摘要
In this study, acoustic emission (AE) was adopted to monitor the grinding–polishing process of extra-low dispersion (ED) lens. S-FPL51, a raw material of ED lens, exhibits extraordinary optical properties such as high Abbe numbers and low dispersion. However, processing S-FPL51 is difficult because of its mechanical properties such as low hardness and high wear abrasion, which make the adjustment of the lens thickness difficult, and the lens are scratched easily. Therefore, an AE sensor was employed to monitor the grinding–polishing process because of its high sensitivity to material removal. Furthermore, several experiments were conducted to establish a relation between grinding–polishing parameters, such as pressure, rotating speed, root mean square (RMS) value of AE signals, and material removal rate (MRR). The results indicated that MRR is strongly correlated to the RMS of AE signals. Subsequently, several MRR models were derived based on the experimental data, and an AE signal term was introduced into the modified Preston equation to estimate MRR. Moreover, the results indicated the AE sensor to be a potential tool for monitoring the grinding–polishing process of optical lens.