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Abstract(s)
O processo de estampagem desempenha um papel fundamental em vários setores,
nomeadamente o setor automóvel. Pela sua grande utilização, este ramo impulsionou a evolução
de tecnologias e materiais usados em conformação plástica. Ainda que os aços de elevado limite
elástico desenvolvidos apresentem excelentes propriedades mecânicas, existem inconvenientes
relacionados com a sua conformabilidade, que estão associados ao aparecimento de defeitos que
comprometem a qualidade dos produtos. Estes materiais podem apresentar respostas
imprevisíveis devido a variações na sua composição química, tratamento térmico, processamento
e outros parâmetros derivados do seu processo de fabrico, pelo que são necessários testes para
garantir que o seu desempenho é satisfatório. Com o intuito de prever o aparecimento destes
defeitos, a indústria tem vindo a recorrer às ferramentas de simulação numérica para estudar o
comportamento dos materiais quando sujeitos a processos de conformação. Os softwares de
simulação são, por isso, um instrumento bastante útil quando o conhecimento sobre determinado
material ou processo é limitado. Deste modo, o foco deste trabalho consistiu no estudo do
comportamento dos aços de elevado limite elástico e nas potencialidades da modelação numérica
e as vantagens da sua aplicação à simulação de processos de fabrico na otimização do processo e
na eliminação ou prevenção da formação de defeitos.
The stamping process plays a key role in several industries, namely the automotive industry. Due to its widespread application, this sector has driven the evolution of technologies and materials used in plastic forming. Although the high strength steels have shown excellent mechanical properties, there are drawbacks related to their formability, which are associated with the appearance of defects that compromise product quality. These materials can show unpredictable responses due to variations in their chemical composition, heat treatment, processing and other parameters derived from their manufacturing process, thus tests are needed to ensure that their performance is satisfactory. With the intention of predicting the appearance of this defects, the industry has been resorting to numerical simulation tools to study the behavior of materials when subjected to forming processes. Simulation software is, therefore, a very useful instrument when knowledge about a certain material or process is limited. Therefore, the focus of this work was to study the behaviour of high yield strength steels and the potential of numerical modelling and the advantages of applying it to the simulation of manufacturing processes in order to optimize the process and eliminating or preventing the formation of defects.
The stamping process plays a key role in several industries, namely the automotive industry. Due to its widespread application, this sector has driven the evolution of technologies and materials used in plastic forming. Although the high strength steels have shown excellent mechanical properties, there are drawbacks related to their formability, which are associated with the appearance of defects that compromise product quality. These materials can show unpredictable responses due to variations in their chemical composition, heat treatment, processing and other parameters derived from their manufacturing process, thus tests are needed to ensure that their performance is satisfactory. With the intention of predicting the appearance of this defects, the industry has been resorting to numerical simulation tools to study the behavior of materials when subjected to forming processes. Simulation software is, therefore, a very useful instrument when knowledge about a certain material or process is limited. Therefore, the focus of this work was to study the behaviour of high yield strength steels and the potential of numerical modelling and the advantages of applying it to the simulation of manufacturing processes in order to optimize the process and eliminating or preventing the formation of defects.
Description
Keywords
Automotive industry Stamping Plastic deformation High yield strength steels Finite elements Stampack