US 8,256,590 B2 · Vibration suppressing device and vibration suppressing method for machine tool

Abstract

A vibration suppressing device and a vibration suppressing method that are capable of obtaining an accurate optimum rotation speed and shortening a time period from generation of chatter vibration to calculation of the optimum rotation speed are provided. The vibration suppressing device includes: vibration sensors for detecting time-domain vibrational accelerations of a rotary shaft in rotation; and a control device for calculating a chatter frequency and a frequency-domain vibrational acceleration of the rotary shaft at the chatter frequency on the basis of the time-domain vibrational accelerations detected by the vibration sensors, and when the calculated frequency-domain vibrational acceleration exceeds a predetermined threshold value, calculating an optimum rotation speed on the basis of a predetermined parameter, and rotating the rotary shaft at the calculated optimum rotation speed.

Claims22

Dependent claims

A vibration suppressing device for suppressing vibrations generated during machining a work in a machine tool, comprising:

a rotary shaft for rotating a tool or a work;
detecting means to detect a time-domain vibration due to the rotating rotary shaft;
calculating means to calculate a chatter frequency and a frequency-domain vibration at the chatter frequency on a basis of the time-domain vibration detected by the detecting means, to calculate phase information using the chatter frequency and number of tool blades of the machine tool, and calculate an optimum rotation speed of the rotary shaft for suppressing chatter vibration on a basis of the phase information when the calculated frequency-domain vibration exceeds a predetermined threshold value;
and
rotation speed controlling means to rotate the rotary shaft at the optimum rotation speed calculated by the calculating means, wherein the chatter vibration generated during the machining of the work by rotation of the rotary shaft is suppressed.

2 more elements

A vibration suppressing method for a machine tool provided with a rotary shaft for rotating a tool or a work, the vibration suppressing method comprising:

a detecting step of detecting a time-domain vibration due to the rotating rotary shaft;
a calculating step of calculating a chatter frequency and frequency-domain vibration at the chatter frequency on a basis of the time-domain vibration detected in the detecting step, calculating phase information using the chatter frequency and number of tool blades of the machine tool, and then calculating an optimum rotation speed of the rotary shaft capable of suppressing chatter vibration on a basis of the phase information when the calculated frequency-domain vibration exceeds a predetermined threshold value;
and
a controlling step of rotating the rotary shaft at the optimum rotation speed calculated in the calculating step, wherein
the chatter vibration generated during the machining of the work by rotation of the rotary shaft is suppressed.

2 more elements

Dependencies are inferred from the claim text.

Vibration suppressing device and vibration suppressing method for machine tool

Life of this patent

Vibration suppressing device and vibration suppressing method for machine tool

Life of this patent

Abstract

Claims22