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3. Vibration-related mechanisms
It is possible to highlight a number of characteristic behaviours, which we illustrate here mainly for milling.
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Negligible vibration
The tool path is precisely followed by the machine, and only the marks of the passage of the spaced teeth from the feed to the programmed tooth can be seen on the machined surface (figure 10 a).
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Vibrations in phase with tooth impact
When the rigidity of the machine-tool-workpiece system is insufficient, the cutting force undergoes periodic variations, creating noticeable vibrations, known as forced vibrations.
As these vibrations are, to a first approximation,...
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Vibration-related mechanisms
Simple mechanical model of the grazing phenomenon
Bibliography
Digital media
Videos
Vibrations during thin-wall machining :
Machining vibrations during turning (continuous cutting) :
Vibrations during HSM machining...
Websites
Machining vibrations :
http://fr.wikipedia.org/wiki/Vibrations_d%27usinage
Machining thin walls :
http://fr.wikipedia.org/wiki/Usinage_de_paroi_mince
Vibraction (author's...
Software tools
Harmonizer :
CutPro and MachPro :
Production Module :
...Events
Industrie trade fairs (Paris or Lyon, alternately): new machining products are presented ( http://www.industrie-expo.com )
Conference proceedings
INTERCUT/MUGV/Manufacturing'21
Conferences that bring together industrialists and academics in a pragmatic way.
Standards and norms
- Cutting tool operating range – Tool-material pairing; The "pairing" method – tool – material" is presented, enabling you to methodically identify the most productive machining conditions for machining a given material with a given tool. The key idea is to measure the cutting forces at different speeds and engagements, and thus identify different operating regimes. - NF E66-520 - 1997, 1999, 2000
- Mechanical vibration...
Regulations
European Directive 89/392 (1989) and associated French decrees.
These regulations define acceptable noise limits and the actions to be taken to protect operators.
Patents
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Tools with variable pitch, variable helix or special shapes to reduce vibration:
WO 2009124851, Sandvik, 2009, End mill with varying helix angles.
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Tool holders with active damping :
EP1677932B1, TEENESS, 2008, Arrangement for damping of vibrations in a tool holder.
There...
Research laboratories (very short list)
Manufacturing Automation Laboratory, University of British Columbia, Vancouvert, Canada
IDEKO, IK4 Research Alliance, Elgoibar, Spain
Arts et Métiers ParisTech, Paris
LaBoMaP, Ensam, Cluny
École Centrale, Nantes
ENIT, Tarbes
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