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D. A. Chavan


Additive manufacturing (AM), Numerical Thermal Model, Effective Thermal Conductivity (Keff), Selective Laser Sintering (SLS), Total Emissivity of Powder Bed (ε).


The Additive Manufacturing (AM) is one of the important techniques included in Industry4.0. Industry 4.0 is commonly referred as fourth industrial revolution. This technology helps to create 3D models / end use parts from 3D CAD data using layer bylayer approach. This helps designers to develop complex yet functional parts in various industries which are very difficult to manufacture by conventional manufacturing methods as time, cost and worker fatigue concern. Initially it started with the plastic prototype later it has been used on metal and its alloys by using the concept of Selective Laser Sintering (SLS), Selective Laser Melting (SLM) and Direct Metal Laser Sintering (DMLS). In laser sintering process the study of parameters such as effective thermal conductivity, total emissivity of powder bed, specific heat, absorptivity, relative density and other thermal properties of powder material and laser properties are necessary to analyses the laser sintering process. These parameters are determined by analytically and experimentally so understanding of analytical or numerical models to predict those parameters. By using the temperature dependent powder material properties as input for simulation in ANSYS APDL in which it should achieve the sintering temperature (For copper sintering temperature range 800˚C to 900˚C) in a field to determine the further results. Gaussian beam model has been used to determine the temperature distribution along the x, y and depth directions. By keeping laser power and powder bed thickness constant the laser speed is determined to achieve the sintering temperature in a field. This whole laser sintering process analyses by using heat transfer model with boundary conditions.

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Published in: Volume : 4, Issue : 10
Publication Date: 10/3/2018

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