Vibration Monitoring of the Internal Centreless Grinding Process Part 1: Mathematical Models

Abstract

The grinding process is complex with many interrelated parameters, and an initially stable process can become unstable as grinding conditions naturally deteriorate. Forced vibration from machine rotating elements and self-excited vibration produce a relative radial movement between the wheel and workpiece during grinding and the wheel and diamond during dressing, causing errors in workpiece finish and form. By monitoring vibration produced during the grinding and wheel dressing operations a measure of expected workpiece quality can be obtained. In order to use vibration monitoring effectively as a means of detecting adverse grinding and dressing conditions it is necessary to gain an insight into the dynamics of the process so that relevant parameters for monitoring are identified. In Part 1 of this paper, with the aid of simple models, the different types of vibration that can occur during the grinding and dressing operations are identified, along with their likely effect on workpiece quality.