[1] [1] YANG ZH J,CHEN Y H,YANG Y H.Study on the life distribution of micro-drill[J].Journal of Engineering Manufacture,2002,216(B3):301-305

[2] [2] CHEONG M S,CHO D W,EHMANN K F.Identification and control for micro-drilling productivity enhancement[J].International Journal of Machine Tools & Manufacture,1999,39:1539-1561

[3] [3] LI X L,LI H X,GUAN X P.Fuzzy estimation of feed-cutting force from current measurement-a case study on intelligent tool wear condition monitoring[J].IEEE Trans.Syst.Man.Cybern.Pt C.Appl.Rev.,2004:506-512

[5] [5] YANG ZH J,TAN Q CH,E SH J.On-line monitoring of drilling torques of micro-drills[J].Journal of Engineering Manufacture,2004,218(B3):1735-1740

[8] [8] WALCZAK B,MASSART D L.Rough sets theory[J].Chemometrics and Intelligent Laboratory Systems,1999,47:1-16