Ralph Pi Adler

US Patent:

47259620, Feb 16, 1988

Filed:

Apr 17, 1986

Appl. No.:

6/852998

Inventors:

Shih-Chen Hsu - Weston MA
Ralph P. Adler - Wellesley MA

Assignee:

GTE Laboratories Incorporated - Waltham MA

International Classification:

G06F 1546
B22D 1100

US Classification:

364476

Abstract:

A method and apparatus for maintaining a constant ejection pressure in a melt spinning process for converting a molten metal into a metal foil of a uniform thickness. The backpressure exerted against inert gas being injected into the bottom of a crucible containing molten metal is monitored. Any negative rate change in the backpressure is noted and the gas overpressure in the crucible is then increased to return the back-pressure to its original value. In another embodiment the gas flow rate of the inert gas is monitored. Any positive rate change in the flow rate is noted and the gas overpressure is then increased to return the flow rate of the gas back to normal. This maintains a constant ejection pressure of molten metal passing through the orifice of the crucible producing foil with a uniform thickness.