Ingeniería Mecánica

Permanent URI for this collectionhttp://repositorio.uta.edu.ec/handle/123456789/900

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Subject: search.filters.subject.MOLDES

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    Desarrollo de un plan de mantenimiento preventivo para los moldes de inyección en el área de producción de la empresa Halley Corporación C.L
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Mecánica, 2023-03) Quinatoa Chato, Elizabeth Cristina; Castro Miniguano, Christian Byron
    The preventive maintenance plan is fundamental for a company, because it is used to predict minor problems in machines and components before they present failures. That is why to carry out this technical project, the needs of the company "Halley Corporación CL" were taken into account, to have a preventive maintenance plan for the molds knowing how important it is to have one, this will help us to early detection of failures or damage that may occur in the molds and their components, in order to prolong their useful life and thus reduce costs. For the development of the maintenance plan, an inventory was started, where the current state of the molds is detailed, a list of components was also generated and technical sheets were made to then proceed with an analysis of failures and failure modes of the components by means of the AMFE matrix based on NTP 679, finally the Weibull mathematical and graphic model was applied according to NTP 331 to determine the reliability of the molds. Consequently, the numerical values and parameters necessary to configure detailed time intervals per month were obtained, with the help of logs and maintenance ranges where the corresponding preventive actions are carried out, to prioritize maintenance work.
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    Diseño y construcción de moldes para la obtención de probetas en verde a compresión bajo normas ASTM
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Mecánica, 2019) Gálvez Albán, Lilibeth Aracelly; Espín Lagos, Segundo Manuel
    This document deals with the design and construction of molds for obtaining green test specimens under ASTM standards, so the design of the molds was carried out respecting the measures detailed in the standards, later a work material was selected that This project was a steel AISI D3 commercially known steel K100, which due to its chemical composition in the analysis carried out in a design software (von misses and safety factor) fulfilled what was required. In the case of the punches, being the part that suffers the most during the compaction process, a mathematical analysis was carried out. Then proceeded to the machining of each of the parts that make up the molds, where for the preparation of the plate-female was used a wire EDM cutter, to have a better accuracy in the measurements of the molds manufactured. As regards the process of compaction of the metallic powder, a hydraulic press with a plunger diameter of 20.5 cm was used, which allowed us to give a compaction pressure of 1000 PSI, obtaining test pieces for tension tests with thicknesses of 3.56 and 6.35 mm within the tolerance of ± 0.13 and specimens for impact tests with thicknesses of 10 mm with a tolerance of ± 0.10. The mold that presented the least difficulty was that of the test pieces for stress testing since its geometry has several radii, which improve the process. Vaseline was used as a lubricant, as it is considered a natural lubricant and would not affect the chemical composition of the compacted powder. The quantities of powder initially calculated to be placed in each mold can vary when obtaining the specimens, because some material is lost when placing the powder in the cavity of the molds as in the case of tension test tubes. an amount of 17.5 gr was weighed for 3.56 mm and 31.5 mm thickness specimens for 6.35 mm specimens where, after being compacted, they had a variation of 0.3 g with respect to the initial amount, and for the specimens for impact tests the The amount of the powder was 54 gr, so after the compaction it obtained a weight of 53.5 gr.
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    Diseño y construcción de un molde de inyección del arco almohadillado, de protectores auditivos para la empresa Halley Corporación”
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica. Carrera de Ingeniería Mecánica, 2017) Casañas Bonifaz, David Ignacio; Carrillo Rosero, Carlos Mauricio
    The object of the present work is satisfy the necessity of the company Halley Corporation, with the end of do the arc pad in series in the same time with certain dimensions, for this reason the author of the work have requirements of the company for elaborate the mold, like the material that will be used for the building, and the plastic that will be used for inject the object that need the company. For this reason, the project was started with the modeling of the arc pad in a specialized software, after that we got the nucleus and cavity of the object to inject. Then with the help of the software we analyze the demoulding angles and the dimensions that need the arc pad. For other part, the calculations were obtained in based of requirements of the company like the material that will be injected, in this case the material is ABS, and the material that will used for the building of the mold Among the calculations that were obtained are the feeding, refrigeration and expulsion systems for asegurate the correct operation of the mold. For finish the project we realized machining of the arc pad with a CNC milling machine, also it was built the different elements that make up the mold. The tests of the construction of the mold were realized with the help of an injecting machine, in this moment we look that the selection of the systems were correct, because the mold had an adequate efficiency in the injection process.
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    Estudio de la inyectora de poliuretano y la factibilidad de controlar la temperatua en los puntos críticos de la máquina construida por la empresa Italplásticos de la Ciudad de Ambato
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica. Carrera de Ingeniería Mecánica., 2011) García Terán, Alex Omar; Mayorga Pardo, Alex Santiago
    La Inyectora de Poliuretano está dando gran avance al proceso de moldeo de plásticos como los termoestables, ya que su proceso de inyección y colado es más eficiente en la generación de plantas de calzado, en ese tipo de máquinas existen algunos puntos críticos de estudio como el control de la temperatura que es uno de ellos y tal vez uno de los que más afecta en cualquier proceso que requiera controlarse. Para generar el poliuretano se requiere de la mezcla de dos componentes que son el Isocianato y el Poliol, estos dos componentes al unirse forman una reacción química dando como resultado la espuma de poliuretano o poliuretano como lo conocemos, pero antes que se realice la mezcla estos dos componentes son precalentados en un horno a determinada temperatura y luego se los lleva a una temperatura optima de trabajo, esta temperatura es controlada por un sensor dando como resultado un mejor control de la temperatura en este punto clave del proceso. En este tipo de máquina siempre hay un punto crítico de temperatura que controlar sea en los componentes o en los moldes, pero depende del investigador demostrar cuál es el punto de mayor incidencia a base de análisis y pruebas determinando de esta forma el punto que requiere el mayor control posible.