Design for 5-Axis CNC Machining Post Processing of Additively Manufactured Metal Parts


Sezer H. K.

Innovative Approaches in Additive Manufacturing Congress (IA4AM), Ankara, Turkey, 16 July 2021, pp.81-83

  • Publication Type: Conference Paper / Full Text
  • City: Ankara
  • Country: Turkey
  • Page Numbers: pp.81-83
  • Gazi University Affiliated: Yes

Abstract

Additive manufacturing (AM) enables achieving “complex” geometries which are not possible with conventional

manufacturing methods. Despite this revolutional advantage, some drawbacks resulting from the nature of the process must

be addressed. Layer by layer/additive manufacturing brings insufficient surface quality, anisotropy, porous structure, lack of

fusion, crack formation, residual stress, finishing necessity, coarse tolerances. Especially good surface finish is extremely

crucial for applications in Aerospace Industry and the current technological level of AM systems requires labor intensive

post-processing operations in this regard. In addition to de-powdering, heat treatment, chemical operations; CNC machining

is also one of the most important post-process operations of AM parts. While designing AM parts, such post-processes should

be taken into consideration. In this study, basic design considerations for 5-axis CNC machining of the AM parts are

proposed as the result of machine shop experience gained during 5 axis CNC machining of AM aerospace parts. Machining

before separation from the build-plate, using 5 axis CNC capabilities to separate the parts from build-plate by slot cutter,

leaving sufficient excess material for machining, and using support structure as potential fixture material can be summarized

as the design methodology proposed in this study.