[ Papers ]

Journal of the Korean Society of Manufacturing Technology Engineers - Vol. 27, No. 5, pp.409-416

ISSN: 2508-5107 (Online)

Print publication date 15 Oct 2018

Received 17 Jul 2018 Revised 15 Aug 2018 Accepted 17 Aug 2018

DOI: https://doi.org/10.7735/ksmte.2018.27.5.409

건식윤활코팅이 볼트 마찰계수에 미치는 영향

정현수^a^{, *} ; 한혜선^a ; 김준수^a ; 김기승^a

Effect of Dry Film Lubricant on Friction Coefficient in Bolts

Hyun Su Jung^a^{, *} ; Hye Sun Han^a ; Jun Su Kim^a ; Ki Seung Kim^a

aAISR Mechanical R&D Lab, LIGNex1 Co. Ltd., 207, Mabuk-ro, Giheung-gu, Yongin, Gyeonggi-do, 16911, Korea

Correspondence to: ^*Tel.: +82-31-288-9468 fax: +82-31-288-9122 E-mail address: Hyunsu.Jung@lignex1.com (Hyun Su Jung).

Abstract

Dry film lubricants are used in Martian probes, artificial roller bearings, and power transmitters for infrared detectors. This study experimentally investigates the effect of a dry film lubricant on the thread, head friction coefficient, and torque–tension relationship in M5 and M6 bolts. Tests were conducted by combining the bolts with a hexagon flange nut and hexagon flange locking nut, and the test apparatus collected real-time data on the tightening torques, bolt axial forces, and corresponding reaction torques. The test data were then used to calculate the thread and head friction coefficients. The test results show the changes in friction coefficients of dry film lubricated bolts during tightening. This work will have significant influence on the reliability and safety of dry film lubricated bolt joint structures in many mechanical structural systems.

Keywords:

Bolt, Dry film lubricant, Friction coefficient, Torque-tension relationship

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