Laser bidezko prozesu gehigarrietarako hauts-elikagailuen azterketa eta kalibrazioa.

Abstract

A stable powder feeding system is a key element for achieving the desired results in powder-based processes, such as, Laser Metal Deposition (LMD). Therefore, in the present research paper a comparison between the different existing feeder configurations is presented. After analyzing their characteristics, it is concluded that for the LMD process gravitation-based rotatory feeders and fluidization-based feeders provide the best results. Besides, a methodology is proposed for obtaining the calibration curves of gravitation-based rotatory feeders and results are presented for various metallic powders, such as Inconel 718, AISI 316L and Stellite 6. It is concluded that the powder feeder behaves lineally, what eases its programming. Furthermore, a single equation that determines the real powder feed rate of different materials based on the rotation speed is determined. For this purpose, the packaging coefficient of the metallic particles is defined and calculated.; Ikerlan honetan gaur egun fabrikazio gehigarri zuzenerako, ingelesez LMD deitua, erabiltzen diren hauts-elikagailuen alderaketa aurkeztu da. Bakoitzaren ezaugarriak aztertu ostean, LMD prozesurako egokienak zeintzuk diren ondorioztatu da: Grabitatean oinarritutako disko birakariko elikagailuak eta jariakortasunean oinarritutako elikagailuak. Gainera, gaur egun hedatuen dagoen elikatze-sistemaren, grabitatean oinarritutako disko birakariko hauts-elikagailua, material desberdinentzako kalibrazio-kurbak eskuratzeko metodologia proposatu da eta lorturiko emaitzak esperimentalki balioztatu dira. Kalibrazio-kurbak Inconel 718, AISI 316L eta Stellite 6 materialentzat kalkulatu dira, eta, lortutako emaitzetan oinarrituz, sistemaren portaera lineala dela ondorioztatu da. Bestalde, material desberdinen kalibrazio-kurbak definitzen dituen ekuazio bakarra zehaztu da; trinkotze-koefiziente deituriko parametroa erabili da horretarako.