Machining Forces
Mostrando 13-24 de 31 artigos, teses e dissertações.
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13. Estudo teórico-experimental das forças de corte no processo de torneamento / Theoretical and experimental study of cutting forces in turning
O estudo das forças de corte em usinagem tem várias aplicações, tais como definir a melhor geometria da ferramenta e sua interação com a peça. Este trabalho apresenta os resultados de simulações do processo de torneamento utilizando o método dos elementos finitos no corte ortogonal em aço AISI 4340 usando insertos de metal duro, comparando-os com
Publicado em: 2009
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14. Performance evaluation of carbide tools on automotive valve guides reaming / Avaliação do desempenho de ferramentas de metal duro no alargamento de guias de válvulas automotivas
Reaming is a machining process with relatively low cost and suitable when high quality holes are required. The purpose of this work is to evaluate the quality of the holes made in automotive valve guides, fabricated with sintered steel. This study was based on parameters of surface roughness, roundness and cylindricity deviations, obtained with uncoated carb
Publicado em: 2009
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15. A contribution to Ti-6A1-4V titanium alloy face milling / Uma contribuição ao fresamento frontal da liga de titanio Ti-6A1-4V
As ligas de titânio apresentam baixa usinabilidade devido à reduzida condutividade térmica, à manutenção de suas propriedades mecânicas em altas temperaturas, à elevada afinidade química com os materiais de ferramentas e ao baixo módulo de elasticidade. Esta última característica promove instabilidade da espessura de corte, o que se traduz em alt
Publicado em: 2009
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16. Performance profiling of boric acid as lubricant in machining
Turning is a widely used metal removal process in manufacturing industry that involves generation of high cutting forces and temperature. Lubrication becomes critical to minimize the effects of these forces and temperature on cutting tool and workpiece. The conventional cutting fluids employed in machining have certain limitations with regard to their use fo
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2008-09
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17. Experimental inquiry on chip formation in the machining of ABNT 1045 steel and nodular casting iron / Investigação experimental da formação do cavaco na usinagem do aço ABNT 1045 e do ferro fundido nodular
The chip formation is influenced by several cut parameters which also affect the forces, tensions, powers and temperatures generated during the machining process. Although they have been studied for more than 100 years, still today, the involved mechanisms of deformation are not totally know, due to the fact that the chip formation involves high temperatures
Publicado em: 2008
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18. Estudo dos campos de tensão gerados por inclusões durante o processo de torneamento em aços ABNT 1045 utilizando o método dos elementos finitos. / A study of stress fields due to inclusions during turning of ABNT 1045 by using the finite element method.
MnS inclusions are non-metallic compounds formed in steel due to chemical reactions between sulfur and manganese. The formation of MnS inclusions during steel production is generally expected and sometimes desired in steels for machining applications. During machining, the stress concentrating effect due to MnS inclusions is determined by factors such as the
Publicado em: 2008
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19. Evaluation through the mgnetic inspection of the superficial condition of steel bearing rings DIN 100Cr6 after hard and dry turning. / Avaliação através da inspeção magnética da condição superficial de anéis de rolamento de aço DIN 100Cr6 após torneamento duro a seco.
The present work presents information for the manufacturing of ball bearings components with higher limits of resistance to fatigue, enabling a longer useful life and also the optimization of the production of the pieces, making the usual and final process of grinding unnecessary, which would result in a costs reduction. The motivations of this study are the
Publicado em: 2008
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20. Análise dos esforços de corte e acabamento superficial no torneamento de aço com ferramenta de superfície lisa e com quebra-cavaco / Comparative analisys of the cut effort and surface finish in steel turning with grooved and flat tools
Este trabalho apresenta resultados de testes com processo de usinagem para diferentes ferramentas de torneamento. Foram realizados ensaios para avaliar a diferença de comportamento quantoa esforçosde cortee acabamentosuperficialem operaçãode torneamento para um mesmo tipo de ferramenta, com variação na superfície de saída, sendo uma com quebra cavaco
Publicado em: 2008
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21. Influence of the tool edge geometry on specific cutting energy at high-speed cutting
This paper presents specific cutting energy measurements as a function of the cutting speed and tool cutting edge geometry. The experimental work was carried out on a vertical CNC machining center with 7,500 rpm spindle rotation and 7.5 kW power. Hardened steels ASTM H13 (50 HRC) were machined at conventional cutting speed and high-speed cutting (HSC). TiN c
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2007-09
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22. Assessement of tensile strength of graphites by the Iosipescu coupon test
Polycrystalline graphites are widely used in the metallurgical, nuclear and aerospace industries. Graphites are particulated composites manufactured with a mixture of coke with pitch, and changes in relative proportions of these materials cause modifications in their mechanical properties. Uniaxial tension tests must be avoided for mechanical characterizatio
Materials Research. Publicado em: 2007-09
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23. N. Machinability of low carbon free-machining leaded steel ABNT 12L14 with different levels of residual elements (chromium, nickel and cooper) / Usinabilidade do aço de corte-fácil baixo carbono ao chumbo ABNT 12L14 com diferentes níveis de elementos químicos residuais (cromo, níquel e cobre)
The purpose of this thesis was to study the machinability of low carbon free-machining leaded steel (ABNT/AISI 12L14) with different levels of residual (tramp) elements such as chromium, nickel and copper. Nine batches of steel were produced with controlled chemical composition, and with alterations in the mentioned residual levels so as to apply two levels
Publicado em: 2007
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24. Fresamento do aço vhsuper nos estados recozido e temperado com metal duro e cermet
The concept of costs reduction in all the industrial processes has been continually developed aiming to make companies more competitive. In the dies and moulds production chain this concern is not different. Usually, dies and moulds require long machining and polishing times, which represent from 60 to 80% of the production cost. This work aims to investigat
Publicado em: 2007