process and apparatus for the construction of foundry moulds or cores to dimensionally stable from foundry sand binders

摘要

998,673. Heating moulds and cores; core boxes. SIEMENS-SCHUCKERTWERKE A.G. May 3, 1962 [May 3, 1961], No. 17106/62. Heading B3F. Moulds and cores are formed in boxes made of electrically non-conductive material and baked in the unopened boxes by dielectric heating. The blown cores in two part boxes 5, 6 are transferred by conveyer 11 to a metallic conveyer belt, serving as one electrode of a H.F. drier, beneath the other electrode 14. The box halves may have metallic layers 16, 17 forming auxiliary electrodes, and metallic inserts 18 to influence the heating. The box is preferably of cold-setting resin backed up by heat insulating synthetic plastic 25 such as foamed polysterol granulate. Specification 729,532 is referred to.