Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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Investigation of Fastening Performance of Subminiature Serrated Bolt

초소형 쎄레이션 볼트의 체결성능 분석

  • Jang, Myung Guen (Dept. of Automotive Engineering, Seoul Nat'l Univ. of Science & Tech.) ;
  • Jeong, Jin Hwan (Dept. of Automotive Engineering, Seoul Nat'l Univ. of Science & Tech.) ;
  • Jang, Yeon Hui (Dept. of Automotive Engineering, Seoul Nat'l Univ. of Science & Tech.) ;
  • Kim, Hee Cheol (Dept. of Mech. and Automotive Engineering, Seoul Nat'l Univ. of Science & Tech.) ;
  • Kim, Jong-Bong (Dept. of Mech. and Automotive Engineering, Seoul Nat'l Univ. of Science & Tech.)
  • 장명근 (서울과학기술대학교 자동차공학과) ;
  • 정진환 (서울과학기술대학교 자동차공학과) ;
  • 장연희 (서울과학기술대학교 자동차공학과) ;
  • 김희철 (서울과학기술대학교 기계자동차공학과) ;
  • 김종봉 (서울과학기술대학교 기계자동차공학과)
  • Received : 2016.05.25
  • Accepted : 2016.12.23
  • Published : 2017.04.01
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Abstract

As the size of electric products such as mobile phones and smart watches decrease, the bolts used to assemble these products should also be miniaturized. A miniature-sized bolt has to provide sufficient joining torque and anti-releasing torque to keep the components together. We studied a serrated bolt as a candidate for a miniature-sized fastener to increase the anti-releasing torque. In a serrated bolt, a serrated shape is formed on the bottom surface of the bolt head to create an obstacle to releasing. In this study, finite element analyses for the joining and releasing of bolts were carried out, and the anti-releasing performance was predicted. Based on the results of analyses using various numbers of serrations and fastening depths, the effects of the number of serrations and fastening depth on the anti-releasing performance were investigated.

최근 스마트 폰, 스마트 와치 등과 같은 전자기기의 크기가 작아지면서, 그에 사용되는 체결 볼트의 크기 또한 작아지고 있다. 초소형 나사는 제품을 체결하는 데 있어 충분한 체결 토크나 풀림 방지효과를 갖지 못한다. 그래서 초소형 나사의 체결력과 풀림방지 효과를 유지 및 강화하는 연구가 필요하다. 본 연구에서는 초소형 나사의 풀림방지 효과를 강화하기 위해 나사의 머리 밑 면에 쎄레이션 형상을 추가하여 그 효과를 분석하였다. 쎄레이션 볼트는 풀림과정에서 피체결체 윗면을 변형시켜 풀림 방지 턱을 생성해 풀림을 방지하는 역할을 한다. 쎄레이션 개수와 체결 깊이를 변수로 하여 그 영향을 분석하고 풀림 방지 성능에 미치는 영향을 확인하였다.

Keywords

References

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