Described is method for reducing vibrations originating in a mechanical processing for removal of swarf comprising monitoring the vibration which results from the contact between the tool (103) and a workpiece (WP) 5 being processed, detecting the occurrence of a regenerative vibratory phenomenon, calculating the frequency of the vibratory phenomenon (fC), estimating a value representing a resonance frequency (fR) of the machine as a function of the frequency of the vibratory phenomenon (fC) and determining at least one threshold value (ωTR) on the basis of the value 10 representing a resonance frequency (fR). The method also comprises comparing the operating speed (ωL) of the mandrel (102) with the threshold value (ωTR) and reducing the intensity of the vibratory phenomenon by the performance of a first reduction strategy (SST) based on a correction of the operating speed (ωL) when the operating speed (ωL) 15 of the mandrel (102) is greater than the threshold value (ωTR) or by means of a second reduction strategy (SSV) based on a continuous modulation which imparts an oscillation to the speed around the value of the operating speed (ωL), when the operating speed (ωL) of the mandrel (102) is less than the threshold value (ωTR).

METHOD AND A SYSTEM FOR REDUCING VIBRATIONS IN A MECHANICAL PROCESSING FOR REMOVAL OF CHIPPINGS

P. Albertelli
2019-01-01

Abstract

Described is method for reducing vibrations originating in a mechanical processing for removal of swarf comprising monitoring the vibration which results from the contact between the tool (103) and a workpiece (WP) 5 being processed, detecting the occurrence of a regenerative vibratory phenomenon, calculating the frequency of the vibratory phenomenon (fC), estimating a value representing a resonance frequency (fR) of the machine as a function of the frequency of the vibratory phenomenon (fC) and determining at least one threshold value (ωTR) on the basis of the value 10 representing a resonance frequency (fR). The method also comprises comparing the operating speed (ωL) of the mandrel (102) with the threshold value (ωTR) and reducing the intensity of the vibratory phenomenon by the performance of a first reduction strategy (SST) based on a correction of the operating speed (ωL) when the operating speed (ωL) 15 of the mandrel (102) is greater than the threshold value (ωTR) or by means of a second reduction strategy (SSV) based on a continuous modulation which imparts an oscillation to the speed around the value of the operating speed (ωL), when the operating speed (ωL) of the mandrel (102) is less than the threshold value (ωTR).
2019
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11311/1118828
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