SAMPE Journal - November/December 2021 - 81

feed angle changes while switching. To reduce the
angular change of the hoppers, the radius from
pivot point to the feed entrance was increased.
As sliding occurs, pellets blocking the motion
must either move into the extruder or shear at the
interface of the sliding metal. These locations were
fabricated using hardened steel to prevent wear.
The piston motion could be adjusted by tuning the
location of the end stop bolts (Figure 1b) to align
the interface between the feed tube and extruder
entrance.
One of the common issues in working with
a pelletized feedstock is the containment of the
materials in the feed lines. CF dust and pellets are
often found around the system throughout the
build time, which can result in defects in the part.
Also, dust and pellets can block the motion of the
switching mechanism and jam the feed lines. To
mitigate these issues, two holes were added to the
sliding locations to allow for the excess dust and
pellets (i.e. occurs during the switching process) to
exit the system without damaging any of the system
components, see Figure 1b. Applying the dual feed
system design to the current BAAM extruder results
in system capable of feeding from two separate
dyers or blenders, enabling the deposition of
functionally graded material or multi-material
extrusion (Figure 2)
The BAAM system was fitted with two 272kg
(600lb) dryers (DRI-AIR model RH600), used
for drying the feedstock materials before the
deposition process, as seen in Figure 3. A blender
(Maguire model WSB-100 Series) with a precision
mixer that is capable of mixing four different
Figure 2. BAAM extruder equipped with dual
hopper system.
materials up to 59 kg/ hr (130lb/hr) was added to
the system, see Figure 3. The blender is used for
precision mixing of additives, expandable foaming
spheres, chemical foaming agents, and various
other functional materials. The mixer is equipped
with four hoppers such that any ratio between
various materials can be accomplished during a
single build. After mixing, the material is shuttled
to the dual hopper system integrated to the BAMM
extruder.
Figure 3. BAAM equipped with dual dryer and blender with zoom out of blender showing hoppers and
mixing chamber.
www. sampe.org
NOVEMBER/DECEMBER 2021
|
SAMPE JOURNAL |
81
http://www.sampe.org

SAMPE Journal - November/December 2021

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