Method for chamfering toothed gear

A method for chamfering toothed gears comprising:

• a toothed gear formation step of forming a plurality of teeth around the axis of a toothed gear;
• and a chamfering step of sequentially chamfering the teeth formed by the toothed gear formation step with a tool, the tool including a plurality of end cutting edges formed at an end portion in the axis direction of the tool and formed around the axis of the tool, in which method for chamfering toothed gears, at the chamfering step, the axis of the tool is inclined from the axis of the toothed gear and the toothed gear and the tool are rotated and the line intersection portions between tooth flanks positioned on the forward side in the direction of rotation of the toothed gear among the tooth flanks of the teeth and end faces of the teeth in the tooth trace direction are thereby sequentially chamfered with the end cutting edges,
• wherein a pitch of the end cutting edges is set to M times a pitch of the teeth, and wherein at the chamfering step, a circumferential speed of the end cutting edges is made faster than a circumferential speed of the teeth to chamfer the line intersection portions;
• the teeth are chamfered every N teeth;
• and values of M and N satisfy a relation of M>1, a relation of M−1>N≥1, and that N is an integer.