Browsing by Author "Villacrés Padilla, David Andrés"

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    Análisis de aceros y recubrimientos utilizados en tambores de mezclado de los mixers de la empresa Holcim Ambato y su influencia en el desgaste abrasivo bajo la norma ASTM G105
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica. Maestría en Diseño Mecánico, 2017) Villacrés Padilla, David Andrés; Núñez Núñez, Diego Fernando
    This research project was developed under the objective of analyzing the types of steels and coatings used in the mixing drums of the mixers of the HOLCIM company Ambato and its influence on the abrasive wear under the ASTM G105 standard, which tests were carried out from abrasive wear and an analysis of the rate of such coatings. For the development of the research, a bibliographic, field and experimental methodology was used, also exploratory and descriptive to address the study phenomenon that included 8 trials with the application of different configurations for the evaluation of the variable, besides a 40 sample scheme was developed with ASTM AISI 1020 steels and ASTM A514 grade F high strength steel corresponding to the Holcim Mixer drum, which were applied to three types of coatings such as nitrided, metallized and cemented. Due to this it was possible to conclude that the application of coatings and thermal treatments on the steels improve the characteristics and properties with respect to the abrasive wear, these processes contribute to a greater hardness and abrasive resistance. In addition, it is determined that, in the case of the amorphous tungsten alloy coating, it presents the greatest increase of hardness of the surfaces, which defines as the best treatment applicable in the steels, reason why a procedure for the recovery of the mixers according to the location of the parts of the mixer drum of the HOLCIM company.