B - Operations – Transporting – 22 – D
Patent
B - Operations, Transporting
22
D
22/165
B22D 46/00 (2006.01) B22C 9/04 (2006.01) B22C 15/00 (2006.01)
Patent
CA 1329693
-17- 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 rendering 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 P2 = kP1 is satisfied, where P1 is supply pressure, P2 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.
607043
Ford Motor Company Of Canada Limited
Sim & Mcburney
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