Abstract
The aim of this paper is to clarify the influence of additives to a boring bar on the dynamic characteristics and chatter stability of the boring bar. In this study three types of the boring bar are provided, the side faces of which are cut off and filled with the additives ; i. e., polyurethane rubber, composite of steel and epoxy resin, and solder. The results which are obtained by the shock excitation tests and the cutting tests are as follows : (1) For the boring bars provided, the effective damping ratio ζ of the boring bar is affected significantly by the additives, on the other hand the effective stiffness k is almost independent of those. (2) The boring bar to which the solder is added has a higher performance index kζ and the chatter stability than the others. (3) It becomes clear that the suppression effect of the additives on the chatter stability can be evaluated by the product ρδ of the density ρ and the logarithmic decrement δ of the additives.
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