Abstract
Shrink-fit holders are used widely in high-speed machining because of their high concentric and rigid clamp performance. In this paper, a method to determine the contact stiffness and contact force of shrink-fit tool-holder joint is proposed. The relationship between the contact stiffness and the normal contact load is deduced based on Hertz contact theory and fractal geometry theory. The contact force at the interface is obtained through finite element contact analysis. The identified contact stiffness is incorporated into the finite element model of the tool-holder assembly, which is used to predict the tool point frequency response function of the assembly. The predicted frequency response function agrees with that of the experiment, which verifies the proposed identification method. The effect of radial interference, tool insertion length, and rotational speed on contact behaviors between the shrink-fit tool-holder connection is determined, which is informative for the application and design of the tool-holder assembly.
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