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Method for cladding wear-resisting layer on surface of runner hub of hydraulic turbine

A technology of surface coating and runner body, used in arc welding equipment, manufacturing tools, welding equipment, etc., can solve the problems of difficult strip surfacing process, difficult to guarantee the quality of the surfacing layer, and uneven thickness of the surfacing layer. , to achieve the effect of easy control, uniform thickness and improved production efficiency

Inactive Publication Date: 2012-02-22
TOSHIBA HYDRO POWER HANGZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, strip surfacing is usually used for welding on regular planes. For arcuate and spherical surfaces, especially the irregular spherical outer surface of the turbine runner body (it includes the arcuate part of the sphere, the upper and lower cylindrical surfaces, and the spherical and cylindrical surfaces) Transition and other parts), the strip surfacing process is more difficult, the quality of the surfacing layer is difficult to guarantee, and problems such as uneven thickness of the surfacing layer, excessive roughness, etc.

Method used

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  • Method for cladding wear-resisting layer on surface of runner hub of hydraulic turbine
  • Method for cladding wear-resisting layer on surface of runner hub of hydraulic turbine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] The base material of the runner body of the hydraulic turbine is ZG20SiMn carbon steel casting. The method of machining the stainless steel wear-resistant working layer on the spherical surface of the runner body is as follows:

[0073] (1) Carry out gold processing on the spherical surface of the runner body of the hydraulic turbine using a lathe to make the body size uniform and the surface smooth;

[0074] (2) Use a grinder to grind the spherical surface of the runner body, and then use acetone to remove surface oil;

[0075] (3) Adjust the position of the runner body: if figure 1 As shown, the end of the main shaft side 11 of the runner body is fixed to the rotary table 20 of the welding positioner 2, and the turning angle of the rotary table 20 is adjusted so that the position of the surfacing area of ​​the runner body is horizontal;

[0076] (4) Use a spray gun to flame-heat the weld bead area of ​​the spherical surface of the runner body to remove water vapor. O...

Embodiment 2

[0094] The base material of the runner body of the hydraulic turbine is ZG20SiMn carbon steel casting. The method of machining the stainless steel wear-resistant working layer on the spherical surface of the runner body is as follows:

[0095] (1) Carry out gold processing on the spherical surface of the runner body of the hydraulic turbine using a lathe to make the body size uniform and the surface smooth;

[0096] (2) Use a grinder to grind the spherical surface of the runner body, and then use acetone to remove surface oil;

[0097] (3) Adjust the position of the runner body: if figure 1 As shown, the end of the main shaft side 11 of the runner body is fixed to the rotary table 20 of the welding positioner 2, and the turning angle of the rotary table 20 is adjusted so that the position of the surfacing area of ​​the runner body is horizontal;

[0098] (4) Use a spray gun to flame-heat the weld bead area on the water discharge cone side 12 of the runner body to remove water...

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Abstract

The invention discloses a surface processing technology of a mechanical product, and in particularly relates to a method for cladding a wear-resisting layer on the surface of the runner hub of a hydraulic turbine, belonging to the electromechanical technical field of hydropower stations. The method comprises the following steps of: carrying out metal processing on the sphere of the runner hub; cleaning the surface of the runner hub; fixing the runner hub on a positioner, and adjusting a bead welding zone to be in a horizontal position; carrying out submerged arc strip bead welding on the sphere, and adjusting the turnover angle of the rotary table of the positioner in real time during welding, so as to maintain a weld pass in the horizontal position; carrying out metal processing on the surface of bead welding; and carrying out penetrant flaw detection and ultrasonic flaw detection. According to the method for cladding the wear-resisting layer on the surface of the runner hub of the hydraulic turbine, good quality of a bead welding layer can be ensured, the bead welding layer is even in thickness and smooth in transition, a bead welding work layer subjected to bead welding does not generate cracks and is not easy to peel off, the dilution rate of the base metal of the bead welding layer is low, and the bead welding layer has good wear resistance.

Description

technical field [0001] The invention discloses a surface processing technology of a mechanical product, in particular to a method for covering the surface of a runner body of a water turbine with a wear-resistant layer, and belongs to the technical field of hydroelectric power stations. Background technique [0002] The runner body is the key rotating part in the tubular flow unit and the axial flow unit, and the service life of the flow-passing parts of the runner body directly affects the operation efficiency and life of the whole unit. The factors that affect the service life of the flow-passing components mainly include the sediment content in the water area and the operating time of the unit, among which the sediment content in the water area is the main influencing factor. Units installed in watersheds with high sediment concentration require their flow-passing parts to have good anti-sediment wear and corrosion performance. [0003] At present, ZG20SiMn carbon steel ...

Claims

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Application Information

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IPC IPC(8): B23K9/04B23K9/235
Inventor 肖凌
Owner TOSHIBA HYDRO POWER HANGZHOU
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