ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Sequential Laser Drilling Technology
Received date: 2013-05-30
Revised date: 2013-08-15
Online published: 2013-08-21
This paper reports a new processing method that makes a hole rapidly with millisecond pulse laser in scale of joule pulse energy in nickel-based alloy at first, and enlarges the original hole with nanosecond pulse laser in scale of mJ pulse energy secondly for making higher quality cooling holes in aero-engine. In this way we attempt to eliminate the recast of holes made by millisecond pulse laser and resolve the problems of long processing time and limited processing depth caused by nanosecond pulse laser directly making holes with negligible recast,so making high quality holes with higher processing efficiency could be realized. The experimental results show that this method could remove the recast around the holes made by millisecond pulse laser effectively and improve the hole's inner surface quality; compared with nanosecond pulse laser making holes directly, it is effective in increasing the processing efficiency for holes of around 1 mm depth, but no apparent effect in shortening processing time in making holes of above 2 mm depth. Based on the research results and analysis, a few ideas for improving this kind of processing technique are proposed.
Key words： lasers; drilling; film-cooling hole; recast layer; nanosecond laser; millisecond laser
ZHANG Xiaobing , SUN Ruifeng . Sequential Laser Drilling Technology[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2014 , 35(3) : 894 -901 . DOI: 10.7527/S1000-6893.2013.0362
[1] Corcoran A, Sexton L, Seaman B, et al. The laser drilling of multi-layer Rene80 and X40 material systems[C]//Section B-ICALEO. Florida: Laser Institute of America, 2000: 163-172.
[2] Rong L R. Laser drilling technology for micro-hole and its application in aviation and aerospace[J]. Aviation Precision Manufacturing Technology, 2009, 45(6): 30-33. (in Chinese) 荣烈润. 激光微细孔加工技术及其在航空航天领域中的应用[J]. 航空精密制造技术, 2009, 45(6): 30-33.
[3] Chen X L, Liu X B. Short pulsed laser machining: How short is short enough[J]. Journal of Laser Applications, 1999, 11(6): 268-272.
[4] Bandyopadhyay S, Sarin Sundar J K, Sundararaian G, et al. Geometrical features and metallurgical characteristics of Nd:YAG laser drilling holes in thick IN718 and Ti-6Al-4V sheets[J]. Journal of Materials Processing Technology, 2002, 127(1): 83-95.
[5] Zhu Q Y. Laser precise processing[M]. Beijing: China Machine Press, 1990: 207-211. (in Chinese) 朱企业. 激光精密加工[M]. 北京: 机械工业出版社, 1990: 207-211.
[6] Guo W Y, Wang M C, Zhang X B. Recast layer former by laser drilling in Ni-based alloys and progress on its control [J]. Laser Journal, 2003, 24(4): 1-3. (in Chinese) 郭文渊, 王茂才, 张晓兵. 镍基超合金激光打孔再铸层及其控制研究进展[J]. 激光杂志,2003, 24(4): 1-3.
[7] Li Z Y, Yu W C, Wang L. The affect for fatigue life of directional solidified alloy of DZ22 by recast structure formed by laser[J]. Journal of Material Engineering, 1994(8): 31-32. (in Chinese) 李志友, 于维成, 王理. 激光表面再铸层结构对DZ22定向凝固合金疲劳性能的影响[J]. 材料工程, 1994(8): 31-32.
[8] Pandey N D, Mohandas T, Shan H S. Cooling ability based integrated quality of laser-drilled holes[J]. Defense Science Journal, 2006, 56(1): 93-101.
[9] Li Q, Zheng Y J, Wang Z Y, et al. A novel high-peak power double AO Q-switches pulse Nd:YAG laser for drilling[J]. Optics & Laser Technology, 2005, 37(5): 357-362.
[10] Li L, Diver C, Atkinson J, et al. Sequential laser and EDM micro-drilling for next generation fuel injection nozzle manufacture[J]. CIRP Annals-Manufacturing Technology, 2006, 55(1): 179-182.
[11] Hu B, Hu L M. Numerical model of thermal cycle in arc welding of steel plate and sheet[J]. Journal of Shaanxi University of Technology: Natural Science Edition, 2008, 24(1): 5-8. (in Chinese) 胡波, 胡礼木. 中厚、薄板快速电弧焊热循环数学模型[J]. 陕西理工学院学报: 自然科学版, 2008, 24(1): 5-8.
[12] Booth H J. Recent applications of pulsed lasers in advanced materials processing[J]. Thin Solid Films, 2004, 453(1): 450-457.
[13] Phipps C. Laser applications overview: the state of the art and the future trend in the United State[J]. Riken Review, 2003, 50: 11-19.
[14] Robb H, Richard B. Laser drilling assists gas turbine cooling[J]. Industrial Laser Solutions China, 2011(50): 22-24.(in Chinese) Robb H, Richard B. 激光钻孔辅助燃气涡轮机冷运行[J]. 工业激光解决方案(中国版), 2011(50): 22-24.
[15] Dausinger F. Drilling of high quality micro holes[C]//Section B-ICALEO. Florida: Laser Institute of America, 2000: 1-10.
/
| 〈 |
|
〉 |
CJA