A Study on Cutting Forces in Gear Cutting : Specific Cutting Forces by Cutting Tools with Circular and Straight Edges

Abstract

As the cutting condition of generating gears such as in hobbing is very complex, the specific cutting forces are different from those of orthogonal turning. In general, the specific cutting forces in hobbing are large, since the flowing chips interfere on the tool face. When two or three edges of a cutting tool cut simultaneo usly, the chips flow in different directions, and interfere with each other. In this paper, the specific cutting forces caused by the interference of flowing chips are investigated by cutting tests with round nose straight tools with various nose radii. As a result, the influence of the interference of flowing chips on the specific cutting forces becomes large with large undeformed chip thickness.