Listagem por temas:
Escolhendo um título você terá acesso ao arquivo original em Post-Script.
COB31 SISTEMA DE APOIO À DECISÃO NA ESCOLHA DE CONDIÇÕES OPERACIONAIS PARA PROCESSOS DE USINAGEM
Geraldo Accetturi de Araújo
Departamento de Engenharia Mecânica - EPUSP - E-Mail: gaaraujo@usp.br
Mercedes-Benz do Brasil, São Bernardo do Campo.
Nivaldo Lemos Coppini
Departamento de Engenharia Mecânica - EPUSP - Av.Prof. Mello Moraes, 2231, Cid. Universitária
05508-900 - São Paulo, SP E-Mail: coppini@fem.unicamp.br
Process planning is an essential activity in the several stages of the manufacturing cycle and has been developing with the use of CAPP systems, particularly for machining processes. This paper presents the model for a prototype system to aid the planning decisions and intending to obtain the machine, the tool and a theoretical specification of the depth of cut, feed and cutting speed of the process. It was considered aspects like machinability of the part material, secondary and auxiliary manufacturing times, and the logistics applied to the flow of parts at the shop-floor through the definition of the used machine to be or not a production neck beyond its machine capacity. As optimization criterion it was proposed a study of the compromise between cost and manufacturing time for the maximum efficiency interval, with the restrictions of the machine-tool-part set. The system has a practical testing module intended to refine the theoretical values of the adopted cutting speed to garantee its application to the adopted machine and tooling. The system approach is semi-generative, with algorithmic and knowledge based solutions, with a simple and user-friendly interface.
Keywords: Planejamento de processo, CAPP, processos de usinagem, velocidade de corte, otimização de processo.
COB115 ANÁLISE COMPARATIVA ENTRE USINAGEM DE COMPÓSITO PRFC E USINAGEM CONVENCIONAL DOS METAIS / COMPARATIVE ANALYSIS BETWEEN CFRP COMPOSITE MACHINING AND METALS CONVENTIONAL MACHINING
João R. Ferreira (1) , Nivaldo l. Coppini (2) , & Gilberto W. A. Miranda (3) & Flamínio Levy Neto.(4)
(1) Depto. Produção, Escola Federal de Enga. Itajubá-EFEI, Itajubá-MG, E-mail: jorofe@fem.unicamp.br
(2) Depto. Enga. Fabricação, UNICAMP/FEM, Campinas-SP, E-mail: coppini@fem.unicamp br
(3) Depto. Enga. Mecânica, UNITAU, Taubaté-SP, E-mail: arenas@fem.unicamp.br
(4) Depto. de Enga. Mecânica (FT-ENM), UnB, Brasília-DF, E-mail: levy@enm.unb.br
In reason of their characteristics the applications of composite materials based on Carbon Fibre Reinforced Plastic (CFRP) growing considerably. So, new manufacturing process and production techniques must be developed to ensure high precision and good surface quality to the components. In function of this manufacturing scenario, is necessary to study the machining process. This work shows practical experiments in turning of carbon fiber reinforced resin to study the performance of different tool materials like ceramics, cemented carbide, cubic boron nitride (CBN), and diamond (PCD). The tests were carried out with cemented carbide tool in various cutting speeds and feeds. For finish operation were used the PCD tools with positive and negative geometry. During the tests were observed tool wear, machining forces, and main engine power. In function results is done a comparative analysis between CFRP composite machinability in relation ABNT 4340 steel. Finally, the work shows that the cutting conditions optimisation is extremely important in the selection of tools and cutting condition to be used during CFRP manufacturing process.
Keywords: CFRP Composite, Machinability, Tools, Roughness, Machining Forces, Cutting Conditions/
Compósito PRFC, Usinabilidade, Ferramentas, Forças de Usinagem, Condições de Corte.
COB116 ANÁLISE COMPARATIVA ENTRE USINAGEM DE COMPÓSITO PRFC E USINAGEM CONVENCIONAL DOS METAIS / COMPARATIVE ANALYSIS BETWEEN CFRP COMPOSITE MACHINING AND METALS CONVENTIONAL MACHINING
João R. Ferreira(1), Nivaldo l. Coppini(2), & Gilberto W. A. Miranda(3) & Flamínio Levy Neto(4)
(1) Depto. Produção, Escola Federal de Enga. Itajubá-EFEI, Itajubá-MG, E-mail: jorofe@fem.unicamp.br
(2) Depto. Enga. Fabricação, UNICAMP/FEM, Campinas-SP, E-mail: coppini@fem.unicamp br
(3) Depto. Enga. Mecânica, UNITAU, Taubaté-SP, E-mail: arenas@fem.unicamp.br
(4) Depto. de Enga. Mecânica (FT-ENM), UnB, Brasília-DF, E-mail: levy@enm.unb.br
In reason of their characteristics the applications of composite materials based on Carbon Fibre Reinforced Plastic (CFRP) growing considerably. So, new manufacturing process and production techniques must be developed to ensure high precision and good surface quality to the components. In function of this manufacturing scenario, is necessary to study the machining process. This work shows practical experiments in turning of carbon fiber reinforced resin to study the performance of different tool materials like ceramics, cemented carbide, cubic boron nitride (CBN), and diamond (PCD). The tests were carried out with cemented carbide tool in various cutting speeds and feeds. For finish operation were used the PCD tools with positive and negative geometry. During the tests were observed tool wear, machining forces, and main engine power. In function results is done a comparative analysis between CFRP composite machinability in relation ABNT 4340 steel. Finally, the work shows that the cutting conditions optimisation is extremely important in the selection of tools and cutting condition to be used during CFRP manufacturing process.
Keywords: CFRP Composite, Machinability, Tools, Roughness, Machining Forces, Cutting Conditions/ Compósito PRFC, Usinabilidade, Ferramentas, Forças de Usinagem, Condições de Corte.
COB120 EFEITO DO ENXÔFRE (UM ADITIVO E.P.) NA LUBRIFICAÇÃO EM USINAGEM / EFFECT OF SULPHUR (AN E.P. ADDITIVE) ON LUBRICATION IN MACHINING
Marcio Bacci da Silva1 & Jim Wallbank2
1Universidade Federal de Uberlândia, Departamento de Engenharia Mecânica, Uberlândia/MG, 38400-089, Brazil
E-mail: esrng@eng.warwick.ac.uk
2University of Warwick, Department of Engineering, Coventry, CV4 7AL, UK
This work considers three different lubrication conditions: air (dry), oil and oil with sulphur. Air is a good lubricant as it reacts with surfaces to forms oxides that prevent the adhesion. When the forces and temperatures are low, an oil can penetrate between the two surfaces and lubricate the contact. An E.P. additive is suitable when the temperatures are enough to promote its reaction with the surface to form a layer to protect them, as is the case of metal cutting. The effect of the different lubrication condition are measured by cutting forces, surface roughness and temperature. The machining operation was turning of an AISI 1040 steel. The sulphur affect the performance of the oil in respect to workpiece temperature, but the cutting force are affected only for some conditions. The effect on the temperature are due the lubrication action of the oil with sulphur and built up edge formation.
Keywords: Lubrificação; Fluido de corte; Temperatura de corte; Usinagem/Lubrication; Cutting fluid; Cutting temperature; Machining
COB130 MONITORAMENTO DO TORNEAMENTO DE AÇOS ENDURECIDOS USANDO EMISSÃO ACÚSTICA E CORRENTE DO MOTOR / MONITORING OF HARD TURNING USING ACOUSTIC EMISSION AND MOTOR CURRENT
Hidekasu Matsumoto (1) e Anselmo Eduardo Diniz(2)
(1) Departamento de Engenharia Mecânica, Faculdade de Engenharia - UNESP - Ilha Solteira - CEP: 15.385-000, Ilha Solteira - SP, Brasil - E-mail:hidekasu@dem.feis.unesp.br
(2) Departamento de Engenharia de Fabricação, Faculdade de Engenharia Mecânica - UNICAMP - Campinas-SP, Brasil - E-mail: anselmo@fem.unicamp.br
Several turning experiments were carried out in quenched AISI E52100 steel with average hardness of 60 HRc, using blended ceramic tool material. A 22 kW CNC lathe was used and acoustic emission and electrical current of the main machine motor were monitored in real time, aiming to indirectly determine the end of tool life. When the workpiece surface roughness reached Ra = 0.6 mm, the experiment finished and the tool was replaced. This value of Ra was used because it is a typical surface roughness value for grinding and the main goal of hard turning process is to replace grinding process. The results point out that, due to the low value of flank wear allowed to the tool in order to not pass this surface roughness, the 2 monitoring methods used are not suitable for establishing the end of tool life without further signal conditioning.
Keywords: Hard Turning, Ceramic Tools, Tool Wear, Tool Monitoring, Sensor, Machining. Torneamento de Aços Endurecidos, Monitoramento, Usinagem, Sensores, Ferramentas Cerâmicas.
COB140 A VIDA DAS FERRAMENTAS NA USINAGEM DA MADEIRA DE "EUCALYPTUS GRANDIS" NOS ESTADOS VERDE E SECO / AISI D-6 STELL AND STELLITE-1 TOOL LIFE DETERMINATION IN THE "EUCALYPTUS GRANDIS" WOOD MACHINING
Wiili Johann Gottlob & Rosalvo Tiago Ruffino
Departamento de Engenharia Mecânica, Faculdade de Engenharia - UNESP - Bauru CEP17033-360 Bauru, Brasil - E - mail : gottlob@bauru.unesp.br
Departamento de Engenharia Mecânica, Escola de Engenharia de São Carlos - USP - São Carlos CEP 13560-970 São Carlos, Brasil - E- mail: rruffino@sc.usp.br
Two tool materials were tested at the same time: the steel AISI D-6 and the stellite-1. The wet and the air dried "Eucalyptus grandis" wood were machined with the following cutting speed: 25,4 - 35,0 - 42,6 and 50,5 m/s. The test was carried out in a molding machine, on which we set up a built tool holder and attached a feeder for the wood beams with stepless regulation speed. With regard to the two tool materials tested over tens of kilometers of cutting lengths, in the wet or the air dried wood machining, it was the stellite-1 tool material that showed a better performance in the wet, as well as in the air dried wood machining. The experimental outcome showed different trends, as to the life of the tools. The plots of the tool life for the air dried wood are bent downwards, that is, for the lower cutting speeds the tool life lasts longer. From a certain value of speed, the tool life falls, while for the wet wood machining the tool life bends upwards, that is, by increasing the cutting speed value a little bit, the tool life decreases, whereas, from a certain value of the cutting speed, the tool life stabilizes.
Keywords: Wood working, Wood machining, Tool wear / Processamento da madeira, Usinagem da madeira, Desgaste de feramentas
COB141 UM SISTEMA AUXILIADO POR COMPUTADOR PARA DETERMINAR O DESGASTE DAS FERRAMENTAS NA USINAGEM DA MADEIRA / A COMPUTER AIDED PROCESS TO DEFINE THE TOOL WEAR IN WOOD MACHINING
Wiili Johann Gottlob & Rosalvo Tiago Ruffino
Departamento de Engenharia Mecânica, Faculdade de Engenharia - UNESP - Bauru CEP17033-360 Bauru, Brasil - E - mail : gottlob@bauru.unesp.br
Departamento de Engenharia Mecânica, Escola de Engenharia de São Carlos - USP - São Carlos CEP 3560-970 São Carlos, Brasil - E- mail : rruffino@sc.usp.br
Because of the difficulty in measuring the wear of the saw teeth and other wood cutters and because of the inaccuracy of the use of an optical measuring projector for that purpose, we developed a tool holder with twelve holes to hold the tools in the same direction of the axis, forming an end mill, which would be applied at a molding machine. We also built up a system to measure the tool wear using a coordinate table, two digital electronic measuring instruments, a multiplexer and a computer constituting a profile analyzer. The tool wears were measured for tool machining definite cutting length, for instance 10 km, 25 km, 40 km, and so on. After having obtained the wears which took place along the cutting edge from the vertex with a step of 0,1 mm until its useful length (3,0 to 3,5 mm), we built the edge wear graphs showing the evolution of the tool edge wear. We concluded that the built tool holder and the wear measurement system used were accurate and suitable. With such a system, it is possible to have a great amount of information, in regard to the tool wear inside a computer.
Keywords: Wood working, Wood machining, Tool wear / Processamento da madeira, Usinagem da madeira, Desgaste de ferramentas.
COB144 OPTIMIZACIÓN DEL MECANIZADO DE Ti-6Al-4V Y Ni-19Cr-19Fe-Nb
Joseba Pérez Bilbatua, Norberto López de Lacalle, José Antonio Sánchez & José Ignacio Llorente
Departamento de Ingeniería Mecánica, Escuela Técnica Superior de Ingenieros Industriales C/ Alameda de Urquijo s/n, 48013 Bilbao, España - email : imvpebij@bi.ehu.es
This paper describes several aspects on the Titanium based Alloys and Nickel based alloys machining technology, its role in the aeronautical industry, as well as their properties, disadvantages and the efforts carried out in the optimization of the conventional machining process (modifying the cutting parameters, tool materials, geometry, and other parameters involved in the process). This paper also describes different aspects related to using coated tools (TiCN, TiN, CrN) in the machining of titanium alloys, in order to protect cutting edges against flank wear.
Keywords: Mecanizado, Ti-6Al-4V, Ni-19Cr-19Fe-Nb, Aeronáutica, Fresas, Recubrimientos
COB146 TOOL LIFE OF PCBN AND CERAMIC CUTTING TOOLS WHEN TURNING HARDENED AISI E52100 STEEL
Alexandre Mendes Abrão
Departamento de Engenharia Mecânica, Escola de Engenharia - UFMG - Av. Antônio Carlos, 6627, Pampulha, Belo Horirzonte MG, CEP 31.270-901 - e-mail:abrao@vesper.demec.ufmg.br
David Keith Aspinwall
School of Manufacturing & Mechanical Engineering and IRC in Materials - Univeristy of Birmingham - Edgbaston, B15 2TT, Birrmingham UK, email: dkaspinwall@bham.ac.uk
The paper investigates the tool life of two grades of polycrystalline cubic boron nitride tools (high and low CBN content) and three grades of ceramic tools (mixed alumina, whisker reinforced alumina and silicon nitride-based ceramic) when continuous turning AISI E52100 bearing steel (62 HRC). The tests were conducted over a range of cutting parameters involving roughing and finishing conditions. A tool life criterion was established for an average flank wear of VBB=0.3 mm and the surface roughness of the machined surface was monitored throughout the test programme. The results indicated that, in general, longest tool lives were obtained when machining using the mixed alumina and low content PCBN tools, followed by the whisker reinforced alumina, high content PCBN and finally silicon nitride-based ceramic (which presented the poorest performance). Surface finish values as low as Ra=0.14m m were obtained under finishing conditions.
Keywords: Machining, Hardened Steels, PCBN and Ceramic Tools, Tool Life.
COB1009 CARACTERÍSTICAS DE DESGASTE E AVARIAS EM FERRAMENTAS CERMET NO TORNEAMENTO DE AÇO ABNT 1045 WEAR AND BREAKAGE CHARACTERISTICS ON CERMET CUTTING TOOLS IN TURNING AISI 1045 STEEL
Lourival Boehs, Luiz Airton Consalter & Rodrigo Panosso Zeilmann
Departamento de Engenharia Mecânica, Centro Tecnológico, UFSC - CEP 88.040-900 Florianópolis, Brasil
E-mail: lb@grucon.ufsc.br, lac@grucon.ufsc.br, zeilmann@labmat.ufsc.br
In spite of the technological evolution of the cutting tool materials which took place in the last years, and their greater range of application, as is the case of CERMET tools, it still occurs some breakage and wear that contradict the usual expectations concerning their application, which reduces the reliability of the recommended data obtained through wear measurements. The present work is concerned with turning of ABNT 1045 steel with last generation CERMET tools, and it reveals the presence of permanent adhesion on the tool/part interface, and the occurrence of macrochipping of the tool edges. In the first case, it is estimated that there is a source that intensifies the temperature, whereas in the second case it is believed that there is a disintegrating effect of the unused tool edges due the mechanical action of the chips. Based on physical, metallurgical and mechanical analyses of these occurrences, this work aims to contribute for the elucidation of apparently non-typical characteristics of wear and breakage, as well to discuss the risk of incorrect selection of cutting tools based on generalized recommendations.
Keywords: CERMET, Turning, Cutting Tools, Wear / Torneamento, Ferramentas de Corte, Desgaste.
COB1026 ESTUDOS PARA DETERMINAÇÃO DAS CARACTERÍSTICAS DE UMA GUIA E SEU DIMENSIONAMENTO / Studies for Determination of the Guideways’ Characteristics and Its Design
Hugo Marcelo B. de Carvalho, Noemia Gomes de M. de Mesquita
Departamento de Engenharia Mecânica, Centro de Tecnologia e Geociência - UFPE -Recife
CEP 50740 - 530 Recife, Brasil - E-mail:hugombc@npd1.ufpe.br, ngmm@npd1.ufpe.br
The guideways are elements that influence directly the precision of manufacturing. This paper recommends techniques to increase this precision, using guideways combing sliding/rolling to the turn process. It’s necessary to know the error that occur in this process and also to specify the profile of the surface of the guideways to decrease the wear and the probability of surface fatigue.
Keywords: Machining, precision, guideways, tribology,. wear
COB1027 ESTUDO DO COMPORTAMENTO DE REBOLOS DIAMANTADOS, COM LIGANTE RESINÓIDE, NA RETIFICAÇÃO DE CERÂMICAS AVANÇADAS PELA GEOMETRIA DO CAVACO GERADO / STUDY OF THE BEHAVIOR OF DIAMOND GRINDING WHEELS WITH BONDED RESIN, IN THE GRINDING OF MODERNS CERAMICS BY THE GEOMETRY OF THE CHIP GENERATED.
Eduardo Carlos Bianchi*, Carlos Elias da Silva**, Galdino Ferreira de Souza***, Carlos Alberto Fortulan****, Odilson Coimbra Fernandes*, Ivan De Domenico Valarelli*, Paulo Roberto de Aguiar*
* UNESP – Faculdade de Engenharia e Tecnologia - Bauru - Av. Eng. Luiz Edmundo Carrijo Coube, S/No ,17033-360 - Bauru - SP - E-mail: bianchi@bauru.unesp.br
**Mestrando em Engenharia Mecânica pela EESC - USP
***Diretor presidente da empresa Master Diamond Ferramentas Diamantadas
****Doutorando em Engenharia Mecânica pela EESC – USP
The aim of this work is to study the behavior of the plan tangential grinding process with diamond grinding wheels. The analysis of the grinding performance was done regarding the cutting surface wear behavior of the grinding wheel for ceramics workpieces. The results discussion emphasized the wear mechanism of the grinding wheel cutting surface and the cutting phenomenology of the grinding process.
Keywords: Retificação de cerâmicas avançadas, rebolos diamantados, desgaste de rebolos, relação G
COB1028 ESTUDO DA RUGOSIDADE SUPERFICIAL DE EIXOS DE LIGAS LEVE PARA UTILIZAÇÃO EM MANCAIS AEROSTÁTICOS / STUDY OF AXLES SURFACE FINISH OF LIGHT ALLOY FOR UTILIZATION IN AEROSTATICS BEARING
Luiz Daré Neto, Eduardo Carlos Bianchi & Odilson Coimbra Fernandes
Depto. de Engenharia Mecânica da Faculdade de Engenharia e Tecnologia – UNESP – Bauru, CEP 17033-360 Bauru, Brasil
E-mail: ldaren@bauru.unesp.br
The objective of this work is to study the possibility of producing aluminum axles in order to utilize thim in aerostatic bearings, using the turning process. Therefore it analysis the roughness produced by the two types of insert tungsten carbide, in several condition of machining.
Keyword: Aerostatic Bearing; Surface Finish, Surface Roughness on Turned Aluminum
Mancais Aerostáticos, Acabamento Superficial, Rugosidade Superficial no Torneamento de Alumínio
COB1030 INFLUÊNCIA DA GEOMETRIA TEÓRICA DO CAVACO NA POTÊNCIA DE CORTE, NO ACABAMENTO SUPERFICIAL E NO DESGASTE DE REBOLOS / INFLUENCE OF THE TEORICAL GEOMETRY OF THE CHIP IN THE CUTTING POWER, IN THE SURFACE FINISH AND IN THE WHEEL WEAR
Odilson Coimbra Fernandes, Eduardo Carlos Bianchi, Carlos Elias da Silva
UNESP – Faculdade de Engenharia e Tecnologia - Bauru - Av. Eng. Luiz Edmundo Carrijo Coube, S/No ,17033-360 - Bauru - SP
Grinding operations are influenced by a large number of variables. These make it difficult for the operator to choose the ideal working conditions in order to attain the desired objective. An experimental study of the influence of geometry of the generated chip, with respect to the cutting power, surface finish and wear of the grinding wheel manufactured using three types of vitrified bonding material and two types of abrasive grain, was made. Six types of grinding wheel and sample ground work pieces made of ductile steel (ABNT 1020) and fragile steel (ABNT 1045 quenched) were used. By using a tangential grinding process, the cutting speed parameter was maintained constant and the work piece speed and the grinding wheel penetration were varied, in order to work with two constant values of the equivalent chip thickness. Also, for all the cases the same grinder dressing was used. The results are presented in tables which consider different entry parameters, varying the type of grinding wheel and test piece material. The wear of the grinding wheel is discussed based on tables of the G ratio. Finally, a comparison was made between output variables, involving the six tests simultaneously, for each value of the equivalent chip thickness.
Keywords: Grinding; Chip geometry; Grinding wheel wear, Vitrified bond; Abrasive grain
COB1083 ROSQUEAMENTO POR USINAGEM EM FERRO FUNDIDO NODULAR / CUTTING TAP IN GLOBULAR CASTING IRON
Walter Lindolfo Weingaertner & Hewerson Raniére da Silva
Laboratório de Mecânica de Precisão – Departamento de Engenharia Mecânica UFSC
Cx. P. 476 - EMC - CEP 88.040-600 Florianópolis, Brasil
Franz Tikal & Christian Vollmer
Instituto für Produktionstechnik und Logistik - IPL/ GhK, Kurt-Wolters-Str. 3 Plz. 34.125 Kassel – Deutschland - Alemanha,
E-mail : cvollmer@hrz.uni-kassel.de
The Institut of Production Technics and Logistic from Germany has developed a German Society of Research–Project, whose topic was the investigation of the behavior of coating taps with a determinated geometry in casting iron from types GGG 40 and GGG 60. Two parameters were varied: the type of cutting fluid introduction (external or through the tool) and the tool spin angle (15o or 40o). The used cutting speeds have created a new limit for the high speed cutting tap tools, mainly in GGG 40. This work shows how these researches were made and which parameters must be considered for the right analysis of this manufacturing process.
Keywords: macho de rosquear, ferro fundido, introdução de fluido de corte, ângulo de hélice, velocidade de corte
Cutting Tap, casting iron, cutting fluids introduction, tool spin angle, cutting velocity
COB1084 ASPECTOS TECNOLÓGICOS DO DESENVOLVIMENTO DA FURAÇÃO POR ESCOAMENTO / TECHNOLOGICAL ASPECTS ON THE DEVELOPMENT OF THE FLOWDRILLING
Walter Lindolfo Weingaertner, João Carlos Oliveira Lopes, Daniel Carlos da Silva, Otacílio Cardoso Duarte Filho, Cristiano Rafael Schramm, Gerson Ismael de Souza, Manfred Molz
Laboratório de Mecânica de Precisão - EMC – UFSC, Campus Universitário Trindade - CP 476 EMC, Florianópolis - SC , E-mail :
Franz Tikal, Roland Heiler
Instituto für Produktionstechnik und Logistik - IPL – GhK, Kurt-Wolters-Str. 3 - 34 125, Kassel – Deutschland,
E-mail : heiler@hrz.uni-kassel.de
Flowdrilling is a relative new manufacturing process for bush forming. A cemented carbide tool with special geometry is used on standard drilling machines to produce bushes in thin metal sheets, without chip removal. After the drilling process a cold forming tap is used to generate the thread in these bushes by plastic deformation. A threaded bush is then used like a sheet metal joint in many applications. This work is about new research topics which have been developed in a co-operation between the Laboratório de Mecânica de Precisão/UFSC, from Florianópolis - Brazil, and the Institut für Produktionstechnik und Logistik/GhK from Kassel – Germany. These topics are concerned about the deformation process of the sheet material, development of new materials for the tools, microstructure analysis of the sheet material and development of some applications of this technology.
Keywords: Furação por escoamento, rosqueamento por conformação, deformação, materiais, chapas metálicas.
Flowdrilling, flowtapping, deformation, materials, sheet metal.
COB1087 PROJETO CONCEITUAL DE UMA RETIFICADORA PARA OBTENÇÃO DE SUPERFÍCIES COM QUALIDADE SUB-MICROMÉTRICA
Walter L. Weingaertner, Milton Pereira, Rodrigo L. Stoeterau & Ricardo M. Peres
Laboratório de Mecânica de precisão, Departamento de Engenharia Mecânica - UFSC, CEP 88010 - 970 Campus Universitário, Trindade, Florianópolis - SC Caixa Postal 476, E-mail: lmp@labmat.ufsc.br
This paper presents the conceptual design of a plain grinder which will work with workpieces in steel or not, working in a range under 1 m m, like metalic reflective surfaces. At first, the design process looks for the machine tool requirements and their evaluation. After this, based on a function structure, a detailed study of all machine components is made, generating a final conception of the grinder.
Keywords: Precision Grinding, Conceptual Design, Function structure, QFD.
COB1088 DESENVOLVIMENTO DE UMA RETIFICADORA PARA A USINAGEM DE LIMAS ENDODÔNTICAS
Walter L. Weingaertner, Durval João De Barba Jr.
Laboratório de Mecânica de precisão, Departamento de Engenharia Mecânica - UFSC, CEP 88010 - 970 Campus Universitário, Trindade, Florianópolis - SC Caixa Postal 476, E-mail: lmp@labmat.ufsc.br
This paper shows the conceptual project and the functional model conception of a machine tool for the grinding of root canal files type hedströem. Initially there is a brief look on the reamers characteristics for the determination of the grinding process kinematics, so to determine a pre-conception. After that, through QFD, a classification of the project specifications for the machine is obtained, which combined with its functions structure, determines the grinder conception. To prove that the grinding process for obtaining reamers is proper for the small dimensions of the work piece (less than 1 mm in diameter), a functional model is set.
Keywords: Retificação de pequenos diâmetros, projeto conceitual, estrutura de funções, modelo funcional.
Prof. Dr.-Ing. Walter Lindolfo Weingaertner*, Eng.a Flávia Andréa Modesto**, Ariovaldo Canani Wiggers* & Artur Santa Catarina*
*Laboratório de Mecânica de Precisão - Universidade Federal de Santa Catarina, Caixa Postal 476-EMC - Campus Universitário - Trindade - 88010-970 - Florianópolis - SC, Fone: (048)234-5277; Fax: (048)234-1519 - E-mail: lmp@labmat.ufsc.br
**Departamento de Engenharia de Materiais - Universidade Estadual de Ponta Grossa, Rua Nabuco de Araújo, 469 - Campus Uvaranas - Bloco L - 84031-510 - Ponta Grossa - PR, Fone/Fax: (042)223-9355 r38 - E-mail: flavia@emc.ufsc.br
In the last 30 years, the interest in ceramic materials increased as a result of significant advances in their development and usage, mainly because ceramics are superior to other materials in terms of stability at elevated temperatures and under wear conditions. However, the same properties that make ceramics so attractive for special uses, such as its hardness, preclude the most tradicional machining techniques. The green machining method is a solution for this problem and shows many advantages in terms of flexibility and economy.This paper shows the green machining of advanced ceramics parts using a innovative method with diamond wire.
Keywords: Usinagem a verde, fio diamantado com movimento alternante, usinagem de cerâmica, usinagem abrasiva.
COB1090 BROCAS HELICOIDAIS: INFLUÊNCIA DOS ERROS DE AFIAÇÃO NA QUALIDADE DOS FUROS / TWIST DRILL: INFLUENCE OF THE INCORRECT SHARPENING ON THE HOLES QUALITY
Cleiton Rodrigues Teixeira
Departamento de Materiais e Construção - Fundação Universidade do Rio Grande, Caixa Postal 474, CEP 96201-900, Rio Grande–RS
Walter Lindolfo Weingaertner
Departamento de Engenharia Mecânica – Universidade Federal de Santa Catarina, Caixa Postal 476, CEP 88010-970, Florianópolis–SC
Due to their complex geometry and elevated level of difficulty to obtain symmetry of the drill (point angle, clearance angle, relief angle and chisel edge angle), twist drills often present geometric errors derived from the sharpenning operations. This geometric errors affect directly the drill performance during cutting. This work identifies the main errors and develop studies of their influence on the drilling operation.
Keywords: Furação, Brocas helicoidais, Erros geométricos, Geometria, Qualidade dos furos / Drilling, Twist drills, Geometric errors, Geometry, Holes quality.
COB1417 ESTUDO DO COMPORTAMENTO DE DIAMANTES NATURAIS E SINTÉTICOS, UTILIZADOS NA FABRICAÇÃO DE PONTAS ESCARTÁVEIS EM ODONTOLOGIA / STUDY OF NATURAL AND SYNTHETIC DIAMONDS’S BEHAVIOR, UTILIZED TO MAKE DISPOSABLE BURS
Eduardo Carlos Bianchi *, Fabio Andreassa Guedes Cezar *, Eraldo Jannone da Silva *, Paulo Roberto de Aguiar *, Ana Rita Rodrigues Bianchi **, César Antunes de Freitas **
* UNESP - FET - Bauru - Departamento de Engenharia Mecânica - Av. Eng. Luiz Edmundo Carrijo Coube, S/No ,17033-360 - Bauru - SP
E-mail: bianchi@bauru.unesp.br
** USP - Universidade de São Paulo - Bauru - Departamento de Materiais Dentários - Rua Al. Octávio Pinheiro Brisola, 9-75,
17043-101 - Bauru - SP
Eight distincts abrasives diamonds were used to made diamonds burs. Each diamond burs was researched to assign the best type of diamond to be used in rotatory dental diamonds instruments. In the tests, glass was grinding, while the tangential force of cut was taken in real time by computer. The best type of diamond was that could remove more material until a determined maximal tangential force of cut was hit. The economics and health aspects have also been pondered. Thus, the best type of diamond was that proved at the same time the best conditions to remove material and the least price, enabling the fabrication of disposable diamonds burs.
Keywords: Tipos de diamante, pontas diamantadas, instrumentos dentários diamantados, diamond, diamond burs