Causal analysis of the pinion teeth failure in a limestone Reclaimer
This paper presents a causal analysis of an unexpected failure of the pinion teeth of a large reducer installed in a limestone reclaimer which is part of a raw material transportation system of a cement factory. The Montano methodology is applied. It includes a collection of documentation, evidences...
- Autores:
-
Castellanos, L M
Cabello, J J
Sagastume, A
Martínez, V L
Ortiz, A E
- Tipo de recurso:
- Article of journal
- Fecha de publicación:
- 2020
- Institución:
- Corporación Universidad de la Costa
- Repositorio:
- REDICUC - Repositorio CUC
- Idioma:
- eng
- OAI Identifier:
- oai:repositorio.cuc.edu.co:11323/6545
- Acceso en línea:
- https://hdl.handle.net/11323/6545
https://repositorio.cuc.edu.co/
- Palabra clave:
- Pinion teeth
Failure in a limestone
Reclaimer
- Rights
- openAccess
- License
- CC0 1.0 Universal
| id |
RCUC2_310c04dedb6f55dc90106d434d0b296c |
|---|---|
| oai_identifier_str |
oai:repositorio.cuc.edu.co:11323/6545 |
| network_acronym_str |
RCUC2 |
| network_name_str |
REDICUC - Repositorio CUC |
| repository_id_str |
|
| dc.title.spa.fl_str_mv |
Causal analysis of the pinion teeth failure in a limestone Reclaimer |
| title |
Causal analysis of the pinion teeth failure in a limestone Reclaimer |
| spellingShingle |
Causal analysis of the pinion teeth failure in a limestone Reclaimer Pinion teeth Failure in a limestone Reclaimer |
| title_short |
Causal analysis of the pinion teeth failure in a limestone Reclaimer |
| title_full |
Causal analysis of the pinion teeth failure in a limestone Reclaimer |
| title_fullStr |
Causal analysis of the pinion teeth failure in a limestone Reclaimer |
| title_full_unstemmed |
Causal analysis of the pinion teeth failure in a limestone Reclaimer |
| title_sort |
Causal analysis of the pinion teeth failure in a limestone Reclaimer |
| dc.creator.fl_str_mv |
Castellanos, L M Cabello, J J Sagastume, A Martínez, V L Ortiz, A E |
| dc.contributor.author.spa.fl_str_mv |
Castellanos, L M Cabello, J J Sagastume, A Martínez, V L Ortiz, A E |
| dc.subject.spa.fl_str_mv |
Pinion teeth Failure in a limestone Reclaimer |
| topic |
Pinion teeth Failure in a limestone Reclaimer |
| description |
This paper presents a causal analysis of an unexpected failure of the pinion teeth of a large reducer installed in a limestone reclaimer which is part of a raw material transportation system of a cement factory. The Montano methodology is applied. It includes a collection of documentation, evidences, evaluation of failure mechanism by visual inspection and some hypothesis and their validation based on the analysis of the material resistance. It is demonstrated that although the teeth of the pinion were made of a suitable material and cemented correctly, they worked overloaded due to the presence of large rocks in the raw material. A resulting increase of contact tensions in the teeth over the allowed limits led to a fatigue failure process which is described in this work. The results of the analysis can be of great interest in order to develop preventive measures and avoid future undesired plant stoppages and economic losses. |
| publishDate |
2020 |
| dc.date.accessioned.none.fl_str_mv |
2020-07-13T18:45:04Z |
| dc.date.available.none.fl_str_mv |
2020-07-13T18:45:04Z |
| dc.date.issued.none.fl_str_mv |
2020 |
| dc.type.spa.fl_str_mv |
Artículo de revista |
| dc.type.coar.fl_str_mv |
http://purl.org/coar/resource_type/c_2df8fbb1 |
| dc.type.coar.spa.fl_str_mv |
http://purl.org/coar/resource_type/c_6501 |
| dc.type.content.spa.fl_str_mv |
Text |
| dc.type.driver.spa.fl_str_mv |
info:eu-repo/semantics/article |
| dc.type.redcol.spa.fl_str_mv |
http://purl.org/redcol/resource_type/ART |
| dc.type.version.spa.fl_str_mv |
info:eu-repo/semantics/acceptedVersion |
| format |
http://purl.org/coar/resource_type/c_6501 |
| status_str |
acceptedVersion |
| dc.identifier.issn.spa.fl_str_mv |
1757-8981 1757-899X |
| dc.identifier.uri.spa.fl_str_mv |
https://hdl.handle.net/11323/6545 |
| dc.identifier.doi.spa.fl_str_mv |
doi:10.1088/1757-899X/844/1/012027 |
| dc.identifier.instname.spa.fl_str_mv |
Corporación Universidad de la Costa |
| dc.identifier.reponame.spa.fl_str_mv |
REDICUC - Repositorio CUC |
| dc.identifier.repourl.spa.fl_str_mv |
https://repositorio.cuc.edu.co/ |
| identifier_str_mv |
1757-8981 1757-899X doi:10.1088/1757-899X/844/1/012027 Corporación Universidad de la Costa REDICUC - Repositorio CUC |
| url |
https://hdl.handle.net/11323/6545 https://repositorio.cuc.edu.co/ |
| dc.language.iso.none.fl_str_mv |
eng |
| language |
eng |
| dc.relation.references.spa.fl_str_mv |
[1] Asi O. 2006. Fatigue failure of a helical gear in a gear box. Engineering Failure Analysis. 13 1116-1125. [2] Yadav A. 2012. Different types Failure in gears-A Review. International Journal of Science, Engineering and Technology Research. 5 82-92. [3] Jotram Patel J, Sahu G, Kumar P. 2015. A study on common failure of gears. International Journal Of Innovative Research In Technology. 6 301-307 [4] Errichello R. 2002. How to analyze gear failures. Journal of Failure Analysis and Prevention, 2, 6 8-16. [5] Peng C. 2011. Failure analysis of a gear tooth fracture of a rolling mill decelerator. Engineering Failure Analysis. 18,1 25-35 [6] Goytisolo R, Noa J, Hernández H, Cabello M, Alemán G, Consuegra M, Alfonso R, Sagastume P and Morffi A. 2007. Análisis y soluciones de la avería de la criba de la planta de trituración y secado de la empresa “Cementos Cienfuegos SA. Proceeding of 8º Congreso Iberoamericano De Ingeniería Mecánica. Cusco, Perú. Octubre 2007. Available from: http://congreso.pucp.edu.pe/cibim8/pdf/32/32-07.pdf [7] Mayer C. 1981.Torsional Vibration Problems and Analyses of Cement Industry Drives. IEEE Transactions on Industry Applications. 17,1 81-83 [8] Yunusa A, Kermani M and Labib A. 2017. Investigation of critical failures using root cause analysis methods: Case study of ASH cement PLC. Engineering Failure Analysis, 73, 25-45. [9] Montano E. 2014. Sistema experto prototipo para análisis de falla en engranes. Universidad Nacional Autónoma De México. Master Thesis. Available on: http://www.ptolomeo.unam.mx:8080/xmlui/bitstream/handle/132.248.52.100/4221/Tesis.pdf?sequ ence=3 [10] González G. 1997. Descifrado Geométrico y Cálculo de la Capacidad de Carga de Engranajes Cilíndricos. Proceeding of 9no Congreso Iberoamericano de Mantenimiento. Lima, Perú. 245-250 [11] International Standard (ISO) 6336. 2006. Calculation of load capacity of spur and helical gears |
| dc.rights.spa.fl_str_mv |
CC0 1.0 Universal |
| dc.rights.uri.spa.fl_str_mv |
http://creativecommons.org/publicdomain/zero/1.0/ |
| dc.rights.accessrights.spa.fl_str_mv |
info:eu-repo/semantics/openAccess |
| dc.rights.coar.spa.fl_str_mv |
http://purl.org/coar/access_right/c_abf2 |
| rights_invalid_str_mv |
CC0 1.0 Universal http://creativecommons.org/publicdomain/zero/1.0/ http://purl.org/coar/access_right/c_abf2 |
| eu_rights_str_mv |
openAccess |
| institution |
Corporación Universidad de la Costa |
| bitstream.url.fl_str_mv |
https://repositorio.cuc.edu.co/bitstreams/949a55b9-98e0-4bc9-a273-e5197cd439ac/download https://repositorio.cuc.edu.co/bitstreams/b4bb2569-a375-49be-b25e-7724818c9e07/download https://repositorio.cuc.edu.co/bitstreams/747d1249-906c-40b4-a494-c04528b898c1/download https://repositorio.cuc.edu.co/bitstreams/3054f608-70fc-4f8a-8f50-7b9b3dcab3f9/download https://repositorio.cuc.edu.co/bitstreams/851eb4a5-f75e-46af-8e73-01f5a6da6a4a/download |
| bitstream.checksum.fl_str_mv |
03d2ecb31a10f04e68ad68cfedd4258d 42fd4ad1e89814f5e4a476b409eb708c e30e9215131d99561d40d6b0abbe9bad 421bd3768c382caec7ab9f8e264ab0e6 f6b51b53e867be7bfb2b47c3018ed125 |
| bitstream.checksumAlgorithm.fl_str_mv |
MD5 MD5 MD5 MD5 MD5 |
| repository.name.fl_str_mv |
Repositorio de la Universidad de la Costa CUC |
| repository.mail.fl_str_mv |
repdigital@cuc.edu.co |
| _version_ |
1828166807623565312 |
| spelling |
Castellanos, L MCabello, J JSagastume, AMartínez, V LOrtiz, A E2020-07-13T18:45:04Z2020-07-13T18:45:04Z20201757-89811757-899Xhttps://hdl.handle.net/11323/6545doi:10.1088/1757-899X/844/1/012027Corporación Universidad de la CostaREDICUC - Repositorio CUChttps://repositorio.cuc.edu.co/This paper presents a causal analysis of an unexpected failure of the pinion teeth of a large reducer installed in a limestone reclaimer which is part of a raw material transportation system of a cement factory. The Montano methodology is applied. It includes a collection of documentation, evidences, evaluation of failure mechanism by visual inspection and some hypothesis and their validation based on the analysis of the material resistance. It is demonstrated that although the teeth of the pinion were made of a suitable material and cemented correctly, they worked overloaded due to the presence of large rocks in the raw material. A resulting increase of contact tensions in the teeth over the allowed limits led to a fatigue failure process which is described in this work. The results of the analysis can be of great interest in order to develop preventive measures and avoid future undesired plant stoppages and economic losses.Castellanos, L MCabello, J JSagastume, AMartínez, V LOrtiz, A EengCC0 1.0 Universalhttp://creativecommons.org/publicdomain/zero/1.0/info:eu-repo/semantics/openAccesshttp://purl.org/coar/access_right/c_abf2Pinion teethFailure in a limestoneReclaimerCausal analysis of the pinion teeth failure in a limestone ReclaimerArtículo de revistahttp://purl.org/coar/resource_type/c_6501http://purl.org/coar/resource_type/c_2df8fbb1Textinfo:eu-repo/semantics/articlehttp://purl.org/redcol/resource_type/ARTinfo:eu-repo/semantics/acceptedVersion[1] Asi O. 2006. Fatigue failure of a helical gear in a gear box. Engineering Failure Analysis. 13 1116-1125.[2] Yadav A. 2012. Different types Failure in gears-A Review. International Journal of Science, Engineering and Technology Research. 5 82-92.[3] Jotram Patel J, Sahu G, Kumar P. 2015. A study on common failure of gears. International Journal Of Innovative Research In Technology. 6 301-307[4] Errichello R. 2002. How to analyze gear failures. Journal of Failure Analysis and Prevention, 2, 6 8-16.[5] Peng C. 2011. Failure analysis of a gear tooth fracture of a rolling mill decelerator. Engineering Failure Analysis. 18,1 25-35[6] Goytisolo R, Noa J, Hernández H, Cabello M, Alemán G, Consuegra M, Alfonso R, Sagastume P and Morffi A. 2007. Análisis y soluciones de la avería de la criba de la planta de trituración y secado de la empresa “Cementos Cienfuegos SA. Proceeding of 8º Congreso Iberoamericano De Ingeniería Mecánica. Cusco, Perú. Octubre 2007. Available from: http://congreso.pucp.edu.pe/cibim8/pdf/32/32-07.pdf[7] Mayer C. 1981.Torsional Vibration Problems and Analyses of Cement Industry Drives. IEEE Transactions on Industry Applications. 17,1 81-83[8] Yunusa A, Kermani M and Labib A. 2017. Investigation of critical failures using root cause analysis methods: Case study of ASH cement PLC. Engineering Failure Analysis, 73, 25-45.[9] Montano E. 2014. Sistema experto prototipo para análisis de falla en engranes. Universidad Nacional Autónoma De México. Master Thesis. Available on: http://www.ptolomeo.unam.mx:8080/xmlui/bitstream/handle/132.248.52.100/4221/Tesis.pdf?sequ ence=3[10] González G. 1997. Descifrado Geométrico y Cálculo de la Capacidad de Carga de Engranajes Cilíndricos. Proceeding of 9no Congreso Iberoamericano de Mantenimiento. Lima, Perú. 245-250[11] International Standard (ISO) 6336. 2006. Calculation of load capacity of spur and helical gearsPublicationORIGINALCausal analysis of the pinion teeth failure in a limestone reclaimer.pdfCausal analysis of the pinion teeth failure in a limestone reclaimer.pdfapplication/pdf891207https://repositorio.cuc.edu.co/bitstreams/949a55b9-98e0-4bc9-a273-e5197cd439ac/download03d2ecb31a10f04e68ad68cfedd4258dMD51CC-LICENSElicense_rdflicense_rdfapplication/rdf+xml; charset=utf-8701https://repositorio.cuc.edu.co/bitstreams/b4bb2569-a375-49be-b25e-7724818c9e07/download42fd4ad1e89814f5e4a476b409eb708cMD52LICENSElicense.txtlicense.txttext/plain; charset=utf-83196https://repositorio.cuc.edu.co/bitstreams/747d1249-906c-40b4-a494-c04528b898c1/downloade30e9215131d99561d40d6b0abbe9badMD53THUMBNAILCausal analysis of the pinion teeth failure in a limestone reclaimer.pdf.jpgCausal analysis of the pinion teeth failure in a limestone reclaimer.pdf.jpgimage/jpeg21139https://repositorio.cuc.edu.co/bitstreams/3054f608-70fc-4f8a-8f50-7b9b3dcab3f9/download421bd3768c382caec7ab9f8e264ab0e6MD54TEXTCausal analysis of the pinion teeth failure in a limestone reclaimer.pdf.txtCausal analysis of the pinion teeth failure in a limestone reclaimer.pdf.txttext/plain20674https://repositorio.cuc.edu.co/bitstreams/851eb4a5-f75e-46af-8e73-01f5a6da6a4a/downloadf6b51b53e867be7bfb2b47c3018ed125MD5511323/6545oai:repositorio.cuc.edu.co:11323/65452024-09-17 14:12:09.042http://creativecommons.org/publicdomain/zero/1.0/CC0 1.0 Universalopen.accesshttps://repositorio.cuc.edu.coRepositorio de la Universidad de la Costa CUCrepdigital@cuc.edu.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 |