| 摘要 |
PROBLEM TO BE SOLVED: To perform a working operation at high speed by providing a rotating shaft having an axis at a prescribed relative angle with respect to the axis of a main shaft and a turning shaft having an axis parallel with the axis of the main shaft when the axis of the main shaft is in a vertical direction, setting a relative angle formed by the axis of the rotating shaft and the axis of the turning shaft to an angle within a range of exceeding 45° to 70° or smaller, turning the rotating shaft and the turning shaft on their axes, and changing an attitude angle of a ball end mill. SOLUTION: There are provided the rotating shaft 2 having the axis at the prescribed relative angle θ with respect to the axis 1a of the main shaft 1 and the turning shaft 3 having the axis parallel with the axis of the main shaft in a state that the axis of the main shaft is in the vertical direction. In a multi-shaft working method, the rotating shaft and the turning shaft turn their axes, and the attitude angle γ of the ball end mill with respect to an object W to be worked is changed to work the object to be worked in the ball end mill. The relative angle formed of the axis of the rotating shaft and the axis of the turning shaft is set within a range of exceeding 45° to 70° or smaller. COPYRIGHT: (C)2011,JPO&INPIT
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