Effects of Side-Face Carburizing, Face Width, Tempering and Intergranular Oxidation on Bending Fatigue Strength of Case-Carburized Gear

Volume 8: Mechanics of Solids, Structures and Fluids ◽

10.1115/imece2012-86492 ◽

2012 ◽

Author(s):

Kouitsu Miyachika ◽

Norimasa Maeta

Keyword(s):

Fatigue Strength ◽

Hardened Layer ◽

Case Depth ◽

Bending Fatigue ◽

Face Width ◽

Intergranular Oxidation ◽

Bending Fatigue Test ◽

Side Face ◽

Bending Fatigue Strength ◽

Carburized Gear

The hardness measurements of hardened layer, the observation of intergranular oxidation with the SEM and the bending fatigue test for gas and vacuum case-carburized spur gears were carried out, and then profiles of hardened layer, case depth, amount of intergranular oxidation and S-N curves were obtained. Effects of the case depth, the side-face carburizing, the face width, the tempering and the intergranular oxidations on the bending fatigue strength were determined.

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Effects of case depth, face width and intergranular oxidation on bending fatigue strength of case-carburized SNC815 and SCM415 steel spur gears

International Gear Conference 2014: 26th–28th August 2014, Lyon ◽

10.1533/9781782421955.950 ◽

2014 ◽

pp. 950-958 ◽

Cited By ~ 1

Author(s):

K. Miyachika ◽

T. Ikuta ◽

N. Maeta ◽

H. Mada

Keyword(s):

Fatigue Strength ◽

Case Depth ◽

Spur Gears ◽

Bending Fatigue ◽

Face Width ◽

Intergranular Oxidation ◽

Bending Fatigue Strength

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Effects of Heating Time, Electric Power and Frequency on Bending Fatigue Strength of Induction Hardened Gears

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.118.527 ◽

2006 ◽

Vol 118 ◽

pp. 527-532 ◽

Cited By ~ 1

Author(s):

Kouitsu Miyachika ◽

Kazuteru Oda ◽

Hideaki Katanuma ◽

Jun Iwanaga ◽

Satoshi Oda

Keyword(s):

Fatigue Strength ◽

Electric Power ◽

Fatigue Test ◽

Hardened Layer ◽

Heating Time ◽

Bending Fatigue ◽

Bending Fatigue Test ◽

Optimum Heating ◽

Bending Fatigue Strength ◽

Micro Structures

The measurement of hardened layer and the bending fatigue test of S35C and S45C steel gears induction-hardened under various heating conditions were carried out, and then profiles of hardened layer and S-N curves (bending fatigue strength) were obtained. Effects of the heating time, the electric power and the frequency on profiles and micro-structures of hardened layers of gears were examined. Relationship between the bending fatigue strength and the profile of hardened layer was determined. Optimum heating conditions for the bending fatigue strength of induction-hardened S35C and S45C steel gears were indicated.

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Effects of Case Depth, Side-Face Carburizing and Helix Angle on Residual Stress and Bending Fatigue Strength of Case-Carburized Helical Gears

Volume 6: ASME Power Transmission and Gearing Conference; 3rd International Conference on Micro- and Nanosystems; 11th International Conference on Advanced Vehicle and Tire Technologies ◽

10.1115/detc2009-87313 ◽

2009 ◽

Author(s):

Kouitsu Miyachika ◽

Kazuaki Ando ◽

Wei-Dong Xue ◽

Imaduddin Helmi Bin Wan Nordin

Keyword(s):

Residual Stress ◽

Fatigue Strength ◽

Three Dimensional ◽

Helix Angle ◽

Fatigue Tests ◽

Case Depth ◽

Bending Fatigue ◽

Helical Gears ◽

Side Face ◽

Bending Fatigue Strength

This paper presents a study on effects of case depth, side-face carburizing and helix angle on the residual stress and the bending fatigue strength of case-carburized helical gears. The carbon content of each element of the FEM gear models due to carburizing was obtained. A heat conduction analysis and an elastic-plastic stress analysis in the case-carburizing process of helical gears were carried out by the three-dimensional finite-element method, and then residual stresses were obtained. Effects of the case depth, the side-face carburizing, the helix angle and the face width on the residual stress of case-carburized helical gears were determined. Bending fatigue tests were carried out for case-carburized helical gears and S-N curves and bending fatigue limit loads were obtained. Effects of the case-depth, the side-face carburizing and the helix angle on the bending fatigue strength of the case-carburized helical gear were determined.

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Bending Strength of Carburized Forged Spur Gear

Volume 7: 10th International Power Transmission and Gearing Conference ◽

10.1115/detc2007-34882 ◽

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.

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