等速万向节运动灵敏度的试验分析

The systematical static and dynamic property tests of transmission shaft unit assemblage of constantvelocity universal joint for "Red Flag" car were carried out on the comprehensive property testing machine for universal joints. The general law of motional sensitivity of constantvelocity universal joint is explored as follows: the static and dynamic bending moment and rotative moment are directly proportional to its angular rotation; the angular rotation at the sliding end of universal joint is directly proportional to its axial displacement;the relation curve between the static and dynamic sliding force at the sliding end of universal joint and its axial displacement is elliptical; the motional sensitivity of constantvelocity universal joint relates to structure dimension and manufacturing

几何误差贡献值影响下五轴数控机床运动轴误差灵敏度分析方法

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。