METHOD FOR MOLDING GREEN SAND CORE

PURPOSE:To manufacture a green sand core having the specific strength by forming a penetrating hole, pressing after provisionally combining plural green sand cores previously molded, respectively and combined-integrating both. CONSTITUTION:The green sand 81 is previously molded to the upper and lower dies having penetrating holes respectively and this is pressed with a pressing die 92 and first and second cores corresponding to hemispheres 102, 103 are previously molded. Successively, the upper and lower molds 401, 42 are piled up and the green sand 81 is blown through first and second penetrating holes 201, 301 and after provisionally combining the first and second cores 202, 302, the green sand 81 is compressed with the upper and lower pressing dies 610, 620 to manufacture the core 700. By this method, the green sand core having the specific strength is manufactured.