Core manufacturing method for shell core sand core of large casting

The invention discloses a core manufacturing method for a shell core sand core of a large casting. The core manufacturing method comprises the steps of the double-sided sand-discharging sand core mould manufacturing, sand shooting, solidifying and crusting, the first side sand-discharging, overturning, and the second side sand-discharging. By means of the core manufacturing method for the shell core sand core of the large casting, the shell core sand core of the large casting can be obtained by the double-sided sand-discharging, the weight of the sand core is reduced, the cost of using film-coated sand is saved, the production rhythm of the sand core is improved, and the labor intensity of operators is reduced. 本发明公开了种大型铸件壳芯砂芯的制芯方法，包括双面倒砂砂芯模具制作步骤、射砂步骤、固化结壳步骤、第面倒砂步骤、翻转步骤和第二面倒砂步骤。本发明的大型铸件壳芯砂芯的制芯方法，通过双面倒砂获得大型铸件壳芯砂芯，减轻砂芯重量，节省覆膜砂使用成本，提高砂芯生产节拍，降低操作工劳动强度。