000			02687cam a2200313 a 4500
003			EG-GiCUC
008			190115s2018 ua h f m 000 0 eng d
040			_aEG-GiCUC _beng _cEG-GiCUC
041	0		_aeng
049			_aDeposite
097			_aPh.D
099			_aCai01.13.13.Ph.D.2018.Ra.F
100	0		_aRaafat Ibrahim Mohamed Goher
245	1	0	_aFailure analysis and modifications of carburized gears / _cRaafat Ibrahim Mohamed Goher ; Supervised Mahmoud Mohamed Abdrabou , Badr Shaaban Azzam
246	1	5	_aتحليل انهيارات التروس ذات التصليد الغلافى الكربونى و تطويرها
260			_aCairo : _bRaafat Ibrahim Mohamed Goher , _c2018
300			_a119 P. : _bfacsimiles ; _c30cm
502			_aThesis (Ph.D.) - Cairo University - Faculty of Engineering - Department of Mechanical Design and Production
520			_aThe mechanical failure mainly concentrated in; material selection errors, design errors, production error and heat treatment errors with about 79% of the total failure causes. Gear failure is one of the most important problems facing the gears{u2019} designers, manufacturers and maintenance team. Gear failure may occur due to the errors in design, manufacturing, operating conditions or maintenance. Design errors may also come due to errors in stress analysis, material selection, geometry analysis or heat treatment specifications. Manufacturing errors may be result from the machining accuracy and/or errors, geometrical errors, heat treatment errors, finishing errors or assembly errors. In this work, three industrial gear failure cases were studied and analyzed. It was found that the most failure cases were resulting from the heat treatment specifications, implementation or design analysis. So, the study was aimed to analyzing the failure cases searching for its causes and introducing solutions to the discovered failure causes. The failure studied cases, were made of carburized materials so; the carburization technique of surface hardening was applied. The studied cases material was DIN 1.6587 (17NiCrMo 7-6). The failure reason of the first and second cases were due to errors of; the carburizing depth either less or more than the correct values and decarburization. Those errors were studied and solved. Whereas, the third failure case was due to the high applied stress to the gears
530			_aIssued also as CD
653		4	_aCarburizing
653		4	_aDecarburization
653		4	_aGears failur
700	0		_aBadr Shaaban Azzam , _eSupervisor
700	0		_aMahmoud Mohamed Abdrabou , _eSupervisor
905			_aNazla _eRevisor
905			_aSamia _eCataloger
942			_2ddc _cTH
999			_c69595 _d69595