Análise numérica-experimental da força de corte na usinagem de uma liga de alumínio 7075-T6
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Data
2019-09-20
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Universidade Federal de Goiás
Resumo
Chip formation is linked to various machining parameters that directly affect the cutting
forces, shear stresses, power and temperatures associated with the machining process.
Chip formation mechanisms have been studied for over 100 years and because they
involve high temperatures and high deformation rates, there is some difficulty in accurately
predicting a mathematical model to describe the formation of this phenomenon,
considering the various types of materials available. Efforts during the cutting process are
important elements for tool manufacturers and industry consumers. By predicting the
stress values during a machining process, you can optimize the manufacture of the
consumable, avoiding unexpected stops for tool change, for example. This paper presents
the results of experiments in the process of orthogonal bedame turning in a 7075-T6
aluminum alloy with variations in cutting speed and cutting feed rates. The tests were
performed using carbide tool MGMN 300-M-H01 - CLASS N and the shear force (Fc)
values were collected with a load cell data acquisition system and a data acquisition plate.
. Numerical simulations were also performed by the finite element method using Ansys ®
software in its explicit dynamic module, simulating the value of the shear force (Fc) during
the machining process. Twenty simulations were performed with a fixed hexahedral mesh
containing 24021 nodes and 20600 elements. In the numerical simulation by the finiteelement method an increase in the cutting force (Fc) was observed when the cutting speed
was reduced, and an increase in the cutting force when there was an increase in the depth
of cut and the cutting feed respectively. In the experimental tests obtained the same
results trends found in the simulation. These results are important to contribute to the
knowledge of the numerical simulation turning process, allowing cost reductions and
better performance in the manufacturing process. This enables the definition of a method
that will predict the cutting force employed in the process, contributing satisfactorily to the
quality, wear and precision of the manufacturing process.
Descrição
Palavras-chave
Torneamento, Elementos finitos, Força de corte, Alumínio 7075-T6, Lathe, Finite elements, Cutting force, Aluminum 7075-T6
Citação
RAMALDES, L. L. Análise numérica-experimental da força de corte na usinagem de uma liga de alumínio 7075-T6. 2019. 98 f. Dissertação (Mestrado em Engenharia de Produção) - Universidade Federal de Goiás, Catalão,
2019.