DESIGN WORLD http://www.makepartsfast.com August 2019 53did 100 years ago, with the requirement
of significant manual intervention. And it
is this that is slowing the whole process
chain down for production applications
of AM.An innovative approach to
post-processing
There can be no argument about the
increased number and improved nature
of thermoplastic materials available for
AM processes in recent years. Alongside
these material developments, the AM
systems that produce thermoplastic
parts have also significantly improved in
resolution, accuracy, repeatability and
overall quality; they consistently meet
industrial requirements for exacting
prototyping and tooling.
Yet, the critical mass of production
applications remain lower than they
otherwise might be due to previously
mentioned limitations placed on the
overall process chain by the post-
processing phase. This is because
powder-bed processes — which
require significant powder handling
and removal post build — also require
infiltration operations, as well as finishing
processes, particularly if aesthetics
are important alongside the strength
advantages that laser sintering offers.
If colored parts are required, then this
is also applied at the finishing stages of
post-processing.
With filament thermoplastic material
processes, the nature of the AM
process (no matter how refined) results
in a stepping effect. The traditional
post-processing steps required to
eliminate these process-specific results
are considerable, costly, and time
consuming. However, an automated
post-processing solution for smoothing
high volumes of thermoplastic polymer
parts to an injection molded surface
quality would remove one of the biggest
hurdles to the serial production process
chain. Here, I am talking about parts
3D printed using Laser Sintering, Multi
Jet Fusion, High Speed Sintering, and
Fused Deposition Modeling processes
for specific material types includingPolyamide/Nylon, flame retardant Nylon,
glass filled Nylon, ULTEM, PMMA, TPU,
and TPEs.
One option, known as PostPro3D,
includes a range of hardware that
integrates new systems, software and
virtual services. The system is built on the
proprietary BLAST process.
Simplicity is the key. Post-build, 3D
printed parts can be removed from the
machine, loaded onto a rack, and placed
into the PostPro3D post-processing
chamber. The user then selects the
appropriate program and the process
starts and runs for 90-120 minutes,
after which the parts can be removed,
inspected, and fit for purpose.
During those 90 to 120 minutes,
3D printed parts are subjected to a
physiochemical process that involves
converting a proprietary but wholly
safe solvent into vapor under precisely
controlled vacuum and temperature
conditions. The process refines the
surface of each part for a perfectly
smooth finish, equivalent to that of an
injection molded part. Moreover, the
process also seals and strengthens parts,
essentially improving their mechanical
properties— such as elongation at break
— compared with how parts were when
they came out of the 3D printer.
PostPro3D systems have been
designed to connect through an IIoT
network where data are analyzed in
real-time. This allows for new insights
on process performance, which can
subsequently be shared amongst the
global fleet of PostPro3D machines, andThe PostPro3D
machine
from Additive
Manufacturing
Technologies.GET YOUR PARTS TO MARKET
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The Xcentric team understands your need to shorten the time to product launch. Our proprietary process and U.S. based
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we o er expertise in a wide range of injection molding applications.INJECTION MOLDING • CNC MACHINING • ADDITIVE MANUFACTURINGContact Us Today: xcentricmold.com | 586.598.4636
[email protected] | ISO 9001:2015 / ITAR / ULDesignWorld_HalfPage_Xcentric_FINAL.indd 1 7/3/19 11:14 AM
made available via software updates to
continually upgrade performance, all
while protecting individual IP. Moreover,
this connectivity capability also allows
for integration with other intelligent
devices and workflow automation
software across the production process
chain.
All of this points to a continued need
to work towards developing whole
process chains that will help convince
AM users, and potential AM users, that
the transition to AM for an increasing
number of production applications is
worthwhile and not nearly as complex
as it may have been, even a few years
ago. It demands a unified approach —
across the AM sector itself — to develop
more capable and connected systems,
while simplifying the overall process to
provide economically viable, automated
solutions.
Automated turnkey hardware
for post-processing — such as the
commercially available PostPro3D range
— is certainly a step forward for the
post-processing stage. However, there
are still more steps to take, in terms of
wholly connected, custom, end-to-end
digital manufacturing systems. nAdditive Manufacturing Technologies
http://www.amtechnologies.comPost Processing MPF 8-19_Vs3.LL.indd 53 8/5/19 11:37 AM