Apparatus for molding cast iron parts containing spheroidal graphite

Abstract

Apparatus for molding, by inoculation, cast iron parts requiring a spheroidal graphite texture, includes a mold containing the impression of the item to be cast and a treatment chamber, situated within the inlet channel of the mold, which opens into the impression of the part. The chamber contains the necessary inoculant for the casting of parts, and the volume of the chamber is equal to the sum of the volumes of the part being cast and the deadhead. The chamber is closed off from the impression portion of the mold by means of a temporary plug which is capable of being destroyed by means of the combined action of the temperature and pressure of the molten metal, the inoculation being performed within this chamber during the time necessary for the destruction of the temporary plug. Further, a separator disk of neutral refractory material, having a cavity containing a substance for completing the action of the inoculant, is placed immediately downstream of the temporary destructible plug within the inlet to the impression portion of the mold. The apparatus is particularly adapted for the production of rather large cast iron parts with spheroidal graphite, such as for example, the crankshafts of internal combustion engines.

Dependencies are inferred from the claim text.