Toyota Jidosha Kabushiki Kaisha

Daisuke Yamashita

Hirotsune Watanabe

Masashi Morikawa

A method of reusing core sand includes crushing a core used for casting into granules, the core includes water glass as a binder, and the water glass includes water-soluble water glass and water-insoluble water glass; heating the core; detaching the water glass from the core sand; and separating and collecting the core sand from a mixture of the water glass and the core sand.

Method of reusing core sand

A method of reusing core sand includes crushing a core used for casting into granules; heating the granules at a temperature of 300&#xb0; C. to 550&#xb0; C.; causing the heated granules to collide against each other such that water glass used as a binder detaches from the core sand; and blowing air into a mixture of the water glass and the core sand, which are detached from each other, such that the core sand is separated and collected from the mixture due to a difference in specific gravity between the water glass and the core sand.

A method of reusing core sand includes: crushing a core used for casting into granules; heating the granules at a temperature of 300&#xb0; C. to 550&#xb0; C.; causing the heated granules to collide against each other such that water glass used as a binder detaches from the core sand; and blowing air into a mixture of the water glass and the core sand, which are detached from each other, such that the core sand is separated and collected from the mixture due to a difference in specific gravity between the water glass and the core sand.

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Daisuke Yamashita