Discrete Element Simulation for Cracks in Optical Glass Ultra-precision Machining
-
摘要: 通过力学性能的数值模拟实验及校准,建立了光学玻璃的离散元模型和超精密切削加工的模型,并对其微切削过程进行了模拟;分析了在不同刀具前角、切削深度及切削速度加工条件下对加工后表面裂纹形成的影响。结果表明:加工表面的裂纹数目和裂纹最大深度随切削深度的增大而增大,而随刀具前角的增大而减小;加工表面的裂纹数目随切削速度的增大而减小,裂纹最大深度随切削速度的增大而增大。Abstract: The discrete element model of optical glass and the model of ultra-precision machining process were con-structed by numerical simulation and calibration of mechanical properties.Based on these models,the mir-co-machining process of optical glass was simulated,and the effects of different rake angles,cutting depths and cut-ting speeds on the formation of surface cracks were also analyzed.The result show that both of the surface crack number and maximum depth increase with the increasing of cutting depth, while decrease with the increasing of rake angle.The maximum depth increases with the increasing of cutting speed,and the surface cracks decrease with theincrease of cutting speed.
-
Key words:
- calibration /
- computer simulation /
- crack /
- crack initiation
-
[1] 周泽华，郑汉卿，曾志新，等．玻璃切削机理-玻璃切削模型及切削过程[J]. 机械工程学报，1993，29(2): 13-18 Zhou Z H，Zheng H Q，Zeng Z X，et al. Mechanism of the glass cutting-glass cutting model and glass cutting process [J]. Chinese Journal of Mechanical Engineering，1993，29(2): 13-18 (in Chinese) [2] 孟彬彬．光学玻璃磨削裂纹形成过程仿真及试验研究[D]. 哈尔滨: 哈尔滨工业大学，2011 Meng B B. Simulation and experimental research of cracks forming process in optical glass grinding[D]. Harbin:Harbin Institute of Technology，2011 (in Chinese) [3] Liu K，Li X P，Liang S Y，et al. Nanometer-scale，ductile-mode cutting of soda-lime glass[J]. Journalof Manufacturing Processes，2005，7(2): 95-101 [4] Fang F Z，Liu X D，Lee L C. Micro-machining of optical glasses-A review of diamond cutting glasses[J]. Sadhana，2003，28(5): 945-955 [5] 刘凯欣，高凌天．离散元法研究的评述[J]. 力学进展，2003，(4): 483-490 Liu G X，Gao L T. A review on the discrete element method[J]. Advances in Mechanics，2003，(4): 483-490 (in Chinese) [6] Cudall P A，Strack O D L. A discrete numerical model for granular assembles[J]. Geotechnique，1979，299(1): 47-65 [7] Huang H. Discrete element modeling of tool-rock inter-action[D]. Salt Lake: University of Minnesota，1999 [8] Tan Y Q，Yang D M，Sheng Y. Discrete elemenr method(DEM)modeling of fracture and damage in the machining process of polycrystalline SiC[J]. Journal of the Europe anCeramic Society，2009，26: 1029-1037 [9] 刘宏，周里群，刑国．基于离散元法对冷硬铸铁切削过程的模拟[J]. 机械科学与技术，2011，30(12): 2048-2051 Liu H，Zhou L Q，Xin G. Simulation of the cutting processes of chilled cast iron based on DEM[J]. Me-chanical Science and Technology for Aerospace Engi-neering，2011，30(12): 2048-2051 (in Chinese) [10] 贾鹏，周朋．金刚石切削 Soda-lime 玻璃中的刀具磨损及其对工件表面粗糙度的影响[J]. 摩擦学学报，2012，32(1): 21-26 Jia P，Zhou P. Tool wear and its effect on surface roughness in diamond cutting of glass soda lime[J]. Chinese Journal of Mechanical Engineering，2012，32(1): 21-26 (in Chinese) [11] Itasca Consulting Group Inc. PFC2D (Particle Flow Code in 2-dimensions)Manual(Version 3．10) [M]. Minneapolis: Itasca Consulting Group Inc．，2002 [12] Potyondy DO，Cundall P A. A bonded-particle model for rock[J]. International Journal of Rock Mechanics & Mining Science，2004，41(8): 1329-1364 [13] Arif M，Rahman M，San W Y，et al. An experimental approach to study the capability of end-milling for micro-cutting of glass[J]. International Journal of Advanced Manufacturing Technology，2011，(53): 1063-1073 [14] 张国锋．光学玻璃切削过程中金刚石刀具磨损规律的实验研究[D]. 哈尔滨: 哈尔滨工业大学，2010 Zhang G F. Experimental study of tool wear in diamond cutting of optical glass[D]. Harbin: Harbin Institute of Technology，2010 (in Chinese) [15] 修树东，周明，李敏．光学玻璃微切削时材料去除机理和表面质量的研究[J]. 刀具技术，2008，42(4): 15-17 Xiu S D，Zhou M，Li M. Research on material removal mechanism and surface quality in micro-cutting of optical glasses[J]. Tool Technology，2008，42(4): 15-17 (in Chinese) -
点击查看大图
计量
- 文章访问数: 353
- HTML全文浏览量: 43
- PDF下载量: 8
- 被引次数: 0
下载:
