Dry-sand Moulding
The art of preparing dried moulds, either in flasks, to be subsequently dried in the oven, or in the floor, when the drying must then be accomplished by suitably improvised means before casting. Moulding in dry-sand admits of exceedingly large and intricate castings being made with much less risk than in green-sand. Moulds rammed in flasks may, when dry, be placed in any desired position for casting, without any possibility of damage; hence cylinders and all similar castings are moulded in dry-sand, and placed in a vertical position for pouring.
Dry-sand facing is used on the surface, but the flasks may be rammed with common sand off the floor. Usually the moulds are blackened and finished whilst green, and subsequently dried, closed, and cast. See DRY-SAND FACING; GREEN-SAND MOULDING; LOAM-MOULDING.