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Автор: Grafiati

Опубліковано: 11 вересня 2023

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Статті в журналах з теми "FLOW MACHINING PROCESS"

Brar, B. S., R. S. Walia, and V. P. Singh. "Electrochemical-aided abrasive flow machining (ECA2FM) process: a hybrid machining process." International Journal of Advanced Manufacturing Technology 79, no. 1-4 (February 4, 2015): 329–42. http://dx.doi.org/10.1007/s00170-015-6806-y.

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Singh, Sehijpal, and H. S. Shan. "Development of magneto abrasive flow machining process." International Journal of Machine Tools and Manufacture 42, no. 8 (June 2002): 953–59. http://dx.doi.org/10.1016/s0890-6955(02)00021-4.

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Schmitt, J., and S. Diebels. "Simulation of the abrasive flow machining process." ZAMM - Journal of Applied Mathematics and Mechanics / Zeitschrift für Angewandte Mathematik und Mechanik 93, no. 2-3 (February 1, 2013): 147–53. http://dx.doi.org/10.1002/zamm.201200111.

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Gupta, Ravi, Rahul O. Vaishya, Dr R. S. Walia Dr. R.S Walia, and Dr P. K. Kalra Dr. P.K Kalra. "Experimental Study of Process Parameters On Material Removal Mechanism in Hybrid Abrasive Flow Machining Process (AFM)." International Journal of Scientific Research 2, no. 6 (June 1, 2012): 234–37. http://dx.doi.org/10.15373/22778179/june2013/75.

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Ma, Bao Li, Shi Ming Ji, and Da Peng Tan. "Soft Abrasive Flow Machining." Applied Mechanics and Materials 159 (March 2012): 262–66. http://dx.doi.org/10.4028/www.scientific.net/amm.159.262.

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Анотація:

Soft Abrasive Flow Machining (SAFM) was presented as a new finishing process about the existing problems that the irregular surface of plastic mould was polishing difficultly. The paper first introduced the working principle and feature of SAMF. Secondly, the main influences of SAFM were analyzed. The problem of technology and theory urgent to settle was discussed. At the last, the technology development of SAFM was expected.

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Kassim, Noordiana, Yusri Yusof, Mahmod Abd Hakim Mohamad, Mohd Najib Janon, and Rafizah Mohd Hanifa. "Development of STEP-NC Based Machining System for Machining Process Information Flow." Applied Mechanics and Materials 315 (April 2013): 278–82. http://dx.doi.org/10.4028/www.scientific.net/amm.315.278.

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To realize the STEP-NC based machining system, it is necessary to perform machining feature extraction, generating machine-specific information, and creating a relationship between STEP-NC entities. A process planning system of a STEP-NC information flow that starts with constructing a machining feature from a CAD model will be developed. In this paper, a further in-depth study of the implementation and adaptation of STEP-NC in manufacturing is studied. This study will help to understand how the data from CAD/CAM can be converted into STEP-NC codes and the machining process will be based on the STEP-NC codes generated.

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Mahdy, M., M. awad, F. Mansour, and Ebrahim M. elshimy. "Magnetic field effect on Abrasive Flow Machining Process." Engineering Research Journal - Faculty of Engineering (Shoubra) 46, no. 1 (October 1, 2020): 27–32. http://dx.doi.org/10.21608/erjsh.2020.228174.

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Vu, Viet, Yan Beygelzimer, Roman Kulagin, and Laszlo Toth. "Mechanical Modelling of the Plastic Flow Machining Process." Materials 11, no. 7 (July 16, 2018): 1218. http://dx.doi.org/10.3390/ma11071218.

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A new severe plastic deformation process, plastic flow machining (PFM), was introduced recently to produce sheet materials with ultrafine and gradient structures from bulk samples in one single deformation step. During the PFM process, a part of a rectangular sample is transformed into a thin sheet or fin under high hydrostatic pressure. The obtained fin is heavily deformed and presents a strain gradient across its thickness. The present paper aims to provide better understanding about this new process via analytical modelling accompanied by finite element simulations. PFM experiments were carried out on square commercially pure aluminum (CP Al) billets. Under pressing, the material flowed from the horizontal channel into a narrow 90° oriented lateral channel to form a fin sheet product, and the remaining part of the sample continued to move along the horizontal channel. At the opposite end of the bulk sample, a back-pressure was applied to increase the hydrostatic pressure in the material. The experiments were set at different width sizes of the lateral channel under two conditions; with or without applying back-pressure. A factor called the lateral extrusion ratio was defined as the ratio between the volume of the produced fin and the incoming volume. This ratio characterizes the efficiency of the PFM process. The experimental results showed that this ratio was greater when back-pressure was applied and further, it increased with the rise of the lateral channel width size. Finite element simulations were conducted in the same boundary conditions as the experiments using DEFORM-2D/3D software, V11.0. Two analytical models were also established. The first one used the variational principle to predict the lateral extrusion ratio belonging to the minimum total plastic power. The second one employed an upper-bound approach on a kinematically admissible velocity field to describe the deformation gradient in the fin. The numerical simulations and the analytical modelling successfully predicted the experimental tendencies, including the deformation gradient across the fin thickness.

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Uhlmann, E., C. Schmiedel, and J. Wendler. "CFD Simulation of the Abrasive Flow Machining Process." Procedia CIRP 31 (2015): 209–14. http://dx.doi.org/10.1016/j.procir.2015.03.091.

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Chen, Guang Jun, Xian Li Liu, and Cai Xu Yue. "Study on Causes of Material Plastic Side Flow in Precision Hard Cutting Process." Advanced Materials Research 97-101 (March 2010): 1875–78. http://dx.doi.org/10.4028/www.scientific.net/amr.97-101.1875.

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Анотація:

There are many special cutting disciplines needed to research in precision hard cutting process. The plastic side flow on machining surface influences machining surface roughness great. The mathematical model of hump height for surface plastic side flow is built based on the model of precision hard cutting and forming mechanism of surface plastic side flow is analyzed. Effect of cutting feed on the maximum scallop height of machining surface is researched and microscopic observation of surface topography is made through the hard cutting experiment. In certain conditions, the machining surface roughness and the cutting off trace increase with cutting feed. Because of the metal softening, some metal which formed side flow fall off immediately but make plastic flow on the strip edge of machining surface when it flows out tool surface. This research supplied theoretical basis for prediction of hard cutting process surface quality.

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Більше джерел

Дисертації з теми "FLOW MACHINING PROCESS"

DHULL, SACHIN. "INVESTIGATION OF HYBRID ELECTROCHEMICAL AND MAGNETIC FIELD ASSISTED ABRASIVE FLOW FINISHING PROCESS." Thesis, DELHI TECHNOLOGICAL UNIVERSITY, 2021. http://dspace.dtu.ac.in:8080/jspui/handle/repository/18780.

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The current scenario of industrialization requires need for higher productivity which is met by advanced material removal process, i.e., abrasive flow machining (AFM) in which the internal surfaces of the workpiece is machined to higher accuracy level with the help of abrasive laden media. In this paper, the conventional AFM setup has been made hybrid using electrolytic and magnetic force arrangement alongwith rotational effect in order to achieve better results in terms of material removal and surface roughness. The newly developed in-house polymer media were utilized in the process and the input parameters taken during experimentation were magnetic flux, electrolytic rod size and shape, rotational speed, polymer media, abrasive particles and extrusion pressure. It was found that the material removal and surface roughness improvement were more in electrochemo magneto rotational AFM process compared to conventional AFM process. The experimental values were in confirmation with those obtained in the optimization techniques applied, i.e., Taguchi L9 OA, Matlab fuzzy logic and GRA-PCA. In addition, the hybrid mathematical model was developed and effect of different forces occurring in the process and computational flow analysis of media have been explained. With advent of need for fast productivity in terms of material removal and surface roughness of the workpiece, abrasive flow machining (AFM) process is gaining rapid importance in the industries. In this process, the fine finishing of the internal surfaces is done that are difficult to reach spaces using abrasive laden polymer media. The media is extruded past the surface under high pressure with the help of two sets of extrusion piston cylinder arrangements. Further various innovations done in the field of abrasive flow machining have been studied in detail in a tabulated form. It included the applications of the process and the different variant forms of AFM process. Hence it can be concluded that this form of non conventional machining process is efficient both in terms of surface roughness and material removal. The SBR media resulted in maximum material removal during experimentation, i.e., 3.88 mg when input parameters, i.e., electrolytic voltage, number of extrusion cycles and pressure were taken as 18 V, 4 and 10 bar respectively. The NR, NTR and SR media had intermediate effect of material removal but minimum removal of material was achieved in case of PBS media, i.e., 2.39 mg at 6 V voltage, 6 number of cycles and 30 bar pressure. The material removal was first increased with higher rod size but afterwards its increase was lesser. The surface plots obtained from RSM technique showed that MR obtained was 2.25 mg at 21 bar pressure and 7 number of cycles. As compared to conventional AFM setup, it was found that in EMR-AFM setup, 34.5 % and 17.8 % improvement in % Ra and material removal, respectively, was obtained. It was found that MR was approximately 2.9 mg on an average when machining was done on traditional AFM process, while it increased upto 4.5 mg in prepared hybrid machine setup.

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Devotta, Ashwin Moris. "Characterization & modeling of chip flow angle & morphology in 2D & 3D turning process." Licentiate thesis, Högskolan Väst, Forskningsmiljön produktionsteknik(PTW), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-8671.

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Within manufacturing of metallic components, machining plays an important role and is of vital significance to ensure process reliability. From a cutting tool design perspective, tool macro geometry design based on physics based numerical modelling is highly needed that can predict chip morphology. The chip morphology describes the chip shape geometry and the chip curl geometry. The prediction of chip flow and chip shape is vital in predicting chip breakage, ensuring good chip evacuation and lower surface roughness. To this end, a platform where such a numerical model’s chip morphology prediction can be compared with experimental investigation is needed and is the focus of this work. The studied cutting processes are orthogonal cutting process and nose turning process. Numerical models that simulate the chip formation process are employed to predict the chip morphology and are accompanied by machining experiments. Computed tomography is used to scan the chips obtained from machining experiments and its ability to capture the variation in chip morphology is evaluated. For nose turning process, chip curl parameters during the cutting process are to be calculated. Kharkevich model is utilized in this regard to calculate the ‘chip in process’ chip curl parameters. High speed videography is used to measure the chip side flow angle during the cutting process experiments and are directly compared to physics based model predictions. The results show that the methodology developed provides the framework where advances in numerical models can be evaluated reliably from a chip morphology prediction capability view point for nose turning process. The numerical modeling results show that the chip morphology variation for varying cutting conditions is predicted qualitatively. The results of quantitative evaluation of chip morphology prediction shows that the error in prediction is too large to be used for predictive modelling purposes.

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Howard, Mitchell James. "Development of a machine-tooling-process integrated approach for abrasive flow machining (AFM) of difficult-to-machine materials with application to oil and gas exploration componenets." Thesis, Brunel University, 2014. http://bura.brunel.ac.uk/handle/2438/9262.

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Abrasive flow machining (AFM) is a non-traditional manufacturing technology used to expose a substrate to pressurised multiphase slurry, comprised of superabrasive grit suspended in a viscous, typically polymeric carrier. Extended exposure to the slurry causes material removal, where the quantity of removal is subject to complex interactions within over 40 variables. Flow is contained within boundary walls, complex in form, causing physical phenomena to alter the behaviour of the media. In setting factors and levels prior to this research, engineers had two options; embark upon a wasteful, inefficient and poor-capability trial and error process or they could attempt to relate the findings they achieve in simple geometry to complex geometry through a series of transformations, providing information that could be applied over and over. By condensing process variables into appropriate study groups, it becomes possible to quantify output while manipulating only a handful of variables. Those that remain un-manipulated are integral to the factors identified. Through factorial and response surface methodology experiment designs, data is obtained and interrogated, before feeding into a simulated replica of a simple system. Correlation with physical phenomena is sought, to identify flow conditions that drive material removal location and magnitude. This correlation is then applied to complex geometry with relative success. It is found that prediction of viscosity through computational fluid dynamics can be used to estimate as much as 94% of the edge-rounding effect on final complex geometry. Surface finish prediction is lower (~75%), but provides significant relationship to warrant further investigation. Original contributions made in this doctoral thesis include; 1) A method of utilising computational fluid dynamics (CFD) to derive a suitable process model for the productive and reproducible control of the AFM process, including identification of core physical phenomena responsible for driving erosion, 2) Comprehensive understanding of effects of B4C-loaded polydimethylsiloxane variants used to process Ti6Al4V in the AFM process, including prediction equations containing numerically-verified second order interactions (factors for grit size, grain fraction and modifier concentration), 3) Equivalent understanding of machine factors providing energy input, studying velocity, temperature and quantity. Verified predictions are made from data collected in Ti6Al4V substrate material using response surface methodology, 4) Holistic method to translating process data in control-geometry to an arbitrary geometry for industrial gain, extending to a framework for collecting new data and integrating into current knowledge, and 5) Application of methodology using research-derived CFD, applied to complex geometry proven by measured process output. As a result of this project, four publications have been made to-date – two peer-reviewed journal papers and two peer-reviewed international conference papers. Further publications will be made from June 2014 onwards.

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Natale, Lorenzo. "Optimization of liquid flow rate distribution in etching modules through numerical simulationsand experiments." Thesis, KTH, Skolan för kemivetenskap (CHE), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-212556.

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The purpose of this study was to simulate the liquid flow rate distribution in the etching modules and find the optimal setup in order to achieve a distribution as homogenous as possible. The commercial software Matlab 2015a has been employed for all the numerical simulations. The optimization has been carried out varying several parameters, i.e. spray cross sections of the nozzles, the oscillation parameters, the rotating angle of the nozzles within etching module 1 and the nozzle arrangement inside the modules. Furthermore, the optimization has been carried out separately along the two directions of the modules. The results achieved computationally have been validated via experimental procedures. During this study a specific experimental setup has been developed in order to be able to compare experimental and computational results. The validation process has shown that the computational method matches the experimental results to a good extent. The experimental liquid distribution in etching module 2 widely matches the simulations to a quantitative extent, while the one in etching module 1 provides the same qualitative but different quantitative results.

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Moreira, Pâmela Portela. "Ajuste da viscosidade do fluido erosivo para manutenção da eficiência do processo de usinagem por hidroerosão." Universidade Tecnológica Federal do Paraná, 2015. http://repositorio.utfpr.edu.br/jspui/handle/1/1308.

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O processo de usinagem por hidroerosão é utilizado em bicos injetores do sistema diesel para melhorar seu desempenho a partir do arredondamento do raio de entrada dos canais de injeção por onde escoa o diesel para injeção no motor. A eficiência do processo de usinagem por hidroerosão está relacionada às condições do fluido erosivo utilizado no processo, sendo que a viscosidade desempenha papel fundamental para manutenção da eficiência. O acoplamento das partículas abrasivas com o fluido é afetado pela redução da viscosidade que ocorre durante o processo, influenciando assim a eficiência de remoção de material e trazendo perdas de produtividade para o processo, que se torna mais lento para que se atinja a remoção de material especificada. No trabalho em questão, a eficiência do processo foi avaliada durante 160 horas, utilizando correção da viscosidade do fluido erosivo para manutenção da viscosidade próxima à condição inicial de trabalho. A causa para a redução da viscosidade também foi investigada, a partir da avaliação de uma possível contaminação do fluido erosivo por outros fluidos de menor viscosidade existentes no processo. Após 160 horas de monitoramento aplicando-se correção da viscosidade, observou-se a ocorrência de redução da viscosidade do fluido erosivo de 8,8 % considerando a primeira e a última amostra, além de uma redução na eficiência do processo de apenas 4,2 %, em detrimento a uma redução de 20 % observada em estudo anterior, no qual não houve renovação de partículas e ajuste da viscosidade. A contaminação do fluido erosivo pelo óleo de exame utilizado na estação anterior à de usinagem por hidroerosão se mostrou responsável por 37,5 % da redução da viscosidade do fluido ao longo de 40 horas de trabalho.
Hydroerosive grinding process is used on nozzle injectors for diesel system in order to improve its performance by rounding the internal diameter of the injection channels through which flows the diesel for injection in the engine. The efficiency of hydroerosive grinding process is related to the conditions of the erosive fluid used in the process, for which viscosity has a major role for efficiency maintenance. Coupling between particles and fluid is affected by viscosity decrease along time, thus influencing material removal rate efficiency and causing productivity losses, once cycle time increases to achieve the specified material removal rate. In the present investigation, the process efficiency was evaluated during 160 hours using viscosity correction of the erosive fluid in order to keep viscosity close to its initial work condition. The root cause for viscosity decrease was also investigated through evaluation of possible contamination of the erosive media by lower viscosity fluids existing in the process. After 160 hours of process monitoring with viscosity adjustment, it was observed 8,8 % of viscosity reduction considering the first and the last samples, besides that the material removal rate efficiency decreased only 4,2 % over 20 % decrease observed in a previous study related to hydroerosive grinding process without particle replacement and viscosity adjustment. Contamination of the erosive fluid by measurement oil used in the previous station was responsible for 37,5 % of viscosity decrease along 40 hours of production.

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Веремей, Г. О. "Підвищення ефективності процесу відновлення сідел клапанів в авторемонтному виробництві". Thesis, Чернігів, 2015. http://ir.stu.cn.ua/123456789/15624.

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Анотація:

Веремей, Г. А. Повышение эффективности процесса восстановления сёдел клапанов в авторемонтном производстве: дис. ... канд. техн. наук : 05.03.01 / Г. А. Веремей. - Чернигов, 2015. - 183 с.
В диссертационной работе решена актуальная задача повышения эффективности процесса восстановления сёдел клапанов в авторемонтном производстве за счёт увеличения точности и снижения трудоёмкости обработки путём разработки нового технологического оборудования, а также применения более совершенного режущего инструмента и материала. На основе созданных математических моделей установлены теоретические зависимости показателей качества формообразования при растачивании трех внутренних конических поверхностей профильным ориентированным инструментом от режимов обработки и предложен эффективный метод при решении задачи дефектации сёдел клапанов. Посредством проведённых экспериментальных исследований на базе разработанного авторемонтного оборудования и применения современного режущего материала сделаны практические рекомендации по повышению точности формообразования и снижению трудовых затрат в восстановительном ремонте сёдел клапанов газораспределительного механизма двигателя внутреннего сгорания
У дисертаційній роботі вирішена актуальна задача підвищення ефективності процесу відновлення сідел клапанів в авторемонтному виробництві за рахунок збільшення точності і зниження трудомісткості обробки шляхом розробки нового технологічного обладнання, а також застосування більш сучасного різального інструменту і матеріалу. На основі створених математичних моделей встановлені теоретичні залежності показників якості формоутворення при розточуванні трьох внутрішніх конічних поверхонь профільним орієнтованим інструментом від режимів обробки та запропоновано ефективний метод при вирішенні задачі дефектації сідел клапанів. За допомогою проведених експериментальних досліджень на базі розробленого авторемонтного обладнання та застосування сучасного різального матеріалу зроблені практичні рекомендації щодо підвищення точності формоутворення і зниження трудових витрат у відновлювальному ремонті сідел клапанів газорозподільного механізму двигуна внутрішнього згоряння
In the dissertation work the current problem of the efficiency increasing for the valve seats’ overhauled process in auto repairing production was solved. It has been implemented due to increase and labor intensity reduce of working by the development of new technological equipment, as well as better use of the cutting tool and its material. A method of forming surfaces for the valve seat while simultaneous by copied boring of the three conical surfaces with oriented tool was proposed, the usage of which can significantly reduce the complexity of the overhauled process, eliminate manual operations of lapping and improve surface quality. The overhauled equipment based on pneumatic bag was designed and manufactured. It improves the accuracy of the valve seats processing due to the introduction of the original design and technological solutions. The designed equipment was introduced in the current auto repairing production and educational process of the university. The assessment method for the worn surfaces state of the valve seat in the problem of flaw detection was proposed, which allowed to improve the accuracy and eliminate the error of the overhauled process. The general and partial modular 3D models of: the forming process, the flaw detection problem, describe the geometry of surfaces with complicated - variable topography, optimization of processing parameters was designed. The analytical and experimental dependences for the processing parameters on the surface quality rates were obtained. On their basis was made the practical advice on choosing the optimum cutting conditions when overhauling valve seats. The results for precise increasing of the overhauled valve seats’ process, tested on the engine with the diagnostic equipment, allowed to reach improve of the experimental engine performance.

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ALI, PARVESH. "INVESTIGATIONS OF HYBRID THERMAL ABRASIVE FLOW MACHINING PROCESS." Thesis, 2019. http://dspace.dtu.ac.in:8080/jspui/handle/repository/16943.

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Анотація:

Abrasive Flow Machining (AFM) is a nonconventional finishing technique used for the deburring and polishing of the surface and edges through the abrasive laden media. The sharp cutting edges of the abrasive particles abrade the material from the surface and remove the material in the form of micro chips. For the material removal mechanism in AFM process, abrasive particles impart a large amount of force and a lot of energy is lost due to friction between the surface and abrasive particles. This research discuss a new hybrid form of AFM process named as Thermal additive Centrifugal Abrasive Flow Machining (TACAFM), which utilizes the spark energy to melt the surface material and abrasive particles in the media easily removes the material with lesser amount of force and energy loss also minimizes. TACAFM process is a combination of Centrifugal force assisted Abrasive Flow Machining and Electrical Discharge Machining (EDM) process. This process utilizes the EDM mechanism for producing the spark between the rotating electrode and work piece surface. The electrode tip is designed in such a way that it maintains the gap between the electrode tip and the workpiece surface and also it allows the media to pass from one media cylinder to the other. The present work includes mathematical modelling of the developed Thermal additive Centrifugal Abrasive Flow Machining process for the calculation of force exerted by the abrasive particles on the workpiece surface and its material removal due to thermal effect. The mathematical model results were validated through the experimental observations. While finishing the work piece through TACAFM process, higher temperature is developed over the surface due to spark generation. This is important to analyze the temperature distribution over the surface. A simulation model is presented by using ANSYS® 15 software to analyze the effect of temperature around the workpiece surface on changing the gap between the electrode and workpiece surface with variable rotational speed of electrode. The simulation results describe the amount of gap and rotational speed of electrode to be taken for better surface properties. The present work also involves use of the Response surface methodology (RSM) to plan and conduct the experiments and determine the effect of input process variables such as current intensity, duty cycle, abrasive concentration, rotational speed of the electrode and extrusion pressure on material removal, percentage improvement in surface roughness, residual stress, scatter of surface roughness and micro-hardness of the workpiece surface. The finished surface of the components was characterized for the microstructure study using SEM and XRD analysis. The oxide layers and molten material on workpiece surface was also observed from SEM images. The experimental results of xviii TACAFM process showed average 44.34% improvement in material removal compared to conventional AFM process. The results also showed 18.78% error in mathematical modeling results in compared to the experimental results of TACAFM process. The optimum value of material removal and percentage improvement in surface finish was found as 36.571 mg and 42.38 % simultaneously at 12 ampere of current, 0.78 duty cycle, 250 rpm of rotational speed, 10 MPa of extrusion pressure and 0.3 abrasive concentration. The optimum value of residual stress, scatter of surface roughness, micro hardness was found as -151.921 MPa, 0.151 µm and 345.951 HV simultaneously. The 95% confidence interval of the predicted mean for the MR was 31.7542 < MR (mg)< 38.5195, for % improved Ra was 35.5311 < ∆ Ra < 43.0562, for residual stress -285.483 < Residual Stress < -301.458, for Scatter of surface roughness was 0.0921< SSR < 0.209 and for Micro Hardness was 291.367 < Micro Hardness < 350.17. The developed technique is confirmed to be a better process for achieving products having high level of surface integrity.

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Nayak, Swadesh Kumar. "CFD Analysis of Flow Pattern in Electrochemical Machining Process." Thesis, 2015. http://ethesis.nitrkl.ac.in/7579/1/185_(1).pdf.

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CFD Electrochemical Machining process is a non-conventional machining process based on the Faraday‟s laws of electrolysis. It is an advanced machining process that has applications in fields like aerospace, medical technology etc. But still the ECM process has various shortcomings. For instance there are possibilities of passivation and boiling of the electrolyte due to complicated tool design and these results in very poor machining quality. Other problems include metal hydroxide sludge disposal etc. In the ECM process setup, the machines work in the pulsating mode and hence we don‟t get accurate results. Hence the CFD analysis is termed as the most accurate method to predict the flow. This project thesis aims at studying the flow pattern, current density, distribution pattern, pressure distribution, velocity profiles, turbulence etc. The required model was first designed in the CATIA software and then ANSYS –FLUENT software was used to analyze the problem statement. The geometric model consists of a circular iron work piece, a L-shaped tool made up of copper and the electrolyte used is 20% brine solution. The L-Shaped tool has a hole at its top through which electrolyte flows and hits the work piece. The model was stimulated and analyzed to find out the results.

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Dash, Rupalika. "Modeling and CFD Simulation of Abrasive Flow Machining Process." Thesis, 2015. http://ethesis.nitrkl.ac.in/7861/1/2015_MTR_RupalikaDas_613ME3007.pdf.

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The abrasive flow machining (AFM) is a new finishing operation that involves abrasive particles as the tool to remove work material. AFM is broadly known as “no-tool” precision finishing operation and the carrier media containing abrasive particles is called as “self-deformable stone”. In AFM, a semi-solid polymer-based media containing abrasive powders in a particular proportion is flown through the work-piece at a certain pressure. The AFM consists of three major components, i.e. machine, media and tooling or fixture. The machine consists of a frame structure, control system, hydraulic cylinder and the media cylinder. The extrusion pressure for a standard AFM process varies from 10 bars to 100-200 bars. The function of tooling and fixture is to position the work-piece and provide direction to the media flow through the work-piece. The media consists of a carrier, abrasive powder and some additives. The flow of the media can be modeled using finite volume method as it deals with flow of a fluid. In the present work, FLUID FLOW FLUENT available in ANSYS 15 software package was used for the modeling and simulation. A 2D model for a cylindrical work-piece and a 3D model for four rotary swaging dies along with the fixtures have been prepared. Validation has been done for the two models with the existing experimental data. The most affecting flow output parameters like dynamic pressure, velocity and strain rate for different volume fraction and media speed have been analysed. The 3D model was simulated for both the non-granular and granular flow. The effects of different abrasive particles for variable diameter and volume fraction on the flow output parameters like granular pressure and skin friction coefficient have been studied. The flow analysis of the outputs gives a prediction of material removal efficiency.

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Hung, Jung-Chao, and 洪榮昭. "Five-axis Machining Process Planning Research for Axial-flow Compressor Impeller." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/6jm87e.

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碩士
國立臺北科技大學
製造科技研究所
94
Five-axis numerically controlled machining has more recently been applied in national defence and motor vehicle industries to produce precisely complex surface parts, such as aerospace parts, impeller blades, dies and moulds. For promoting the application of five-axis machining technology, this research presents a milling process plan for machining the impeller blades was provided. The impeller of the axial-flow compressor contains a lot of thin blades on the hub of the impeller. In addition, the thin blades of the impeller possess overlapped surfaces and with large blade height/thickness ratio (about 20:1), so that the machining of the impeller is not easy. At the present time, the impeller machining usually adopts five-axis numerically controlled machines because of the tool motion has two additional degrees of freedom compared with traditional three-axis machining. In this paper, a new milling process method for thin blade with twisted ruled surfaces has presented. Our strategy is to change the tool orientation such that the overcut or undercut is minimized. Unigraphics CAD/CAM system, Procam system, and Vericut system were used to model the geometry of the impeller and to simulate and verify the cutting process in five-axis machine (X, Y, Z, A, and B axes). The validity and effectiveness of the blade milling process was demonstrated on Forestline five-axis machine with Num 1060M controller.

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Частини книг з теми "FLOW MACHINING PROCESS"

Uhlmann, E., V. Mihotovic, H. Szulczynski, and M. Kretzschmar. "Developing a Process Model for Abrasive Flow Machining." In Burrs - Analysis, Control and Removal, 73–78. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-00568-8_8.

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Fletcher, A. J., J. B. Hull, J. Mackie, and S. A. Trengove. "Computer Modelling of the Abrasive Flow Machining Process." In Surface Engineering, 592–601. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0773-7_59.

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Jindal, Anil, Sushil Mittal, and Parlad Kumar. "The Magnetically Assisted Abrasive Flow Machining Process: Review." In Lecture Notes in Mechanical Engineering, 229–39. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-0909-1_23.

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Prasad, P. S. S. R. K., Navneet Verma, Narendra Kumar, and K. M. Rajan. "Study and Establishment of Manufacturing Process of Molybdenum Liners Using Warm Flow Forming Process." In Advances in Forming, Machining and Automation, 105–16. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-32-9417-2_8.

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Kainrath, Martin, Mohamed Aburaia, Kemajl Stuja, Maximilian Lackner, and Erich Markl. "Accuracy Improvement and Process Flow Adaption for Robot Machining." In Lecture Notes in Mechanical Engineering, 189–200. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-62784-3_16.

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Dhull, Sachin, Qasim Murtaza, R. S. Walia, M. S. Niranjan, and Saloni Vats. "Abrasive Flow Machining Process Hybridization with Other Non-Traditional Machining Processes: A Review." In Proceedings of International Conference in Mechanical and Energy Technology, 101–9. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-2647-3_10.

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Kumar, Sudhanshu, Dharmendra Kumar, and Dilip Sen. "Study of Gap Flow Simulation for Machining Gap in Electric Discharge Machining process—A Review." In Lecture Notes in Mechanical Engineering, 223–30. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-2921-4_21.

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Bhardwaj, Anant, Parvesh Ali, R. S. Walia, Qasim Murtaza, and S. M. Pandey. "Development of Hybrid Forms of Abrasive Flow Machining Process: A Review." In Lecture Notes in Mechanical Engineering, 41–67. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-6412-9_5.

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Sharma, Sahil, Tarlochan Singh, and Akshay Dvivedi. "Post-Processing of Additive Manufactured Components Through Abrasive Flow Machining Process." In Handbook of Post-Processing in Additive Manufacturing, 169–80. New York: CRC Press, 2023. http://dx.doi.org/10.1201/9781003276111-9.

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Liu, Hui, Markus Meurer, and Thomas Bergs. "Three-Dimensional Modeling of Thermomechanical Tool Loads During Milling Using the Coupled Eulerian-Lagrangian Formulation." In Lecture Notes in Production Engineering, 318–30. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-34486-2_23.

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AbstractMilling is a complex process where machining quality is influenced by tool geometry, chip flow, temperature, and wear. In recent years, the rapid development of computer technology has enabled the use of finite element simulation methods to study the relationship between the machining results and various process parameters. In this study, a three-dimensional thermal coupled Euler-Lagrange milling model is proposed. This approach provided unique advantages in terms of stability and computational speed. The simulation results showed a good agreement with the corresponding experimental cutting tests and provided further information on the heat source distribution characteristics, which form a basis for further theoretical investigations.

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Тези доповідей конференцій з теми "FLOW MACHINING PROCESS"

Han, Zhao, and Fan Qingming. "Design and Simulation Analysis of Flow Field in Turbine Blades ECM Process." In Proceedings of the 2019 International Conference on Precision Machining, Non-Traditional Machining and Intelligent Manufacturing (PNTIM 2019). Paris, France: Atlantis Press, 2019. http://dx.doi.org/10.2991/pntim-19.2019.13.

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Tsuboi, Ryo, and Makoto Yamamoto. "Modeling and Applications of Electrochemical Machining Process." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-12552.

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Electrochemical Machining (below ECM) is one of advanced machining technologies and has been developed and applied in highly specialized fields, such as aerospace, aeronautics, defense and medical industries. In recent years, ECM is used in other industries such as automobile and turbo-machinery because of the following advantages. That is, it has no tool wear, and it can machine difficult-to-cut metals and complex geometries with relatively high accuracy. However, ECM still has some problems to be overcome. The efficient tool-design procedure, electrolyte processing, disposal of metal hydroxide sludge are the typical issues. In order to solve these problems, a numerical simulation is considered to be a powerful tool. However, the numerical code that can satisfactorily predict the flow field and the machining process has not been developed because of the complex flow natures such as the three-dimensionality, hydrogen bubble/metal sludge generation (i.e. three-phase effect), temperature increase and flow separation. In present paper, summery of my PhD works is mentioned, about modeling and applications. Modeling for ECM process takes into account metal dissolution, electrolyte flow, void fraction distribution of hydrogen bubbles generated from the tool cathode, thermal, electric potential, and electric conductivity. Especially, two types of method are used for the coupling between gas- and liquid-phase in electrolyte. One is one-way coupling method; only the electrolyte flow affects the void fraction distribution of hydrogen bubbles. The other is two-way coupling method; considering the interaction between the electrolyte flow and the void fraction distribution. In the two-way coupling method, considering bulk density distribution in the electrolyte flow path due to hydrogen bubble, Low-Mach-Number approximation is used for simulations. For applications with our numerical code, simulations for machining 3-D compressor blade are performed. Blade geometry is successfully predicted and we can obtain some guideline of ECM process.

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Yang, Z. Y., and Y. H. Chen. "Process Planning in Layer-Based Machining." In ASME 2001 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/detc2001/dfm-21165.

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Abstract Some freeform surfaces cannot be machined by traditional CNC machining because of the inaccessibility to some critical points. Layer-based machining system developed by the authors can enlarge the accessibility by building a model layer by layer. Each layer is shaped by 5-axis machining. In this paper, the overall process planning techniques are identified and analyzed. The data flow chart in layer-based machining is established. The concepts of “decomposition for accessibility” and “decomposition for manufacturability” are proposed to decompose the model into manufacturable parts, which is called slabs. Adaptive slicing and interference avoidance algorithms are developed to achieve the maximum accessibility. A method called stock layer combination is proposed to select available stock layers for the process.

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Perry, Winfield B., and John Stackhouse. "Gas Turbine Applications of Abrasive Flow Machining." In ASME 1989 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1989. http://dx.doi.org/10.1115/89-gt-165.

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Abrasive Flow Machining (AFM) is a non-traditional finishing method used for precision deburring, edge contouring, surface improvement and the removal of abusive machining and thermal recast layers. A firm-bodied abrasive laden compound is flowed at pressures of 75–500 psi (5–35 bar) across selective features of a fixtured workpiece. Gas turbine components benefited by this method include: axial and centrifugal rotors, stators, turbine blades, compressor and turbine disks, shafts, seals and other rotating parts. AFM process principles are explained and specific applications are reviewed.

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Matsumura, Takashi, and Yuji Musha. "Cutting Process Simulation in Micro Dimple Machining." In ASME 2019 14th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/msec2019-2954.

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Abstract The paper discusses micro dimple millings with inclined ball end mills. Cutting process models are presented to control the dimple shapes and predict the cutting forces. In micro dimple milling, the cutter rotation axis is inclined to have the non-cutting time, during which the cutting edges don’t remove the material in a rotation of cutter. The end mill is fed at a high rate so that the machining areas removed by the cutting edges are not overlapped each other. The shapes and the alignment of the dimples are simulated for the cutting parameters in the mechanistic model. Then, the cutting forces are predicted for high machining accuracies. The cutting experiments were conducted to verify the micro dimple machining. The dimple shape model is validated in comparison between the simulated and the actual dimple shapes. The cutting forces are simulated to compare the measured ones. The force model works well to predict the cutting forces with the chip flow direction during a rotation of the cutter.

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Hsu, Fu-Chuan, Tsung-Pin Hung, Yunn-Shiuan Liao, Shih-Ming Wang, Ming-Chyuan Lu, Ying-Cheng Lu, and Ho-Chung Fu. "Post-Treatment Process of Additive Manufacturing for Intramedullary Nails by Ultrasonic Vibration Machining, Abrasive Flow Machining, and Electropolishing Technology." In 4M/IWMF2016 The Global Conference on Micro Manufacture : Incorporating the 11th International Conference on Multi-Material Micro Manufacture (4M) and the 10th International Workshop on Microfactories (IWMF). Singapore: Research Publishing Services, 2016. http://dx.doi.org/10.3850/978-981-11-0749-8_711.

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Brar, B. S., R. S. Walia, V. P. Singh, and P. Singh. "Effects of Helical Rod Profiles in Helical Abrasive Flow Machining (HLX-AFM) Process." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-53711.

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Abrasive flow machining (AFM) process is a fine finishing process employing abrasive laden self modulating putty for the finishing of mainly internal recesses. Though the AFM is suitable for the finishing of internal cavities, but the material removal is very low during this finishing process. Helical abrasive flow machining (HLX-AFM) has been recently developed to improve the machining efficiency of AFM process. This process employs a coaxially fixed helical twist drill-bit during the extrusion of the abrasive laden media through an internal cylindrical recess. The presence of a fixed drill-bit inside a cylindrical cavity of the work-piece results in considerable increase in material removal and improvement in surface finish. In the present investigation, the same HLX-AFM setup has been used and the effects of two more helical profile rods viz. a 3-start helical profile and a spline have been studied along with the helical twist drill-bit for improving the quality characteristics of material removal and percentage improvement in the surface roughness during the fine finishing of internal cylindrical surface of brass work-pieces. The experiments were planned according to L9 orthogonal array of Taguchi method and the optimal process parameters were selected. The employment of a rod with six splines and a 3-start helical profile results in improved finishing in comparison to the drill-bit profile, due to the presence of more number of flutes and grooves on the coaxially held stationary rods. The helical profile type has 3.75% contribution towards the percentage improvement in the surface roughness, but is not significant in affecting material removal. The presence of 3-start helical profile led to 61.40% improvement in surface roughness (from Ra - 1.3 μm to 0.5 μm) at optimal level with no effect on material removal, which means no extra machining is taking place. The parameter of abrasive-to-media concentration ratio (varying from 0.75 to 1.25) is the most contributing factor with 85.90% contribution toward suface finish improvement and 71.71% contribution towards material removal. The finishing performance of 3-start profile is 15% better than the standard helical drill-bit with no increase in the operating pressures. SEM micrographs corroborated the fact that 3-start profile led to more number of light abrasive cutting grooves and thus more surface finish. HLX-AFM with 3-start helical profile rods can be employed for the finishing, form corrections of internal cylindrical cavities of any size. Presence of the profile rod results in increase in the reduction ratio and thus more machining action. The developed process can also generate cross-hatch lay pattern on internal cylindrical surfaces.

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Tsuboi, Ryo, Kazuyuki Toda, Makoto Yamamoto, Ryuki Nohara, and Dai Kato. "Modelling of Three-Phase Flow in Electro-Chemical Machining." In ASME 2005 Fluids Engineering Division Summer Meeting. ASMEDC, 2005. http://dx.doi.org/10.1115/fedsm2005-77435.

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Electro-Chemical Machining (ECM) is an advanced machining technology. It has been applied to highly specialized fields such as aerospace, aeronautics and medical industries. However, it still has some problems to be overcome. The efficient tool-design, electrolyte processing, and disposal of metal hydroxide sludge are the typical issues. To solve such problems, CFD is considered to be a powerful tool in the near future. However, the numerical method that can satisfactorily predict the flow has not been established because of the complex flow natures. In the present study, we investigate the modelling of the three-phase flow (i.e. fluid, hydrogen bubble and metal sludge) in ECM process. First, the developed code is applied to the two-dimensional channel configuration. The interactions among three-phases and the dissolved wall are simulated, to verify the modelling and to determine the model parameters, Next, the sinusoidal channel is machined by our code. It is confirmed that hydrogen bubbles in the separation region suppress the dissolution of the wall, and make the final wall shape be wavy. Through this study, it is exhibited that our developed model and code are sound and useful for simulating ECM process.

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Yeung, Ho, Yang Guo, James B. Mann, W. Dale Compton, and Srinivasan Chandrasekar. "A Comparative Study of Energy and Material Flow in Modulation-Assisted Machining and Conventional Machining." In ASME 2014 International Manufacturing Science and Engineering Conference collocated with the JSME 2014 International Conference on Materials and Processing and the 42nd North American Manufacturing Research Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/msec2014-4040.

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A study has been made of deformation, forces and energy in modulation-assisted machining (MAM), wherein chip formation occurs in the presence of a controlled, low-frequency modulation superimposed on to the machining. A unique feature of the study is the use of high speed in situ imaging and image analysis to map material flow in the chip formation zone at high resolution; and simultaneous measurements of tool motions and forces, such that the instantaneous forces can be overlaid onto the chip formation process. The measurements show that the observed significant reductions in specific energy in MAM relative to conventional machining, when cutting ductile metals such as copper and Al 6061T6, are a consequence of chip formation with reduced strain levels in MAM. Additional insights into the chip formation are obtained by examining the effects of a chip aspect ratio parameter.

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Lortz, Wolfgang, and Radu Pavel. "Fundamental Process Mechanics Common to Machining and Grinding Operations." In ASME 2020 15th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/msec2020-8371.

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Abstract All different production processes have one thing in common: in each case a workpiece with characteristic material behavior, stress, strain, self-hardening and temperature will be produced by a tool with special geometry and individual kinematic conditions, with a wide range of energy in a designed machine tool which is working along programmed lines. For the workpiece material, it is not important from which machine the energy is coming. To be able to predict more accurate values of the production process, it will be necessary to focus more on the complex and difficult process mechanics. The result must have a strong physical base and be in good agreement with practical results To solve these problems, we have to uncover all previous simplification assumptions for the existing models. This leads in a first step to a new fundament in process mechanics, which is only based on mathematics, physics and material behavior with friction conditions, and resulting temperatures during metal plastic flow. The new mathematical equations developed for yield shear stress and strain rate will be presented and discussed in this paper. The plastic deformation is the only parameter that will not disappear after completing the operation. Therefore, this will be the base to compare the developed theoretical deformation with the experimental results for two operations: cutting and grinding. In addition, it could be shown that yield shear stress and corresponding strain rate versus temperatures have an interdependent relationship, which creates the opportunity to determine the temperatures during metal plastic flow.

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