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

在本研究中，提出了一种新的非牛顿子孔径抛光工艺，以实现非接触模式下超光滑表面的确定性抛光。模拟结果表明，主应力与去除率之间存在较强的相关性。实验和比较表明，复合浆料（淀粉和聚合物混合）在获得具有光学质量的无划痕表面方面具有独特的性能。与一般的阀盖抛光相比，该方法获得了无划痕表面。最后，实现了自由曲面双正弦曲面的子孔径抛光。

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.