关键词: 机械制造工艺与设备 , 机床 , 虚拟轴 , 并联机构 , 几何 , 刚度 , 优化 , 设计

Abstract: Increasing the mechanism stiffness of the virtual-axis hexapod machine is an important fac?tor to improve machining and controlling precision. A geometric optimization method for the parallel machine was presented. The mechanism stiffness model was established and the instantaneous elastic characteristics were analyzed by the model during machining process in consideration of the effect of the changes in mechanism geometric and loading conditions on the total stiffness. Machining process simulations were carried out under a variety of constraint conditions. The cutter deviations from tool?ing paths were calculated, and the optimal geometric parameters for the mechanism with the maximum rigidity on the cutter end were obtained, so that positioning and machining accuracy could be im?proved .As a result, this research provides a simple and effective geometric methodology for mecha?nism design and geometric parameter determination for the virtual-axis hexapod machine.

Key words: manufacturing process and equipment , machine tool , virtual axis , parallel mechanism , geometry , stiffness , optimization , design