Abstract: The processing quality of accessories, coarseness of their surface, and service life
of cutting tools are affected by chatter caused by high speed empty-cutting of thin rib. In order to
overcome those influences, the dynamics of thin rib amplitude was analyzed without direct
exciting vibration from external force during empty-cutting, then finite element method and
Taguchi experiment were applied to conduct simulation experiment and dynamic displacement
exciting vibration on the thin rib. It was proved that the width, height and thickness of thin rib
directly affected its displacement. The displacement of thin rib was decreased with increase of its
width at a certain height, while increased with decrease of its thickness at a certain width and
height. Meanwhile the displacement of thin rib was increased with increase of its height at a
certain width and thickness. Furthermore, the dynamics of energy in the thin rib during its
dynamic displacement was explored, and the time for complete attenuation of its energy was
obtained. Accordingly the processing path of thin rib was designed to avoid chatter.

Key words: thin rib, high speed empty-cutting, chatter