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ELECTROMAGNETIC BLUNTING OF DEFECTS WITHIN FUSED DEPOSITION MODELING (FDM)COMPONENTS

United States Patent Application

20160318246
A1
View the Complete Application at the US Patent & Trademark Office
Oak Ridge National Laboratory - Visit the Partnerships Directorate Website
A method and apparatus for additive manufacturing that applies a magnetic field to reduce undesirable imperfections, such as voids or air pockets, in a deposited working material. The apparatus includes a nozzle for extruding a plastic material and a supply of polymeric working material provided to the nozzle, wherein the polymeric working material is magnetically susceptible and/or electrically conductive, and a magneto-dynamic heater for producing a time varying, high flux, frequency sweeping, alternating magnetic field in the vicinity of the nozzle and/or the deposited working material to penetrate into working material to reflow or constrict at least portions of the material through at least one of an induced transient magnetic domain and an induced, annular current.
Rios, Orlando (Knoxville, TN), Kunc, Vlastimil (Concord, TN), Duty, Chad (Loudon, TN), Love, Lonnie (Knoxville, TN)
14/ 699,426
April 29, 2015
GOVERNMENT RIGHTS [0001] This invention was made with government support under Contract No. DE-AC05-00OR22725 awarded by the U.S. Department of Energy. The government has certain rights in the invention.