Дисертації з теми "Metal working fluid"
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Palkar, Ashish Yudhishthir Harris Daniel K. "An experimental investigation of liquid metal MHPs." Auburn, Ala., 2007. http://repo.lib.auburn.edu/2007%20Fall%20Theses/Palkar_Ashish_26.pdf.
Повний текст джерелаMedaska, Michael Kenneth. "The measurement of temperatures and forces in a turning operation with cutting fluid." Thesis, Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/15983.
Повний текст джерелаGlasse, Benjamin [Verfasser]. "Monitoring of Metal Working Fluid Emulsion Quality by in-process Light Spectroscopy / Benjamin Glasse." Berlin : epubli GmbH, 2015. http://d-nb.info/1074331206/34.
Повний текст джерелаLivelli, Mark Andrew. "Providing flow parameters for approximate die design models and the improvement and verification of those models using CFD analysis /." Online version of thesis, 2010. http://hdl.handle.net/1850/12222.
Повний текст джерелаChen, Zhong. "Cutting fluid aerosol generation and dissipation in machining process : analysis for environmental consciousness." Diss., Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/17929.
Повний текст джерелаGast, Christopher van der. "Microbial dynamics of metal-working fluids." Thesis, University of Oxford, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365323.
Повний текст джерелаPrince, Edmund Lee. "Fungal biodeterioration of synthetic metal working fluids." Thesis, University of Central Lancashire, 1988. http://clok.uclan.ac.uk/20019/.
Повний текст джерелаBurton, Clare. "Respiratory disease in workers exposed to metal working fluids." Thesis, University of Sheffield, 2015. http://etheses.whiterose.ac.uk/8269/.
Повний текст джерелаGRESSEL, MICHAEL GERARD. "COMPARISON OF MIST GENERATION OF FLOOD AND MIST APPLICATION OF METAL WORKING FLUIDS DURING METAL CUTTING." University of Cincinnati / OhioLINK, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=ucin990120958.
Повний текст джерелаBuers, Katy Louise Mary. "A treatment process for the degradation of metal-working fluids using mixed microbial cultures." Thesis, University of Kent, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.242930.
Повний текст джерелаSripathi, Prajwal Swamy Payton Lewis Nathaniel. "Investigation into the effects of tool geometry and metal working fluids on tool forces and tool surfaces during orthogonal tube turning of aluminum 6061 alloy." Auburn, Ala., 2009. http://hdl.handle.net/10415/1963.
Повний текст джерелаGonçalves, Neto Luiz Maurício [UNESP]. "Aplicação de fluido de corte em quantidades reduzidas para usinagem do aço SAE 52100 no processo de retificação centerless de passagem." Universidade Estadual Paulista (UNESP), 2013. http://hdl.handle.net/11449/106658.
Повний текст джерелаA presente tese propõe dar uma contribuição para o estudo de aplicação de fluido de corte no processo de retificação centerless de passagem, comparando os efeitos causados em termos de integridade da peça retificada entre a técnica convencional e a técnica aprimorada desenvolvida para o uso racional dos fluidos de corte. As condições testadas foram as seguintes: retificação centerless de passagem utilizando rebolo de corte convencional (C120TB24), três condições de lubrirefrigeração, bocal convencional (BC), bocal multitubular utilizando emulsão (BME) e bocal multitubular utilizando simultaneamente emulsão e ar comprimido (BMEA). Vazão do ar comprimido 170 L/min, vazões da emulsão: 10 L/min, 20 L/min, 30 L/min e 40 L/min e remoção de material de 0,03 mm e 0,10 mm. As variáveis de saída estudadas foram a rugosidade da superfície retificada, o desvio de circularidade e a tensão residual. Além disso, foram realizadas análise metalográfica, análise por partículas magnéticas e ataque químico com ácido nítrico da superfície retificada a fim de identificar a ocorrência de danos térmicos. Em relação às três técnicas de aplicação de fluido de corte utilizados (BC, BME e BMEA) no processo de retificação centerless passagem, em geral, observou-se um melhor desempenho com a utilização do novo conceito de bocal multitubular desenvolvido. As melhores condições de retificação foram observadas utilizando o BMEA para as vazões de 30 L/min e 40 L/min e com o BME para vazão de 30 L/min, removendo 0,03 mm de material. Para essas condições o processo foi capaz de garantir a integridade das peças, pois não apresentam danos térmicos às superfícies retificadas e mantiveram-se os valores dos desvios de circularidade e rugosidade superficial recomendados para o processo de retificação. O método convencional (BC)...
This work aims to contribute to the study and application of cutting fluid in the process of through-feed centerless grinding, comparing the effects in terms of workpiece integrity between the conventional technique and the improved technique developed for the rational use of cutting fluids. The test conditions were as follows: through-feed centerless grinding using silicon carbide resinoid grinding wheel (C120 TB24), three conditions of lubri-refrigeration, conventional nozzle (BC), multi-tube nozzle with emulsion (BME) and multitube nozzle with emulsion and compressed air simultaneously (BMEA). Compressed air flow rate 170 L/min, emulsion flow rate: 10 L/min, 20 L/min, 30 L/min, 40 L / min and material removal from 0,03 mm to 0,10mm. The output variables studied were the roughness of the ground surface, roundness deviation and residual stress. Additionally, metallographic analysis were performed as well as chemical attack with nitric acid on the ground surface in oder to identify the occurrence of thermal damage. Regarding the three techniques of cutting fluid application (BC, BME and BMEA0 in the process of through-feed centerless grinding, in general we observed a better performance when using the new concept of developed multi-tube nozzle. The best grinding conditions were observed using BMEA for the flow ratesn of 30 L/min and 40 L/min and with BME for the rate of 30 L / min, removing 0,03 mm of material. Fo these conditions the process was able to ensure workpiece integrity, since there were not thermal damage to the surface that were ground and the deviation values of roundness and surface roughness recommended for the grinding process were kept. The conventional method (BC) showed thermal damage in the layer that was ground for all conditions tested and the residual stress values of the ground... (Complete abstract click electronic access below)
Gonçalves, Neto Luiz Maurício. "Aplicação de fluido de corte em quantidades reduzidas para usinagem do aço SAE 52100 no processo de retificação centerless de passagem /." Bauru, 2013. http://hdl.handle.net/11449/106658.
Повний текст джерелаBanca: Sandro Donnini Mancini
Banca: Rosemar Batista da Silva
Banca: Amauri Hassui
Banca: Manoel Cleber de Sampaio Alves
O Programa de Pós Graduação em Ciência e Tecnologia de Materiais, PostMat, tem caráter institucional e integra as atividades de pesquisa em materiais de diversos campi
Resumo: A presente tese propõe dar uma contribuição para o estudo de aplicação de fluido de corte no processo de retificação centerless de passagem, comparando os efeitos causados em termos de integridade da peça retificada entre a técnica convencional e a técnica aprimorada desenvolvida para o uso racional dos fluidos de corte. As condições testadas foram as seguintes: retificação centerless de passagem utilizando rebolo de corte convencional (C120TB24), três condições de lubrirefrigeração, bocal convencional (BC), bocal multitubular utilizando emulsão (BME) e bocal multitubular utilizando simultaneamente emulsão e ar comprimido (BMEA). Vazão do ar comprimido 170 L/min, vazões da emulsão: 10 L/min, 20 L/min, 30 L/min e 40 L/min e remoção de material de 0,03 mm e 0,10 mm. As variáveis de saída estudadas foram a rugosidade da superfície retificada, o desvio de circularidade e a tensão residual. Além disso, foram realizadas análise metalográfica, análise por partículas magnéticas e ataque químico com ácido nítrico da superfície retificada a fim de identificar a ocorrência de danos térmicos. Em relação às três técnicas de aplicação de fluido de corte utilizados (BC, BME e BMEA) no processo de retificação centerless passagem, em geral, observou-se um melhor desempenho com a utilização do novo conceito de bocal multitubular desenvolvido. As melhores condições de retificação foram observadas utilizando o BMEA para as vazões de 30 L/min e 40 L/min e com o BME para vazão de 30 L/min, removendo 0,03 mm de material. Para essas condições o processo foi capaz de garantir a integridade das peças, pois não apresentam danos térmicos às superfícies retificadas e mantiveram-se os valores dos desvios de circularidade e rugosidade superficial recomendados para o processo de retificação. O método convencional (BC)... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: This work aims to contribute to the study and application of cutting fluid in the process of through-feed centerless grinding, comparing the effects in terms of workpiece integrity between the conventional technique and the improved technique developed for the rational use of cutting fluids. The test conditions were as follows: through-feed centerless grinding using silicon carbide resinoid grinding wheel (C120 TB24), three conditions of lubri-refrigeration, conventional nozzle (BC), multi-tube nozzle with emulsion (BME) and multitube nozzle with emulsion and compressed air simultaneously (BMEA). Compressed air flow rate 170 L/min, emulsion flow rate: 10 L/min, 20 L/min, 30 L/min, 40 L / min and material removal from 0,03 mm to 0,10mm. The output variables studied were the roughness of the ground surface, roundness deviation and residual stress. Additionally, metallographic analysis were performed as well as chemical attack with nitric acid on the ground surface in oder to identify the occurrence of thermal damage. Regarding the three techniques of cutting fluid application (BC, BME and BMEA0 in the process of through-feed centerless grinding, in general we observed a better performance when using the new concept of developed multi-tube nozzle. The best grinding conditions were observed using BMEA for the flow ratesn of 30 L/min and 40 L/min and with BME for the rate of 30 L / min, removing 0,03 mm of material. Fo these conditions the process was able to ensure workpiece integrity, since there were not thermal damage to the surface that were ground and the deviation values of roundness and surface roughness recommended for the grinding process were kept. The conventional method (BC) showed thermal damage in the layer that was ground for all conditions tested and the residual stress values of the ground... (Complete abstract click electronic access below)
Doutor
Sá, Pâmela Nunes. "Controle de bactérias presentes em fluido de corte utilizando biocidas naturais." Universidade Tecnológica Federal do Paraná, 2017. http://repositorio.utfpr.edu.br/jspui/handle/1/2269.
Повний текст джерелаFluidos de corte são utilizados para auxiliar no processo de usinagem, tendo por finalidade a refrigeração. Além disso, promove a lubrificação, a diminuição do atrito em relação à peça usinada e a ferramenta de corte, aumentando assim a eficiência do trabalho das fábricas. No sistema de usinagem, pode ocorrer o crescimento de microrganismos, uma vez que estes utilizam o fluido de corte como fonte de alimento, reduzindo assim a vida útil dos fluidos, proporcionando perdas econômicas e causando danos à saúde do operador da máquina. Para minimizar a presença de microrganismos, são utilizados produtos químicos denominados biocidas, que em altas concentrações pode causar danos à saúde. Dentro desse panorama, o objetivo desta pesquisa foi avaliar a eficiência dos óleos essenciais de Ocimum gratissimum (alfavacão), Cymbopogon winterianus (citronela) Syzygium aromaticum (cravo) e Carapa guianensis (andiroba) como agentes de controle do crescimento de bactérias em substituição ao biocida no sistema de usinagem. Inicialmente, foram realizadas coletas de fluido de corte em uma indústria automobilística para quantificar, isolar e caracterizar as bactérias (heterotróficas e potencialmente patogênicas) presentes no fluido de corte. Na sequência, as bactérias isoladas foram testadas quanto a susceptibilidade às diferentes concentrações dos óleos essenciais. O estudo procurou definir a concentração mínima inibitória (CMI) e antibiograma para avaliar a resistência a antibióticos das bactérias isoladas. Realizou-se, então, o teste de tempo de contato dos óleos essenciais e de encapsulamento do óleo essencial de citronela por meio da técnica de gelificação iônica, que consistiu em simular a situação do reservatório (i) com óleo encapsulado, (ii) com óleo misturado diretamente ao fluido de corte (iii) com fluido de corte contaminado, com o objetivo de avaliar a melhor forma de aplicação dos óleos no sistema de usinagem. Dentre os resultados, obteve-se 1,63x107 e 2,2x107 UFC/mL de bactérias heterotróficas e 3,5x105 e 2x106 UFC/mL de bactérias potencialmente patogênicas, na primeira e segunda coleta de fluidos, respectivamente. Foram isolados seis grupos de bactérias correspondentes às seguintes espécies: Staphylococcus aureus, Enterobacter cloacae, Escherichia coli, Enterococcus faecalis, Proteus mirabilis e Acinetobacter spp. A bactéria que apresentou maior resistência aos antibióticos testados foi a Acinetobacter spp As que apresentaram maior sensibilidade foram a Enterobacter cloacae (A2), Escherichia coli (A3) e Proteus mirabilis (A6). O óleo de Syzygium aromaticum teve o maior halo formado na menor concentração testada (0,25%) - 11,07 mm, seguido por Ocimum gratissimum, com halo de 11,0 mm, e Cymbopogon winterianus ,10,7 mm. No teste de tempo de contato, o menor tempo de redução de crescimento ocorreu em 1 minuto para Ocimum gratissimum; 5 minutos para Syzygium aromaticum e 10 minutos para Cymbopogon nardus. O teste de encapsulamento foi realizado com o óleo de Cymbopogon nardus, obtendo-se redução significativa nas duas formas de aplicação do óleo essencial.
Cutting fluids are used to aid in the machining process, with the purpose of cooling, besides promoting lubrication, reducing friction in relation to the machined part and the cutting tool, thus increasing the efficiency of the work of the factories.In the machining system, the growth of microorganisms can occur, since they use the cutting fluid as food source, thus reducing the useful life of the fluids and providing economic losses and causing damages to the health of the worker.To minimize the presence of microorganisms is used a chemical called biocide, which in high concentrations can cause health damage.The objective of this research was to evaluate the efficiency of the essential oils of Ocimum gratissimum (Alfavaca), Cymbopogon nardus (Citronella) Syzygium aromaticum (Clove) and Carapa guianensis (andiroba) as a control agent for the growth of bacteria in replacement of the biocide in the machining system.Initially, cutting fluid samples were collected in an automobile industry to quantify, isolate and characterize the bacteria (heterotrophic and potentially pathogenic) present in the cutting fluid.Following the isolated bacteria were tested for susceptibility to the different concentrations of the oils to define the minimum inhibitory concentration (MIC) and antibiogram to evaluate the resistance of the bacteria isolated to antibiotics.The contact time test of the essential oils and encapsulation of the essential oil of Citronella was carried out by means of the ionic gelation technique, which consisted of the simulation of reservoirs containing cut fluid contaminated with encapsulated oil, with oil mixed directly with the oil. Cutting fluid and reservoir containing only contaminated cutting fluid, in order to evaluate the best way of applying the oils in the machining system.Among the results obtained were 1.63x107 and 2.2x107 CFU / mL heterotrophic bacteria and 3.5x105 and 2x106 CFU / mL of potentially pathogenic bacteria in the first and second fluids collection, respectively. Six groups of bacteria were isolated, corresponding to the following species: Staphylococcus aureus, Enterobacter cloacae, Escherichia coli, Enterococcus faecalis, Proteus mirabilis and Acinetobacter spp.The bacterium that presented the highest resistance to the antibiotics tested was Acinetobacter spp and the ones with the highest sensitivity were Enterobacter cloacae (A2), Escherichia coli (A3) and Proteus mirabilis (A6). The oil of Syzygium aromaticum had the largest halo formed by the lowest concentration tested (0.25%) -11.07 mm, followed by Ocimum gratissimum with halo of 11 mm and Cymbopogon nardus 10.7 mm. In the test of contact time the shortest time reduction occurred in 1 minute for Ocimum gratissimum, 5 minutes for Syzygium aromaticum and 10 minutes Cymbopogon nardus for 4 of 6 bacterial isolates. The encapsulation test was performed with the Cymbopogon nardus oil, obtaining a significant reduction in the two forms of essential oil application.
Larnaudie, Guy. "Etude thermodynamique de fluides de travail pour pompes à chaleur fonctionnant à très hautes températures. Utilisation du mélange mercure-sodium." Rouen, 1996. http://www.theses.fr/1996ROUES010.
Повний текст джерелаNakagawa, Danielle Hiromi. "Investigação da degradação do óleo presente em fluido de corte por bactérias e fungos." Universidade Tecnológica Federal do Paraná, 2015. http://repositorio.utfpr.edu.br/jspui/handle/1/2250.
Повний текст джерелаThe cutting fluid is widely used in metal machining process, but it is vulnerable to microbiological contamination contributing to loss in quality causing the decrease of its useful lifetime. Considering that many papers study the microbiological contamination of the fluid, but few associated to chemical changes of the oil constituent of the fluid, the objective of this study was to monitor the growth of microorganisms in two cutting fluids bases each containing a type of oil (mineral and vegetable) under two operating conditions of the machine tool: normal process and process using a electrophysical catalyst which directs the flow of ozone to the cutting fluid, to evaluate the chemical changes of the fluid oil extracted and the capability of microorganisms to degrade the cutting fluid and the oil extracted. Counting and isolation of bacteria and fungi were performed on cutting fluids used in machine tool throughout 166 hours of operation of the machine. For analysis of oil quality, it was extracted oil of the cutting fluid and posteriorly it was measured the acidity index (mineral and vegetable oils), iodine and saponification of vegetable oil. For the hydrocarbon degradation test it was used 2,6-dichlorophenol-indophenol as degradation indicator, being carbon sources: cutting fluid and oil extracted from the cutting fluid at different times of use of the machine. The results demonstrated that the amount of bacteria and fungi present in the mineral cutting fluid operated on the machine for 126 hours was in the order of 105 to 102 CFU/ml, respectively, and using the catalyst (40 hours of machine operation) it was 106 and 101 CFU/mL, respectively. The amount of bacteria and fungi from vegetable cutting fluid were 102 CFU/ml and after the application of the catalyst they were 105 and 103 CFU/ml, respectively. In the degradation tests of hydrocarbon, it was found that 42% of bacteria and 84% of the fungi were able to degrade the mineral cutting fluid or extracted oil on 5 days of analysis. 54% of bacteria and 74% of the fungi found on vegetable cutting fluid were able to degrade the cutting fluid or extracted oil. It can be concluded that there were chemical changes in the oils used to prepare cutting fluid and that microorganisms can be directly influenced in oil degradation, since the increased amount of microorganisms followed the oil degradation.
Langbein, Jennifer Edith [Verfasser], Ulf [Akademischer Betreuer] Stahl, Ulf [Gutachter] Stahl, Peter [Gutachter] Neubauer, Thomas [Gutachter] Neu, and Eckart [Gutachter] Uhlmann. "Characterization and identification of microbial contaminations and biofilm formation in metal-working-fluids / Jennifer Edith Langbein ; Gutachter: Ulf Stahl, Peter Neubauer, Thomas Neu, Eckart Uhlmann ; Betreuer: Ulf Stahl." Berlin : Technische Universität Berlin, 2016. http://d-nb.info/1156346983/34.
Повний текст джерелаLee, Seung-Mok. "Biodegradation of metalworking fluids." 1986. http://hdl.handle.net/2097/22111.
Повний текст джерелаMeister, Bernhard Erwin. "The identification of desirable parameters for aluminium cutting using various cutting fluids and limited volume lubrication." Diss., 2003. http://hdl.handle.net/2263/25967.
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