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Influence of the cutting wedge on the formation of material reaction to the cutting tool |
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Influence of the cutting wedge on the formation of material reaction to the cutting tool Authors: J. Jonak, J. Podgórski
The article presents results of studies on the influence of the cutting wedge geometry on the parameters of the work material and the value of the coefficient of friction between the cutting wedge and work material on the formation of material reaction to the cutting wedge. The studies were carried out by means of FEA analysis with the application of the ALGOR system that was extended to cover the problems of the contact zone. As a result of the analyses carried out, it was found out that the radius of the cutting edge rounding, coefficient of friction of the cutting wedge against the work material, value of the rake angle and size of the cutting wedge wear band have a decisive influence on the level of material reaction to the cutting wedge. The value of Fp/Fc ratio, i.e. the ratio between the force of material reaction to the cutting wedge (Fp) to the force exciting wedge movement (Fc) in the case of sharp cutting wedges (rn = 0.01 mm, a[alfa]o = b[beta]o = 5°) ranged at the level of 0.3. Direction of reaction was such that the wedge was "pulled out" of the holder. An increase in the radius of the cutting edge rounding (rn) to 1.5 mm caused a rapid decrease in the analysed ratio up to about 0.03 (or lower, depending on the coefficient of friction). Similarly, a decrease in the rake angle of the cutting wedge (y[gamma]o = -7.5) caused a decrease in the studied ratio up to the level of 0.1. Also the direction of the Fp reaction changed. The wedge was pushed out from the work zone. The tendencies observed by the present authors agree with the other results (Ingraffea et al., eds.).
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2009