Study on sensitivity of surface deviation for aspheric mirror blank on centrifugal melting casting

Xin-ming ZHANG; Xin-li XU; Peng CAI; Yang YU; Li-Xin ZHAO

doi:10.3788/OPE.20182607.1719

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Study on sensitivity of surface deviation for aspheric mirror blank on centrifugal melting casting

Micro/Nano Technology and Fine Mechanics | 更新时间：2020-08-13

- Study on sensitivity of surface deviation for aspheric mirror blank on centrifugal melting casting
- Optics and Precision Engineering Vol. 26, Issue 7, Pages: 1719-1727(2018)
- 作者机构：
  
  1.长春理工大学机电工程学院, 吉林长春 130022
  2.吉林工商学院工学院, 吉林长春 130507
  3.中国第一汽车集团公司智能网联开发院, 吉林长春 130000
  4.中国科学院长春光学精密机械与物理研究所, 吉林长春 130033
  5.吉林省留学回国人员和专家服务中心, 吉林长春 130022
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20182607.1719
  CLC： O439;TH171.65
- Received：01 November 2017，
  
  Accepted：20 January 2018，
  
  Published：25 July 2018
- 稿件说明：
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Xin-ming ZHANG, Xin-li XU, Peng CAI, et al. Study on sensitivity of surface deviation for aspheric mirror blank on centrifugal melting casting[J]. Optics and precision engineering, 2018, 26(7): 1719-1727.
DOI：

Xin-ming ZHANG, Xin-li XU, Peng CAI, et al. Study on sensitivity of surface deviation for aspheric mirror blank on centrifugal melting casting[J]. Optics and precision engineering, 2018, 26(7): 1719-1727. DOI： 10.3788/OPE.20182607.1719.

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-84 μm降到33 μm，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30~40 μm范围内的非球面镜镜胚。

Abstract

Centrifugal melting casting technology has unique advantages in the manufacture of large aspheric 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 30~40 μm.

关键词

Keywords

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