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Artykuły w czasopismach na temat "Green Cutting Fluid"
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Li, Yun Chao, Yu Hua Zhang i Bo Sun. "High Speed Dry Cutting Technology Applications in Production". Applied Mechanics and Materials 190-191 (lipiec 2012): 93–96. http://dx.doi.org/10.4028/www.scientific.net/amm.190-191.93.
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Green cutting processing technology is a kind of full consideration of the environmental and resource issues processing techniques, It requires throughout the process do to the environment pollution to the minimum and the utilization rate of the highest. In the machining process without any cutting fluid of dry cutting is control environmental pollution source of a green manufacturing process, it can have clean scraps, no pollution, save the cutting fluid and the processing of costs, can further reduce the production cost. Therefore, the future direction of the cutting process is not or with as little as you cutting fluids, and energetically develop on the ecological environment and human health negative effects of small, processing the superior performance of cutting fluids, and environmental work to completely harmless green cutting fluid development direction.
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Jiang, Zhi Gang, Hua Zhang i Xiao Luo. "Study on the Cutting Technology Based on Green Manufacturing". Key Engineering Materials 375-376 (marzec 2008): 158–62. http://dx.doi.org/10.4028/www.scientific.net/kem.375-376.158.
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Green Manufacturing is a sustainable development model in modern manufacturing. From the perspective of green manufacturing, the environmental impacts of cutting fluid in cutting process was analyzed, the design strategy without cutting fluid in green cutting technology was studied, and some measures on machine tool design and the thermal deformation reduction of workpiece and machine were presented.
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., Jagadish. "GREEN CUTTING FLUID SELECTION USING MOOSRA METHOD". International Journal of Research in Engineering and Technology 03, nr 15 (25.05.2014): 559–63. http://dx.doi.org/10.15623/ijret.2014.0315105.
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Wu, C., i Xiao Ming Jia. "Study on Preparation and Properties of Environment-Friendly Cutting Fluid". Key Engineering Materials 392-394 (październik 2008): 172–76. http://dx.doi.org/10.4028/www.scientific.net/kem.392-394.172.
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Using environment-friendly cutting fluid in the process of metal cutting is one of the valid paths to carry out the green manufacturing. Using metacrylic acid ester, castor oil and boride as the main raw materials, a new type of environment-friendly water-base cutting fluid had been obtained. The main components of this cutting fluid are some kind of high molecular polymer and some kind of B-containing castor oil EP agents. The test results show that the cutting fluid has good stability, antirust property and biodegradability. The maximal non-chucking load value (PB) of the cutting fluid, whose consistency is 5%, can be 1068N. In the comparison with dry cutting, cutting force using environment-friendly cutting fluid is reduced by 23% in a certain condition. Using this cutting fluid can raise stock-removing efficiency and cutting quality, and extend the service life of cutting-tool. And this cutting fluid is harmless to operators and free from pollution to the environment. Expansion and application of the environment-friendly cutting fluid are advantageous to promote the development of the green manufacturing.
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Wu, Chao, Xiu Ling Zhang i Xiao Ming Jia. "Study on Green Design and Biodegradability of B-Containing Water-Based Cutting Fluid". Key Engineering Materials 407-408 (luty 2009): 309–12. http://dx.doi.org/10.4028/www.scientific.net/kem.407-408.309.
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Cutting fluid occupies an important position in the metal processing. The performance and pollution problem brought to the environment of cutting fluid are paid attention to day by day. Proceed from the perspective of green design, using castor oil which has a good biodegradability, triethanolamine, boric acid and the sodium polyacrylate whose molecular weight is less than 2×104 as the main raw materials, a boron-containing water-based cutting fluid had been obtained. The performance of B-containing water-based cutting fluid are measured according to GB/T6144-1985 regulation which is the technical requirements of synthetic cutting fluid. And the biodegradability of mineral oil, castor oil, modified castor oil and B-containing water-based cutting fluid are measured by improved Storstroem Test (OECD301B). The test results show that the B-containing water-based cutting fluid has a good performance of physical and chemical. And the biodegradation rate of the cutting fluid is 87%, which indicates the cutting fluid has a good biodegradability.
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Zhang, Ju Lie, i P. N. Rao. "Green/Sustainable Manufacturing — Evaluation of a Soybean-Based Metal Cutting Fluid in Turning Operation". Applied Mechanics and Materials 392 (wrzesień 2013): 925–30. http://dx.doi.org/10.4028/www.scientific.net/amm.392.925.
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Green manufacturing is a method in which products are produced by consuming less energy and natural resources and being safe to employees, consumers, environment and society. This paper presents an experimental study that compares the machining characteristics when a soy-based cutting fluid and petroleum-based alternate are used in turning medium and high carbon alloy steels. The result of the study will provide reference for cutting fluid management personnel to make proper decision to substitute traditional cutting fluids with the environment-friendly product.
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Zhong, Wei Wu, Dong Biao Zhao, Xi Wang i Hui Yu. "Adaptive Fuzzy Control of Cutting Temperature Based on Cutting Fluid in High-Speed Machining". Advanced Materials Research 97-101 (marzec 2010): 2381–86. http://dx.doi.org/10.4028/www.scientific.net/amr.97-101.2381.
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Green manufacturing is the theme of manufacturing industry in the 21st century. The environment can be seriously polluted by a large quantity of waste cutting fluid .In manufacturing industry, it’s critical to restrict the quantity of waste cutting fluid poured in the environment in order to assure a green earth. Cutting temperature has a major impact on processing quality. A stable cutting temperature means a high quality process. Cutting temperature is also a comprehensive embodiment of process state. In order to control cutting temperature in an appropriate level, an adaptive fuzzy control system is developed to control the flow of cutting fluid injected to machining tool and workpiece which can not only reduce the consumption of cutting fluid but also ensure process quality. Simulation and experiment results show that this control system can achieve the desired purpose.
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Katna, Rahul, Kanwarjeet Singh, Narayan Agrawal i Swati Jain. "Green manufacturing—performance of a biodegradable cutting fluid". Materials and Manufacturing Processes 32, nr 13 (10.05.2017): 1522–27. http://dx.doi.org/10.1080/10426914.2017.1328119.
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Ni, Jing, Kai Feng, Lihua He, Xiaofan Liu i Zhen Meng. "Assessment of water-based cutting fluids with green additives in broaching". Friction 8, nr 6 (2.10.2019): 1051–62. http://dx.doi.org/10.1007/s40544-019-0318-y.
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Abstract In order to improve the cutting performance in broaching, the lubrication and cleaning effects offered by water-based cutting fluids with green additives need to be studied from the viewpoint of green manufacturing. Therefore, water-based solutions with castor oil, surfactant (linear alkylbenzene sulfonate, LAS), and nanographite were prepared by ultrasonic agitation and sprayed into the zone of broaching via atomization. The performances of the cutting fluids, in terms of the viscosity, specific heat, wetting angle, and droplet size, were evaluated to discuss their effects on the broaching load. Among the fluids, the addition of LAS into oil-in-water (WO-S), where its cutting fluid with 10 wt.% castor oil and 1.5 wt.% surfactant, exhibited the lowest broaching force. With regard to the lubricating and cleaning mechanisms, WO-S has good wettability and permeability, and hence, can lubricate the cutting edge of the tool to decrease the cutting load, cool the cutting edge to keep it sturdy, and clean the surface of the cutting edge to keep it sharp. The results reveal that the simultaneous addition of castor oil and LAS had remarkable effects on the lubrication and cleaning, and resulted in a broaching load reduction of more than 10% compared to commercial cutting fluids. However, the addition of nanographite could not improve the lubrication owing to its agglomeration.
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Lee, T. S., C. F. How, Y. J. Lin i T. O. Ting. "An investigation of organic mixed coolant (Palm Olein) for green machining". Industrial Lubrication and Tribology 66, nr 2 (4.03.2014): 194–201. http://dx.doi.org/10.1108/ilt-11-2011-0088.
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Purpose – The purpose of this paper is to investigate and contribute to a better understanding of cutting process characteristics using the proposed RBD Palm Olein-based organic mixed coolant. Design/methodology/approach – In this research, refined, bleached and deodorized (RBD) Palm Olein is selected as the base oil for organic coolant and mixed coolant (base oil mixed with chemicals) to compare with the cutting performance of industrial water-soluble chemical (inorganic) coolant. Using coated carbide tool, JIS SS400 Mild Steel was tested in milling process. At fixed spindle speed, the relations between feed rate and depth of cut (DOC) on cutting temperature and surface roughness were investigated. Also, the dynamic viscosity, specific heat capacity and pH level for each coolant are taken into consideration. Findings – As predicted, cutting fluid with lower viscosity removes more heat. The cutting temperature increased with increasing feed rate and DOC. However, surface roughness increased with increasing feed rate but decreased with increasing DOC. From the data gathered, the proposed RBD Palm Olein-based organic mixed coolant showed better heat removal properties than organic coolant and it produced a far better machined surface than inorganic coolant. Originality/value – Overall, the proposed organic mixed coolant has shown great potential to be a good cutting fluid when balance between cooling properties and lubricity, and consistent quality of cutting fluids are sought to produce environmental friendly quality workpiece.
Rozprawy doktorskie na temat "Green Cutting Fluid"
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Suvin, P. S. "Synthesis and testing of eco-friendly, non-toxic cutting fluid emulsions". Thesis, 2018. https://etd.iisc.ac.in/handle/2005/5356.
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The evolutions in the development of metal working fluid (MWF) from petroleum based products have brought remarkable changes to the present growing machining industry. The established MWF/Cutting fluids have reduced the machining time and increased tool life resulting in economic profits. Even though the use of petroleum oil based cutting fluid have on one side made a significant contribution to the present industry, it has on the other side have exponentially accelerated the rate of environmental pollution. Commercial Cutting Fluids (CCF) generally synthesized using mineral oil or its derivatives, are mostly highly toxic and detrimental to the health of the workers. Furthermore, unregulated and unethical disposal of used cutting fluids by industries would create an environmental disaster. This is due to the difficulties in handling and disposal of degraded or toxic used cutting fluid. Hence, there is an urgent need for the development of an alternative, sustainable, non- toxic and completely bio-degradable cutting fluid to replace the mineral oil based cutting fluid. Thus the need of the hour for an alternative base oil has made tribologists think of vegetable oil-based cutting fluids. Among vegetable oils, coconut oil has superior inherent tribological properties such as low coefficient of friction, high resistance to wear and higher thermal stability characteristics when compared to other vegetable oils.
In the present work, a Green Cutting Fluid (GCF)/metal cutting fluid emulsion is developed from coconut oil using non-toxic emulsifiers and additives. Further, sustainability of the developed cutting fluid was considered and processes were selected to follow closed loop philosophy and its properties were compared to CCF of the same grade. The properties of the cutting fluid were evaluated as per standard test procedures. Emulsion stability was evaluated using Dynamic Light Scattering (DLS) equipment by measuring particle size and zeta potential, pH measurement and oven tests. All the ingredients added to make the green cutting oil was tested for toxicity following Organisation for Economic Cooperation and Development (OECD-203) acute fish toxicity test procedure. Toxicity evaluations of fresh and used metal working fluids were carried out using Fish Embryo Test- FET (OECD-236) and Skin cell viability studies to study the effect of cutting fluids in aquatic system and human skin respectively. Anti-corrosion characteristics of cutting fluid samples were evaluated as per guidelines of American Standard for Testing Materials (ASTM) D4627 standard and in house developed weight loss method. Bacteriological analysis of GCF and CCF was carried out using different culture and plating techniques. Biochemical Oxygen Demand (BOD) test and Chemical Oxygen Demand (COD) test has been carried out to evaluate biodegradability aspect of GCF and CCF. The machining capability of the newly formulated metal cutting oil emulsion was studied through drilling and turning experiments. Further, the study covers testing of the cutting fluids using the novel tool-chip-tribometer and development of a novel lathe tribometer setup that can render friction value in-situ of newly generated surfaces during machining.
The results procured from emulsion stability test, toxicity test, tribological test, antibacterial test, biodegradability test, corrosion test and machining test infer coconut oil based cutting fluid to have competent properties compared to CCF. Thus, the newly developed cutting fluid from coconut oil is a potential alternative for commercially available metal working fluid.
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Zhang, Yanqiao. "The Experimental Evaluation of Environmentally Friendly Cutting Fluids in Micro-Milling". Thesis, 2013. http://hdl.handle.net/1828/4879.
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In manufacturing, cutting fluids promote machining performance by removing heat, lubricating the cutting zone, flushing away chips, and preventing in process corrosion. To synthetize conventional metalworking fluids (MWFs), aside from choosing from a selection of base oils, an array of additives are also typically added. In traditional cutting fluid applications, the cost of waste fluid treatment is enormous. Moreover, the treatment is not always effective and disposal may lead to unexpected environmental contamination. The bacteria and chemical elements in the waste liquids may also introduce health and safety concerns. For the milling process at the micro-scale, i.e., micro-milling, traditional flood cooling may not be suitable. Since the cutting zone between the tool flank and workpiece is in the order of micrometers, the liquid surface tension of flood coolant would impede effective cooling and lubrication of the cutting fluid especially at a high spindle speed for tools. So for micro-milling, some researchers have tried to use minimum quantity lubrication method to apply cutting fluids. Other semi-dry methods like atomization method based on an ultrasonic atomizer have also been tested. However, even though these systems are able to decrease the amount of cutting fluids, the atomization of conventional cutting fluids with harmful surfactants (especially water miscible MWFs) and additives inside would still pose problems related to health hazard and contamination. Thus, new systems and/or green cutting fluids that eliminate the use of undesired surfactants or additives need to be developed. In this thesis, efforts to solve these problems for micro-milling operations are presented.
Firstly, canola oil is selected and used to be emulsified in distilled water through ultrasonic atomization without any surfactant. Then, the emulsified water and oil solution is applied as cutting fluid in micro-milling, and the cutting performance results are compared to those with dry machining and traditional cutting fluid – 5% TRIM aqueous solution. The experimental results show that smaller chip thickness, and burr amount are observed with canola oil-in-water emulsion compared to conventional MWF. Reduction of almost 30% in cutting forces has also been achieved.
Secondly, development of a new atomization-based cutting fluid system is introduced. Both cooling and lubricating capabilities of the cutting fluids are achieved using air-mixed water and oil mists, requiring no surfactants. Experiments are then conducted to evaluate the new system and the air-mixed jet of independently atomized water and oil sprays and compared to results with water only, oil only, and conventional cutting fluid (5% TRIM) conditions. The results reveal the mixture of water and oil leads to best performance in cooling and lubrication during micro-milling. The new system is proved to be effective in cooling and lubricating the cutting zone for both Al6061 and steel 1018. This atomization system is considered as a novel application method to apply totally green cutting fluids.
Finally, a novel environmentally friendly additive was added to conventional cutting fluids. In this thesis, lignin powder obtained from wood is considered as one kind of these “green” additives. It is firstly tried to be dissolved in 5% TRIM aqueous solutions in 8 different concentrations through injection and atomization methods. Then, those lignin containing cutting fluids are used to run micro-milling experiments and compared with 5% TRIM. Nine MWFs are all nebulized by a nebulizer to cool and lubricate the workpiece. The results show that the concentration of 0.015% lignin leads to the least cutting forces, tool wear and burrs. The obtained solution (f) with 0.15% lignin inside causes cutting forces that are just 50% in value of those with 5% TRIM. Considering lignin’s anti-oxidative characteristic and its performance in improving machining processes, it is a promising additive in MWFs.Graduate
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yanqiaoz@uvic.ca
Części książek na temat "Green Cutting Fluid"
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Ademuyiwa, F., S. A. Afolalu, O. O. Yusuf i M. E. Emetere. "Influence of Cutting Fluid and Parameters on Machining and Cooling Techniques in Recent Technology". W Green Energy and Technology, 55–73. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-95820-6_6.
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Katna, Rahul, Mohammed Suhaib, Narayan Agrawal, Swati Jain, Kanwarjeet Singh i S. Maji. "Experimental Study on Effect of Green Cutting Fluid and Surfactant on Temperature in Turning Operation". W Lecture Notes in Mechanical Engineering, 437–49. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-32-9931-3_42.
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Goswami, Shankha Shubhra, i Dhiren Kumar Behera. "Implementation of COPRAS and ARAS MCDM Approach for the Proper Selection of Green Cutting Fluid". W Lecture Notes in Mechanical Engineering, 975–87. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-4795-3_90.
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Edachery, Vimal, Sindhu Ravi, Aliya F. Badiuddin, Abel Tomy, P. S. Suvin i Satish V. Kailas. "Effect of Surface Topography and Roughness on the Wetting Characteristics of an Indigenously Developed Green Cutting Fluid (GCF)". W Sustainable Material, Design, and Process, 185–204. Boca Raton: CRC Press, 2023. http://dx.doi.org/10.1201/9781003242291-9.
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Kuram, Emel, Babur Ozcelik i Erhan Demirbas. "Environmentally Friendly Machining: Vegetable Based Cutting Fluids". W Green Manufacturing Processes and Systems, 23–47. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-33792-5_2.
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Padmini, R., i Vivek Balakrishnan. "Application of Additive Dispersed Green Cutting Fluids in Machining". W Lecture Notes in Mechanical Engineering, 583–91. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-32-9931-3_56.
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Avram, Oliver, Ian Stroud i Paul Xirouchakis. "Green Computing as an Ecological Aid in Industry". W Sustainable ICTs and Management Systems for Green Computing, 132–45. IGI Global, 2012. http://dx.doi.org/10.4018/978-1-4666-1839-8.ch006.
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This chapter concerns the use of computing for ecological evaluation in the manufacturing industry. Here, ecological evaluation means identification and quantisation of various manufacturing process characteristics from the point of view of the environment. Manufacturing is a complex process with many different interactions between the parameters controlling the manufacturing machine tools. In the past, manufacturing planners and operators have set these parameters without understanding the consequences, leading to resource waste of energy, cutting fluid, and so on. This chapter presents a computer tool for evaluating and quantifying the effects of different manufacturing choices using chosen criteria. The tool was implemented as part of the work for a European project. It is based on an extensive analysis of machine tools to provide a way of handling the complexities of understanding the use phase of products.
Streszczenia konferencji na temat "Green Cutting Fluid"
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da Silva, Rosemar Batista, Álisson Rocha Machado, Déborah de Oliveira Almeida i Emmanuel O. Ezugwu. "Turning of SAE 1050 Steel With Vegetable Base Cutting Fluid". W ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-88515.
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The study of cutting fluid performance in turning is of great importance because its optimization characteristics has associated benefits such as improved tool life and overall quality of machined components as well as reduction in power consumption during machining. However, there are recent concerns with the use of cutting fluids from the environmental and health standpoints. Since environmental legislation has become more rigorous, the option for “green machining” attracts the interest of several manufacturing companies. It is important to consider the cost of machining which is associated with tool wear, depending on the cutting environment. The use of vegetable oil may be an interesting alternative to minimize the health and environmental problems associated with cutting fluids without compromising machining performance. This paper presents a comparative study of mineral and vegetable cutting fluids in terms of tool wear after turning SAE 1050 steel grade with cemented carbide cutting tools. Constant depth of cut of 2mm and variable cutting speed (200 and 350 m/min) and feed rate (0.20 and 0.32 mm/rev) were employed. Test results suggest that is possible to achieve improvement in machinability of the material and increase tool life by using vegetable cutting fluid during machining. Tool life increased by about 85% when machining with vegetable-based fluids compared to mineral-based fluids. Analysis of the worn tools, however, revealed a more uniform wear on the worn flank face when machining with mineral-based fluids.
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Ruszkiewicz, Brandt J., Zachary C. Reese i John T. Roth. "Feasibility of End Mill Cooling Using the Venturi Effect With Compressed Air". W ASME 2015 International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/msec2015-9430.
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In many machining applications tool wear is a major problem. Cutting edges on tools wear out with repeated use leading to their inevitable failure. This tool failure causes a poor surface finish on the work piece being cut. Currently cutting fluid is applied during the cutting process to extend the life of a tool and is effective. Cutting fluid is considered a hazardous material which causes problems during disposal. Disposal of hazardous waste can be expensive causing a push to find alternate green cooling methods. This paper focuses on the feasibility of using the venturi effect on compressed air to replace water based cutting fluids. The two processes are to be compared on the grounds of cooling of the tool and work piece as well as chip removal. Cooling comparisons will be made through the examination of a straight channel cut, and chip removal will be gauged by how large of a mass the air streams can move. It was found that, in these areas, an accelerated stream of compressed air through the correct diameter nozzle outperforms the liquid cutting fluid in both aspects during end milling operations. These findings lead the authors to believe that in the future compressed air, or other pressurized gas, will be the most economical and effective green cooling technique.
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Samy, Ayman. "Cutting Re-injection CRI Uncertainty and Risk Assessment". W Abu Dhabi International Petroleum Exhibition & Conference. SPE, 2021. http://dx.doi.org/10.2118/208093-ms.
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Abstract It is the responsibility of oil and gas operators to recycle or dispose of drilling cuttings in a safe and environmentally friendly manner. Environmental regulations are very strict in establishing that green operations and cutting re-injection be as clean and friendly to environment as possible despite the associated challenges and cost. It is the preferred technique by the majority of international companies. Cutting re-Injection operations include grinding down the drilling cutting to small particle sizes and mixing them with a water-based fluid (mud, water, gel) to form a slurry. The slurry is then pumped under high pressure into a disposal formation where fractures can be initiated and propagated. Existing wells can be used as appropriate by targeting watered-out formations far from hydrocarbon- bearing zones; sometimes operators drill new wells purely for cutting reinjection purposes. The main sources of uncertainty include reservoir heterogeneity, permeability, pore throat size and fluid leakoff rates into the formation. The optimum scenario is to pump the cutting re-injection slurry into a very high permeability formation where screening out, plugging or well packing is unlikely, assuming solids are suspended and are completely lost into the formation. This scenario can only be feasible if the formation pore throat size is much larger than the solid size. This paper presents how to conduct risk assessments for all possible scenarios considering all sources of uncertainties. The paper also shows that under some circumstances it is better to pump the cutting slurry into a very tight formation, such as shale (closed system), than a permeable formation with a high degree of uncertainty where screenout potential risk is most likely.
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Singh, Aswani Kumar, i Varun Sharma. "Comparative Life Cycle Assessment of Various Grinding Strategies for Nickel Base Superalloys". W ASME 2021 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/imece2021-73073.
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Abstract During the grinding of advanced materials, several problems such as the generation of high temperatures, more energy consumption, excessive utilization of cutting fluids, and emissions of various harmful gases have been encountered, resulting in negative impacts on the environment. In order to mitigate such problems, this study focuses on the sustainability of the grinding process amalgamated with the introduction of ultrasonic vibration. The effect of ultrasonic vibration has been incorporated in grinding along with optimal machining parameters. Ionic Liquid (ILs) with vegetable oil has been used as a cutting fluid, which is categorized as a green solvent. Ionic Liquids (ILs) have been proved as a favourable sustainable alternative additive in the base oil to obtain the desired cutting fluid performance. A comparative study has been conducted for various grinding strategies to assess their environmental impacts using Life Cycle Assessment (LCA). Initially, Conventional Grinding (CG) and Ultrasonic Assisted Grinding (UAG) have been attempted. In the subsequent attempt, ultrasonically atomized fluid has been used for the CG and UAG processes. The SimaPro LCA software has been used to quantify the environmental impacts associated with these processes. The inputs for the LCA inventory are consisted of material consumption, energy consumption, and cutting fluid consumption. In this study, the ReCiPe 2016 V 1.04 midpoint and endpoint module has been used for carrying out the impact assessment. The results of the LCA impact assessment showed that the ultrasonic-assisted grinding performed using ultrasonically atomized cutting fluid exhibited the least adverse effects on the environment as compared to other mentioned counterparts. The cutting fluid and power consumption has been found significant contributor for the environment. The results obtained from LCA analysis can be utilized as a basis for sustainability assessment framework in the grinding of advanced materials.
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Zhong, K. M., D. N. Su i X. Li. "Green Manufacturing: Pump Free Hydraulic Drive Clamping Device With Zero Energy Consumption in the Cutting Process". W ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-66988.
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This paper introduces a pump free hydraulic drive clamping technique with zero energy consumption in the cutting process, the principle of which is to clamp the workpiece by an over-critical self-locking force-amplifying toggle mechanism which is driven by the significant displacement which is about one hundred times of the micro-displacement of giant magnetostrictive materials. The amplified displacement is the effect of the stroke-amplifying device based on area effect of Pascal theory. This new clamping technique of new concept not only features very simple structure and fast responsiveness in clamping process, but also has the following environment-friendly characteristics: (1) The clamping is significantly energy saving without energy consumption in the cutting process as well as safe and reliable due to the self-locking function of the over-critical force-amplifying toggle mechanism. (2) The noise and other pollutions generated by oil fluid leakage and volatilization are negligible because no hydraulic pump and open oil tank are used.
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Gomez-Soriano, Josep, Pradeep Sapkota, Sameera Wijeyakulasuriya, Matteo D'Elia, Daniel Probst, Veeraraghavan Viswanathan, Miguel Olcina-Girona i Ricardo Novella. "Numerical Modeling of Hydrogen Combustion Using Preferential Species Diffusion, Detailed Chemistry and Adaptive Mesh Refinement in Internal Combustion Engines". W 16th International Conference on Engines & Vehicles. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2023. http://dx.doi.org/10.4271/2023-24-0062.
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<div class="section abstract"><div class="htmlview paragraph">Mitigating human-made climate change means cutting greenhouse gas (GHG) emissions, especially carbon dioxide (CO<sub>2</sub>), which causes climate change. One approach to achieving this is to move to a carbon-free economy where carbon emissions are offset by carbon removal or sequestration. Transportation is a significant contributor to CO<sub>2</sub> emissions, so finding renewable alternatives to fossil fuels is crucial. Green hydrogen-fueled engines can reduce the carbon footprint of transportation and help achieve a carbon-free economy. However, hydrogen combustion is challenging in an internal combustion engine due to flame instabilities, pre-ignition, and backfire. Numerical modeling of hydrogen combustion is necessary to optimize engine performance and reduce emissions. In this work, a numerical methodology is proposed to model lean hydrogen combustion in a turbocharged port fuel injection (PFI) spark-ignition (SI) engine for automotive applications. The numerical method is based on 3D Computational Fluid Dynamics (CFD) simulations where Hydrogen injection is modeled using a mass flow boundary condition in the intake port, preferential species diffusion is used to model fuel-air mixing, and a 12 species, 37 reactions reduced chemical kinetics mechanism is used to model combustion with a detailed chemistry solver. Results shows good validation against measured multiple cycle cylinder pressure data for several operating conditions including varying load and equivalence ratios. The conventional methodology to simulate multiple engine cycles consecutively can be time consuming, hence, this paper evaluates the concurrent perturbation method which allows for simulating multiple cycles simultaneously in significantly less wall clock time.</div></div>
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Li, Kuan-Ming, Yang-Ming Hu, Zhong-Yi Yang, Ming-Yuan Chen i Fu-Chuan Hsu. "Effect of Machining Parameters on Surface Roughness in Vibration-Assisted Grinding". W ASME 2011 International Manufacturing Science and Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/msec2011-50143.
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Dry machining is considered as a green manufacturing process because the use of cutting fluids has concerns about environmental contamination and health hazards. However, in grinding, the use of cutting fluids is a common strategy to improve the cutting performance and the product surface finish due to the transportation of heat away from the cutting zone. Vibration-assisted machining is a novel technology which is an efficient technique for high quality surface finish in dry cutting. The purpose of this paper is to investigate the feasibility of vibration-assisted grinding of SKD61 steels, where the amplitude about 1 μm with a frequency about 10 KHz is applied. This study compares the machined surface finish in vibration-assisted grinding to that in conventional machining based on experimental measurements. The effects of the grinding and vibrating conditions on the ground surface finish are studied. A near mirror surface (Ra = 0.05 μm) is achieved at the vibration frequency of 11.4 KHz in this paper. It is also found that the best surface finish in vibration-assisted grinding is affected both by the feed and the vibration frequencies. The experimental results show that proper combination of grinding and vibration parameters should be carefully chosen to prevent instability in grinding.
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Zhong, Hanyi, Xiangzheng Kong, Zhengsong Qiu, Weian Huang, Xianbin Zhang i Chong Zhao. "Effect of Nano Carbon Spheres on the Properties of Oil-Based Drilling Fluids under High Temperature Conditions". W International Petroleum Technology Conference. IPTC, 2021. http://dx.doi.org/10.2523/iptc-21404-ms.
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Abstract Owing to superior temperature stability in comparison with water-based drilling fluids, oil or synthetic-based drilling fluids are generally preferred for high temperature and high pressure (HTHP) formations. However, the thermal degradation of emulsifiers and polymeric components under HTHP conditions that results in loss of rheological and filtration control, barite sag or even fluid phase separation also occurs. It is a challenge to sustain these properties stable under such harsh condition. Since nanoparticles have potential to provide better thermal stability, improved filtration loss as well as emulsion stability, the aim of this study is to investigate the effect of nano carbon spheres on the properties of oil-based drilling fluids under high temperature conditions. The nano carbon spheres were synthesized with the hydrothermal reaction of glucose. The influence of nano carbon spheres on the rheological, filtration, emulsion stability, settlement stability, as well as lubricity of a typical mineral oil-based drilling fluid with oil to water ratio of 80:20 was investigated before and after thermal aging at 180 and 200°C, respectively. The structure characterization showed that the uniform hard nano carbon spheres exhibited intermediate wettability. Laboratory performance test indicated that, for the oil-based drilling fluid, the addition of nano carbon spheres improved the rheological properties in terms of yield point and the ratio of yield point to plastic viscosity, which is beneficial for transporting of drilling cuttings. After thermal aging at 200 °C, the filtration loss volume was reduced as high as 70%, and desirable filter cake quality was obtained by incorporation of 1.0 wt% spheres, meanwhile the electrical stability was improved both before and after thermal aging. Furthermore, the fluid formulated with the nano carbon spheres generated better barite sag control. The polarizing microscope observation showed that the nano carbon spheres accumulated at the water-oil interface and formed a steric barrier which probably explained the reason of the above enhanced performance. The green synthetic routes and environmental friendly characteristics of the nano carbon spheres, in combination with the excellent properties suggested that the nano carbon spheres hold potential as multi-functional additives for formulating oil-based drilling fluids for HTHP drilling operations.