| 摘要 |
Provided is a barrel worm-shaped tool, which is enabled to perform a gear working highly precisely by reducing a working load and an offset wear. The barrel worm-shaped tool is a barrel worm-shaped grindstone (12), which is formed to have its diameter enlarged gradually as it comes from its two axial end portions to its axial middle portion, so that it is used for the gear machining of an internal gear (11). In accordance with the machining allowance of the internal gear (11), the tooth form (31) of the grindstone (12) is formed to become gradually smaller as it goes from the axial middle portion to the two axial end portions. |
