摘要
研究G型结构立式镗铣机床工作空间位置刚度随工作空间体积变化规律.根据联接单元特征,将主轴轴承、线性导轨及丝杠等动联接采用弹簧等效;建立整机静刚度预测实体模型;结合有限元方法数值模拟工作台、主轴及整机X、Y、Z误差敏感方向工作空间的位置刚度分布,以离散点试验验证研究立式镗铣机床X、Y、Z三向的静刚度.结果表明:机床离散点试验获得的静刚度数据与数值计算结果最大误差为8.7%,主轴三向静刚度随Z轴行程增加而非线性减小,工作台X、Y轴中间位置三向静刚度最大,呈抛物状向外递减,机床整机静刚度同工作台静刚度呈相似分布规律.数值模拟数据为G型精密机床结构设计及位置误差补偿提供了理论基础.
work space and guide The position static stiffness variation of G-type frame structure vertical machine center on volume is studied. Based on the feature of joints, the spindle bearings, linear slide-ways screw are machine is built. The equ X, ivalent to the springs. The static stiffness prediction model of complete Y and Z sensitive direction position stiffnesses of column, table and vertical machine center are calculated using the finite element method. vertical machine center is verified by discrete point experiment. Meanwhile, the static stiffness of Results show that the maximum relative error of simulation and experiment is 8. 7%, the X, Y and Z sensitive direction static stiffnesses of spindle nonlinearl parabolic shape, the maximum Y is decrease in Z travel. The static stiffness of table in X, Y plane is a in the center, the minimum is in the border. The variation of static stiffness of the complete machine is similar to the table. The data of simulation provide a theory basis for the design of G-type frame structure vertical machine center and position error compensation.
出处
《大连理工大学学报》
EI
CAS
CSCD
北大核心
2013年第3期364-369,共6页
Journal of Dalian University of Technology
基金
"十一五"国家科技支撑计划资助项目(2011BAF11B03)
国家科技重大专项资助项目(2012ZX04010-011)
关键词
工作空间
位置刚度
静刚度试验
work space
position stiffness
static stiffness test
