Journal of the Korean Society of Manufacturing Process Engineers (한국기계가공학회지)

The Korean Society of Manufacturing Process Engineers (한국기계가공학회)
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Chip Breaking Characteristics of S, PbS, and BiS Free Machining Steels

S, PbS 및 Bi S 쾌삭강의 칩절단 특성

  • 이영문 (경북대학교 기계공학부) ;
  • 배대원 (경북대학교 대학원 기계공학과) ;
  • 장준호 (경북대학교 대학원 기계공학과)
  • Published : 2005.06.30
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Abstract

In this study, the chip breaking characteristics of S, PbS and BiS free machining steels have been assessed. PbS free machining steel shows the lowest value of chip thickness ($t_c$) under the same cutting conditions. SM10C steel has the largest value of the chip cross-section area ratio ($R_{CA}$). As the feed rate becomes larger the chip breaking cycle time ($T_B$) decreases and the chip breaking index ($C_B$) increases. The properly controlled-C type chip has been obtained with the value of $C_B$ between 0.05 and 0.2. Free machining steel, PbS produces the properly controlled-C type chip in a wider feed rate range than other steels.

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