Redução do tempo de setup de máquinas de usinagem em uma industria automobilística

Continuous improvement of industrial processes is one way to become companies more competitive in the market. For this, a fairly widespread use is the methodology of lean production systems, by eliminating waste. One of the tools of these systems is the method of rapid exchange of die or also called SMED, which will be applied in this study. The study aims to develop proposals for reducing the time of set up of two machines in two machining lines, watching also the ergonomics and safety conditions in this operations. The set up time reduction is justified among others, due to increase the machine productivity. In applying the connecting rod machining line, there were two types of exchange. Reductions in time to set up proposals reached values of 47% to one of them, and 55% to the other. It is important to underline that to reach this result, there was no need for large investments. In the application in block machining line, was developed an improvement in the ergonomic area. It was placed a pulley block that came to increase the time of tool change. Aiming to improve the security of the exchange, without productivity loss, the method was applied to reduce this time. It was developed two proposals.: the first would reduce that time by 19%, and does not require many resources of the company. The second involves the parallelization of the exchange, so that the reduction is 48%. However, this proposal requires one more manpower at the time of exchange and it is not always possible

Influência dos parâmetros de projeto em um motor a combustão interna

This paper discusses the influence of the design parameters in the operation and construction of an internal combustion engine. A theoretical analysis was developed using a standard crank-connecting rod-piston to verify the behavior of the stresses generated in the combustion and transformed into rotational energy of the crank shaft. Design parameters directly influence not only the final result of the characteristics of power and torque, but how the engine must be built to withstand different loads. The choice of parameters of a combustion engine is directly linked with the application of the engine and the final result expected of it function

Matriz Bertholdo/Ricci/Barrotte (BRB): uma simplificação de técnica para obtenção de guia de estratificação com compósitos

Advanced Layering composite resins can be facilitated by a technique called "Lingual Matrix", where a guide is made of elastomer by molding a previously waxed tooth or sculped in an intraoral test drive restoration. This technique has many advantages to sophisticated layering, facilitation stratification, anatomic construcrion and the stages of finishing and polishing. However, in some clinical situations, the unfolding of the steps to obtains this matrix can be time consuming or even infeasible. To facilitate the achievement of this apparatus, a technique was idealized allowing significant reducrion in clinical time. This matrix, called the "BRB Matrix" is widly discussed in a didactic and clinical manner in this article, presenting its advantages in clinical cases where it is imperative to use a guide for conduction a controlled layering. The simplicity of this approach, as well as reduced clinical time and finacial costs turn it feasible in an everyday clinical practice.

Bond strenght of dental adhesive systems irradiated with ionizing irradiation

The aim of the present paper was to determine the effect of different types of ionizing radiation on the bond strength of three different dentin adhesive systems. Materials and Methods: One hundred twenty specimens of 60 human teeth (protocol number: 032/2007) sectioned mesiodistally were divided into 3 groups according to the adhesives systems used: SB (Adper Single Bond Plus), CB (Clearfil SE Bond) and AP (Adper Prompt Self-Etch). The adhesives were applied on dentin and photo-activated using LED (Lec 1000, MMoptics, 1000 mW/cm2). Customized elastomer molds (0.5 mm thickness) with three orifices of 1.2 mm diameter were placed onto the bonding areas and filled with composite resin (Filtek Z-250), which was photoactivated for 20 s. Each group was subdivided into 4 subgroups for application of the different types of ionizing radiation: ultraviolet radiation (UV), diagnostic x-ray radiation (DX), therapeutic x-ray radiation (TX) and without irradiation (control group, CG). Microshear tests were carried out (Instron, model 4411), and afterwards the modes of failure were evaluated by optical and scanning electron microscope and classified using 5 scores: adhesive failure, mixed failures with 3 significance levels, and cohesive failure. The results of the shear bond strength test were submitted to ANOVA with Tukey's test and Dunnett's test, and the data from the failure pattern evaluation were analyzed with the Mann Whitney test (p = 0.05). Results: No change in bond strength of CB and AP was observed after application of the different radiation types, only SB showed increase in bond strength after UV (p = 0.0267) irradiation. The UV also changed the failure patterns of SB (p = 0.0001). Conclusion: The radio-induced changes did not cause degradation of the restorations, which means that they can be exposed to these types of ionizing radiation without weakening the bond strength.

Disposição construtiva aplicada em cadeira antropométrica

Disposição construtiva aplicada em cadeira antropométrica. Patente de modelo de utilidade para uma cadeira antropométrica constituída de uma estrutura (1) que sustenta uma pluralidade de instrumentos de medição, sendo que a parte posterior da cadeira é provida de dois instrumentos de medição compostos por duas hastes, sendo uma delas para medida da altura tronco-encefálica (2) e a outra para a medida do assento até a região renal (4), de modo que cada uma dessas hastes possui uma escala numérica, sendo ora interna (3), ora externa (5). O assento (6) da cadeira (1) é composto por um anteparo com uma canaleta interna e dois cursores laterais deslizantes para a direita e para a esquerda, que possuem escala numérica.; O assento é provido de referências métricas sendo uma no sentido da largura do assento (8) e outra no sentido da profundidade do assento (9), sendo a escala (8) dividida em duas escalas, onde o ponto zero é exatamente o meio do assento. O assento (6) também possui acoplada uma haste frontal, com deslizamento no sentido antero-posterior (10), a qual contém uma escala interna embutida na peça, de modo que a soma entre a medida da profundidade do assento com a medida obtida pela haste deslizante horizontal (10) totalizam a medida sacro-poplítea. Para a tomada da medida da altura poplítea, há uma outra haste (11), integrada à superfície anterior da cadeira, cujo deslizamento é vertical, sendo que essa haste (11) possui uma escala numérica interna uma externa (12).; A base da cadeira (13) possui um dispositivo de acionamento lateral com o pé (16), que é conectado ao assento (6) por meio de um macaco hidráulico, permitindo a elevação do assento, sendo que a outra alavanca (17), ao ser girada, realiza a descida do assento (6).

Caracterização microestrutural e crescimento subcrítico de trincas em cerâmicas odontológicas

Pós-graduação em Odontologia Restauradora - ICT

Transfer of a cold atmospheric pressure plasma jet through a long flexible plastic tube

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Wave reflection at the end of a waveguide supported by a nonlinear spring

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Helicobacter pylori em boca: epidemiologia e associação com doenças bucais

The association of Helicobacter pylori with different gastric diseases has been continuously discussed in the literature, whereas the last 20 years a large body of publications was intended to characterize the ecological niches and habitats of this pathogen being the mouth a possible habitat for that rod. The present study aimed to discuss the occurrence of this organism as part of the supplemental or transient microbiota of the mouth. Thus, an extensive review of literature covering the period 1990-2014 was carried out with different databases, yielding 5024 articles discussing transmission and occurrence of H. pylori, in English or Portuguese. Articles were selected according to the inclusion and exclusion criteria and data were tabulated and analyzed. Despite the significant heterogeneity of the literature, it was found this microaerophilic has a worldwide distribution, even in the mouth, which behaves as a reservoir for gastric reinfection. The role of oral hygiene and periodontal disease in the distribution of this microorganism remains unclear, but most studies support the hypothesis that oral biofilms and inflammation of periodontium may facilitate the installation of this pathogen in the mouth. Studies suggest that this microorganism could collaborate as a predisposing factor for oral cancer.

Desenvolvimento de procedimentos e métodos analíticos no campo forense aplicando os princípios da química verde

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Acidose láctica ruminal aguda induzida experimentalmente em ovinos: estudo clínico e laboratorial

Pós-graduação em Medicina Veterinária - FCAV

Preliminary report of epiphytic and endophytic colonization of black oat (Avena strigosa) and wheat (Triticum aestivum) by Curtobacterium flaccumfaciens pv. flaccumfaciens in Brazil

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Análise de junta aparafusada de biela automotiva

Pós-graduação em Engenharia Mecânica - FEG