Engineered Grinding Wheels - Precision grinding of optical glasses

精密修整、粗晶、单层金属结合剂金刚石砂轮，具有均匀的磨粒突起高度和扁平的磨粒，适用于光学玻璃的超精密磨削。在BK7和SF57玻璃上的实验表明，切割机制转变为延性去除，可以获得表面粗糙度约为20 nm的光学表面。与通常使用的细粒树脂结合剂金刚石砂轮相比，工程砂轮具有更高的耐磨性。因此，可以显著减少周期性修整周期，经济地应用于大型光学零件的超精密磨削是可行的。因此，工程砂轮是一种替代传统细粒金刚石砂轮的经济和技术选择。然而，要将工程砂轮引入工业应用，还需要澄清更多的基本问题。首先，关于光学玻璃亚表面区域亚表面损伤的产生的知识是一项主要的科学兴趣。此外，还必须确定磨削过程和修整过程引入的金刚石颗粒可能的宏观和微观磨损机制。为了使这些新型金刚石砂轮能够应用于大型玻璃表面的研磨，对研磨玻璃的亚表面区域的分析和对金刚石颗粒磨损机理的了解是必不可少的。

Defined dressed, coarse-grained, single layered, metal bonded diamond grinding wheels, so called Engineered Grinding Wheels, with uniform abrasive grain protrusion heights and flattened grains are suitable for ultra-precision grinding of optical glasses. Experiments on BK7 and SF57 glass show that the cutting mechanisms turn into ductile removal and optical surfaces with surface roughness of about Sa = 20 nm are achievable. Compared with usually used fine-grained, resin-bonded diamond grinding wheels Engineered Grinding Wheels exhibit a high wear resistance. Therefore periodically dressing cycles can be significantly reduced and an economical application of ultra-precision grinding of large optical workpieces is feasible. Thus, Engineered Grinding Wheels are an economic and technological alternative to conventional fine-grained diamond grinding wheels.To introduce Engineered Grinding Wheels in industrial application, however, further basic questions have to be clarified. First, knowledge about the generation of the sub-surface damages in the sub-surface zone of the optical glasses is one major scientific interest. Further, possible macro- and microscopic wear mechanisms of the diamond grains, which are introduced by the grinding process, but also by the conditioning process have to be identified. The analysis of the sub-surface zone of the ground glass and the understanding of the wear mechanisms of the diamond grains are essential in order to enable the application of these novel diamond wheels for grinding of large glass surfaces.