Tuned Mass Damper (TMD)
The TMDs (Tuned Mass Dampers) are tuned to the natural frequency of the tools with the purpose to mitigate the effect of chatter vibration in machining with tool holders with larger length-to-diameter ratio. The use of TMDs has been proven effective in reducing vibrations by absorbing and dissipating energy at critical frequency, thereby improving the dynamic stability of the machining system.
VibraCoat damped shim
The VibraCoat damping mechanism has the purpose to control the machining process by effectively eliminating the high frequency micro-vibration of the cutting insert-shim dynamic system which trigger fatigue damage of the material and causes cutting insert failures, limited-service life of the insert, and poor surface quality of machined parts.
VibraCoat damped shim frequency response
Experimental set-up for longitudinal turning operation (a). The location of the acceleration sensor on the back side of the tool holder. (note the upside down position of the toolholder) (b).
Acceleration signal recorded after 15’ machining with conventional shim (red) and with damped shim (green) respectively.
(a)
(b)
Flank wear of the insert equipped with conventional shim after 15’ machining (a), flank wear of the insert equipped with damped shim after 15’ machining (b).
Plasmatrix in HiPPOCAMP
In HiPPOCAMP project, Plasmatrix discovered the bridge between material's mechanical properties and nano structures..
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