并联坐标测量机的结构优化  

Structure optimization of parallel CMM

作　　者：李松原[1] 胡鹏浩[1] 

机构地区：[1]合肥工业大学仪器科学与光电工程学院,安徽合肥230009

出　　处：《光学精密工程》2013年第11期2852-2859,共8页Optics and Precision Engineering

基　　金：国家自然科学基金资助项目(No.51175140)

摘　　要：基于3-PUU并联机构原理,提出一种只需一根光栅,一对精密导轨即可实现三维空间精密测量的坐标测量机。在研制的第一台被动运动型样机的基础上,对其结构参数进行优化设计并重新研制了一款主动运动型样机。首先,依据正解运动学模型和测量空间最大化原则确定了主要部件的尺寸和位置参数;然后,对铰链的位姿进行重新设计和布置,以保证仪器的测量空间。最后,根据测量机的运动特性和参数,对其关键部件的形变进行分析计算,以便控制和减小形变对仪器精度的影响。与第一台样机相比,新样机的测量空间达到了1 050mm×535mm×426mm,在x、y、z方向上测量范围分别扩大了92%、134%和113%;样机的力学性能进一步得到了提高。A novel style Coordinate Measuring System（CMM） based on the 3-PUU parallel mechanism was proposed to realize 3D measurement with only one linear grating and two precision guides. On the basis of a previous prototype with passive motion, a prototype with active motion was re-designed af- ter optimizing the structure parameters of the previous prototype. Firstly, dimensions and positional parameters of main components were decided by the 6-bar direct kinematics model and the principle of maximum measuring space. Then, by re-designing and arranging the pose of each joint, the meas- uring space of CMM was ensured. Finally, according to the motion characteristics and parameters of the designed CMM prototype, the deformation of key components was processed by Finite Element A- nalysis （FEA） to control and decease the affect of deformation on the precision of the CMM. As com- pared with the previous prototype, the proposed design has a measuring space of 1 050 mm×535 mm ×426 mm,which enlarges the measuring space 92% in x axis, 134% in y axis, 113% in z axis, re- spectively, and its mechanical properties can be improved greatly.

关 键 词：并联机构 坐标测量机 结构设计 有限元分析 

分 类 号：TH721[机械工程—仪器科学与技术]