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Abstract(s)
Esta dissertação é o culminar de um estágio curricular realizado na empresa Mepisurfaces
Lda. Esta empresa dedica-se ao polimento de componentes para artigos de luxo e
recentemente à maquinação dos mesmos, componentes estes constituídos por ligas de latão
com chumbo residual na sua composição. De todos os elementos presentes, o chumbo tem
especial importância no processo de maquinagem, uma vez que opera como lubrificante
possibilitando diminuir os esforços de corte. Devido a pressões internacionais, existe a
necessidade de reduzir cada vez mais a presença do chumbo nas ligas de latão dos
componentes, com um teor residual de até 0,25% da massa. Esta redução exerce pressão
sobre o setor de maquinagem, sendo esperada uma diminuição da maquinabilidade do
material.
No que à maquinagem diz respeito, as diferenças embutidas pelo ???? nas ligas ???? - ???? são
consideráveis, pelo que se procurou então a maquinabilidade da liga de latão empregue na
empresa. Nesse sentido, foram realizados diversos ensaios com vista à caraterização do
material.
As ferramentas de corte são um dos elementos com maior impacto económico no processo
produtivo, pelo que é essencial o seu estudo para compreender a sua influência no processo.
O presente trabalho procura apresentar vantagens e/ou desvantagens de soluções de
engenharia. Uma das propostas foi a influência do número de insertos de uma fresa no
acabamento superficial dos componentes maquinados.
This thesis is the result of an internship at Mepisurfaces Lda which is a company dedicated to the polishing of components for high-end companies and most recently towards the machining of the same components. These components are made from brass alloys with a residual composition of lead. From all the components that compose the alloys, lead has a key role in the machining process since it helps reducing cutting efforts with its lubricant ability. Due to international pressure, the presence of lead must be lowered down in brass alloys to a residual content up to 0,25% of the mass of the component. This reduction presents pressure in the machining sector, with an expected reduction of the material machinability. Regarding machining, the difference that lead makes in Cu-Zn alloys are substantial, because of that it’s needed to know better the machinability of the brass alloys used at the company. Cutting tools are one of the main elements of the whole machining process, having an significant economic impact in the productive process, wherefore it’s needed to understand better its influence in the process. The present work seeks to present advantages and/or disadvantages of engineering solutions. One of the proposals was the influence of the number of inserts of a milling cutter on the surface finish of machined components.
This thesis is the result of an internship at Mepisurfaces Lda which is a company dedicated to the polishing of components for high-end companies and most recently towards the machining of the same components. These components are made from brass alloys with a residual composition of lead. From all the components that compose the alloys, lead has a key role in the machining process since it helps reducing cutting efforts with its lubricant ability. Due to international pressure, the presence of lead must be lowered down in brass alloys to a residual content up to 0,25% of the mass of the component. This reduction presents pressure in the machining sector, with an expected reduction of the material machinability. Regarding machining, the difference that lead makes in Cu-Zn alloys are substantial, because of that it’s needed to know better the machinability of the brass alloys used at the company. Cutting tools are one of the main elements of the whole machining process, having an significant economic impact in the productive process, wherefore it’s needed to understand better its influence in the process. The present work seeks to present advantages and/or disadvantages of engineering solutions. One of the proposals was the influence of the number of inserts of a milling cutter on the surface finish of machined components.
Description
Keywords
Ferramentas de Corte Ligas Cu - Zn Maquinabilidade