| 摘要 |
When employing an under-blow scheme for blowing core sand into a core box located on the upper side, a core sand filling method which can favorably fill the core box with core sand, thereby contributing to improving the efficiency in manufacturing cores, is provided. The core sand filling method comprises a step of operating an aeration air supply means 9A, so as to float and fluidize core sand within a sand blow chamber 4 and, when a pressure Pf of the sand blow chamber 4 measured by the first pressure sensor 14 reaches a first pressure P1, operating a compressed air supply means 7A and a step of stopping the aeration air supply means 9A and compressed air supply means 7A from operating when each of the pressure Pf within the sand blow chamber 4 and a pressure Pc within a sand storage chamber 5 is a second pressure P2 or higher while a differential pressure ”P = Pc - Pf is a third pressure P3 or lower. |
