Smooth toolpath interpolation for a 5-axis hybrid machine tool

摘要

Due to the merits of high rigidity and good dynamics, hybrid machine tools have been gradually applied to efficientmachining of thin-walled workpiece with complex geometries. However, the discontinuity of tangential componentof toolpath in hybrid machine tools may cause velocity fluctuations, leading to poor surface quality of workpiece. Inthis paper, a novel 5-axis hybrid machine tool is taken as an example to demonstrate a smooth toolpath interpolationmethod. First, an adaptive acceleration and deceleration control algorithm is presented to realize the smooth transitionbetween two constrained velocity points. Second, a spline curve-based interpolation algorithm is proposedto realize the smoothness of the trajectory. Meanwhile, a parameter synchronization method is proposed to ensurethe synchronization of the interpolated tool-axis vector and the interpolated tool tip. Thirdly, an inverse kinematicanalysis is conducted based on an inverse position solution model and a velocity mapping model. Finally, a set ofmachining tests on S-shape workpiece in line with the ISO standard is carried out to verify the effectiveness of theproposed smooth toolpath interpolation method.