![]() ![]() ![]() Laser polishing (LP) can reduce surface roughness up to 95% and increase hardness, collectively, compared to the as-built parts. LSP can control the surface regularities and local grain refinement, thus elevating the hardness value. It was found that laser shock peening (LSP) can cause severe strain rate generation, especially in thinner components. The effect of post-processing techniques on additively manufactured parts has been discussed. In this study, various post-processing techniques and their implementations have been compiled. These processes have proved their capability to enhance the surface characteristics and physical and mechanical properties. Post-processing techniques, including laser shock peening, laser polishing, conventional machining methods and thermal processes, are usually applied to resolve these issues. These problems prevent AM parts from real-time operational applications. ![]() On the other hand, AM processes face complex issues, including poor surface finish, unwanted microstructure phases, defects, wear tracks, reduced corrosion resistance and reduced fatigue life. Compared to traditional manufacturing processes, AM processes can generate parts with intricate geometries, operational flexibility and reduced manufacturing time, thus saving time and money. In addition, this article provides future perspectives on finishing processes and a view into the process selection based on the component complexity and cost.Īdditive manufacturing (AM) processes can produce three-dimensional (3D) near-net-shape parts based on computer-aided design (CAD) models. Surface integrity, for example, is controlled by experimental factors that are revealed first, followed by various researchers choosing acceptable input parameters to achieve the low surface roughness. In this review study, the mechanisms of various chemical and electrochemical based finishing processes are explained first, followed by the current state of the finishing processes of additively manufactured components. However, a lack of understanding of the fundamental mechanisms governing these finishing processes may limit their practical uses in areas like aerospace, automobiles, and defense. Chemical based finishing processes for additively manufactured parts have been developed by the researchers because it is a noncontact and automatic finishing process. As a result, the finishing processes are required for additively manufactured components to reduce the surface roughness. The surface roughness of complex cooling channels, for example, affects the formation of boundary layers, partial liquid flow, and heat transfer coefficients. The complex components manufactured by this technique have a high surface roughness, which reduces fatigue strength, influences the wear of mating components, reduces the cooling efficiency of complex cooling channels, and so on. ![]() Chemical finishing of textiles pdf free#Moreover, although most of post-processing methods are conducted using single finishing processes, AM parts can be finished with hybrid successive processes to reap the benefits of different post-processing techniques and overcome the limitation of individual process.Īdditive manufacturing is an emerging technique for manufacturing complex shapes rather than traditional manufacturing procedures due to the tool free manufacturing method. However, it was found that, in general, most mechanical abrasion processes lack the ability to finish complex parts. Among the mechanical abrasion methods, abrasive flow finishing shows optimum results in terms of its ability to finish complicated freeform cavities with improved accuracy for both polymer and metal parts. Laser finishing, on the other hand, cannot be used to finish intricate internal surfaces. It was found that chemical finishing significantly reduces surface roughness and can be used to finish parts with complicated geometry. The techniques were divided according to the materials they applied to and the material removal mechanism. The main objective was to analyze the finishing processes in terms of their ability to finish complicated surfaces and their performance were expressed as average surface roughness (Sa and Ra). Therefore, in this paper, common post-processing techniques for additive manufactured (AM) parts were examined. However, additive manufacturing comes with its inherent process characteristics of high surface roughness, which in turn effect fatigue strength as well as residual stresses. Due to these tool-free techniques, complex shape manufacturing becomes much more convenient in comparison to traditional machining. The traditional manufacturing industry has been revolutionized with the introduction of additive manufacturing which is based on layer-by-layer manufacturing. ![]()
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