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

The Korean Society of Mechanical Engineers (대한기계학회)
권호 표지
DOI QR코드

DOI QR Code

Study of Production and Material Properties of Micro Screw Using SWCH18A and SUS XM7 Materials

SWCH18A 와 SUS XM7 을 적용한 초소형 나사제작 및 물성분석에 관한 연구

  • Ra, Seung-Woo (Seoul metal Co., Ltd, Research and Development Center) ;
  • Kim, In-Rak (Seoul metal Co., Ltd, Research and Development Center) ;
  • Hwang, Sung Tack (Seoul metal Co., Ltd, Research and Development Center)
  • Received : 2014.04.21
  • Accepted : 2014.05.30
  • Published : 2014.09.01
Download PDF
⟨ Previous Next ⟩

Abstract

As micro screws feature reduced screw lengths and pitches, the resulting clamping force diminishes because of the reduced length of the actual joints. The elements of the clamping force are material, geometry, and friction. We studied the shrinking size of the screw and the methods to improve the clamping force by changing the material. We developed a micro screw using SWCH18A and SUS XM7 materials, and obtained the precision and thickness of the pitch through three-dimensional measurement. We also measured the external resistance of the micro screw by applying the Vicker's hardness test and conducted a break surface analysis using a break torque test and SEM for obtaining the break characteristics.

체결부품의 사이즈가 작아질수록 실제 접합부의 면적이 줄어들기 때문에 체결력은 감소한다. 이러한 체결부품의 체결력을 결정하는 요소는 소재(Material), 구조(Geometry), 마찰(Friction)이 있다. 본 연구에서는 체결부품의 사이즈가 줄어들면서 체결력을 향상시킬 수 있는 방법 중의 하나인 소재 변경에 대하여 연구하였다. SWCH18A 와 SUS XM7 을 적용하여 초소형 나사를 제작하였으며, 3 차원 치수 측정을 통하여 피치정밀도와 두께정밀도를 측정하였다. 비커스 경도 측정을 통하여 나사가 외부의 힘에 의해 변형에 대한 저항력을 분석하였다. 또한 파단토크 시험과 SEM 을 이용한 파단면 분석을 통해 파단특성을 분석한다.

Keywords

References

  1. Bickford, J. H., 1995, "An Introduction to the Design and Behavior of Bolted Joints," MARCEL DEKKER, INC, Third Edition, ISBN 0-8247-9297-1, pp. 239-241.
  2. Lee, B. H., Chun, H. J., Lee, S. H. and Han, J. H., 2006, "Three-Dimensional Finite Element Analysis of Stress Distribution and Preload of Different Connection Types Implant with Initial Clamping," The Korean Academy of Prosthodontics, Vol. 44, No. 2, pp.197-205.
  3. Lee, K. W., 2013, "A Study on Precise Torque Measurement System Design for Optimal Bolt Clamping Force," Graduate School, Myongji University, pp.1-10.
  4. Lee, H., K., Ra, S. W. and Kim, J. B., 2013, "Analysis of Bolt Joining Stress for Various Bit Depth," Trans. Korean Soc. Mech. Eng. A, Vol. 2013, No. 12, pp. 1811-1814.
  5. Ra, S. W., Jung, J. Y., Jang, J. M., Song, J. H., Lee, H, J., Lee, G. A. and Lee, N., K., 2010, "A Study on The Plasma Nitriding Process for Functionality of Micro Actuation Component," Korean Society for Precision Engineering, Vol. 2010, No. 5, pp. 675-676.
  6. Serope, A. and Steven, R. S., 2008, "Manufacturing Processes for Engineering Materials," Prentice Hall, 5th Edition, ISBN 978-89-450-2065-9. pp.116-124.