Freeform active mirror designed for additive manufacturing
Freeform active mirror designed for additive manufacturing
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专为增材制造而设计的自由曲面主动镜
DOI：
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
Bart van de Vorst
中科院分区：
文献类型：
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作者：
Szigfrid Farkas;T. Agócs;C. Atkins;L. Brouwers;Joris Dufils;András Joó;G. Mező;K. Morris;M. Rodenhuis;M. Roulet;H. Schnetler;Robert Snell;F. Tenegi;A. Vega;Bart van de Vorst
对于建造下一代40米级望远镜所带来的挑战，一个可能的答案是FAME（自由形式主动反射镜实验）的案例研究。由于新仪器的体积和复杂性通常都会增加，因此使用高度非球面的自由曲面可能是一个很好的解决方案，因为这些系统由更少的部件组成，并且可以实现更高的性能。FAME的想法是创建一个薄的面板，然后利用安装在镜子背面并平行于光学表面作用的致动器将其变形为标称形状。FAME原型的测试阶段揭示了设计的复杂性及其对制造和组装过程的敏感性。作为表征的一部分，很难正确预测系统的行为，这是由于致动器和面板之间的几个接口。这些经验导致了一种新结构的开发，该结构消除了从相互安装的各种组件中获得的严格公差链。这也意味着传统制造技术的设计应该落后，必须引入增材制造。本文简要概述了从以前的开发中吸取的经验教训如何与使用拓扑优化，金属增材制造和3D打印零件后处理的相同部件的新设计方法相匹配。这项工作由OPTICON H2020 INFRAIA-2016-2017/H2020-INFRAIA-2016-1资助协议730890资助。
A possible answer to the challenge brought by the construction of the next generation 40 m-class telescopes was the case study of FAME (Freeform Active Mirror Experiment). As the new instruments typically increased in both volume and complexity, the use of highly aspherical freeform surfaces could be a great solution as these systems are built up from fewer parts and can achieve higher performance. The idea of FAME was to create a thin face sheet which is then deformed to the nominal shape utilizing actuators mounted on the back of the mirror and acting parallel to the optical surface. The test phase of the FAME prototype revealed the complexity of the design and its sensitivity to manufacturing and assembly processes. As part of the characterization it was very difficult to predict correctly how the system behaves which is due to the several interfaces between the actuators and the face sheet. These experiences led to the development of a new structure that eliminates the strict tolerance chain obtained from a variety of components mounted on one another. It also means that the design for conventional manufacturing technologies should be left behind, and additive manufacturing must be introduced. This paper gives a brief overview how the lessons learned from the previous development is matched with the new design approach of the same component using topology optimization, additive manufacturing of metals and post processing of 3D printed parts. This work is funded under the OPTICON H2020 INFRAIA-2016-2017/H2020-INFRAIA-2016-1 Grant Agreement 730890.