Investigation of non-Newtonian fluids for ultra-precision sub-aperture polishing

在这项研究中，提出了一种新的非牛顿子孔径抛光工艺，使超光滑表面的非接触模式的确定性抛光。进行建模和模拟，并显示主应力和去除率之间的强相关性。实验和对比表明，采用淀粉和聚合物混合抛光液的新方法在获得无划痕、光学质量良好的表面方面具有独特的性能，与普通的气囊抛光相比，新方法获得了无划痕的表面。最后，实现了自由双正弦曲面的亚孔径抛光。

In this study, a new non-Newtonian sub-aperture polishing process was proposed to enable deterministic polishing of super smooth surfaces in contactless mode. Modelling and simulation were conducted and showed strong correlation between principal stress and removal rate. Experiments and comparisons demonstrated the distinctive performances of the new method with compound slurry (starch and polymer mixed), in obtaining scratch-free surface with optical quality.Scratch free surface is obtained using the new method compared to the generic bonnet polishing. Finally, sub-aperture polishing of a freeform bi-sinusoidal surface was achieved.