Patents Assigned to Goerg Fischer AG
  • Process of producing molded body from green molding sand
    Patent number: 5137091
    Abstract: Green sand is packed as molding sand into a compression mold and the green sand is precompacted in the mold using a hydraulic press and thereafter is finally compacted after the precompaction wherein prior to precompaction recesses formed in the molding tools are subjected to a vacuum for drawing the molding sand into the recesses. In this way, even complicated mold cores can be produced satisfactorily and efficiently from green sand.
    Type: Grant
    Filed: June 18, 1990
    Date of Patent: August 11, 1992
    Assignee: Goerg Fischer AG
    Inventor: Heinz Duster