Abstract
We have developed a new evaluation method to obtain the dynamic characteristics at the cutting point during cutting directly by machining the specific workpiece. An NC lathe is adopted as the target machine tool. Three-dimensional cutting forces are generated during turning operation. These cutting forces change periodically when the cross sectional profile of workpiece that consists of polygon. Then, the periodic excitation forces are observed from there cutting forces generated at the contact point between tool and workpiece. Further, the excited frequency of periodic and sinusoidal forces obtained by machining the non-circle workpiece depending on the workpiece revolution, the desired frequency is to be obtained by changing the spindle revolution variably from DC to maximum revolution. These combinations lead the excitation forces in frequency domain to the desired frequency range and enough force amplitude as same as the swept sinusoidal excitation technique. The pseudo inverse m atrix is used to obtain the approximate solution of the dynamic characteristics. In this report, the proposed method and its evaluation results are reported. Further, the calculated results of transfer functions of an NC lathe are introduced.
Published Version
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