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US 4,536,932 AGranted
Method for eliminating low cycle fatigue cracking in integrally bladed disks
AssigneeUnited Technologies Corporation
InventorRoy L. Athey
Life of this patent
Estimating the term…
Abstract
Stress relief for the rim of an integrally bladed rotor made from a forging preform is provided by forming a plurality of radially extending circumferentially spaced-apart slots around the periphery of the preform. The slots are forged closed in a subsequent forming step. An oxide layer on the slot surfaces prevents the surfaces from bonding together when forged closed. The blades are formed between slots during the forging or by machining after forging.
Claims7
In a method for forming an integrally bladed rotor disk from a plate-shaped forging preform having a rim, the steps of:
- forming a plurality of circumferentially spaced-apart slots in said preform, said slots having a base, each slot extending radially from said rim to said base and extending axially through the full thickness of the preform;
- and
- forming the rotor blades from the preform and forging the disk from the preform, including completely closing said slots from the slot base to the slot rim by forging to form forging laps along the radial extent of each slot without bonding together the surfaces of said slots, said forging laps being located circumferentially between adjacent blades.
Dependencies are inferred from the claim text.