YANG Zhao-jun, YANG Yong-hai, JIA Qing-xiang, WANG Wei-guo. Prediction of micro drill break through thrust monitoring[J]. Editorial Office of Optics and Precision Engineering, 2003,(5): 477-480
YANG Zhao-jun, YANG Yong-hai, JIA Qing-xiang, WANG Wei-guo. Prediction of micro drill break through thrust monitoring[J]. Editorial Office of Optics and Precision Engineering, 2003,(5): 477-480DOI:
With 50 HSS twist drills of 0.4 mm in diameter used as samples on a CNC high speed precise drilling machine
limit thrust values of micro drill breaks were examined while No.45 carbon steel was drilled. It is concluded from parameter evaluation and statistics that the limit thrust values obey the logarithm normal distribution law. The way of monitoring the threshold of thrust was also developed using the reliability theory. Experimental on-line monitoring was run at different reliable levels. When the reliable level selected was 0.999 and the drill utilization ratio was the same as that of in ordinary drills
the drill break ratio of 10 drills decreased from 30% to 0.
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