Vljudno vabljeni na predavanje
Porosity Control in Additive Manufacturing Processes,
doc. dr. Soham Mujumdar,
Department of Mechanical Engineering, IIT Bombay,
ki bo v četrtek, 8. junija 2023, ob 10. uri v predavalnici II/3A
Povzetek
Porosity is a major quality issue in additively manufactured (AM) materials due to the improper selection of raw materials or process parameters. While porosity is kept to a minimum for structural applications, parts with intentional (engineered) porosity find applications in prosthetics, sound dampeners, mufflers, catalytic converters, electrodes, heat exchangers, filters, etc. In the first part of the talk, I would like to introduce in-situ laser remelting as an effective method to mitigate porosity and other surface defects in laser-directed energy deposition (L-DED). The experimental findings of the effect of laser remelting parameters on the porosity, microhardness, and surface finish of the additively manufactured parts will be discussed.
The second part of the talk addresses the problem of the lack of in-situ diagnostic techniques for assessing the quality of additively manufactured parts. Such techniques could enable closed-loop feedback of the additive process to produce parts with minimal or finite engineered porosity. In hybrid
manufacturing processes with alternate additive and subtractive cycles, we propose to use the machining signals for additive process monitoring. The information of cutting forces, vibrations, acceleration, and temperature during the subtractive cycles, monitored continuously or after several additions of material layers, could provide localized structural information in the manufactured parts that can lead to actions such as correction of the 2D-deposition patterns, or removal and re-deposition of layers. Experimental findings correlating the machining forces with porosity-driven part quality will be presented in this context.
O predavatelju
Dr. Soham Mujumdar is an assistant professor in the Mechanical Engineering Department at the Indian Institute of Technology Bombay. He joined IIT Bombay in 2018 after completing his Ph.D. in Mechanical Engineering from the University of Illinois at Urbana-Champaign, where he also worked as a postdoctoral researcher. Dr. Mujumdar holds a bachelor’s degree in Production and Industrial Engineering from IIT Roorkee.
Dr. Mujumdar has over fourteen years of research experience in the development and modeling of manufacturing processes. During his Ph.D., he developed a multi-physics model of the electrical discharge machining (EDM) process. This research utilized a physics-based approach to model the process of dielectric breakdown, formation and expansion of EDM plasma, and resulting material removal. These modeling tools were further used to explore possible mechanisms for improving the productivity and energy efficiency of the EDM process. As a postdoc, Dr. Mujumdar worked on multiple projects in the areas of atomized spray-based cutting fluid delivery, titanium machining, electrical discharge machining, and high-pressure die-casting.
Dr. Mujumdar’s current research interests include mechanical and electrical discharge-based micromachining, additive manufacturing, and manufacturing sustainability. He is actively engaged in research projects related to these areas and has published numerous research articles in peer-reviewed journals.
Vljudno vabljeni!
izr. prof. dr. Joško Valentinčič prof. dr. Mihael Sekavčnik, dekan