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Laser anti-corrosion and wear-resistant process for trunnion of movable guide vanes of turbines

A movable guide vane, anti-corrosion and wear-resistant technology, applied in metal material coating process, coating, etc., can solve the problems of high cost, poor safety, extended maintenance time, etc., to prolong service life, reduce maintenance cost, and reliable operation sex-enhancing effect

Inactive Publication Date: 2010-01-20
岳阳大陆激光技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method takes up a lot of manpower and material resources, prolongs the maintenance time, has poor safety and extremely high cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0017] 1. All the journal surface repairs of the corroded and eroded movable guide vanes are carried out on-site or off-line by laser cladding and mechanical processing.

[0018] 2. Main equipment and required conditions for project implementation:

[0019] 1. Main equipment for on-site operation: 5KW CO2 laser generator; frequency conversion constant temperature chiller; CNC control cabinet; five-axis four-link CNC machine tool; special powder feeder for laser processing; CW61180×8000 lathe; workpiece support wheel with a maximum support load of 30T ; Air compressors and some other auxiliary equipment.

[0020] 2. Required site conditions: a 150m 2 On-site equipment placement operation area; construction power supply; necessary safety protection isolation facilities, simple fire extinguishers and auxiliary facilities.

[0021] 3. Preliminary preparation and workpiece pretreatment

[0022] 1. According to the size of the movable guide vane and the needs of laser cladding pr...

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PUM

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Abstract

The invention relates to a laser anti-corrosion and wear-resistant process for the trunnion of movable guide vanes of turbines. The process comprises the following steps: useing liquid penetrant test detection to detect the whole guide vane trunnion so as to determine cracks, air cavities and slag in the erosive wear area; and making balancing weights according to the shape and poise error of the guide vanes; removing the fatigue layer of the erosive wear area of the guide vanes; and carrying out cleaning technology treatment after clearing. A special powder feeding device is used to carry out laser cladding for special alloy materials which have good fusion property, high bonding strength and good anti-corrosion and wear-resistant properties. The specific parameters of the cladding process are as follows: the laser power is 3,200W, the spot diameter is 3.2 mm, the latus spots are used, the scanning speed of numerical control programming is 700 mm / min, the lapping rate is 25%, argon protection is used, and the alloy materials are delivered into the melting bath of laser cladding in an angle of 15 DEG by a special laser powder feeding device in a synchronous powder feeding way. All movable guide vanes to be repaired in the invention do not need sending to the manufacturer for treating, huge transport expenditure is not needed, and the whole repair period can be greatly shortened.

Description

technical field [0001] The invention relates to the laser cladding technology, and in particular provides a new process method of using the laser cladding technology to form a laser composite anti-corrosion and wear-resistant layer on the journal of the movable guide vane of the water turbine unit of the hydroelectric power station. Background technique [0002] Most of the large-scale hydroelectric power stations in my country still have a considerable proportion of water turbines put into use in the 1970s and 1980s. The water turbine is one of the core equipment of the power station, and the movable guide vane is the core key component of the water turbine. Its operation Good or bad will directly bring serious consequences to the operation of the unit. Because the sediment content of the major rivers is relatively high, it has caused serious damage to various components of the turbine, especially the corrosion and erosion of the journals of the movable guide vanes, which dir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10
Inventor 罗云周武军倪勇仁王彦林
Owner 岳阳大陆激光技术有限公司
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