END MILL MACHINING DEVICE, CAM DEVICE, NC PROGRAM, AND MACHINING METHOD

摘要

[Object] To provide an end mill machining apparatus, a CAM apparatus, an NC program, and a machining method which suppress regenerative self-excited vibration and mode-coupling self-excited vibration. [Means for Solution] An end mill machining apparatus 100 includes an end mill 10, and a control section 150 for controlling the end mill 10. The ratio of the protrusion length of the end mill 10 to the diameter of the end mill 10 falls within a range of 5 to 50. The end mill 10 is a variable pitch, uniform helix type or a variable helix type. The control section 150 controls the end mill 10 such that the contact angle between the end mill 10 and a workpiece M1 during machining becomes equal to or smaller than a critical contact angle ¸ lim .