Simulation of the Heat Laser of the Selective Laser Sintering Process of the Polyamide12

Laser sintering sintering is one of the most widely used 3D printing technologies, in which it transforms 3D models into authentic parts with generally excellent workmanship, the test today is to ensure the unmatched nature of the item produced, therefore hypothetically to understand and predict the thermal history in this process, the thermal models must be exact and fair, In this article, the consideration will be focused on the different models of heat flux diffusion, in the bibliography, some formulas Numbers that describe the transport of the heat source out of the powder bed have been found. A comparison between its laser source models will be established. The re-modeling takes place in MATLAB using the parameters of polyamide12.

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Physical Modeling for Selective Laser Sintering Process

Journal of Computing and Information Science in Engineering ◽

10.1115/1.4034473 ◽

2017 ◽

Vol 17 (2) ◽

Cited By ~ 5

Author(s):

Arash Gobal ◽

Bahram Ravani

Keyword(s):

Physical Modeling ◽

Large Scale ◽

Selective Laser Sintering ◽

Powdered Material ◽

Laser Sintering ◽

Industrial Applications ◽

Transient Temperature ◽

Sintering Process ◽

Powder Bed ◽

Selective Heating

The process of selective laser sintering (SLS) involves selective heating and fusion of powdered material using a moving laser beam. Because of its complicated manufacturing process, physical modeling of the transformation from powder to final product in the SLS process is currently a challenge. Existing simulations of transient temperatures during this process are performed either using finite-element (FE) or discrete-element (DE) methods which are either inaccurate in representing the heat-affected zone (HAZ) or computationally expensive to be practical in large-scale industrial applications. In this work, a new computational model for physical modeling of the transient temperature of the powder bed during the SLS process is developed that combines the FE and the DE methods and accounts for the dynamic changes of particle contact areas in the HAZ. The results show significant improvements in computational efficiency over traditional DE simulations while maintaining the same level of accuracy.

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Preparation and in-vitro evaluation of Fe2O3-doped DP-bioglass in combination with 3D-printing and selective laser sintering process (3DP-SLS) for alveolar bone augmentation

Ceramics International ◽

10.1016/j.ceramint.2021.01.132 ◽

2021 ◽

Author(s):

Chih-Ying Chi ◽

Ching-Yun Chen ◽

Jian-Yuan Huang ◽

Che-Yung Kuan ◽

Yu-Ying Lin ◽

...

Keyword(s):

3D Printing ◽

Alveolar Bone ◽

Selective Laser Sintering ◽

Laser Sintering ◽

Bone Augmentation ◽

Sintering Process ◽

In Vitro Evaluation

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A Test Part for Evaluating the Accuracy and Resolution of a Polymer Powder Bed Fusion Process

Journal of Mechanical Design ◽

10.1115/1.4037303 ◽

2017 ◽

Vol 139 (10) ◽

Cited By ~ 9

Author(s):

Jared Allison ◽

Conner Sharpe ◽

Carolyn Conner Seepersad

Keyword(s):

Selective Laser Sintering ◽

Statistical Design ◽

Laser Sintering ◽

Industrial Applications ◽

Design Guidelines ◽

Powder Bed Fusion ◽

Sintering Process ◽

Powder Bed ◽

Test Part ◽

Polymer Powder

Additive manufacturing (AM) has many potential industrial applications because highly complex parts can be fabricated with little or no tooling cost. One barrier to widespread use of AM, however, is that many designers lack detailed information about the capabilities and limitations of each process. To compile statistical design guidelines, comprehensive, statistically meaningful metrology studies need to be performed on AM technologies. In this paper, a test part is designed to evaluate the accuracy and resolution of the polymer powder bed fusion (PBF) or selective laser sintering process for a wide variety of features. The unique construction of this test part allows it to maximize feature density while maintaining a small build volume. As a result, it can easily fit into most existing selective laser sintering builds, without requiring dedicated builds, thereby facilitating the repetitive fabrication necessary for building statistical databases of design allowables. By inserting the part into existing builds, it is also possible to monitor geometric accuracy and resolution on a build- and machine-specific basis in much the same way that tensile bars are inserted to monitor structural properties. This paper describes the test part and its features along with a brief description of the measurements performed on it and a representative sample of the types of geometric data derived from it.

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Process Phenomena and Material Properties in Selective Laser Sintering of Polymers: A Review

Materials ◽

10.3390/ma15010183 ◽

2021 ◽

Vol 15 (1) ◽

pp. 183

Author(s):

Federico Lupone ◽

Elisa Padovano ◽

Francesco Casamento ◽

Claudio Badini

Keyword(s):

Material Properties ◽

Complex Geometry ◽

Selective Laser Sintering ◽

Laser Sintering ◽

Laser Source ◽

Layer By Layer ◽

Powder Bed ◽

Complex Process ◽

And Performance ◽

Physical Phenomena

Selective laser sintering (SLS) is a powder bed fusion technology that uses a laser source to melt selected regions of a polymer powder bed based on 3D model data. Components with complex geometry are then obtained using a layer-by-layer strategy. This additive manufacturing technology is a very complex process in which various multiphysical phenomena and different mechanisms occur and greatly influence both the quality and performance of printed parts. This review describes the physical phenomena involved in the SLS process such as powder spreading, the interaction between laser beam and powder bed, polymer melting, coalescence of fused powder and its densification, and polymer crystallization. Moreover, the main characterization approaches that can be useful to investigate the starting material properties are reported and discussed.

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Selective Laser Sintering of Resin-Coated Sands—Part I: The Laser-Material Interaction

Journal of Manufacturing Science and Engineering ◽

10.1115/1.3046132 ◽

2008 ◽

Vol 131 (1) ◽

Cited By ~ 7

Author(s):

Fabrizio Quadrini ◽

Loredana Santo

Keyword(s):

Focal Spot ◽

Selective Laser Sintering ◽

Laser Sintering ◽

Laser Source ◽

Layer By Layer ◽

Sintering Process ◽

New Approach ◽

Laser Material ◽

Definition Of ◽

Material Interaction

Selective laser sintering of precoated sands is a process utilized to produce molds and cores for rapid casting by adding sand layer by layer and heating it using a laser beam. During the process, the resin flows and binds the grains; subsequently, an oven is used for the postcuring treatment to complete the curing of the resin. The aim of this paper was to study the laser-material interaction using a diode laser to directly obtain the material consolidation. It was the first step in the definition of a new approach for process investigation and innovation. Two main aspects were investigated with the laser source in a standstill position: first, the influence of the laser power, the location of the focal spot, and the exposure time on sand consolidation; second, the shape and dimension of cured samples depending on the process parameters. The experimental data, in terms of weight and size of the hardened sands, were analyzed, and a master curve was found. In Part II of this paper the selective laser sintering process will be implemented to produce shells.

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