Sintokogio, Ltd.

Yasunori Yoshida

Kazuo Sugimoto

Ryoji Kanayama

Kuniyasu Mori

Hisashi Harada

Hiroyasu Makino

Takehiko Matsumoto

Shigeaki Yamamoto

Hiroaki Tokita

Yukikazu Ando

A method and apparatus are provided to process collected sand. This method and apparatus allow the moisture content to be adjusted and the addition of a binder to be facilitated to renew the collected sand as casting sand for future use. Also, defective castings are prevented when they are made by a main mold using the renewed casting sand. The sand-collecting means can be compact. The method is performed and the apparatus is operated by separating a main mold of green sand, after casting is conducted, into parts unaffected and affected by the molten metal heat, adjusting the moisture content of the part unaffected by molten metal heat for use as facing sand in the next main mold making, and adding a binder and adjusting the moisture content of the part affected by the molten metal heat for use as back sand in making the next main mold.

Collected sand processing method

Given green sand is obtained by a mixing operation that is carried out for a short period of time. Discarded sand is supplied as supplementary sand to a sand processing line, so that molding sand can be recycled. Green sand for a molding is used for facing sand or the pocket sand. Bentonite-covered sand is made by mixing reproduced sand, new sand, and discarded sand or any or all of them. The bentonite-covered sand is added to collected sand to supplement it. Also, the bentonite-covered sand is mixed with water, and used for facing sand or the pocket sand.

Method for making sand covered with bentonite, the sand, and a method for recycling molding sand for a mold using the sand covered by bentonite

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Toyokawa, Japan

Yasunori Yoshida