US 11,702,759 B2
Sequenced pulse reverse waveform surface finishing of additively manufactured parts
Timothy D. Hall, Englewood, OH (US); Holly M. Garich, Fairborn, OH (US); Heather McCrabb, Kettering, OH (US); and Earl Jennings Taylor, Troy, OH (US)
Assigned to Faraday Technology, Inc., Englewood, OH (US)
Filed by Faraday Technology, Inc., Englewood, OH (US)
Filed on Aug. 11, 2021, as Appl. No. 17/399,148.
Application 17/399,148 is a division of application No. 16/774,232, filed on Jan. 28, 2020, granted, now 11,118,283.
Claims priority of provisional application 62/829,191, filed on Apr. 4, 2019.
Prior Publication US 2022/0002895 A1, Jan. 6, 2022
Int. Cl. C25F 3/16 (2006.01); C25F 7/00 (2006.01); B33Y 40/20 (2020.01); B22F 10/25 (2021.01); B22F 10/28 (2021.01)
CPC C25F 3/16 (2013.01) [B33Y 40/20 (2020.01); C25F 7/00 (2013.01); B22F 10/25 (2021.01); B22F 10/28 (2021.01)] 4 Claims
OG exemplary drawing
 
1. A system for surface finishing an additive manufactured part, the system comprising:
a chamber with an electrolyte, an electrode, and an additive manufactured part holder;
a pulse/pulse reverse power supply for connecting to the part rendering it anodic and connected to the electrode rendering it cathodic; and
a controller subsystem configured to operate the power supply to decrease the surface roughness of the part by:
applying a first series of waveforms including at least two waveforms where a diffusion layer is maintained at a thickness to produce a macroprofile regime relative to any macroasperities of the part, the first series of waveforms having anodic voltages of between 3 volts and 30 volts applied for anodic time periods before cathodic voltages of between 4 volts and 30 volts applied for cathodic time periods to effect part surface smoothing to a first surface roughness between 5 microns and 50 microns, and
applying a final waveform where the diffusion layer represents a microprofile regime, the final waveform having a final anodic voltage applied for a final anodic time period before a final cathodic voltage applied for a final cathodic time period to effect part surface smoothing to a final surface roughness of between 0.5 microns and 15 microns.