[rp-ml] RE: de-powdering mass quantities of sintered parts?

From: Amend, Matthew J <Matthew.J.Amend_at_boeing.com>
Date: Mon, 21 Jan 2013 14:02:45 -0800

Hmmm. Removing parts from the cake is quick, it's removing powder from the parts that takes time. Especially getting it out of nooks & crannies. Also, we are careful to put the loose powder back into the recycle mix but want to discard the baked powder that's adhered to the parts.

We're thinking along the concept of a drive-through carwash. Put them into some sort of cage that gets blasted by HP air and then by beads. Preferably all within an enclosure.

From: Greg Paulsen [mailto:GPaulsen_at_protoprod.com]
Sent: Monday, January 21, 2013 1:42 PM
To: Amend, Matthew J; rp-ml_at_rapid.lpt.fi
Subject: RE: de-powdering mass quantities of sintered parts?

I was reading an article on Shapeways and noticed they use a large tumbler (commonly used for polishing metal parts). Here's the article's link: http://fabbaloo.com/blog/2013/1/8/deep-deep-inside-shapeways.html#.UP2znSc0V8F look at the 4th picture down. Depending on your part/cake density and your parts geometry I could see a whole cake thrown in a tumbler and left to self-clean. This may affect recycle rate if you're throwing cake back in the mix.

As an experiment we rigged a rigid grate/sifter over a collection bin that was mounted to one of our smaller tumblers and turned that on. After a couple hours the majority of powder was broken free and parts were ready for bead blasting. You just want to make sure that dust containment is available if you try this or things can get messy.

Gregory M. Paulsen
Prototype Productions, Inc.
Office 703.858.0011 x314
Cell 540.974.1348

From: owner-rp-ml_at_rapid.lpt.fi [mailto:owner-rp-ml_at_rapid.lpt.fi] On Behalf Of Amend, Matthew J
Sent: Monday, January 21, 2013 4:07 PM
To: rp-ml_at_rapid.lpt.fi
Subject: [rp-ml] de-powdering mass quantities of sintered parts?

Hi folks,

I'm with an RP lab at Boeing and we're looking for a way to save time and/or labor de-powdering parts from our nylon sintering machines. The quantities we build are increasing and it's getting cumbersome to do all the cleanup by hand.

Does anybody know of automated or mechanized methods for de-powdering?

Matthew Amend
Boeing Rapid Prototyping & Modeling
Laser Sintering Lab 9-120 12E3
206 662 7495
Received on Mon Jan 21 2013 - 23:56:21 EET

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