Written by  Erika
Published in News and events

Hippocamp at 66th CIRP GA 2016

Hippocamp has been present at the 66th CIRP General Assembly celebrated in Guimarães from 21st to 27th August 2016. Jokin Muñoa from Ideko presented two keynotes related to Hippocamp project: Chatter Suppression Techniques in Metal Cutting and Design of self-tuneable mass damper for modular fixturing systems. 


Chatter suppression techniques in metal cutting

  • a IK4-Ideko, Dynamics & Control Department, Elgoibar, Basque Country, Spain
  • b Department of Applied Mechanics, Budapest University of Technology and Economics, Budapest, Hungary
  • c Manufacturing Research Laboratory, Sabanci University, Istanbul, Turkey
  • d Manufacturing Automation Laboratory, University of British Columbia, Vancouver, Canada
  • e Laboratory for Machine Tools and Production Engineering (WZL), RWTH Aachen, Germany
 Received 16 March 2016, Revised 10 May 2016, Accepted 1 June 2016, Available online 5 August 2016

The self-excited vibration, called chatter, is one of the main limitations in metal removal processes. Chatter may spoil the surface of the part and can also cause large reduction in the life of the different components of the machine tool including the cutting tool itself. During the last 60 years, several techniques have been proposed to suppress chatter. This keynote paper presents a critical review of the different chatter suppression techniques. Process solutions with design and control approaches are compiled to provide a complete view of the available methods to stabilize the cutting process. The evolution of each technique is described remarking the most important milestones in research and the corresponding industrial application. The selection of the most appropriate technique for each specific chatter problem is also discussed considering various aspects of machining processes.



Design of self-tuneable mass damper for modular fixturing systems

  • a IK4-Ideko, Dynamics and Control, Elgoibar, Basque Country, Spain
  • b IK4-Tekniker, Eibar, Basque Country, Spain
  • c Department of Applied Mechanics, Budapest University of Technology and Economics, Budapest, Hungary
 Available online 14 June 2016

Enhancing dynamic characteristics of fixtures for large workpieces is essential to assure chatter free machining of heavy-duty milling operations. Variable stiffness tuned mass dampers (VSTMD) can effectively improve the dynamic stiffness of modular fixtures by changing their dynamic characteristics. The theory of a new VSTMD concept is presented. Their realisable optimal tuning is determined and the results are compared to the standard constant stiffness TMDs. By means of the developed automatic tuning procedure, stiffness is varied via a rotary spring, while damping is provided by eddy currents. The prototype and the effectiveness of the concept are experimentally validated by heavy-duty milling tests on a modular fixture.




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Last modified on Tuesday, 20 September 2016 11:38
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