| 摘要 |
PURPOSE:To permit easy discharging of sand for cores from a casting in the stage of using sand mold cores in casting an Al alloy by embedding core print parts by casting and subjecting the casting to a heat treatment then cutting the core prints. CONSTITUTION:Cores 11, 12 molded of molding sand in the casting cavity 7 formed of a bottom mold 3, a top mold 4, a left mold 5 and a right mold 6 are attached in the hollow recesses 15, 16, 17, 18 of the molds 5, 6 and the mold 3 by core prints 13a, 13b, 14a, 14b apart therefrom at a clearance S. The melt of an Al alloy is forced from a sleeve 9 by a plunger 10 into the cavity and is cast. The core prints 13a, 13b, 14a, 14b are embedded by casting with the molten Al alloy intruding into the clearance S. Even if the casting removed by knocking out the top, bottom, right and left molds is hardened immediately as it is in water, the entry of the water into the cores is prevented by the parts embedded by casting. The core prints are removed by cutting after the hardening treatment and thereafter the casting is oscillated to collapse the sand of the cores 11, 12, by which the sand is easily removed from the casting. |
