| 摘要 |
PURPOSE:To aim at improving an insert shroud in its strength per area, by performing a grinding under on four corners of an integral cover into which the insert shroud is inserted in a direction of turbine rotation. CONSTITUTION:A lap-form grinding undercut is machined on four corners in space between blades of an integral cover 3 of a bucket 2 where an insert shroud is inserted in a turbine rotational direction 6 whereby voids 9 and 10 are installed in both axial and radial directions of a turbine shaft. Thus the insert shroud can be straightened so well without froming a radius-form grinding undercutting part between its blades, so that stress concentration may be avoided and, what is more, improvements in its strength per area is well promotable. |
