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A new CNC lathe with a tandem table unit driven by two linear motors has been developed for machining non-axisymmetric curved surfaces by turning. This lathe, which equips 4 axes (X1 X2, Z and C), enables to realize the NACS-turning (Non-Axisymmetric Curved Surfaces Turning) with high speed machining synchronizing with the spindle rotational position. The key factors for this turning method is not only to realize precise tool tracking ability for the commanded position but also to cancel the inertia force caused by the rapid motion with high acceleration and deceleration. Therefore, the dynamic response of each axis is required so that the curved surfaces is machined accurately with the rapid motion, high acceleration, and jerk. In this study, we introduce a new CNC lathe with 4 axes including a tandem table unit that has achieved the acceleration and the deceleration of over 100m/s2 by the use of the tandem linear motors driving system. Each table is controlled synchronizing to obtain the accurate trajectory on the designed curved surface by canceling the inertia force during machining motion. In this report, the fundamental dynamic performance of the table motion of the CNC lathe are measured and evaluated. The effectiveness of suppression of the vibration transmission to the CNC lathe during the motion control for the curved surfaces is also evaluated. 1. はじめに 数値制御工作機械は,要素技術と制御装置の進展に伴い,高精度,高速化を達成し,超精密加工や工程集約型 の複合加工の実現と生産性向上に大きく貢献してきた.現在では 3D-CAD の普及により自由曲面の生成を容易に *1 正員,金沢工業大学(〒924-8501 石川県野々市市扇が丘 7-1) *2 学生員,金沢工業大学大学院 工学研究科 機械工学専攻 *3 高松機械工業(株)(〒924-8558 石川県白山市旭ヶ丘 1-8) *4 正員, 高松機械工業(株) E-mail of corresponding author : mosandb1@neptune.kanazawa-it.ac.jp

nihon kikai gakkai ronbunshu

Development of a CNC lathe with tandem moving table for high speed turning (Evaluation of high-speed motion and effect of vibration transmission suppression)