MgF_2红外材料的磁流变抛光性能实验及分析

Study of the capability of magnetorheological finishing on MgF_2 materials

MgF2材料随着其热压成型及化学气相沉积(CVD)技术的成熟,凭借其优良的红外透射及机械性能,成为最有代表性的红外光学材料。该材料制成的高陡度非球面红外光学元件的发展给制造加工技术带来众多挑战。MgF2材料磁流变抛光性能的研究对于探索高陡度元件的凹面抛光难题具有重要意义,结合磁流变抛光技术,对MgF2材料的抛光性能展开实验研究,与K9玻璃的抛光特性做对比,分析并优化其磁流变抛光工艺参数,证实磁流变抛光对MgF2材料的有效性,并获得了4.5μm/m in的抛光效率。

MgF2 plays the leading role in infra-red materials. The deep aspheric components made from polycrystalline MgF2 bring huge fabrication challenges. Studied the capabihty of Magnetorheological Finishing（MRF） on MgF2 material to obtain proper parameters of the process. Optimized parameters indicated that MRF can be an effective way to pohshing polyerystalline MgF2. A self-designed MRF process with rotational symmetry removal character was applied to the MgF2 test-piece. The removal rate of 4. 5 μm/min was achieved.