Edge breakage mechanism of optical glass surface in ultrasonic vibration-assisted milling

Optical glass is an isotropic amorphous solid material; due to its excellent performance, it has been widely used in various fields. However, during the milling process, the optical glass will have defects such as edge break damage and cracks on the surface, import and export, and side edges; these defects seriously affect the application of optical glass. In order to study the formation mechanism of defects such as edge break damage and cracks during optical glass processing and experimental and theoretical study of optical glass milling using ultrasonic vibration-assisted milling (UVAM), the edge break damage depth model of the export edge collapse was established. The results show that the main reason for the edge break damage is that the optical glass will crack on the subsurface during processing; the propagation of these cracks causes the amorphous material to tear and crumble. By comparing and analyzing the results of ultrasonic vibration milling and ordinary milling, ultrasonic vibration can significantly reduce this phenomenon, and it is found that the cutting depth and feed per tooth have a great influence on the export edge break damage value, and the influence of spindle speed is less. In addition, when the amplitude of the ultrasonic wave is applied, not only the import and export edge break damage phenomenon can be significantly improved, but also the surface quality can be significantly improved. Therefore, the application of ultrasonic vibration-assisted milling to the processing of optical glass can improve the surface and edge quality, which is help improve the application range of optical glass.