Journal of the Korean Society for Precision Engineering (한국정밀공학회지)

Korean Society for Precision Engineering (한국정밀공학회)
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Chip-Tool Friction and Shear Characteristics of Cold Drawn Free Machining Steels in Turning

냉각인발된 쾌삭강의 외경선삭시 칩-공구 마찰 및 전단 특성

  • 이영문 (경북대학교 기계공학부) ;
  • 조삼규 (포항제철 기술연구소) ;
  • 최수준 (창원기능대 전산응용기계기술학과) ;
  • 송태성 (경북대학교 대학원) ;
  • 박태준 (경북대학교 대학원)
  • Published : 1999.12.01
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Abstract

In this study, chip-tool friction and shear characteristics of cold drawn free machining steels in turning were assessed. To do this, a newly developed equivalent oblique cutting model was adopted. And for comparison with those of free machining steels, chip-tool friction and shear characteristics of conventional carbon steels were also investigated. The Pb-S free machining steel shows superior machinability to others. In case of the Bi-S free machining steel, the shear stress and the specific friction energy are relatively lower than those of conventional carbon steels, but its shear strain is relatively high, so it does not show any remarkable improvement of machinability.

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