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A Machining Technology of Steam Turbine Blade Using Laser Cladding and Anti-corrosion

A technology of steam turbine blade and laser cladding, which is applied in the processing field of steam turbine blades, can solve the problems of large residual stress, poor lap surface quality, and large tool loss, so as to ensure the quality of cladding, ensure the machining dimensional accuracy, and prevent correction. cracking effect

Active Publication Date: 2015-12-30
WUXI TURBINE BLADE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Compared with the traditional brazing laser cladding, although it has obvious advantages, it also has its own characteristics, such as large residual stress after laser cladding, easy cracking after large correction, large tool loss due to high hardness, and poor lap surface quality. The application characteristics of cladding technology on steam turbine blades, it is very important to redesign and explore the manufacturing process of steam turbine blades, and rationally arrange the laser cladding process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A steam turbine final stage blade using 0Cr17Ni4Cu4Nb stainless steel material, its processing technology is as follows:

[0026] (1) Blank making: the raw materials are upset, blade root neck pressing and blade body elongation, blade top lap forming and blade crown neck pressing, blade body elongation and boss forming, blade body front billet forming, blade The root flattening step distributes the raw material according to the shape of the blade;

[0027] (2) Die forging: After 2~5 fires, the billet is forged to be close to the shape of the blade, and the margin on one side of the blade is 3mm;

[0028] (3) Heat treatment, the blade forgings undergo solid solution, adjustment, and aging heat treatment in sequence to make the performance of the blade meet the requirements;

[0029] (4) Rough milling of the blank profile and milling of the laser cladding slot: the blade is processed to the back arc profile and the inner arc profile by milling to retain a 2mm margin, and...

Embodiment 2

[0039] A steam turbine final stage blade using 0Crl3Ni8Mo2Al stainless steel material, its processing technology is as follows:

[0040] (1) Blank making: the raw materials are upset, blade root neck pressing and blade body elongation, blade top lap forming and blade crown neck pressing, blade body elongation and boss forming, blade body front billet forming, blade Root flattening, leaf body bending and other steps distribute raw materials according to the shape of the blade;

[0041] (2) Die forging: after 2~5 times of forging until it is close to the shape of the blade, the margin on one side of the blade is 4mm;

[0042] (3) Heat treatment: solid solution treatment and cryogenic treatment are carried out on the leaves in sequence;

[0043] (4) Rough milling of the rough surface and milling of the laser cladding groove: the blade is processed by milling to the inner arc surface of the back arc surface with a margin of 2mm; and the size of the cladding groove is milled to wi...

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Abstract

The invention provides a machining technology of a turbine blade with water corrosion prevention achieved by means of laser cladding. According to the machining technology of the turbine blade, the machining precision of the blade can be guaranteed, the fusion cladding amount is small, and tool loss is reasonable. The machining technology of the turbine blade with the water corrosion prevention achieved by means of laser cladding comprises the steps of (1) blank manufacturing; (2) forming through die forging; (3) heat treatment; (4) rough milling of the molded surface of a blank and milling of a laser cladding groove, wherein a certain redundant amount of a forge piece is removed through milling, and the laser cladding groove is machined until the laser cladding groove is within a certain tolerance range; (5) laser cladding of stellite in the laser cladding groove; (6) correction of a blade by means of a pressing machine after laser cladding; (7) radiographic and penetration inspection of a laser cladding area; (8) repairing welding of an unqualified portion, in the laser cladding area, of the blade through argon arc welding; (9) distressing and heat treatment; (10) comprehensive milling, wherein the blade is machined until the blade is within the tolerance range; (11) polishing, wherein machining tool marks on the surface of the blade are removed through polishing; (12) shot blasting of the surface of the blade.

Description

technical field [0001] The invention relates to the technical field of processing steam turbine blades, in particular to the processing field of steam turbine blades which adopt laser cladding method for anti-corrosion treatment, in particular to a processing technology of steam turbine blades adopting laser cladding anti-corrosion treatment. Background technique [0002] Laser cladding Stellite alloy is currently a relatively new technology for strengthening the anti-corrosion surface of blades. This technology uses laser to melt Stellite alloy powder and rapidly cool it to form a metallurgical bond with the blade matrix. It utilizes the high hardness and high hardness of Stellite alloy. Wear resistance is used to improve the water erosion resistance of blades, which has higher bonding strength than traditional brazing, and can be directly repaired on steam turbines. [0003] Compared with the traditional brazing laser cladding, although it has obvious advantages, it also h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/02
CPCB23P15/02
Inventor 张铁磊王进王烜烽
Owner WUXI TURBINE BLADE
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