Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
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Numerical Analysis of the Flow Characteristics of High-Pressure Injection Nozzle for Machine Tools

공작기계용 HP Holder 분사노즐 유동특성에 관한 수치해석

  • Yi, Chung-Seob (School of Mechanical Engineering, Gyeongsang Nat'l Univ.) ;
  • Yun, Ji-Hun (School of Mechanical Engineering, Gyeongsang Nat'l Univ.) ;
  • Jeong, In-Guk (School of Mechanical Engineering, Gyeongsang Nat'l Univ.) ;
  • Song, Chul-Ki (School of Mechanical Engineering, Gyeongsang Nat'l Univ., ERI) ;
  • Suh, Jeong-Se (School of Mechanical Engineering, Gyeongsang Nat'l Univ., ERI)
  • 이중섭 (경상대학교 기계공학부) ;
  • 윤지훈 (경상대학교 기계공학부) ;
  • 정인국 (경상대학교 기계공학부) ;
  • 송철기 (경상대학교 기계공학부, ERI(공학연구원)) ;
  • 서정세 (경상대학교 기계공학부, ERI(공학연구원))
  • Received : 2011.04.12
  • Accepted : 2011.06.22
  • Published : 2011.10.01
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Abstract

In this study, the flow characteristics of an injection nozzle installed in a high-pressure holder for improving productivity were determined. The inlet velocity, nozzle inflow angle, and nozzle outlet diameter were selected as design factors having an influence on the flow characteristics, and numerical analysis was conducted for these factors. As the inlet velocity is high and the nozzle outlet diameter is small, the pressure and velocity of the injected flow are high. In the case of the nozzle inflow angle, the variation of flow characteristics according to angle was slight, but the highest pressure and velocity were found at $15^{\circ}$. In addition, the possibility of chip elimination by the injected flow was analyzed on the basis of the numerical results.

본 연구에서는 절삭가공 시 생산성 향상을 위해 사용되는 고압분사 홀더(hp holder)에 들어가는 노즐의 유동특성을 파악하였다. 집중형의 노즐 분사형태를 유지하면서 분사되는 유동에 영향을 주는 설계인자로 입구 유입속도, 노즐 유입각도, 노즐 출구직경을 설정하여 이에 대한 수치해석을 수행하였다. 그 결과 입구 유입속도가 높을수록, 노즐 출구직경이 작을수록 분사되는 유체의 압력과 속도가 높은 것으로 나타났다. 노즐 유입각도의 경우에는 각도변화에 따른 유동특성의 차이가 크지 않았지만 약 $15^{\circ}$일 때가 가장 높은 유동특성을 보였다. 또한 결과값을 이용하여 분사되는 유체의 힘에 의해 가공 시 발생하는 칩의 제거 가능 여부를 확인해 보았다.

Keywords

References

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