Hard-soldering deformation control method for turbine blade and special fixture for hard-soldering

Abstract

The invention provides a hard-soldering deformation control method for a turbine blade. The hard-soldering deformation control method for the turbine blade can effectively reduce the hard-soldering deformation of stellite alloy sheets at the steam inlet sides of last-stage large blades of a turbine. The hard-soldering deformation control method for the turbine blade is characterized by comprising the following steps: detecting the hard-soldering deformation and deformation tendency of a test blade by comparing the blade hard-soldering area of the blade before and after the hard-soldering with a blade theoretical model, obtaining a main hard-soldering deformation area and hard-soldering deformation direction of the test blade, and when performing hard-soldering of the stellite alloy sheets to the product blade having the same specification with the test blade, using a special fixture for hard-soldering to apply an over-deformation stress with direction opposite to the hard-soldering deformation direction to the main deformation area of the product blade corresponding to the test blade. The special fixture for hard-soldering comprises a machine tool guide rail connecting seat and multiple groups of chuck mechanisms, wherein the multiple groups of chuck mechanisms are mounted on the machine tool guide rail connecting seat, and the multiple groups of chuck mechanisms are uniformly arranged along the length direction of the hard-soldering area of the stellite alloy sheet of the blade.

Description

technical field

[0001] The invention relates to the field of welding deformation control of the last-stage blade of a large-scale steam turbine, in particular to the field of control of the corrosion-proof brazing deformation of the Stellite alloy sheet of the last-stage blade of a steam turbine, specifically a method for controlling the brazing deformation of a large steam turbine blade and brazing Special fixture device. Background technique

[0002] The steam inlet side of the last stage blade of a large steam turbine is corroded due to the erosion of wet steam and condensed water droplets during operation, and brazing Stellite alloy sheets on the steam inlet side of the blade is currently the most effective anti-corrosion measure. Used by the steam turbine design factory. However, the anti-corrosion brazing of the steam inlet edge of the last stage blade of the steam turbine will be deformed due to the influence of welding heat effect, so it directly affects the dimensi...

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