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The Influence of Corrosion on the Anti-Loosening Performance of a Precision Locknut Subjected to Rotation and Periodic Impact

Published online by Cambridge University Press:  10 December 2019

C. M. Chen Open the ORCID record for C. M. Chen [Opens in a new window] ,
H. L. Chang  and
C. Y. Lee
C. M. Chen*
Affiliation:
Department of Mechanical Engineering, National Chin-Yi University of Technology, Taichung, Taiwan
H. L. Chang
Affiliation:
Department of Chemical and Materials Engineering, National Chin-Yi University of Technology, Taichung, Taiwan
C. Y. Lee
Affiliation:
Graduate Institute of Manufacturing Technology, National Taipei University of Technology, Taipei, Taiwan
*
*Corresponding author ([email protected])
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Abstract

The influence of combined corrosion and vibration to the anti-loosening performance of a precision locknut used in a machine tool is investigated. Firstly, the locknut was submerged in 5% NaCl solution according to ASTM B895 standard for corrosion testing. The locknuts, after submerged in 1-hr, 2-hr and 4-hr periods, respectively, were then installed on the rotating spindle in a vertical dynamic impact tester for performing anti-loosening test. The initial installed pretension was 9800 N and the spindle was rotating in a constant speed of 1000 rpm. Turmogrease Li 802 EP lubricant was used on the contact surface between spindle thread and locknut. The set screws on the locknut were tightened sequentially and evenly in three-stage of torque: 1.96 N-m, 3.92 N-m and 5.88 N-m. Its real-time pretension variation with the periodic transverse impact and its final loosening torque were measured. Accordingly, the axial force ratio and anti-loosening torque ratio were calculated and discussed. It was found that corrosion treatment had similar influence on both the axial force ratio and the anti-loosening torque ratio. More corrosion on the locknut with longer submersion in NaCl solution deteriorated its anti-loosening characteristics. The result could serve as the reference for evaluating the fastening performance of precision locknut and guide the design and manufacturing for the application improvement.

Keywords

Corrosionaxial force ratioanti-loosening ratiodynamic anti-loosening testerprecision locknut
Type
Research Article
Information
Journal of Mechanics , Volume 36 , Issue 3 , June 2020 , pp. 295 - 303
Copyright
Copyright © 2019 The Society of Theoretical and Applied Mechanics

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References

REFERENCES

Bhattacharya, A., Sen, A. and Das, S., “An investigation on the anti-loosening characteristics of threaded fasteners under vibratory conditions,” Mechanism and Machine Theory, 45, pp. 1215–1225 (2010).CrossRefGoogle Scholar
Eccles, W., Sherrington, I. and Arnell, R. D., “Frictional changes during repeated tightening of zinc plated threaded fasteners,” Tribology International, 43, pp. 700–707 (2010).CrossRefGoogle Scholar
Croccolo, D., Agostinis, M. D., Vincenzi, N., “Failure analysis of bolted joints: Effect of friction coefficients in torque-preloading relationship,” Engineering Failure Analysis, 18, pp. 364–373 (2011).CrossRefGoogle Scholar
Hess, D. P., Sanclemente, J. A., “Parametric study of threaded fastener loosening due to cyclic transverse loads,” Engineering Failure Analysis, 14, pp. 239–249 (2007).Google Scholar
Taghizadeh, H., Chakherlou, T. N., Ghorbani, H. and Mohammadpour, A., “Prediction of fatigue life in cold expanded fastener holes subjected to bolt tightening in Al alloy 7075-T6 plate,” International Journal of Mechanical Sciences, 90, pp. 6–15 (2015).CrossRefGoogle Scholar
Ibrahim, R. A. and Pettit, C. L., “Uncertainties and dynamic problems of bolted joints and other fasteners,” Journal of Sound and Vibration, 279, pp. 857–936 (2005).CrossRefGoogle Scholar
Sase, N., Nishioka, K., Koga, S. and Fujii, H., “An anti-loosening screw-fastener innovation and its evaluation,” Journal of Materials Processing Technology, 77, pp. 209–215 (1998).CrossRefGoogle Scholar
Sase, N. and Fujii, H., “Optimizing study of SLBs for higher anti-loosening performance,” Journal of Materials Processing Technology, 119, pp. 174–179 (2001).CrossRefGoogle Scholar
Chen, C. M. and Lee, C. Y., “Optimization on the performance of a precision flank-locking locknut considering the machining and operational parameters”, Journal of Mechanics, 35(1), pp. 41–49 (2019).CrossRefGoogle Scholar
Chiang, M. F., Hsu, H. H., Young, M. C. and Huang, J. Y., “Mechanical degradation of cold-worked 304 stainless steel in salt spray environments,” Journal of Nuclear Materials, 422, pp. 58–68 (2012).CrossRefGoogle Scholar
Jha, A. K., Manwatkar, S. and Sreekumar, K., “Hydrogen-induced intergranular stress corrosion cracking (HI-IGSCC) of 0.35C-3.5Ni-1.5Cr-0.5Mo steel fastener,” Engineering Failure Analysis, 17, pp.777–786 (2010).CrossRefGoogle Scholar
Jha, A. K., Kiranmayee, M. S. and Manwatkar, S. K., “Failure analysis of maraging steel fasteners used in nozzle assembly of solid propulsion system,” Engineering Failure Analysis, 27, pp. 308–313 (2013).CrossRefGoogle Scholar
Chen, C. M. and Sun, C. H., “A study of surface characteristics of flank lock type precision locknut under a vertical installation”, Journal of Mechanics, 34(1), pp. 47–58 (2018).CrossRefGoogle Scholar
ASTM B895, “Standard Test Methods for Evaluating the Corrosion Resistance of Stainless Steel Powder Metallurgy(PM) parts/Specimens by Immersion in a Sodium Chloride Solution,” (2016).Google Scholar
ISO 2320, “Fasteners - Prevailing torque steel nuts -Functional properties,” (2015).Google Scholar
Fink, F. W. and Boyd, W. K., “The Corrosion of Metals in Marine Environments,” Bayer & Co., Columbus (1970).Google Scholar