SLOT MACHINING TO CUT A BLADE ROOT HOLDING SLOT IN A TURBINE ENGINE DISK ELEMENT BY FORMING A PRECURSOR SLOT IN THE ELEMENT

摘要

PURPOSE: A slot machining is provided to easily and precisely process a blade sticking slot of a turbine engine disk. CONSTITUTION: A precursor slot having a first and a second sidewalls(26A,26B) and a bottom portion(30) is formed in a turbo engine disk element. A rotary bit is penetrated through the precursor for machining the bottom portion. The rotary bit is rotated centering a shaft(500) to be not perpendicular to a penetrating direction. A blade rood holding slot is cut in the element. A swirl shape is machined in the first and the second sidewalls.