In this work, an innovative force control module is presented, which can be employed in CNC end milling machines in order to maintain a constant cutting force in the presence of parametric uncertainty for a time varying end milling process. The controller is a non-time based one; in fact, the desired tool position reference is delayed according to the integral of a proper function related to the on-line cutting force measurement. Such a controller, which is referred to as delayed reference control (DRC), consists in a outer force feedback loop around an inner position feedback loop. Two main advantages make this controller suitable for a commercial diffusion: it avoids complicate and time consuming algorithms for re-planning the path in response to cutting force and it does not require to design a new position feedback loop. Good experimental results are obtained by implementing the controller on a wood milling machine prototype. The system has shown a remarkable robustness in terms of immunity to the mechanical and electrical noise, working properly also with unfiltered control signals.

A non-time based force control system for CNC applications

GALLINA, PAOLO;SCUOR, NICOLA;MOSETTI, GIOVANNI
2004

Abstract

In this work, an innovative force control module is presented, which can be employed in CNC end milling machines in order to maintain a constant cutting force in the presence of parametric uncertainty for a time varying end milling process. The controller is a non-time based one; in fact, the desired tool position reference is delayed according to the integral of a proper function related to the on-line cutting force measurement. Such a controller, which is referred to as delayed reference control (DRC), consists in a outer force feedback loop around an inner position feedback loop. Two main advantages make this controller suitable for a commercial diffusion: it avoids complicate and time consuming algorithms for re-planning the path in response to cutting force and it does not require to design a new position feedback loop. Good experimental results are obtained by implementing the controller on a wood milling machine prototype. The system has shown a remarkable robustness in terms of immunity to the mechanical and electrical noise, working properly also with unfiltered control signals.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11368/2403487
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