Metal founding – Process – Shaping liquid metal against a forming surface
Patent
1996-09-17
1998-03-10
Batten, Jr., J. Reed
Metal founding
Process
Shaping liquid metal against a forming surface
164133, 1641552, 164306, 164337, 222599, B22D 1804
Patent
active
057250430
ABSTRACT:
Molten metal is delivered from a master furnace to the molten metal holding chamber of a low pressure casting machine by a launder assembly having a unitary, quickly replaceable, valve assembly including a valve which, when closed, prevents flow of the molten metal from the master furnace to the holding vessel. The valve has a plug mounted for rotation in a valve body which may be made from graphite. In a modification, the valve has a port centered in a valve plate and a movable plug which may be made from aluminum titanate. In operation, the valve is opened to permit the molten metal within the master furnace and the holding vessel to seek a substantially uniform level and closed when the low pressure casting process is initiated. While the valve is closed, a pressurizing gas is introduced into the holding vessel above the level of the molten metal therein so that molten metal will rise up a riser tube into the cavity of a mold or other molten metal-receiving member. After the cavity is filled and before the next molding operation is begun, the pressurizing gas is exhausted so the pressure above the molten metal in the holding vessel is lowered to or near to atmospheric pressure and the valve opened so that the molten metal in the holding vessel and the master furnace again begins to seek a substantially uniform level. This process can be repeated indefinitely to produce plural molded parts.
REFERENCES:
patent: Re27945 (1974-03-01), Hunt et al.
patent: 925809 (1909-06-01), Henss
patent: 1981825 (1934-11-01), Miller, Jr.
patent: 2352799 (1944-09-01), Newton
patent: 2364615 (1944-12-01), Beckes
patent: 2854228 (1958-09-01), Franks et al.
patent: 3032841 (1962-05-01), Sylvester
patent: 3044489 (1962-07-01), Raub et al.
patent: 3552478 (1971-01-01), Lavener
patent: 3554268 (1971-01-01), Taylor et al.
patent: 3940264 (1976-02-01), Sievrin
patent: 4047558 (1977-09-01), Kotthoff et al.
patent: 4053012 (1977-10-01), Farmer
patent: 4143687 (1979-03-01), Belloci
patent: 4153100 (1979-05-01), Balevski et al.
patent: 4277539 (1981-07-01), Keller et al.
patent: 4860820 (1989-08-01), Pereira
patent: 4967827 (1990-11-01), Campbell
patent: 5022458 (1991-06-01), Smith
patent: 5085356 (1992-02-01), Waltenspuhl
patent: 5092500 (1992-03-01), Weber et al.
patent: 5303764 (1994-04-01), Sasaki et al.
123 Engineering 185-188, vol. 23, Mar. 1981, No. 3, London, Great Britain.
Brochure titled "Detrick Interstop" Published by M. H. Detrick Co., 1983.
Brochure titled "Furnace for Melting and Holding Alumunum" Published by Frank W. Schaefer Inc., 1992.
Miller Norman L.
Schaefer Carl W. D.
Schaefer Richard L.
Williamson James M.
Batten, Jr. J. Reed
Dybvig Roger S.
Frank W. Schaefer Inc.
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