1 Department of Mechanical Engineering, Technical University of Denmark 2 Manufacturing Engineering, Department of Mechanical Engineering, Technical University of Denmark 3 Department of Management Engineering, Technical University of Denmark
Selective laser melting, as a rapid manufacturing technology, is uniquely poised to enforce a paradigm shift in the manufacturing industry by eliminating the gap between job- and batch-production techniques. Products from this process, however, tend to show an increased amount of defects such as distortions, residual stresses and cracks; primarily attributed to the high temperatures and temperature gradients occurring during the process. A unit cell approach towards the building of a standard sample, based on literature, has been investigated in the present work. A pseudo-analytical model has been developed and validated using thermal distributions obtained using different existing scanning strategies. Several existing standard and non-standard scanning methods have been evaluated and compared using the empirical model as well as a 3D-thermal finite element model. Finally, a new grid-based scan strategy has been developed for processing the standard sample, one unit cell at a time, using genetic algorithms, with an objective of reducing thermal asymmetries. © 2013 SPIE.
Proceedings of Spie, the International Society for Optical Engineering, 2013, Vol 8608
Analytical models; Cracks; Finite element method; Genetic algorithms; Laser applications; Laser beams; Scanning; Thermoanalysis; Three dimensional computer graphics; Three dimensional
Main Research Area:
Laser-based Micro- and Nanopackaging and Assembly VII, 2013