Effects of misaligned rails on the friction force–displacement curves of a linear ball bearing system in low-speed operation

Abstract

This paper investigates the effects of misaligned rails on the friction force-displacement curves of a linear ball bearing system (which consists of two sets of deep groove type non-recirculating linear ball bearings, a table and a bed). Experiments showed that the measured friction force-displacement curves, of the linear ball bearing system, with aligned rails were rectangular-shaped hysteresis loops, while the corresponding curves with misaligned rails were trapezoidalshaped hysteresis loops. In addition, the hysteresis loop area increased as the distance between table side rails decreased. Next, calculations for the total friction force expression due to differential slip and elastic hysteresis loss, including the effects of the misaligned rails, are presented. It was confirmed that the calculated total friction force-displacement curves closely matched the measured friction force-displacement curves for both the aligned and misaligned rail cases.

Research on nonlinear static and dynamic characteristics of linear guideway in machine tools considering carriage flexibility

“…Cyclic motion of the rolling element causes friction fluctuations of the linear guideway, which seriously affects its accuracy [15,16]. Miura et al [17] analyzed the effect of the friction fluctuations of the linear guideway on the position deviation of the machine tool drivers, and studied the relation between the ball contact, circulation conditions and friction force.…”