Journal of the Korean Society for Precision Engineering (한국정밀공학회지)

Korean Society for Precision Engineering (한국정밀공학회)
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Wear Characteristics of CBN Tools on Hard Turning of AISI 4140

고경도강(AISI 4140, HrC60)의 하드터닝에서 가공속도 및 윤활조건 변경에 따른 CBN 공구의 마모 특성

  • Yang, Gi-Dong (Department of Manufacturing System R&D, Korea Institute of Industrial Technology) ;
  • Park, Kyung-Hee (Department of Manufacturing System R&D, Korea Institute of Industrial Technology) ;
  • Lee, Myung-Gyu (Department of IT Converged Process R&D, Korea Institute of Industrial Technology) ;
  • Lee, Dong Yoon (Department of IT Converged Process R&D, Korea Institute of Industrial Technology)
  • 양기동 (한국생산기술연구원 생산시스템연구실용화그룹) ;
  • 박경희 (한국생산기술연구원 생산시스템연구실용화그룹) ;
  • 이명규 (한국생산기술연구원 IT융합공정연구실용화그룹) ;
  • 이동윤 (한국생산기술연구원 IT융합공정연구실용화그룹)
  • Received : 2014.05.06
  • Accepted : 2014.07.03
  • Published : 2014.09.01
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Abstract

Hard turning is a machining process for hardened materials with high surface quality so that grinding process can be eliminated. Therefore, the hard turning is capable of reducing machining time and improving productivity. In this study, hardened AISI4140 (high-carbon chromium steel) that has excellent yield strength, toughness and wear resistance was finish turned using CBN tools. Wear characteristics of CBN tool was analyzed in dry and MQL mixed with nano-particle (Nano-MQL). The dominant fracture mechanism of CBN tool is diffusion and dissolution wear on the rake surface resulting in thinner cutting edge. Abrasive wear by hard inclusion in AISI4140 was dominant on the flank surface. Nano-MQL reduced tool wear comparing with the dry machining but chip evacuation should be considered. A cryogenically treated tool showed promising result in tool wear.

Keywords

References

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