is obtained by means of a special salt mixture by applying this salt mixture to a particularly rough inner shell of the molded shell becomes what promotes the germination of the dendrites in metal solidification, so that smaller dendrite arm distances are obtained.
  • a large number of germ-active substances are described in the literature.
  • hypoeutectic aluminum alloys e.g. AISi7Mgo.6, then have improved strength values if low-gas and clean melts are used, which is best achieved by casting in a vacuum and / or by flushing gas treatment in a rough vacuum and / or filtering the melt.
  • Vaccination of the melt with the help of e.g. Strontium or antimony to achieve spherical molding of the eutectic silicon also lead to an improvement in the technological values.
  • Metal films can e.g. according to U.S. Patent 3,462,288, U.S. Patent 1,621,227, U.S. Patent 3,639,139, U.S. Patent 3,705,051, U.S. Patent 3,836,385 and U.S. Patent 2,635,798.
  • the present invention is based on the object of reducing the dendrite arm spacing when casting hypereutectic aluminum alloys into preheated ones Investment casting bowl shapes can be set correctly and safely.
  • the metal coating consists of more than 40 atomic% of one or more metals from the series Al, Ti and / or alkaline earth metals and / or alloys, mixtures or metallic compounds .
  • the coating metal optionally in the form of its alloys, mixtures or compounds, is advantageously applied to the inner wall of the mold before, after or simultaneously with the salt coating.
  • the coating metal expediently consists of an aluminum alloy which contains 0 to 10% by weight of magnesium and / or 0 to 6% by weight of silicon and / or 0 to 3000 ppm of yttrium and / or one and / or more rare earths and / or beryllium and / or contains bismuth and / or antimony.
  • the advantage of the invention is not only the fact that considerably smaller dendrite arm distances and thus better technological values of the cast part, in particular in the case of hypoeutectic aluminum alloys, are obtained, but that at the same time a spherical molding of the silicon is obtained. This is particularly important because it can save additional finishing measures.
  • metal films can be applied to the inner wall of the mold using various chemical or physical processes.
  • metal powder and salt or salt mixture in the form of a slurry or solution simultaneously by pouring and pouring them onto the inner shell of the mold.
  • metal powders have a greater tendency to oxidize than metal films when preheating the molded shell, it has proven to be advantageous to use metallic alloys and / or compounds or mixtures in powder form which either only have a particularly low oxidation due to their composition when preheating the molded shell experienced or used metals, the oxide layer is destroyed in the presence of the cast aluminum at casting temperature by an alloy partner.
  • the destruction of the oxide film on the surfaces can be achieved, for example, by using aluminum brazing powder with grain sizes of approx. 10 to 50 11 m.
  • Usual hard solders contain, for example, beryllium with about 50 ppm as a reducing additive, some additionally with magnesium with about 1.5% and also bismuth or antimony with about 10 to 100 ppm.
  • alloys that are easy to grind due to their hardness and are also germ-active. So far, the following metallic compounds, each with an atomic ratio of approximately 1: 1, have proven themselves: FeAI, FeTi, CaAl, CaSi, TiNi, TiAg.
  • the inside of an investment casting shell is coated by pouring in and pouring out and then drying with a slurry consisting of 40 g NaCl, 20 g NaF, 20 g LiCl, 5 g Na 4 Fe (CN) 6 and 20 g metal in 1 liter water .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mold Materials And Core Materials (AREA)
  • Powder Metallurgy (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
EP88101050A 1987-02-05 1988-01-26 Feingussschalenform für Aluminium bzw. dessen Legierungen Expired - Lifetime EP0277577B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3703416A DE3703416A1 (de) 1987-02-05 1987-02-05 Feingussschalenform fuer aluminium bzw. dessen legierungen
DE3703416 1987-02-05

Publications (3)

Publication Number Publication Date
EP0277577A2 EP0277577A2 (de) 1988-08-10
EP0277577A3 EP0277577A3 (en) 1988-11-30
EP0277577B1 true EP0277577B1 (de) 1990-10-31

Family

ID=6320251

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88101050A Expired - Lifetime EP0277577B1 (de) 1987-02-05 1988-01-26 Feingussschalenform für Aluminium bzw. dessen Legierungen

Country Status (9)

Country Link
EP (1) EP0277577B1 (sv)
JP (1) JPS63268534A (sv)
BR (1) BR8800436A (sv)
CS (1) CS71088A3 (sv)
DE (2) DE3703416A1 (sv)
ES (1) ES2018857B3 (sv)
IL (1) IL85274A (sv)
RU (1) RU1839646C (sv)
ZA (1) ZA88617B (sv)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19929290A1 (de) * 1999-06-25 2000-12-28 Volkswagen Ag Verfahren zur Herstellung von magnesiumhaltigen Metallgußteilen
GB2421207A (en) * 2004-12-16 2006-06-21 Cosworth Technology Ltd Casting with a halogen containing compound provided on the mould surface

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3019497A (en) * 1958-11-21 1962-02-06 Howe Sound Co Making fine grained castings
US3476171A (en) * 1967-02-14 1969-11-04 Reactive Metals Inc Method for melting refractory metal
DE3512118A1 (de) * 1985-04-03 1986-10-16 Thyssen Industrie Ag, 4300 Essen Verfahren zur erzeugung einer verbesserten feinkoernigkeit des primaergefueges und/oder des eutektikums von gussteilen

Also Published As

Publication number Publication date
ZA88617B (en) 1988-08-02
IL85274A0 (en) 1988-07-31
DE3860894D1 (de) 1990-12-06
EP0277577A2 (de) 1988-08-10
IL85274A (en) 1992-01-15
BR8800436A (pt) 1988-09-20
CS71088A3 (en) 1992-08-12
DE3703416C2 (sv) 1992-01-16
EP0277577A3 (en) 1988-11-30
JPS63268534A (ja) 1988-11-07
DE3703416A1 (de) 1988-08-18
RU1839646C (ru) 1993-12-30
ES2018857B3 (es) 1991-05-16

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