Apparatus and method for producing shell-like molds

摘要

An apparatus to produce a shell-like mold by vacuum sucking molding sand into a shell-like cavity defined by a cope and a drag is disclosed. The apparatus includes a drag (20) and a cope (22) mounted on the drag so that they define a shell-like cavity (28) between them. The drag holds on its upper surface a pattern (26). The drag has a plurality of sucking apertures (32) at places adjacent to the perimeter of the pattern. The sucking apertures communicate with a vacuum source (40). The cope has a single molding-sand-supplying bore (30) communicates with the cavity. To produce a shell-like mold, the molding sand is introduced from the bore (30) into the cavity (28) by means of a vacuum source (40). <IMAGE>