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Additive manufacturing (AM) opens new possibilities of obtaining ceramic green parts with a tailored complex design at low cost. Meeting the requirements of highly demanding industries (aeronautical and biomedical, for example) is still challenging, even for machining. Hybrid machines can solve this problem by combining the advantages of both additive and subtractive processes. However, little information is currently available to determine the milling parameters of additively fabricated ceramic green parts. This article proposes a systematic approach to experimentally determine the cutting parameters of green AM zirconia parts. Three tools, one dedicated to thermoplastics, one to composites, and a universal tool, were tested. The tool--material couple standard (NF E 66-520-5) was followed. The lower cost and repeatable generation of smooth surfaces (Ra < 1.6 µm) without material pull-out were the main goals of the study. The universal tool showed few repeatable working points without material pull-out, while the two other tools gave satisfying results. The thermoplastic tool ensured repeatable results of Ra < 0.8 µm at a four times lower cost than the composite tool. Moreover, it exhibited a larger chip thickness range (from 0.003 mm to 0.036 mm). Nevertheless, it generated an uncut zone that must be considered when planning the milling operations. [ABSTRACT FROM AUTHOR]

The use of technical ceramics is growing thanks to their high mechanical properties. To attain the tolerances and surface finish, operations including machining or grinding are performed. Due to the risk of fracture, they are limited to low material removal rates. One promising option is to rely on the hybridization of manufacturing process. This paper is linked to the project HyProPAM that combines additive and substractive techniques. An experimental methodology to determine the optimal milling parameters parts in Zirconia is proposed. Cutting forces and surface topography are used as indicator to determine the quality of the operation. [ABSTRACT FROM AUTHOR]