This study investigates the effect of shot-peening on the bearing friction coefficient of 42CrMoV grade 14.9 screws. An experimental campaign was conducted on a tribological testing rig, investigating the combined effects of shot peening treatments, lubrication conditions, and number of tightenings on the frictional coefficient. A first set of tests was performed, considering the same shot-peening conditions as in a previous study to highlight the role of different material. A second campaign was carried out, adjusting the process parameters to enhance the tribological response. Small shots and high-impact energy are suitable for tightening with lubricant, whereas, in dry conditions, larger shots and lower-impact energy lead to particularly low friction coefficients that are well aligned to those achievable when using lubricants.
Croccolo D., De Agostinis M., Fini S., Mele M., Olmi G. (2023). Effect of different underhead shot-peening and lubrication conditions on high-strength screws undergoing multiple tightenings. TRIBOLOGY INTERNATIONAL, 188, 1-10 [10.1016/j.triboint.2023.108874].
Effect of different underhead shot-peening and lubrication conditions on high-strength screws undergoing multiple tightenings
Croccolo D.;De Agostinis M.;Fini S.;Mele M.
;Olmi G.
2023
Abstract
This study investigates the effect of shot-peening on the bearing friction coefficient of 42CrMoV grade 14.9 screws. An experimental campaign was conducted on a tribological testing rig, investigating the combined effects of shot peening treatments, lubrication conditions, and number of tightenings on the frictional coefficient. A first set of tests was performed, considering the same shot-peening conditions as in a previous study to highlight the role of different material. A second campaign was carried out, adjusting the process parameters to enhance the tribological response. Small shots and high-impact energy are suitable for tightening with lubricant, whereas, in dry conditions, larger shots and lower-impact energy lead to particularly low friction coefficients that are well aligned to those achievable when using lubricants.| File | Dimensione | Formato | |
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2023 - Effect of different underhead shot-peening and lubrication conditions on high-strength screws undergoing multiple tightenings -.pdf
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