| 摘要 |
PROBLEM TO BE SOLVED: To effectively suppress chatter vibrations by instantly making rotational speeds optimum for respective cases by clearly distinguishing forced chatter vibrations and regenerative chatter vibrations. SOLUTION: This vibration suppressing apparatus performs the Fourier analysis of vibrational acceleration in S1, and calculates maximum acceleration and its frequency in S2. The maximum acceleration is compared with a preset required threshold value in S3. When the maximum acceleration exceeds the threshold value, a k value and phase information are calculated in S4 from the chatter frequency, the number of the cutting edges of a tool, and the rotational speed of a rotary shaft. The phase information is compared with constants 1, 2 in S5. When the phase information is larger than the constant 1 and is smaller than the constant 2, it is judged that the forced chatter vibration has been generated, and the k1 value is calculated in S6 based on the following changing expression (1): k1 value=k value+constant 3+1. On the other hand, when the phase information is outside the range described above, it is judged that the regenerative chatter vibration has been generated, and the k1 value is calculated in S7 based on the following changing expression (2): k1 value=k value+1. Then, the optimum rotational speed is calculated in S8 from the chatter frequency, the number of the cutting edges of the tool, and the k1 value. COPYRIGHT: (C)2009,JPO&INPIT
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