共查询到19条相似文献,搜索用时 93 毫秒
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针对现有误差元素灵敏度分析与后续误差补偿关联性不强的问题,建立运动轴几何误差贡献值模型并提出运动轴几何误差灵敏度分析方法,以获得本身几何误差对机床精度有很大影响的关键运动轴。结合指数积理论和坐标系微分运动理论建立基于误差敏感矩阵的运动轴几何误差贡献值模型,各运动轴几何误差贡献值相加得到机床综合误差模型;计算各运动轴误差权重分量和误差综合权重实现运动轴误差灵敏度分析,选择误差综合权重平均值最大的运动轴为机床关键运动轴,并对关键运动轴的误差补偿方法进行分析讨论。最后,在北京精雕集团的五轴加工中心上进行仿真实验验证。研究结果表明:所建立模型和所提出分析方法是有效的,且只补偿关键运动轴的几何误差贡献值能有效地提高五轴机床加工精度。 相似文献
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用于精度分配的数控机床误差建模 总被引:1,自引:0,他引:1
以多体系统运动学理论为基础,结合ZK7640三坐标立式钻铣床,提出综合几何误差概念,给出了全面、简便、包含所有误差的空间误差模型.对模型分析并类比传统尺寸链理论提出了综合尺寸链的概念.利用该模型,可以根据整体精度反推零部件精度,实现精度分配. 相似文献
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介绍了利用球杆仪测试和辨识数控机床几何精度的方法,在精确掌握三坐标数控机床几何误差的基础上,通过建立三轴数控机床的几何误差模型,利用误差综合补偿软件进行了补偿实验.结果表明,机床的各项误差都有所降低. 相似文献
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Kinematic calibration of gantry hybrid machine tool based on estimation error and local measurement information 总被引:1,自引:0,他引:1
Xiaoqiang Tang Jinsong Wang Men Gao 《The International Journal of Advanced Manufacturing Technology》2005,26(4):382-390
This paper presents the kinematic calibration of a four degrees-of-freedom (DOF) hybrid machine tool based on a novel planar 3-DOFs parallel mechanism and a long movement of the worktable. Closed-form solutions are developed for both the inverse and direct kinematics about the parallel mechanism. The error model is built and the mechanism accuracy is investigated. Two types of kinematic calibration method are proposed by a simple measurement device. The first type of calibration method is based on estimation error, and can easy improve the machine tool accuracy quickly by estimating the error trends. The second type of kinematic calibration method is based on local measurement information, which includes the position errors and does not include the pose errors of the machine tool. The calibration tests showed the effectiveness of the calibration methods, which can be useful for the similar types of parallel machine tool. 相似文献
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Jun Wu Jinsong Wang Tiemin Li Liping Wang 《The International Journal of Advanced Manufacturing Technology》2007,34(3-4):413-420
This paper focuses on the dynamic characteristics of the two degree-of-freedom (DOF) planar parallel manipulator of a heavy
duty hybrid machine tool. The Newton-Euler approach is employed to derive the inverse dynamic equation of the parallel manipulator.
According to the motion planning of the cutting tool, dynamic simulation without cutting force is performed, and the ratio
of the masses of counterweights to that of moving parts (not including the counterweight) is optimized. It demonstrates that
the manipulator which is designed with over constraint can improve the dynamic behaviour. Furthermore, the cutting force model
for face milling is introduced and the dynamic simulation with the dynamic cutting force is carried out. Simulation shows
that the oscillation of cutting force is one cause of the vibration of the machine tool in the milling process. In the detailed
design, some modification in the structure of the machine tool is made to suppress the vibration. 相似文献
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机床出现爬行时,将严重影响加工工件表面质量、表面粗糙度及定位精度,甚至还会影响机床零件的使用寿命,缩短刀具的使用寿命。机床导轨爬行严重时,可导致机床丧失加工能力。主要分析了数控机床爬行的原因及其对策。 相似文献