METHOD FOR MANUFACTURING CASTING MOULDS AND APPARATUS FOR CARRYING OUT SAID METHOD

摘要

The invention relates the field of foundry and namely to the technology and the equipment for manufacturing sand and loam casting molds with the use of a method of pulsed-air compacting of mold-sand in combination with compacting by compression. To improve the precision, to reduce the number of defects in the castings and to increase the metal content in the molds, the pulsed-air compacting of the mold-sand is supplemented by an operation of re-compacting the mold-sand by pressing which is performed with the pattern plate containing the patterns by means of the plate moving inside the cavity of the filling frame in the direction of the latticed pressing element which is subjected to a counter-pressure force corresponding in its value to the prescribed level of the half mold compaction. The process is realized with a device in which the pattern plate containing the patterns is mounted with the possibility of a reciprocal motion inside the cavity of the filling frame, and the pressing cylinder is mounted with the possibility to apply a force against the movable pattern plate. The filling with the mold-sand in layers is performed by a device providing the possibility of a reciprocal motion of the molding table relative to the feeder or, according to another embodiment, with the help of an oscillating mold-sand duct subjected to reciprocal and angular motions above the casting box with a determined rate. III. 2 pages