5軸制御マシニングセンタのキャリブレーション方法に関する研究(第2報)

同時3軸制御運動を用いた位置偏差および角度偏差の推定

抄録

Various types of 5-axis controlled machining centers have been developed to produce molds, dies and mechanical parts with complicated shape as well as aero parts. The most fundamental cause of the machining errors is the deviation of the configuration of the machining center. However, any calibration method for the 5-axis machining centers including two rotary axes has not been investigated. In this paper, a calibration method using simultaneous 3-axis control technique is proposed for 5-axis machining centers with a tilting rotary table. The ball-bar system is used as a measurement instrument. In this method, one rotary axis and two linear axes are simultaneously controlled and the sensitive direction of the ball bar system is kept constant in radial, tangential or axial accordingly. The influence of the positional and angular deviations on 3-axis motion is evaluated through the characteristic diagrams. In the experiments, the positional and angular deviations existing in the 5-axis machining center are estimated by the proposed method. The results show that the deviations can be estimated with high accuracy.