| 摘要 |
Disclosed in the present invention is an indexable expanding drill comprises a cutter body (2) and a guide head (1) arranged on the cutter body. The cutter body is provided with a double spiral chip-removing groove (201). The guide head is provided with two symmetrical outer blades (101) using indexable blades installed symmetrically outside the guide head. The expanding drill reduces generating eccentric distance, improves the rigidity of the cutter, and reduces vibration during cutting, thus improving cutting efficiency, ensuring automatic chip-removing- holding capacity and reducing cutter friction during cutting. |
