Sand core

Abstract

Abstract PURPOSE:To provide a sand core which assures substantial ventability and improves strength by reinforcing the inside of the core molded to a prescribed shape by using green sand with a mandrel of a hollow shape provided with a suitable number of fine holes. CONSTITUTION:This core 1 is molded of green sand 2 and the inside thereof is reinforced by a mandrel 3. The core is approximately cylindrical and the mandrel 3 is made into the cylindrical shape having a pointed tip. Many fine holes 4 for venting are punched to the mandrel 3. The molding of the core 1 is accomplished by inserting the mandrel 3 onto a bar member 9, opening a shutter between a core box 6 and a green sand feed port 7 and feeding the green sand 2 into the box 6. The shutter is then closed and a lower shutter is opened to advance the member 9 into the box 6 to compress the green sand 2 by about 30% thereby molding the core 1. The member 9 is drawn while the mandrel 3 is left in the box 6 and thereafter the core 1 is removed from the box 6.

Inventors

• 👤 Tadataka Kaneko
• 👤 金子　忠孝
• 👤 Koji Kato
• 👤 加藤　幸二
• 👤 Tetsuo Haraga
• 👤 原賀　哲男

Bibliographic Details