Ciencias Exactas y Ciencias de la Salud
Permanent URI for this collectionhttps://hdl.handle.net/11285/551039
Pertenecen a esta colección Tesis y Trabajos de grado de las Maestrías correspondientes a las Escuelas de Ingeniería y Ciencias así como a Medicina y Ciencias de la Salud.
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- Design and simulation of a metal additive manufacturing system by means of diode area melting technique(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2022) Berni Rios, Gerardo; López Botello, Omar Eduardo; dnbsrp; Rodríguez González, Ciro Ángel; Vázquez Lepe, Elisa Virginia; School of Engineering and Sciences; Campus MonterreyMetal additive manufacturing is a field of advanced manufacturing which consists in the building of a component layer by layer based on a 3D digital model. A vast variety of technologies had been researched in different types of additive manufacturing leading to very well standardized and established processes for the industry. Even though metal additive manufacturing presents lots of benefits, there still exists problems to be solved like the residual stresses generated due to the thermal cycle the piece is exposed to during the printing, the low energy absorption efficiency for specific materials, or the long duration of the process compared to a traditional manufacturing process. The work presented in this thesis developed a finite element model for the purpose of investigating the development of the thermal distributions along x-direction and y-direction of stainless steel 316L powder by applying the Diode Area Melting (DAM) technique to a Selective Laser Melting (SLM) additive manufacturing process. ANSYS Mechanical APDL software was utilized in performing coupled thermal-structural field analysis. This work is based on the design and simulation on a metal additive manufacturing system by powder bed fusion based on the technique of Diode Area Melting, which uses an array of multiple low power diode lasers that works at shorter wavelengths as is it accustomed. This approach has the intention of tackling the problems of time production, energy efficiency and residual stresses in the part. A thermal simulation experiment is done in order to determine the best configuration parameters for the powder fusion and the stresses generated by this new printing technique.
- Micro machinability of net shapes of Selective Laser Melting of Ti-6Al-4V for minimum material removal using ball end mill(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2018-05-15) Celis Renata, Pavel; Vázquez Lepe, Elisa Virginia; García López, Erika; Rodríguez González, Ciro Ángel; Sandoval Robles, Jesús A.Miniaturization of medical devices is playing an important role in the manufacture industry. New drug delivery systems are being studied and developed, therefore materials to produce these devices must be investigated extensively. The objective of this work is to experimentally investigate and compare the machinability of Ti-6Al-4V titanium alloy produced via Selective laser melting (SLM) against the conventional machining method. 18 patches of 09 needles each were fabricated and machined with different cutting feeds (120,150 and 180mm/min) with aid of a minimum quantity lubrication (MQL) system. Machinability was examined in terms of cutting forces, tool wear, surface roughness and geometrical dimensions. Each cutting feed was tested by fabricating 3 patches from solid blocks of titanium with square tools of .8mm. Finish pass was performed with a .2mm micro ball end mill with a constant spiral toolpath. Comparison was performed by fabricating four patches with SLM with an excess material of 150μm and machined with the same previous parameters. 3D images obtained by optical microscope reveal that the main force applied in the finishing of needles is the Z axis and cutting forces were higher when machining SLM patches. Tool calibration is the main factor to obtain high precision in geometrical dimensions due to the variation in length because of thermal expansion. Surface roughness for all tests were below 1μm with best results when cutting feed is set at 120mm/min, reduction in edge radius for ball end mills affected negatively the surface roughness. An economic comparison was performed and showed that the SLM combined with SM process has clear advantage over subtractive manufacture alone.