Cutter rigidity increasing device

The embodiment of the invention discloses a cutter rigidity increasing device which comprises a ring clamp, a clamping device, a clamping device, a clamping device and a driving device. The diameter of the ring clamp is matched with that of a cutter bar of a to-be-clamped cutter. The connecting column and the ring clamp are integrally formed or fixedly connected; the telescopic rod is movably connected with the inner cavity of the connecting column, an elastic piece is arranged on the outer side of the telescopic rod in a sleeving mode, and the telescopic rod can stretch out and draw back in the inner cavity and can rotate in the circumferential direction; the movable connecting part is connected to the end of the telescopic rod and used for sliding after making contact with the inner wall of a shell to be machined. The rigidity of the cutter is improved, and vibration of the cutter is reduced. 本发明实施例公开了一种刀具刚性增加装置，包括：环卡箍，所述环卡箍的直径与待夹持刀具的刀杆适配；连接柱，所述连接柱与所述环卡箍一体成型或固定连接；伸缩杆，所述伸缩杆与所述连接柱的内腔活动连接，外侧套设有弹性件，可在所述内腔中伸缩且可周