process for casting and shell of hollow cylindrical cast iron castings with thin wall.

摘要

917,990. Moulds. MEZ MOHELNICE, NARODNI PODNIK. Feb. 3, 1961 [Feb. 6, 1960], No. 4238/61. Class 83 (1). Thin-walled cylinders of gray cast iron are cast in metal moulds with metal cores. The metal enters the mould cavity 15 through an annular channel 13 communicating with the cavity via inlet channels 14 or a circumferential inlet. 16 is a circumferential air venting gap and 5 a coolant jacket. The upper and lower core parts 6, 3 are each carried by an hydraulic piston for insertion and removal, and one of said pistons may serve to press out the finished casting from the mould.