Loading...

Vibration Analysis of Tool, Tool Holder and Spindle Interface

Rezai, Mohammad Mahdi | 2009

646 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 39330 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Ahmadian, Mohammad Taghi; Movahhedy, Mohammad Reza
  7. Abstract:
  8. Investigation stability of chatter vibration is of great importance in machining processes. Finding frequency response function (FRF) at the tool tip is an effective method to predict stable machining regions. Commonly, the tool tip FRF is obtained using experimental modal analysis but this approach is often time consuming and requires expertise. In addition, changing tool or holder requires modal test which is a disadvantage, consequently modeling methods are of interest for researchers. Moreover, optimum design of machine tool is another benefit of modeling method. Also, in machining with flexible or micro tools in which experimental tests can not be performed, modeling methods would be the only alternative. Recently, the receptance coupling substructure analysis (RCSA) is used to obtain the tool tip FRF. In this method, the FRF of machine structure is obtained through experimental modal analysis and is combined with the FRF of the tool-tool holder from FE model by receptance coupling. The combined response constitutes the total machine FRF at the tool tip. In this approach, modeling of spindle-holder-tool connections is the main challenge.
    In the present study, a new contact model is presented for holder-tool cylindrical connection and spindle-holder taper connection. To model the structure of tool and holder, a new conical super element is developed in conjunction with the cylindrical super element. Applying these super elements results in more accuracy and less running time. The presented contact model is a unique 3D model in which the contact forces are implemented through a set of springs-dampers. Contrary to previous models, contact parameters are obtained directly with no additional experimental data. To validate the presented contact model, results of static and dynamic analysis are compared with those from commercial finite element software ANSYS. Finally, the effects of contact condition and tool length are investigated
  9. Keywords:
  10. Frequency Response ; Spindle ; Tools ; Contact Problem ; Super Elements ; Vibrational Analysis ; Tool Holder

 Digital Object List

 Bookmark

No TOC