Investment casting paper liner and guard

Details Investment casting paper liner and guard Investment casting paper liner and guard

1997-10-28

1999-04-27

Davis, Robert

Metal founding

Means to shape a forming surface

Shell type mold making machine

164361, 164255, 164374, 164376, B22C 1308, B22C 2101, B22D 1806

Patent

active

058969136

ABSTRACT:
A paper receptacle is disclosed designed to improve the investment casting process in vacuum machines. The paper acts as both a vacuum liner and splash guard. It is fabricated as a perforated paper sheet having hooks, which is inserted in a cylindrical manner into casting flasks in order to provide a liner for congealing islands of solid investment plaster onto the surface of the casting flask resulting from the plaster slurry entering the holes; and a splash guard for investment slurry. After burnout, the liner facilitates the production of high-density metal porosity free castings at lower temperatures and in less time and with easy break away of investment plaster from the flask. The splash guard feature eliminates congealed slurry cleanup and prevents vacuum slurry boilover. The space saving resulting from this prevention enables more wax modules to be inserted into flasks increasing production.

REFERENCES:
patent: 1119373 (1914-12-01), Stealy
patent: 3443627 (1969-05-01), Watts
patent: 3520349 (1970-07-01), Watts
patent: 4825934 (1989-05-01), Kai
patent: 4915155 (1990-04-01), Martin
patent: 5257658 (1993-11-01), Perera

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