UNDERCUT FILLET RADIUS FOR BLADE DOVETAILS

摘要

An undercut fillet radius part for a blade dovetail is provided to resolve blade damage due to the wear of the blade dovetail having a radius part formed with an undercut in the profile formed of three parts. An undercut fillet radius part for a blade dovetail is formed at an intersection part between a dovetail platform and a dovetail pressure surface(16), and is in a multi-part profile for reducing stress of edge parts in a contact portion(38). The multi-part profile has at least three parts of a large radius part(32) a small radius part(34) and a flat part(36) for reducing stress.