The authoritative public forum
  for Metal Finishing since 1989
-----

Surface Improvement of Rapid-manufactured Parts

Hello,

I'm working with a Clemson University research lab to improve the surface finish of parts made in our 3D Printer. The parts have a sintered 420 stainless steel powder (30um) base structure infiltrated with molten bronze to achieve full density. The resulting surface is very rough due to the capillary forces that draw the bronze into the part and leave the stainless powder protruding. We'd like to be able to get the finish to as-machined or better using a process that can accommodate complex 3D geometries and curvature. We've considered many avenues from PVC coating to shot peening. Is there a treatment option out there that can be applied with good dimensional control and yield a good quality surface finish? Any information would be greatly appreciated.

Nathan Race
Researcher - Clemson, SC, United States
2005

A. Electropolishing is worth a try.

Jeffrey Holmes, CEF
Spartanburg, South Carolina
2005

A. You used the words rough and protruding. To me, that means surface modification before any secondary coating and the best way to achieve those results is via mechanical finishing or more specifically mass finishing equip. Size and volume will determine proper equip.

AF Kenton
retired business owner - Hatboro, Pennsylvania
2005

A. Look into drag polishing.

BUD GRAYBILL
polishing shop - Cali.
2005