Abstract
Compared to conventional serial kinematic machine tools, parallel kinematic machine tools have advantages for high speed and multi-degrees of freedom positioning. However, they cannot simply achieve high speed cutting because of their relatively complex structures. In order to achieve high speed cutting on parallel kinematic machine tools, it becomes important to optimize the tool trajectories and the workpiece position. In this study, the strut motion controlling a spindle unit is simulated while cutting. And external forces, which are gravity, friction and inertia forces, acting each strut are estimated by solving the kinematic model. The tool posture, the feed direction of ball-end milling and the workpiece setup position are evaluated based on the estimated external forces during a cutting operation. Also, an evaluation method of vibrational stiffness is proposed by employing the unit vector of each strut direction obtained from the simulator developed above. The proposal method is validated by the hammering tests in various conditions. It is confirmed that the support system developed in this study can realize to reduce the variation of external forces and the influence of vibration during a cutting operation on a parallel kinematic machine tool.
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