Artykuły w czasopismach: „ABRASIVE MEDIA”

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Dhull, Sachin, i 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, nr 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 i Yan Cherng Lin. "Study the Rheological Property of Gel Abrasives in Magnetic Abrasive Finishing". Applied Mechanics and Materials 479-480 (grudzień 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 i Ng Oon Keat. "Sustainability-Based Characteristics of Abrasives in Blasting Industry". Sustainability 13, nr 15 (21.07.2021): 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, i 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, nr 6 (3.08.2016): 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, i 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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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 i Jai Kishan. "Abrasive flow finishing of FDM printed parts using a sustainable media". Rapid Prototyping Journal 24, nr 3 (9.04.2018): 593–606. http://dx.doi.org/10.1108/rpj-10-2017-0199.

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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 i Rudolf Hela. "New Possibilities of Determining the Resistance of Cement Composite to Abrasion by Fast Flowing Water". Solid State Phenomena 325 (11.10.2021): 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 i Patrick De Baets. "Abrasive Sensitivity of Martensitic and a Multi-Phase Steels under Different Abrasive Conditions". Materials 14, nr 6 (10.03.2021): 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, i Tomasz Klepka. "The application of polymers as abrasive media in abrasive flow machining". Mechanik 92, nr 4 (8.04.2019): 234–37. http://dx.doi.org/10.17814/mechanik.2019.4.32.

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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, i 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, nr 4 (24.01.2021): 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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Malkorra, Irati, Hanène Souli, Ferdinando Salvatore, Pedro Arrazola, Joel Rech, Mehmet Cici, Aude Mathis i Jason Rolet. "Modeling of Drag Finishing—Influence of Abrasive Media Shape". Journal of Manufacturing and Materials Processing 5, nr 2 (26.04.2021): 41. http://dx.doi.org/10.3390/jmmp5020041.

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Drag finishing is a widely used superfinishing technique in the industry to polish parts under the action of abrasive media combined with an active surrounding liquid. However, the understanding of this process is not complete. It is known that pyramidal abrasive media are more prone to rapidly improving the surface roughness compared to spherical ones. Thus, this paper aims to model how the shape of abrasive media (spherical vs. pyramidal) influences the material removal mechanisms at the interface. An Arbitrary Lagrangian–Eulerian model of drag finishing is proposed with the purpose of estimating the mechanical loadings (normal stress, shear stress) induced by both abrasive media at the interface. The rheological behavior of both abrasive slurries (media and liquid) has been characterized by means of a Casagrande direct shear test. In parallel, experimental drag finishing tests were carried out with both media to quantify the drag forces. The correlation between the numerical and experimental drag forces highlights that the abrasive media with a pyramidal shape exhibits a higher shear resistance, and this is responsible for inducing higher mechanical loadings on the surfaces and, through this, for a faster decrease of the surface roughness.

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Kumar, Sonu, Q. Murtaza, R. S. Walia, S. Dhull i P. K. Tyagi. "Synthesis CNTs Particle Based Abrasive Media for Abrasive Flow Machining Process". IOP Conference Series: Materials Science and Engineering 115 (luty 2016): 012034. http://dx.doi.org/10.1088/1757-899x/115/1/012034.

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Daum, D., i P. B�low. "Ball cocks for liquid abrasive media". Chemical and Petroleum Engineering 27, nr 6 (czerwiec 1991): 302–4. http://dx.doi.org/10.1007/bf01235646.

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Fong, Weng Seng, Yee Ming Wan i David Lee Butler. "Development of Media for Low Pressure Abrasive Flow Machining". Advanced Materials Research 126-128 (sierpień 2010): 148–53. http://dx.doi.org/10.4028/www.scientific.net/amr.126-128.148.

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Abrasive flow machining (AFM) has become one of the more attractive finishing processes used in applications such as deburring, recast layer removal, radiusing as well as for polishing. Recently, there has been renewed interest in developing low cost/ low pressure modular AFM systems and media. The media which contains the abrasive particles is the key element in ensuring efficient material removal and a good surface finish. In this paper, the authors will present their work on the development and characterization of a new abrasive media formulation.

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Bremerstein, Tina, Annegret Potthoff, Alexander Michaelis, Christian Schmiedel, Eckart Uhlmann, Bernhard Blug i Tobias Amann. "Wear of abrasive media and its effect on abrasive flow machining results". Wear 342-343 (listopad 2015): 44–51. http://dx.doi.org/10.1016/j.wear.2015.08.013.

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Fu, Youzhi, Hang Gao, Qiusheng Yan, Xuanping Wang i Xu Wang. "Rheological characterisation of abrasive media and finishing behaviours in abrasive flow machining". International Journal of Advanced Manufacturing Technology 107, nr 7-8 (kwiecień 2020): 3569–80. http://dx.doi.org/10.1007/s00170-020-05288-9.

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Mangesh, Gharat Saurabh, i Aviral Misra. "Finite element analysis of viscoelastic media used in abrasive flow machining process". IOP Conference Series: Materials Science and Engineering 1248, nr 1 (1.07.2022): 012005. http://dx.doi.org/10.1088/1757-899x/1248/1/012005.

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Abstract The surface roughness of a part is the most important parameter in view of tribological applications and it also affects the working life of the part during application. The abrasive flow machining (AFM) process is an advanced non-conventional finishing process, used to deburr, polish, and to remove the recast layer from the surface as well as at the edges of the components. In AFM viscoelastic media is used to finish the workpiece with close dimensional tolerance and precision. The viscoelastic media used in the AFM process is laden with abrasive particles. In the present work, a finite element analysis of viscoelastic abrasive media is performed considering the AFM process. A mixture of polyborosiloxane and silicon carbide is used as viscoelastic abrasive media and the AFM process is modeled using ANSYS Polyflow. In the analysis, the flow of viscoelastic abrasive media is assumed to follow the Maxwell model of viscoelastic fluid. The simulations were performed for varying the extrusion pressure for the finishing of an internal cylindrical surface. The results of the simulations were validated with the experimental observation and found in good agreement.

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Muhandes, Hasan, Ádám Kalácska, László Székely, Róbert Keresztes i Gábor Kalácska. "Abrasive Sensitivity of Engineering Polymers and a Bio-Composite under Different Abrasive Conditions". Materials 13, nr 22 (19.11.2020): 5239. http://dx.doi.org/10.3390/ma13225239.

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Two different test systems were designed to evaluate the tribological behavior of five engineering plastics (Polyamide—PA grades and Ultra High Molecular Weight Polyethylene—UHMW-PE) and a fully degradable bio-composite (Polylactic Acid—PLA/hemp fibers) targeted to agricultural machinery abrasive conditions. Pin-on-plate tests were performed with different loads, sliding velocity and abrasive particles. The material response was further investigated in a slurry containing abrasive test system with different sliding velocities and distances, abrasive media compositions and impact angles. The abrasive wear, the change of the 3D surface roughness parameters, the friction force and contact temperature evolution were also analyzed as a function of the materials’ mechanical properties (H,E,σy,σc,εB,σF,σM) and the dimensionless numbers derived from them. Using the IBM SPSS 25 software, multiple linear regression models were used to statistically evaluate the measured data and to examine the sensitivity of the material properties and test system characteristics on the tribological behavior. For both test setups, the system and material characteristics influencing the dependent variables (wear, friction, heat generation) and the dimensionless numbers formed from the material properties were ranked using standardized regression coefficients derived from the regression models. The abrasion sensitivity of the tested materials were evaluated taking into account a wide range of influencing parameters.

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Scriabin, Vladimir, i Nikita Aniskin. "PECULIARITIES OF TURNING MACHINING WITH STATICALLY COMPACTED ABRASIVE MEDIA". Transport engineering 2022, nr 11 (10.11.2022): 52–63. http://dx.doi.org/10.30987/2782-5957-2022-11-52-63.

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The study objective is to find out an analytical dependence that correlates the operating parameters and the conditions of the finishing abrasive treatment with the roughness of the working surfaces of the parts, taking into account the shape factor of the manufactured parts. The tasks to which the paper is devoted include theoretical and experimental studies of the effect of the treated surface roughness on the technological modes and conditions of surface treatment of complex-profile parts in the medium of statically compacted loose abrasive, as well as in the development of a methodology for determining rational modes and conditions taking into account the shape factor of the machined parts and determining the achievable range of surface roughness. Research methods: theoretical studies are conducted on the basis of the main provisions of mechanical engineering technology, grinding theory, theoretical mechanics, theory of elasticity and plasticity. Experimental studies are carried out according to standard methods in production and laboratory conditions using certified instrumentation. The data obtained are processed using computer technology and presented in the form of empirical dependencies, convenient for practical use. The novelty of the work is in finding mathematical dependencies for calculating the pressure of a statically compacted abrasive layer on the surface of the parts being machined, taking into account the shape factor. Conclusions: Based on the calculated theoretical dependencies and experimental studies, it is shown that the work of micro-cutting with the microrelief of abrasive grains is approximately 1.5...2 times higher than the work of micro-cutting with the tops of abrasive grains of the grinding wheel. This allows to conclude that the machining of parts with a statically compacted loose abrasive, compared with grinding with a conventional grinding wheel, is a less energy-consuming process of removing material from the surfaces of the machined parts. The paper presents peculiarities of finishing parts with statically compacted abrasive media. The ratio of friction work and micro-cutting of the machining is shown. The nature of the contact interaction of abrasive grains with the treated surface is considered for the first time, taking into account the shape factor, and the rational range of final roughness is defined. The role of cutting elements of particles affecting the quality and productivity of machining is determined.

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Liu, Wenwu, Shuwen Wang, Qifeng Jiang, Michael Morgan i Xiaoxiao Liu. "Study on the Motion Characteristics of Abrasive Media in Vibratory Finishing". Journal of Physics: Conference Series 2198, nr 1 (1.05.2022): 012035. http://dx.doi.org/10.1088/1742-6596/2198/1/012035.

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Abstract In order to investigate the motion characteristics of the abrasive media in the vibratory finishing, the RecurDyn and EDEM coupled simulation method is employed. The simulation results show that the trajectories of the abrasive media are annular spiral motions in general, including a circular motion about the central axis of the vibratory finishing machine and an elliptical motion around the center of the media flow. The reliability of the RecurDyn-EDEM coupled simulation for the vibratory surface finishing process is validated by X-ray real-time detection, which has significance in better understanding of the motion characteristics of abrasive media and the optimal design of the vibratory surface finishing processes.

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Yildirim, K., i Leonard G. Austin. "The abrasive wear of cylindrical grinding media". Wear 218, nr 1 (czerwiec 1998): 15–20. http://dx.doi.org/10.1016/s0043-1648(98)00198-7.

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Patil, Vijay B., Amol S. Bhanage i Rajat S. Patil. "Analysis and Optimization of Process Parameters of Abrasive Flow Machining Process for Super Finishing of Non-Ferrous Material Nozzle". Applied Mechanics and Materials 612 (sierpień 2014): 97–104. http://dx.doi.org/10.4028/www.scientific.net/amm.612.97.

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This paper deals with the improving lay of finish and the superfinishing of the nozzles which is used in plasma cutting operation. This is basically alternative solution to present finish obtained by turning, drilling and reaming of the profiled bores and orifices. The advance micromachining process were developed, known as Abrasive Flow Machining (AFM) which is capable to altering the orifice (nozzle of plasma cutting machines) so that present process is to be improved without altering the geometry of the component. The effects of different process parameters such as number of cycles, concentration of abrasive, abrasive mesh size and media flow speed, surface finish are studied here. The design of the experiments 16(24) provides two levels for each variable. These levels are taken into consideration for finding out the effect of variation of parameters on the surface roughness of the copper orifice. The objective of paper is to learn how each parameter is considered for Abrasive Flow Machining such as: abrasive concentration in media, number of cycles, abrasive mesh size and media flow speed affects the surface roughness of copper orifice also to find out the mathematical relationship between surface roughness value and process parameters. Analysis of Variance (ANOVA) for the experimental data has been carried out and optimizations of abrasive flow machining process parameters were done. Also Analytic Hierarchy Process (AHP) done here for selecting hierarchy process parameter .Capabilities of the machine ultimately improved with the new technology developed.

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Kumar, Prakasam Pradeep, i Subbiah Sathyan. "Simulation of 1D Abrasive Vibratory Finishing Process". Advanced Materials Research 565 (wrzesień 2012): 290–95. http://dx.doi.org/10.4028/www.scientific.net/amr.565.290.

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The vibratory finishing process involves three dimensional motion of abrasive media interacting with part surfaces. With the ultimate goal of simulating such media motion in laboratory conditions, we present here a first step that makes use of a tribometer’s recipricating drive to provide one dimensional controlled vibrations. Finishing experiments using this setup are conducted using abrasive media and titanium alloy work material, both of the type typically used in aerospace industry. Material removal rates, surface roughness and contact forces are measured in two different setups. The media motion is also modelled using multi-body dynamics to predict the contact forces between the media and the work surface. Experimental results are seen to follow literature reported and model predicted trends. This work paves the way for a true three dimensional simulator for a vibratory finishing process.

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Webster, Matthew T., i Raymond C. Loehr. "Recycling of Spent Abrasive Media in Nonstructural Concrete". Journal of Environmental Engineering 122, nr 9 (wrzesień 1996): 840–49. http://dx.doi.org/10.1061/(asce)0733-9372(1996)122:9(840).

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Chan, Jason, i Philip Koshy. "Tool edge honing using shear jamming abrasive media". CIRP Annals 69, nr 1 (2020): 289–92. http://dx.doi.org/10.1016/j.cirp.2020.04.097.

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Mali, Harlal Singh, i Alakesh Manna. "Experimental Investigation during Finishing of Al/SiC-MMC's by Abrasive Flow Machining (AFM) Process". Advanced Materials Research 264-265 (czerwiec 2011): 1130–36. http://dx.doi.org/10.4028/www.scientific.net/amr.264-265.1130.

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Al/SiCp-MMC’s find their use in engineering and structural components but their machining particularly finishing is a challenge for manufacturing engineers due to their heterogonous nature having abrasive particles randomly distributed and oriented in the matrix material. An abrasive flow machining (AFM) set up has been designed and fabricated with an indigenously developed alternative media to finish the internal cylindrical surfaces of Al/SiCp- MMC components. Work-pieces were prepared by lathe operations after stir casting Al/SiC-MMC, 25 mm diameter bar of 0%, 5%, 10% and 15% SiC by weight. The influence of AFM process parameters e.g. abrasive mesh size, number of cycles, extrusion pressure, abrasive concentration and AFM media viscosity grade on average surface finish improvement, Ra and material removal, MR, mg have been analyzed. The Scanning Electron Microscopy (SEM) study also reveals the improvement in surface finish of these MMC’s.

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Cheng, Kai, Yizhi Shao, Mitul Jadva i Rodrigo Bodenhorst. "Development of the improved Preston equation for abrasive flow machining of aerofoil structures and components". Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 233, nr 9 (12.12.2018): 1397–404. http://dx.doi.org/10.1177/1350650118817694.

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The paper presents an improved Preston equation, which aims to be part of the industrial application to abrasive flow machining. The equation will aid the engineers to optimise the process for desired surface roughness and edge tolerance characteristics on complex geometries in an intuitive and scientific manner. The methodology presented to derive the equation underpins the fundamental cutting mechanics of abrasive machining or polishing assuming all abrasive particles within the media are spherical as manufacturers defined. Further to derivation, full four factorial experimental trials and computational fluid dynamics simulation are implemented to generate the flow features of media on coupon to evaluate and validate the equation for its competency and accuracy on prediction of material removal. The modified Preston equation can significantly contribute to optimise the abrasive flow machining process, and will advantage the integrated machine design to predict better virtual surface roughness and material removal rates.

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Hashimoto, Yohei, Yugo Nakayama, Tatsuaki Furumoto, Akihito Sekiya, Tetsuya Yamada, Tatsuki Kawahara i Akira Hosokawa. "Finishing Speed Improvement Using Side Cover Plates in Gyro Finishing". International Journal of Automation Technology 17, nr 1 (5.01.2023): 47–54. http://dx.doi.org/10.20965/ijat.2023.p0047.

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Gyro finishing is a mass-finishing process in which fixed workpieces are finished by contact with the flow of abrasive media owing to the rotation of the barrel. The process is used to finish large complex-shaped workpieces, such as large gears and parts constructed using additive manufacturing. In our previous study, we proposed a cover plate positioned above a workpiece to restrict the upward motion of abrasive media after contact with the workpiece, thereby improving the finishing speed. In this study, plates were added at the side of the workpiece to restrict the flow of the abrasive media toward the side of the workpiece and further improve the finishing speed. First, we evaluated the effect of the side plates using a simple-shaped workpiece. The difference in the surface roughness during a 5 min process was evaluated under certain conditions of the side cover plates. We confirmed that the finishing speed can be increased by using a side cover plate whose front was positioned behind the workpiece center because of the restriction of motion of the abrasive media. In contrast, the finishing speed decreased when a side cover plate whose front was positioned in front of the workpiece center was used because of the interruption in the transmission of force from the barrel wall to the abrasive media near the workpiece, owing to the side cover plates. Subsequently, the effect of the side cover plates placed at a suitable position was evaluated based on variations in the surface roughness during the process. We confirmed that the finishing speed increased by approximately a factor of 1.5 when the side cover plates were used owing to restrictions in the motion of the abrasive media. Finally, a spur gear was finished with cover plates, as a sample of practical workpieces. The finishing speed was determined based on the difference in the surface roughness of the gear teeth during the process. The finishing speed increased when a side cover plate whose front was positioned behind the workpiece center was used. Therefore, it can be concluded that the use of side cover plates is an effective technique to improve the finishing speed in gyro finishing.

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Dong, Zhiguo, Gang Ya i Jiancheng Liu. "Study on machining mechanism of high viscoelastic abrasive flow machining for surface finishing". Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 231, nr 4 (2.10.2016): 608–17. http://dx.doi.org/10.1177/0954405415586967.

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Abrasive flow machining is a pragmatic machining process used for part finishing. This article primarily focuses on the study of machining mechanism of high viscoelastic abrasive flow machining, with the aim to understand the relation among the abrasive media’s flow pressure, the material removal rate and the machining quality. The theoretical calculation models of the normal pressure on the inner surface of a circular tube and the wall sliding velocity are established based on rheology theory. The material removal rate of abrasive flow machining with a high viscoelastic abrasive media is derived. Numerical simulations with various machining conditions were conducted using the mathematical models proposed in this research and the obtained findings are discussed. The feasibility of these models introduced for high viscoelastic abrasive machining is also investigated and verified through actual experimental tests.

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Sushil, Mittal, Kumar Vinod i Kumar Harmesh. "Multi-objective optimization of process parameters involved in micro-finishing of Al/SiC MMCs by abrasive flow machining process". Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 232, nr 4 (13.01.2016): 319–32. http://dx.doi.org/10.1177/1464420715627292.

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It is hard to finish small slots in composite materials which have wide applications nowadays in aerospace, automobile and medical. Abrasive flow machining is a process that is suitable for such type of operations. In this paper, by using abrasive flow machining, investigation of SiC Metal Matrix Composites (MMCs) with aluminum as base material has been done. Material removal rate and change in surface roughness (ΔRa) are taken as response parameters. Response surface methodology has been applied to find out the effect of input parameters like fluid pressure, percentage of oil in media, grit size, concentration of abrasives, workpiece material and number of cycles on response parameters. Box–Behnken design has been preferred. Response parameters have been optimized using the desirability approach in response surface methodology. The significance of different parameters is identified using analysis of variance. An optimum combination of parameters is designed for the process. Furthermore, specimens were examined and analyzed using scanning electron microscope and X-ray diffraction techniques.

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Wang, Xuan Ping, You Zhi Fu i Hang Gao. "Study on Effect of Viscoelastic Properties on Surface Roughness Uniformity in Abrasive Flow Machining for Plate Surface". Advanced Materials Research 1136 (styczeń 2016): 131–34. http://dx.doi.org/10.4028/www.scientific.net/amr.1136.131.

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Abrasive flow machining is a suitable technique for surface polishing due to its rheological characteristics, however, it's difficult to achieve uniform roughness for polished surfaces as the material removal mechanism is still ambiguous. In this paper the viscoelastic properties of abrasive flow media are incorporated to explore the phenomena of inconsistent material removal in the AFM polishing process, where the material removal near the edges is obviously higher than that in the middle along the flow direction. The rheological parameters of the viscoelastic constitutive model adopted are varied to study the polishing effectiveness under different process conditions. The results of numerical analysis reveal that there exist distinct differences of viscoelastic stress fields between the edges and the middle regions, which leads to the material removal near the edges is higher than that in the middle. It could be concluded that the viscoelastic properties of abrasive media play the dominant role for the inconsistent material removal in abrasive flow machining process.

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Bodnárová, Lenka, Martin Ťažký, Lucia Ťažká, Rudolf Hela, Ondřej Pikna i Libor Sitek. "Abrasive Wear Resistance of Concrete in Connection with the Use of Crushed and Mined Aggregate, Active and Non-Active Mineral Additives, and the Use of Fibers in Concrete". Sustainability 12, nr 23 (27.11.2020): 9920. http://dx.doi.org/10.3390/su12239920.

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Virtually every concrete structure comes into contact with abrasive effects of flowing media or solids, which have a direct impact on the durability of concrete. An abrasive effect is most pronounced in transport or water management structures, and these structures are often designed for a significantly longer service life (usually 100 years). This research evaluates the influence of the filler component in terms of the type of aggregate and its mineralogical composition on concrete abrasion resistance. As part of the impact of the binder component, several concrete mixtures were produced using the same aggregate and maintaining the same strength class with the addition of different types of active and inert mineral additives. In other parts of the research, the effect of adding fiber reinforcement on the abrasion resistance of concrete was verified. Mutual connections and correlations in different age groups (7, 28 and 90 days) were sought for all obtained results. The abrasion resistance of the composite was monitored by using standard procedures, especially using a Böhm device. It was found that for good abrasion resistance of concrete, it is not necessary to produce concretes with high strength classes using often expensive mineral additives (microsilica) and quality aggregates, but the maturation time of the composite and its microstructure plays an important role.

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Zhuk, Yuri. "Nano-Structured Tungsten Carbide Coating Reduces Wear of Tooling for Extrusion and Abrasive Materials Forming". Key Engineering Materials 651-653 (lipiec 2015): 467–72. http://dx.doi.org/10.4028/www.scientific.net/kem.651-653.467.

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This paper presents the applications of advanced CVD Tungsten Carbide coating to extend the life of tooling used for forming abrasive and corrosive materials.Hardide nanostructured Tungsten Carbide coating combines high hardness (70-77Rc) with excellent toughness. Unlike other hard coatings Hardide can produce a conformal coating layer on complex-shaped tools, including internal surfaces of extrusion die cavities and moulds. In ASTM G65 test the Hardide coating abrasion resistance exceeded WC/Co (9%) cemented carbide by a factor of 4X, and D2 tool steel by 10X. Thus the coating can significantly increase the life of D2 steel tooling used for forming abrasive materials and by maintaining better dimensional tolerances and surface finish of the tool it will manufacture better quality products.The Hardide coating has enhanced resistance to corrosion and aggressive media, including acids; this makes the coating especially suitable for the tooling used in forming uPVC, PTFE and other corrosive materials.The Hardide coating has been tested on extrusion and pelletizing dies processing abrasive and corrosive slurries and typically showed a 3X increase in the life of the tooling. Similar results were achieved by the coating of powder compaction punch/die sets for pharmaceuticals tableting.

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Jayasimha, S. L. N., N. L. Murali Krishna i H. P. Raju. "Assessment of Surface Quality in Extrusion Honing Process Using Dimensional Analysis Approach". Asian Journal of Engineering and Applied Technology 11, nr 2 (10.11.2022): 11–18. http://dx.doi.org/10.51983/ajeat-2022.11.2.3369.

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It is critical to obtain the desired surface quality on the internal and external portions of machined part. The estimated level of surface texture can be induced on the exterior regions using traditional finishing processes such as grinding, honing, and so on. While the problem emerges when processing core miniature components such as micro bores, inlet/outlet valves etc. The EH process overcomes this limitation of conventional finishing method. It is a novel micro machining process that extrudes the pressured flow of carrier media blended with abrasives into the confined passage to generate desired level of surface texture. Owing to abrasion process micro machining occurs by taking away the negligible amount of stock material. The present study focuses on the impact of number of passes at the specimen’s entry and exit sides of the carrier media. The improvements in surface finish (Ra) on both side i.e., entry and exit are evaluated as well. A dimensionless expression for Ra is also developed. The relationship is implemented using Buckingham’s π theorem and comparison of developed model is performed with experimental results. SEM analysis is made to portray surface texture produced by selected process parameters such as number of passes, volume fraction and grit size of abrasive grains.

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Hull, J. B., D. O'Sullivan, A. J. Fletcher, S. A. Trengove i J. Mackie. "Rheology of Carrier Media Used in Abrasive Flow Machining". Key Engineering Materials 72-74 (styczeń 1992): 617–26. http://dx.doi.org/10.4028/www.scientific.net/kem.72-74.617.

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Davidson, David A. "Green mass finishing with dry abrasive and polishing media". Metal Finishing 105, nr 5 (maj 2007): 45–48. http://dx.doi.org/10.1016/s0026-0576(07)80551-4.

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Osipov, Alexey Alexandrovich, i Alexander Petrovich Osipov. "The study of spindle finishing with sand abrasive media". Materials Today: Proceedings 19 (2019): 2518–21. http://dx.doi.org/10.1016/j.matpr.2019.08.173.

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Agrawal, A., V. K. Jain i K. Muralidhar. "Experimental determination of viscosity of abrasive flow machining media". International Journal of Manufacturing Technology and Management 7, nr 2/3/4 (2005): 142. http://dx.doi.org/10.1504/ijmtm.2005.006828.

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Dixit, Nitin, Varun Sharma i Pradeep Kumar. "Development and characterization of xanthan gum-based abrasive media and performance analysis using abrasive flow machining". Journal of Manufacturing Processes 67 (lipiec 2021): 101–15. http://dx.doi.org/10.1016/j.jmapro.2021.04.053.

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Stańczyk, Marcin, i Tomasz Figlus. "The Effect of Selected Parameters of Vibro-Abrasive Processing on the Surface Quality of Products Made of 6082 Aluminium Alloy". Materials 12, nr 24 (9.12.2019): 4117. http://dx.doi.org/10.3390/ma12244117.

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Vibro-abrasive processing is the basic method for the mass finishing of parts and components in various industries. Continuous progress in the development of processing media and machine design solutions means that every research effort into vibro-abrasive processing broadens the scope of knowledge in the selection of media, parameters, and applications in various industry fields. In this paper, an attempt is made to parametrize the vibratory grinding process, which is one of the three stages of high gloss finishing. Samples of the 6082 aluminium alloy intended for use in loaded machine parts and forged car wheel rims were subject to a research analysis. The samples were processed in a rotary vibrator equipped with a sample fixing system, using resin media and auxiliary com-pounds. On the basis of the analysis, the processing capacities were determined for the selected conditions and abrasive media. The influence of time and applied processing media on the change in samples’ roughness was determined. The effects of processing were examined with the use of laser devices measuring surface roughness in the areas of 3D and 2D analysis. The analysis of the test results showed that the use of S12TZ type resin media in a 12-hour finishing process of the 6082 aluminium alloy allowed for a 75.5% reduction in surface roughness, which corresponds to approximately 6.3% per hour of processing.

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Zhang, Ke Hua, Jin Fu Ding i Yong Chao Xu. "Research on Process Parameters Influencing on Cutting Force in Abrasive Flow Machining (AFM)". Advanced Materials Research 797 (wrzesień 2013): 390–95. http://dx.doi.org/10.4028/www.scientific.net/amr.797.390.

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In order to reduce the cost, improve the surface of workpiece machined by AFM and make out reasonable technological parameters of AFM, AFM theory model has been developed in the present work. The process parameters such as pressure, piston velocity, temperature and viscosity impacting on the workpiece surface quality have been researched. Firstly, the properties parameters of abrasive media such as viscous have been figured out with formulas based on the characters of abrasive media. And then the force between abrasive near to the workpiece surface and workpiece has been modeled with fluidics equations and dynamics equations. However, different parameter value leads to different force and different force has different surface quality (Ra) of workpiece. The calculation result is similar to the experiment result to some extent. Obviously, this model is helpful to establish the reasonable process parameters.

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42

Reddy, Y. Rameswara. "Response Optimization of Machining Parameters using MCDA-Vikor Method for Acrylic Glass with AHAJM". International Journal for Research in Applied Science and Engineering Technology 11, nr 7 (31.07.2023): 217–25. http://dx.doi.org/10.22214/ijraset.2023.54596.

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Abstract: Abrasive Hot Air Jet Machining (AHJM) is becoming one of the most prominent machining techniques forPolymethyl Methacrylate (PMMA) and other brittle materials. In this attempt has been made to combine abrasive and hot air to form an abrasive hot air jet. Abrasive hot air jet machining can be connected to different tasks, for example, boring, surface scratching, scoring and small scale completing on the glass and its composites. The impact of air temperature onthe material expulsion rate connected to the procedure of glass carving and scoring is talked about in this article. The unpleasantness of the machined surface is additionally investigated. It is discovered that the material removal rate (MRR) increments as the temperature of transporter media (air) is expanded. In the present work to be attempt to investigate machining characteristics of PMMA material on hot air abrasive jet machining. In hot air abrasive jet machining(HAJM) abrasive particles stay on abrasive particle stay molten by compacted air in a closed chamber and are intensive over the objective surface over a nozzle the stream of particles coming out of the nozzle through very high velocity’s (175-300m/s) impacts the objective surface and eliminates the material by destruction. The investigation has to be carried on to study the effect of process parameters as material removal rate(MRR) as surface roughness(SR) with different input parameters like Air Pressure, , Size Of Abrasives , Stand-Off Distance ,Temperature Of Carrier Gas. In this experimental process Tungstencarbide coated nozzles were to be used flow of silicon carbide(sic) particles will be used.The Poly(methyl methacrylate) (PMMA), furthermore saw as acrylic glass, acrylic material, or plexiglass as suitably as by using the change names Plexiglas, Crylux, Lucite, Acrylate. PMMA it is an unquestionable thermoplastic .the creation formula of PMMA is (C5O2H8)n it has incredible properties to, for instance, lightweight, 92% Transparent observable light effect inside 3mm of thick material, extraordinary solidarity to consider another polystyrene. it's for the most part important in these zones, for instance, Because of its direct properties, lightweight and preferable quality took a gander at over glass, It was broadly usedto make aircraft windshields, shades and weapon turrets. After this couple of different business applications were made for PMMA, for instance, glass material, façade arrangement, publicizing, vehicle headlamps, etc.,

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Tęcza, Grzegorz. "Changes in Abrasion Resistance of Cast Cr-Ni Steel as a Result of the Formation of Niobium Carbides in Alloy Matrix". Materials 16, nr 4 (19.02.2023): 1726. http://dx.doi.org/10.3390/ma16041726.

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Cast austenitic chromium-nickel steel is commonly used for the manufacture of machine parts and components, which are exposed to the attack of corrosive media and abrasive wear during operation. The most commonly used grades include GX2CrNi18-9 and X10CrNi18-8 as well as GX2CrNiMo17-12-2 and X6CrNiMoNb17-12-2. To improve the abrasion resistance of cast chromium-nickel steel, primary niobium carbides were produced in the metallurgical process by increasing the carbon content and adding Fe-Nb. The microstructure of the obtained test castings consisted of an austenitic matrix and primary niobium carbides evenly distributed in this matrix. The measured hardness of the samples after heat treatment ranged from 215 to 240 HV and was higher by about 60 units than the hardness of the reference cast GX10CrNi18-9 steel, which had a hardness of about 180 HV. Compared to the reference cast steel, the abrasive wear resistance of the tested cast chromium-nickel steel (measured in Miller test) with contents of 4.4 and 5.4 wt% Nb increased only slightly, i.e., by 5% for the lower niobium content and 11% for the higher niobium content. Compared to ordinary cast GX10CrNi18-9 steel, the addition of 9.2 wt% Nb reduced the abrasive wear by almost 2.5 times.

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Sato, Takashi, Edwin Soh, Yuuichiro Nakayama, Miki Shinagawa i Yasuhiko Fukuchi. "Effect of Media Degradation on Finishing Characteristics in Abrasive Flow Machining". Materials Science Forum 874 (październik 2016): 127–32. http://dx.doi.org/10.4028/www.scientific.net/msf.874.127.

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Abrasive flow machining (AFM) is one of the most promising technologies for internal finishing and de-burring for features with complex geometry. This study investigates the effect of media degradation on finishing characteristics achieved using the AFM process. A total of 50 experiments, using Inconel 718 cylindrical coupons machined by Wire-Electron Discharge Machining (WEDM), were conducted employing the same process conditions while using a single batch of AFM media. Experimental results indicate that media degradation has minor influence on surface roughness, but more significant influence on material removal and media flow rate. Material removal decreases exponentially with increasing cumulative media flow volume despite media flow rate increasing. There is a linear correlation between material removal and media flow rate. As a result, material removal can be estimated from media flow rate which can be monitored easily.

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Bańkowski, D., i S. Spadło. "The Aplication of Vibro – Abrasive Machining for Smoothing of Castings". Archives of Foundry Engineering 17, nr 1 (1.03.2017): 169–73. http://dx.doi.org/10.1515/afe-2017-0031.

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Abstract The paper presents the production problems related to casting using precision casting methods. The essential adverse effect of the casting process is the presence of burrs understood as oversize material necessary to remove the next finishing operations. In addition, the surfaces of the cast often characterized by a porous structure. One of the methods to improve the smoothness of the area proposed by the authors is the use of vibro-abrasive finishing. This type of treatment is widely used in the treatment of finishing small objects as well as complex shapes. Objects in the form of casting in the first step was treated with aggressive deburring polyester matrix abrasive media. The second stage was polishing, with using smoothing porcelain media. The study evaluated the effect of vibro-abrasive machining typical cast on the basic parameters of the geometric structure of the surface. Observations using optical microscope Nicon Eclipse MA 200 compared changes in surface microstructure and the effect of deburring. Clearly we can say that vibro-abrasive machining an effective way of reducing the size of burrs, smoothing and lightening the surface of objects made by casting.

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Cheema, Manjot S., Gudipadu Venkatesh, Akshay Dvivedi i Apurbba K. Sharma. "Developments in abrasive flow machining: a review on experimental investigations using abrasive flow machining variants and media". Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 226, nr 12 (8.10.2012): 1951–62. http://dx.doi.org/10.1177/0954405412462000.

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Walia, R. S., H. S. Shan i P. Kumar. "Determining dynamically active abrasive particles in the media used in centrifugal force assisted abrasive flow machining process". International Journal of Advanced Manufacturing Technology 38, nr 11-12 (25.08.2007): 1157–64. http://dx.doi.org/10.1007/s00170-007-1184-8.

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Song, Gui Zhen, Yuan Zong Li i Gang Ya. "Temperature Dependence and Effect on Surface Roughness in Abrasive Flow Machining". Advanced Materials Research 53-54 (lipiec 2008): 375–80. http://dx.doi.org/10.4028/www.scientific.net/amr.53-54.375.

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In this paper we discuss the temperature dependence and its effect on surface roughness. In abrasive flow machining (AFM) process the temperature of media rises drastically due to procedure of being sheared. To examine the effect of media temperature on surface roughness, an experiment system with the functions of controlling, measuring and recording temperature is set up. The variable trend of media temperature is revealed during AFM. Experiments are performed at different temperatures. Experimental results show that the media at high temperature results in less improvement in surface roughness. Therefore the media can have good machining performance in the first few cycles and the media temperature rise rapidly. Finally we conclude that the best workable temperature should be below 25 °C during the AFM.

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Hwang, Jiann-Yang, i Mijeong Lee Jeong. "Separation and Quantitation of Hazardous Wastes from Abrasive Blast Media". Journal of AOAC INTERNATIONAL 84, nr 3 (1.05.2001): 693–98. http://dx.doi.org/10.1093/jaoac/84.3.693.

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Abstract A sample of glass bead abrasive blasting material (ABM) waste, received from Robins Air Force Base (Georgia), was examined to determine whether the waste could be rendered nonhazardous by separating paint contaminants from the ABM. The sample was analyzed with size distribution and toxicity characteristics leaching procedure. A Microtrac analyzer was used to measure the size of fine particles (−325 Tyler mesh), and scanning electron microscopy analysis was performed to identify the nature of the contaminants in the ABM waste. Tests using froth flotation, magnetic separation, desliming, and acid washing were conducted to develop a process for removing the contaminants. A pilot plant test using the developed process rendered 82.1% or the ABM waste material nonhazardous.

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Gudipadu, Venkatesh, Apurbba Kumar Sharma i Nitish Singh. "Simulation of media behaviour in vibration assisted abrasive flow machining". Simulation Modelling Practice and Theory 51 (luty 2015): 1–13. http://dx.doi.org/10.1016/j.simpat.2014.10.009.

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