Method of making a casting having an embedded preform

Details Method of making a casting having an embedded preform Method of making a casting having an embedded preform

1994-08-05

1996-06-11

Lavinder, Jack W.

Metal founding

Process

Shaping a forming surface

164 98, 164120, B22C 904, B22D 1902

Patent

active

055246966

ABSTRACT:
A "lost foam" method of making a casting having a preform embedded at a selective location therein including the steps of: engulfing a porous preform in a fugitive pattern; embedding the pattern in a loose sand mold in a vessel; pouring molten metal into the mold cavity via a sprue and runner system formed in the sand bed so as to destroy the pattern and fill the mold cavity with metal; pressurizing the vessel to force molten metal from the cavity into the porous preform; replacing metal lost from the cavity with make-up metal from the sprue and runner system; allowing the casting to solidify; and removing the casting from the sand bed.

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patent: 5263533 (1993-11-01), Draschitz et al.
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