Affiliations: School of Mechanical Science and Engineering, Huazhong
University of Science and Technology, Wuhan, Hubei, China | State Key Laboratory for Digital Manufacturing
Equipment and Technology, Huazhong University of Science and Technology, Wuhan,
Hubei, China | Mechanics and Electricity Department, Nanyang
Institute of Technology, Nanyang, Henan, China
Note: [] Corresponding author: Bo Wu, State Key Laboratory for Digital
Manufacturing Equipment and Technology, Huazhong University of Science and
Technology, Wuhan 430074, Hubei, China. E-mail: bowu@mail.hust.edu.cn
Abstract: In order to ensure the stability of machining processes, the tool
point frequency response functions (FRFs) should be obtained initially. By the
receptance coupling substructure analysis (RCSA), the tool point FRFs can be
generated quickly for any combination of holder and tool without the need of
repeated measurements. A major difficulty in the sub-structuring analysis is to
determine the connection parameters at the tool-holder interface. This study
proposed an identification method to recognize the connection parameters at the
tool-holder interface by using RCSA and particle swarm optimization (PSO). In
this paper, the XHK machining center is divided into two components, which are
the tool and the spindle assembly firstly. After that, the end point FRFs of
the tool are achieved by mode superposition method. The end receptances of the
spindle assembly with complicated structure are obtained by impacting test
method. Through translational and rotational springs and dampers, the tool
point FRF of the machining center is obtained by coupling the two components.
Finally, PSO is adopted to identify the connection parameters at the
tool-holder interface by minimizing the difference between the predicted and
the measured tool point FRFs. Comparison results between the predicted and
measured tool point FRFs show a good agreement and demonstrate that the
identification method is valid in the identification of connection parameters
at the tool-holder interface.
