0
research-article

Coupled Model of Rotary-tilting Spindle Head for Pose-dependent Prediction of Dynamics

[+] Author and Article Information
Chao Du

School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710049, China; State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an 710049, China
duchao-2008@163.com

Jun Zhang

School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710049, China; State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an 710049, China
junzhang@xjtu.edu.cn

Dun Lu

School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710049, China; State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an 710049, China
dunnlu@xjtu.edu.cn

Huijie Zhang

School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710049, China; State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an 710049, China
zhj3632@163.com

Wanhua Zhao

School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710049, China; State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an 710049, China
whzhao@mail.xjtu.edu.cn

1Corresponding author.

ASME doi:10.1115/1.4040155 History: Received August 03, 2017; Revised April 25, 2018

Abstract

Five-axis machine with rotary-tilting spindle head (RTSH) is always used for sculptured surface machining, and the tool-tip dynamics in various machining postures along the tool path directly affect the machining accuracy and stability. To rapidly evaluate the tool-tip dynamics at different postures during the structural design of tool-spindle-spindle head (TSSH) assembly, this paper proposes a coupled dynamic model of tool-spindle-bearing system (TSBS) and RTSH. The model is a rigid-flexible multibody dynamic model with 36 degrees of freedom (DOFs), where in the rotary shaft, swivel shaft and housing are treated as rigid bodies; the tool, toolholder and spindle shaft are modeled by reduced beams; the bearings and flexible joints are modeled as spring-damping elements. The fully Cartesian coordinates and Lagrangian method are employed to deduce a general parametric dynamic equation. The analytical method for calculating the contact stiffness of bearings and flexible joints is systematically presented, including tool-holder joint, holder-spindle joint, spindle bearings, hirth coupling, and the bearings and locking joints of rotary and swivel shafts. The model is verified by the frequency response functions (FRFs) testing and modal testing at different postures. The experimental results show that the proposed model can be used for accurate and efficient evaluation of the tool-tip FRFs, natural frequencies and mode shapes of TSSH at an arbitrary posture.

Copyright (c) 2018 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In