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Manufacturing Processes for Small Weapon Components
Published in Jose Martin Herrera Ramirez, Luis Adrian Zuñiga Aviles, Designing Small Weapons, 2022
Jose Martin Herrera Ramirez, Luis Adrian Zuñiga Aviles
There are advanced processes that are based on nonmechanical material removal operations [11]. Some of these processes are (Figure 9.1): Water jet cutting, where a jet of water is used to cut materials.Ultrasonic machining, where material is removed from a surface by microchipping and erosion with loose, fine abrasive grains in a water slurry.Electrical discharge machining, which removes material by melting small portions of the workpart by a spark.Chemical machining, which is carried out by chemical dissolution using reagents or etchants.Electrochemical machining, where material is removed by the action of an electrical power source and ion transfer inside an electrolytic fluid.Laser beam machining, where a high-energy beam is used.Abrasive flow machining, which involves the use of abrasive grains, such as silicon carbide or diamond, that are mixed in a putty-like matrix and then forced.Abrasive jet machining, where the water jet contains abrasive particles (silicon carbide or aluminum oxide), which increase the material-removal rate above that of water jet machining.
Abrasive Flow Machining (AFM)
Published in Gary F. Benedict, Nontraditional Manufacturing Processes, 2017
Because of its low material removal rate, AFM is not suited for mass material removal. Instead, AFM is primarily used for finishing operations involving metals, ceramics, and many plastics in a uniform and economical manner. Abrasive flow machining is particularly useful when applied to workpieces containing passageways that are considered to be inaccessible with conventional deburring and polishing tools.
Modern Abrasive Processes
Published in Hassan El-Hofy, Fundamentals of Machining Processes, 2018
Abrasive flow machining (AFM) finishes surfaces and edges by extruding viscous abrasive media through or across the workpiece. Abrasion occurs only where the flow of the media is restricted. AFM is used to deburr, polish, radius, remove recast layers, and produce compressive residual stresses or provide uniform airflow or liquid flow.
Post-processing treatments to enhance additively manufactured polymeric parts: a review
Published in Virtual and Physical Prototyping, 2021
F. Tamburrino, S. Barone, A. Paoli, A. V. Razionale
Abrasive flow finishing (AFF) (also known as abrasive flow machining or abrasive blasting) is an advanced process that uses an abrasive-laden elastic medium for surface finishing, deburring, and edge contouring at the micro/nano level. AFF has similarities with mass finishing, except for the use of a flow to accelerate the wear action. Its use is quite common for metal post-processing (Mali and Manna 2009), but it has also been applied to AM polymers (Williams and Melton 1998; Mali et al. 2018). AFF operates by flowing a viscoelastic compound charged with abrasive particles and additives through a restrictive passage composed of a workpiece/tooling combination (Figure 4-a). The compound viscosity temporarily rises during this step and decreases after its passage through the restricted area. The abrasive particles act as a tool to remove peaks from the surface of the component. In (Mali et al. 2018) a sustainable polymer abrasive gel-based medium was used to finish FDM parts. In (Williams and Melton 1998) the use of AFF was investigated to finish the surfaces of SLA prototypes. The media properties play a crucial role because they should result in nonsticky, viscoelastic fluids. The number of cycles, extrusion pressure, grit composition and size, workpiece material properties, and fixture design are the parameters with the highest impact on the surface quality (Mali et al. 2018). The equipment required for this technique is more advanced and expensive than that for BF.
Abrasive flow finishing of micro-channel produced by selective laser melting
Published in Materials and Manufacturing Processes, 2023
Abrasive Flow Machining (AFM) technology as a special finishing method, in which the wall is cuffed by viscoelastic fluid abrasive.[24–26] At present, it is widely used in the hot flow path debarring polishing of mold industry, nozzles of engine industry, polishing of connecting rod and polishing of parts in textile machinery industry.[27–29] Moreover, there is no environmental pollution problem.[30–32] Basha et al.[30] reviewed the extensive work of the AFM process, and confirmed that it was suitable for polishing the components with intricate shapes. AFM possesses excellent adaptability for finishing of complicated surface and inaccessible regions of a component, such as narrow slits of component, micro-voids, cross holes, shaped holes and cavity and so on, in the meanwhile it can complete deburring and rounding. Therefore, it is more appropriate to use this technology to polish the hole wall of the flow channel of the SLM formed micro-channel heat exchanger. Bouland et al.[33] established the numerical model that used to predict the final geometry and surface roughness of components produced by SLM technology with AFM-processed. Han et al.[34] and Can Peng.[35] reported that AFM process can significantly improve surface roughness and surface drawbacks also can be removed. Nitin Dixit[36] demonstrated the influence of process parameters including layer thickness, extrusion pressure and abrasive concentration on material removed and surface roughness. They found AFM process was suitable for finishing parts fabricated by additive manufacturing. M.S. Duval-Chaneac.[37] investigated the influence of different media and AFM media parameter on the internal surface fabricated by SLM. material removal. Han et al.[38] adopted the selective laser melting (SLM) technology to fabricated seven types conformal cooling channels and investigate the surface finish after AFM. Comparing seven samples before AFM with after AFM, the internal channel surfaces roughness was improved. AFM processing technology can meet the requirements of present processing technology, especially suitable for complex curved surface shape, complex pore structure, crossing hole inner cavity and microscopic pore structure parts.