Study on the Cutting Mechanism of Abrasive Grain (4th Report)

Relations between the Interference Angle and Sliding Phenomenon of the Cutting Edge

Abstract

Sliding phenomena of cutting edges on the surface of workpiece are important peculiarities which must be taken into consideration on making clear chip formation in grinding. Abrasive grains may not produce chips in forms settled geometrically and may slide on the surface of workpiece from the beginning of contact to a certain point without chip formation.
In this report, such various phenomena at the beginning of cut as elastic and plastic lengths of contact between the cutting edge and workpiece have been investigated by having carried out cutting experiments, where the cutting velocity have been changed in transitional region of voelocity between turning and grinding and the interference angle in the very small range, in case that the depth of cut have increased linearly with the cutting distance.
The results are as follows.
In the cutting where the depth of cut increases linearly from zero, there are the region of elastic deformation and that of the plastic before the cutting region and critical points limiting these three regions are settled by the value of the depth of cut. The elastic and plastic lengths of sliding increase, therefore, with the decrease of the interference angle. Then the effect of the cutting velocity on cutting process is considerably large and elastic and plastic sliding lengths of cutting edge decrease with the increase of the cutting velocity.