Joint Stiffness Estimation Between Spindle-Tool Holder by Considering Clamping Forces

Abstract

The productivity and the quality of machining depend on the dynamic characteristics of spindle-holder joint interface. However, spindle-holder system is one of the weak joint in the machining centres; therefore, it causes poor machining performances. The main objective of machine tool industries is to improve the accuracy of the machined component, achieve good surface finish, increase tool life and metal removal rate. To achieve these requirements, it becomes predominant to identify the joint stiffness for understanding the dynamic characteristics of spindle-holder joint interface. In this paper, author discussed in detail on how the joint stiffness plays an important role in the dynamics by considering the surface fractal topology theory.Here, the 3D CAD model of BT-40 spindle and Tool holder has been modelled and numerically analysed in FEA software by considering the typical Clamping forces, then obtained natural frequency from FEA is correlated with the experimental modal analysis results, this study will be more informative for understanding the influence of joint stiffness behaviour on the dynamics of spindle-holder system.