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The Study on the Variation of Friction Coefficient of Flank Lock Type Precision Locknut at the Different Tightening Speed

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Abstract:

The study investigated the variation of friction coefficient of a vertical assembly of flank lock type precision locknut at the different tightening speed by a torque and axial force test machine. The tightening speed is set at 4rpm, 6rpm and 8rpm, respectively. The lubricant is a type of 2TML. Surface morphology was observed before and after the test via an optical microscope. The experiment proceeded to five preloads to test and took the sixth as the experimental setting through the ISO 2320 specification. The study observed the variation of friction coefficient at the different tightening speed under a preload. The results show that the friction coefficient tends to be smaller when the tightening speed becomes faster. The increase of friction coefficient associates with the increase of anti-loosening ratio. For the surface morphology, it was found that the seat surface and the thread surface of the locknut generates the reaming, scraping and fatigue damage after the repeated tightening and loosening test.

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Periodical:

Applied Mechanics and Materials (Volumes 541-542)

Pages:

588-591

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.541-542.588

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Cite this paper

Online since:

March 2014

Authors:

Chih Ming Chen, Chin Huang Sun

Keywords:

Anti-Loosening Ratio, Friction Coefficient (FC), Precision Locknut, Surface Morphology

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© 2014 Trans Tech Publications Ltd. All Rights Reserved

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