Method and device for forming the vents in the foundry moulds in the sand molding

摘要

P process and apparatus for forming the air ports or openings in the foundry moulds in the sand molding, constituted by an upper mold and a lower mold, the upper mold with blind holes conical, starting from the plane of separation of the moulds and to be drilled in order to form the air ducts or vents. / p & & p & the cavity of the mold is placed in a raised pressure and the material which breaks up during the drilling is sucked in by upward directly at the location of the drilling. / p