Patent ID: 9452469
Filing Date: 2016-09-27
CPC Classification: B22C,B22D

Claim Text:
1. A method for producing a hollow metal part by casting, wherein: a destructible core is provided including a body made of aggregated materials, and a shell which surrounds said body and adheres thereto; the core is positioned in a mold; a metal is melted and liquid metal is injected into the mold, surrounding the core, the core embodying a space within the part; after solidification of the part, the body is disaggregated and removed through removal openings provided in the shell and the part; and said shell is destroyed and removed through removal openings provided in the part; and wherein the destructible core includes, in addition, a framework which passes through the body of the core and is connected to the shell, and wherein said framework is destroyed and removed at the same times as the body and/or the shell wherein, to produce the core: the body of the core is fabricated by aggregation of materials in a box equipped with pins passing through an interior of the box, so that the body, once extracted from the box, exhibits holes in place of the pins, and said holes are filled with a material constituting the framework, and wherein the body of the core is dipped in a first slurry to form the framework and a lower layer of the shell, and afterward in one or more slurries to form one or more upper layers of the shell.