Acceleration Feedback

Acceleration Feedback in the SV6000

DINÁMICA Y CONTROL

Chatter vibrations are one of the main factors limiting the productivity of roughing operations in large milling machines. Active dampers have proved their efficiency to increase chatter stability, however these techniques require the installation of a new actuator in the machine.

EL RETO

The main aim of the project is to increase chatter stability with active damping strategies using directly the machine tool feed drives. Indeed, for low frequency structural chatter, the machine drive bandwidth could be large enough to actively damped structural modes.

EL RESULTADO

An Open CNC has been created, which has been implemented on the SV6000 machine, to be able to introduce the feedback from the accelerometer to the velocity set point of the axis controller. Simple simulation models have been developed to understand the theoretical behavior of this new feedback. Then experimental tests have been carried out of the SV6000 machine to measure the effect of the feedback in the Frequency Response Function and during the movements of the machine.
The Open CNC is a good tool to make the first tests but an industrially applicable implementation in under study. To conclude, this project has demonstrated that the concept of acceleration feedback using the machine"s drives can increase the chatter stability.