球头副曲率半径对力传感器方位误差的影响

Effects on Radius of Curvature of Load Pad on Position Errors of Force Transducer

对不同接触形式的球头副的载荷偏心量和接触应力进行了分析,并设计了9对不同接触形式、不同结构尺寸的球头副进行方位误差测量。实验结果发现,相对于球面球面点接触形式球头副,球面平面点接触形式球头副的方位误差更小,球面球面完全接触形式球头副与球面平面点接触形式球头副的偏心载荷相当;调整角度较小时,可以选用球面球面点接触或球面球面完全接触,调整角度较大时,宜采用球面平面点接触或半径较小的球面球面完全接触。

Load eccentricity and contact stress of load pads with different contact forms were compared. 9 pieces of load pads with different structures were designed and tested.The experimental results show that the position errors of the sphere-plane contact are smaller than that of sphere-sphere point contact.Load eccentricities with sphere-sphere uniform contact and sphere-plane contact are similar. The sphere-sphere point contact and the sphere-sphere uniform contact are suitable for the situations when the angle of adjustment is small.The sphere-plane contact and the sphere-sphere uniform contact with small radius are used if the angle of adjustment is large.