Failure analysis of input pinion shafts and intermediate pinion shaft of sugar crushing mills

Sujata, M and Madan, M and Biswas, Swati and Ganeshachar, MD and Venkataswamy, MA and Bhaumik, SK (2007) Failure analysis of input pinion shafts and intermediate pinion shaft of sugar crushing mills. Project Report. National Aerospace Laboratories, Bangalore, India.

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Abstract

Two input pinion shafts and one 1st intermediate pinion shaft used in gearboxes of sugar-crushing mills were reported to have failed prematurely after about 3,600 hr of service against a specified life of 100,000 hr. These shafts were referred to the laboratory for analyzing the cause of failure. Investigation revealed that the pinions have failed by surface contact fatigue/spalling due to low surface hardness and unusual hardness profile on the teeth. Examination also revealed non-uniform case depth and surface hardness from one tooth to another. Studies showed that improper heat treatment of the components was responsible for such metallurgical abnormalities leading to premature failure of the pinions. A detailed analysis of the failure is presented in this report. A few recommendations are also suggested to prevent recurrence of similar failures.

Item Type: Proj.Doc/Technical Report (Project Report)
Uncontrolled Keywords: Pinion;Surface contact fatigue;Metallurgical abnormalities; Improper heat treatment
Subjects: AERONAUTICS > Aeronautics (General)
CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Division/Department: Materials Science Division, Materials Science Division, Other, Other, Materials Science Division, Materials Science Division
Depositing User: Ms. Alphones Mary
Date Deposited: 29 Jul 2011 11:16
Last Modified: 29 Jul 2011 11:16
URI: http://nal-ir.nal.res.in/id/eprint/9573

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