Instead of building plastic filaments layer by layer, a new approach to 3D printing raises complex shapes from a liquid container up to 100 times faster than conventional 3 – D-printing has been shown by researchers from the University of Michigan.
3D printing could change the game for relatively small production jobs and produce fewer than 1
"With conventional approaches, that's not really achievable unless there are hundreds of machines," said Timothy Scott, Professor of Chemical Engineering at UM, who co-developed the new 3-D printing approach with Mark Burns, the TC led Chang-Professor of Engineering at UM.
Their method solidifies the liquid resin with two light sources to control where the resin hardens and where it remains liquid. This allows the team to solidify the resin in more complex patterns. You can do a 3D bas-relief in a single shot instead of a series of 1D lines or 2D cross-sections. Her prints include a grille, a toy boat and a block M.
"It's one of the first true 3D printers ever made," said Burns, a professor of chemical engineering and biomedical engineering.
But the true 3-D approach is not a mere trick, but it has been necessary to overcome the limitations of previous tub printing efforts. Namely, the resin tends to solidify on the window through which the light shines through, and stops the print job as soon as it is started.
By creating a relatively large area where no solidification occurs, thicker resins – possibly with reinforcing powder additives – can be used to make more durable objects. The method is also well suited for the structural integrity of filament 3D printing, as these objects have weak points at the interfaces between the layers.
"You can get much harder, much more wear-resistant materials," Scott said.
An earlier solution to the problem of window consolidation was a window through which oxygen can pass. The oxygen penetrates into the resin and stops the solidification near the window. There remains a liquid film through which the newly printed surface can be pulled away.
But since this gap is only about as thick as a piece of clear tape, the resin must be very fast enough to flow into the tiny gap between the solidified object and the window when the part is pulled up. As a result, the pressure on the tub was limited to small, customized products that are treated relatively gently, such as. As dental equipment and shoe inserts.
By replacing the oxygen with a second light to stop solidification, the Michigan team can create a much larger gap. The object and the window – millimeters thick – allow the resin to flow a thousandfold faster.
The key to success lies in the chemistry of the resin. In conventional systems, there is only one reaction. A photoactivator hardens the resin wherever light shines. In the Michigan system, there is also a photoinhibitor that responds to a different wavelength of light.
The Michigan team can not only control solidification in a 2-D plane, but, as is the case with conventional tub printing techniques, the two patterns determine types of light to apply the resin to virtually every 3-D To harden in the vicinity of the lighting window.
UM has filed three patent applications to protect the many inventive aspects of the approach, and Scott is preparing to launch a startup company. [19659004Anarticleofthisresearchispublishedin Science Advances entitled "Fast, Continuous Additive Manufacturing by Volumetric Polymerization Inhibition Patterning".
Volumetric 3D printing builds on the need for speed
"Fast, Continuous Additive Manufacturing by Volumetric Polymerization Inhibition Patterning" Science Advances (2019). advances.sciencemag.org/content/5/M/eaau8723
University of Michigan
3D printing with light 100 times faster (2019, 11th January)
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