光学玻璃塑性模式超精密磨削加工的研究

利用超精密磨床磨削加工6种典型的光学玻璃，先从理论上研究了脆性材料脆塑转变的临界值，然后对脆性材料作了大量磨削实验，实验结果表明，超精密磨削脆性材料时存在着断裂模式，断裂与塑性模式、塑性模式，这些模式主要由砂轮磨粒的切削深度进行控制，该磨削表面粗糙度与磨粒尺寸的大小，砂轮的进给量及玻璃的材料有关，当光学玻璃在塑性模式磨削时，其表面层不会产生任何裂纹缺陷，利用超精密磨床进行磨削加工，获得的表面粗糙度Ra低于5nm。

Study on Ultra-PrecisionGrinding of Optical Glasses in the Ductile Mode

In this paper, the typical 6 kinds of optical glasses have been grinding by the ultra-precision grinding, brittle-ductile transition's critical depth of brittle materials is researched theoretically. The grinding experiment results show that three modes exist during grinding brittle materials: brittle mode, brittle & ductile mode and ductile mode. Brittle-ductile transition is controlled by depth of cut of grain size of wheels. The surface roughness is related with grain size, feed per wheel revolution and glass material, glasses can be ground in the ductile mode and the surface does not contain a micro-crack under the surface. The surface roughness less than Ra: 5nm and RMS:3nm have been obtained by the ultra-precision grinding.