| 摘要 |
PURPOSE:To abolish an operation for breaking a runner by providing a plate- shaped body having a circular through-hole and a spherical body having the diameter larger than the diameter of said through-hole into the runner cavity. CONSTITUTION:A lower casting mold 6 is formed and a heat resistant spherical body 5 is loaded in the bottom of a runner cavity 2. A heat resistant plate- shaped body 4 having a through-hole 3 is installed across the part 2 of a parting plane 1. A cope 7 is put thereon. When a molten metal is poured through a sprue 8, the molten metal is filled in the cavity through the through-hole 3 of the body 4. The body 5 is floated by buoyancy to contact with the hole 3 and to shut off the upper and lower runners upon stopping of pouring after the molten metal is filled therein. The long runner is thus parted to an optional length in the stage of rapping and therefore the need for the operation for breaking the runner is eliminated, by which the safety is improved and the cost is reduced. |
