Joint Turbine Rotor Bend Correction by Local Heating and Cooling

The invention changes the physical state of the metal material by controlling temperature parameters during local heating. By heating the convex portion to specific temperature ranges (including transformation points for steels), the material undergoes phase changes that enable plastic deformation and bend correction, providing a more versatile solution compared to conventional mechanical methods.

The invention utilizes phase transitions of metal materials during heating and cooling processes. When the convex portion is heated to transformation temperatures and then cooled, the material undergoes phase changes (such as austenite to martensite transformation in steels) that create plastic deformation to correct the bend, expanding the适用范围 beyond what conventional methods can achieve.

The invention applies local heating only to the convex portion of the bent rotor rather than heating the entire rotor. This localized approach concentrates thermal energy where needed to induce plastic deformation for bend correction, while minimizing the overall thermal impact on the rotor structure and reducing the risk of widespread material hardening and cracking.

The heating and cooling process is performed in controlled cycles with specific temperature ranges and holding times. By using periodic thermal action with controlled parameters including transformation points, the invention achieves gradual plastic deformation that corrects the bend while allowing the material to undergo controlled phase transitions that reduce residual stresses and minimize hardening effects.