Billets
Mostrando 1-12 de 29 artigos, teses e dissertações.
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1. SYNTHESIS OF TOLUENE DIISOCYANATE URETHANE PREPOLYMER USING CASTOR OIL AND EVALUATION OF MECHANICAL PROPERTIES
This research is the synthesis of urethane prepolymer cast elastomer which had been produced using toluene diisocyanate and castor oil to replace the synthetic polyol, from petroleum origin, and the evaluation of mechanical properties of the polyurethane. The focus was to replace polyol from petroleum to vegetable material looking for renewable resources. Th
Química Nova. Publicado em: 2022
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2. Failure mode and effect analysis (FMEA) in mechanized harvest of sugarcane billets
ABSTRACT The quality control is used for the evaluation of processes and products, and it is important to detect and reduce variability and in operations management can be applied in mechanized harvesting of sugarcane billets. In this sense, this study aimed to identify critical quality indicators and, if necessary, to develop a continuous improvement plan f
Eng. Agríc.. Publicado em: 2018-01
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3. Microstructural Characterization and Evaluation of the Thermomechanical Behavior of an Al 7075-T651 Alloy Deformed by Two Passes of ECAP
Billets of an Al 7075-T651 alloy were processed by two passes of equal channel angular pressing, ECAP, by following route A. First pass was performed at 180°C and the second one in the temperatures 130 and 180°C. The resulting microstructures were characterized by optical microscopy, OM, and scanning electron microscopy, SEM. Also, material macroscopic mec
Mat. Res.. Publicado em: 17/11/2017
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4. QUALITY OF SUGARCANE MECHANIZED PLANTING
ABSTRACT: The quality of the sugarcane plantation affects the plantation longevity, yield and production costs. Therefore, this study aimed to evaluate the quality of sugarcane mechanized planting in day and night shifts. The mechanized planting was carried out in Ivinhema, MS, Brazil. For the evaluation of pre-planting seedlings, were collected 40 billets i
Eng. Agríc.. Publicado em: 2016-12
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5. The Formation Mechanism of Porosity for Spray-deposited 7075 Alloy
The distribution model of temperature for the billets was established based on the porosity formation mechanism. By calculating the numerical relationship between the temperature of the deposition layer and the formation ability of the porosity, the distribution of porosity for spray formed 7075 aluminum billets was predicted and the influence of superheat o
Mat. Res.. Publicado em: 04/12/2015
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6. Extrusion-shear of AZ31 alloy billets with low temperature and high speed by using three-dimensional finite element modeling and experiments
A new kind of compound extrusion technology including direct extrusion and shears for AZ31 magnesium billets can cause plastic large deformations and high strain rates. A series of compressive tests have been done to obtain the stress-strain curves of AZ31 magnesium alloy. Three-dimensional (3D) thermo-mechanical coupled finite element modeling of forming ma
Mat. Res.. Publicado em: 28/07/2014
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7. 3D finite element modeling of grains refinement for magnesium alloys by extrusion-shear and experimental verification
To explore the deformation mechanisms of a new composite extrusion including extrusion and successive shear subsequently which is shorten "ES", Three dimensional finite element modeling of grain refinements for magnesium alloys by ES process has been researched. The ES die have been designed and manufactured and installed to the horizontal extruder. Finite e
Mat. Res.. Publicado em: 28/07/2014
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8. Simulação computacional, projeto, construção e análise do desempenho de uma matriz para extrusão em canal angular dedicada ao processamento de chapas / Computational simulation, design, construction and performance analysis of an equal channel angular pressing die for the processing of flat billets
The present work describes the design, construction and testing of an equal channel angular pressing (ECAP) die characterized by rectangular cross section channels. The main parameter of the ECAP dies is the geometry of the channels, given by the angle trough which they meet, and the curvature radii at this point. The material employed in the experiments was
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/08/2012
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9. Microstructural control of Co-based PTA coatings
Cobalt-based alloys are widely used as hardfacing materials when wear resistance is required at room temperature or high temperature applications. However, their performance is a consequence of their microstructures that depends on the processing conditions. This work focused on the influence of solidification rate on the structure development by processing
Mat. Res.. Publicado em: 16/08/2012
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10. Estudo de aço microligado ao vanádio para a produção de barra nervurada para concreto armado com característica de soldabilidade segundo norma ABNT NBR 8965:1985
This paper presents a vanadium microalloyed steel for the production of reinforced bars (rebars) that meets the chemical composition limits established by Brazilian standards to be considered weldable. Steel is produced via electric furnace, giving rise to billets. It is hot rolled in a rolling mill and cooled in air to obtain the rebar that meets the mechan
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2012
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11. Numerical model of electromagnetic stirring for continuos casting billets
Thispaperintroducesanumericalmodelofanelectromagnetic rotary stirrer based on the finite-element model.Such stirrers are used to improve the quality of continuously cast steel, particularly billets and blooms. The method determines the magnetic flux density profile and compares it to experimental measurements. In addition, it calculates the Lorentz force fie
Publicado em: 2011
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12. Desenvolvimento de software de simulação da solidificação de aços no processo de lingotamento contínuo de tarugos / Development of simulation software for the continuous casting process of steel billets
The development and application of simulation software for the continuous casting process is proposed in this work. The heat transfer and solidification models were validated with experimental results of temperature measurements in an industrial plant as well as with steel billets samples. Thermocouples embedded in the mold walls were used to measure tempera
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2011