Patent ID: 8567477
Filing Date: 2013-10-29
Classification: B22C,B33Y

Abstract:
1. A method of making a molding tool using a sacrificial mold core package, comprising: providing a thin layer of particulates; providing a sandprinting device; printing a binder on the thin layer of particulates with the sandprinting device representing a cross-sectional layer of the sacrificial mold core package; stacking a plurality of the thin layer of particulates to form a complete sacrificial mold core package, comprising a cope mold having a cavity, an inlet and one or more risers, a drag mold having a cavity, and a core; inserting the core into one of the cavity of the cope mold and the drag mold, assembling the complete sacrificial mold core package by aligning the cavity of the cope mold with the cavity of the drag mold to form a mold cavity; applying a molten material to the inlet of the cope mold of the sacrificial mold core package to fill the mold cavity from the drag mold to the cope mold and to partially fill the risers of the cope mold; allowing the molten material to harden; and allowing molten material from the risers to reenter the mold cavity as the molten material hardens.