Wyniki 1-1 spośród 1 dla zapytania: authorDesc:"Krzysztof Bobrowski"

Numerical analysis of mechanical properties of an infill structure used in 3D printings DOI:10.15199/28.2018.1.3

  1. INTRODUCTION 3D printing is one of the techniques used for the direct conversion of a 3D numerical model (created using the CAD design technique) to its physical prototype. Initially, the 3D printing was used to create some physical visualizations of models. Currently, the 3D printing plays an increasing role in the prototype production and the small batch production. Apart from conventional processes such as milling, the 3D printing gives an opportunity for some rapid production of elements as well as for examination in terms of their functionality without the necessity to run some complex production facilities. Plastics are the main materials used for the 3D printing, e.g. especially popular are ABS (acrylonitrile-butadiene-styrene), PLA (Polylactic acid), nylon or Laywood (fabric, wood-like, composite wood and plastics). Less conventional materials are resins, rubbers, metals or even concrete [1÷3]. 1.1. Technology of 3D printing In contrast to traditional forming methods, the 3D printing is an additive manufacturing technology. The element is formed by adding the material without any shaping or removing it. Due to the use of different building materials and technologies, several printing techniques can be distinguished. Especially popular are stereolithography (SLA), fused deposition method (FDM), selective laser sintering (SLS) or MultiJet Modelling (MJM). The most commonly used method as well as the cheapest form of the printing (both in terms of the printer cost and the operation cost) is the FDM [4]. Layer by layer, the 3D model is produced by extruding small flattened strings of molten material. Printer nozzles heat the material to the molten point. The thermoplastic is heated into their glass transition temperature and is then formed by an extrusion head. Numerical controlled printer’ head produces a layer of the prototype on the platform in the printout XY plane. Moreover, to prevent against the fall down [...]

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