Patent ID: 6499529
Filing Date: 2002-12-31
Classification: B22D

Abstract:
A method of countergravity casting a plurality of articles, comprising:providing a ceramic mold having an upstanding riser passage and a plurality of mold cavities disposed along a length of said riser passage at different elevations, each mold cavity communicating to said riser passage via a gate passage, causing molten metal to flow upwardly from a source into said riser passage for supply to said mold cavities via their gate passages, rotating said mold so that molten metal that resides in said gate passages is subjected to centrifugal force in a direction toward said mold cavities, draining molten metal from said riser passage before molten metal in said mold cavities and said gate passages solidifies, leaving said gate passages at least partially filled with molten metal for supply to said mold cavities in response to shrinkage as molten metal therein solidifies while said mold is rotated, and solidifying molten metal in said mold cavities while rotating said mold to form a plurality of individual solidified cast articles in said mold cavities.