Diagnostic of peripheral longitudinal grinding by using acoustic emission signal

Abstract

Grinding burn is one of the well-known problems in grinding processes. The phenomenon of burns causes permanent damage to the ground surface. Therefore, there is a need of monitoring the grinding processes in order to prevent surface damage of a workpiece. This paper presents a method of diagnosing grinding wheel wear with the use of acoustic emission signal gen-erated during grinding. The method aims to detect the occurrence of burn in the surface layer of ground workpieces, and, thus, to replace costly and trou-blesome surface layer control methods performed after grinding. Experi-mental research of the grinding process together with the control of surface layer condition was conducted by means of the nital etching method. A band analysis of acoustic emission signal was completed and the influence of the grinding burns phenomenon on the signal amplitude in the range of low fre-quencies was presented. A boundary value of the AE describing the appear-Ance of grinding burns was determined. Moreover, RMS value of acoustic emission signal was analysed, and the influence of grinding wheel wear on the signal variations was determined. A new parameter was proposed in order to determine the end of grinding wheel life-Time. A boundary value of this AE parameter, which indicates the excessive wear of grinding wheel was deter-mined.