R&ID

Septembre 2017

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FCTUL

Faculdade de Ciências e Tecnologia e Universidade Nova de Lisboa
(Faculty of Science and Technology and Universidade Nova de Lisboa - PORTUGAL)

Mechanical Engineering Department

“Dimensional and Mechanical Evaluation of Parts Produced on the 3D Printer M1 Cusing”

Autor

João Carlos Ferreira Bento

Dimlaser

Dimlaser as co-participant in the project

Some Key Objectives of the Study


  • The main objective of this dissertation was to study the influence of the production parameters (laser power, thickness per layer and laser speed) on some mechanical properties / responses (roughness, hardness, yield stress, stress at fracture and nominal extent) of standard test pieces according to ASTM E08-01. These specimens were produced using 316L steel by 3D printing on the M1 Cusing printer, which uses the SLM printing method.
  • The variable that was considered the most significant was the power of the laser. The increase of this variable positively influences roughness and hardness and negatively the nominal extent. The thickness per layer also had influence in the result obtained for the hardness response. Its increase has the consequence of decreasing the hardness of the material. On the other hand, the variable speed of the laser did not significantly influence any of the studied responses.

Some Key conclusions


  • It was possible to conclude that the parts produced by 3D printing, namely in SLM and using 316L steel, presented minimal dimensional deviations (being therefore an aspect to be valued) and mechanical properties (hardness, yield strength and tension rupture) higher than the tabulated values ​​(which reveals that the 3D printing process is quite acceptable and feasible).
    • It was also possible to conclude that the process of producing parts by 3D printing is more suitable for the production of parts that have a very complex geometry, since the production time and associated costs are the same as those required for the production of a simple piece.