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Добірка наукової літератури з теми "ABRASIVE MEDIA"

Автор: Grafiati

Опубліковано: 11 вересня 2023

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Статті в журналах з теми "ABRASIVE MEDIA"

Dhull, Sachin, and R. S. Walia. "Study of magnetic assisted-AFM, mechanical properties of various abrasive laden polymer media and abrasive wear and force mechanism." International Journal of Advance Research and Innovation 4, no. 1 (2016): 230–38. http://dx.doi.org/10.51976/ijari.411633.

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Abrasive flow machining (AFM), also known as extrude honing, is a method of smoothing and polishing internal surfaces and producing controlled radii. A one-way or two-way flow of an abrasive media is extruded through a work piece, smoothing and finishing rough surfaces. In one-way systems, we flow the media through the work piece, then it exits from the part. In two-way flow, two vertically opposed cylinders flow the abrasive media back and forth. In the paper, the various types of abrasive laden polymer media, their work piece applications as well as the compatibility with the abrasives used is explained. The properties of the polymer used in AFM are compared and the best combination of polymer, abrasive and hydrocarbon oil is selected. Apart from polymer properties, the media flow equations, abrasive wear and forces is also studied.

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Wang, A. Cheng, Lung Tsai, and Yan Cherng Lin. "Study the Rheological Property of Gel Abrasives in Magnetic Abrasive Finishing." Applied Mechanics and Materials 479-480 (December 2013): 86–90. http://dx.doi.org/10.4028/www.scientific.net/amm.479-480.86.

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Magnetic finishing with gel abrasive (MFGA) performs better than magnetic abrasive finishing (MAF) in terms of polishing efficiency. However, silicone gels are semi-solid polymer gels with deforming properties that are temperature dependent materials, ultimately degrading the polishing efficiency in MFGA significantly. Therefore, this study evaluated the MFGA mechanism to elucidate the properties of silicone gels in order to attain both the finished effect in MFGA and effective gel abrasives to produce a highly efficient polished surface. Cylindrical rods were polished using silicone gels with different plasticity to determine the temperature of abrasive media in the working area. Next, circulating effects of abrasive media were identified to ensure the efficiency in MFGA. Additionally, finding the relation between the concentrations of abrasive media and circulating effect in the working area. Experimental results showed that silicone gels with low plasticity produced high temperature of abrasive media in MFGA, and high temperature of abrasive medium made excellent circulating effect in the working area, inducing high material removal and fine surface roughness.

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Zulkarnain, Iskandar, Nor Adila Mohamad Kassim, M. I. Syakir, Azhar Abdul Rahman, Mohamad Shaiful Md Yusuff, Rosdin Mohd Yusop, and Ng Oon Keat. "Sustainability-Based Characteristics of Abrasives in Blasting Industry." Sustainability 13, no. 15 (July 21, 2021): 8130. http://dx.doi.org/10.3390/su13158130.

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The abrasive blasting industry is identified as the most unsafe operation in terms of potential exposure to airborne crystalline silica. This is due to the free silica content in the common abrasives that are used for blasting activities. This paper will identify a sustainability-based or green blasting media to replace free silica content abrasives for blasting activities. The characteristics of sustainability-based abrasives are determined based on systematic review procedure. The combination keywords of “Abrasive blasting”, “Garnet’’, “Free Silica Media”, “Sustainable blasting”, “Eco-friendly blasting”, “Glass Bead blasting” and “Green blasting” were used to collect the existing studies on abrasive blasting operations. Six characteristics of green abrasives were identified: (1) zero content of free silica, (2) high efficiency and productivity, (3) low consumption media (4) low amount of waste generation and emission potentials (5) high recyclability and (6) environmentally friendly in line with sustainable development goals SDG3, SDG12, SDG13, SDG14 and SDG15. The application of green abrasives as substitution to free silica media is therefore important not only for safety and health reasons, but also for the environmental protection and sustainable business operations.

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Gov, Kursad, and Omer Eyercioglu. "Effects of abrasive types on the surface integrity of abrasive-flow-machined surfaces." Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 232, no. 6 (August 3, 2016): 1044–53. http://dx.doi.org/10.1177/0954405416662080.

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In this article, the effect of abrasive types on the abrasive flow machining process was investigated. Four groups of abrasive media were prepared with different types of abrasives: SiC, AL2O3, B4C and Garnet. An experimental study was performed on DIN 1.2379 tool steel. The specimens were cut using wire electrical discharge machining and finished with the abrasive flow machining process. The results show that the white layer that formed during wire electrical discharge machining was successfully removed by abrasive flow machining in a few cycles. Although the surface roughness improves with similar trends for all media groups, the results show that the media prepared with B4C and SiC have more surface improvement than the Al2O3 and Garnet ones. The resulting average surface roughness (Ra) values are comparable to the surface quality of those obtained from lapping and super-finishing. The material removal is directly related to the hardness of the abrasive.

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Nowacka, Agnieszka, and Tomasz Klepka. "Influence of Machining Conditions on Friction in Abrasive Flow Machining Process – A Review." MATEC Web of Conferences 357 (2022): 03007. http://dx.doi.org/10.1051/matecconf/202235703007.

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Анотація:

This paper presents a rage of variable machining factors which influence substantially friction directly or by the abrasive media wear developed in the cutting zone. Abrasive flow machining is method of machining surfaces of complex holes and curved surface. In the case of traditional stream treatment methods abrasive (AFM) it is difficult to obtain a uniform roughness radial decomposition during polishing complicated openings, which results from uneven distribution of abrasive forces. The group of direct factors include the work piece materials and abrasive media, changes in the fluid pressure, number of flow cycles, the medium flow frequency. In addition, it was proposed modifications in the amount and size of grains abrasives filling the abrasive medium to increase the value of the grain pressure force on the surface to be processed and obtained an even surface of complex holes in the process AFM processing. Special attention was paid to the abrasive media wear evolution and its pronounced effect on changes of the contact conditions. The experiment results also confirm that the rise in the medium flow frequency during the process will not affect the roughness changes work piece surface.

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Mali, Harlal S., Bhargav Prajwal, Divyanshu Gupta, and Jai Kishan. "Abrasive flow finishing of FDM printed parts using a sustainable media." Rapid Prototyping Journal 24, no. 3 (April 9, 2018): 593–606. http://dx.doi.org/10.1108/rpj-10-2017-0199.

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Анотація:

Purpose The purpose of this paper is to study the integration between fused deposition modeling (FDM) technology and abrasive flow machining process to improve the surface quality of FDM printed parts. FDM process has some limitations in terms of accuracy and surface finish. Hence, post-processing operations are essential to increase the quality of the part. Design/methodology/approach Initially, a sustainable polymer abrasive gel-based media (SPAGM) using natural polymer and natural additives (waste vegetable oil) was prepared using different combinations of (abrasive mesh size, percentage of abrasives and percentage of liquid synthesizer); then the characterization of media was done to check various properties. As media is an essential part in the process which helps in increase the surface finish, it needs to have some desired characteristics such as the following: the developed SPAG needs to hold the abrasives; its viscosity has to be medium so that it can easily flow through the machine; and its thermal stability caused by the increase in the temperature during various cycles of operation. For that, it is characterized rheologically as well as thermally to find its various properties. Findings Experiments were performed on FDM-printed parts using an L9 orthogonal array with different parameters to find their effect on the workpiece. Scanning electron microscope images of SGAPM showed sharp edges of abrasive particles and bonding pattern between polymer chain molecules. Good surface finish and material removal rate (MRR) was observed at high pressure and long finishing time with 50 per cent abrasive concentration. Originality/value The authors confirm that this work is original and has neither been published elsewhere nor is it currently under consideration for publication elsewhere.

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Pikna, Ondřej, Martin Ťažký, and Rudolf Hela. "New Possibilities of Determining the Resistance of Cement Composite to Abrasion by Fast Flowing Water." Solid State Phenomena 325 (October 11, 2021): 34–39. http://dx.doi.org/10.4028/www.scientific.net/ssp.325.34.

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The current view on the determination of the abrasion resistance of a cement composite is mainly focused on the resistance of the composite to the effects of mechanical abrasion. However, many concrete structures are exposed to the abrasive effects of flowing liquids. One of the test procedures simulating this principle of abrasion is based on the creation of a very fast flow of liquids, often including abrasive media. Based on worldwide published research on the given topic, the use of the action of ultrasonic waves in a liquid, leading to the simulation of the cavitation stress of a composite, which is a very dangerous phenomenon, is considered a suitable method for creating the mentioned abrasion effects. The following article discusses new possibilities for simulating and evaluating the abrasive effects of cavitation on cement composites using the action of ultrasonic waves in a liquid. These effects will be monitored on cement pastes, which will be modified with several types of commonly used admixtures. Furthermore, the connection between the effects of the mentioned abrasive action and several physical-mechanical parameters will be monitored.

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Kalácska, Ádám, László Székely, Róbert Zsolt Keresztes, András Gábora, Tamás Mankovits, and Patrick De Baets. "Abrasive Sensitivity of Martensitic and a Multi-Phase Steels under Different Abrasive Conditions." Materials 14, no. 6 (March 10, 2021): 1343. http://dx.doi.org/10.3390/ma14061343.

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The wear behaviour of two martensitic and one multiphase steel targeted for abrasion and erosion applications in agriculture and mining industry were investigated in three abrasive test systems with different complexity. Scratch tests were performed with different indenter radii, shapes, and loads. The material behaviour was also investigated in multi-asperity contact systems. Pin-on-disc tests were performed with various loads and abrasive particles, as well as abrasive slurry-pot tests with different sliding velocities, distances, and impact angles of the abrasive media were performed. Comparing the test systems, the tested materials ranked similarly based on their wear performance, however, in each configuration, the dominant variable of the wear mechanism differed. The significance and contributions of test paramecenterters, the material’s mechanical properties (H, σM, σY, E, εεM, εεB, W, σc, Ec) and the dimensionless numbers formed from them were investigated on the wear behaviour and the surface deformation. Correlation between parameters was established by multiple linear regression models. The sensitivity of the tested materials to abrasion was evaluated taking into account the wide range of influencing parameters.

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Nowacka, Agnieszka, and Tomasz Klepka. "The application of polymers as abrasive media in abrasive flow machining." Mechanik 92, no. 4 (April 8, 2019): 234–37. http://dx.doi.org/10.17814/mechanik.2019.4.32.

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Анотація:

The characteristics of the products’ treatment by the abrasive flow machining (AFM) makes it an appropriate method of finishing the surface with complex geometry, e.g. holes or channels. Traditional methods of machining cause difficulties in obtaining a homogeneous roughness during finishing complicated shapes due to uneven distribution of abrasive forces. Due to the high price of abrasive media, not every user can afford for using it for processing. In the frame of the research, the novelty abrasive media has been developed to improve the surface roughness of the elements of polymer products. The use of viscoelastic polymers as a media of flow abrasive machining was discussed. Moreover, it is suggested to modify the quantity and size of abrasive grains filling the abrasive media in order to increase the value of the grain pressure force on the machined surface and to obtain an even surface of complex holes in AFM process.

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Kumar S, Santhosh, and Somashekhar S. Hiremath. "Temperature-dependent rheological properties of viscoelastic polymer based flexible abrasive media for finishing process." Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering 235, no. 4 (January 24, 2021): 973–85. http://dx.doi.org/10.1177/0954408920987904.

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The objective of the present investigation is to develop and study the thermal and rheological properties of the in-house developed flexible abrasive media. It is a mixer of viscoelastic polymer and plasticizer mixed with micro-abrasive particles, used for removing debris and irregularities present on internal and external complex surfaces used in the aerospace, automotive and medical industries. This paper presents, morphology of the developed abrasive media is captured using the Scanning Electron Microscope (SEM), thermal properties of the abrasive media are studied using Thermo Gravimetric Analysis (TGA) and Differential Scanning Calorimetry (DSC) analysis along with tensile properties of the abrasive media ascertained using the universal testing machine. The rheological properties of the media play a major role in media flow over the intricate shapes and removing the material from the surface. To understand the media behavior, further rheological properties such as viscosity, shear stress, storage modulus, loss modulus, loss tangent, and complex viscosity are ascertained with varying shear rate and frequency at different temperature using rheometer. The TGA and DSC results shows abrasive media has good thermal stability and possibility of using the media for finishing process under lower temperature <100 °C. Rheological studies shows the shear thinning behaviour of the media and elastic solid behavior (G′ > G′′) at different temperatures which is suitable for finishing the complex internal and the external features efficiently and effectively. The developed abrasive media is used to finish the hydraulic components which are difficult to access with conventional tools and the results of finishing process are presented.

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Більше джерел

Дисертації з теми "ABRASIVE MEDIA"

Mills, Robert Jeffrey. "Abrasive Blasting with Post-Process and In-Situ Characterization." Thesis, Virginia Tech, 2014. http://hdl.handle.net/10919/49680.

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Анотація:

Abrasive blasting is a common process for cleaning or roughening the surface of a material prior to the application of a coating. Although the process has been in practice for over 100 years, the lack of a comprehensive understanding of the complex interactions that exist with the process can still yield an inferior surface quality. Subsequently, parts can be rejected at one of many stages of the manufacturing process and/or fail unexpectedly upon deployment. The objective of this work is to evaluate the effect of selected input parameters on the characteristics of the blasted surface characteristics so that a more useful control strategy can be implemented. To characterize surface roughness, mechanical profilometry was used to collect average roughness parameter, Ra. Decreasing blast distance from 6” to 4” gave ΔRa = +0.22 µm and from 8” to 6” gave ΔRa = +0.22 µm. Increasing blast pressure from 42 psi to 60 psi decreased the Ra by 0.33 µm. Media pulsation reduced Ra by 0.56 µm and the use of new media reduced Ra by 0.47 µm. Although blasting under the same conditions and operator on different days led to ΔRa due to shorter blast times, there was no statistically significant variance in Ra attributed to blasting on different days. Conversely, a ΔRa = +0.46 µm was observed upon blasting samples with different cabinets. No significant ΔRa was found when switching between straight and Venturi nozzles or when using different operators. Furthermore, the feasibility of fiber optic sensing technologies was investigated as potential tools to provide real time feedback to the blast machine operator in terms of substrate temperature. Decreasing the blast distance from 6” to 4” led to ΔT = +9.2 °C, while decreasing the blast angle to 45° gave ΔT= -11.6 °C for 304 stainless steel substrates. Furthermore, increasing the blast pressure from 40 psi to 50 psi gave ΔT= +15.3 °C and changing from 50 psi to 60 psi gave ΔT= +9.9 °C. The blast distance change from 8” to 6” resulted in ΔT = +9.8 °C in thin stainless steel substrate temperature. The effects of substrate thickness or shape were evaluated, giving ΔT= +7.4 °C at 8” distance, ΔT= +20.2 °C at 60 psi pressure, and ΔT= -15.2 °C at 45° blasting when comparing thin stainless steel against 304 stainless steel (thick) temperatures. No significant ΔT in means was found when going from 6” to 8” distance on 304 stainless steel, 40 psi and 60 psi blasting of thin SS, as well as angled and perpendicular blasting of thin SS. Comparing thick 304 and thin stainless steel substrates at a 6” blast distance gave no significant ΔT.
Master of Science

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Pi, Vu Ngoc. "Performance enhancement of abrasive waterjet cutting /." [S.l. : s.n.], 2008. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=016765942&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.

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Hussain, Riaz. "Preparation and characterization of aryldiazonium electroreduction-derived and metallophthalocyanine-modified carbon surfaces : application to nitrate electrochemical reduction in acidic aqueous media." Thesis, Paris Est, 2012. http://www.theses.fr/2012PEST1139.

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Ce travail de thèse concerne la préparation et caractérisation des électrodes de carbone vitreuses (GC) modifiées par les films de groupements aryl (substitués) ou par phtalocyanines des métaux (MPc) et l'évaluation de leurs activités catalytiques envers la réduction électrochimique des nitrates dans les milieux aqueux acides. Les techniques adoptées pour la modification de surface du substrat (le GC) consistent à la réduction électrochimique des sels de diazonium ou à l'abrasion physique de la surface contre la poudre des MPc. En faisant intervenir un mécanisme complexe, y compris les phénomènes d'adsorption du réactif et du produit sur la surface, l’électroréduction de sels de diazonium entraîne au greffage des groupements aryls sur la surface. Les analyses voltamétriques détaillées ont rendu possible de conclure, décisivement pour la première fois, que la réduction commence à se faire sur la surface entière et, selon la concentration du diazonium et/ou l'efficacité du greffage, peut continuer à se faire à traverse les ouvertures microscopiques générés parmi les groupements aryl greffés sur la surface durant l'étape précédente de réduction (...)
This thesis work concerns about the preparation, characterization and catalytic activities evaluation of (substituted) aryl and metallophthalocyanines films-modified glassy carbon (GC) electrodes towards nitrate electrochemical reduction in acidic aqueous media. The surface modification techniques adopted consisted of the electroreduction of 4-substituted aryl diazonium salts and the metallophthalocyanine (MPc) powder abrasive adsorption. Through a complex mechanism involving the reactants and products adsorptions on the substrate surface, the electroreduction of aryl diazonium salts leads to the covalent attachment of mono as well as multilayers of aryl groups on the substrate surface. Detailed voltammetric investigations enabled to conclude, decisively for the first time, that the diazonium cation reduction begins to take place on the bulk (whole) surface and, depending upon the concentration and/or the products grafting efficiency, may continue to take place across the microscopic pinholes formed among the aryl groups grafted on the surface during the previous reduction step, thereby explaining the origin of the two reduction peaks in the voltammograms on GC surface. Electrochemical characterization of 4-nitrophenyl(NP)-modified surfaces in various types of aqueous media shed light over a number of mechanistic aspects of the process. Some new electrochemical evidences of the complications of surface coverage determination of redox centers from their electrochemical responses and of the role of aqueous electrolyte species transport on the responses have been presented. Some new phenomena or observations such as identification of the regions of votammograms corresponding to aminophenyl and hydroxyaminophenyl formation of the surface bound NP groups reduction, identification of the method of surface bound NP groups surface coverage estimation from the total width at half wave maximum (or electron transfer coefficient) of the responses, identification of the mechanistic aspects governing the differences of voltammetric behaviors of surface bound NP layers and the solution phase nitrobenzene, electrochemical (and XPS) evidences of the presence of azo type functionalities in the aryl films prepared from aryldiazonium electroreduction were also noticed. Barrier characters of the aryldiazonium electroreduction-derived N,N-dimethylaminophenyl-, nitrophenyl- and aminophenyl-modified surfaces towards ferricyanide, hexaammineruthenium and proton electroreductions in aqueous media indicate to the existence of electrostatic interactions among the surface bound and the solution phase ionic species. However, upon negative potential applications (such as those of water or nitrate reductions) surface attached films are partly or completely lost from the surface, as evidenced by the analytical scale measurements as well as from potentiostatic electrolysis of nitrate reduction in acidic aqueous media. Concerning the MPc-modified GC surfaces, the analytical scale measurements showed that among the phthalocyanines of copper, Iron and Nickel, the one of Cu is an optimizing material for the nitrate electrochemical reduction in, not previously reported, acidic aqueous media. The catalytic activity of MPc powders towards nitrate reduction in these media, which varies in the order CuPc > FePc > NiPc > GC appears to be related to the mental center and not with the phthalocyanine ring

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Hosseini, Poorya. "Exploring energy usage in comminution and media wear using steel wheel abrasion test." Thesis, McGill University, 2011. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=97206.

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Анотація:

Huge amounts of energy expended on comminution devices, such as ball mill, besides being a highly inefficient process has been the motive of much research aiming at improving the efficiency of comminution processes. Comminution theories are mainly based on size distribution of the ore and consequently fall short in addressing other imperative phenomena, such as media wear and more importantly energy utilization efficiency. A methodology based on an energy viewpoint is proposed for comminution studies which can serve as a powerful tool in design and performance optimization of comminution devices. Through this approach, the relation between operating parameters and optimization objectives which are the reduction of media wear and increase in ore breakage and energy efficiency could be explored. On the other hand, since field testing of comminution models is expensive, standard laboratory test methods which could reliably simulate the comminution conditions similar to the actual application environment are needed. While there are standard test methods for wear or breakage characterization of the materials individually, there is a need for standard test methods which enable us to conduct combined study of wear and breakage to create an environment similar to the actual applications. The Steel Wheel Abrasion Test is one of the candidates which provide us with such environment to study wear, breakage and their interrelation in one apparatus because of its high-stress nature of abrasion. Furthermore, more precise tools of describing the quantity and quality of the breakage and abrasive wear are introduced. Experimental results extracted from steel wheel abrasion test are analyzed using proposed methodologies and energy-based approach.
La faible efficacité du processus de comminution et son énorme coût énergétique ont été les raisons de nombreuses études visant à améliorer l'efficacité des processus de broyage. Les théories de la comminution sont principalement basées sur la distribution granulométrique du minerai et par conséquent ne parviennent pas à aborder d'autres phénomènes impératifs comme l'usure d'agents ou l'efficacité d'utilisation de l'énergie. Une méthodologie basée sur un point de vue énergétique est proposée pour les études de comminution, et peut servir comme outil puissant dans la conception et l'optimisation de la performance des dispositifs de comminution. Grâce à cette approche, la relation entre les paramètres de fonctionnement et les objectifs d'optimisation, qui sont de minimiser la quantité et la gravité de l'usure et d'augmenter la fragmentation du minerai et l'efficacité énergétique, pourrait être explorée. De plus, l'essai pratique des modèles de comminution est coûteux et des méthodes standards de test en laboratoire pouvant simuler de manière fiable la comminution dans des conditions similaires à l'application réelle sont nécessaires. Bien qu'il existe des expériences standardisées pour la caractérisation d'usure ou la fragmentation des matériaux individuellement, il y a un besoin de méthodes d'essai normalisées pour procéder à l'étude combinée de l'usure et de la fragmentation dans un environnement semblable à celui des applications réelles. Le test d'abrasion par roue d'acier est l'un des candidats qui peut nous fournir un tel environnement pour étudier l'usure abrasive, la fragmentation et leur interrelation dans un seul appareil. En outre, des outils plus précis pour décrire la quantité et la qualité de la fragmentation et l'usure d'abrasion sont introduits. Les résultats expérimentaux extraits de test d'abrasion par roue d'acier sont analysés en utilisant des méthodes proposées et une approche fondée sur l'énergie.

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KUMAR, VIKAS. "STUDY OF DIFFERENT TYPES OF ABRASIVE MEDIA USED IN ABRASIVE FLOW MACHINING." Thesis, 2015. http://dspace.dtu.ac.in:8080/jspui/handle/repository/16063.

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Анотація:

For products having internal inaccessible cavities or recesses, general finishing processes like lapping, honing etc. are used but they suffer from disadvantage of low quality of surface finish and that too with high equipment cost. Therefore need arises for an alternate process which has the capability of nano level finishing. Abrasive Flow machining (AFM) is such kind of fine finishing technique for these kind of products. This method has a unique property of simultaneous improvement in material removal and surface finish. It employs an abrasives laden semi-solid media, which acts as a selfdeforming cutting tool and can finish the complex cavities under a hydraulic pressure. The work piece hardness, no of cycle, volume of media, Extrusion pressure and properties of carrier media are the important process parameters that affect the performance of AFM. Abrasive flow Machining has a limitation of low material removal. So to reduce this limitation, a number of varieties of media have been used by many researchers and scholars of this field. So main aim in this report work is to study the different types of media used in this AFM process and to choose a polymer based media to cause more material removal and better surface smoothness. The five media used in this research work is Polyborosiloxane, Silicone Rubber, SBR Rubber, Nitrile Rubber and Natural Rubber, Out of which Silicone Rubber is best media.

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SINGH, HIMMAT. "OPTIMIZATION OF PROCESS PARAMETERS USING CNT PARTICLE BASED ABRASIVE MEDIA USED FOR FINISHING OF BRASS WORKPIECE BY ABRASIVE FLOW MACHINING." Thesis, 2016. http://dspace.dtu.ac.in:8080/jspui/handle/repository/14939.

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Анотація:

Abrasive flow machining is a nontraditional finishing process and is used to polish metallic components, internal inaccessible cavities or recesses using a semi liquid paste. It was developed to deburr, polish, and radius surfaces having complex geometries and edges by flowing abrasives with a viscoelastic polymer (called as media) over them. Abrasion occurs wherever the medium passes through the highly restrictive passage. In this work, two way abrasive flow machining is used to optimize the material removal and % improvement in surface roughness on brass material. In this study three parameter are used level of carbon nano tube, level of pressure, number of cycle. The abrasive media is formed with the combination of polymer and gel, abrasive particle and carbon nano tube (CNT). Polymer is made with the help of some chemical like as silicon oil , boric acid and ferric chloride (FeCl3.6H2o) and ammonia carbonates (NH4CO3). This media is mixed with the level of CNT and experiment is conducted on brass work-piece. Three process parameter level of CNT, Extrusion pressure and Number of cycle have been used for experiment to study the effect of these process parameter on % improvement in surface roughness and material removal of brass work-piece. L9 orthogonal array based on Taguchi method has been used to study the effect of various process parameter on selected on response parameter. All three parameter affects the material removal and surface finish, by using level of CNT material removal continuosly increased among other parameter while surface roughness is improved up to second level after decreases. In case of No of cycle from first level to second level material is decreased after that increased but for surface roughness improvement is little bit significant. Third parameter extrusion pressure have little bit significant on MR but highly significant for surface roughness improvement. Effect of CNT on material removal is continuosly increases. The percentage contribution of CNT is 14.98%.and the effect of other parameter on MR are percentage contribution of Extrusion pressure is 15.56% and the percentage contribution of Number of cycle is 21.22%. Optimum level is selected for material removal is C3 P1 N3. Effect of CNT on improvement on surface finish the percentage contribution of CNT is maximum is 23.84%.The percentage contribution of number of cycle is 23.14% and extrusion pressure which contribute 15.90%.

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Книги з теми "ABRASIVE MEDIA"

Rajagopal, Vathsala. The effect of chromium on the abrasive and corrosive wear of cast iron grinding media. Minneapolis, MN: University of Minnesota, 1991.

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H, Finlayson M., and United States. National Aeronautics and Space Administration., eds. Evaluation of copper slag blast media for railcar maintenance: Final report. Brigham City, Utah: Morton Thiokol, Inc., Aerospace Group, 1989.

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DataGroup, Editorial. Abrasive Media, Applications World Summary: 2020 Economic Crisis Impact on Revenues and Financials by Country. Independently Published, 2020.

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Частини книг з теми "ABRASIVE MEDIA"

Bratthäll, Johan. "Mechanical Seals for Abrasive and Clogging Media." In Fluid Sealing, 333–46. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2412-6_22.

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Soni, Ankit, Jai Kishan Sambharia, and Sandesh Trivedi. "Development of Novel Abrasive Media Using Granite Dust Powder Waste for Finishing Applications." In Advances in Manufacturing Systems, 139–56. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-4466-2_13.

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Rajesha, S., A. K. Sharma, and Pradeep Kumar. "Some Studies on Performance of a Natural Polymer Media for Abrasive Flow Machining." In Supplemental Proceedings, 333–40. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118062173.ch41.

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Rudawska, Anna, Jakub Szabelski, Magd Abdel Wahab, and Izabela Miturska. "Impact of Abrasive Blasting Media on the Strength of Steel Sheets Adhesively Bonded Joints." In Lecture Notes in Mechanical Engineering, 81–95. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-9893-7_5.

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Van Tho, Nguyen, and Elena Kolganova. "Increasing the Efficiency of Vibro-Abrasive Treatment of Transport Machine Parts by Combining Processing Media." In Fundamental and Applied Scientific Research in the Development of Agriculture in the Far East (AFE-2022), 298–306. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-36960-5_34.

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Gao, Zhiyong, and Chengwei Li. "Tuning the Morphology and Surface Property of Mineral Particles by Grinding Media." In Abrasive Technology - Characteristics and Applications. InTech, 2018. http://dx.doi.org/10.5772/intechopen.74836.

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Prater, Walter L., Garvin J. Stone, and Gwendolyn Jones Chung. "Selecting a Contamination-Free Deburring Process: Testing Abrasive Blasting Media." In Particles On Surfaces, 151–88. CRC Press, 2020. http://dx.doi.org/10.1201/9781003067429-9.

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Ansari, Irfan Ahmad, Gopal A. Gupta, Janakarajan Ramkumar, and Kamal K. Kar. "Fly ash-mixed polymeric media for abrasive flow machining process." In Handbook of Fly Ash, 681–713. Elsevier, 2022. http://dx.doi.org/10.1016/b978-0-12-817686-3.00003-7.

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Skogan, Wesley G. "Police Versus the Community?" In Stop & Frisk and the Politics of Crime in Chicago, 108–26. Oxford University PressNew York, 2023. http://dx.doi.org/10.1093/oso/9780197675052.003.0005.

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Abstract Chapter 5 turns to the police side of police–community relations. From the police point of view, the public was one of their problems. They thought their relationship with the citizenry was bad, people did not understand them or their job, and people could not be trusted. They were disdainful of two key community institutions providing public and democratic oversight of the police: the news media and political leaders. This chapter documents the importance of where they worked in shaping officers’ views of the community and their job. One was the racial composition of their beat. White, Hispanic, and African American officers alike were likely to see their views of right and wrong aligned with residents of largely White neighborhoods. Community context also affected whether officers felt acting in accordance with the principles of procedural justice could work. Again, this seemed a standard more relevant in predominately White neighborhoods. A second contextual factor was where cops were making stops. Officers working in high intensity stop & frisk beats felt overworked and more at risk—two of the banes of police work. They also perceived themselves as most estranged from the community and the least likely to have anything in common with residents. The wedge between police and the community in Chicago was largest in the places where potentially abrasive encounters between them were concentrated.

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Adhikari, Sapana P. "EENT (eye, ear, nose, throat)." In Diagnosketch, 13–20. Oxford University PressNew York, 2022. http://dx.doi.org/10.1093/med/9780197636954.003.0002.

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Abstract This chapter includes various illustrations that pertain to the EENT system (eye, ear, nose, and throat). The images depict a corneal abrasion, conjunctivitis, dental caries and dental abscess, epistaxis, sinusitis, otitis media and otitis externa, pharyngitis and peritonsillar abscess.

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Тези доповідей конференцій з теми "ABRASIVE MEDIA"

Bhagavat, Milind, Fuqian Yang, and Imin Kao. "Elasto-Plastic Finite Element Analysis of Indentations in Free Abrasive Machining." In ASME 1998 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/imece1998-1097.

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Abstract Free abrasive machining (FAM) using a wiresaw is emerging as a state of the art technology for slicing large diameter semiconductor wafers. Material removal in a FAM environment is known to be by rolling and indenting of abrasives into the cut media. Therefore, indentation by abrasives in the slurry is the single most important mechanism in wiresawing process. This paper deals with the importance of abrasive shape in material removal during FAM. To achieve this objective, indentation by conical rigid abrasives of different included angles has been investigated using finite element method (FEM). Typical indentation fracture involving median, radial and transverse cracking has been explained to the maximum level of sophistication attainable using static stress analysis. Some industrially relevant results pertaining to FAM in general and wire-sawing in particular have been proposed.

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Prakasam, Pradeep Kumar, and Sathyan Subbiah. "Analysis of 1D Abrasive Vibratory Finishing Using Acoustic Emission." In ASME 2013 International Manufacturing Science and Engineering Conference collocated with the 41st North American Manufacturing Research Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/msec2013-1210.

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Acoustic emission (AE) is a widely used non-destructive method for monitoring and control of machining processes. Vibratory finishing is a surface modification process used for polishing, deburring and finishing of components (aerospace, automotive and other industries). The polishing action takes place due to the action of abrasive particles called media on the components subjected to finishing. The media motion is complex and involves a combination of normal and oblique impacts, scratching and rolling. This work deals with the characterization of basic types of media contact occurring in the vibratory finishing process using acoustic emission signals. A novel one dimensional vibratory simulator was developed for this purpose using a tribometer setup. The one dimensional simulator was used to differentiate between the normal and scratching types of media contact and corresponding AE signals were measured. The preliminary results shows that the AE signals obtained for normal and scratching type of contacts are different. In addition to this, AE signals were used to characterize the amount of media.

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YOSHIOKA, M., S. HIRA, and H. TAKEUCHI. "MOTION OF MAGNETIC BARREL MEDIA IN ROTARY MAGNETIC FIELD." In Proceedings of the Third International Conference on Abrasive Technology (ABTEC '99). WORLD SCIENTIFIC, 1999. http://dx.doi.org/10.1142/9789812817822_0063.

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Ng, W., B. E. Puchebner, S. D. Jacobs, J. L. Currin, B. McAvoy, D. Yungk, S. M. Gracewski, and P. D. Funkenbusch. "Evaluation of Bound Abrasive Media for Fabrication of Ring Tool Polishers." In Optical Fabrication and Testing. Washington, D.C.: Optica Publishing Group, 1994. http://dx.doi.org/10.1364/oft.1994.otub5.

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The objective of this research is to develop a ring tool polisher for deterministic finishing of optical glass parts on Opticam® machining centers at the Center for Optics Manufacturing (COM). To be successful, the ring tool must reduce rms roughness from 100-200Å to 10-20Å, remove 2-4μm of residual subsurface damage, and preserve the surface figure of the glass part. The medium used to fabricate the polisher must satisfy several criteria. It must contain and be able to release polishing agent to the glass surface in an aqueous environment. It must be capable of being formed or machined into a ring (solid or segmented) with a sharp edge. It must maintain its physical integrity at high tool velocities without exhibiting catastrophic failure under load, and it must not show excessive wear during use. It must not require the assistance of additional polishing slurry. These are formidable requirements.

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Lachenmaier, Maximilian, Marius Ohlert, Daniel Trauth, and Thomas Bergs. "Analysis of the Acceleration Transfer in the Unguided Vibratory Finishing Process." In ASME 2019 14th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/msec2019-2719.

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Abstract The work bowl acceleration of a vibratory finishing machine is mainly determined by the process input variables, e. g. the mass distribution between the upper and the lower imbalance weights, the offset angle between these imbalance weights and the rotational speed of the imbalance motor. The acceleration of the work bowl has a strong effect on the acceleration of the abrasive media and workpiece within the work bowl and thus on their movement. This movement indirectly determines the contact conditions, contact forces and relative velocities, between the abrasive media and the workpiece. The contact conditions have a strong effect on the material removal rate and the surface roughness of the machined workpieces in a vibratory finishing process. Due to the fact that the contact conditions can hardly be measured during the vibratory finishing process a comprehensive understanding of the transfer behavior of the work bowl acceleration on the acceleration of the abrasive media and the workpiece and thus on the prevailing contact conditions is necessary. Therefore, this publication presents an innovative approach to identify these cause-effect relationships, in order to determine the machining intensity based on the work bowl acceleration as a function of the process input variables. Hence, new measurement systems are presented which enable the determination of the acceleration of the abrasive media and the workpiece as a function of the acceleration of the work bowl of a vibratory finishing machine for the first time. Based on these investigations it is possible to identify significant areas for the work bowl acceleration, as well as for the acceleration of the abrasive media and the workpiece and thus for the contact conditions, contact forces and relative velocities, which can be used for a targeted control of the machining intensity of vibratory finishing processes.

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Winkelmann, Lane W., Mark D. Michaud, Ray W. Snidle, and Mark P. Alanou. "Effect of Superfinishing on Scuffing Resistance." In ASME 2003 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/detc2003/ptg-48124.

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A fundamental understanding of gear scuffing has been promoted for a number of years by the use of twin disc scuffing rigs. Quantities of interest such as friction and bulk temperature are more easily and less expensively measured than performing actual gear testing. This paper discusses the scuffing test data performed on specimens superfinished using chemically accelerated vibratory finishing. One set of samples was superfinished using a high density non-abrasive ceramic media, while another set of samples was superfinished using a non-abrasive plastic media. This data is compared to other specimens with different surface finishes tested under identical conditions.

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Nagy, Douglas, and Robert Tollett. "Durable Abrasive Tip Design for Single Crystal Turbine Blades." In ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/gt2020-14449.

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Abstract In order to create and maintain peak efficiency in turbine stages, it is useful to minimize hot air leakage over blade tips. For unshrouded blades, this means creating minimal clearance over the airfoil tip with rub-tolerate zero-gap materials systems. In this study, a refractory abrasive tip material was developed and applied to a plain turbine blade tip to work in conjunction with an abradable coating on the tip-shoe. Process development efforts resulted in abrasive material that could be as much as 2mm thick. Further, the abrasive media included imbedded grits that would remain in back-up until such time as they were exposed and were pressed into service. Application methods of both furnace brazing and induction brazing were explored as were pre and post consolidation net shaping. Evaluation testing included compatibility for the application process onto single-crystal blades. Performance testing included rub-rig testing and long-term oxidation testing. Service testing included commercial engine operation for 14,000 hours followed by metallurgical re-evaluation. Service performance was mechanically successful, although some material transfer from the tip-shoe was observed which decreased the abrasive nature of the tip. Metallurgically, some intergranular oxidation was observed, but the grits themselves were well retained and were sufficiently refractory to avoid microstructural or oxidation degradation. A production implementation of the coating by an induction heating process is shown.

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Ross, Daniel, Yanming Wang, Hadyan Ramadhan, and Hitomi Yamaguchi. "Polishing Characteristics of Transparent Polycrystalline YAG Ceramics Using Magnetic Field-Assisted Finishing." In ASME 2016 11th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/msec2016-8766.

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Transparent polycrystalline yttrium aluminum garnet (YAG) ceramics have garnered an increased level of interest for high-power laser applications due to their ability to be manufactured in large sizes, and doped in relatively substantial concentrations when compared to traditional single-crystalline gain media. However, surface characteristics have a direct effect on the lasing ability of these materials, and a lack of a fundamental understanding of the polishing mechanisms of these ceramics remains a challenge for their utilization. The aim of this paper is to study the polishing characteristics of YAG ceramics using magnetic field-assisted finishing (MAF). An experimental setup was developed, through the refinement of the MAF process, for YAG ceramic workpieces. Using this equipment with diamond abrasives, the YAG ceramic surfaces were polished to sub-nanometer scale. Polishing trials with fine diamond abrasive and colloidal silica were then performed on this sub-nanometer surface and the material removal mechanisms were analyzed. Polishing with 0–0.1 μm diameter diamond abrasive caused increasing roughness with polishing time due to the continuous cycle of relatively substantial chipping followed by minor smoothing. Polishing with colloidal silica caused valleys to widen with increased polishing time and the grain structure of the ceramic influenced the material removal.

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Puerta, D., F. Anderson, and A. Geary. "The Metallographic Characterization of Thermal Spray Coating Microstructures." In ITSC2008, edited by B. R. Marple, M. M. Hyland, Y. C. Lau, C. J. Li, R. S. Lima, and G. Montavon. Verlag für Schweißen und verwandte Verfahren DVS-Verlag GmbH, 2008. http://dx.doi.org/10.31399/asm.cp.itsc2008p0791.

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Abstract Thermal spray coatings from several different coating families have been metallographically prepared using traditional and modern metallographic techniques. The different recipes used were intended to demonstrate the effect of abrasive on coating appearance. Traditional metallographic recipes, which rely heavily on the use of silicon carbide (SiC) abrasive papers, were found to produce a notably different appearance than those prepared using modern recipes. Modern recipes, which incorporate extended diamond grinding and polishing steps, were found to produce what appears to be a more representative coating structure. Other variables, including mounting media and use of vacuum impregnation, were also found to influence coating appearance.

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Zhang, Hao, Jianyan Tian, Haibin Chen, Yuhao Shi, and Shengqiang Yang. "Research on automatic construction method of interval value rules for the abrasive media based on hierarchical classification." In Third International Conference on Artificial Intelligence and Electromechanical Automation (AIEA 2022), edited by Shuangming Yang and Guanglei Wu. SPIE, 2022. http://dx.doi.org/10.1117/12.2646839.

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