| 摘要 |
When a groove having a section of Christmas tree shape for fitting the blade legs of a turbine is to be generated in the outer circumference of a turbine shaft by cutting work, cutting blades cut that groove by moving them gradually in a direction perpendicular to an axis (47) parallel to female groove center line (S) while rotating them on the axis (47). Three wide portions (4, 5 and 6) are cut one by one. A method for that grooving work includes a first cutting step of cutting a slope portion, an outer circumference portion and an undercut portion by using a first cutting tool (40), and a second cutting step of cutting a constricted portion by using a second cutting tool. |
