Abstract Apparatus, methods and molds for casting metal in an evacuatedinert gas atmosphere. The apparatus comprises a sealable melting and mold pouring chamber having a sealable loading compartment mounted thereon with a conduit having a valve communicating therebetween and a sealable mold container having a bottom opening for sealing around the lower open end of a gas permeable refractory shell mold sealingly supported therewithin and extending downwardly therebeyond. Power means supports the container from above for movement between the chamber and compartment through the conduit to a melting crucible within the chamber directly beneath the container. The mold is loaded and unloaded with the container in raised position within the compartment while maintaining the chamber in evacuated condition by closure of the valve. A movable drip guard is mounted within the loading compartment between the valve and the container in its raised position. The refractory, gas permeable, shell mold preferred has a lower open end with a central vertical riser passage and may have a plurality of overlapping mold cavities clustered thereabout connected to the riser passage by gate passages. The cross section area dimension of the riser passage is at least one inch and five times as great as the cross section area dimension of a gate passage, so that molten metal can be drained from the riser passage to provide discrete unconnected cast parts from a single mold after the mold is separated from them.
Inventors
👤 George D Chandley
👤 John N Lamb
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-11-04 09:36
CPC Classifications
B; B22; B22D; B22D18/00; B22D18/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
159 words
A method of casting in a refractory, gas permeable, shell mold comprising the steps of providing a mold having a lower open end with a central vertical riser passage having a plurality of mold cavities clustered thereabout connected to said riser passage by gate passages, the cross section area dimension of said riser passage is at least five times as great as the cross section area dimension of a gate passage, providing a crucible having surrounding induction coils for holding molten metal, stirring said molten metal by means of said coils causing outward surface movement thereof along its surface to carry impurities away from the central area of said crucible, lowering the lower open end of said mold beneath the surface of the central area of said crucible, causing molten metal to fill said riser passage and said mold cavities through said gate passages and draining molten metal from said riser passage after solidification thereof in said mold cavities.
Claim 2
Independent Claim
159 words
A method of casting in a refractory, gas permeable, shell mold comprising the steps of providing a mold having a lower open end with a central vertical riser passage having a plurality of mold cavities clustered thereabout connected to said riser passage by gate passages, the cross section area dimension of said riser passage is at least five times as great as the cross section area dimension of a gate passage, providing a crucible having surrounding induction coils for holding molten metal, stirring said molten metal by means of said coils causing outward surface movement thereof along its surface to carry impurities away from the central area of said crucible, lowering the lower open end of said mold beneath the surface of the central area of said crucible, causing molten metal to fill said riser passage and said mold cavities through said gate passages and draining molten metal from said riser passage after solidification thereof in said mold cavities.