5.65 Two halves of a mold (cope and drag) are weighted down to keep them from separating under the pressure exerted by the molten metal (buoyancy). Consider a solid, spherical steel casting, 225 mm in diameter, that is being produced by sand casting. Each flask (See Fig. 5.10 ) is 0.5 m by 0.5 m and 350 mm deep. The parting line is at the middle of the part. Estimate the clamping force required if the molten metal has a density of 8 . 96 g/c m 3 and the sand has a density of 1 . 2 g/c m 3