Cbn
Mostrando 1-12 de 66 artigos, teses e dissertações.
-
1. Conteúdos Jornalísticos nas Redes Sociais: o cenário das transmissões ao vivo no Facebook em Campo Grande, MS
Resumo: Este trabalho analisa o cenário das transmissões ao vivo de conteúdos jornalísticos no Facebook em Campo Grande, MS. Para isso, foram avaliados o CBN Campo Grande, da FM 93,7, e o Jornal da Tarde, da TV O Estado MS-OE10. Como resultados preliminares do processo, ainda recente na imprensa local, o destaque é o uso do potencial de alcance das rede
Interações (Campo Grande). Publicado em: 05/12/2019
-
2. Aplicação da técnica de CAMQL na retificação cilíndrica externa do aço AISI 4340 utilizando rebolo de CBN
RESUMO O processo de retificação possui como características o bom acabamento superficial e alta precisão dimensional e geométrica. Assim, peças usinadas por este processo possuem um alto valor agregado por se tratar de um processo de acabamento que é comumente realizado nas últimas etapas da fabricação. Um fator limitador do processo de retificaç
Matéria (Rio J.). Publicado em: 16/09/2019
-
3. Surface Integrity Analisys in the Hard Turning of Cemented Steel AISI 4317
This work was based on the surface integrity analysis of hardened steel, AISI 4317 case carburized, quenched and tempered with 58 HRC, obtained by a turning operation executed with CBN (cubic boron nitride) tool, varying three basic cutting parameters (cutting speed, feed rate and cutting depth). The surface integrity characterization was conducted analyzing
Mat. Res.. Publicado em: 26/07/2018
-
4. Evaluation of the oil flow using the MQL technique applied in the cylindrical plunge grinding of AISI 4340 steel with cbn grinding wheel
Abstract The grinding process is defined as an abrasive cutting action of a tool known as grinding wheel, which is submitted to high rotations, promoting excellent finishing and accuracy in dimensions, respecting the parameters established in each project. During the machining, the cutting edges of the abrasive grains undergo wearing and this increases the c
REM, Int. Eng. J.. Publicado em: 2018-07
-
5. Influence of water in the MQL technique in the grinding of steel AISI 4340 using CBN wheels
Abstract Usually, machining employs cooling methods to avoid high temperatures. In most cases, the cutting fluid is applied with high flow and low pressures. This technique consumes a large amount of cutting fluid that causes serious problems in the environment and in the health of the worker. An alternative to the conventional cooling method is the Minimum
REM, Int. Eng. J.. Publicado em: 2018-07
-
6. Avaliação do diafragma piezelétrico de baixo custo no monitoramento do processo de retificação plana tangencial
RESUMO Os processos de usinagem são de extrema importância para a fabricação de peças mecânicas, as peças exigem alta precisão dimensional e geométrica e qualidade em sua construção. Dentre os processos de usinagem, o processo de retificação se destaca por ser um dos processos mais usado, por sua precisão e bom acabamento. É essencial que se c
Matéria (Rio J.). Publicado em: 02/10/2017
-
7. 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
-
8. Investigation on the Effect of Different Pre-Cracking Methods on Fracture Toughness of RT-PMMA
Abstract In this study, eight techniques including coping saw, metal slitting saw, razor blade, cubic boron nitride (CBN) disc, scoring, die-cutting and guillotining, diamond disc, and laser cutting methods were used to produce pre-cracked fracture toughness (Kc) test specimens made of poly(methyl methacrylate)/graft-acrylonitrile butadiene styrene blends. T
Lat. Am. j. solids struct.. Publicado em: 2016-11
-
9. Utilization of minimum quantity lubrication (MQL) with water in CBN grinding of steel
The use of cutting fluids is fundamental to machining processes, mainly when it comes to high heat generation, which is the case of grinding. Thus, lubrication and cooling provided by cutting fluids improve the final quality of the workpiece. However, cutting fluid usage provide some drawbacks concerning environmental, costs and health issues. Therefore, new
Mat. Res.. Publicado em: 08/10/2013
-
10. Crescimento e propriedades vibracionais de cristais a base de Ãxidos / Growth and Vibrational Properties of Oxide Crystals
In this work we used different experimental techniques to study four different series of inorganic oxide crystals, namely: (i) congruent lithium isotope niobate (C7LN), (ii) rare-earth doped mixed vanadates ((Nd,Yb):YxGd1-x(VO4)); (iii) alkali metal doped and pure calcium barium niobates (CaxBa1-xNb2O6); and (iv) potassium tantalite niobate (KTa1-xNbxO3). Be
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/03/2012
-
11. Avaliação de diferentes ferramentas no torneamento da liga Inconel 713C / Evaluation of different tools in turning of Inconel 713C
The super alloy Inconel 713C is an alloy whose main element of its composition is nickel. The combination of high levels of this element and the structure of this material makes it very difficult to be transformed by the machining process. Because of this difficulty and lack of information about the machining of this material, the purpose of this study was t
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/02/2012
-
12. Entrevista de Oliver Stuenkel para a Rádio CBN: greve de fome para combater a corrupção tem causado desconfiança na Índia
Publicado em: 27/08/2011