Transactions of the Korean Society of Machine Tool Engineers (한국공작기계학회논문집)

The Korean Society of Manufacturing Technology Engineers (한국생산제조학회)
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Design of Tool Clamping Device Based on a Shape Memory Alloy

형상기억합금 기반 공구 클램핑 장치 설계

  • 이동주 (충남대학교 기계공학과) ;
  • 신우철 (한국기계연구원 지능형생산시스템연구본부) ;
  • 박형욱 (한국기계연구원 지능형생산시스템연구본부) ;
  • 노승국 (한국기계연구원 지능형생산시스템연구본부) ;
  • 박종권 (한국기계연구원 지능형생산시스템연구본부) ;
  • 정준모 (충남대학교 기계공학과 대학원)
  • Published : 2008.10.15
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Abstract

This paper describes a tool-clamping/unclamping mechanism for application of a micro-spindle. The mechanism is based on one-way shape memory effect and interference-fit. The corresponding mathematical models and a few considerable design parameters are mentioned in this paper. Especially, necessary conditions for the clamping and unclamping operation are investigated through finite element analysis. The analysis results show that the differences between the diametral deformations of the tool holder in high temperature and that in low temperature are increased according to amounts of the interference. Thus the less interference between the tool-holder and the ring, the less tolerance to allow the clamping and unclamping operation because the inner diameter of the tool holder in high temperature should be smaller than the diameter of the tool shank, and that in low temperature should be larger than the diameter of the tool shank. In addition, the design for maximization of clamping force are investigated based on finite element analysis. The results show that the more amounts of the interference, the more clamping force. As the result, the interference should be considered as a important factor to maximize the tool clamping force.

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References

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