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Letter 26151
De-burring and polishing Inconel
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My company is currently machining a product out of Inconel 718
unfortunately I can not show you what the product looks like because
we are making this product for another company under license, however
the item is around 25`` long, 4`` in diameter and has series of
grooves and milled pockets. The problem we currently have now is that
there is a lot of de-burring to be done, this is matriculas and a
time consuming job. We are currently using a small pencil grinder
with a stone burr. I believe that the resin-bonded points should be
of regular aluminium oxide brown (is this correct?). The points that
I require are a ball (10mm dia) and a tapered (10mm dia) but am
having a hard time finding them in the required bond. I am able to
get them made up but would much prefer to get them `of the shelf` the
next question is how would I go about polishing the item to a bright
finish?
David Miller
Production Engineer - Perth, W.A, Australia
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Can't help you with the grinding supplies; however, just wanted to
suggest you look at spin or drag finishing these parts. From the part
size and weight, I think this part would be an excellent candidate
for that process provided there is some reasonable quantity.
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To follow up on Tony Kenton's comment, it might also be possible
to produce needed edge finishing by fixturing the part inside a tub
shaped vibratory finish machine. This would have atendency to
increase the force of media to part surface contact and would
facilitate the use of smaller media, if needed for feature access.
Uniform processing coverage might require some measure of in-process
or mid-process part positioning on the fixture.
David A. Davidson
finishing specialist - Spokane, WA
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