Profile Invalidation Additive Manufacturing And Its Key Algorithm Issues

Profile Invalidation Rapid Prototyping (PIRP) is a newly proposed additive manufacturing approach. PIRP hosts a LOM-like contour cutting feature, but uses coated powder instead of sheet. It merits time saving, cost cutting, stress led deform preventing, elevated capability and wider processing window. However, the fundamental mechanism of PIRP is previously kept untouched. Added is that the CAD model translation costs accuracy due to triangular representation, and topology flaw occurred is again a harsh puzzle. Another challenge worth of mention comes that profile disjunction definitely lead to a leaked surface, directly put the decubing work in dilemma. To push PIRP out of all those mess, essential experiments were carried, and algorithm key issues were studied.The coated sand is pretty saving for PIRP use, so heating and laser scanning experiments to it means more. The micro scope imaging of heated sand could see material state changing a lot, such as resin soften, heat damage, decompose, and partial melt. Meanwhile the cross section of scanned line could tell heat affected zone. All those observations, together with some theory analyze deduct the laser invalidation and material curing mechanism. This serves as precondition for processing parameter and new material selection.A new STL handle algorithm was proposed out of existing methods. The redundant triangular nodes were merged by quick sort, and a half edge data structure could be constructed beyond. On the topology representation, non manifold edges and holes were removed, inverted normal bug get fixed. Then employ the active patch list, slicing STL file. For the first time, a growing neural gas (GNG) network receives a proposal to deal with topology learning for slicing point cloud. The point cloud topology mutation and widen problem motivate a revision on GNG. How the GNG parameters differentiate its learning process get discussed here. The profile Boolean relations contribute to area extraction task for PIRP. Last but not the least, the invalidation surface leak problem see the answer, parallel polygon Boolean operations. To validate proposed algorithm, case study were analysed.