Formation mechanism and suppression method of hole edge damage in drilling optical glass

Li-jie MA; Hong-wen LIU; Hai-tao QU; Zhan-kui WANG; Jian-xiu SU

doi:10.37188/OPE.20202807.1528

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Formation mechanism and suppression method of hole edge damage in drilling optical glass

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

- Formation mechanism and suppression method of hole edge damage in drilling optical glass
- Optics and Precision Engineering Vol. 28, Issue 7, Pages: 1528-1538(2020)
- 作者机构：
  
  河南科技学院机电学院, 河南新乡 453003
- 作者简介：
- 基金信息：
- DOI：10.37188/OPE.20202807.1528
  CLC： TH162.1
- Received：17 November 2019，
  
  Revised：04 January 2020，
  
  Accepted：04 January 2020，
  
  Published：15 July 2020
- 稿件说明：
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Li-jie MA, Hong-wen LIU, Hai-tao QU, et al. Formation mechanism and suppression method of hole edge damage in drilling optical glass[J]. Optics and precision engineering, 2020, 28(7): 1528-1538.
DOI：

Li-jie MA, Hong-wen LIU, Hai-tao QU, et al. Formation mechanism and suppression method of hole edge damage in drilling optical glass[J]. Optics and precision engineering, 2020, 28(7): 1528-1538. DOI： 10.37188/OPE.20202807.1528.

摘要

由于光学玻璃高硬度、高脆性和低断裂韧性的力学性能，边缘损伤已成为光学玻璃加工的常见缺陷形式，严重制约了加工质量的提高。基于BK7光学玻璃的钻削试验，分析了孔入口和出口边缘损伤的基本特征；利用脆硬材料的压缩断裂理论，探讨了孔口损伤的形成机理；研究了钻削参数对孔口损伤的影响规律。在此基础上，初步探索了旋转超声钻削（Rotary Ultrasonic Drilling，RUD）和旋转超声啄式钻削（RUPD）工艺对孔口损伤的抑制效果。结果表明："局部崩边"是孔入口损伤的主要形式，"整体剥落"和"不连续崩碎"相互叠加是孔出口损伤的表现形式；金刚石磨棒端面磨粒的刻划切入所导致的亚表层侧向裂纹扩展是造成入口损伤的重要原因，而中位裂纹扩展和轴向压溃是出口损伤的主要成因。RUD能够有效抑制孔口损伤，其最大入口崩边尺寸和最大出口剥落尺寸分别为普通钻削的15%~50%和45%~65%。RUPD能够促进磨屑和脱落磨粒的排出，因此可以获得更小的出口损伤。

Abstract

Optical glass is the key material for manufacturing optical devices such as lenses and filter mirrors. Owing to its high hardness

high brittleness and low fracture toughness

edge damage has been the major defect during the machining of optical glass. Based on the drilling experiment of BK7 optical glass

the damage characteristics at the entrance and exit of the machined hole were analyzed; subsequently

the formation mechanism of edge damage was discussed by using the compression fracture theory of brittle materials; and finally

the influence of drilling parameters was studied. Consequently

the suppression effect of Rotary Ultrasonic Drilling (RUD) and Rotary Ultrasonic Pecking Drilling (RUPD) on edge damage was studied. The results indicate that 'local edge chipping' is the main form of the entrance damage

and the superposition of 'layer separation' and 'discontinuous chipping' is the main character of the exit damage. The subsurface lateral crack expansion

caused by squeezing the tool end abrasive

is the main cause of generating entrance damage

whereas the middle crack expansion and axial collapse are the main causes of exit damage. The RUD has a clear effect on the reduction of hole edge damage:its maximum entrance chipping size Lin_max and the maximum exit separation size can be decreased by 15%-50% and 45%-65% of common drilling

respectively. The RUPD can promote the expulsion of abrasive scraps; thus

achieving less exit damage than the RUD.

关键词

Keywords

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