EP0058180B1 - Verfahren zum Abschrecken von in schalenförmigen Sandformen vergossenen Metallgussstücken, dessen Anwendung und eine Vorrichtung zur Durchführung des Verfahrens - Google Patents

Verfahren zum Abschrecken von in schalenförmigen Sandformen vergossenen Metallgussstücken, dessen Anwendung und eine Vorrichtung zur Durchführung des Verfahrens Download PDF

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Publication number
EP0058180B1
EP0058180B1 EP81902308A EP81902308A EP0058180B1 EP 0058180 B1 EP0058180 B1 EP 0058180B1 EP 81902308 A EP81902308 A EP 81902308A EP 81902308 A EP81902308 A EP 81902308A EP 0058180 B1 EP0058180 B1 EP 0058180B1
Authority
EP
European Patent Office
Prior art keywords
sand
process according
quenching
quenched
casting
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
Application number
EP81902308A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0058180A1 (de
Inventor
Anton Alt
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.)
Georg Fischer AG
Original Assignee
Georg Fischer 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 Georg Fischer AG filed Critical Georg Fischer AG
Priority to AT81902308T priority Critical patent/ATE9879T1/de
Publication of EP0058180A1 publication Critical patent/EP0058180A1/de
Application granted granted Critical
Publication of EP0058180B1 publication Critical patent/EP0058180B1/de
Expired 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
    • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould

Definitions

  • the invention relates to a method for quenching metal castings cast in shell-shaped sand molds solidified by a chemical binder, the use of this method, and a device suitable for carrying out the method.
  • a method of the type mentioned has become known as a so-called hard casting process (FR-A-1 039893), in which a hard edge shell is produced on the casting by the direct cooling of the surface of the casting through the sand.
  • the castings are quenched through the sand in a shock-like manner, with the cooling medium making direct contact with the casting.
  • This method is not suitable for producing a fine-grained structure.
  • the additional volume resulting from the graphite precipitation should be used in an inward-facing manner to compensate for the solidification volume deficit.
  • this is achieved in that the sand shells are made water-repellent before or after assembly and the sand mold filled with liquid metal is quenched from the outside during or shortly after the filling process by a liquid or gaseous medium.
  • the quenching of the castings according to the invention also brings about a significant improvement in the mechanical properties.
  • the method according to the invention gives strength values of 190 N / mm 2 at 2% elongation in the as-cast state, and even strength values of 210 N / mm 2 at about 2.5% elongation after cold aging.
  • the method according to the invention offers cost advantages over die casting, since the expensive die casting molds are eliminated.
  • the good, die-cast-like, mechanical properties of the castings produced by the process according to the invention are due to the fact that, on the one hand, a rapid-release heat dissipation produces a fine-grained structure, and on the other hand, after cooling, the mixed crystal enriched with alloy additives, depending on the cooling rate, is similar to the die-casting process partly remains in the supersaturated state and thus has a certain hardening ability.
  • the sand bowls can be made according to the prior art, e.g. B. by adding a binder to the sand that hardens.
  • One such process is the croning process, in which the sand is bound by phenolic resins.
  • the wall thickness of the shells is preferably at least 3 mm.
  • the sand bowls are completed as usual to the mold, the impregnation z. B. with silicone before assembly, but preferably only after assembly, to avoid untreated areas on the contact surface of the shells.
  • the sand bowls can be sprayed with quenching liquid or vapor in the supported or unsupported state or can be completely immersed in a quenching bath will.
  • Water or steam is preferably used as the quenching agent.
  • the time of adding water depends on the cast metal and the wall thickness of the casting.
  • the mold can already be washed with water during casting.
  • thick-walled parts e.g. B. Crankshafts are added a few seconds after pouring.
  • steel gravel, quartz gravel or quartz sand, as well as other granular masses, or also solid supports, are suitable as support means.
  • the quenching liquid itself can also be used as a proppant.
  • olformaldehyde binder develops 20-30% methane and 25-30% carbon monoxide when heated to the casting temperature, which has considerable dangers for humans.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mold Materials And Core Materials (AREA)
EP81902308A 1980-08-29 1981-08-04 Verfahren zum Abschrecken von in schalenförmigen Sandformen vergossenen Metallgussstücken, dessen Anwendung und eine Vorrichtung zur Durchführung des Verfahrens Expired EP0058180B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81902308T ATE9879T1 (de) 1980-08-29 1981-08-04 Verfahren zum abschrecken von in schalenfoermigen sandformen vergossenen metallgussstuecken, dessen anwendung und eine vorrichtung zur durchfuehrung des verfahrens.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH6513/80A CH650430A5 (de) 1980-08-29 1980-08-29 Verfahren zum giessen von metallen mittels phenolharzgebundenen sandformen.
CH6513/80 1980-08-29

Publications (2)

Publication Number Publication Date
EP0058180A1 EP0058180A1 (de) 1982-08-25
EP0058180B1 true EP0058180B1 (de) 1984-10-17

Family

ID=4310798

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81902308A Expired EP0058180B1 (de) 1980-08-29 1981-08-04 Verfahren zum Abschrecken von in schalenförmigen Sandformen vergossenen Metallgussstücken, dessen Anwendung und eine Vorrichtung zur Durchführung des Verfahrens

Country Status (11)

Country Link
EP (1) EP0058180B1 (it)
JP (1) JPS57501828A (it)
BE (1) BE890139A (it)
BR (1) BR8108968A (it)
CA (1) CA1165967A (it)
CH (1) CH650430A5 (it)
DK (1) DK190882A (it)
FI (1) FI69412C (it)
IT (1) IT1138537B (it)
PT (1) PT73559B (it)
WO (1) WO1982000786A1 (it)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2633206B1 (fr) * 1988-06-24 1990-10-12 Peugeot Moule pour la fabrication d'une piece metallique, utilisation de ce moule et procede de moulage correspondant
FR2680125B1 (fr) * 1991-08-09 1995-02-17 Peugeot Procede et dispositif de moulage en carapace avec coquille rigide refroidie.
DE10357618B4 (de) * 2003-12-10 2008-01-24 Bender, Wilfried, Dr. Verfahren zum Herstellen eines Gussteils aus einer Metallschmelze
FR3034332A1 (fr) * 2015-04-01 2016-10-07 Saint Jean Ind Procede de moulage en carapace sable pour la realisation d'une piece dans le domaine de l'automobile et de l'aeronautique

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE734046C (de) * 1941-05-20 1943-04-07 Heinrich Lanz Ag Verfahren zur Verhuetung des Vordringens der Feuchtigkeit aus dem Fuellsand in die Modellsandschicht bei Gussformen
FR1039893A (fr) * 1950-08-04 1953-10-12 Ford Procédé et appareil pour les traitements thermiques, tels que la trempe des pièces moulées
US2968848A (en) * 1959-01-02 1961-01-24 Richard T Carter Method of casting refractory shells
US2985929A (en) * 1959-12-18 1961-05-30 Richard T Carter Method and apparatus for support and cooling of shell molds
DE1241051B (de) * 1961-08-12 1967-05-24 Deutsche Edelstahlwerke Ag Vorrichtung zum Giessen von metallischen Werkstuecken
FR1351085A (fr) * 1963-03-12 1964-01-31 Moule de fonderie
US3404724A (en) * 1966-02-01 1968-10-08 Amsted Ind Inc Method of casting in a shell molding
US3409069A (en) * 1966-02-01 1968-11-05 Amsted Ind Inc Method of casting steel in a shell mold
JPS5638565Y2 (it) * 1977-08-06 1981-09-09
DE2806995A1 (de) * 1978-02-18 1979-08-30 Avesta Jernverks Ab Verfahren und vorrichtung zum giessen in duennwandigen giessformen

Also Published As

Publication number Publication date
FI823324L (fi) 1982-09-28
CA1165967A (en) 1984-04-24
PT73559B (de) 1983-01-17
EP0058180A1 (de) 1982-08-25
WO1982000786A1 (en) 1982-03-18
FI823324A0 (fi) 1982-09-28
IT1138537B (it) 1986-09-17
JPS57501828A (it) 1982-10-14
BR8108968A (pt) 1983-01-11
FI69412C (fi) 1986-02-10
CH650430A5 (de) 1985-07-31
IT8123692A0 (it) 1981-08-28
FI69412B (fi) 1985-10-31
BE890139A (fr) 1981-12-16
PT73559A (de) 1981-09-01
DK190882A (da) 1982-04-28

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