A laser hardening method for the steam inlet side of a large thickness steam turbine blade

A large-thickness, steam-turbine technology, used in furnaces, furnace types, heat treatment equipment, etc., can solve problems such as inability to meet hardening requirements, and achieve the effect of easy implementation, meeting hardening requirements, and simple process

Active Publication Date: 2021-02-09
WUXI TURBINE BLADE
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A laser hardening method for the steam inlet side of a large thickness steam turbine blade
  • A laser hardening method for the steam inlet side of a large thickness steam turbine blade
  • A laser hardening method for the steam inlet side of a large thickness steam turbine blade

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] In this embodiment, a method for laser hardening of the steam inlet side of a large-thickness steam turbine blade comprises the following steps: 1) pretreatment, before laser hardening of the blade, the hardened area of ​​the blade is first degreased, dedusted, and brushed Light absorbing agent and drying to increase the absorption of laser energy in the laser irradiation area; 2) Laser hardening, laser hardening is performed on the back of the blade according to the required size, the speed of back arc laser hardening is 80mm / min, the hardening temperature is 1400°C, laser hardening Use an infrared thermometer to monitor the hardening temperature in real time, and adjust the input laser power according to the temperature measurement results to ensure that the temperature of the spot irradiation area is uniform throughout the process, without large fluctuations, and the hardening is completed on the back arc surface Immediately after that, laser harden the inner arc of t...

Embodiment 2

[0027] In this embodiment, a method for laser hardening of the steam inlet side of a large-thickness steam turbine blade comprises the following steps: 1) pretreatment, before laser hardening of the blade, the hardened area of ​​the blade is first degreased, dedusted, and brushed Light absorbing agent and drying to increase the absorption of laser energy in the laser irradiated area; 2) Laser hardening, laser hardening is performed on the back of the blade according to the required size, the speed of back arc laser hardening is 115mm / min, the hardening temperature is 1600°C, laser hardening Use an infrared thermometer to monitor the hardening temperature in real time, and adjust the input laser power according to the temperature measurement results to ensure that the temperature of the spot irradiation area is uniform throughout the process, without large fluctuations, and the hardening is completed on the back arc surface Immediately after that, laser harden the inner arc of t...

Embodiment 3

[0029] In this embodiment, a method for laser hardening of the steam inlet side of a large-thickness steam turbine blade comprises the following steps: 1) pretreatment, before laser hardening of the blade, the hardened area of ​​the blade is first degreased, dedusted, and brushed Light absorbing agent and drying to increase the absorption of laser energy in the laser irradiation area; 2) Laser hardening, laser hardening on the back of the blade according to the required size, the speed of back arc laser hardening is 150mm / min, the hardening temperature is 1800°C, laser hardening Use an infrared thermometer to monitor the hardening temperature in real time, and adjust the input laser power according to the temperature measurement results to ensure that the temperature of the spot irradiation area is uniform throughout the process, without large fluctuations, and the hardening is completed on the back arc surface Immediately after that, laser harden the inner arc of the blade. Th...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
hardeningaaaaaaaaaa
Login to view more

Abstract

The invention discloses a laser hardening method for the steam inlet edge of a large-thickness blade of a steam turbine. The method comprises the following steps: 1) pretreatment. Before the laser hardening of the blade, the hardened area of ​​the blade is degreasing and dust-removed, and the blade is decorated to absorb light. 2) Laser hardening, laser hardening the back of the blade according to the required size, and laser hardening the inner arc of the blade immediately after the back arc surface hardening is completed, two hardening procedures are carried out continuously; 3) Cooling, the laser hardening 4) Tempering, the laser-hardened blade is subjected to tempering heat treatment; 5) Polishing, the hardened area of ​​the tempered blade is polished; 6) Hardness testing. The above-mentioned laser hardening method for the steam inlet edge of the large-thickness blade of the steam turbine adopts a new process of back arc hardening and internal arc hardening, which can perform laser hardening on the hardened area with a large width of the inner back arc and meet the hardening requirements of the blade, and the process is simple. Easy to implement.

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...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/09C21D9/00
Inventor 翟永杰胡仁杰汤先辉王鹏浩
Owner WUXI TURBINE BLADE
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap