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Machining of plastics: A new approach for modeling
Author(s) -
Quadrini F.
Publication year - 2008
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.20968
Subject(s) - thrust , torque , materials science , drilling , machining , viscoelasticity , logarithm , mechanical engineering , polyamide , composite material , mechanics , engineering , thermodynamics , metallurgy , mathematics , physics , mathematical analysis
A theoretical model was defined to predict cutting forces in drilling of polyamide. This model was not built in analogy to metal cutting but starting from the viscoelastic behavior of the workpiece material. The drilling thrust and torque were assumed to be a logarithmic function of the ratio between a characteristic time of the material and a process time. Drilling tests were carried out to experimentally evaluate the thrust and torque in dependence of drilling speed and feed rate. The experimental data are in good agreement with the predicted logarithmic trend, except at high feed rates at which a plateau is observed. The chip formation mechanism was recognized to affect the thrust and torque dependence on feed rate so that the theoretical model was opportunely corrected. POLYM. ENG. SCI., 2008. © 2007 Society of Plastics Engineers