B - Operations – Transporting – 22 – D
Patent
B - Operations, Transporting
22
D
22/166, 22/49
B22D 23/00 (2006.01) B22D 1/00 (2006.01) B22D 35/00 (2006.01) B22D 45/00 (2006.01)
Patent
CA 1076319
ABSTRACT OF THE DISCLOSURE A method and apparatus for making metal castings and particularly nodular iron castings. The castings are made in molds, each having a chamber in the upper portions of the mold, the chamber being connected by gating passages to the casting cavities. In the manufacture of nodular iron castings, a nodu- larizing agent as placed in the chamber. The chamber is open at the top and the molten metal flows from the chamber into the gating passages of the mold through openings that are disposed above the floor of the chamber. During the pouring operation the upper surface of the mold, including the open top of the chamber, is closed by a refractory sealing member having a pas- sage through which the molten metal can flow. This passage is connected to a launder or the like to which molten metal is sup- plied by a furnace. At the end of the launder there is a ver- tical conduit that extends downwardly and provides a closed conduit for the vertical flow of metal from the launder through the refractory sealing member into the chamber. The molten metal is supplied to the launder from the furnace at a rate faster than the rate at which the metal flows out of the cham- ber into the gating passages. Thus, during the pouring opera- tion, a head metal is formed extending from the launder through the conduit and the seal and into the chamber, all of which may be filled with molten metal for a short period of time during the pouring process. The molds are moved step-by-step succes- sively along a pouring rail, past a station where a nodularizing agent is placed into the chamber, if nodular iron is being pro- duced, and another station where molten metal is automatically poured into the chamber through the refractory seal member that is positioned in contact with the top of the mold when the mold is stopped at the pouring station and then after pouring is completed is removed from contact with the mold to permit the mold to be advanced and another mold positioned at the pouring station.
280698
Frost James
Mather David S.
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