Vacuum casting apparatus and method using flange-free stalk

Details Vacuum casting apparatus and method using flange-free stalk Vacuum casting apparatus and method using flange-free stalk

1996-04-04

1997-04-15

Lin, Kuang Y.

Metal founding

Process

Shaping liquid metal against a forming surface

164255, B22D 1806

Patent

active

056200412

ABSTRACT:
A vacuum casting apparatus secures gas tightness of the die cavity without welding together a straight-tubular stalk and a flange or flanges, thus permitting an excellent quality casting. A flange is mounted on an outer periphery of a stalk, and secured between a gas-tight chamber and a die, forming a recess bounded by the die, a surface of the flange, and an outer surface of the stalk. The space inside the chamber is evacuated to a first degree of vacuum so that molten metal is withdrawn into the stalk and overflows the end of the stalk, and flows into the recess. Molten metal in the recess cools and solidifies to form a gas-tight seal between the stalk and the flange. Then, the space inside the chamber is evacuated to a second degree of vacuum and molten metal is withdrawn through the stalk and into the cavity of the die.

REFERENCES:
Soviet Patent Abstracts, SU-A-1637 949, PQ section, week 9209, Apr. 15, 1992, Derwent Publications.

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