| 摘要 |
PURPOSE:To enhance the reliability and life to turbine as well as simply reclaim a rotor by a method in which the padding of a material whose thermal expansion coefficient is smaller than the base material of the rotor is provided on the surface of the turbine rotor. CONSTITUTION:A surface 19 as shown by surface contours 19a and 19b is provided for the surface of the rotor 13 in the high- and medium pressure stage 1 in high- and medium pressure steam turbines. The basal portion of a disc, as shown by a round mark A, is shaped into a circular arc form with an intention of relieving the concentration of stress. In this case, the surface contours 19a and 19b and the circular arc-shaped portion are made of paddings 18a-18c of a proper thickness formed from the contour 20, as shown by the oblique line. The material of the padding is high-Cr steels such as 12 Cr-steel, etc., in the case where the base material of the rotor 13 is a low-Cr steel such as Cr-Mo-V steels, etc., having a smaller thermal expansion coefficient than the base material of the rotor 13. |
