Method for chamfering toothed gear
AssigneeOsg Corporation
InventorKoji Tsutsuyama
Life of this patent
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Abstract
A method for chamfering toothed gears which enables lengthening of a life of a tool is provided. The chamfering method is for sequentially chamfering the line intersection portions 23 between tooth flanks 21 and end faces 22 of teeth 2 with end cutting edges 122. A pitch Pb of the end cutting edges 122 is set to five times a pitch Pa of the teeth 2. As a result, at a chamfering step of chamfering line intersection portions 23 of the teeth 2, a circumferential speed of the end cutting edges 122 can be made faster than a circumferential speed of the teeth 2. Consequently, a difference in circumferential speed between the end cutting edges 122 and the teeth 2 can be utilized in chamfering and thus a cutting resistance can be reduced during the chamfering. Therefore, a life of the tool 100 can be lengthened.
Claims14
A method for chamfering a toothed gear, the method comprising:
- a toothed gear formation step of forming a plurality of teeth around an axis of the toothed gear;
- and
- a chamfering step of sequentially chamfering, with a tool, the teeth formed by the toothed gear formation step, the tool including a plurality of end cutting edges formed at an end portion in an axis direction of an axis of the tool and formed around the axis of the tool,
- in which method for chamfering the toothed gear, 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 line intersection portions, between:
- (i) tooth flanks positioned on a forward side in a direction of rotation of the toothed gear among tooth flanks of the teeth, and (ii) end faces of the teeth in a tooth trace direction that extends in the direction of the axis of the toothed gear, 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, and a relation of M−1>N≥1.
Dependencies are inferred from the claim text.