Abstract
Abstract
Powder Bed Fusion is a promising metal additive manufacturing technology based on layer by layer powder spreading, and particle uniformity has a great influence on the forming quality. By Discrete Element Method, the interaction and movement between particles were studied during powder spreading, including powder jamming, rebound, splash, eddy and empty powder area. Additionally, five kinds of powder spreading schemes were explored, and the new process of one-way reciprocating with tri-splint blade was designed to change the motion state of powder spreading from "blade pushing powder" to "blade holding powder". The results showed that by adjusting the spacing between the blade and the working platform, the optimized powder spreading process decreased the defects such as powder splash and empty powder, and achieve the uniform powder bed of aluminum alloy powder.
Publisher
Research Square Platform LLC
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