Abstract
The mechanism of chip formation on turning with a self-propelled rotary cutting tool is complicated as compared with a conventional type. In this paper, the rotation of tool, the contractibility of chip, the flow angle of chip, the sectional form of chip and the normal shear angle are experimentally investigated. Furthermore, the mechanism of chip formation is analyzed in comparison with that of the same tool with the fixed edge.
The results obtained are as follows.
1) The normal shear angle of the rotary cutting tool is less than that of the tool with the fixed edge and the contractibility of chip is larger. These results are considered that the section area of chip is smaller and the chip is lengthened to the flow direction of chip, for the decrease of chip pile up rate in a plane perpendicular to the cutting edge, that is, the increase of chip flow angle is larger as compared with the increase of chip thickness.
2) The tool rotation varies by the friction of tool mount, the affinity of tool and chip interface and the property of workpiece and so forth, but these influences are less. The tool rotation is mainly determined by cutting speed and inclination angle of tool.
