END MILL SPECIFICATION SETTING METHOD, PROCESSING CONDITION SETTING METHOD, AND PROCESSING METHOD

WIPO Patent Application WO/2019/082317

A1

Provided is an end mill (5). The maximum rotation speed, per one minute, of a main shaft to which the end mill is attached is Smax. The number of blades of the end mill (5) is N. The outer shape of the end mill (5) is Da. The natural frequency at which vibrations at the end of the end mill (5) reach a maximum level is ω1. ω1 and/or N are set so that when the diameter-direction infeed amount of the end mill (5) is set to Rd: i) ω1×60/N×6