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Friction in linear orthogonal cutting of beech wood (Fagus sylvatica) considering ploughing effect forces due to cutting tool tip bluntness
Merhar, Miran ; Bučar, Bojan, 1961-2012
The paper presents the calculation of the coefficient of friction between the cutting tool and the chip in case of linear orthogonal cutting in the direction of 90-0°. Beech wood was cut with HSS ...cutting-tool at the cutting speed of 0.03 m.s-1. Rake angles were 16, 22, 31 and 42°, and the depths of cut were 0.3, 0.25, 0.2, 0.15 and 0.1 mm. A type II chip according to Franz was formed at the angles of 16 and 22°, and a type I chip was formed at the angles of 31 and 42°. The force resulting from the ploughing effect due to cutting tool tip bluntness was subtracted from the forces measured perpendicularly to the direction of cutting Fy, while the force resulting from the ploughing effect and the fracture force for creation of new surfaces were subtracted from the forces measured in the direction of cutting Fx. The coefficient of friction at all rake angles and depths of cut, calculated from the difference of forces, was 0.46 on average with a standard deviation of 0.009. The model with subtracted forces resulting from the ploughing effect has proved to be correct; the calculated coefficient of friction at all rake angles and chip thicknesses is constant since the coefficient of friction has to be independent of the force magnitude, while in the literature found, the coefficient of friction varies with the chip thickness and rake angle.
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