2 results listed
Additive Manufacturing provides opportunity to create complex geometries, overhanging sections and
intricate hallow surfaces which are not possible or too difficult to manufacture by subtracting methods.
Support structures are essential to build these complex geometries which cannot withstand the gravity
during layer-by-layer manufacturing processes. After finishing building process, the support structures
have to be removed from the part. However, removing these support structures is time consuming
process and may decrease surface quality of the products. Water soluble polymer support materials are
promising solution for decreasing support removing process time and increasing surface quality. In
this study it is aimed to define optimal process parameters for generating water soluble support
structures by dual extruder. Polylactic Acid (PLA) was used as part and support material while
Polyvinyl Alcohol (PVA) was used as water soluble support material. PLA-PVA hybrid structure was
built by Fused Deposition Modeling (FDM) system with dual extruder. Different process
temperatures; 185-230°C and XY spacing; 0.2-08 mm, between support and object were tried for
obtaining support structures which maintains its strength throughout the process and then be removed
away easily. PLA supports were cleaned mechanically while PVA were solved in deionized water.
The results were compared in terms surface quality of the samples. It can be reported that water
soluble polymer usage increased surface quality of the samples.
International Congress on 3D Printing (Additive Manufacturing) Technologies and Digital Industry
3D-PTC2019
Binnur Sağbaş
Tumay DİCLE
Birol ÖZÇEVİK
Mehmet Can ÇATAL
Direct metal laser sintering (DMLS) is a kind of additive manufacturing (AM) method which uses
powder bed fusion technology for building up near net-shape parts. Although it provides opportunity
to create complex geometries, surface quality is still insufficient. Post processes are generally applied
to AM parts for increasing surface quality. In this study tribological performance of AlSi10Mg
surfaces, manufactured by DMLS were investigated. Sample surfaces were post processed by shot
peening and polishing operations. Surfaces were characterized in terms of 2D profile and 3D areal
surface roughness parameters. Roughness measurements were taken by both mechanical and optical
profilometers. Tribological properties were investigated by ball-on-disc tribotester. 6 mm diameter
Al2O3 balls were used as counter face. Tests were applied under 10N load and deionized water was
used as lubricant. Wear amounts were determined by measuring weight loss. The results showed that
surface finishing operations strongly affect the surface properties and tribological behavior of the
samples.
International Congress on 3D Printing (Additive Manufacturing) Technologies and Digital Industry
3D-PTC2019
Binnur Sağbaş