Five-axis machining is commonly used for complicated features due to its advantage of rotary movement. However, the rotary movement introduces nonlinear terms in the kinematic transform. The nonlinear terms are related to the distance between the cutter location (CL) data and the intersection of the two rotary axes. This research studied the possible setup positions after the toolpaths have been generated, and the objective was to determine the optimal setup position of a workpiece with minimal axial movements to reduce the machining time. We derived the kinematic transform for each type of five-axis machines, and then, defined an optimization problem that described the relationship between the workpiece setup position and the pseudo-distance of the axial movements. Eventually, an optimization algorithm was proposed to search for the optimal workpiece setup position within the machinable domain, which is already concerned with over-traveling and machine interference problems. In the end, we verified the optimal results with a case study with a channel feature, which was real cutting on a table-table type five-axis machine. The results show that we can save the axial movements up to 16.76% and the machining time up to 10.70% by setting up the part at the optimal position.

由于具有旋转运动的优势，五轴加工通常用于复杂的特征。但是，旋转运动在运动学变换中引入了非线性项。非线性项与刀具位置（CL）数据和两个旋转轴的交点之间的距离有关。这项研究研究了在生成刀具路径后可能的设置位置，目的是确定具有最小轴向运动的工件的最佳设置位置，以减少加工时间。我们推导了每种类型的五轴机床的运动学变换，然后定义了一个优化问题，该问题描述了工件设置位置与轴向运动的伪距之间的关系。最终，提出了一种优化算法来搜索可加工域内的最佳工件设置位置，该算法已经涉及到超程和机器干扰问题。最后，我们通过具有通道功能的案例研究验证了最佳结果，该功能是在台式台式五轴机床上进行的真正切割。结果表明，通过将零件设置在最佳位置，我们可以节省多达16.76％的轴向运动和多达10.70％的加工时间。