Resistência mecânica da madeira de eucalyptus saligna unidas por adesivo poliuretano para diferentes acabamentos de superfície
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Data
2013-11-05
Autores
Silva, Reinaldo Sebastião [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
O presente trabalho teve como objetivo, verificar o desempenho de juntas coladas em função do acabamento das superfícies usinadas em operações de fresamento para diferentes velocidades de avanço e de lixamento para diferentes granulometrias de lixa, empregando-se madeira da espécie Eucalyptus saligna. Para tanto, foram confeccionadas amostras para ensaios normatizados pela Norma ABNT - NBR 7190, submetidas a testes de resistência a ruptura na linha de cola por esforços de cisalhamento e por tração normal. Na união das peças de madeira para confecção das amostras utilizou-se dois tipos de adesivos à base de resina poliuretano (PU), denominados neste estudo por “PU monocomponente” e “PU bicomponente”. Na preparação das superfícies para aplicação dos adesivos, o primeiro grupo de amostras foi usinado por operação de fresamento cilíndrico tangencial empregando-se três velocidades nominais de avanço “Vf” de 6,0; 11,0 e 15,0 m/min, o segundo grupo de amostras foi usinado por operação de lixamento empregando-se cinco granulometrias de lixas, granas: 80, 100, 120, 150 e 220. Dos resultados obtidos podem-se destacar os melhores desempenhos de resistência a ruptura; para superfícies fresadas: ao cisalhamento com Vf = 6,0 m/min com adesivo PU monocomponente e Vf = 15,0 m/min com adesivo PU bicomponente, à tração normal com Vf = 11,0 m/min para ambos adesivos PU; para superfícies lixadas: ao cisalhamento com lixa de grana 100 e à tração normal com lixa de grana 80, para ambos os adesivos PU
The present work had as the main goal, to verify the performance of glued joints for finishing touch of machined surfaces in operations of milling for different speeds of advance and of fine sanding for different granulometry of sandpaper, using wood of the Eucalyptus saligna type. For that; samples have been manufactured for the experiments regulated by the ABNT rule – NBR 7190, subjected to tests of resistance to the rupture of the glue line for efforts of degloving and for the normal traction. In the union of the wooden parts to make the samples 2 types of polyurethane based adhesives (PU) were used, named in this study Mono component PU and Bi component PU. In the preparation of the surfaces for the application of the adhesives, the first group of the samples was machined by the operation of cylindrical tangential milling employing three nominal advance speed “Vf” of 6,0; 11,0 and 15,0 m/min, the second group of samples was machined by the operation of sanding employing five types of sandpaper granulometry, grains: 80, 100, 120, 150 and 220. From the obtained results it is possible to point out the best performances from resistance to rupture; for the milled surfaces: to the degloving with Vf = 6,0 m/min with the PU Mono component and Vf = 15,0 m/min with the PU Bi component, to the normal traction Vf = 11,0 m/min for both PU adhesives; for the sanded surfaces: to the degloving with a 100 grain sandpaper and to the normal traction with the 80, for both PU adhesives
The present work had as the main goal, to verify the performance of glued joints for finishing touch of machined surfaces in operations of milling for different speeds of advance and of fine sanding for different granulometry of sandpaper, using wood of the Eucalyptus saligna type. For that; samples have been manufactured for the experiments regulated by the ABNT rule – NBR 7190, subjected to tests of resistance to the rupture of the glue line for efforts of degloving and for the normal traction. In the union of the wooden parts to make the samples 2 types of polyurethane based adhesives (PU) were used, named in this study Mono component PU and Bi component PU. In the preparation of the surfaces for the application of the adhesives, the first group of the samples was machined by the operation of cylindrical tangential milling employing three nominal advance speed “Vf” of 6,0; 11,0 and 15,0 m/min, the second group of samples was machined by the operation of sanding employing five types of sandpaper granulometry, grains: 80, 100, 120, 150 and 220. From the obtained results it is possible to point out the best performances from resistance to rupture; for the milled surfaces: to the degloving with Vf = 6,0 m/min with the PU Mono component and Vf = 15,0 m/min with the PU Bi component, to the normal traction Vf = 11,0 m/min for both PU adhesives; for the sanded surfaces: to the degloving with a 100 grain sandpaper and to the normal traction with the 80, for both PU adhesives
Descrição
Palavras-chave
Trabalhos em madeira, Eucalipto, Usinagem, Materiais granulados, Adesivos, Lixadeiras, Resistência à tração, Resistência ao cisalhamento, Lignocelulose, Woodwork
Como citar
SILVA, Reinaldo Sebastião. Resistência mecânica da madeira de eucalyptus saligna unidas por adesivo poliuretano para diferentes acabamentos de superfície. 2013. 102 f. Tese (doutorado) – Universidade Estadual Paulista, Faculdade de Engenharia de Guaratinguetá, 2013.