Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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Machinability of CBN Tools in Interrupted Milling Process of Die & Mold Steels with High Hardness

고경도 금형강 단속 밀링절삭에 대한 CBN 공구의 가공 성능

  • Song, Jun-Hee (Department of Mechanical & Automotive Engineering, Jeonju University) ;
  • Mun, Sang-Don (Department of Mechanical Design Engineering, Chonbuk National University)
  • 송준희 (전주대학교 기계자동차공학과) ;
  • 문상돈 (전북대학교 기계설계공학부)
  • Received : 2009.12.04
  • Published : 2010.07.22
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Abstract

When high-speed interrupted cutting is carried out for die and mold steels with high hardness, CBN tools manifested a significantly longer wear life than carbide, ceramic, or cermet tools in an experiment of face milling characteristics. In addition, it was also found that they secured a stable surface roughness within a range of 1.6 S~6.3 S, an acceptable range for precision machining for polished machining parts. And it makes them acceptable in the precision machining field, except in industries where very high machining accuracy is required. In the high hardness interrupted cutting, it was advantageous to perform a negaland treatment and a honning treatment on the tools' cutting edge to extend tool life and surface roughness. Also, severe crater development was found on the sloped face in CBN tools following high-speed machining. This caused the cutting edge to be weakened and damaged, and ultimately resulted in a shorter tool life. Finally, as a result of EDX mapping inspection, Cr component was detected evenly on the entire crater wear area, which can be included only in STD 11.

Keywords

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