Applied Microscopy

Korean Society of Microscopy (한국현미경학회)
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Estimation of Machinability of Lead Brass Based on In-Situ Observation in Scanning Electron Microscope

전자현미경 In-Situ 관찰방법을 이용한 황동의 절삭성평가

  • Jung, Seung-Boo (Division of Advanced Analysis Center, Korea Institute of Science and Technology) ;
  • Lim, Ok-Dong (Division of Advanced Analysis Center, Korea Institute of Science and Technology) ;
  • An, Seong-Uk (Division of Advanced Analysis Center, Korea Institute of Science and Technology)
  • 정승부 (한국과학기술연구원 특성분석센타) ;
  • 임옥동 (한국과학기술연구원 특성분석센타) ;
  • 안성욱 (한국과학기술연구원 특성분석센타)
  • Published : 1994.09.01
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Abstract

In order to elucidate the machinability of lead brass, orthogonal machining experiment was conducted in SEM(Scanning Electron Microscope) equipped with a micro-machining device at a cutting speed of $7{\mu}m/s$ for brass containing 0.2 to 3wt% Pb. The microfactors (i.e., shear angle, contact length between chip and tool) were determined by in-situ observations. Machinability of brass containing lead is discussed in terms of the microfactors and the cutting resistant force tested by lathe cutting. The dynamic behavior of the chip formation of lead brass during the machining process was examined: The chips of lead brass form as a shear angle type. The shear angle increases with the content of lead in (6:4) brass. The pronounced effect of lead on the contact length between chip and tool was observed above 1% Pb. The cutting resistant force tested by lathe decreases remarkably with the lead content in brass. The observed microfactors are in close relation to the tested resistant force in macromachining.

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