The Effect of Immersion Corrosion on the Surface Morphology of a Flank-Locking Precision Locknut
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Precision locknuts are widely used in rotary machinery especially the machine tools operating in high speed with high precision. The flank-locking locknut studied in this paper is mainly employed in spindle and ball screw assemblies of machine tools to secure the preloading in the bearings required for better structural stiffness. In service the locknuts often suffer corrosion from the harsh machining environment. The possible effects of corrosion on the surface morphology of locknut, such as flatness and roughness, and its performance were investigated. The locknut was submerged in a 5% NaCl solution following ASTM B895 standard for different durations- 1, 2, and 4 h to speed up the possible corrosion. The treated locknut was then undergone assembling test following ISO 2320 standard. The flatness and roughness on the end face and threads were measured along with microscopic examination. It was found that with increasing duration of corrosion, the surface flatness and roughness became worse. However, the tightening constant of the locknut showed a positive correlation with the increased surface roughness raised by the corrosion treatment.
KeywordsSurface roughness Thread surface roughness Immersion corrosion Assembling test Surface morphology Flank-locking locknut
The financial support from Ministry of Science and Technology, Taiwan for this study is gratefully acknowledged.
Compliance with Ethical Standards
Conflict of Interest
On behalf of all authors, the corresponding author states that there is no conflict of interest.
- 5.Zou Q, Sun TS, Nassar SA, Barber GC, Gumul AK (2006) Effect of lubrication on friction and torque-tension relationship in threaded fasteners. In STLE/ASME International Joint Tribology Conference San Antonio, Texas, USA https://doi.org/10.1080/10402000601105490
- 9.Chen CM, Chen CH (2014) Discussion the re-use precision locknut of the machine tools spindle in the vertical assembly characteristics. Adv Mater Res 853:441–446. https://doi.org/10.4028/www.scientific.net/AMR.853.441 CrossRefGoogle Scholar
- 12.Yue T, Wahab MA (2017) Roughness Effects on Fretting Fatigue. 6th International Conference on Fracture Fatigue and Wear 843:012056. https://doi.org/10.1088/1742-6596/843/1/012056
- 14.Alvarez RB, Martin HJ, Horstemeyer MF, Chandler MQ, Williams N, Wang PT, Ruiz A (2010) Corrosion relationships as a function of time and surface roughness on a structural AE44 magnesium alloy. 52:1635–1648. https://doi.org/10.1016/j.corsci.2010.01.018
- 22.Spotts MF (1989) Design of Machine Elements, sixth edn. Prentice-Hall, New JerseyGoogle Scholar
- 23.Shigley JE, Mischke CR (1995) Mechanical engineering design, 5th edn. McGraw-Hill, New YorkGoogle Scholar
- 25.ASTM B895 (2016) Standard Test Methods for Evaluating the Corrosion Resistance of Stainless Steel Powder Metallurgy(PM) parts/Specimens by Immersion in a Sodium Chloride SolutionGoogle Scholar
- 26.ISO 2320 (2015) Fasteners - Prevailing torque steel nuts - Functional propertiesGoogle Scholar
- 27.Prabhakaran S, Kulkarni A, Vasanth G, Kalainathan S, Shukla P, Vasudevan VK (2018) Laser shock peening without coating induced residual stress distribution, wettability characteristics and enhanced pitting corrosion resistance of austenitic stainless steel. Appl Surf Sci 428:17–30. https://doi.org/10.1016/j.apsusc.2017.09.138 CrossRefGoogle Scholar
- 29.Benedetti MD, Loreto G, Matta F, Nanni A (2013) Acoustic emission monitoring of reinforced concrete under accelerated corrosion. J Mater Civ Eng 25(8):1022–1029. https://doi.org/10.1061/(ASCE)MT.1943-5533.0000647 CrossRefGoogle Scholar