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.
Apparatus for casting iron parts requiring spheroidal graphite texture comprising: a mold having a pouring channel and containing an impression of the part to be cast; a treatment chamber disposed within the pouring channel of said mold and containing an inoculant required for the casting of said part, the volume of the portion of said treatment chamber leading to said impression of said part being equal to the sum of the volumes of said part being cast and the deadhead of said part; said chamber being closed upon the side thereof facing said casting by means of a plug capable of being destroyed by means of the combined action of the temperature and pressure of the molten metal, said plug having a thickness and composition selected to provide a length of time said plug will resist the temperature and pressure of the molten metal charge so as to enable said volume of the portion of said treatment chamber leading to said impression of said part to be filled with said charge before said plug is destroyed; and a separator disc, of neutral refractory material and including a cavity containing an active substance, disposed downstream of said plug; whereby said inoculation occurs within said chamber during the time necessary for the destruction of said plug.
Claim 2
Dependent Claim
214 words
Apparatus for casting iron parts requiring spheroidal graphite texture comprising: a mold having a pouring channel and containing an impression of the part to be cast; a treatment chamber disposed within the pouring channel of said mold and containing an inoculant required for the casting of said part, the volume of the portion of said treatment chamber leading to said impression of said part being equal to the sum of the volumes of said part being cast and the deadhead of said part; said chamber being closed upon the side thereof facing said casting by means of a plug capable of being destroyed by means of the combined action of the temperature and pressure of the molten metal, said plug having a thickness and composition selected to provide a length of time said plug will resist the temperature and pressure of the molten metal charge so as to enable said volume of the portion of said treatment chamber leading to said impression of said part to be filled with said charge before said plug is destroyed; and a separator disc, of neutral refractory material and including a cavity containing an active substance, disposed downstream of said plug; whereby said inoculation occurs within said chamber during the time necessary for the destruction of said plug.
Claim 3
Dependent Claim
47 words
Apparatus for casting as set forth in claim 1, wherein said chamber has associated therewith a runner and said mold has associated therewith a gate, a trap being interposed between said gate and said runner for preventing the formation of oxides upon the metal within said chamber.
Claim 4
Dependent Claim
25 words
Apparatus for casting as set forth in claim 1, wherein said active substance contained within said cavity of said separator disk is a post-inoculant deoxidizer.