Micro Machining
Mostrando 13-23 de 23 artigos, teses e dissertações.
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13. In-situ raman spectroscopy analysis of re-crystallization annealing of diamond turned silicon crystal
Mechanical material removal during ultraprecision machining of semiconductors crystals normally induces surface damage. In this article, Raman micro-spectroscopy has been used to probe structural alteration as well as residual stresses in the machined surface generated by single point diamond turning. The damage found is characterized by an amorphous phase i
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2007-03
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14. Photoelastic analysis of stress transmitted from implant-supported frameworks achieved by cilinders lutingand laser welding techniques before and after eletric discharge machining / Analise fotoelastica das tensões induzidas por infra-estruturas implanto-suportadas obtidas pelas tecnicas de cimentação dos cilindros e soldagem a laser, antes e apos eletroerosão
The purpose of the study was to evaluate the passive fit of fixed implantsupported prothesis titanium frameworks, through photoelastic stress analysis. Two frameworks welded in commercially pure titanium (Tritan® -Dentaurum -Germany) were fabricated by two methods based on a metal model composed of five analogous Micro-Unit (Conexão -São Paulo): Framework
Publicado em: 2007
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15. Analise do desgaste de ferramentas no fresamento com alta velocidade de aços endurecidos / Analysis of tool wear in high speed milling of hardened steels
Usually, the die and moulds components, which are responsible for the part forms, have complex geometries and are made of high hardness materials, what cause difficulties for their machining. High Speed Milling has become an alternative for machining these components. This work aims to broaden the performance understanding and the wear mechanisms on tools us
Publicado em: 2007
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16. Otimização do processo de usinagem de titânio com laser pulsado de neodímio / I. A. ALMEIDA. Optimization of Titanium Machining by Pulsed Nd:Yag Laser. 2007. Thesis (Doctoral) - Tecnologia Nuclear Materiais - IPEN, Universidade de São Paulo, São Paulo, 2007.
The main goal of this work was to establish the requirements for laser processed parts to satisfy uniform surface finish, low roughness and preservation of the mechanical and functional properties of the parts. Lasers became a versatile machining tool that satisfies the modern trends in material processing. In this study, the cutting quality factors of sheet
Publicado em: 2007
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17. Parametric optimization of wire electrical discharge machining (WEDM) process using taguchi method
Wire electrical discharge machining (WEDM) is a specialized thermal machining process capable of accurately machining parts of hard materials with complex shapes. Parts having sharp edges that pose difficulties to be machined by the main stream machining processes can be easily machined by WEDM process. Technology of the WEDM process is based on the conventi
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2006-12
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18. Estudio de la resistencia a la tracción y deformación de fundición esferoidal de pequeño espesor
The present work analyzes the mechanical properties of plates with thickness ranged between 1.5 to 4mm. Heats with different carbon equivalent (CE) were produced and resin bonded sand molds with vertical and horizontal gating systems were pour. Nodules counting ranged between 900 to 2200 nod/mm2 were obtained. All plates were ferritized prior to machining te
Matéria (Rio de Janeiro). Publicado em: 2006-09
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19. Contribution to study effects of the turning operations in the surface integrity in a super duplex stainless steel. / Contribuição ao estudo da integridade superficial de um aço inoxidável super-duplex após usinagem.
The objective of this work was to study the effects of the turning operations in the surface integrity in a super duplex stainless steel (SDSS) ASTM A890-Gr6A. The focus of the work was the finishing operations but some tests in rough operations were carried out. A complete factorial planning was used for both, with 2 levels and 5 factors. The tests were con
Publicado em: 2006
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20. Avaliação da replicagem de moldes torneados com ferramenta de diamante usando prensagem a quente em polimetilmetacrilato (PMMA) / Evaluation of the replication of molds generated from single point diamond turning using hot embossing in polymethylmethacrylate (PMMA)
In this work, different types of microstructures were generated by single point diamond turning and microindentation for will replicated through the hot embossing. Tests were carried to evaluate the generation these microstructures by two distinct methods: micro-deformation and micro-machining, planned to observe the replication of the mark generated by the
Publicado em: 2006
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21. Caracterização da integridade de superfícies usinadas para produção de moldes e matrizes
Este trabalho abrange o estudo do processo convencional de fabricação de moldes e matrizes, ou seja, passando por processos de fresamento, eletroerosão e lixamento. Estes três processos foram aplicados ao material AISI H13, usualmente empregado na fabricação de moldes e matrizes. Além disso, foram variadas condições de usinagem, como o uso de fluíd
Publicado em: 2006
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22. Characterization of structural alteration in diamond turned silicon crystal by means of micro raman spectroscopy and transmission electron microscopy
In this work, (100) oriented monocrystalline silicon samples were single point diamond turned under conditions that led to a ductile and brittle regime. Raman spectroscopy results showed that the ductile regime diamond turning of silicon surfaces induced amorphization and, on the contrary, in the brittle mode machining condition this amorphous layer does not
Materials Research. Publicado em: 2005-09
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23. Obtenção de revestimentos dúplex por nitretação a plasma e PVD-TiN em aços ferramenta AISI D2 e AISI H13. / Duplex coatings on AISI H13 and AISI D2 tool steels by using plasma nitriding and TiN-PVD.
In this work, the influence of both the microstructure and the load-bearing capacity of nitrided layers, formed on top of AISI D2 and AISI H13 tool steels, on adhesion and wear resistance of PVD-TiN coatings was studied. The threshold nitriding potential curves for the above mentioned steels and the optimum conditions of the pre-treatments which increased th
Publicado em: 2003