滚柱导轨副预紧拖动力与静刚度关联性研究

Relation between Friction Force and Static Stiffness of Roller Guide

基于预加载的滚柱导轨副力学分析,利用Hertz接触理论,建立预紧拖动力和滚柱过盈量的关系式以及垂直静刚度和滚柱过盈量的关系式,推导出预紧拖动力与垂直静刚度的关联性模型,分别对单根导轨不同位置及同批次多根导轨的预紧拖动力和垂直静刚度进行测量。试验结果表明:无外载荷、无润滑、无密封圈时的导轨副预紧拖动力与20%额定动载荷下的静刚度呈正相关,验证了理论模型的正确性,可利用该模型通过预紧拖动力对其静刚度进行预测计算。

Based on the mechanical analysis of pre-loaded roller linear guide and Hertz contact theory, the relationship between friction force and interference of roller as well as the relationship between vertical static stiffness and interference of roller were established. Then the relation between friction force and vertical static stiffness was deduced. The friction force and vertical static stiffness of single roller linear guide at different sections and of multiple roller linear guides in the same batch were measured. The test result shows a positive correlation between friction force under no external load, no lubrication or sealing ring, and static stiffness under 20% rated dynamic load. The theoretical relation between friction force and static stiffness is verified. With the theoretical relation, the vertical static stiffness may be predicted by the friction force.