Method for performing laser hardening on leading edge on large-thickness blade of steam turbine

Abstract

The invention discloses a method for performing laser hardening on a leading edge on a large-thickness blade of a steam turbine. The method comprises the following steps of (1) performing pretreatment: before the blade is subjected to laser hardening, performing oil removing, dust removing, light absorbing agent brushing and drying on a hardening region of the blade; (2) performing laser hardening: according to required dimension, performing laser hardening on the back surface of the blade, and after the hardening on the back arc surface is completed, immediately performing laser hardening onan inner arc of the blade, wherein the two hardening procedures are continuously performed; (3) performing cooling: enabling the blades after laser hardening to stand for cooling; (4) performing tempering: performing tempering thermal treatment on the blades after laser hardening; (5) performing polishing: performing polishing on the hardened region of the tempered blade; and (6) performing hardness detection. According to the method for performing laser hardening on the leading edge on the large-thickness blade of the steam turbine disclosed by the invention, a new technology of combining back arc hardening with inner arc hardening is adopted, so that laser hardening can be performed on the inner back arc and a hardening region having large width dimension, the hardening requirement of the blade is met, and the technology is simple and easy to realize.

Description

technical field [0001] The invention relates to a steam turbine blade processing technology, in particular to a laser hardening method for the steam inlet edge of a large-thickness steam turbine blade. Background technique [0002] In the production process of steam turbine blades, a certain product that needs to be laser hardened on the inlet edge of the X12CrNiMoV blade is encountered. Hardened zone size requirements are as follows: see figure 1 and figure 2 as shown, figure 1 It is a schematic diagram of the back arc hardening area of ​​a large thickness blade of a steam turbine, figure 2 It is a schematic diagram of the inner arc hardening area of ​​a large thickness blade of a steam turbine, figure 1 and figure 2 Middle A is the apex of the blade inlet edge, D1 is the back arc hardening width, D1 is the inner arc hardening width, the total length of the blade inlet edge apex hardening area is 200mm from the top of the blade, and the required distance from the to...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a laser hardening method for the steam inlet side of the large-thickness blade of the steam turbine to solve the problem in the prior art that only laser hardening on the back arc cannot meet the hardening requirements when the large-thickness blade of the steam turbine is hardened

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