Metal founding – Process – With measuring – testing – inspecting – or condition determination
Patent
1988-09-30
1989-04-11
Seidel, Richard K.
Metal founding
Process
With measuring, testing, inspecting, or condition determination
164 34, B22D 4600
Patent
active
048197114
ABSTRACT:
A method of controlling, during the act of mold fabrication in real time, the compactability and permeability of a sand mold containing an evaporative foam pattern, comprising: (a) while agitating a supply of loose, unbonded sand introduced about such pattern suspended in a flask, supplying a pressurized gas to one station of the sand while permitting the gas to exit from another station of such sand supply; and (b) proportionally measuring the pressure differential between such stations thereby tendering a proportional indicator of sand compaction. Agitation is preferably carried out in stages, the first stage of which comprises agitation by vibration at a rate to migrate the loose sand grains into the interior voids of the pattern, and a second stage in which the vibration is carried out at a rate until the relationship P.sub.2 =kP.sub.1 is satisified, where P.sub.1 is supply pressure, P.sub.2 is back pressure where the gas pressure attempts to migrate through the sand, and where k is a factor dependent on sand chemistry, shape, and moisture and is always less than one.
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Ford Motor Company
Malleck Joseph W.
May Roger L.
Seidel Richard K.
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