| 摘要 |
A rotary tool holder (20) includes a shank (58) having a flange (66), a tapered outer surface (64), and front and rear contact portions (60). The tapered outer surface (64) corresponds to the tapered bore of a spindle, and flexible circular cantilevers (70, 103) are provided at one or both contact portions such that a free end (76, 105) of the cantilevers expands radially due to centrifugal force to maintain contact with the tapered bore (53). The shank (58) can be formed from an inner member (113) and a sleeve (115) disposed thereover, in which portions of the sleeve (115) form the circular cantilevers. The circular cantilevers (256) can also be formed by a cavity (260) created in the shank (253). Alternatively, instead of circular cantilevers (256), the shank of the tool holder can have a taper which is optimized for a certain speed, wherein the taper of the shank (403) has a first taper at rest and a different taper (phi22) at a desired speed. |
