Page - 99 - in 3D Printing of Metals

Metals 2016,6, 280 Figure19.Theuseconditionsofstopper. According to thedesignmethod researchedbefore, the redesignprocesses of the stopper are shownas follows. 1.Modelbuildinganddesignof theskin Themodel canbemadeby3Dscanningand reverse engineering technology. Theoptimized thicknessof theskin is2mmaccordingto thepreviouswork. 2. Stopperstructureseveringandframeworkdesign The stopper canbedivided into fourparts by their force conditions and shapes: theL-shape structurewithbendingmoment, therectangularstructureonewithbendingmoment, therectangular structure twowithbendingmoments, andthe thin-wall structure. The frameworkofeachdivided partwasredesignedbythemethodstudied inSection3. Thentheredesignedstopperwasconnected bytheir topological relationship. Thereconstructionresult is showninTable2. Table2.Disassemblyofstopper. Number DesignObjects Shape Load DesignParameters Result 0 Skin Thicknessofskinβ 1 Lshape Bendingmoment Thicknessof frameλ 2 Rectangular Pressure Thicknessof frameηNumberof frameN1 3 Rectangular Pressure Thicknessof frameαNumberof frameN2 4 Thin-wall structure ∞ 3. Finiteelementanalysisanddetaildesignof thestopper Theoriginalandreconstructedstoppermodelswere introduced intoANSYSYWorkbench for finiteelementanalysis toshowthechangeofstressdistribution.Otherdetaileddesignssuchasfillets andpowderoutletswerecompleted in thisstage. Thetwostoppershavethesamemaximumstress. Inaddition, theaveragestressof theoptimizedstopperbecamelarger. Aloadof1000KNwasappliedto thebacksurfaceof thestopperwhile theboundaryconditions were added by its actual conditions. The stress distributions of the stopperwith different inner 99