Patent ID: 8701741

Claim:
Process for manufacturing hollow parts formed in two successive operations of casting material to make a semi-finished product and then forging, comprising the following operational phases: a) defining a final hollow part having an internal recess or recesses to be obtained after forging with deformation of solid or thinned-down sections according to environmental and mechanical constraints, b) modelling of the solid and thinned-down sections in zones of the part, c) formation of the thinned-down sections using one or more recyclable single-material cores made of sand or salt having core-prints made of the recyclable single-material for desired core positioning in a mold, said one or more cores being positioned locally at places requiring zones with a thinned-down section, and modelling of said one or more cores including the core-prints in the thinned-down sections, d) after modelling of the final part to be obtained and of the one or more cores, defining the semi-finished product and the one or more cores in initial forms having a different configuration from the forged one or more cores corresponding to the internal recess or recesses required in the forged part, e) casting of metal around said one or more cores in the initial forms to produce a semi-finished product with the one or more cores, forging and striking of said semi-finished product with the one or more cores resulting in the part and the one or more cores being deformed from the initial forms as to their final shapes, f) fettling of burrs of the casting material obtained by the forging free from materials other than the casting material, and g) removal of the recyclable single-material cores.