Removal mechanisms during fluid jet polishing of amorphous materials with diamond particles

金刚石颗粒非晶态材料流体喷射抛光过程中的去除机制

• 批准号: 395811148
• 负责人: Professor Dr.-Ing. Udo Fritsching
• 金额: --
• 依托单位: Abteilung Verfahrenstechnik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/395811148?language=en
• 关键词: Removal; mechanisms; during; fluid; jet

Polishing with an abrasive-laden fluid jet offers various possibilities and advantages for finishing of optical surfaces. By varying the process, challenges like varying material behaviour, required surface roughness and form accuracy can be met. In this regard, diamond particles as abrasives are attested a higher efficiency compared to commonly used abrasives like cerium oxide or SiC. Because of machine tool restrictions a wide testing has not been possible so far. To investigate fluid jet polishing with diamond particles scientifically, it is essential to connect basic experiments with numerical simulations to identify the governing mechanisms. For this research project, a test stand is to be developed, which supplies a steady fluid jet which is loaded with diamond abrasives onto a movable reference surface. Incidents which take place in the jet as well as in the impact zone and drain zone shall be monitored by appropriate metrology systems and correlated to the material removal via the generated surface topography. By means of numerical modeling and simulations the entire fluid motion as well as the behavior of single particles, in interactions with each other as well as with the material, are described and verified with respect to the experimental results. Finally, the basic principles shall be transferred to a real process with the aim to validate the developed models. The scientific challenges of this research project lie in the identification of the fundamental mechanisms, which dominate the material removal, and the revelationof the influence of the parameters on these mechanisms. Furthermore, the choice of methods for the numerical simulations and the consideration of process inherent boundary conditions are of highest priority for modeling the process true to the real conditions to understand the principle incidents on the smallest scale.

使用含磨料的流体射流进行抛光为光学表面的精加工提供了多种可能性和优势。通过改变工艺，可以应对不同的材料行为、所需的表面粗糙度和形状精度等挑战。在这方面，与常用的磨料（如氧化铈或碳化硅）相比，金刚石颗粒作为磨料被证明具有更高的效率。由于机床的限制，迄今为止还无法进行广泛的测试。为了科学地研究金刚石颗粒的流体喷射抛光，必须将基础实验与数值模拟结合起来以确定其控制机制。对于该研究项目，将开发一个测试台，该测试台提供稳定的流体射流，将金刚石磨料装载到可移动的参考表面上。发生在射流以及冲击区和排放区的事故应通过适当的计量系统进行监测，并通过生成的表面形貌与材料去除相关联。通过数值建模和模拟，描述了整个流体运动以及单个颗粒之间以及与材料相互作用的行为，并根据实验结果进行了验证。最后，基本原理应转移到实际过程中，以验证所开发的模型。该研究项目的科学挑战在于确定主导材料去除的基本机制，并揭示参数对这些机制的影响。此外，数值模拟方法的选择和过程固有边界条件的考虑对于真实条件下的过程建模以了解最小规模的主要事件而言是最重要的。