Method of molding articles to minimize shrinkage and voids

B - Operations – Transporting – 22 – C

Patent

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Details

B22C 15/00 (2006.01) B22C 19/00 (2006.01) B22D 17/12 (2006.01) B22D 17/30 (2006.01) B22D 39/02 (2006.01)

Patent

CA 2174302

A method for molding is disclosed which includes the steps of elevating molten material into a mold cavity and subsequently bringing pressure to bear on the molten material in the mold cavity substantially immediately to solidify the molten material under pressure. The method further includes the steps of tapping the molten material from a reservoir of molten material below the surface of the molten material to minimize exposure to air of the molten material and transferring the tapped molten material to the mold cavity without a downward flow or a pouring of the tapped molten material. An apparatus is disclosed which pushes or elevates the molten material into the mold cavity. The apparatus further includes a reservoir and a shuttle for transferring molten material from the reservoir. The shuttle and reservoir assembly permits molten material to be elevated upwardly into the shuttle from the beneath the surface of the molten material to minimize or eliminate pouring and thus turbulence and pores in the final product. The final product is free of cracks and laminations, and is smooth and nonporous.

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