Chemical vapor deposition (CVD) diamond coated drills are fabricated by depositing diamond films
on Co-cemented tungsten carbide (WC-Co) drills. The characteristics of as-deposited diamond coatings are investigated
by scanning electron microscope (SEM) and Raman spectra. To evaluate the cutting performance of
diamond coated drills, comparative drilling tests are conducted using diamond coated and uncoated WC-Co drills,
with carbon fiber reinforced plastics (CFRPs) as the workpiece on a high-speed computer numerical control (CNC)
machine. Thrust force and tool wear are measured during the drilling process. The results show that diamond
coated drill exhibits better cutting performance, compared with the uncoated drill. The value of flank wear is
about 70 μm after machining 90 holes, about a half of that of theWC-Co drill with 145μm after drilling only 30
holes. The wear rate of WC-Co drill is higher than that of diamond coated drill before diamond films peeling
off. The diamond coated drill achieves more predictable hole quality. The improved cutting performance of the
diamond coated drill is due to the high hardness, wear resistance and low coefficient of friction.
ZHANG Jian-guo (张建国), SHEN Bin (沈 彬), SUN Fang-hong* (孙方宏)
. Fabrication and Drilling Tests of Chemical Vapor Deposition Diamond Coated Drills in Machining Carbon Fiber Reinforced Plastics[J]. Journal of Shanghai Jiaotong University(Science), 2013
, 18(4)
: 394
-400
.
DOI: 10.1007/s12204-013-1413-2
[1] Lin S C, Chen I K. Drilling carbon fiber-reinforced composite material at high speed [J]. Wear, 1996, 194(1-2): 156-162.
[2] Faraz A, Biermann D, Weinet K. Cutting edge rounding: An innovative tool wear criterion in drilling CFRP composite laminates [J]. International Journal of Machine Tools and Manufacture, 2009, 49(15): 1185-1196.
[3] Tsao C C, Kuo K L, Hsu I C. Evaluation of a novel approach to a delamination factor after drilling composite laminates using a core-saw drill [J]. The International Journal of Advanced Manufacturing Technology, 2012, 59(5-8): 617-622.
[4] Iliescu D, Gehin D, Gutierrez M E, et al. Modeling and tool wear in drilling of CFRP [J]. International Journal of Machine Tools and Manufacture, 2010, 50(2): 204-213.
[5] Tsao C C. Thrust force and delamination of core-saw drill during drilling of carbon fiber reinforced plastics (CFRP) [J]. The International Journal of Advanced Manufacturing Technology, 2008, 37(1-2): 23-28.
[6] Zhang L B,Wang L J, Liu X Y. A mechanical model for predicting critical thrust forces in drilling composite laminates [J]. Journal of Engineering Manufacture, 2001, 215(2): 135-146.
[7] Hocheng H, Tsao C C. Comprehensive analysis of delamination in drilling of composite materials with various drill bits [J]. Journal of Materials Processing Technology, 2003, 140(1-2): 335-339.
[8] Davim J P, Reis P. Study of delamination in drilling carbon fiber reinforced plastics (CFRP) using design experiments [J]. Composite Structure, 2003, 59(4): 481-487.
[9] Shyha I S, Aspinwall D K, Soo S L, et al. Drill geometry and operating effects when cutting small diameter holes in CFRP [J]. International Journal of Machine Tools and Manufacture, 2009, 49(12-13): 1008-1014.
[10] Rawat S, Attia H. Wear mechanisms and tool life management of WC-Co drills during dry high speed drilling of woven carbon fibre composites [J]. Wear, 2009, 267(5-8): 1022-1030.
[11] Gao H, Bao Y J, Feng ZM. A study of drilling unidirectional carbon/epoxy composites [J]. International Journal of Abrasive Technology, 2011, 4(1): 1-13.
[12] Gao Hang, Liu Guo-xing, Zhang Xuan-long, et al. Research on abrasive wear characteristics of electroplated diamond tool during drilling carbon fiber reinforced plastics [J]. Journal of Dalian University of Technology, 2011, 51(5): 675-680 (in Chinese).
[13] Bao Yong-jie, Gao Hang, Li Feng-quan. Researches on drilling CFRP (carbon fiber reinforced plastics) with diamond electroplated drill bit [J]. Diamond and Abrasives Engineering, 2009, 28(3): 38-42 (in Chinese).
[14] Xu Jiu-hua, Mu Juan, Chen Yan, et al. Analysis on CFRP hole making with brazed diamond core drill [J]. Journal of Nanjing University of Aeronautics and Astronautics, 2012, 44(5): 747-753 (in Chinese).
[15] Mu J, Xu J H, Chen Y, et al. CFRP drilling with brazed diamond core drill [J]. Solid State Phenomena, 2011, 175: 27-32.
[16] He Hu, Su Hong-hua, Chen Yan, et al. Researches of hole quality during drilling of CFRP with brazed diamond core drill [J]. Diamond and Abrasives Engineering, 2011, 30(2): 13-16 (in Chinese).
[17] Dold C, Henerichs M, Bochmann L, et al. Comparison of ground and laser machined polycrystalline diamond (PCD) tools in cutting carbon fiber reinforced plastics (CFRP) for aircraft structures [J]. Procedia CIRP, 2012, 1: 178-183.
[18] Wang Y G, Yan X P, Chen X G, et al. Cutting performance of carbon fiber reinforced plastics using PCD tool [J]. Advanced Materials Research, 2011, 215: 14-18.
[19] Heaney P J, Sumant A V, Torres C D, et al. Diamond coatings for micro end mills: Enabling the dry machining of aluminum at the micro-scale [J]. Diamond and Related Materials, 2008, 17(3): 223-233.
[20] Davim J P, Mata F. Chemical vapour deposition (CVD) diamond coated tools performance in machining of PEEK composites [J]. Materials and Design, 2008, 29: 1568-1574.
[21] Kr¨of A, Feistritzer S, Udier K. Diamond coated cutting tools for machining of non-ferrous metals and fibre reinforced polymers [J]. International Journal of Refractory Metals and Hard Materials, 2006, 24(5): 354-359.
[22] Sheikh-Ahmad J, Sridhar G. Edge trimming of CFRP composites with diamond coated tools: Edge wear and surface characteristics [C]//Proceedings of General Aviation Technology Conference and Exhibition. Wichita, Kansas: SAE, 2002: 01-1526.
[23] Shen B, Sun F H, Xue H G, et al. Study on fabrication and cutting performance of high quality diamond coated PCB milling tools with complicated geometries [J]. Surface Engineering, 2009, 25(1): 70-76.
