Hexapod型パラレルメカニズム工作機械の精度向上に関する研究(第2報) : 絶対座標系上での位置決め誤差を評価するキャリブレーション法

概要

論文の詳細を見る
This paper presents a methodology to calibrate kinematic parameters in a Hexapod-type parallel mechanism machine tool. In a conventional procedure of the DBB (Double Ball Bar) test to measure a machine's contouring accuracy in a circular operation, the center deviation in an error profile is ignored to cancel setup errors. In such a case, the machine's positioning error can be evaluated only locally. We propose to use a specialized jig plate to fix a ball of a DBB device in order to evaluate the machine's positioning error in the global coordinate system. Kinematic parameters in a Hexapod-type parallel mechanism can be calibrated based on contouring error profiles. Experimental comparison shows the machine's global positioning error is significantly improved by using the proposed calibration method. In particular, the parallelity error and the straightness error are reduced by 89% and 76%, respectively, compared to the conventional calibration.
社団法人精密工学会の論文
2004-04-05