Method and apparatus for the production of foundry molds

Abstract

In the production of a foundry mold utilizing mold forming apparatus which includes a pattern device, a molding box arranged on the pattern device and a frame attached to the molding box, a surplus amount of molding sand is initially filled in over the pattern device in excess of the amount required for the production of the mold and during the production operation the excess sand is stripped off by profiled stripping means which are moved relative to the molding box to strip the excess sand along a profile which is dependent upon the configuration of the pattern device. In one aspect of the invention a single profiled stripper may be used and in another aspect a plurality of strippers having differring profiles may be employed. In other aspects of the invention different mechanisms are applied to move the stripping means relative to the molding sand by movement of the pattern device either along a linear path or through a circular path. The stripping means may be formed as stripper plates having an arcuate configuration or they may comprise flat planar profiled strippers. In a further aspect of the invention, the pattern device together with the molding box is rotatably movable from a filling position to a compression position while the stripping means are simultaneously rotated in the same angular direction as the molding box but in such a manner as to effect opposed linear movement between the molding box and the stripping means thereby to effect performance of the stripping operation. The method of the invention requires only a single compression operation which may involve either compression of the molding sand or simultaneous compression and jarring.