Ingeniería Mecánica

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Evaluación del desgaste de las herramientas de corte y acabado superficial en el fresado del acero inoxidable AISI 304 y acero AISI 1018 utilizando lubricación híbrida (nanofluidos +CO2)
(Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Mecánica, 2024-01) Llumitasig Tubón, Wilmer Alexander; Núñez Núñez, Diego Fernando; Ocaña Guzmán, Adriel Santiago
The present project focused on the analysis of the effect of the hybrid lubrication method and a Minimum Quantity Lubricant (MQL) system together with Titanium Dioxide and Alumina nanoparticles on the milling process of AISI 1018 and AISI 304 steels, cutting tool flank wear and surface finish, which will be carried out on a CNC milling machine. In this analysis hard metal inserts with PVD TiAlN coating were used, cutting speed is the variable parameter, the recommended and maximum values by the manufacturer were used to establish the experimental combinations, for the hybrid lubrication methods two types of nanoparticles were used, Titanium Dioxide and Alumina for AISI 1018 and AISI 304 steels respectively at a concentration of 0. 5 percent by weight; using a combination of liquid and gaseous CO2 together with the system of minimum amount of lubricant directed to the contact zone of the work material and cutting tool to minimize the friction and temperatures generated in the cutting process. For the evaluation of flank wear and roughness, standard instruments such as the scanning electron microscope, based on the ISO 8688-1 standard specialized in this type of evaluations, and a roughness meter for the measurement of surface quality Ra and Rz were used. After analysis of the results, the surface finish of the steels was improved and the service life of the cutting tools was increased.
Diseño y construcción de una bomba de pistón para acoplarse a las rotobombas de la FICM
(Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Mecánica, 2021-02) Feria Naranjo, Santiago Vinicio; Carrillo Rosero, Carlos Mauricio
The present technical project is directed in the design, construction and funcionality test of a piston pump, the same that is constituted of a Michell Banki and Pelton turbine, added to these a diaphragm pump. The project was designed with the purpose of obtaining a piston type pump that adapts to the design and technical specifications of rotary pumps in rigorous conditions. In the theoretical and analytical part, the pump was designed with 3 pistons achieving a more uniform discharge, likewise through the operating ranges of each rotary pump such as the output power, rpm, flow and pumping height it was achieved to size and select the elements that make up the pump. The equipment was built with material that absorbs the vibrations such as AA6063 aluminum for the casing, while for the pistons was used 304 stainless steel due to its great resistance to corrosion and temperature changes. At the start-up with each turbine were obtained pumping values represented in graphs of flow vs. height as well as pressure vs. height, in addition in addition a comparison was made between the performance of the piston pump versus the diaphragm pump, which resulted that the piston pump, exceeds a flow difference between 20 to 36 lt / min, besides it was determined that it is 10 percent more efficient, so the piston pump has better characteristics applied to turbines.
Evaluación del desgaste de las herramientas de corte y acabado superficial en el torneado del acero inoxidable AISI 304 mediante lubricación hibrida CO2 + NANO TiO2
(Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Mecánica, 2020-08) Mayorga Ases, Leticia Abigail; Carranza Calero, Diego Mauricio; Núñez Núñez, Diego Fernando
The present research focused on studying the influence of a hybrid lubrication method, which involves the use of cryogenic CO2 and a minimum lubricant quantity (MQL) system combined with titanium dioxide nanoparticles on the surface finish of elements automatically processes of turning, and flank wear of cutting tools, the evaluation was carried out in a finishing process on a conventional lathe, however, the proposed lubrication and cooling method can also be handled on CNC lathes. To analyze the analyzes, tungsten carbide inserts with a single tip radius established at 0.8 mm were used, the machining parameters to be varied were the cutting speed and feed, the recommended values and the maximum values of these will be used. two parameters to establish the experimental combinations, as well as the lubrication method, for half of the combinations it was carried out dry, while for the rest it was made use of the proposed hybrid refrigeration and lubrication system. The hybrid lubrication system comprises the use of liquid and gaseous CO2 combined with a minimum lubricant quantity system that uses a nano fluid composed of a biodegradable vegetable oil mixed with nanoparticles of titanium dioxide at a concentration of 0.5 per cent by weight , the mixture of cryogenic fluid and nano fluid was directed towards the part-tool contact area to counteract friction and lower cutting temperatures. Standard instruments such as a roughness tester capable of recording surface quality values Ra and Rz and a scanning electron microscope that detect and measure the evolution of flank wear of the flanges are used to evaluate the roughness and flank wear in the different parameter combinations. inserts in a precise manner in accordance with ISO 3685.

Ingeniería Mecánica

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