Recently, I study master degree in Taiwan. And my research topic is about metal 3-d printing with in718. I am required to decrease surface roughness in overhanging structure or inclined cube. Is there any suggestion or any website for me?
Slow and uniform scan speed of the laser, small powder size, adopt full melting, small layer thickness to ensure good bonding
For standard metal AM systems, this largely depends on a combination of the processing parameters (power, speed, scan strategy...) with principle effects stemming from the post-contour scans, and of course the incline geometry. I highly recommend publications from my colleague, Jason Fox. For example: Article Effect of Process Parameters on the Surface Roughness of Ove...
Additionally, Dr. Fox has provided an exemplary dataset which includes measure of surface finish at varying overhang angles: Article Variation of Surface Topography in Laser Powder Bed Fusion A...
Another factor depends on the relationship between laser incident angle and the overhang position. The following is a great example: Article Surface Roughness in Laser Powder Bed Fusion – Interdependen...
Additionally, there is a handful of publication/groups that have examined use of more complex scan strategies that tailor the laser power based on the overhang (or other) geometry. This publication from Ho Yeung describes one such method, in addition to reviewing similar works: Article Part Geometry and Conduction-based Laser Power Control for P...
The relationships between the processing parameters, part geometry, and resulting surface finish is very complex, but hopefully these provide an example of research regarding in-situ methods. Keep in mind there are variety of secondary surface finishing methods (machining, shot peening, laser shock peening, electro-polishing, etc.), or use of secondary finishing systems within and during the AM processing (e.g., hybrid additive-subtractive AM).
Dependent on the construction and printer design, the finishing process can also be considered for imfluencing the surface roughness.
Conference Paper Additive manufacturing of reflective optics: evaluating fini...
Conference Paper Concepts for integrating laser polishing into an additive ma...
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