Abstract
The non-repetitive run-out(NRRO) of ball bearing critically influences the rotational accuracy of a machine tool. The quality of manufacturing can be improved by reducing the value of NRRO. This article developed a new ball bearing measuring system to investigate the NRRO caused geometrical errors of the bearing parts include inner and outer races and balls. The characteristic of the proposed measuring system as follows:(1) A high-precision hydrostatic spindle is applied to drive the inner race of the test bearing to obtain the system accuracy; (2) Measurable and variable axial preload is adopted to simulate the operating condition of bearings; (3) A 2 degrees of freedom flexure hinge mechanism (2-DOF FHM) is used to prevent the outer race from rotating; (4) Two capacitive sensors are used to measure radial error of the test bearing to ensure nano resolution.
Highlights
Rolling element bearing is the most common part used to support the rotational shaft, the rotational accuracy of which influences the performance of the mechanical system [1]
This paper develops a measuring system for the non-repetitive run-out (NRRO) of ball bearings
The system mainly consists of high-precision and high-stiffness reference spindle, 2 degrees of freedom flexure hinge mechanism (2-DOF FHM), air cylinder, nano-resolution displacement sensors and data acquisition (DAQ) software and so on
Summary
Rolling element bearing is the most common part used to support the rotational shaft, the rotational accuracy of which influences the performance of the mechanical system [1]. The corresponding measuring system is developed to investigate the performance of angular contact ball bearings. Asynchronous error motion is the portion of total error motion that occurs at frequencies other than integer multiples of the rotation frequency. Eric et al develops a bearing measuring system by using air bearing reference spindle [5] They ignore the influence of the torque arm on the radial error motion. Yang et al develop a bearing analyzer by applying non-contact preload force, but they ignore the influence of the friction torque inside the test bearing [6]. This paper aims to develop a measuring system to investigate NRRO of ball bearings by simulating the operating condition, including different axial preload forces and rotational speeds
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