2 results about "Chatter vibration" patented technology

This invention provides a technology for identifying the type of chatter vibration occurring when chatter vibration is present. [Solution] The method for analyzing self-excited chatter vibration includes a first step (S10) of acquiring vibration data in two directions different from the tool rotation axis direction, a second step (S12) of acquiring the frequency components of the self-excited chatter vibration in two directions from the vibration data in two directions, and a third step (S14) of determining whether or not mode-coupling type chatter vibration is occurring based on the frequency components of the self-excited chatter vibration in two directions.

The present invention provides a machine tool and control device that can obtain modal parameters without performing a hammering test. [Solution] A machine tool 10 comprising a spindle 110, a rotating mechanism 120, a tool 210, a moving mechanism for relatively moving the spindle 110 and the tool 210, a displacement detection unit 210X for detecting the displacement of the tool 210, and a cutting force detection unit 210Y, further comprising a control unit C having an acquisition unit C1 for acquiring detected machining data, a storage unit C2 for storing the machining data, and a calculation unit C3 for calculating the machining data, wherein the control unit C uses the machining data stored in the storage unit C2 under multiple machining conditions when chatter vibration occurs to cause the calculation unit C3 to identify the equivalent mass m, damping coefficient c, and spring constant k when the structure involved in holding the tool 210 is treated as a 1-degree-of-freedom vibration model.