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Study of the Effects of Powder Dispensing Mechanism on Selective Laser Sintering Process

Mahmoodi, Amir Hossein | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48583 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Movahhedy, Mohammad Reza
  7. Abstract:
  8. Additive manufacturing (Simply called A.M.) is a group of manufacturing technologies that is developing rapidly and is being used widely in some industries like car manufacturing, Aerospace and producing Biomedical devices, In a way that some researchers believe that A.M. methods will change the future of manufacturing. One of the most important A.M. techniques is the Selective Laser Sintering (SLS) method that is mostly used in industrial applications. A SLS machine has a lot of sub systems and mechanisms that have key role in the Laser Sintering process. One of the mechanisms of SLS machine is the Powder Dispensing mechanism that produce layers of unsintered powder as thin as 100 microns on the machine platform and through this, it has a key effect on the quality and strength of the final parts. Here the procedure of powder dispensing by the mechanism has been investigated and the effects of geometry on the powder layer have been studied. For this, the Powder dispensing dynamics and flow have been modeled using numerical calculations of discrete element method, by the PFC2D software. In this modeling the properties of the PA2200, SLS grade PA12 powder, have been used for to enter in the software and the flow and motion of the powder system investigated while dispensing in the SLS process chamber. Also the results verified by the experimental efforts conducted on a self-developed SLS machine
  9. Keywords:
  10. Selective Laser Sintering (SLS)Method ; Discrete Element Method ; Additive Manufacturing ; Powder Mechanics ; Bulk Solid

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