Improvement of Dynamic Rigidity of Tool Holder by Applying High-damping Material

Abstract

Recently various types of high-damping material have been developed. The objective of this study is to investigate theoretically and experimentally how to apply a ferromagnetic type of high-damping material to tool holder aiming at its dramatic improvement of dynamic rigidity in a fashion of quantitative and programmable introduction of damping element, which has not been realized hitherto. Analytically it has been revealed that the highest dynamic rigidity of tool holder can be attained by combining the high-damping material and a statically high-stiff material such as sintered carbide approximately half and half in length. Finally, the analytical results have been confirmed through frequency response test and actual cutting test.