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Made available in DSpace on 2021-06-25T11:12:39Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-04-01 Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Grinding is a machining process widely applied in the manufacture of products that require low tolerance and high-dimensional accuracy. One of the most critical issues in this manufacturing process is the material burn phenomenon, which can lead the part to a total failure. Therefore, monitoring burn in the grinding process is crucial to ensure a high level of quality, productivity, and repeatability of industrial processes. This article presents a new non-destructive approach for the onset location of burn in the SAE 1045 steel, aiming to develop a reliable and robust grinding monitoring system as an alternative to invasive methods. An experimental investigation was conducted by using low-cost piezoelectric diaphragms and feature extraction of the signals through Hinkley criterion. By comparing to the traditional and invasive tests such as microhardness measurements and metallographic analysis, it was concluded that the Hinkley criterion has a high effectiveness and potential to locate the onset of burn, since the error of the location was less than 4%. Department of Electrical Engineering School of Engineering São Paulo State University (UNESP) Department of Mechanical Engineering School of Engineering São Paulo State University (UNESP) Department of Electrical Engineering School of Engineering São Paulo State University (UNESP) Department of Mechanical Engineering School of Engineering São Paulo State University (UNESP) CNPq: 306435/2017-9

Made available in DSpace on 2021-06-25T12:36:10Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-02-03 Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) The high temperatures involved in the grinding process require an efficient lubri-refrigeration method. Currently, the conventional method (flood) is the most used in industries. However, this method comes up against environmental damage and the health of operators, due to high amounts of fluid injected into the cutting region. Therefore, the use of the minimum quantity lubricant (MQL) technique with a wheel cleaning jet (WCJ) proves to be a viable alternative. This work makes a comparative analysis of the MQL + WCJ system with a conventional method. In this sense, the experiments grinding the AISI 4340 steel with an aluminum oxide wheel. The lubrication and cooling of the process were done by the conventional method, pure MQL, and diluted MQL (oil-water 1:1, 1:3, 1:5) with and without cleaning (WCJ). The output parameters evaluated were surface roughness (Ra), roundness error, G-ratio, tangential cutting force, specific energy, microstructure, and cost. The surface roughness shows an increase of only 18%, with the use of the MQL technique diluted 1:5 + WCJ compared to the conventional method. Also, the implementation of the MQL technique is cheaper than the conventional method. The results show that the addition of water in MQL favors grinding, and the efficiency of MQL increases when associated with WCJ for all parameters. Sao Paulo State UniSvers Julio de Mesquita Filho, Dept Mech Engn, Bauru Campus, Bauru, SP, Brazil Fed Inst Parana, Dept Control & Ind Proc, Jacarezinho Campus, Jacarezinho, Parana, Brazil Sao Paulo State Univ Julio de Mesquita Filho, Dept Elect Engn, Bauru Campus, Bauru, SP, Brazil Sao Paulo State UniSvers Julio de Mesquita Filho, Dept Mech Engn, Bauru Campus, Bauru, SP, Brazil Sao Paulo State Univ Julio de Mesquita Filho, Dept Elect Engn, Bauru Campus, Bauru, SP, Brazil FAPESP: 2018/22661-2

Made available in DSpace on 2021-06-25T11:11:03Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-03-01 Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) The global effort in order to reduce impacts to the environment and people produces the need for new technologies as an eco-friendly alternative to replace the cutting fluids, which directly affects the grinding process. In this sense, grinding uses a large amount of cutting fluid to mitigate high temperatures and their consequences. Thus, alternatives to the cutting fluid should reduce the use of fluid combined with the maintenance of production, like minimum quantity lubricant (MQL). The MQL with pure oil tends to produce results close to the cutting fluid method, but improvements in its cooling capacity are still mainly needed. Therefore, this work studies the MQL with oil-water dilution (1:1, 1:3, and 1:5) varying the feed rate in the external cylindrical grinding of AISI 4340 steel, comparing it with pure MQL and the conventional method with abundant cutting fluid. The results of applying MQL 1:5 produced workpieces with similar quality to that obtained with the conventional cutting fluid. In addition, the MQL method resulted in less variation with the increase of feed rate when compared to other lubri-refrigerant methods applied. Department of Mechanical Engineering São Paulo State University (UNESP),School of Engineering Department of Electrical Engineering São Paulo State University School of Engineering Department of Mechanical Engineering São Paulo State University (UNESP),School of Engineering Department of Electrical Engineering São Paulo State University School of Engineering FAPESP: 2018/22661-2

Made available in DSpace on 2021-06-25T12:35:10Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-01-27 Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) The grinding process consists of an essential stage of manufacture that is justified by the process' ability to guarantee precise dimensions and provide an excellent surface finish. In the present study, two grinding wheels of cubic boron nitride (CBN) abrasive grains with different friability (GL and GS) were used to perform the cylindrical grinding of the austempered ductile iron (ADI). This work compared the individual performance of each wheel, with CBN GL being of low friability and CBN GS of high. During machining with three feed rates (0.5, 1.0, and 1.5 mm/min), the conventional lubri-refrigeration method was used. In the workpieces analyzed, the tests of surface roughness, roundness deviation, specific energy, G-ratio, acoustic emission, cost analysis, microhardness, confocal microscopy, and optical microscopy were applied. The tests showed that, in almost all the output parameters, the best results obtained were using the CBN GL wheel with less friability. However, in the analysis of acoustic emission and specific energy, the results presented that the GS wheel obtained the best results; as it is a more friable tool, the efforts applied during the grinding of the GS wheel are less. Also, the microstructure analyses showed that both wheels were able to carry out the process without causing changes in the workpieces' mechanical properties. The cost analysis of the inputs showed that the increase in the feed rate produces the lowest cost. Sao Paulo State Univ Julio de Mesquita Filho, Dept Mech Engn, Bauru Campus, Bauru, SP, Brazil Fed Inst Parana, Dept Control & Ind Proc, Jacarezinho Campus, Jacarezinho, Parana, Brazil Sao Paulo State Univ Julio de Mesquita Filho, Dept Elect Engn, Bauru Campus, Bauru, SP, Brazil Sao Paulo State Univ Julio de Mesquita Filho, Dept Mech Engn, Bauru Campus, Bauru, SP, Brazil Sao Paulo State Univ Julio de Mesquita Filho, Dept Elect Engn, Bauru Campus, Bauru, SP, Brazil FAPESP: 2018/22661-2 FAPESP: 2019/24933-2

Made available in DSpace on 2021-06-25T12:31:45Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-01-07 Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) The industrial market demands productivity and highest quality. Abrasion machining is a crucial point for achieving both requirements. In view of this importance, in this work, a comparative analysis is made between two wheels with different friability (low and high) in the cylindrical grinding of SAE 4340 steel and ductile iron SAE D-7003 with three feed rates (0.25, 0, 50, and 1.00 mm/min) under conventional cooling and lubrication conditions. The output parameters were average surface roughness (Ra), roundness error, wheel wear, specific energy, microhardness, and cost analysis. In a complementary way, qualitative analyzes of the surface were performed through optical microscopy, scanning electron microscopy (SEM), and confocal microscopy. It is observed that the greater ductility of the iron causes 18% rougher surfaces and less tool wear. Note that the specific energy is reduced by at least 10% with more friable wheels. On average, roundness errors are 30% lower for SAE 4340 steel, with no microstructural changes for both materials. Finally, the implementation costs for the different grinding wheels decrease with an increase in the rate of advance. Sao Paulo State Univ Julio de Mesquita Filho, Dept Mech Engn, Bauru Campus, Bauru, SP, Brazil Fed Inst Parana, Dept Control & Ind Proc, Jacarezinho Campus, Jacarezinho, Parana, Brazil Sao Paulo State Univ Julio de Mesquita Filho, Dept Elect Engn, Bauru Campus, Bauru, SP, Brazil Sao Paulo State Univ Julio de Mesquita Filho, Dept Mech Engn, Bauru Campus, Bauru, SP, Brazil Sao Paulo State Univ Julio de Mesquita Filho, Dept Elect Engn, Bauru Campus, Bauru, SP, Brazil FAPESP: 2016/23910-0 FAPESP: 2017/03788-9 FAPESP: 2018/22661-2

DOI: 10.1590/2179-8966/2020/45203 Resumo Este artigo contem uma reflexao comparada entre modelos de Realismo Juridico , no campo da Teoria do Direito , considerando-se as concepcoes do Realismo Juridico Metodologico (Riccardo Guastini), no âmbito da teoria italiana, e da Teoria do Humanismo Realista (Eduardo C. B. Bittar), no âmbito da teoria brasileira . Assim, este artigo se ocupa de demonstrar as conexoes aproximativas e distintivas entre as duas concepcoes de Realismos Juridicos , dando-se destaque aos temas da indeterminacao da linguagem, dos textos juridicos e do papel central que a interpretacao desempenha para os debates contemporâneos em Teoria do Direito . Palavras-chave: Realismo Juridico; Linguagem Juridica; Interpretacao Juridica. Abstract This paper is a comparative reflection on the models of Legal Realism , in the Theory of Law , considering the conceptions of the Methodological Legal Realism (Riccardo Guastini), in the Italian perspective, and of the Theory of Realistic Humanism (Eduardo C. B. Bittar), in the Brazilian perspective. Therefore, this article shows the similarities and disconnections between the two conceptions of Legal Realisms , especially considering the domain of the indetermination of language, the legal texts and the central role of the legal interpretation to the contemporary Theory of Law. Keywords: Legal Realism; Legal Discourse; Legal Interpretation.

Se describe una investigación cualitativa de caso, con un grupo de quince estudiantes de secundaria del estado de San Luis Potosí, México, acerca de una experiencia en aula donde se abordó una aproximación al estudio del teorema de Pitágoras, en la que se analizó la relación entre los lados de un triángulo rectángulo. Apoyados en la Socioepistemología, se diseñaron situaciones variacionales al adaptar al aula la elaboración y uso de las tolvas que se construyen en la industria de la Pailería. Las estrategias variacionales de comparación, seriación, predicción y estimación realizadas por los alumnos, sobre los datos que obtuvieron al medir los lados de un triángulo rectángulo visualizado al interior de las tolvas, les permitieron resignificar, en términos del almacenamiento y vaciado de material granulado de las tolvas, la relación matemática señalada por el teorema.

[Purpose] The objective of this paper is to study alternative dispute resolution mechanisms in both the electronic contracting of goods and/or services and interactive advertising. [Methodology/Approach/Design] The Spanish and European regulations will be analyzed in terms of regulation and self-regulation mechanisms. Self-regulation instruments are a suitable complement to current legal regulations. [Findings] Although disputes that may arise between consumers and businesses can be settled in court, the circumstances of cases involving e-commerce and interactive advertising may determine that the use of out-of-court instruments is appropriate. In this sense, self-regulation systems promote conflict prevention. In the event that it arises, it is about reaching a faster resolution than the courts of justice, cheaper and carried out by specialists in the matter. [Practical Implications] The implications of this investigation may be applicable to transactions of goods and services in general, to civil society and to the public sector. [Originality] This investigation demonstrates the convenience and significance of considering out-of-court dispute resolution mechanisms over conventional means, both in Spain and in the European Union. The self-regulation instruments are based on a Code of Conduct and an impartial and independent control body that applies it. Normally, codes of conduct are based on the application of different instruments for extrajudicial conflict resolution.

O uso de combustíveis fósseis tem intensificado cada vez mais a emissão de gases poluentes à atmosfera, dessa forma, o etanol de segunda geração, obtido por matéria prima lignocelulósica surge como alternativa por ser considerado uma energia limpa. O biocombustível pode ser produzido a partir de resíduos gerados da fruticultura, como exemplo, a casca da manga, a qual possui uma composição satisfatória à produção do bioetanol. Este trabalho teve por objetivo, a produção de açúcares fermentescíveis, a partir desta matéria prima, para isso, foi realizado um planejamento fatorial acerca das principais variáveis de interesse no processo, e empregado a técnica da hidrólise ácida. Pôde-se observar, um aumento de 25,49% na formação de açúcares fermentescíveis comparados a composição in natura da matéria em estudo.

Made available in DSpace on 2021-06-25T12:23:37Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-10-01 Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Post Graduate Program of Mechanical Engineering of UFU Post Graduate Program of Mechanical Engineering of UNESP (Bauru campus) ITW Chemical Products Ltda Saint Gobain group One of the peculiarities associated with the grinding process is the large amount of heat generation. Therefore, the cooling lubrication technique plays an important role and must be conducted efficient. Even though the conventional cooling lubrication technique generally outperforms all other techniques, its use is harmful to both the environment and the health of the operator. Thus, techniques that minimize the use of cutting fluids are necessary. Among the various techniques available, minimum quantity of lubrication (MQL) has been widely employed in machining scenarios. However, its use in grinding is questioned because of the poor surface finish generated and thermal damage due to the clogging of the abrasive wheel pores during grinding. To overcome these problems, in this study, an auxiliary cleaning system (CS) of the wheel was used to remove the chips and oil from the clogged wheel surface during grinding, while assessing the CS performance with the aim of making the MQL a technically viable cooling lubrication alternative. Grinding trials were performed on hardened steel under three different cutting conditions using the conventional (flood) cooling lubricant technique and the MQL technique, by applying a biodegradable cutting fluid, with and without the CS. The CS performance was evaluated with regard to the roughness, roundness errors, wheel wear, grinding power, microhardness and residual stresses. Results of both surface roughness and grinding wheel wear were also used to determine empirical equations comparing the traditional MQL technique and the MQL technique with auxiliary cleaning system (MQL + CS). The results showed that MQL assisted with the CS can improve the machined surface integrity, reducing the surface roughness, roundness error and the variation in the microhardness. Furthermore, the MQL + CS condition also presented lower grinding wheel wear. Univ Fed Uberlandia, Sch Mech Engn, Uberlandia, MG, Brazil Inga Univ Ctr UNINGA, Dept Mech Engn, Rod PR-317,6114,Parque Ind 200, BR-87035510 Maringa, Parana, Brazil Sao Paulo State Univ Julio De Mesquita Filho, Dept Mech Engn, Bauru Campus, Bauru, SP, Brazil Univ Minas Gerais, Dept Mech Engn, Av Antonio Carlos 6627, BR-31270901 Belo Horizonte, MG, Brazil Sao Paulo State Univ Julio De Mesquita Filho, Dept Elect Engn Bauru, Bauru Campus, Bauru, SP, Brazil Sao Paulo State Univ Julio De Mesquita Filho, Dept Mech Engn, Bauru Campus, Bauru, SP, Brazil Sao Paulo State Univ Julio De Mesquita Filho, Dept Elect Engn Bauru, Bauru Campus, Bauru, SP, Brazil CAPES: 001

Made available in DSpace on 2020-12-10T20:07:46Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-08-05 Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) The grinding process is a finishing operation that guarantees the surface of the workpieces with geometric and dimensional precision. This machining requires significant efforts to remove material, which can cause excessive wheel wear and even distortions on the workpiece surface. Also, the productivity and efficiency of this process are directly affected by the properties of the workpiece, wheel friability, and feed rate. In this context, it is essential to find the best machining conditions. Thus, this article makes a comparative analysis between the cylindrical grinding of SAE D-7003 ductile iron (DI) and SAE D-7003 austempered ductile iron (ADI), with two wheels of cubic boron nitride (CBN), one with low and the other with high friability, using feed rate of 0.50, 1.00, and 1.50 mm/min. The lubri-refrigeration of the process was done by the conventional method. The output parameters evaluated were surface roughness (Ra), roundness error, diametral wheel wear, tangential cutting force, microhardness, and micrograph. The tool with less friable grains reduces the surface roughness by 18%, 21%, and 29% compared with the tool with more friable grains for grinding of the DI with the feed rate of 0.50, 1.00, and 1.50 mm/min, respectively. In the ADI, the surface roughness is reduced by 27%, 26%, and 29% with a feed rate of 0.50, 1.00, and 1.50 mm/min, respectively. The results show that the low friability tool performs better in most parameters. Sao Paulo State Univ Julio de Mesquita Filho, Dept Mech Engn, Bauru Campus, Bauru, SP, Brazil Fed Inst Parana, Dept Control & Ind Proc, Jacarezinho Campus, Jacarezinho, Parana, Brazil Sao Paulo State Univ Julio de Mesquita Filho, Dept Elect Engn, Bauru Campus, Bauru, SP, Brazil Sao Paulo State Univ Julio de Mesquita Filho, Dept Mech Engn, Bauru Campus, Bauru, SP, Brazil Sao Paulo State Univ Julio de Mesquita Filho, Dept Elect Engn, Bauru Campus, Bauru, SP, Brazil FAPESP: 2018/22661-2

Made available in DSpace on 2020-12-10T20:04:51Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-07-09 Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) The final quality of mechanical components has been increasingly desired in the industry. This final quality is directly linked to surface roughness, geometric deviations, and mechanical integrity of components subjected to machining processes. For that, the industry makes use of cutting fluids so that it is possible to achieve such conditions. In the case of grinding, the application of cutting fluid in abundance allows a great reduction in temperature, as well as a better removal of chips from the cutting surface of the wheel. However, the problems generated by the cutting fluid related to environmental and labor liabilities have increasingly led to the development of effective techniques for grinding with minimal amounts of cutting fluid. The difficulties linked to the use of MQL are concentrated in the low rate of heat removal and in the clogging of the cutting surface, varying according to the type of grinding wheel applied. In this sense, the present work proposes comparison during the cylindrical grinding of hardened steel under conventional lubrication conditions, minimum quantity lubricant (MQL), cooled air MQL (MQL + CA), and MQL with wheel cleaning jet (MQL + WCJ), using aluminum oxide (Al2O3) and CBN grinding wheels. The results are presented in terms of surface roughness, roundness error, microhardness, tangential force, diametrical wear of the grinding wheels, and G-ratio. The application of MQL + CA and MQL + WCJ can improve the use of MQL. In terms of roughness, the MQL + WCJ presents values close to the conventional increase of 8.8%. Roundness errors were reduced by up to 36.3% during the application of MQL + CA and MQL + WCJ and up to 10.5% for the tangential force. Thus, these advanced techniques have shown that the conditions are feasible for the application of pure MQL towards an eco-friendly grinding process. Sao Paulo State Univ Julio de Mesquita Filho, Dept Mech Engn, Bauru Campus, Bauru, SP, Brazil Sao Paulo State Univ Julio de Mesquita Filho, Dept Elect Engn, Bauru Campus, Bauru, SP, Brazil Sao Paulo State Univ Julio de Mesquita Filho, Dept Mech Engn, Bauru Campus, Bauru, SP, Brazil Sao Paulo State Univ Julio de Mesquita Filho, Dept Elect Engn, Bauru Campus, Bauru, SP, Brazil FAPESP: 2018/22661-2 FAPESP: 2019/24933-2

Made available in DSpace on 2020-12-10T20:03:39Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-06-30 Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) The final quality of mechanical components is directly linked to the efficiency of the machining processes to which it is subjected. In this sense, grinding can provide high standards of surface and geometric quality for mechanical components, since these characteristics are increasingly necessary for the automotive and aerospace sectors. However, the complexity of the mechanical components creates increasing difficulties for grinding. Workpieces with geometric interruptions, as in the case of gears, splined shafts, pistons, and crankshafts generate mechanical impacts and aggravate the thermal gradients during grinding, causing errors of shape, drop in surface quality and reduction in the life of the cutting tool. However, few studies on better conditions for interrupted cut grinding are seen, thus making it difficult to determine ideal grinding conditions. Thus, the present experimental investigation aims to make a comparison between cylindrical grinding of workpieces of hardened AISI 4340 steel with two, six, and twelve geometric interruptions, comparing them with the grinding workpieces without interruptions, applying white aluminum oxide wheels with vitrified and resinoid bonds. Results in terms of surface roughness, roundness deviation, acoustic emission, grinding power, diametrical wheel wear, and micrography are pointed out, indicating that the greater rigidity of the vitrified bond can be harmful during the grinding of workpieces with interrupted geometry. Sao Paulo State Univ Julio de Mesquita Filho, Dept Mech Engn, Bauru Campus, Bauru, SP, Brazil Sao Paulo State Univ Julio de Mesquita Filho, Dept Elect Engn, Bauru campus, Bauru, SP, Brazil Sao Paulo State Univ Julio de Mesquita Filho, Dept Mech Engn, Bauru Campus, Bauru, SP, Brazil Sao Paulo State Univ Julio de Mesquita Filho, Dept Elect Engn, Bauru campus, Bauru, SP, Brazil FAPESP: 2017/03788-9 FAPESP: 2018/22661-2

This article discusses ways in which the São Paulo human rights short film festival-Entretodos developed between 2013 and 2016. It considers the festival from the perspective of a coordinator and promoter, discussing its achievements within the socio-political context of this global city, and of Brazil more broadly, where there has been resistance to advances in human rights culture (HRC). Data from the festival gave rise to an analysis of the relationship between art and emancipation, which is presented here from a philosophical perspective. The author illustrates how the experience of hosting a human rights short film festival in São Paulo has led to the development of a municipal human rights education (HRE) policy and to the conviction that art and citizenship, including learning for citizenship, human right and conviviality, can go hand-in-hand. The article argues for a pedagogy of sensibility, which centres learners’ humanity, as an approach to HRE.

Made available in DSpace on 2020-12-12T02:41:38Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-06-01 The real-time monitoring of manufacturing processes is essential to achieve high-quality standards and uniformity at reduced costs. The monitoring of machining processes is usually performed by acoustic emission sensors, which measure the dynamic waves of mechanical stress that propagate through the material during the grinding process. This work studies the application of knock sensors, commonly used in the monitoring of combustion engines, as a low-cost and high-robustness alternative to acoustic emission sensors in the monitoring of the grinding process. Built to operate mechanically attached to the engine block, the knock sensor is resistant to high temperatures, liquids, and particles. In order to demonstrate the feasibility of the sensor, different tests were performed. By determining its resonant frequency, it was possible to identify the response curve of the sensor and its optimal operating range. The acoustic impulse test, generated by the pencil lead break technique, allowed the comparative analysis of the spectral performance between the acoustic emission sensor and the knock sensor. The performance of the knock sensor in an industrial environment was also verified in a case study. The results showed a similar spectral behavior between both sensors when subjected to the same stimulus, demonstrating the feasibility of using the knock sensor to monitor the grinding process. School of Engineering University Center of Lins (UNILINS) Electrical Engineering Department School of Engineering São Paulo State University (UNESP) Electrical Engineering Department School of Engineering São Paulo State University (UNESP)

Made available in DSpace on 2020-12-12T02:44:09Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-06-01 Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) The use of cutting fluid in the grinding process is crucial to guarantee quality in the products. However, most cutting fluids can cause disease to operators and damage the environment, which adds costs to the industry, as well as a deficit in the operator’s quality of life. In addition, the metalworking industry has as problem control corrosion in their parts; it demands to add the process of remove cutting fluid of the workpieces and add a protective oil on their surface. In this context, a new class of corrosion inhibitors that use water as a propagation medium, generically known as V-active® VCI, was formulated, which made it possible to develop, firstly, a cutting fluid with the addition of such inhibitor, called generically VCI 1, which would eliminate the process of degreasing and adding protective oil. Previous research has indicated the VCI 1 has an excellent performance in the grinding process, which promoted the development of two other new fluids (named generically VCI 2 and VCI EP) at a reduced market cost to make the product more competitive. In addition to the cost savings compared with the VCI 1, the VCI EP has the differential of an extreme pressure additive. It is noteworthy that the fluids in question pose no risk to humans and are biodegradable. Thus, the performance of these two new fluids with a corrosion inhibitor was verified in the grinding process of AISI 4340 steel with an aluminum oxide grinding wheel and the results were compared with the higher market cost V-active® VCI fluid and with a base fluid without the corrosion inhibitor. The comparison took place at three different feed rates (0.25, 0.50, and 0.75 mm/min). For each feed rate, the following were evaluated: surface roughness; roundness error, diametral grinding wheel wear, microhardness, optical microscopy, and acoustic emission, and the ground surface was analyzed using scanning electron microscopy (SEM). Therefore, useful information was obtained for the technological development of the rectification process, thus adding to scientific knowledge and dissemination of knowledge to society. Department of Mechanical Engineering School of Engineering São Paulo State University (UNESP) Department of Control and Industrial Processes Federal Institute of Education Science and Technology of Parana, Jacarezinho Campus, Jacarezinho VCI Brasil, Rod. Marechal Rondon KM 334,3 Department of Electrical Engineering School of Engineering São Paulo State University Department of Mechanical Engineering School of Engineering São Paulo State University (UNESP) Department of Electrical Engineering School of Engineering São Paulo State University FAPESP: 2015/09868-9 FAPESP: 2017/03788-9 FAPESP: 2017/03789-5 CNPq: 312588/2006-2

Made available in DSpace on 2020-12-10T20:03:15Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-06-23 Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Abrasion machining has stood out in the current industry due to constant improvements in the dimensional accuracy of a workpiece in its finishing process. Thus, it is necessary to use cutting fluid to cool and lubricate the workpiece-wheel contact, to reduce both the high temperatures reached and the friction. However, conventional cutting fluid is harmful to the environment and poses a risk to the operator's health. As a result, the minimum lubricant quantity (MQL) technique emerged, using extremely smaller amounts of fluid and, however, showing excellent results in its applications. In this way, it could further optimize this method through studies on oil dilution, combating low cooling capacity. A fundamental concept for selecting the grinding wheel type to be used in grinding is friability, but there are few studies on its influence on the process. For these reasons, this research analyzed the impact of friability and the effects of MQL dilution on the grinding of austempered ductile iron, the use of two CBN wheels with high and low friability, and four types of lubri-refrigerant methods: flood, pure MQL, and diluted MQL in the oil-water ratio 1:5 and 1:10. Output parameters were analyzed: surface roughness (Ra), roundness error, diametrical wheel wear, cutting power, acoustic emission, viscosity, 3D confocal, and microhardness. The results show an improvement of the diluted MQL over the pure, coming close to the conventional method. Besides, the low friability wheel was more efficient in the analysis of surface roughness, roundness error, and diametrical wheel wear. However, most friable stood out in the results of acoustic emission and grinding power. Sao Paulo State Univ Julio de Mesquita Filho, Dept Mech Engn, Bauru Campus, Bauru, SP, Brazil Fed Inst Parana, Dept Control & Ind Proc, Jacarezinho Campus, Jacarezinho, Parana, Brazil Sao Paulo State Univ Julio de Mesquita Filho, Dept Elect Engn, Bauru Campus, Bauru, SP, Brazil Sao Paulo State Univ Julio de Mesquita Filho, Dept Mech Engn, Bauru Campus, Bauru, SP, Brazil Sao Paulo State Univ Julio de Mesquita Filho, Dept Elect Engn, Bauru Campus, Bauru, SP, Brazil FAPESP: 2016/23910-0 FAPESP: 2018/22661-2 FAPESP: 2019/24933-2

Made available in DSpace on 2020-12-10T20:00:07Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-05-25 Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Among conventional machining processes, grinding presents itself as a material removal process that can produce workpiece with excellent surface finish and high geometric precision. Given the high industrial demand, more and more machining methods are being sought to allow high production speeds coupled with reduced costs. The requirement for high productivity and low-cost grinding processes often bumps into the geometry of the desired workpiece. Numerous grounded components in the automotive, aeronautics, and naval industries have geometric interruptions, such as ring seating channels and lubrication ducts. Interrupted grinding leads to shorter tool life and can lead to a decrease in the dimensional and surface quality of the mechanical component, thus requiring grinding of these components at low speeds. Thus, the present paper shows an experimental evaluation of interrupted cylindrical grinding of hardened steel AISI 4340 with vitrified aluminum oxide grinding wheel. Interrupted circular workpieces (2, 6, and 12 channels) were applied to simulate interruptions found in mechanical components subjected to interrupted grinding at feed rates of 0.25, 0.50, and 0.75 mm/min, at cutting speed of 32 m/s, under conventional lubrication, compared with uninterrupted workpieces under the same machining conditions. The output parameters evaluated were surface roughness, roundness deviation, grinding power, micrography, diametral wheel wear, and G-ratio, being evaluated statically by analysis of variance (ANOVA). There were no verified regions with burning or microcracks in all conditions. Still, the increase in the rate of advancement generated a drop of up to 68.7% in surface roughness, 40.5% in shape errors, and an increase in diametrical degreasing of the average grinding wheel of 90.9%. The wheel wear was more accentuated due to the number of interruptions, reaching a wear rate of up to 252% higher than the conventional condition. Sao Paulo State Univ Julio de Mesquita Filho, Dept Mech Engn, Bauru Campus, Bauru, SP, Brazil Sao Paulo State Univ Julio de Mesquita Filho, Dept Mech Engn, Bauru Campus, Bauru, SP, Brazil FAPESP: 2018/22661-2

Made available in DSpace on 2020-12-10T19:57:40Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-04-27 Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) This work aimed to study the application of minimum quantity of lubricant (MQL) with the addition of water, respecting the proportions 1:0, 1:5, 1:10, and 1:20 oil-water, in the cylindrical grinding of austempered ductile iron (ADI). Also, two cubic boron nitride (CBN) grinding wheels, with distinct friability levels, were used. The analysis of surface roughness (Ra), roundness error, G-ratio, grinding power consumed, specific grinding energy, microhardness, and microstructure was done using confocal and optical microscopy. The results show that the addition of water to the MQL mixture significantly improves its characteristics. Thus, MQL 1:5 (oil-water) produced the best results among the alternative methods analyzed. Also, all MQL variations did not produce microstructural change or thermal damage to the workpieces. Besides, the less friable grinding wheel (CBN GL) produced better surface quality of the workpieces and caused less wheel wear compared with the more friable wheel (CBN GS). On the other hand, the more friable wheel used less power during the grinding. Sao Paulo State Univ Julio de Mesquita Filho, Dept Mech Engn, Bauru Campus, Bauru, SP, Brazil Fed Inst Parana, Dept Control & Ind Proc, Jacarezinho Campus, Jacarezinho, Parana, Brazil Sao Paulo State Univ Julio de Mesquita Filho, Dept Elect Engn, Bauru Campus, Bauru, SP, Brazil Sao Paulo State Univ Julio de Mesquita Filho, Dept Mech Engn, Bauru Campus, Bauru, SP, Brazil Sao Paulo State Univ Julio de Mesquita Filho, Dept Elect Engn, Bauru Campus, Bauru, SP, Brazil FAPESP: 2016/23910-0 FAPESP: 2018/22661-2

La gastronomía peruana es muy rica debido a la variedad de productos nativos e importados y a la variedad de sus regiones geográficas y a los aportes culinarios locales y los que fueron llevados de Europa, África y Asia Entre los elementos introducidos estuvo la vid. Esta planta y su producto, el vino eran imprescindibles para la gastronomía y el culto de los españoles. Ya en 1547 el cronista Cieza de León describe las parras que vio en el Perú y el jesuita Acosta afirma que fue en el Perú donde se produjo el primer vino de América. A partir de inicios del siglo XVII se comenzó a destilar un aguardiente de vino que con el tiempo se llamó pisco por ser desde el puerto de ese nombre por donde se exportaba. Tanto los viajeros como documentos oficiales dan testimonio de este hecho. En 1936, con el fin de confundir a la administración de los Estados Unidos, Chile cambió el nombre de un pueblo llamado La Unión por el de “Pisco Elqui” para aprovechar el ganado prestigio del pisco y aplicarlo a su destilado.

INTRODUÇÃO: O titânio é um dos materiais mais utilizados para a fabricação de estruturas implanto-suportadas devido à sua biocompatibilidade e propriedades mecânicas adequadas. Recentemente, o PEEK foi introduzido como alternativa devido ao seu reduzido peso, resistência adequada e propriedades químicas e físicas semelhantes ao osso humano. OBJETIVO: O objetivo principal deste trabalho foi realizar uma revisão sistemática integrativa sobre PEEK Vs Titânio em estruturas sobre implantes. MATERIAIS E MÉTODOS: Pesquisa de artigos científicos em PubMed (National Library of Medicine), utilizando combinações das palavras-chave: ‘’titanium’’; ‘’polymer’’; ‘’abutments, dental’’; ‘’biomechanics’’; ‘’dental prosthesis design’’; ‘’dental prostheses, implant supported’’ restrita aos últimos 10 anos. RESULTADOS: Seleção de 21 artigos após a aplicação dos critérios de inclusão e exclusão. DISCUSSÃO: PEEK apresenta menor resistência à fratura que o Titânio e as cargas obliquas e distais resultam em maior stress. Os pilares PEEK podem ser utilizados na região anterior da maxila. O material dos pilares influenciou a força e tipo de fratura do material restaurador. As estruturas em titânio apresentam menor adesão às facetas do que em PEEK. PEEK reduziu tensões aplicadas em si mesmo. A rugosidade superficial foi menor para PEEK do que em titânio, assim como a formação de biofilme. CONCLUSÃO: A transmissão de tensões ao complexo protético e tecidos periimplantares é inversamente proporcional ao módulo elástico do material. Materiais mais rígidos como o titânio apresentam melhores propriedades mecânicas, nomeadamente em áreas posteriores e cantiléver. A biocompatibilidade de PEEK e titânio foi similar, apresentando reações tecidulares aceitáveis, mas a estética do polímero foi superior. INTRODUCTION: Titanium is one of the most used materials for the fabrication of implant-supported structures due to its biocompatibility and adequate mechanical properties. Recently, PEEK was introduced as an alternative due to its light weight, adequate strength and chemical and physical properties similar to human bone. OBJECTIVE: The main objective of this work was to carry out an integrative systematic review on PEEK Vs Titanium in implant structures. MATERIALS AND METHODS: Search for scientific articles in PubMed (National Library of Medicine), using combinations of keywords: ''titanium''; ''polymer''; ''abutments, dental''; ''biomechanics''; ''dental prosthesis design''; ''dental prostheses, implant supported'' restricted to the last 10 years. RESULTS: Selection of 21 articles after applying the inclusion and exclusion criteria. DISCUSSION: PEEK has lower fracture strength than Titanium and oblique and distal loads result in greater stress. PEEK abutments can be used in the anterior region of the maxilla. The material of the abutments influenced the strength and type of fracture of the restorative material. Titanium frameworks have less adhesion to veneers than PEEK frameworks. PEEK reduced stresses applied to itself. Surface roughness was lower for PEEK than titanium, as was biofilm formation. CONCLUSION: The transmission of stresses to the prosthetic complex and peri-implant tissues is inversely proportional to the elastic modulus of the material. Stiffer materials such as titanium have better mechanical properties, namely in posterior and cantilever areas. The biocompatibility of PEEK and titanium was similar, showing acceptable tissue reactions, but the aesthetics of the polymer was superior.

Made available in DSpace on 2022-05-01T15:13:39Z (GMT). No. of bitstreams: 0 Previous issue date: 2022-01-01 The VP50IM steels were developed to manufacture molds for thermoplastics injection and dies for thermoplastics extrusion. This article compares the grinding of VP50IM steel with black silicon carbide grinding wheel using the flood method and the minimum quantity of lubricant system (MQL) using feed rates of 0.25, 0.50, and 0.75 mm/min. The output parameters analyzed were surface roughness (Ra), roundness error, diametrical wheel wear, tangential cutting force, metallography, microhardness, scanning electron microscopy (SEM), cost analysis, and CO2 emission. The results revealed that the conventional system, due to its higher lubri-refrigerant capacity, provided a better performance compared to the MQL system. Furthermore, the lower feed rates provided superior results than higher feed rates. On the other hand, the results related to the cost and pollution show a superiority of the MQL system due to the lower use of lubricants. In addition, a higher feed rate was a determining factor in achieving a reduction in pollution and process cost. Department of Mechanical Engineering São Paulo State University “Júlio de Mesquita Filho” Department of Control and Industrial Processes Federal Institute of Paraná, Jacarezinho campus Department of Mechanical Engineering São Paulo State University “Júlio de Mesquita Filho”

Made available in DSpace on 2020-12-10T19:49:25Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-01-01 The minimum quantity lubrication + nanofluid technique has proven to be feasible in machining processes, since it has shown potential for improvements through its lubri-refrigeration and heat removal characteristics, beyond increase the surface quality workpiece surface, while minimizing diametrical wheel wear. Also, the nanofluids are associated with decreasing the grinding power corroborates for process efficiency. In this way, this work evaluates the combination of the MQL + nanofluid (MQL + Nano) technique and compares its results with the cutting fluid abundant application (Flood) technique, traditional MQL and MQL associated with wheel cleaning jet (MQL + WCJ). Accordingly, the process output variables were analyzed: surface roughness (Ra), roundness error, diametral wheel wear, optical microscopy and microhardness from the workpiece ground surface, grinding power, specific energy grinding, acoustic emission, cutting fluid viscosity and transmission electron microscopy of the TiO2 nanoparticle used. The techniques applied in this work did not cause microstructural alteration in the workpieces, proving that the lubri-refrigeration methods are efficient. Even though the cutting fluid viscosity decreased by about 60% with the addition of TiO2 nanoparticles and the application of the MQL + Nano technique proved to be efficient in comparison to the traditional MQL, the MQL + WCJ application presented the best results among the alternative lubri-refrigeration techniques. Thereby, the MQL + WCJ corroborated to a better workpiece surface quality, while presented the lower diametrical wheel wear, surface roughness and roundness error values, contributing to the minimization of the industrial residues and cooperating with the environment and health of the worker. Sao Paulo State Univ, Dept Mech Engn, Bauru Campus, Bauru, SP, Brazil Sao Paulo State Univ, Dept Chem, Bauru Campus, Bauru, SP, Brazil Fed Inst Parana, Dept Control & Ind Proc, Jacarezinho Campus, Jacarezinho, Parana, Brazil Sao Paulo State Univ, Dept Mech Engn, Bauru Campus, Bauru, SP, Brazil Sao Paulo State Univ, Dept Chem, Bauru Campus, Bauru, SP, Brazil

Made available in DSpace on 2020-12-12T02:32:03Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-01-01 Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) This paper discusses the correlations between the electromechanical impedance (EMI) technique and grinding parameters. The EMI technique applied in grinding is novel and has the advantage of employing cheaper equipment and requiring a simpler monitoring system when compared to traditional techniques, such as acoustic emission. Experimental tests were conducted in a controlled environment to isolate the variables of interest, and real and imaginary parts of the impedance were investigated for several frequency bands. Strong correlations among EMI and equivalent chip thickness, roughness, and microhardness of the workpiece, as well as power signals, were found. The RMSD (root-mean-square deviation) index for the real part of the signature in the band 80–85 kHz showed good correlation with roughness and power, while the CCDM (correlation coefficient deviation metric) index for the imaginary part of 50–55 kHz showed good correlation with microhardness. Those correlations allow the user to infer information about the grinding process through indirect monitoring. Department of Electrical Engineering Sao Paulo State University (UNESP), Av. Eng. Luís Edmundo Carrijo Coube, 14-01 – CEP School of Mechanical Engineering Federal University of Uberlândia (UFU), Av. João Naves de Ávila, 2121 School of Integrated Studies Kansas State University Polytechnic Campus, 2310 Centennial Rd Department of Mechanical Engineering Sao Paulo State University (UNESP), Av. Eng. Luís Edmundo Carrijo Coube, 14-01 Department of Electrical Engineering Sao Paulo State University (UNESP), Av. Eng. Luís Edmundo Carrijo Coube, 14-01 – CEP Department of Mechanical Engineering Sao Paulo State University (UNESP), Av. Eng. Luís Edmundo Carrijo Coube, 14-01 CNPq: 426018/2018-4 CAPES: PDSE 88881.190384/2018-01

Nowadays, most of the world’s population lives in urban centers, where air quality stand- 12 ards are not strictly observed; citizens are exposed to air quality levels over the limits of the World 13 Health Organization. The interaction between the issuing and atmospheric sources influences the 14 air quality or level. The local climatic conditions (temperature, humidity, winds, rainfall) determine 15 a greater or less dispersion of the pollutants present. In this sense, this work aimed to build a math 16 modelling prediction to monitor the air quality around the campus of IPBeja, which is in the vicinity 17 of a car traffic zone. The study analyzed the data from the last months, particulate matter (PM10 18 and PM2.5), and meteorological parameters for prediction using NARX. The device contains a par- 19 ticle sensor (NOVA SDS011), a microcontroller ESP8266 NodeMCU v3, a temperature sensor, hu- 20 midity, pressure BME280, and a suction tube. The results show a considerable increase in particles 21 in occasional periods, reaching average values of 135 μg/m3 for PM10 and 52 μg/m3 for PM2.5. 22 Thus, the monitoring and prediction serve as a warning to perceive these changes and be able to 23 relate them to natural phenomena or issuing sources in specific cases.