Method of making finished steel castings

Details Method of making finished steel castings Method of making finished steel castings

B - Operations, Transporting

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B22D 27/00 (2006.01) B21J 5/02 (2006.01) B22D 17/00 (2006.01) B22D 31/00 (2006.01)

Patent

CA 1047373

Abstract A method of finishing a casting which involves formation of a pat- tern having laterally extending gates, preparing a mold, pouring molten metal therein and permitting it to cool to form a transitional casting. The transitional casting is reheated to a holding temperature above the critical temperature and then, while the casting is still in the plastic state and near the critical temperature, it is acted upon by a set of dies having cooperating sheering edges located at the lateral surfaces thereof for shearing off the gates and parting line fins and having upper and lower sur- faces shaped in accordance with selected surfaces of the finished casting for forming these selected surfaces to desired shape. The casting is then cooled to ambient temperature at a controlled rate. Forming includes the bending, punching or piercing and coining to size of the casting while it is near the critical temperature. In one of the aspects of the present in- vention a method is provided for making a finished casting having an at least partially enclosed cavity or without draft and hence difficult and expensive to make by ordinary casting or forging techniques.

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