The Study of High Speed Micro-drilling Performance and Machining Quality of Coated Micro-drills with Zr-C∶H Coatings
The Zr-C∶H coatings with various C2H2 flow rate were deposited on micro-drills (a diameter of 0.2 mm) used a closed field unbalanced magnetron sputtering system.The ultrahigh speed (drilling speed of 160000 rpm) through-hole drilling printed circuit board tests used to evaluate the drilling performance of the coated micro-drills.The rejection criteria of service lives of the coated micro-drills were evaluated using two different criteria:(1) a nail head ratio greater than 1.5; (2) a drilled hole surface roughness greater than 25.4 μm.Adopting a service life criterion of a nail head ratio of 1.5,the Zr-C∶H-5 coating possesses the optimal high-speed machining performance,which yields a micro-drill lifetime of above 6000 drilled holes.It represents a three-fold improvement on that of an uncoated micro-drill and it also improves machining quality.
Zr-C∶H Coating Machining Quality Micro-drills
W.H.Kao Y.L.Su S.H.Yao H.C.Huang M.S.Chen
Institute of Mechatronoptic Systems,Chienkuo Technology University,Changhua,Taiwan Department of Mechanical Engineering,National Cheng Kung University,Tainan,Taiwan Chang Jung Christian University,Tainan,Taiwan
国际会议
广州
英文
342-346
2012-11-16（万方平台首次上网日期，不代表论文的发表时间）