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Optimization of Scan Algorithms in Selective Laser Sintering

Manshoori Yeganeh, Ahmad | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49750 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Movahhedi, Mohammad Reza; Khodaygan, Saeed
  7. Abstract:
  8. One of the most important manufacturing methods using technologies AM, is the SLS method. This method because it would significantly reduce the construction time is the ability to build a variety of materials, is pervasive. The SLS devices input is part CAD file which is then part layered, a layer of powder is poured on the bed. Each layer is defined contour on the part and then scanned by laser inner layer is hatched by laser. Scanning algorithms and hatching in the SLS is an important part of building that has an impact on properties part and a lot of research has been done about it. synthetic scan algorithms presented in this study. The purpose of this algorithm is that part warpage and residual stresses caused by thermal stress reduced, while the construction time to a minimum. Laser power, the speed of the laser, powder layer thickness, diameter laser spots, ambient temperature and preheat temperature is also considered to be constant. The scanning algorithm provided on the finite element model run and scan parameters including the number of offset and length of the vector scan to be optimized. The finite element model verification SLS is done by testing a few samples and synthetic scan mode with a simple scan is compared. Finally, synthetic scan algorithms and simple scan algorithms and parameters on two experimental test part is compared. The results indicate warpage on multilayer samples in synthetic scan mode is about 35% compared to the simple scan mode has been improved
  9. Keywords:
  10. Selective Laser Sintering (SLS)Method ; Scan Method ; Additive Manufacturing ; Hatching Pattern ; Comprehensive Scan Algorithm ; Multilayer Finite Element Modeling

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