The application of techniques to improve the surface finish pieces obtained by fused deposition modelling, as well other functional aspects, is great interest nowadays. Polylactic acid, a biodegradable material, has been considered possible substitute for petroleum-based polymers. In this work, different chemical post-processing methods are applied polylactic acid modelling and some characteristics studied. Structural, thermal, crystallinity property changes analyzed according treatments...

Linear Abrasive WaterJet Machining (AWJM) tests have been performed on Carbon Fiber Reinforced Plastic (CFRP) in order to a first reference of the main defects developed onto machined surface. Delamination has proved as one most critical when machining composites or layered materials. In this work defect and influence cutting parameters its formation studied. For purpose, delamination morphology characterized using Scanning Optical Microscope Electron Microscope. Additionally, study...

The novelty of EDM machining as a drilling operation for composite materials means that there is no consensus on the influence parameters optimise final quality. For these reasons, characterisation process unidirectional material has been developed. several cutting related to quality hole obtained. Thus, macrogeometric aspects in terms conicity and diameter microgeometric surface have evaluated. In addition, state wear electrode evaluated by visual inspection, allowing range offer best...

The aeronautics industry's competitiveness has led to the need increase productivity with one shot drilling (OSD) systems capable of stacks dissimilar materials (fibre/metal laminates, FML) in order reduce riveting times. Among that constitute current aeronautical models, composite and aluminium (Al) titanium (Ti) alloys stand out. These one-pass machining techniques produce high-quality holes, especially when all elements have be joined are made same material. This work followed a...

Purpose Fused filament fabrication or fused deposition modeling (FFF/FDM) has as one of its main restrictions the surface quality intrinsic to process, especially linked layer thickness used during manufacture. The purpose this paper is study possibility improving polylactic acid (PLA) parts manufactured by FFF using shot blasting technique. Design/methodology/approach influence corundum on 0.2 mm FDM PLA treated with two sizes abrasive, different exposure times and incidence pressures....

Additive Manufacturing (AM) is starting to replace conventional manufacturing processes where complex parts with small lead-time and lot sizes are needed. As test methods not suitable for AM parts, new standard specimens procedures have be defined. This work undertakes some efforts progress the design of mechanical tests. A methodology tensile tests made from one layer proposed verified on an example. It identifies challenges during Fused Layer Modeling single specimens.

Purpose This paper aims to study the interfacial and interlayer bonding of Polylactic acid parts manufactured by fused deposition modelling. Different layer thicknesses are analysed in manufacture these pieces lack material associated with this parameter is verified. The influence immersion different solvents also studied, as they increasingly used improvement surface finish. Tomography results obtained which increase density subjected treatments demonstrated. Design/methodology/approach a...

The use of adhesive layers can improve the properties and reduce defects produced in interfaces. This provides adherence to structure, adapting joining surfaces avoiding spaces between layers. However, presence potentiate caused during drilling. In turn, a loss interface occur machining affecting final structure. work has followed conventional OSD strategy CFRP UNS A92024 aluminium sheet stacking with adhesive. A series dry drilling tests have been developed different cutting conditions new...

This paper presents a preliminary study of aluminium matrix composite materials during machining, with special focus on their behavior under conventional processes. work will expand the knowledge these materials, which is considered to be strategic for some industrial sectors, such as aeronautics, electronics, and automotive sectors. Finding machining model allow us define necessary parameters when applying industry. As previous step material its an experimental state-of-the-art review has...

It is not easy to find papers that contain studies about the holes development in Ti alloys by alternative machining processes such as helical milling. The increased competitiveness and legislative requirements aeronautical sector has caused necessity develop products seeking greatest profitability sustainability, taking reference so-called four axes for manufacturing performance: economy, energy, environment functionality. This work reports on first results of a study influence cutting...

Surface modification procedures by laser techniques allow the generation of specific topographies and microstructures that enable adaptation external layers materials for applications. In texturing processes, it is possible to maintain control over microgeometry dimensions surface pattern through varying processing parameters. One main areas interest in field treatments ability generate are associated with finishes, terms roughness, can improve manufactured part’s functional capabilities....

Although its importance has increased significantly, Additive Manufacturing is not yet a fully accepted industrial manufacturing process for load-carrying parts. The future success of the group depends on standardization. This work proposes methodology design, manufacturing, and quality evaluation specimens manufactured by Fused Layer Modeling that are composed only one layer (so-called monolayers). processing properties monolayers have been studied systematically yet. A first systematic...

Reverse Engineering involves the use of techniques for extracting information about manufactured products. Assembled products contain usually hidden parts. Because this, it is difficult finding RE procedures that involve 3D-scanning techniques. However, 3D scanning technologies can help to capture their geometry generating virtual models (VM), which offer many possibilities digital analysis. On other hand, starting form a VM, possible achieve physical reproduction piece using additive...

Nowadays, improvement of the surface finish parts manufactured by fused deposition modelling is a well-studied topic. Chemical post-treatments have proven to be best technique in terms time consumption and smoothness improvement. However, these treatments modify structure material and, consequently, its mechanical properties. This relationship was studied this work. In case, on basis previous study crystallisation, polylactic acid pieces were subjected different evaluate their effects...

Helical milling has been positioned as an alternative to conventional drilling, where the advantages it offers make very attractive for use on difficult-to-machine alloys such titanium alloy UNS R56400. However, correlation between indicator of hole quality and kinematic parameters rarely studied. The kinematics are what bring most that is why necessary know their influence. In this aspect, there different focuses problems associated with complexity process kinematics, which makes undertake...

The behavior of charged bio polymer micro particles when deposited onto a CMOS chip can be analytically modeled in form the incompressible Navier-Stokes equation and electrostatic Poisson equation, as we describe this article. Based on these models, numerical simulations depositions implemented COMSOL that lead to improvements experimental setup, optimizing size charge distribution particles. Adapting experiments according simulation results, will show powerful gain deposition precision,...

Adhesion wear is the main mechanism in dry turning of aluminium alloys. This type produces an adhesion machining material on cutting tool, decreasing final surface quality parts and making it more difficult to maintain industrial tolerances. work studies influence parameters volume adhered tool for AA2024 (Al-Cu). For that purpose, a specific methodology based automatic image processing method can obtain area thickness has been designed. verified with results obtained through 3D analysis...

Abstract Nowadays, most of the studies conducted on procedures applying to materials in order increase performance thereof, has been based improvement mechanical properties, favoring its manufacturability. New techniques surface treatments by thermal processes and coatings, have managed produce microstructures whose behavior under sliding conditions allowed saving tribological limitations. This contribution aims at metrological evaluation friction wear Ti6Al4 V titanium alloys samples...

The present contribution on tool wear during the drilling of carbon fiber composite materials (CFRP)/Ti stacks intends to determine (i) if adhesion titanium carbide is mechanical or chemical, (ii) possible diffusion path, (iii) only element involved in and (iv) role CFRP this wear. overall not sum each material there a multiplicative effect between them. It has been pointed out that maximum temperature reached higher than 180 °C, 400 °C 750 respectively Ti plates alone part stack. As...

In the most of machining processes, chip morphology and microstructure contain deep information about cutting mechanisms, their evolution and, even, both process workpiece. However, usually, changes in are related only to tool surface integrity hiding relevant information. This is commonly due characterization not an easy task. effect, geometry dimensional features habitually hardly measurable evaluable. this work, a methodology for characterizing developed dry turning processes Titanium...

Surface modification of materials through thermal or chemical treatments and coatings development can be used to obtain improved behavior under abrasive adhesive wear. A great variety surface structures with different properties adapted the most demanding requirements. This is due high number parameters that controlled in each treatment, such as technique used, atmosphere, use additive elements base material, thickness modified layers, etc., In order monitoring more accurately wear...