| 摘要 |
A cutting tool for machining a work piece to form a turbine rotor having a longitudinal axis includes a plurality of curved splines extending from a back of the tool to a front of the tool. Each spline is curved so that it is not parallel to a plane perpendicular to the longitudinal axis of the tool. Preferably, each spline is curved in a helical shape in the axial direction. Disposed along each spline are a plurality of cutting teeth. Each tooth has a cutting face that is helical in shape. Due to this helical shape of the cutting face of each tooth, a positive radial rake angle is formed for each tooth and a positive axial rake angle is formed for each tooth. These positive rake angles enhance the characteristics of the cutting process. The top of each tooth is also curved to form radial relief for each tooth. Furthermore, each tooth disposed axially forward of another tooth along a spline has a radial height that is less than the other tooth to provide cutting relief in the axial direction for each tooth.
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