Metal founding – Process – Shaping liquid metal against a forming surface
Patent
1979-03-02
1980-09-16
Baldwin, Robert D.
Metal founding
Process
Shaping liquid metal against a forming surface
164 80, 164112, B22D 1902, B22D 1908
Patent
active
042224306
ABSTRACT:
A valve element is formed with a groove or notch in the region of the valve seat. The valve element is then introduced into a crucible pot which has the outer shape of the valve, when coated, and a cover is placed thereover completing the shape of the valve, when coated. Granular coating material, for example "Colmonoy 6" (0.75% C, 4.25% Si, 13 to 20% Cr. remainder Ni, 4.75% Fe and 3% B), is placed on the valve element, the cover is then placed thereover, leaving a small gap of the thickness of the coating around the valve element. The assembly is then subjected to vacuum, about 10.sup.-6 -10.sup.-7 torr, and heated to liquefaction temperature of the armor-coating material, which will fill the space between the valve element and the crucible pot and cover, thus coating the valve element with a thin coating therearound, and a thick layer in the region of the groove of the valve element, which may be in the order of millimeters, whereas the remainder may be in the order of thousandths of a millimeter.
REFERENCES:
patent: 2273250 (1942-02-01), Charlton
patent: 2358090 (1944-09-01), Longoria
Baldwin Robert D.
Maschinenfabrik Augsburg-Nurnberg Aktiengesellschaft
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