Powder metallurgy offers products characterized by unique properties and minimum material waste. However, the deformation in debinding and sintering phases and the limited attainable surface finish, may requires additional manufacturing steps for enabling high-quality components production. Recent developments in micro components fabrication by extrusion and in extrusion-based additive manufacturing, have been trying to adopt metal polymeric feedstock for producing high-end components for biomedical and other relevant industrial fields. At the same time, to enhance product quality these manufacturing process chains requires the integration at different phases of machining operations. This paper studies the micromachinability of AISI316L feedstock at green-state, aiming on geometrical features obtained on hot-pressed discs, by using a 0.5 mm diameter end-mill. The work analyzes the effect of pressing parameters combined with machining parameters on surface roughness and integrity of machined slots. 3D microscopy and cutting force acquisition were adopted. Quality of sintered components were also analyzed. Machinability of green parts resulted limited, especially considering the achievable roughness and the damages occurred at slot edges. However, proper combination of cutting parameters led to better results indicating that potential benefits can be achieved. On the other side, debinding and sintering phases confirmed as critical phases that can potentially invalidate the production of good components but their performance seemed not compromised by previous micromilling operations.

Green-state micromilling of AISI316L feedstock

PARENTI, PAOLO;KURIAKOSE, SANDEEP;MUSSI, VALERIO;STRANO, MATTEO;ANNONI, MASSIMILIANO PIETRO GIOVANNI
2017

Abstract

Powder metallurgy offers products characterized by unique properties and minimum material waste. However, the deformation in debinding and sintering phases and the limited attainable surface finish, may requires additional manufacturing steps for enabling high-quality components production. Recent developments in micro components fabrication by extrusion and in extrusion-based additive manufacturing, have been trying to adopt metal polymeric feedstock for producing high-end components for biomedical and other relevant industrial fields. At the same time, to enhance product quality these manufacturing process chains requires the integration at different phases of machining operations. This paper studies the micromachinability of AISI316L feedstock at green-state, aiming on geometrical features obtained on hot-pressed discs, by using a 0.5 mm diameter end-mill. The work analyzes the effect of pressing parameters combined with machining parameters on surface roughness and integrity of machined slots. 3D microscopy and cutting force acquisition were adopted. Quality of sintered components were also analyzed. Machinability of green parts resulted limited, especially considering the achievable roughness and the damages occurred at slot edges. However, proper combination of cutting parameters led to better results indicating that potential benefits can be achieved. On the other side, debinding and sintering phases confirmed as critical phases that can potentially invalidate the production of good components but their performance seemed not compromised by previous micromilling operations.
Proceedings of the 2017 World Congress on Micro and Nano Manufacturing: A Joint Conference of ICOMM/4M/IFMM
978-986-05-2101-6
micromilling, process chain, powder metallurgy, surface quality, AISI 316L feedstock
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11311/1031423
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