Referência Completa


Título: Analytical model for force prediction in 5-axis milling
Autor : Daniela Vacarini de Faria
Curso : Engenharia Mecânica-Aeronáutica
Orientador : Jefferson de Oliveira Gomes
Ano de Publicação : 2012
Assuntos : Fresagem (usinagem)
t Cargas (forças)
t Predição
t Usinagem
t Engenharia mecânica
Resumo : In this work, a analytical model for forces prediction in 5 axis milling was developed. For that, a analytical geometric model for the chip geometry was developed and a analytical model for force prediction was studied. In the geometry model, the tool movement in tree displacement axes and two rotation axis was considered. The cutting tool was be divided in slices which are perpendicular to the axial vector of the tool and radius was then associated with each slice creating a vector that describes the whole tool geometry. The chip thickness for each one of the slices were calculated by an analytical method based on Matellotti equation, but adapted for the complex motion of a 5-axis mill. This method permits the calculation of the whole chip geometry for any milling tool, since it doesn';t require a surface formula for each tool. The cutting edge trajectory were considered circular. For the force modelling, the Altintas model was used, which considers both the cutting forces and cutting edge effects. The force coefficients were predicted performing a set of orthogonal cuts. The data was then processed in order to calculate the cutting coefficients according to Merchant';s plane shear surface theory.
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