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Search Results: 1 - 10 of 35107 matches for " Anselmo Eduardo;Mei "
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Efeito da usinagem na estrutura e propriedades mecanicas do a?o superaustenítico ASTM A351 CN3MN
Gravalos, Márcio Tadeu;Martins, Marcelo;Diniz, Anselmo Eduardo;Mei, Paulo Roberto;
Rem: Revista Escola de Minas , 2007, DOI: 10.1590/S0370-44672007000100013
Abstract: super austenitic stainless steels are denominated as such because they present good resistance to pitting corrosion and, also, offer excellent mechanical properties, which makes them one of the options for the production of components used by the petroleum industry. however, the superficial foundry hardening during the machining processes can change these properties. this paper aimed at investigating the effects of the machining operation on the surface of the super austenitic steel astm a351 cn3mn. samples of the casted steel suffered wear due to cylindrical machining, with different cutting speeds, using indexable carbide inserts of varied geometries. the analysis of the microstructure on the casting surface was accomplished by optical microscopy and the foundry hardened surface was determined by micro-hardness. the mechanical properties of the steel were determined by traction assay. the wear in the cutting inserts was accomplished in a mev.
Influência da rugosidade na resistência à corros?o por pite em pe?as torneadas de a?o inoxidável superaustenítico
Gravalos, Márcio Tadeu;Martins, Marcelo;Diniz, Anselmo Eduardo;Mei, Paulo Roberto;
Rem: Revista Escola de Minas , 2010, DOI: 10.1590/S0370-44672010000100013
Abstract: pitting corrosion resistance has been correlated to the morphological conditions of the surface: a smooth surface finishing decreases the potential for pitting. this study aimed at investigating the relationship between pitting corrosion resistance and surface roughness in the machined surfaces of superaustenitic stainless steel astm a744 grade cn3mn. the samples of the casting steel were cylindrically turned sunder different combinations of cutting conditions, producing different surface roughness patterns. the surfaces of the samples, as machined, were characterized by roughness and hardness. after the application of an accelerated immersion corrosion test, these surfaces were examined in a stereoscope and the weight loss by corrosion was also determined. it was revealed that the samples exhibited different corrosion resistance behaviors, according to the machining conditions applied. a correlation between pitting resistance corrosion and machined surface roughness was evident, and also, the weight loss due to the formation of pits. this study has identified that corrosion can be controlled through the selection of appropriate machining parameters.
Efeitos da adi??o de níquel em ligas ferro-cromo. Parte II: tempo de vida da ferramenta em processo de torneamento
Marques, Daniel Cirillo;Decarli, Célia Cristina Moretti;Bubani, Franco;Barbosa, Celso Antonio;Mei, Paulo Roberto;Diniz, Anselmo Eduardo;
Rem: Revista Escola de Minas , 2007, DOI: 10.1590/S0370-44672007000100011
Abstract: the aim of this work was to study the influence of ni content on coated cemented carbide tool wear during the machining process of stainless alloys. for this purpose alloys were prepared with an 18%cr-0.01%c-0.2%si-0.4%mn base composition and variable ni content (0, 10, 20, 40 and 60 weight %). tests were carried out with coated cemented carbide tools; class m15 with tic/al2o3/tin coating. all alloys were machined under the same process conditions (vc = 230 m/min, ap = 0.6 mm and f = 0.1 mm/rotation), so the only variation source was the ni content. preliminary results indicate that the tool life lowers when ni content rises.
Efeito da temperatura na estrutura e na estabilidade de ligas Fe - 18 Cr - (0 a 60) Ni
Bubani, Franco de Castro;Decarli, Célia Cristina Moretti;Brollo, Gabriela Lujan;Barreto, Edison Henrique;Diniz, Anselmo Eduardo;Mei, Paulo Roberto;
Rem: Revista Escola de Minas , 2010, DOI: 10.1590/S0370-44672010000100008
Abstract: the material studied consists of a series of alloys with a basic composition (weight %): 18cr - 0.01 c - 0.2 si - 0.4 mn, and levels of nickel varying from zero to 60%. alloys in the annealed condition and after deformation at room temperature, 350 and 700°c to simulate the high temperatures achieved during machining were observed by optical microscopy. equilibrium diagrams were generated by computational thermodynamics (thermocalc) to predict the behavior of these alloys in a wide range of temperatures. the theoretical thermodynamic equilibrium conditions of the system were compared to the observed microstructures, indicating that the cfc phase in alloys with nickel content between 10% and 30% is, in fact, in a metastable condition at room temperature. martensitic transformation induced by cold work in the alloy with 10% ni was observed, validating the computer calculations.
Efeitos da adi??o de níquel em ligas ferro-cromo. Parte I: propriedades mecanicas
Bubani, Franco de Castro;Decarli, Célia Cristina Moretti;Marques, Daniel Cirillo;Barbosa, Celso Antonio;Diniz, Anselmo Eduardo;Mei, Paulo Roberto;
Rem: Revista Escola de Minas , 2007, DOI: 10.1590/S0370-44672007000100023
Abstract: the aim of this work was to study the influence of ni additions on the mechanical properties of fe-cr alloys. for this purpose, alloys were prepared with an 18%cr-0.01%c-0.2%si-0.4%mn base composition and variable ni content (0, 10, 20, 40 and 60 weight %). the alloys were characterized by x-ray diffraction and thermal analyses. their hardness was determined before and after cold deformation. tension tests were carried out at room temperature and 350oc to verify the effect of temperature on the mechanical behavior of the alloys. the mechanical characterization aim was to use these figures to correlate mechanical properties and machinability (results originating from a parallel study).
Efeito da temperatura e do teor de níquel nas propriedades mecanicas e a correla??o com usinabilidade em ligas Fe-18Cr-Ni
Bubani, Franco de Castro;Decarli, Célia Cristina Moretti;Brollo, Gabriela Lujan;Barbosa, Antonio Celso;Diniz, Anselmo Eduardo;Mei, Paulo Roberto;
Rem: Revista Escola de Minas , 2010, DOI: 10.1590/S0370-44672010000100031
Abstract: tensile tests were carried out at room temperature in fe-18% cr alloys, with nickel content varying between zero and 60%, and the properties obtained were correlated with the results of machinability previously obtained by the group. the alloys were also tested at 350 and 700°c in order to obtain these properties in the range of temperature compatible with the machining process. the ferritic alloy presented lower elongation and uts (ultimate tensile strength) than austenitic alloys at room temperature and 350°c, which explains why, in the machining process, the ferritic alloy shows much greater tool life if compared to austenitic alloys (100 against 20 to 50 minutes, respectively). in the test at 350°c, the temperature reached during machining, the increase in nickel content increased the uts of austenitic alloys, hampering the machining, and also elevated the ductility (elongation) that produces a higher volume of material adhered on the tool. this higher adhesion capacity, allied to a higher mechanical strength, explains the increase of tool wear as a function of increasing nickel content in the alloy with a consequent reduction in the life of the tool.
Pequenas empresas e desenvolvimento regional
Eduardo Anselmo de Castro
Finisterra - Revista Portuguesa de Geografia , 1986,
Comparing different plunge cylindrical grinding cycles based on workpiece roughness and process vibration
Pereira, Wanderley Xavier;Diniz, Anselmo Eduardo;Hassui, Amauri;
Journal of the Brazilian Society of Mechanical Sciences and Engineering , 2009, DOI: 10.1590/S1678-58782009000200009
Abstract: grinding is an important process used when tight dimensional accuracy and low workpiece surface roughness are demanded. despite the fact that grinding is widely used in industry, it is not well understood. the elastic deformation, which occurs in the beginning of the cycles, makes it necessary a spark out in the end of the cycle. an alternative to this is the use of a three-phase cycle. the main objective of this work is to compare the plunge cylindrical conventional grinding cycle (with spark out) and a three-phase one in terms of workpiece surface roughness. in order to accomplish this goal, several plunge grinding of hardened aisi 4340 steel experiments were carried out using both kinds of cycles in different grinding conditions. the vibration signal of the system was acquired in order to better understand the differences between the two kinds of cycles. the main conclusion was that conventional cycle produces lower workpiece surface roughness than the three-phase one (both with the same cycle time). it happens because the elastic deformation is better released in the conventional cycle.
Tool wear damage caused by abundant emulsion in milling operation of PH stainless steel
Diniz, Anselmo Eduardo;Braghini Júnior, Aldo;Teixeira Filho, Fernando;
Journal of the Brazilian Society of Mechanical Sciences and Engineering , 2008, DOI: 10.1590/S1678-58782008000200005
Abstract: the use of cutting fluid in milling operations causes increase of temperature variation on the tool and may cause decrease of tool life. however, sometimes its use is necessary due to possible deleterious influence the temperature increase may have on the workpiece. therefore, it is important to make fluid less harmful for the tool. in this work, two alternatives were tried: the application of emulsion internally to the tool, forcing it to get closer to the cutting edge and the use of an emulsion with higher concentration, trying to increase the lubrication and decrease the fluid cooling capacity. these alternatives were experimented in the face milling operation of stainless steel used in the aeronautic industry (where workpiece damage must be avoided) and were compared to the usual way of fluid application (externally to the tool and with lower concentration) and also to dry cutting, in two different cutting speeds. tool wear damage was analyzed. the main conclusions were: a) dry cutting generated longer tool lives than cutting with emulsion no matter the way of application and the fluid concentration; b) tool wear mechanism which caused the end of tool life was attrition for dry cutting and cracks and chippings of thermal origin for cutting with emulsion, again, no matter the way of fluid application and the fluid concentration.
Application of cutting fluids in machining processes
Sales, Wisley Falco;Diniz, Anselmo Eduardo;Machado, álisson Rocha;
Journal of the Brazilian Society of Mechanical Sciences , 2001, DOI: 10.1590/S0100-73862001000200009
Abstract: in the last decade a lot has been discussed about the suitability of using cutting fluid in abundance to cool and lubricate machining processes. the use of cutting fluid generally causes economy of tools and it becomes easier to keep tight tolerances and to maintain workpiece surface properties without damages. in the other hand, it brings also some problems, like fluid residuals and human diseases. because of them some alternatives has been sought to minimise or even avoid the use of cutting fluid in machining operations. some of these alternatives are dry cutting and cutting with minimum quantity of fluid (mqf). the main goal of this work is to discuss these tendencies. therefore, topics like kinds and methods of applications of modern cutting fluids and what are new in this area will unavoidably be considered. mqf and dry cutting techniques, their applications and where it is not possible to apply them will also be focused. to exemplify the topics, this work will describe some of the researches been developed in two important brazilian universities: state university of campinas (unicamp) and federal university of uberlandia (ufu).
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