Orientador: Eduardo Carlos Bianchi / Banca: Carlos Alberto Soufen / Banca: Carlos Elias da Silva Junior / Resumo: A etapa de dressagem é integrante ao processo de retificação, sendo esta uma operação de afiliação, ou seja, a retificação do rebolo, que tem como principal finalidade a remoção dos grãos abrasivos desgastados e garantir a concentricidade do rebolo. Nesse contexto, essa operação adquire uma grande importância no desempenho do rebolo e na qualidade desse processo. Este trabalho propõe a análise do comportamento do desgaste e a vida útil do dressador de ponta única, etapa esta que é muito comum em rebolos convencionais onde, periodicamente, a face de trabalho deve ser restaurada. Neste trabalho foram avaliados três tipos de diamantes, sendo um sintético e dois naturais, onde os dados coletados dos ensaios foram registrados e arquivados para avaliação dos valores iniciais e sequenciais das etapas estipuladas para retirada de imagem, sendo tabulados e posteriormente analisados entre a relação do desgaste e tempo de vida útil no processo. Observou-se após a análise dos dados obtidos, uma grande variação entre as áreas desgastadas para os modelos de diamantes naturais do tipo Brasil Extra e Mato Grosso. Já o diamante tipo CVD Sintético Nacional apresentou um valor de área desgastada próxima ao Brasil Extra. No decorrer do processo, os diamantes naturais apresntaram grande variação em sua dureza e estrutura, ocorrendo pequenos lançamentos quando comparado ao sintético, no qual apresentou uma dureza mais consistente mesmo às altas temperaturas e sem sofrer lascamento durante os ensaios. Com base nos dados obtidos neste estudo, o diamante tipo CVD Sintético Nacional apresentou uma grande vantagem em sua durabilidade em relação aos outros dois diamantes testados, obtendo um desgaste equivalente ao tipo Brasil Extra. O tipo Mato Grosso apresentou uma qualidade muito inferior em todos os aspectos em relação aos demais / Abstract: The dressing is an integral step in the grinding process, which is an operation of grinding, in other words, the rectification of the wheel, which has as main purpose the removal of worn abrasive grains and ensure concentricity of the wheel. In this context, this operation becomes more important in the performance of the wheel, and the quality of this process. These tests suggest the analysis of wear behavior and the life of the single point dresser, this step is very common in conventional grinding wheels where periodically the working face must be restored. In this work three types of diamonds are evaluated, one synthetic and two natural, where the data collected from the test will be recorded and achived for evaluation of initial and sequential values of the levels proposed for the removal of image being tabulated and further analyzed the relationship between the wear and lifetime of the worn areas for models of natural diamonds of type Extra Brazil and Mato Grosso. Already the National CVD Synthetic type showed a value of close to Brazil Extra abraded area. To the process, natural diamonds showed great variation in their structure and hardness, chipping occurring small when compared to the synthetic which presented a more consistent hardness at high temperatures without suffering and chipping during rehearsals. Based on the data obtained in this study, the National CVD Synthetic Diamond type showed a great advantage in durability compared to the other two diamonds tested, obtaining an equivalent type Brazil Extra wear. The Mato Grosso type showed a much lower quality in all aspects compared to the other / Mestre

Orientador: Patrícia Petromilli Nordi Sasso Garcia / Banca: Maria Cristina Borsatto / Banca: Welingtom Dinelli / Resumo: O objetivo deste estudo foi avaliar o efeito do acabamento e polimento na estabilidade de cor e na rugosidade superficial da resina composta Filtek Supreme XT em função de diferentes soluções fluoretadas. Para isso foram confeccionados corpos-de-prova (n= 140) por meio de uma matriz de aço inoxidável hemiseccionada com quatro orifícios circulares de 10 mm de diâmetro e 2 mm de espessura. A resina composta foi inserida na matriz num único incremento e fotoativada pelo aparelho de luz halógena Curing Light XL 3000 (3M/ESPE) por 40 segundos. Metade da amostra foi submetida a procedimentos de acabamento e polimento com discos de lixa Super-Snap® em ordem decrescente de granulação. Os grupos experimentais foram divididos de acordo com a presença ou ausência de acabamento e polimento e diferentes meios de imersão (saliva artificial, solução de fluoreto de sódio a 0,05%- manipulado, Fluordent Reach, Oral B, Fluorgard). Os espécimes permaneceram imersos em saliva artificial por 24 horas e foram submetidos à análise da cor no espectrofotômetro de colorimetria (Color guide 45/0, PCB 6807 BYK-Gardner GmbH Gerestsried, Alemanha) pelo sistema CIELab e à avaliação da rugosidade superficial (Ra) pelo rugosímetro portátil (Mitutoyo surftest SJ-401, Mitutoyo Corporation, Japão). A partir deste período, foram imersos nas diferentes soluções por 1 minuto ao dia durante 60 dias. Nos intervalos entre as imersões foram mantidos em saliva artificial a 37 _ 1 0C. As leituras da alteração de cor foram realizadas após 24 e 48 horas, 7, 14, 21, 30 e 60 dias do início da imersão e a da rugosidade superficial após 60 dias. Atendidos os pressupostos de normalidade e homocedasticidade, realizou-se Análise de Variância a dois fatores e teste de Tukey para comparações múltiplas, ambos com nível de significância de 5%. Para comparação das médias de rugosidade... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: The aim of this study was to evaluate the effect of finishing and polishing procedures on the color stability and roughness of the Filtek Supreme XT resin composite surface submitted to different fluoride solutions. Samples were made (n= 140) in a hemi sectioned stainless steel mold with four 10-mm diameter and 2mm thick circular orifices. The composite resin was inserted in a single increment and light-cured with a halogen light curing unit (Curing Light XL 3000, 3M/ESPE) for 40 seconds. Half of each sample was submitted to finishing and polishing procedures with Super-Snap® grit disks in a decreasing order of granulation. Experimental groups were divided according to the presence or absence of finishing and polishing procedure and also to the different immersion media they were submitted to (artificial saliva, a manipulated 0, 05% sodium fluoride solution, Fluordent Reach, Oral B, Fluorgard). Specimens were kept in artificial saliva for 24 hours and submitted to color analysis in a colorimetric spectrophotometer (Color guide 45/0, PCB 6807 BYK-Gardner GmbH Gerestsried, Germany) by the CIELab system and to superficial roughness (Ra) evaluation by a portable rugosimeter (Mitutoyo surftest SJ-401, Mitutoyo Corporation, Japan). From this period, specimens were immersed in the different solutions for 1 minute per day, during 60 days. In periods between immersions, they were kept in artificial saliva at 37 _ 1 0C. Color alteration evaluations were performed after 24 and 48 hours, 7, 14, 21, 30 e 60 days and superficial roughness after 60 days from the beginning of immersions. After normality and homoscedasticity presumption had been confirmed, the two-way Analysis of Variance and Tukey's test for multiple comparisons were realized, both with a 5% significance level. For comparison of roughness means in baseline and in the 60 days... (Complete abstract click electronic access below) / Mestre

O Brasil ocupa uma posição de destaque no cenário mundial da produção e exportação de rochas ornamentais devido a sua diversidade litológica e por abrigar todas as fases da cadeia produtiva, desde a lavra até o esquadrejamento de ladrilhos. No entanto, apesar da grande importância que este setor representa para a balança comercial mineral do país, muitos mecanismos físicos de seus processos industriais ainda não são corretamente entendidos, sendo realizados na maioria das vezes de forma empírica. A etapa de polimento das rochas ornamentais, que pode ser descrita como um processo em que o desgaste provocado por ferramentas abrasivas elimina as superfícies rugosas herdadas na etapa da serragem, ainda é um destes processos cujas variáveis envolvidas permanecem escassas de estudos. Na tentativa de torná-lo menos subjetivo, o Grupo de Tecnologia de Rochas (GTR) da Área de Pós-graduação em Geotecnia da EESC/USP, tem desenvolvido pesquisas abordando o enfoque da tribologia ao polimento, porém não esgotando todos os parâmetros envolvidos. Dando continuidade a estes estudos, a presente pesquisa abrange a simulação de polimento de 2 rochas \"graníticas\" utilizando-se dois tipos de abrasivos: os magnesianos, de uso mais tradicional, e o resinóide, um dos mais modernos utilizados atualmente. Foram usadas 9 combinações distintas, entre velocidade de rotação (200, 400 e 600 rpm), tempo (2, 4 e 6 minutos) para carga de 1 bar. Dentre as amostras submetidas ao processo, as com textura grossa e inequigranular mostraram certa limitação quanto à representatividade do equipamento SPR no desgaste abrasivo, não refletindo (necessariamente) a realidade do polimento industrial de granitos com mineralogia e textura similares. No entanto, em amostras com textura fina e equigranular, com baixa resistência à abrasão Amsler, os resultados expressos pelas perdas de massa (rocha e abrasivo) mostraram melhores superfície polida e qualidade de brilho, além de maior eficiência no polimento. / Brazil occupies a leading position on the global scenario of production and export of ornamental stones due to its geological diversity and by accommodate all stages of the supply chain, from quarrying to the tiles finishing. However, despite the great importance of this sector, many physical mechanisms of its industrial processes are still not properly understood and performed most often empirically. The polishing of ornamental stones, which can be described as a process where wearing caused by abrasive tools eliminates rough surfaces coming from the sawing stage, it is still one of the processes where the variables involved remain in scarce studies. In an attempt to become this process less subjective, the Geotechnical Engineering postgraduation department from the University of São Paulo (USP) at São Carlos School of Engineering has been developing researches approaching the focus of tribology in the polishing, but not exhausting all parameters involved. Following such studies, this research covers the polishing simulation of two granitic stones using two types of abrasives: the magnesian, more traditional, and resinoid, one of the most modern presently used. Nine different combinat ions were used between rotation speed (200, 400 and 600 rpm) and time (2, 4, and 6 minutes) to the 1 bar load. Among the samples subjected to the process, those with coarse and inequigranular texture showed some limitation to the representativeness of the SPR equipment in abrasive wearing, not necessarily reflecting the reality of industrial polishing of granites with similar mineralogy and texture. However, samples with fine and equigranular texture with low abrasive resistance, the results expressed by mass loss (stone and abrasive) showed better quality of the polished surface and gloss, besides a more efficient polishing.

Este trabalho dedica-se à caracterização das superfícies geradas durante as diferentes etapas do processo de polimento com rodas flap e buffing. O mesmo foi concebido tendo como base uma situação real de substituição de um processo de manufatura manual por um processo mecanizado. A mecanização do processo é importante, uma vez que os custos envolvidos de mão de obra e material são elevados, assim como os custos relacionados à rejeição de um componente nesta etapa de fabricação, devido ao valor já agregado ao mesmo. Devido à pouca informação disponível na literatura especializada sobre esses processos, foi constatado que a verificação dos elementos que compõem as superfícies geradas pelos processos é de fundamental importância para o entendimento dos mesmos. Com base nisso, foram estudadas as superfícies geradas durante as diferentes etapas que compõem o processo de polimento, de forma manual e mecanizada. As etapas consistem no polimento com o uso sequenciado de rodas flap com granulometria mesh P180, P240 e P320 e, por último, a etapa de buffing. Foram utilizados para a caracterização da superfície usinada: microscopia eletrônica de varredura por emissão de campo (MEV-EC), medição de rugosidade e medição de parâmetros de área superficiais (tridimensionais). Os resultados possibilitaram a identificação dos elementos que compõem a superfície, bem como a identificação das modificações da mesma durante cada etapa do processo de polimento. As medições dos parâmetros indicam diminuição da rugosidade a cada etapa do processo de polimento por rodas flap. Também sugerem que a superfície passou a apresentar picos mais agudos e vales mais rasos com a progressão do processo. Também foi possível comparar as superfícies geradas de forma manual e mecanizada. A última apresentou uma menor dispersão dos parâmetros medidos. A superfície final, gerada pelo processo de buffing, é equivalente para os processos mecânico e manual. No entanto, a medição dos parâmetros não apontou diferenças entre a superfície gerada por buffing e rodas flap 320, apesar de haver diferença visual entre ambas. Os resultados sugerem que isso esteja relacionado com a escala de atuação do processo de buffing, que atua numa escala inferior à detectável pelos métodos de medição utilizados. / This work was aimed to the characterization of surfaces generated during the different stages of the polishing process with flap wheels and buffing. The process was designed based on a real situation of replacing a manual manufacturing process by a mechanized process. The mechanization of the process is important, due the high costs involved with labor and material, as well as costs related to the rejection of a component in this manufacturing stage, due to already added value to it. Due to the limited information available in specialized literature, it was found that the verification of the elements that compose the surfaces have a fundamental importance for the understanding of these processes. Based on this, the surfaces generated during the different stages that compose the manual and mechanized polishing process were investigated. The steps consist of polishing with the use of sequenced flap wheels with mesh P180, P240 and P320, ending with the buffing process. It was used for characterization: Field Emission Scanning Microscopy (FESEM), roughness measurement and surface area measurement parameters (three-dimensional). It was possible to identify the surface details, as well as changes of the same during each step of the polishing process. The parameters measurement indicates a decrease in roughness at each stage of the flap wheels polishing process. They also suggest that the surface began to show sharper peaks and shallower valleys with the progression of the process. It was also possible to compare the surfaces generated manually and mechanically. The latter exhibited a lower dispersion of the measured parameters. The final surface, generated by the buffing process is equivalent to the mechanized and manual processes. However, measurement of the parameters showed no differences between the surfaces generated by buffing and flap wheels 320 mesh, although there are differences between them. The results suggested that this difference it is related to the buffing process operation scale, which operates on a lower scale than detectable by measuring methods used.

Doctor of Philosophy / Department of Industrial & Manufacturing Systems Engineering / Zhijian Pei / Silicon is the primary semiconductor material used to fabricate integrated circuits (ICs). The quality of integrated circuits depends directly on the quality of silicon wafers. A series of processes are required to manufacture the high-quality silicon wafers. Chemical mechanical polishing is currently used to manufacture the silicon wafers as the final material removal process to meet the ever-increasing demand for flatter wafers and lower prices. A finite element analysis has been conducted to study the effects of influencing factors (including Young's modulus and Poisson's ratio of the polishing pad, thickness of the pad, and polishing pressure) on the wafer flatness. In addition, an experimental study was carried out on the effects of process variables (including wafer rotation speed, pad rotation speed, the temperature of the cooling wafer in polishing table, polishing pressure, and the slurry flow rate) on material removal rate (MRR) in polishing of silicon wafers. The results from this study show that the polishing pressure and the pad speed are the most significant factors affecting the MRR. The polishing pad is one of the most critical factors in planarizing the wafer surface. It transports the slurry and interacts with the wafer surface. When the number of polished wafers increases, the pad is glazed and degraded and hence the polishing quality is decreased. The pad properties are changed during the process. The measuring methods for the pad properties including pad thickness monitoring, elastic properties and hardness are reviewed. Elasticity of two types of pads are measured and compared. The poor flatness problems such as tapering, edge effect, concave or convex wafer shape were investigated. Finite element models were developed to illustrate the effects of polishing pad and carrier film properties on the stress and contact pressure distribution on the wafer surface. Moreover, the material removal unevenness is studied. A grinding-based manufacturing method has been investigated experimentally to demonstrate its potential to manufacture flat silicon wafers at a lower cost. It has been demonstrated that the site flatness on the ground wafers (except for a few sites at the wafer center) could meet the stringent specifications for future silicon wafers. One of the problems is the poor flatness at the wafer center: central dimples on ground wafers. A finite element model is developed to illustrate the generation mechanisms of central dimples. Then, effects of influencing factors (including Young's modulus and Poisson's ratio of the grinding wheel segment, dimensions of the wheel segment, grinding force, and chuck shape) on the central dimple sizes are studied. Pilot experimental results are presented to substantiate the predicted results from the finite element model. This provides practical guidance to eliminate or reduce central dimples on ground wafers. The study in this thesis is to understand the mechanism of CMP and grinding of silicon wafers. Improving the processes and the quality of silicon wafers are the final goals.

Orientador: André Afif Elossais / Resumo: A constante procura por procedimentos estéticos têm levado muitos pacientes e dentistas a realizarem o clareamento dental, por se tratar de um procedimento mini-mamente invasivo e conservador. Porém o gel clareador pode resultar em alterações estruturais do esmalte e afetar negativamente esta superfície. O objetivo deste estu-do in vitro foi avaliar a rugosidade e morfologia superficial do esmalte após o proto-colo de clareamento e os diferentes tratamentos superficiais de polimento. Para is-to, quarenta e oito (48) pré-molares humanos foram selecionados e clareados com o gel Opalescence Boost PF 40% (Ultradent) de acordo com a recomendação do fa-bricante. Após os protocolos de clareamento, os espécimes foram divididos em 8 grupos (n=6) e submetidos a polimento com: G1- Enamelize™ + Lummina E - Alu-mina, G2- Diamond Polish Paste™ + Lummina E - Diamond, G3- Lummina E - Di-amond, G4- discos abrasivos Sof-Lex Pop On® ultrafino, G5- Enamelize®, G6- Lummina E - Alumina, G7- Diamond Polish Paste® e G8- disco de feltro Diamond Flex®. Os espécimes foram submetidos as análises de perfilometria e microscopia de força atômica (AFM), para avaliar a rugosidade e morfologia superficial do esmal-te respectivamente. Ambas análises foram realizadas em dente hígido (baseline), clareado e polido. Para a avaliação da rugosidade superficial do esmalte dental hu-mano foi empregado o procedimento estatístico ANOVA de medidas repetidas com correção de Greenhouse-Geisser, seguido de comparações múlti... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: Many patients have searched cosmetic procedures such as tooth bleaching once it is a minimally invasive and conservative treatment. However bleaching gel can cause enamel structural changes and negatively affect its surface. The aim of this in vitro study was to evaluate the enamel roughness and surface morphology after bleaching protocol and different surface polishing treatments. Forty-eight human premolars were bleached using 40% Opalescence Boost PF (Ultradent) according to the manufacturer's recommendations. Afterwards, the specimens were divided into 8 groups (n = 6) and polished using: G1- Enamelize™ + Lummina E - Alumina, G2- Diamond Polishing Paste™ + Lummina E - Diamond, G3- Lummina E - Diamond, G4- Sof-Lex Pop On® ultra-fine abrasive discs, G5- Enamelize®, G6- Lummina E - Alumina, G7- Diamond Polishing Paste® and G8- Diamond Flex® felt disc. The specimens were submitted to profilometry and atomic force microscopy (AFM) analy-sis to evaluate the enamel roughness and surface morphology. Both analyzes were performed on a sound (baseline), bleached and polished tooth. Surface roughness data were submitted to ANOVA and Greenhouse-Geisser correction, followed by multiple comparisons with Bonferroni correction, at 5% significance level. 40% Opalescence Boost PF bleaching gel significantly increased the enamel surface roughness (p <0.05). G1, G2, G3, G5, G6, showed statistically significant differences (p <0.05). G4, G7 and G8 did not show statistical difference (p> 0.05),... (Complete abstract click electronic access below) / Mestre

Objective: To assess the effect of finishing and polishing direction on the marginal adaptation of resin-based composite restorations. Methods: Forty human molars were collected and sectioned along their mesio-distal axis. Buccal and lingual enamel surfaces were flattened and a triangular preparation (0.87mm deep and 3mm wide) representing two 30° bevels was achieved. Specimens (n=20/per group) were randomly assigned in groups and restored with two resin-based composite materials: a nanofilled (Filtek Supreme Ultra)(FSU) and a microhybrid (Point4)(PT4) and two finishing/polishing techniques: a series of Sof-Lex discs (SL) and a sequence of diamond bur/dark-orange SL/rubber polishers (HiLuster). On each specimen, both margins were finished and polished with the same technique, one from the resin-based composite to the tooth structure (C-T) and the other from the tooth structure to the resin-based composite (T-C). Replicas were made for FeSEM observation (200X) and quantitative margin analysis was performed based on four defined marginal quality criteria. Comparisons were made between polishing directions (paired-samples t-test, Wilcoxon signed-rank test), between resin-based composites and between polishing techniques (two-sample t-test and Wilcoxon rank sum test) Results: Significant differences were found between polishing directions (p<0.05). Data showed more continuous margins, less marginal irregularities and less gaps with the polishing direction C-T than T-C except for one group (FSU/SL) with marginally significant difference in gaps (p=0.0537). Differences between the two resin-based composites and the two polishing techniques seemed to be dependent on certain combinations of resin-based composite, polishing technique and polishing direction. Conclusion: Within the limitations of this in vitro study, polishing from resin-based composite to tooth structure (C-T) leads to better marginal adaptation than polishing from tooth structure to resin-based composite (T-C).

To assess polishing of anaerobic secondary effluent and symbiotic bioremediation of primary effluent by microalgae, bench scale bubbling column reactors were operated in batch modes to test nutrients removal capacity and associated factors. Chemical oxygen demand (COD) together with oil and grease in terms of hexane extractable material (HEM) in the reactors were measured after batch cultivation tests of Chlorella Vulgaris, indicating the releasing algal metabolites were oleaginous (dissolved HEM up to 8.470 mg/L) and might hazard effluent quality. Ultrafiltration adopted as solid-liquid separation step was studied via critical flux and liquid chromatography-organic carbon detection (LC-OCD) analysis. Although nutrients removal was dominated by algal assimilation, nitrogen removal (99.6% maximum) was affected by generation time (2.49 days minimum) instead of specific nitrogen removal rate (sN, 20.72% maximum), while phosphorus removal (49.83% maximum) was related to both generation time and specific phosphorus removal rate (sP, 1.50% maximum). COD increase was affected by cell concentration (370.90 mg/L maximum), specific COD change rate (sCOD, 0.87 maximum) and shading effect. sCOD results implied algal metabolic pathway shift under nutrients stress, generally from lipid accumulation to starch accumulation when phosphorus lower than 5 mg/L, while HEM for batches with initial nitrogen of 10 mg/L implied this threshold around 8 mg/L. HEM and COD results implied algal metabolic pathway shift under nutrients stress. Anaerobic membrane bioreactor effluent polishing showed similar results to synthetic anaerobic secondary effluent with slight inhibition while 4 symbiotic bioremediation of raw municipal wastewater with microalgae and activated sludge showed competition for ammonium together with precipitation or microalgal luxury uptake of phosphorus. Critical flux was governed by algal cell concentration for ultrafiltration membrane with pore size of 30 nm, while ultrafiltration membrane rejected most biopolymers (mainly polysaccharides). Further research would focus on balancing cell growth, specific nutrients removal, and specific COD change by utilizing rotating biological contactor.

he aim of this thesis is possibilities analyse of automatization of finishing operations by producing bodies of plumbing fittings and selection it’s optimal version. The objective is project of workplace for conditions of concrete production plant and verification of return of it’s operating. A part of thesis is design of workplace and design of production machines and komplete technology of prodicing of parts in setting of production plant. Than there is partial verification of profected technology by real testing.

Orientador: Eduardo Carlos Bianchi / Coorientador: Luiz Eduardo de Angelo Sanchez / Banca: Luiz Dare Neto / Banca: Hamilton José de Mello / Banca: Alessandro Roger Rodrigues / Banca: Rodrigo Eduardo Catai / Resumo: Na indústria metal-mecânica, por ser considerado uma etapa final e de acabamento, o processo de retificação contém valor agregado alto ao produto final. Neste processo a utilização de fluidos de corte é um dos fatores responsáveis na obtenção da qualidade final do processo, porém a eles são atribuídos fatores de risco à saúde e ao meio ambiente. Diante do contexto, diversos setores da indústria, pesquisa e educação, são mobilizados a buscar novas alternativas que possam reduzir custos e que sejam menos prejudiciais ao meio ambiente e uma das alternativas já em estudo é a técnica de mínima quantidade de lubrificante (MQL), que é caracterizada pela eficiência do processo em se aplicar uma quantidade menor de fluido de corte, se comparada com o método de lubrirrefrigeração convencional. Porém, na aplicação de MQL é importante que seja observado a pouca eficiência quanto a limpeza da superfície de corte do rebolo, acarretando na obstrução dos poros do rebolo e prejudicando as arestas cortantes. Diante do exposto, o presente trabalho teve como objetivo analisar o comportamento da técnica de MQL associada à limpeza do rebolo, integrada ao sistema de ar a baixa temperatura aplicado à zona de corte, de forma a preservar os parâmetros como: lubrirrefrigeração e limpeza da zona de corte com jato de ar comprimido a baixa temperatura. Neste trabalho foram realizados estudos resultantes da retificação cilíndrica do aço ABNT 4340, e utilizando o rebolo convencional de óxido de alumínio bra... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: In the metalworking industry, for being the grinding process is considered a final stage and finishing, the grinding process has high added value to the final product, in this process the use of cutting fluids is one of the factors responsible for obtaining the final quality of the process, however they are attributed risk factors to health and the environment. In this context, several sectors of industry, research and education are mobilized to seek new alternatives that can reduce costs and that are less harmful to the environment and one of the alternatives already under study is the technique of minimum quantity lubricant (MQL), which is characterized by the efficiency of the process in applying a smaller amount of cutting fluid as compared to the conventional flood coolant method. However, in the application of the MQL it is important to observe the low efficiency of the cleaning of the cutting surface of the grinding wheel, resulting in clogging of the grinding wheel pores, damaging the sharp edges. Thereupon, the present study addresses the behavior of the MQL technique associated to the cleaning of the grinding wheel, integrated to the cold air system applied to the cutting zone, in order to preserve the parameters such as: flood coolant and cleaning of the cutting zone with air jet compressed at low temperature. In this thesis, studies were carried out resulting from the grinding of ABNT 4340 steel and using the conventional white aluminum oxide grinding wheel under the application of different lubrication and cooling conditions, where the conventional method can be compared to the MQL technique associated to cleaning at cold -10º C and -15º C. The results obtained were characterized by roughness tests, circularity deviation, diametrical wear grinding wheel, metallographic analysis, optical microscopy, microhardness and analysis of the influence of the flood coolant. Both the flood coolant metho / Doutor