METHOD FOR MOLDING GREEN SAND CORE

PURPOSE:To enable molding of a core having the prescribed strength by pressing a sticking rod into green sand packed in a cavity in a pattern for molding the core, pulling out, inserting a hollow body in a space part formed, pouring fluid and compressing the green sand. CONSTITUTION:The green sand 56 is packed into the cavity 54 from a blowing hole 55 by blowing. Then, the sticking rod is inserted into the green sand 56 and temporarily compressed and pulled out to form the space part 57. Successively, the hollow body 61 formed with elastic material and a rear end are connected with a pressurized device 70 and a pipe 64 fitting to a blowing hole 55 near the front end part 62 is prepared and the front end part 62 is inserted into the inner space 65 in the hollow body 61, to make the closed state. At the time of pouring the fluid into inner space 65 by working the pressurized device 70, the green sand 56 packed in the cavity 54 is pressed and compressed. By opening a cope 51 and a drag 52, the core is taken out from the mold.