Abstract
A new laser machine has been developed to improve the accuracy of trajectory. In this machine, an original numerical control unit that compensates the non-linear dynamic characteristics of the laser machine is equipped based on new compensation method so that the laser head corresponds to the high speed machining with enough accuracy. Because the parameters of dynamic characteristics change during motion depending on position, the conventional control method by inverse transfer function is not able to adapt at ordinary way. Two methods are proposed to accomplish an improvement of the accuracy of trajectory to coop with these problems. In the first method, parameters are calculated previously as a function of position from the synthesized transfer functions, and in the second method, these are obtained by real-time calculation during motion for the lather head travel as the second order regression functions of position of the laser head travel. Experimental control results showed the considerable improvement of the accuracy of trajectory, settling time and suppression of vibration of the laser machine at the corner cutting.
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