Self-tapping support for shell molds

Details Self-tapping support for shell molds Self-tapping support for shell molds

B - Operations, Transporting

22

D

22/74

B22D 19/00 (2006.01) B22C 13/08 (2006.01) B22D 18/06 (2006.01)

Patent

CA 1209781

SELF-TAPPING SUPPORT FOR SHELL MOLDS Abstract of the Disclosure A method of casting metal in a gas permeable shell mold in which a vacuum is applied to an external upper mold surface by engaging the mold in the downwardly facing opening of a generally cylindrical vacuum chamber, defined by a chamber wall with a threaded region sized and shaped to snuggly engage a side mold surface. Engagement is effected by forcing the mold into the chamber opening while causing relative rotation of the mold and chamber.

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