METHODS OF CLOSING THE INLET IN A MOULD AFTER NON-GRAVITY CASTING WITH A NON-FERROUS ALLOY OF GREEN-SAND MOULDS IN A MOULD-STRING PLANT.

摘要

In a method of closing the inlet (8) in a mould, a cylindrical element (14) with a through-going passage (15) is retained in the mould in such a manner that a part of the element (14) protrudes from the outside of the mould, and so that the passage (15) opens into a part of the runner (8) of the mould, the internal terminal surface of the element (14) lying opposite a plane surface (16) in the runner (8). During casting, the nozzle (13) of a casting device is brought into tight-fitting abutment against the outer end of the element, and the molten metal alloy is cast into the mould through the nozzle (13), the passage (15) in the element (14) and the runner (8) of the mould (Figure a). After casting of the mould, the nozzle (13) is pressed against the element (14) with a considerably greater force than its abutting force during casting, thus causing the element to be displaced axially into the mould to form a tight-fitting abutment against the surface (16) in the runner (8) and blocking the latter, enabling the nozzle (13) to be withdrawn without cast metal flowing out from the mould (Figure b). Three other methods of closing an inlet are described.