Located in North Billerica, MA, USA, SI2 Technologies, Inc. designs, develops, and manufactures antennas, arrays and absorber systems. SI2’s mission is to deliver the Department of Defense military air, land, sea and space applications that address the complex and ever-changing battlefeld issues facing today’s military personnel. In short, SI2’s core mission is to ‘make things smart’ by pushing the boundaries of where antennas can be placed and how they can be made.
SI2’s mission requires the latest technology and innovation in the additive manufacturing feld to deliver an advantage to the warfighter. Much of the development work that SI2 does happens in their state-of-the-art facility. Among their collection of modern equipment, SI2 has 3D printers ranging from entry-level consumer 3D printers to much more expensive and complex wide format inkjet equipment.
Although SI2 had a range of 3D printers and wide format inkjet printers, they didn’t have a single machine that could combine these two capabilities. RIZE’s patented hybrid Augmented Polymer Deposition process solved this problem, simultaneously extruding engineering-grade thermoplastic and jetting functional inks precisely where they are needed in the part.
SI2 was also impressed with RIZE’s best-in-class Z-strength for functional parts, as well as the speed and ease of getting a part in hand, due to RIZE’s unique minimal pre- and post-processing capabilities.
The advantages provided to SI2 by their RIZE ONE 3D printer enable the production and testing of a variety of military functional projects.
One recent application where SI2 used their RIZE ONE 3D printer was to produce an end-use airfow controller for an airfow chamber apparatus. The apparatus was designed in SOLIDWORKS and printed in four separate pieces on the RIZE ONE that were later bolted together into one unit. These parts were then incorporated into a larger chamber where they will help control the fow of air. Additional pieces can be introduced at a later time to further direct the airfow.
Aaron Rathmell, Senior Scientist at SI2, said he selected RIZE for this application because, unlike his other additive manufacturing technologies, he was confdent that RIZE ONE would produce the four large parts required for the airfow chamber apparatus without warping. Part accuracy was critical for the apparatus because the parts must ft together precisely, as well as on the sheet metal adapter base, so air doesn’t fow out of any cracks between parts or between the parts and the base. Dr. Rathmell also mentioned that release ink jetted by RIZE ONE enables fast and simple post-processing. Without the RIZE ONE release ink capabilities, the type of supports needed for the air chamber parts would require much more complex post-processing work on other 3D printers.
“The only alternative to RIZE for these parts would be injection molding at a cost of $2K per part and a turnaround time of approximately 3-6 weeks. We had a deadline of one week to deliver the assembly to our client. With RIZE, we met our deadline at a cost of $143,” said Aaron. “On top of that, RIZE ONE is very reliable.”
SI2 has also used their RIZE ONE to produce a 4”x4” Vivaldi Notch test apparatus. Eventually, this test apparatus will be scaled up to full size for a military application. Aaron and his team mounted an antenna onto one side of the test fixture and a splitter on the other. It was fed with passive splitters where a two-way splitter fed a pair of eight-way splitters to provide an equal excitation to all 16 channels. The array apparatus, complete with the array and splitters, was placed in an anechoic chamber for testing.
“We selected RIZE for this application due to strong interlayer bonding in RIZE parts and the build plate size required for this part,” said Aaron. “With easy and fast postprocessing, the antenna support took less than a day to print and use in testing.”
“SI2 is exploring a number of custom applications for RIZE’s ink marking capability. Moreover, they are using RIZE to produce tabletop signs for sales purposes. They place the SI2 logo on the curved part as a visual way to inform customers about their 3D printing capabilities and applications.”
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