摘要
离心熔铸技术在大口径非球面镜镜胚的制造方面具有独特优势。本文通过自行研制的缩比模型实验机进行试验,深入研究了离心熔铸工艺及成型镜胚质量,详细介绍了模具涂层的制备、离心熔铸的加热及冷却等工艺过程,制备了非球面镜镜胚模型。采用数值模拟与试验研究相结合的方法,对所得镜胚面形偏差工艺参数的敏感性进行了研究。分析了模具的热膨胀系数、镜胚冷却速率、直径及加热温度对面形偏差的影响,得到了偏差工艺参数的敏感性规律。通过对面形偏差进行两次迭代补偿,面形偏差值从-84μm降到33μm,补偿后的结果满足设计要求。采用离心熔铸技术,可以制备满足上表面垂直偏差在30~40μm范围内的非球面镜镜胚。
Centrifugal melting casting technology has unique advantages in the manufacture of largeaspheric mirror blanks.In this paper,the centrifugal casting process and the quality of the mold embryo were studied in depth by using a self-developed shrinkage model experiment machine.In order to obtain the required mirror blank,the processes of preparing the coating,heating,cooling and preserving the heat of the mold were introduced in detail.The influencing factors of shape deviation in the mirror blank production were studied by comparing simulation values with experimental results.The influence of the coefficient of thermal expansion,cooling rate,diameter,and heating temperature on the surface deviation was analyzed,and a mathematical expression relating these parameters to the deviation was derived.The compensation of the deviation was then calculated in two iterations,thus reducing the surface deviation from 84 to 33 μm. The compensation results met the design requirements.Using centrifugal casting technology,the aspheric mirror embryo can be prepared to meet the vertical deviation specifications of its upper surface in the range of 30~40μm.
作者
张心明
徐鑫莉
蔡鹏
于阳
赵立新
ZHANG Xin-ming 1 ,XU Xin-li 1,2 ,CAI Peng 3 ,YU Yang 4 ,ZHAO Li-Xin 5(1.Changchun University of Science and Technology,College of Mechanical and Electric Engineering, Changchun 130022, China,2.Jilin Business And Technology College, Engineering Institute,Changchun 130507, China,3.China FAW Group Corporation Intelligent NetworkDevelopment Institute, Changchun 130000, China,4.Changchun Institute of Optics, Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033, China,5.Returned Overseas Personnels and Expert Service Center Jilin Province,Changchun 130022, Chin)
出处
《光学精密工程》
EI
CAS
CSCD
北大核心
2018年第7期1719-1727,共9页
Optics and Precision Engineering
基金
吉林省自然科学基金资助项目(No.20150101024JC)
关键词
离心熔铸
非球面镜镜胚
工艺
面形偏差
迭代补偿
centrifugal melting casting
aspheric mirror blank
process
surface deviation
compensation
