Green sand mold and its production method, and production method of iron-based casting
AssigneeHitachi Metals, Ltd.
InventorKentaro Fukumoto
Life of this patent
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Abstract
A green sand mold comprising at least one pair of green sand mold parts each comprising a recess and a mating surface, wherein a cured layer comprising a thermosetting resin as a main component is formed on the recess and mating surface of each green sand mold part, and wherein the cured layer has hardness of 40-98, a thickness of 0.5-6 mm, and gas permeability of 70-150, is produced by applying a curing material comprising the thermosetting resin as a main component and having viscosity of 1-100 mPa·S to the recess and mating surface of each green sand mold part, combining the green sand mold parts, and then heat-hardening the curing material.
Claims10
A method for producing a green sand mold comprising at least one pair of green sand mold parts each comprising a recess and a mating surface, a cured layer comprising a heat hardened thermosetting resin as a main component being formed on the whole of the recess and mating surface of each of the green sand mold parts;
- and said cured layer having hardness of 40-98 measured by a self-hardening hardness meter NK-009, available from Nakayama Co., Ltd., a thickness of 0.5-6 mm, and gas permeability measured by a rapid method described in Annex 3 of JIS Z 2601 of 70-150, comprising the steps of
- applying a curing material consisting of a thermosetting resin and alcohol and having viscosity of 1-100 mPa·S to a recess and a mating surface of each of the green sand mold parts;
- combining the green sand mold parts;
- and then
- heat-hardening the curing material at a temperature of 80-180° C.
Dependencies are inferred from the claim text.