Medical Design Briefs - August 2021 - 51

" There is really no way to effectively reach
those areas with any sort of other tool.
Right now, we are making more and more
complex parts, especially when it comes to
housings with ports all over the part. "
For best results for medical devices, the
deburring tool is typically rotated into the
main bore into which the cross holes
break. After a few clockwise strokes, the
tool is removed, and the spindle reversed
to rotate and stroke the flexible hone in a
counterclockwise direction for a few more
strokes. The forward and reverse rotation
creates a symmetrical deburring pattern.
Coolant should be used to keep metal cuttings
and deburred metal in suspension.
According to Garaczi, removing burrs
can be particularly problematic when dealing
with machined superalloys, such as
titanium, Monel, Inconel, Incoloy, Invar,
Rene, and Hasteloy, which are some of the
most difficult materials to machine.
" The burrs are one of the biggest problems,
particularly when machining superalloys, "
says Garaczi. " Even during 'grooving,'
if you cut the material from one side,
it just pushes the burr to the edge; and if
you approach it from the other side, it just
pushes it back. It doesn't want to break off
the material cleanly. As soon as the tool
gets a bit dull it gets a lot worse. So, sharp
tools with the right geometry are key. "
Garaczi notes that the Flex-Hone is
available with a premium nickel-coated
diamond abrasive for use on materials like
carbide, ceramic, and steel alloys; as well as
a CBN (cubic boron nitride) option that is
even harder and is specifically designed
for superalloys, which can exhibit of high
ductility and work hardening that produce
Before
a gummy machining behavior if the correct
abrasive tool is not utilized.
He notes that when deburring superalloys
such as titanium or 13-8 stainless alloy,
utilizing the Flex-Hone has been very helpful.
" Most of the 13-8 we machine is heattreated,
so it is subject to significant burrs.
The hone is ideal for removing even the
most stubborn burrs, " says Garaczi.
Garaczi is installing the flexible hones
into CNC equipment to automate the
After
Medical devices often have precision components that utilize through holes that must be cross-hole
deburred. (Credit: Brush Research Manufacturing)
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Medical Design Briefs, August 2021
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Medical Design Briefs - August 2021

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