Thesis EVALUACIÓN Y PROPUESTA DE ESTRATEGIA DE MANTENIMIENTO PREVENTIVA CÍCLICA PARA EL RECAMBIO DE LOS DIENTES DE BALDES DE PALAS ELÉCTRICAS EN COMPAÑÍA MINERA DE GRAN TAMAÑO
Date
2019-12
Authors
HERNÁNDEZ MELLADO, GONZALO
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Abstract
Este trabajo de título fue desarrollado en la Superintendencia Mantención Palas en la Compañía Minera Doña Inés de Collahuasi SCM. La finalidad principal es entregar una propuesta de mantenimiento distinta a la existente para elementos de desgaste, específicamente los dientes de baldes de palas electromecánicas. El estudio consiste en hallar un tiempo de reemplazo que minimice costos de mantenimiento, al mismo tiempo que busca mejorar la confiabilidad de los dientes. Se comienza explicitando los objetivos y alcances, para luego dar contexto al proceso y la compañía en la que se realizó el trabajo de memoria. Además se hace un breve resumen del modelo de gestión de la compañía. Luego se presenta la teoría que está detrás del estudio, comenzando con una breve explicación del mantenimiento y la matemática detrás de la función de probabilidad de Weibull. Se explica que significan sus parámetros cuando son aplicados al mantenimiento, y el método matemático utilizado para calcularlos. Se hace una breve introducción de las palas electromecánicas que operan en faena y de los elementos de desgaste que están presentes en los baldes. Se analiza la estrategia de mantenimiento existente en los elementos de desgaste y se cuantifican sus costos. Luego se hace un análisis de los principales focos de mejora, en donde se encontró que la estrategia de mantenimiento existente pretende obtener un máximo de utilización del diente y a la vez evitar la caída de elementos de desgaste que luego se transforman en elementos inchancables, lo cual repercute de manera negativa al aumentar las inspecciones y detenciones para reparaciones. Finalmente, se tiene como resultado de la estrategia propuesta, que al realizar el remplazo de la totalidad de los dientes marca MTG en palas P&H luego de 185 horas de funcionamiento, genera una disminución en costos de mantenimiento y un aumento en la confiabilidad de los dientes.
This title work was developed in the Superintendence of Power Shovels in Compañía Minera Dona Inés de Collahuasi SCM. The final purpose is delivering a maintenance proposal that is different to the already existence maintenance for grounded engaging tools (GETS), specifically the bucket teeths in electrical power shovels. The study consists to find a replacement time that minimize maintenance costs, while finds improve the reliability of teeths. At beginning it is specifying objectives and achievements, for then give context to the process and the company where title work was made. Besides, a brief summary of the management model of the company is made. Then, theory behind the study is presented, starting with a brief explication of maintenance and the mathematics behind the Weibull probability function. An explication it is made of what these parameters means when are applying to the maintenance, and the mathematic method for calculate them. A brief introduction it is done of the electromechanical power shovels operating in chore and the GETS presents in the buckets. The maintenance strategy already existent in the GETS it is analyzed and their costs are quantified. Then, an analysis of the main focus of improvement it is made, where it was found that the maintenance strategy already existent pretends to obtain the maximum utilization of the teeth while avoiding the falling of GETS, which then become in uncrushables, which has a negative impact by increasing inspections and detentions to repairs. Finally, it has as result of the proposed strategy, when all the MTG brand teeths in P&H power shovels after 185 hours running, generates a decrease in maintenance costs and an increase of the reliability of the teeths.
This title work was developed in the Superintendence of Power Shovels in Compañía Minera Dona Inés de Collahuasi SCM. The final purpose is delivering a maintenance proposal that is different to the already existence maintenance for grounded engaging tools (GETS), specifically the bucket teeths in electrical power shovels. The study consists to find a replacement time that minimize maintenance costs, while finds improve the reliability of teeths. At beginning it is specifying objectives and achievements, for then give context to the process and the company where title work was made. Besides, a brief summary of the management model of the company is made. Then, theory behind the study is presented, starting with a brief explication of maintenance and the mathematics behind the Weibull probability function. An explication it is made of what these parameters means when are applying to the maintenance, and the mathematic method for calculate them. A brief introduction it is done of the electromechanical power shovels operating in chore and the GETS presents in the buckets. The maintenance strategy already existent in the GETS it is analyzed and their costs are quantified. Then, an analysis of the main focus of improvement it is made, where it was found that the maintenance strategy already existent pretends to obtain the maximum utilization of the teeth while avoiding the falling of GETS, which then become in uncrushables, which has a negative impact by increasing inspections and detentions to repairs. Finally, it has as result of the proposed strategy, when all the MTG brand teeths in P&H power shovels after 185 hours running, generates a decrease in maintenance costs and an increase of the reliability of the teeths.
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Keywords
MANTENIMIENTO INDUSTRIAL , MAQUINARIA MINERA , INDUSTRIA MINERA