Molding medium, method for making same and evaporative pattern c

Details Molding medium, method for making same and evaporative pattern c Molding medium, method for making same and evaporative pattern c

1986-07-08

1991-05-07

Seidel, Richard K.

Metal founding

Process

Shaping a forming surface

164 34, 164520, 106 383, 106 389, B22C 904

Patent

active

050128574

ABSTRACT:
A molding medium and process for making it, preferably for use in the evaporative pattern casting process, is disclosed. The molding medium comprises, in one embodiment, a base granular molding material having spherically shaped grains wherein the individual grains of the material are coated with a refractory material. Preferably the grains are coated first with a binding agent and then mixed with a refractory material, which may be zirconium oxide. After coating, the material is fired at a high temperature, crushed and screened to size, according to one method. Alternatively, the base molding material may itself be a refractory material, in which case the refractory material is mixed with a binding agent to agglomerate the base material into substantially spherical particles and a refractory coating need not be applied. In either embodiment, substantially spherical free-flowing particles are produced having a low angle of repose. This allows the molding medium to come into close contact with the pattern of the object to be cast. Furthermore, the use of a refractory coating for the particles of the molding medium or a refractory material for the molding medium itself eliminates the need for a refractory wash or coating on the pattern.

REFERENCES:
patent: 3069292 (1962-12-01), Alexander et al.
patent: 3934637 (1976-01-01), Potier
patent: 4010791 (1977-03-01), Hetke et al.
patent: 4243420 (1981-01-01), Sakai et al.
patent: 4491482 (1985-01-01), Hori

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