[ Papers ]

Journal of the Korean Society of Manufacturing Technology Engineers - Vol. 27, No. 5, pp.401-408

ISSN: 2508-5107 (Online)

Print publication date 15 Oct 2018

Received 05 Sep 2018 Revised 02 Oct 2018 Accepted 08 Oct 2018

DOI: https://doi.org/10.7735/ksmte.2018.27.5.401

CFRP 마이크로 드릴가공에서 다중신호를 이용한 드릴 상태감시

이두희^a

; 윤지찬^a ; 이종환^b ; 김정석^c^{, *}

Drill State Monitoring by Multiple Cutting-Process Signals in CFRP Microdrilling

Doo-Hee Lee^a

; Ji-Chan Yoon^a ; Jong-Hwan Lee^b ; Jeong-Suk Kim^c^{, *}

aSchool of Mechanical Engineering, Pusan National University, 2, Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan 46241, Korea
bDepartment of Mechartronics Engineering, Korea Plytechnic Air Collleges, 46, Daehak-gil, Sacheon, Gyeongnam-do, 52549, Korea
cEngineering Research Center for Net Shape and Die Manufacturing (ERC/NSDM), School of Mechanical Engineering, Pusan National University, 2, Busandaehakr-ro 63beon-gil, Geumjeong-gu, Busan 46241, Korea

Correspondence to: ^*Tel.: +82-51-510-2334 Fax: +82-51-518-7207 E-mail address: juskim@pusan.ac.kr (Jeong-Suk Kim).

Abstract

The machinability of carbon fiber reinforced plastic (CFRP) is very poor because of its properties that make it difficult-to-machine, and machining trouble is often observed during microdrilling owing to easy drill wear and fracture. Therefore, it is important to effectively monitor the drill tool state in microdrilling operations. Cutting force and acoustic emission (AE) signals are often used to monitor tool states during limited cutting conditions. Using the cutting force and AE signals simultaneously is suggested in this investigation to increase the effectiveness of monitoring tool states in microdrilling. The relationship between tool wear propagation and these signal characteristics are verified for various feed rates, and a good correlation is obtained from the signal processing results in the frequency domain. The power threshold level of simultaneous cutting force and AE signals in the frequency domain can be adopted to monitor microdrilling states of CFRP drilling.

Keywords:

Carbon fiber reinforced plastic, Cutting force, Acoustic emission (AE), Micro drilling, Tool wear propagation, Threshold level

Acknowledgments

이 논문은 2015년도 정부(교육부)의 재원으로 한국연구재단의 지원을 받아 수행된 기초연구사업임(No. NRF-2015R1D1A1A01059461).

References

Rahman, M., Ramakrishna, S., Prakash, J. R. S., Tan, D. C. G., 1999, Machinability Study of Carbon Fiber Reinforced Composite, Journal of Materials Processing Technology 89:90 292-297.
Yoon, Y. S., Kwon, O. H., 2000, The Application of AE for a Drilling Process Monitoring in [0/90° ]s CFRP Composites, Journal of Mechanical Science and Technology A, 24:6 1491-1498.
Kim, H. C., Kim, K. S., 1998, AE(Acoustic Emission) Signal Characteristics of Drilling for CFRP Composite Materials, Journal of Korean Institute of Industrial Educators, 23:2 159-325.
Wu, X., Li, L., He, N., Hao, X., 2016, Experimental Study on Micro Milling of Carbon Fiber Reinforced Plastics, Materials Science Forum, 836-837 185-190. [https://doi.org/10.4028/www.scientific.net/MSF.836-837.185]
Iliescu, D., Gehin, D., Gutierrez, M.E., Girot, F., 2010, Modeling and Tool Wear in Drilling of CFRP, International Journal of Machine Tools & Manufacture, 50:2 204-213.
Kondo, E., Shimana, K., 2012, Monitoring of Prefailure Phase and Detection of Tool Breakage in Micro-Drilling Operations, Procedia CIRP, 1 581-586. [https://doi.org/10.1016/j.procir.2012.05.003]