Medical Design Briefs - May 2024 - 23
tive and machine shops, integrated inside
a computer numerical control or
CNC machine. The new hybrid setup
creates parts using precise computer
programming and two welding heads.
In a demonstration, the two welding
heads worked one right after the other on
a circular layer to print two metals, each
with
specific
advantages. A corrosionresistant,
stainless-steel core was created inside
an outer casing of cheaper " mild " steel
like that used in bridges or railroads. Since
the metals shrink at different rates as they
cool, internal pressure was created - essentially
clamping the metals together.
Tests on the result showed greater strength
than either stainless steel or mild steel has
on their own.
Currently, 3D printing with multiple
metals in a welding setup requires stopping
and changing metal wires. The new
method eliminates that pause and puts
two or more metals in the same layer
while the metals are still hot.
" This method deposits the metals in a
circle instead of just in a line. By doing
that, it fundamentally departs from
what's been possible, " says Lile Squires, a
WSU mechanical engineering doctoral
student and the study's first author. " Going
in a circle essentially allows one material
to bear hug the other material,
which can't happen when printing in a
straight line or in sandwiched layers. "
The capability to strengthen 3D printed
metal parts layer-by-layer could give
automotive shops new options soon with
the ability to quickly create strong, customized
steel parts. Bimetallic, torqueresistant
axle shafts, for instance, or
cost-effective, high-performance brake
rotors could be developed.
In the future, the researchers see the
potential for medical manufacturing
processes that print joint replacements
with durable titanium on the outside
Your medical cannula can be
micro-molded at scale...
for less cost.
In this video, a demonstration of the new 3D printing
method shows two welding heads working one right
after the other on a circular layer to print two metals:
an outer casing of cheaper " mild " steel and a corrosionresistant,
stainless-steel core inside. (Credit: Washington
State University)
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Medical Design Briefs, May 2024
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Medical Design Briefs - May 2024
Table of Contents for the Digital Edition of Medical Design Briefs - May 2024
Medical Design Briefs - May 2024 - Cov1
Medical Design Briefs - May 2024 - Cov2
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