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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 19    Special 1    September 2009

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Characteristics of damaged layer in micro-machining of copper material
Dong-Hee KWON1, Jeong-Suk KIM1, Myung-Chang KANG2, Se-Hun KWON2, Jong-Hwan LEE3
 

1. School of Mechanical Engineering, Pusan National University, Busan, 609-735, Korea;

Abstract:The study on damaged layer is necessary for improving the machinability in micro-machining because the damaged layer affects the micro mold life and micro machine parts. This study examined the ultra-precision micro-machining characteristics, such as cutting speed, feed rate and cutting depth, of a micro-damaged layer produced by an ultra-high speed air turbine spindle. The micro cutting force, surface roughness and plastic deformation layer were investigated according to the machining conditions. The damaged layer was measured using optical microscope on samples prepared through metallographic techniques. The scale of the damaged layer depends on the cutting process parameters, particularly, the feed per tooth and axial depth of the cut. According to the experimental results, the depth of the damaged layer is increased by increasing the feed per tooth and cutting depth, also the damaged layer occurs less in down-milling compared with up-milling during the micro-machining operation.

 

Key words: damaged layer; micro-machining; down-milling; up-milling

ISSN 1672-7029
CN 43-1423/U

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