Visagie, NSmal, CA2014-02-132014-02-132013-10Visagie, N and Smal, C.A. 2013. Hopper design for metallic powders used in additive manufacturing processes. In: 14th annual RAPDASA (Rapid product development association of South Africa), Golden Gate, Free State, 30 October 2013http://hdl.handle.net/10204/721414th annual RAPDASA (Rapid product development association of South Africa), Golden Gate, Free State, 30 October 2013The influence of hopper geometry on the flow behaviour of typical metallic powders used in additive manufacturing processes is investigated. Bulk hopper theory provides a method of determining critical hopper parameters for bulk amounts of particulate solids to be stored and discharged out of hoppers. Bulk hopper theory proves to be unsuitable for the additive manufacturing process. The discharge rate of powder out of the hopper is as important as the flow / no-flow criteria used for bulk hopper theory. Additive manufacturing requires the controlled delivery of small amounts of powder onto a bed in a homogenous layer that is usually less than 100 µm thick. Powder flow behaviour of different metal alloys with particle diameters in the range of 20 – 90 µm is investigated. Powder volumetric flow rates as a function of hopper outlet width is determined. The results obtained through experimentation are presented in the form of empirical equations.enAdditive manufacturingPowder flowHopper designConference PresentationVisagie, N., & Smal, C. (2013). Hopper design for metallic powders used in additive manufacturing processes. http://hdl.handle.net/10204/7214Visagie, N, and CA Smal. "Hopper design for metallic powders used in additive manufacturing processes." (2013): http://hdl.handle.net/10204/7214Visagie N, Smal C, Hopper design for metallic powders used in additive manufacturing processes; 2013. http://hdl.handle.net/10204/7214 .TY - Conference Presentation AU - Visagie, N AU - Smal, CA AB - The influence of hopper geometry on the flow behaviour of typical metallic powders used in additive manufacturing processes is investigated. Bulk hopper theory provides a method of determining critical hopper parameters for bulk amounts of particulate solids to be stored and discharged out of hoppers. Bulk hopper theory proves to be unsuitable for the additive manufacturing process. The discharge rate of powder out of the hopper is as important as the flow / no-flow criteria used for bulk hopper theory. Additive manufacturing requires the controlled delivery of small amounts of powder onto a bed in a homogenous layer that is usually less than 100 µm thick. Powder flow behaviour of different metal alloys with particle diameters in the range of 20 – 90 µm is investigated. Powder volumetric flow rates as a function of hopper outlet width is determined. The results obtained through experimentation are presented in the form of empirical equations. DA - 2013-10 DB - ResearchSpace DP - CSIR KW - Additive manufacturing KW - Powder flow KW - Hopper design LK - https://researchspace.csir.co.za PY - 2013 T1 - Hopper design for metallic powders used in additive manufacturing processes TI - Hopper design for metallic powders used in additive manufacturing processes UR - http://hdl.handle.net/10204/7214 ER -