Tribological Behavior of Ni-based Self-lubricating Composites with the Addition of Ti_3SiC_2 and Ag_2W_2O_7

The tribological properties of Nickel-based composites containing Ti_3 SiC_2 and Ag_2 W_2 O_7 fabricated by spark plasma sintering against Si_3 N_4 balls were investigated using a ball-on-disk tribometer from room temperature to 600 ℃. The tribolayers formed on the friction surface and their effects on the tribological properties of composites at different temperatures were discussed based on the worn surface characterization. The results show that Ag_2 W_2 O_7 is decomposed into metallic silver and CrWO_4 during the high-temperature fabrication process. The composite with the addition of 20 wt% Ti_3 SiC_2 and 5 wt% Ag_2 W_2 O_7 exhibits a friction coefficient of 0.33-0.49 and a wear rate of 7.07×10~(-5)-9.89×10~(-5) mm~3/(Nm) over a wide temperature range from room temperature to 600 ℃. The excellent tribological properties at a wide temperature range are attributed to the formation of a glaze layer at low temperature and a tribooxide layer at high temperature, which can provide a low shearing strength for the synergistic effects of Ag and tribooxides.     

活齿端面谐波齿轮移动副受力及接触型式研究

为了对活齿端面谐波齿轮传动装置移动副的受力状态进行分析,首先根据活齿端面谐波齿轮传动装置结构的几何关系,讨论了活齿与槽轮导槽移动副的接触型式,然后根据不同的接触型式对活齿进行了受力分析,同时得出了移动副的效率计算公式。研究结果表明,活齿的不同受力状态对移动副的使用寿命和传动精度有较大影响,从而为活齿端面谐波齿轮移动副的优化设计奠定了基础。     

活齿端面谐波齿轮移动副的运动参数

活齿端面谐波齿轮是一种新型的传动机构，可以从根本上克服径向谐波齿轮传动中柔轮的变形与其承载能力之间的矛盾，能够大幅度地提高所传递的功率。文中根据活齿端面谐波齿轮啮合副修形后的齿面方程，分析了活齿在波发生器端面凸轮一个波上的运动状态，得出了活齿在修形段和未修形段的位移、速度和加速度的计算公式，为活齿端面谐波齿轮的运动参数设计与研究提供了理论依据。     

关于上肢康复机器人机构参数的研究

本文在对上肢康复机器人的使用要求分析基础上,对其训练动作、机构自由度、运动参数和设计方案进行了研究,为上肢康复机器人的产品设计打下了基础。     

活齿端面谐波齿轮移动副受力状态的研究

活齿端面谐波齿轮是一种新型的传动机构，可以在保留现有谐波齿轮传动所有优点的基础上，大幅度地提高所传递的功率。文中分析了活齿端面谐波齿轮传动装置中活齿与槽轮导槽移动副的受力状态，求出了单齿传动时活齿与槽轮导槽移动副单面接触受力的结构条件，为活齿端面谐波齿轮移动副的结构设计提供了理论依据。