Apparatus and process of forming an integrally bladed rotor with cooled single crystal blades and an equiax nickel disk
An air cooled integrally bladed rotor with single crystals turbine rotor blades having cooling air passages formed into an equiax rotor disk, where a mold having expendable Molybdenum tooling and reusable molybdenum tooling is used to form the IBR. An annular blade ring with openings is used to secure the single crystal rotor blades within the mold, and a number of tube tools are inserted into a bottom end of each blade that forms a cooling air supply passage within the rotor disk. Two molybdenum circular shaped hubs are used to secure a bottom end of the tube tools with the mold. The mold is filled with metal powder and high pressure is used to solidify the powder to form the IBR. Expendable tooling is removed using sublimation when exposed to oxygen. Reusable tooling is reused to form additional IBRs.
1. A mold to form an air cooled integrally bladed rotor for a gas turbine, the air cooled integrally bladed rotor having a plurality of single crystal turbine rotor blades embedded within an equiax rotor disk, the mold comprising:
a forward die with an axial center opening to form a forward side of the rotor disk;
an aft die with an axial center opening to form an aft side of the rotor disk;
an inner cylindrical shaped center die capable of fitting within the axial center openings of the forward die and the aft die;
an annular blade ring with a plurality of openings to fit from inside a plurality of single crystal turbine rotor blades;
a plurality of tubular tools extending from the inner cylindrical shaped center die to near to the underside of the annular blade ring;
a forward outer center die and an aft outer center die; and
the forward and aft outer center dies both have ends that fit the tubular tools to secure a lower end of the tubular tools to the mold.
2. The mold to form an air cooled integrally bladed rotor of claim 1 , wherein the forward die and the aft die and the inner cylindrical shaped center die are reusable toolings.
3. The mold to form an air cooled integrally bladed rotor of claim 2 , wherein the annular blade ring tubular tools and the forward and aft outer center dies are expendable toolings.
4. The mold to form an air cooled integrally bladed rotor of claim 1 , wherein the openings of the annular blade ring are shaped to fit a curvature of an airfoil of the single crystal turbine rotor blades.
5. The mold to form an air cooled integrally bladed rotor of claim 1 , wherein the forward and the aft outer center dies fit over the inner cylindrical shaped center die.
6. The mold to form an air cooled integrally bladed rotor of claim 3 , wherein the annular blade ring tubular tools and the forward and aft outer center dies are formed of a material that can be sublimated out of the integrally bladed rotor using oxygen.
7. The mold to form an air cooled integrally bladed rotor of claim 1 , wherein the annular blade ring, tubular tools and the forward and aft outer center dies are expendable toolings.
8. The mold to form an air cooled integrally bladed rotor of claim 7 , wherein the annular blade ring, tubular tools and the forward and aft outer center dies are formed of a material that is configured to allow the material to be sublimated out of the integrally bladed rotor using oxygen.