Title:
GYPSUM MOLD FOR VACUUM CASTING
Document Type and Number:
Japanese Patent JPS6056439
Kind Code:
A
Abstract:
PURPOSE: To obtain good run and a defectless product without casting defects by providing a filter made of a refractory material having better air permeability than gypsum from the part near the final filling part of the molten metal in the product cavity to the outside surface of a gypsum mold for casting.
CONSTITUTION: A filter 5 formed of a refractory material is directly communicated with and provided to the neighborhood of the part in a product cavity 3 where a molten metal is finally filled. The filter 5 is required to have better air permeability than gypsum and is formed preferably of a refractory material. A sand mold or porous zirconia sintered body or the like is usable as the filter 5 meeting such requirements.
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Inventors:
MORITA AKIYOSHI
HAYASAKA TAMIO
SATOU MITSUYOSHI
IKEDA HIROAKI
HAYASAKA TAMIO
SATOU MITSUYOSHI
IKEDA HIROAKI
Application Number:
JP16724683A
Publication Date:
April 02, 1985
Filing Date:
September 09, 1983
Export Citation:
Assignee:
TOYOTA MOTOR CO LTD
International Classes:
B22D18/06; B22C1/08; B22C9/02; B22C9/08; (IPC1-7): B22C1/00; B22C9/02; B22D18/06
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