| 孙永平.G型结构立式镗铣机床位置刚度数值模拟与试验[J].,2013,53(3):364-369 |
| G型结构立式镗铣机床位置刚度数值模拟与试验 |
| Experiment and simulation of position stiffness of a G\|type frame structure vertical machine center |
| |
| DOI：10.7511/dllgxb201303009 |
| 中文关键词: 工作空间 位置刚度 静刚度试验 |
| 英文关键词: work space position stiffness static stiffness test |
| 基金项目:“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) |
|
| 摘要点击次数: 1114 |
| 全文下载次数: 1128 |
| 中文摘要: |
| 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． |
| 英文摘要: |
| The position static stiffness variation of G-type frame structure vertical machine center on work space volume is studied. Based on the feature of joints, the spindle bearings, linear slide-ways and guide screw are equivalent to the springs. The static stiffness prediction model of complete machine is built. The X, Y and Z sensitive direction position stiffnesses of column, table and vertical machine center are calculated using the finite element method. Meanwhile, the static stiffness of vertical machine center is verified by discrete point experiment. 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 nonlinearly decrease in Z travel. The static stiffness of table in X, Y plane is a parabolic shape, the maximum is 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.Research of the stiffness of a G-structure vertical milling machine in different coordinate position of work space has been done. Through the experiment to research the X, Y, Z direction static stiffness of discrete points; Simultaneously, based on the experiment data, used spring equivalent the movable connection of spindle bearing and linear guide-way and ball-screw guide, by which establish the stiffness prediction modal according to the characteristics of the movable connection. Combined with the finite element method, X, Y, Z spatial stiffness in error sensitive directions has been simulated. The analysis results showed that: The maximum error of spatial discrete points data of stiffness and simulation is 8.7%,The X, Y, Z direction stiffness of spindle is no-linear reduce in Z travel, The X, Y, Z direction stiffness of X-table of transform of X axis and Y axis position is in the parabolic to decline, The machine stiffness is similar with the stiffness distribution rule, The data of simulation have been provided theory basis to the design of G-structure vertical milling machine. |
|
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |
|
|
|