Journal of the Korean Society for Precision Engineering (한국정밀공학회지)

Korean Society for Precision Engineering (한국정밀공학회)
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Evaluation of Clamping Characteristics for Subminiature Screws According to Thread Angle Variation

초소형 나사의 나사산 각도변화에 따른 체결특성 평가

  • Min, Kyeong Bin (Department of Mechanical System Design Engineering, Seoul National University of Science and Technology) ;
  • Kim, Jong Bong (Department of Mechanical and Automotive Engineering, Seoul National University of Science and Technology) ;
  • Park, Keun (Department of Mechanical System Design Engineering, Seoul National University of Science and Technology) ;
  • Ra, Seung Woo (Research Center, Seoul Metal Co., Ltd.)
  • 민경빈 (서울과학기술대학교 기계시스템디자인공학과) ;
  • 김종봉 (서울과학기술대학교 기계자동차공학과) ;
  • 박근 (서울과학기술대학교 기계시스템디자인공학과) ;
  • 나승우 ((주)서울금속 기술연구소)
  • Received : 2014.03.03
  • Accepted : 2014.08.08
  • Published : 2014.09.01
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Abstract

Recent trends in the miniaturization and weight reduction of portable electronic parts have driven the use of subminiature screws with a micrometer-scale pitch. As both screw length and pitch decrease in subminiature screws, the resulting clamping force becomes diminishes. In this work, Finite element (FE) analysis is performed to evaluate clamping force of a screw assembly, with a comparison with experimental result. To improve clamping force of subminiature screws, a new screw design is considered by modifying screw thread angle: the thread angle is varied as an asymmetric way unlike the conventional symmetric thread angle. FE analyses are then performed to compare the clamping characteristics of each subminiature screw with different thread angle. The effect of thread angles on the clamping force is then discussed in terms of structural safety for both positive and negative screws.

Keywords

References

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