Dynamic Analysis and Design of Steel-Ball Grinding Machines Based on No-Slip Cases
Based on no-slip cases between steel balls and lapping discs while a horizontal grinding machine is working, the motion equations of the ball lapping are established and the law of motion is revealed by the MATLAB software. This paper shows that the difference of the trace spacing is reduced by increasing the disc diameter, which can make the trace distribution of the steel ball surface more uniform. In order that balls do not slip when rotary disc drives them to rotate, the ranges of the lapping pressure and lapping disc speed is deduced by using the dynamics analysis considering from the vertical trench surface and along the groove surface, respectively. Finally, this paper takes the selected material as an example to analyze the process parameters that affect the lapping curves, and explains the selection principles of alpha and beta when the trench has some bias, which can provide a reference to improve the quality of the steel balls surface.
Sound and Vibration in Rolling Bearings
Progress in information technology devices and the proliferation of these devices throughout the world have occurred at an astonishingly rapid pace. Not only have there been remarkable improvements in computers, automobiles and electric home appliances, but the total number of such products owned and used by people has increased dramatically. In the midst of such advancement, demand has grown for rolling bearings with lower vibration and noise. In response, extensive research and development has been undertaken at NSK. This report summarizes some of the key findings accumulated from research on sound and vibration in bearings, and discusses vibration modes of bearing rings. In addition, a useful table summarizing sound and vibration in bearings is included as a convenient reference tool for the reader.
STUDY OF THE VIBRATION CHARACTERISTICS OF BEARINGS.
Abstract : Airborne noise and structure borne vibrations of 6310 size bearings were investigated on the bearing vibration tester for bearings with 25 to 100 mm bore. The relationships between amplitude and speed and between airborne noise and structure borne vibrations are shown. Structure borne vibrations and airborne noise measured in absolute units, (microinches/second velocity and absolute acoustical decibels of 6305 and 6310 size bearings are compared. The effect of housing mass on bearing frequencies is displayed. A discussion of the results is given.