A mechatronic study on a model-based compensation of inertial vibration in a high-speed machine tool

A significant limitation to machine tool productivi ty in high-speed operations is due to inertial vibr ations. During strong accelerations, inertial forces genera te oscillations that are translated into surface ge ometrical errors on the machined parts. Machine tools users m inimize these problems by reducing machine axes quickness, thus affecting productivity. In this pap er the effects of inertial deformations on machine tool accuracy have been studied to evaluate the possibil ity of adopting a software compensation strategy. T he proposed model-based solution, based on a reduced m odel of the machine tool dynamics, has been tested in a mechatronic simulation environment. In order to m eet industrial needs, the compensation scheme has b een designed to allow its implementation on standard nu merical controllers. A detailed feasibility analysi s has been carried out studying all aspects that can potential ly mpede the application of such approach. Simulat ions and some preliminary experimental tests prove the effec tiv ness of the developed technique on a five-axis machining center.

[1]  Steve Douglas,et al.  Adaptronic gantry machine tool with piezoelectric actuator for active error compensation of structural oscillations at the tool centre point , 2008 .

[2]  E. Bautista,et al.  Input shaping reference commands for trajectory following Cartesian machines , 2005 .

[3]  Peter Eberhard,et al.  Adaptronic Vibration Damping for Machine Tools , 2007 .

[4]  R Maj,et al.  Machine Tools Mechatronic Analysis , 2006 .

[5]  Giacomo Bianchi,et al.  Towards Virtual Engineering in Machine Tool Design , 1996 .

[6]  Christian Brecher,et al.  Structure integrated adaptronical systems for machine tools , 2008, Prod. Eng..

[7]  M. Bampton,et al.  Coupling of substructures for dynamic analyses. , 1968 .

[8]  Berend Denkena,et al.  Mechatronic Systems for Machine Tools , 2007 .

[9]  Yusuf Altintas,et al.  High speed CNC system design. Part I: jerk limited trajectory generation and quintic spline interpolation , 2001 .

[10]  Shen Yung Lin,et al.  Improvement strategy for machine tool vibration induced from the movement of a counterweight during machining process , 2008 .

[11]  Christian Brecher,et al.  Controller-integrated predictive oscillation compensation for machine tools with parallel kinematics , 2006 .

[12]  Mikel Zatarain,et al.  New Control Techniques Based on State Space Observers for Improving the Precision and Dynamic Behaviour of Machine Tools , 2005 .

[13]  Jan Swevers,et al.  Gain-scheduling control of machine tools with varying structural flexibility , 2004 .

[14]  Uwe Heisel,et al.  Dynamic Influence on Workpiece Quality in High Speed Milling , 1999 .