Impeller and method of manufacturing the same
View Patent ↗A method of manufacturing an impeller includes: providing a disc comprising a plurality of blades, casting a shroud to a first state in a mold, providing a mounting space in the mold, mounting the disc in the mounting space and casting the shroud to a second state with the mounted disc.
1. A method of manufacturing an impeller, the method comprising:
providing a disc comprising a plurality of blades;
injecting a melted metal into a shroud forming space of a mold, and cooling the melted metal to a semi-solid state to form a shroud in the semi-solid state;
providing a mounting space in the mold;
mounting the disc in the mounting space to couple the plurality of blades to the shroud in the semi-solid state in a contacting manner; and
cooling the shroud to a completely solidified state to bond the shroud with the plurality of blades,
wherein the mold comprises an outer cast and a center cast that form the shroud forming space corresponding to a shape of the shroud.
2. The method of claim 1 , wherein the providing of the mounting space comprises preparing the mounting space of the disc by removing the center cast.
3. The method of claim 2 , further comprising removing the outer cast.
4. The method of claim 1 , further comprising polishing a surface of the shroud.
5. A method of manufacturing an impeller, the method comprising:
providing a disc comprising a plurality of blades;
injecting a melted metal into a shroud forming space of a mold, and cooling the melted metal to a semi-solid state to form a shroud in the semi-solid state;
providing a mounting space in the mold;
mounting the disc in the mounting space to couple the plurality of blades to the shroud in the semi-solid state in a contacting manner; and
cooling the shroud to a completely solidified state to bond the shroud with the plurality of blades,
wherein the providing of the disc comprises filling a filling material between the plurality of blades.
6. The method of claim 5 , wherein the filling material comprises molding sand.
7. The method of claim 6 , further comprising removing the molding sand by beating and breaking the molding sand.
8. The method of claim 5 , wherein the filling material comprises paraffin.
9. The method of claim 8 , further comprising removing the paraffin by thermally melting the paraffin.