On the Generating Mechanism of Surface Roughness : Forming Process of Single Asperity

概要

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It is clear that the pile-up phenomena on both sides of the grooves produced by means of abrasive grains have some effects on the roughness of finished surface. In this paper for the purpose of making the effect of the pile-up on the surface roughness clear the ratio of an actual generated asperity height to a geometrical asperity one, η_S for a conical cutting edge and η_<Sγ> for a conical cutting edge with a spherical top could be estimated theoretically using the theory of plasticity. The theoretical values of η_S and η_<Sγ> showed a good agreement with experimental ones. It is evident from the experimental results that the values of η_S are independent of the depth of cut and increase with the apical angle of conical cutting edge. It is also clear that the values of η_<Sγ> decrease with an increasing apical angle of edge, depth of cut and coefficient of friction. And η_<Sγ> decreases with a decreasing radius of top of conical edge but is scarcely influenced by the cutting speed and the cutting fluid.
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