Researches on Turning with Self-propelled Rotary Cutting Tool

Velocity Relief Angle and Flank Wear

Abstract

This paper deals with the rotary cutting tool wear and the velocity relief angle which is defined in this paper as the modified relief angle given by the inclination of tool face. The cutting operation with the rotary cutting tool is almost impossible when the velocity relief angle is zero. This is called the limit of the cutting. This paper also discussed the available limit of tool shape and the cutting conditions, and examined the domain of practical use.
Flank wear of the tool was discussed from the point of geometrical view, and the pattern of the tool wear was confirmed experimentally by the SUMP method (resin replica method) and the tool-maker's microscope.
The results obtained are as follows.
1) Larger tool diameter, work diameter and relief angle, and smaller tool inclination angle, depth of cut and feed tend to make the zone wider in which the cutting operation can be perf ormed.
2) Flank wear of the rotary tool advances with a curvature at the cutting edge.
3) Flank wear of the rotary tool is extremely less than that of the conventional tool, and is hardly affected by the inclination angle of the rotary tool.