Gravity precision sand casting of aluminum and equivalent metals

Details Gravity precision sand casting of aluminum and equivalent metals Gravity precision sand casting of aluminum and equivalent metals

1994-10-07

1997-04-15

Lin, Kuang Y.

Metal founding

Process

Shaping liquid metal against a forming surface

164358, B22D 3700

Patent

active

056200447

ABSTRACT:
A technique and accompanying apparatus to promote increased yield, improved surface finish and microstructure, and faster cycling time for precision-sand casting process. Aluminum products are cast by: (a) forming a precision sand mold, devoid of risers and/or vents, and a gating system consisting of a gravity feeding sprue and one or more runners effective to carry molten metal from the sprue only to the bottom of the mold cavity; (b) planting a flow modifier in the gating system between the sprue and mold effective to convert the flow into laminar quiescent flow; and (c) filling the gating system with molten aluminum metal at a rate faster than 4 pounds/second as permitted by the laminar flow that more rapidly fills the mold and acts as a heat sink to prevent a drop in temperature of the in-coming molten metal and thereby increase yield as well as minimizing cycle time.

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