Cutting Speed
Mostrando 13-24 de 110 artigos, teses e dissertações.
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13. Surface Integrity Analysis in Machining of Hardened AISI 4140 Steel
This study aimed to analyze the residual stresses and roughness in finishing milling of AISI 4140 steel, quenched and tempered up to hardness of 58 HRC. Machining operations were performed with the use of CBN inserts and by varying three basic cutting parameters (cutting speed, feed per tooth and cutting depth). Hardened materials are typically machined by a
Mat. Res.. Publicado em: 23/01/2017
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14. Machinability Evaluation in Hard Milling of AISI D2 Steel
Milling of hardened steel components provides considerable benefits in terms of reduced manufacturing cost and time compared to traditional machining. Temperature variation in milling is an important factor affecting the wear of cutting tools. The poor selection of milling parameters may cause excessive tool wear and increased work surface roughness. Hence,
Mat. Res.. Publicado em: 01/03/2016
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15. Analysis of surface roughness and hardness in titanium alloy machining with polycrystalline diamond tool under different lubricating modes
The present work deals with the investigation on machining of difficult-to-machine material titanium alloy (Ti-6Al-4V) using poly crystalline diamond (PCD) tool under different coolant strategies, namely dry, flooded and MQL. Taguchi technique has been employed and the optimization results indicated that MQL lubricating mode with cutting speed of 150 m/min,
Mat. Res.. Publicado em: 15/08/2014
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16. A review of three decades of research on some combinatorial optimization problems
This paper presents an overview of our research in combinatorial optimization problems. Over the last three decades, our team has been studying mostly optimization problems that arise in industrial environments through the elaboration and solution of mathematical decision models. In addition to elaborating innovative models, we have improved upon existing so
Pesqui. Oper.. Publicado em: 2013-04
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17. Eficiência de corte de instrumentos rotatórios de níquel-titânio para alargamento cervical de canais radiculares : análise em estereomicroscopia, perfilometria e microtomografia computadorizada
This study aimed to: evaluate, using different methods and substrates, the cutting efficiency of nickel-titanium rotary instruments for coronal flaring; investigate the influence of rotational speed and number of uses on the cutting efficiency of such instruments; observe the presence of surface defects. First, bovine dentin blocks (n=20) and acrylic blocks
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 07/11/2012
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18. Emprego de ferramentas estatísticas para avaliação da usinabilidade de ligas de alumínio
The main objective of the present work is to study the effect of the input variables: mechanical properties of the workpiece (tensile strength, hardness and elongation) and cutting conditions (cutting speed, feed rate, depth of cut and lubri-cooling system) over the output variables: cutting forces, power consumption, cutting temperature, surface roughness (
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/05/2012
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19. Influência do teor de silício na usinabilidade da liga de alumínio 6351 - avaliada através de força de corte e acabamento superficial / Influence of the silicon content in the machinability of the 6351 aluminium alloy analysed through cutting force and surface finish
The aim of this work is to study the effect of silicon content in the machinability of CBAs (Compania Brasileira de Aluminio) 6351 aluminum alloy measured through cutting force and surface finish. In a first moment the effect of depth of cut (ap), cutting speed (vc), feed rate (f) and silicon content (% Si) on the machinability were investigated. The machini
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/03/2012
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20. Analysis of the cutting conditions influence on the finish of hardened steels using high speed milling / Análise da influência das condições de corte sobre o fresamento em acabamento de aços endurecidos usando altas velocidades
Normalmente, a utilização de aços ferramenta endurecidos, juntamente com as formas complexas típicas das peças utilizadas na área de moldes e matrizes, oferecem dificuldade na usinagem por fresamento, principalmente nas operações de acabamento que exijam o uso de ferramentas longas. A técnica de fresamento HSM (High Speed Machining - usinagem em alt
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/02/2012
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21. Estudo da influência da força de corte em usinagem a verde nas propriedades mecânicas de cerâmicas sinterizadas / Influence of the cutting force of green machining on the mechanical properties of sintered ceramics
The present study deals with the measurement forces of green machining ceramics and their correlation with the mechanical properties after sintering. The green machining is employed in crude compacts either to check raw formats without compromising the extreme dimensional accuracy or to obtain a preform prior to finish machining after sintering, extensively
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 13/01/2012
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22. Slip-line metal cutting model with negative rake angle
A small dead region is seen in front of the rake face of the tool during cutting with negative rake. The lack of knowledge about the stagnant region in the cutting with negative rake requires researching new models. In this work, cutting mechanism of the metal cutting with negative rake angle tools and the stagnation zone formation were studied. A model was
J. Braz. Soc. Mech. Sci. & Eng.. Publicado em: 2012-09
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23. Optimization of end milling parameters under minimum quantity lubrication using principal component analysis and grey relational analysis
Machining is the major reliable practice in accomplishment of metal cutting industries. The accelerated growing competition demands top superior and large quantity with low cost products. Metal working fluids have significant fragment of manufacturing cost and causes ecological impacts and health problems. This work attempts to advance a competent machining
J. Braz. Soc. Mech. Sci. & Eng.. Publicado em: 2012-09
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24. Selection of optimal process parameters for minimizing burr size in drilling using Taguchi's quality loss function approach
The exit burr in drilling degrades the precision of products and causes additional cost of deburring. Therefore, it is essential to minimize burr size at the exit of holes in drilling at the manufacturing stage. Taguchi's quality loss function approach, a multi-response optimization method, has been employed to determine the best combination values of cuttin
J. Braz. Soc. Mech. Sci. & Eng.. Publicado em: 2012-09