한국정밀공학회지 (Journal of the Korean Society for Precision Engineering)

  • 제34권2호
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  • Pages.89-94
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  • 2017
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  • 1225-9071(pISSN)
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  • 2287-8769(eISSN)
한국정밀공학회 (Korean Society for Precision Engineering)
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금형설계 변수에 따른 마이크로 티타늄 나사 전조공정의 성형 특성 고찰

An Investigation of Thread Rolling Characteristics of Titanium Micro-Screws according to Die Design Parameters

  • 이지은 (서울과학기술대학교 기계시스템디자인공학과) ;
  • 김종봉 (서울과학기술대학교 기계자동차공학과) ;
  • 박근 (서울과학기술대학교 기계시스템디자인공학과)
  • Lee, Ji Eun (Department of Mechanical System and 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 and Design Engineering, Seoul National University of Science and Technology)
  • 투고 : 2016.11.22
  • 심사 : 2016.12.28
  • 발행 : 2017.02.01
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초록

Micro-screws can be defined by their outer diameter of generally less than 1 mm. They are manufactured by head forging and thread rolling processes. In this study, the thread rolling process was numerically analyzed for a micro-screw with a diameter and pitch of 0.8 and 0.2 mm, respectively. Through finite element (FE) analysis, the effects of two design parameters (die gap and chamfer height) on the dimensional accuracy were investigated. Three combinations of chamfer heights were chosen first and the corresponding die gap candidates selected by geometric calculation. FE analyses were performed for each combination and their results indicated that the concave chamfer height should be less than 0.3 mm, while a 10 ?m difference in the die gap might cause degeneration in dimensional accuracy. These results conclude that ultra-high accuracy is required in die fabrication and assemblies to ensure dimensional accuracy in micro-screw manufacturing.

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참고문헌

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