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Active Chatter Damping in Plunge Grinding Using Magnetic Actuators

[+] Author Affiliations
Markus Ahrens, Matthias Dagen, Tobias Ortmaier

University of Hanover, Hanover, Germany

Ruben Fischer, Berend Denkena

University of Hanover, Garbsen, Germany

Paper No. MSEC2014-4111, pp. V001T04A037; 6 pages
doi:10.1115/MSEC2014-4111
From:
  • ASME 2014 International Manufacturing Science and Engineering Conference collocated with the JSME 2014 International Conference on Materials and Processing and the 42nd North American Manufacturing Research Conference
  • Volume 1: Materials; Micro and Nano Technologies; Properties, Applications and Systems; Sustainable Manufacturing
  • Detroit, Michigan, USA, June 9–13, 2014
  • Conference Sponsors: Manufacturing Engineering Division
  • ISBN: 978-0-7918-4580-6
  • Copyright © 2014 by ASME

abstract

In cylindrical plunge grinding with conventional grinding wheels, self-excited vibrations are one of the most limiting factors in terms of productivity and process stability. Initial vibration related to the dynamic behavior of the workpiece and machine copy on the grinding wheel, causing an increasing waviness due to uneven wear and therefore, an increasing vibration of the workpiece. These self-excited oscillations lead to many expensive true-running cycles in order to ensure high workpiece quality and process stability. In this context, we present an abrasion manipulation system for active vibration control using a self-built magnetic actuator to influence the tool wear and prevent the development of wheel-sided chatter. Estimation of the grinding wheel’s surface waviness has been achieved using a surface model, which parameters are estimated by a recursive-least-square-algorithm (rls), exclusively using data of workpiece movement. Using the estimated tool-surface-signal to predict forces onto the workpiece, it is possible to compensate them by the actuator and impend the development of waves on the wheel’s surface. The concept has been applied to a standardized plunge grinding process demonstrating successful chatter suppression at a former instable process.

Copyright © 2014 by ASME

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