Patent ID: 7788806

Claim:
A process for manufacturing a blisk, comprising: arranging a plurality of blades in the form of a ring in a mold with symmetry of revolution, each of the blades including a shroud and a root, the shroud disposed at an upper end of the blade and an airfoil machined with a twist along a radial axis, and the root includes a shoulder disposed at a front end of the root which cooperates with a holding device to prevent the blade from moving radially during welding, and a friction surface which is consumed during welding; casting a degradable material, preheated to a temperature above its melting point, onto the ring of blades arranged in the mold; wherein the mold includes a bottom ring, an outer ring, and a top ring, the bottom ring includes an annular wall disposed at an inner periphery of the bottom ring and extends axially toward an inside of the mold, and the plurality of blades are arranged such that the friction surface of each of the blades contact the annular wall, and the top ring is of plane shape and is fastened to the bottom ring; extracting a molded ring which is obtained after the degradable material has solidified; welding the molded ring onto a disk; eliminating the degradable material, wherein the welding is performed by friction welding, wherein the plurality of blades are arranged such that a lateral edge of the shroud of each of the blades abuts a corresponding lateral edge of the shroud of an adjacent blade and a prestress is exerted on the blades, and the top ring presses the root of each of the blades to exert the prestress on the blades when the top ring is fastened to the bottom ring.