Sintokogio, Ltd.

Osamu Motomatsu

Hisashi Harada

Kimikazu Kaneto

Nagato Uzaki

Kunihiro Hashimoto

Isao Atsumi

A method of producing a mold core from green sand, wherein green sand is blown into a mold cavity which is sized to be greater than the size of the mold core to be obtained, so that a preformed mold body is prepared. The preformed mold body is then compacted by a compacting die having a cavity recess which is sized in conformity with the size of the mold core to be obtained, until the preformed mold body size is reduced to the final stage. In consequence, the green sand is compacted to develop uniform distributions of strength and hardness over the entire portion of the mold core as the product.

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Aichi, Japan

Osamu Motomatsu