Bending fatigue strength of spur gear subject to re-fine particle peening in fatigue process

2021 ◽  
Vol 2021.59 (0) ◽  
pp. 05a2
Author(s):  
Yuuki ISHIMOTO ◽  
Jyunpei YAMANE ◽  
Yuichi ONO
Keyword(s):  
Fatigue Strength ◽  
Fine Particle ◽  
Spur Gear ◽  
Bending Fatigue ◽  
Fatigue Process ◽  
Bending Fatigue Strength

Bending Strength of Carburized Forged Spur Gear

2007 ◽  
Author(s):  
Masashi Yamanaka ◽  
Shinji Miwa ◽  
Katsumi Inoue ◽  
Yoshiki Kawasaki
Keyword(s):  
Fatigue Strength ◽  
Fatigue Test ◽  
Bending Strength ◽  
Surface Hardness ◽  
Spur Gear ◽  
Bending Fatigue ◽  
Precision Forging ◽  
Bending Fatigue Test ◽  
Bending Fatigue Strength ◽  
Gear Profile

This paper deals with the evaluation of influence of the manufacturing methods precision forging and conventional hobbing on the bending fatigue strength of carburized gears. The forging has advantages in productivity and strength. The forged gear has a continuous directed fiber flow which runs along the gear profile. To clarify the effect of strength enhancement, a bending fatigue test is performed for the forged and the hobbed gears. The material of test gears is SCr420H in the JIS and all gears are carburized. The electrohydraulic servo-controlled fatigue tester is used in the constant stress-amplitude fatigue test. The strength is expressed by the fillet stress level, which is calculated by FEM. The obtained strengths of forged and hobbed gear are 1613 MPa and 1490 MPa, respectively. The strength of forged gear is increased 8% in comparison with that of the hobbed gear. The surface hardness is higher and the surface roughness is smaller in the forged gear, however, the residual stress is approximately same. The effect of improvement of the roughness by forging on the strength is small in 1%, and the main reason of the improvement of fatigue strength is considered as the continuous fiber flow.

The Evaluation of Bending Fatigue Testing of Austempered Ductile Iron Spur Gear

2019 ◽  
Author(s):  
Qi Zhang ◽  
Jianhua Lv ◽  
Rizwanulhaque Syed ◽  
Jing Zhang ◽  
Yang Xu ◽  
...  
Keyword(s):  
Fatigue Strength ◽  
Ductile Iron ◽  
Fatigue Testing ◽  
Spur Gear ◽  
Austempered Ductile Iron ◽  
Spur Gears ◽  
Reliability Design ◽  
Bending Fatigue ◽  
Bending Fatigue Strength ◽  
Number Of Cycles

Abstract An experimental evaluation of bending fatigue strength for austempered ductile iron (ADI) spur gears have been performed using Zwick fatigue tester. The gear material was manufactured by vertically continuous casting, in which the radius of the graphite grains is smaller. The Stress-Number of Cycles curve (S-N curve) for the bending fatigue strength of the ADI spur gears are manufactured without any specific surface treatments, and have been obtained by post-processing software. It was observed that when the reliability was 50%, the fatigue limit was 304.89 MPa. It has provided a reliable basis to rate the reliability design of the small gearboxes in automation later.

S1103-3-3 Effect of Fine Particle Bombarding on Bending Fatigue Strength of Gears

2010 ◽  
Vol 2010.4 (0) ◽  
pp. 107-108 ◽  
Author(s):  
Takao KOIDE ◽  
Hatsuhiko USAMI ◽  
Kouitsu MIYACHIKA ◽  
Koji TSUBOKURA
Keyword(s):  
Fatigue Strength ◽  
Fine Particle ◽  
Bending Fatigue ◽  
Bending Fatigue Strength

B04 Effect of Fine Particle Bombarding on Bending Fatigue Strength of Gears

2008 ◽  
Vol 2008 (0) ◽  
pp. 53-54
Author(s):  
Takao KOIDE ◽  
Hatsuhiko USAMI ◽  
Kouitsu MIYACHIKA ◽  
Koji TSUBOKURA
Keyword(s):  
Fatigue Strength ◽  
Fine Particle ◽  
Bending Fatigue ◽  
Bending Fatigue Strength

scholarly journals Effects of Surface Treatment on the Bending Fatigue Strength of Carburized Spur Gear.

1994 ◽  
Vol 60 (572) ◽  
pp. 1391-1396 ◽  
Author(s):  
Sung-Ki Lyu ◽  
Katsumi Inoue ◽  
Masana Kato ◽  
Masazumi Onisi ◽  
Kenji Shimoda
Keyword(s):  
Fatigue Strength ◽  
Surface Treatment ◽  
Spur Gear ◽  
Bending Fatigue ◽  
Bending Fatigue Strength

Residual Stress and Bending Fatigue Strength of Case-Carburized Thin-Rimmed Spur Gears With Asymmetric Web Arrangement

2007 ◽  
Author(s):  
Kouitsu Miyachika ◽  
Wei-Dong Xue ◽  
Takao Koide ◽  
Hidefumi Mada ◽  
Kengo Nojima ◽  
...  
Keyword(s):  
Residual Stress ◽  
Fatigue Strength ◽  
Three Dimensional ◽  
Spur Gear ◽  
Fatigue Tests ◽  
Case Depth ◽  
Spur Gears ◽  
3D Fem ◽  
Bending Fatigue ◽  
Bending Fatigue Strength

This paper presents a study on effects of carburized parts on residual stress and bending fatigue strength of case-carburized thin-rimmed spur gears with asymmetric web arrangement. A heat conduction analysis and an elastic-plastic stress analysis for the case-carburizing process of thin-rimmed spur gears with asymmetric web arrangement were carried out by the three-dimensional finite-element method (3D-FEM), and then residual stresses were obtained. Effects of the case depth, the carburized part and the rim thickness on the residual stress of case-carburized thin-rimmed spur gears were determined. Bending fatigue tests were carried out for case-carburized thin-rimmed spur gears with asymmetric web arrangement, and S-N curves and bending fatigue limit loads were obtained. Effects of the case-depth, the carburized part and the rim thickness on the bending fatigue strength of the case-carburized thin-rimmed spur gear with asymmetric web arrangement were determined.

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