An eXtended Manufacturing Integrated System for feature based manufacturing with STEP-NC

International audienceCNC feature-based programming with STEP-NC standard extends the collaborative model of manufacturing data exchange all along the numerical data chain. This paper considers the mutations related to this approach from the manufacturing system level to the industrial enterprise as a whole. The eXtended Manufacturing Integrated System concept is introduced to fill in the gap of the current manufacturing data exchange bottleneck. It is composed of eXtended CAD and eXtended CNC systems to link the CAD model to the real machined part through the Manufacturing Information Pipeline. The contributions associated with these concepts are demonstrated through a validation platform implemented on industrial CNC manufacturing equipments

Learning data-driven reduced elastic and inelastic models of spot-welded patches

Solving mechanical problems in large structures with rich localized behaviors remains a challenging issue despite the enormous advances in numerical procedures and computational performance. In particular, these localized behaviors need for extremely fine descriptions, and this has an associated impact in the number of degrees of freedom from one side, and the decrease of the time step employed in usual explicit time integrations, whose stability scales with the size of the smallest element involved in the mesh. In the present work we propose a data-driven technique for learning the rich behavior of a local patch and integrate it into a standard coarser description at the structure level. Thus, localized behaviors impact the global structural response without needing an explicit description of that fine scale behaviors

Method to obtain hybrid rapid tools with elementary component assembly

M. Rivette, P. Mognol, J.Y. Hascoet, (2013) "Method to obtain hybrid rapid tools with elementary component assembly", Rapid Prototyping Journal, Vol. 19 Iss: 2, pp.77 - 87 DOI : 10.1108/13552541311302923Purpose – The purpose of this paper is to propose a method to obtain hybrid rapid tools with elementary component assembly. Design/methodology/approach – The authors' method proposes a functional representational model, starting with the product features, analyzed from three points of view: a feasibility analysis; a manufacturing analysis; and an assembly and synthesis analysis. This method, based on CAD STEP AP-224 data, makes it possible to obtain an exhaustive list of solutions for the module. The work is illustrated with an industrial example. To construct the Assembly Identity Card (AIC) and test the various parameters that influence the quality of the injected parts, a hybrid injection mold has been produced. The methodology associated with the use of this AIC uses a “representation graph”, which makes it possible to propose a set of valid solutions for assembling the various tooling modules. This method is validated by industrial example. Findings – The product part is decomposed into a multi-component prototype (MCP), instead of being made as a single part, which optimizes the manufacturing process and enables greater reactivity during the development of the product. Research limitations/implications – The final goal is to propose a software assistant used in association with CAD system during the design of hybrid rapid tooling. An important work concerning the features recognition must be implemented. The assembly of the different parts of the hybrid rapid tooling must be considered and optimized. Practical implications – This method allows the selection of the best process technologies from manufacturing tools. Originality/value – The analysis of manufacturing hybrid rapid tooling has not been studied previously

Etude de la zone fondue et de l'usure des electrodes en relation avec les donnees technologiques du soudage TIG en vue d'applications en robotique

SIGLECNRS T Bordereau / INIST-CNRS - Institut de l'Information Scientifique et TechniqueFRFranc

Génération de trajectoires de tréflage et d'usinage trochoïdal pour le vidage de poche

Le vidage de poche est une problématique centrale du fraisage d'ébauche. Malgré les évolutions technologiques, aucune évolution majeure n'a été observée récemment concernant les trajectoires d'usinage de ces entités. Le tréflage et l'usinage trochoïdal sont de nouveaux types de stratégies qui ont trouvé des applications dans l'usinage d'ébauche des matériaux durs. Cet article vise à évaluer leur potentiel pour le vidage de poches dans des alliages d'aluminium. Des algorithmes de génération de trajectoires de tréflage et de trochoïdes ont ainsi été développés en cherchant un compromis entre productivité et qualité des surfaces obtenues. Une étude expérimentale a également été menée. Deux machines outils ont été utilisées, l'une sérielle à 3 axes, l'autre parallèle à 5 axes. Les résultats de cette étude conduisent à une meilleure connaissance de ces nouvelles stratégies d'usinage, en vue de leur application au fraisage d'ébauche d'alliages légers

Opening new opportunities for aeronautic, naval and train large components realization with hybrid and twin manufacturing

Additive Manufacturing (AM) consist in producing parts by depositing material in successive layers. These step-by-step processes proposes new innovative directions for high value components: complex geometries are accessible without strong efforts (such as hollow or lattice structures which dramatically reduce the component weight while keeping their at least similar mechanical properties), assemblies can be simplified, spare parts can be realized at demand... Hence, AM has benefitted from large research efforts over the last decade, almost all existing industrial sectors have benefitted from them. This paper introduces some opportunities and the associated challenges attached to Additive Manufacturing, to produce large metallic components for naval aeronautics and train industries. In particular, two innovative approaches are discussed in details: hybrid manufacturing and twin manufacturing. Hybrid manufacturing consists in integrating AM together with other processes for the realization of components, with the objective to benefit from the interests of each process while avoiding its drawbacks. Hence, AM can realize complex geometries or offer low buy-to-fly ratios while high speed machining generates very good surface properties (position, roughness). Processes can be carried out sequentially or simultaneously on the features to manufacture and finding the optimal manufacturing work plan can be challenging. The paper introduces some hybrid approaches developed in the laboratory. Twin manufacturing uses models and multiphysics simulation methods to create a digital clone of the process implementation within the manufacturing environment. Manufacturing preparation and optimization can be carried in the virtual workshop where various configurations and choices can be tested before being selected. To enhance its accuracy, the digital twin can also be fed by monitoring data captured during the process. Several digital twins developed in the laboratory are provided. The paper is illustrated with several proof-of-concept parts made with SLM, LMD, WAAM and hybrid approaches in the laboratory. Among them, a hollow propellers that has the same hydrodynamics efficiency for a reduced weight for the naval industry, an aircraft structural panel that demonstrates simplified assemblies increased performance/mass ratio, a train component that shows the ability to produce structural parts at demand

Novel one-degree of freedom helix machine architecture for additive manufacturing

Additive manufacturing has been relying on conventional machinery architecture. Conventionally, the architecture used is a Cartesian set-up. The X-Y-Z axis move independently to move the tool on the X-Y plan and increment the Z-axis when the layer is finished. The machine architecture in this paper simplifies the design by constraining the machine to have solely one-degree of freedom. One degree of freedom is also known as a helix linkage. If individually controlled tools are placed all along the rotating arm, then this movement allows an opportunity to deposit material in a single sweeping motion. To increase furthermore the output, multiple arms can be added at a fixed angle. Finally, because of the predictive motion, multiple helix machines can be synchronized to create collaboratively a bigger part. This type of manufacturing process has potential applications in binder jetting, material jetting, and selective laser sintering

Integrated Design Applied to Marine Propellers: Effects of Surface Roughness on Hydrodynamic Performance

International audienc

Marine Propeller Integrated Design : Influence on Manufacturing Strategy on Bi-Dimensional Foil Performance

International audienc

Generation of safe and intelligent tool-paths for multi-axis machine-tools in a dynamic 2D virtual environment

International audienc