大口径传输反射镜在装配紧固力下的面形误差分析  

Surface Error Analysis of Large Reflecting Mirror under Assembly Fastening Forces

作　　者：李桂华[1] 王辉[2] 熊召[3] 高亮[1] 曹庭分[3] 周海[3] 

机构地区：[1]华中科技大学数字制造与装备技术国家重点实验室,武汉430074 [2]清华大学,北京100084 [3]中国工程物理研究院,绵阳621900

出　　处：《中国机械工程》2015年第9期1173-1178,共6页China Mechanical Engineering

摘　　要：400mm级通光口径的大型传输反射镜是我国在建的高功率固体激光装置中的关键部件,反射镜的面形精度对最终的激光打靶精度有直接影响。针对反射镜所采用的螺纹紧固型装配固定方式,通过结构有限元分析和波面拟合方法研究了理论螺纹紧固力和反射镜面形变化定量作用规律。考虑零部件的制造误差、材料以及人为操作等变化因素的影响,实际中各个螺钉的紧固力在一定范围内呈随机分布,基于蒙特卡罗模拟仿真方法研究了实际螺钉紧固力的不确定性对反射镜面面形精度的影响,得出了满足面形精度要求的临界紧固力大小,为现场反射镜装配工艺的校准和优化提供了理论借鉴。Abstrct：In China’s high power solid laser facility,precision mounting of 400 mm class large re-flecting mirror is very important for the final targeting accuracy of laser beams.Considering that the reflecting mirror was mounted with screws array,the mathematical relationship among nominal fas-tening forces and the reflector surface deformation was studied with FEM method and wavefront poly-nomial methodologies.Furthermore,taking some real world factors such as,manfuactring errors, material properties and manual operations-into account,there was a random distribution within a wide range for real fastening forces even under same tightening torque.So a Monte-Carlo simulation meth-od was proposed to predicate the impact of the uncertain fastening forces on the reflector’s surface de-formation.Additionally,the force limitation was also obtained to control the surface deformation, which can be used to guide practical reflector precsion assembly.

关 键 词：大口径反射镜 装配 面形精度 蒙特卡罗仿真 

分 类 号：TH16[机械工程—机械制造及自动化]