Metal casting using a mold having attached risers

Details Metal casting using a mold having attached risers Metal casting using a mold having attached risers

B - Operations, Transporting

22

D

B22D 18/06 (2006.01) B22C 9/08 (2006.01) B22D 39/06 (2006.01)

Patent

CA 2100831

Apparatus and method for countergravity casting a melt employs a particulate mass disposed in a container about a mold having a mold cavity, an ingate passage communicated to the mold cavity for supplying the melt to the mold cavity, and a separate, preformed riser forming member connected to the mold so as to communicate to an isolated and/or enlarged region of the mold cavity needing additional melt supply during solidification in the mold. The mold ingate passage and a source of the melt are communicated to conduct the melt through the ingate passage to the mold cavity to fill the mold cavity with the melt and form a riser of melt in the particulate mass. The riser of melt provides a source of additional melt for supply, as necessary, to the isolated and/or enlarged region during solidification of the melt in the mold cavity to accommodate melt shrinkage thereat.

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