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Development of Texture Mapping Approaches for additively Manufacturable Surfaces

Chinese Journal of Mechanical Engineering 2022年第4期35卷 125-138页

作者： Bhupesh Verma Omid Zarei Song Zhang Johannes Henrich Schleifenbaum Chair for Digital additive Production RWTH Aachen University52074 AachenGermany

manufacturing(AM)technologies have been recognized for their capability to build complex components and hence have ofered more freedom to designers for a long *** ability to directly use a computer-aided design(CAD)model has allowed for fabricating and realizing complicated components,monolithic design,reducing the number of components in an assembly,decreasing time to market,and adding performance or comfort-enhancing *** of the features that can be introduced for boosting a component functionality using AM is the inclusion of surface texture on a given *** inclusion is usually a difcult task as creating a CAD model resolving fne details of a given texture is difcult even using commercial software *** paper develops a methodology to include texture directly on the CAD model of a target surface using a patch-based sampling texture synthesis algorithm,which can be manufactured using *** for the texture generation algorithm can be either a physical sample or an image with heightmap *** heightmap information from a physical sample can be obtained by 3D scanning the sample and using the information from the acquired point *** obtaining the required inputs,the patches are sampled for texture generation according to non-parametric estimation of the local conditional Markov random feld(MRF)density function,which helps avoid mismatched features across the patch *** generating the texture,a design constraint to ensure AM producibility is considered,which is essential when manufacturing a component using,e.g.,Fused Deposition Melting(FDM)or Laser Powder Bed Fusion(LPBF).The generated texture is then mapped onto the surface using the developed distance and angle preserving mapping *** implemented algorithms can be used to map the generated texture onto a mathematically defned *** paper maps the textures onto fat,curved,and sinusoidal surfaces for *** the texture m

关键词： Texture synthesis design for additive manufacturing Image processing Textured surface generation Texture mapping

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A Direct Toolpath Constructive design Method for Controllable Porous Structure Configuration with a TSP-based Sequence Planning Determination

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Chinese Journal of Mechanical Engineering(additive manufacturing Frontiers) 2023年第1期2卷 34-46页

作者： Zhiping Wang Yicha Zhang Donghua Dai Dongdong Gu Chaoyue Chen Di Wang Alain Bernard Laboratoire des Sciences du Numérique de Nantes(LS2N) Nantes44321France Nantes Université Ecole Centrale de NantesNantes44321France Universitéde Technologie Belfort-Montbéliard(UTBM) ICB-COMMSevenans90400France Jiangsu Provincial Engineering Laboratory for Laser additive manufacturing of High-Performance Metallic Components College of Materials Science and TechnologyNanjing University of Aeronautics and AstronauticsNanjing210016China State Key Laboratory of Advanced Special Steels School of Materials Science and EngineeringShanghai UniversityShanghai200444China School of Mechanical and Automotive Engineering South China University of TechnologyGuangzhou510641China

The inherent capabilities of additive manufacturing(AM)to fabricate porous lattice structures with controllable structural and functional properties have raised interest in the design methods for the production of extremely in-tricate internal *** popular methods of porous lattice structure design still follow the traditional flow,which mainly consists of computer-aided design(CAD)model construction,STereoLithography(STL)model conversion,slicing model acquisition,and toolpath configuration,which causes a loss of accuracy and manufac-turability uncertainty in AM preparation ***,toolpath configuration relies on a knowledge-based approach summarized by expert *** this process,geometrical construction information is always ignored when a CAD model is created or *** fully use this geometrical information,avoid accuracy loss and ensure qualified manufacturability of porous lattice structures,this paper proposes a novel toolpath-based con-structive design method to directly generate toolpath printing file of parametric and controllable porous lattice structures to facilitate model data exchange during the AM preparation *** optimize the laser jumping route between lattice cells,we use a hybrid travelling salesman problem(TSP)solver to determine the laser jumping points on contour *** kinds of laser jumping orders are calculated and compared to select a minimal laser jumping route for sequence planning inside lattice ***,the proposed method can achieve high-precision lattice printing and avoid computational consumption in model conversion stages from a geomet-rical *** optical metallographic images show that the shape accuracy of lattice patterns can be *** existence of“grain boundaries”brought about by the multi-contour scanning strategy may lead to different mechanical properties.

关键词： design for additive manufacturing Toolpath-based constructive design Porous structure Sequence planning

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