Failure of a helical gear in a power plant

Netpu, Samroeng; Srichandr, Panya

doi:10.1016/j.engfailanal.2013.03.002

Cited by 21 publications

(11 citation statements)

References 5 publications

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“…Pitting, sharp notches, surface deteriorations, poor machining and grinding marks are examples of stress raisers at the surface. Internally initiated fatigue cracks due to faulty materials and poor heat treatment practice, such as inclusions and other inhomogeneities, are rare [5][6][7]. In this case, the microstructure, hardness, carburized depth and roughness are all satisfactory and within the specification.…”

Section: Discussionmentioning

confidence: 99%

Failure Analysis on Input Gear of a Gearbox

Liu¹,

Zhang²,

Xing³

2018

Proceedings of the 2018 8th International Conference on Manufacturing Science and Engineering (ICMSE 2018)

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Abstract.A tooth of the input helical gear of an intermediate gearbox in a helicopter fractured during testing. In order to find out the failure mode and cause, macro and micro observation, hardness and carburized depth testing, microstructure examination, surface roughness and round angle testing were carried out. The results show that the failure mode of the gear is fatigue failure . The crack initiated from the round angle of the tooth root at the working-face side. The round angle radius is smaller than the requried value, leading to the increase of stress concentration, which is the main cause for the fatigue fracture of the tooth. The machining process of the round angles should be concisely controlled so that such failure can be avoided.

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Section: Discussionmentioning

confidence: 99%

Failure Analysis on Input Gear of a Gearbox

Liu¹,

Zhang²,

Xing³

2018

Proceedings of the 2018 8th International Conference on Manufacturing Science and Engineering (ICMSE 2018)

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“…Methods from the non-destructive testing group and quality management tools were used in the model because they are preferred in casting quality control and quality problem analysis. Many cited literature items confirm the effectiveness of applying the considered methods individually [ 41 , 85 , 86 , 87 , 88 , 89 , 90 , 93 , 94 , 95 , 96 , 97 ].…”

Section: Modelmentioning

confidence: 94%

Model of Diagnosing and Searching for Incompatibilities in Aluminium Castings

Pacana

Czerwińska

2021

Materials

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An essential element of any industry is castings, which is determined by the technical conditions for their reception. However, conducting production in the foundry technology is burdened with many difficulties associated with, for example, the inability to control all of the parameters that may affect the casting quality. Therefore, it is essential to undertake improvement actions in this area. Efforts are being made to use non-destructive testing (NDT) as a part of quality control, but these methods are rarely combined in a single diagnostic run. As a part of quality improvement, it is also essential to identify the root cause of the problem. For this reason, it is justified to develop a model of diagnosing and searching for non-conformities, which would combine NDT tests and quality management tools. The model included the visual, ultrasound, and eddy current examination in the diagnostic part, and the Pareto–Lorenz diagram correlated with ABC method, histogram, and 5WHY method (asking five questions why). The study’s originality is manifested in the combination of several NDT methods with quality management methods in one model. Using integrally configured methods in the proposed model, it was possible to: reduce diagnostic uncertainty, characterize the critical group of non-conformities, and identify the root causes of the quality problem. The model is a new and universal method that can be implied in any foundry company in order to ensure the stability of the production processes. The application of the model contributes to an increase in the detection speed and enables the reduction of non-conformities in aluminium castings, thus increasing the quality level of the offered products.

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“…Over the past several years, analyses have been conducted on the failure of gears of different mechanical systems. It has been reported that the majority of gear failures have occurred because of manufacturing and operational error of gears and gearboxes, respectively [12][13][14][15][16][17][18]. However, bending fatigue [19,20], wear and surface contact fatigue [21,22], and design faults [23,24] have also contributed significantly to failure.…”

Section: Introductionmentioning

confidence: 99%

Pinion Failure Analysis of a Helical Reduction Gearbox in a Kraft Process

Pandey

Lim

2020

Applied Sciences

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This paper reports investigations related to addressing the cause of pinion teeth deformation of a helical reduction gearbox in a kraft process. The American Gear Manufacturers Association (AGMA) design methodology was employed to determine the safety factor under bending and surface fatigue strengths of a pinion and gear at two operating loads (3 and 3.75 MW). In addition, finite element analysis (FEA) of the pinion and gear assembly was also performed to check the misalignment (due to deformation) at 3.75 MW load. Based on the investigations presented herein, it is found that the pinion portion near the thrust disc became excessively deformed at the axial thrust corresponding to the 3.75 MW load, causing misalignment that resulted in the plastic deformation of the pinion teeth.

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Failure of a helical gear in a power plant

Cited by 21 publications

References 5 publications

Failure Analysis on Input Gear of a Gearbox

Failure Analysis on Input Gear of a Gearbox

Model of Diagnosing and Searching for Incompatibilities in Aluminium Castings

Pinion Failure Analysis of a Helical Reduction Gearbox in a Kraft Process

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