automatic molding line used casting flask
The flask is accessories in the casting molding machine.
A multi-part molding box (known as acasting flask, the top and bottom halves of which are known respectively as the
cope and drag) is prepared to receive the pattern. Molding boxes
are made in segments that may be latched to each other and to end
How it is used
For a simple object—flat on one side—the lower portion of the box,
closed at the bottom, will be filled with a molding sand. The sand
is packed in through a vibratory process called ramming, and in
this case, periodically screeded level. The surface of the sand may
then be stabilized with a sizing compound. The pattern is placed on
the sand and another molding box segment is added. Additional sand
is rammed over and around the pattern. Finally a cover is placed on
the box and it is turned and unlatched, so that the halves of the
mold may be parted and the pattern with its sprue and vent patterns
removed. Additional sizing may be added and any defects introduced
by the removal of the pattern are corrected. The box is closed
again. This forms a "green" mold which must be dried to receive the
hot metal. If the mold is not sufficiently dried a steam explosion
can occur that can throw molten metal about. In some cases, the
sand may be oiled instead of moistened, which makes possible
casting without waiting for the sand to dry. Sand may also be
bonded by chemical binders, such as furane resins or amine-hardened
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