Blade root surface strengthening method

A surface strengthening, blade technology, applied in blade support elements, engine elements, machines/engines, etc., to solve problems such as fatigue, discontinuity of stress state, etc.

Inactive Publication Date: 2009-02-04
WUXI TURBINE BLADE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, rolling strengthening has its own unavoidable shortcomings, which are as follows: 1) It is necessary to choose suitable and expensive rolling equipment (rolling wheels, rollers, etc.); 2) The stress state of the rolling part is compressive stress, However, the adjacent non-rolled parts show a state of tensile stress, that is, the stress state is discontinuous (as shown in Figure 2), and fatigue defects are prone to occur in the parts showing a state of tensile stress

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Install the blade into the special shot blasting fixture according to the process plan, position, lock and fix;

[0035] (2) Select a nozzle with a caliber of φ6mm, adjust the position of the spray gun and the surface to be sprayed so that the spray gun is perpendicular to the bottom surface of the tooth, the distance between the nozzle and the surface to be sprayed: 400mm; the moving speed of the nozzle: 285mm / min; the jet flow and the surface to be sprayed The included angle of the spray surface is about 60 degrees; the nozzle is made of T7 or T8 tool steel and quenched to a hardness of 52.5HRC

[0036] (3), select the cast steel shot or steel wire cut shot that diameter is 2mm for use;

[0037] (4), adjust the compressed air pressure at 0.15MPa; shot blasting pressure: 0.4MPa

[0038] (5) Before shot-peening the product, first spray the A test piece, the arc height of the A test piece is 0.39mm; install the A test piece in a special shot peening fixture, and use...

Embodiment 2

[0045] (1) Install the blade into the special shot blasting fixture according to the process plan, position, lock and fix;

[0046] (2) Select a nozzle with a caliber of φ9mm, adjust the position of the spray gun and the surface to be sprayed so that the spray gun is perpendicular to the bottom surface of the tooth, the distance between the nozzle and the surface to be sprayed: 50mm; the moving speed of the nozzle: 500mm / min; the jet flow and the surface to be sprayed The included angle of the spray surface is about 90 degrees; the nozzle is made of T7 or T8 tool steel and quenched to a hardness of 50HRC

[0047] (3), select cast steel shot or steel wire cutting shot with a diameter of 0.85mm;

[0048] (4), adjust the compressed air pressure at 0.37MPa; shot blasting pressure: 0.7MPa

[0049] (5) Before shot-peening the product, first spray the A test piece, the arc height of the A test piece is 0.08mm; install the A test piece in a special shot peening fixture, and use the s...

Embodiment 3

[0056] (1) Install the blade into the special shot blasting fixture according to the process plan, position, lock and fix;

[0057] (2) Select a nozzle with a caliber of φ12mm, adjust the position of the spray gun and the surface to be sprayed so that the spray gun is perpendicular to the bottom surface of the tooth, the distance between the nozzle and the surface to be sprayed: 225mm; the moving speed of the nozzle: 30mm / min; the jet flow and the surface to be sprayed The included angle of the spray surface is about 30 degrees; the nozzle is made of T7 or T8 tool steel and quenched to a hardness of 55HRC

[0058] (3), select cast steel shot or steel wire cutting shot with a diameter of 1.5mm;

[0059] (4), adjust the compressed air pressure at 0.6MPa; shot blasting pressure: 0.1MPa

[0060](5) Before shot-peening the product, first spray the A test piece, the arc height of the A test piece is 0.70mm; install the A test piece in a special shot peening fixture, and use the sam...

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Abstract

The invention relates to a blade and root surface strengthening method. The parts which are treated by the method and the untreated parts are naturally transited and both belong to the compressive stress state, so that the untreated parts can not generate fatigue sources and can meet the technical requirements of rolling strengthening. The method is characterized in that a surface shot blasting method is adopted to realize the blade and root surface strengthening.

Description

technical field [0001] The invention relates to the technical field of surface strengthening technology of fan blades, in particular to a method for strengthening the surface of blade roots. Background technique [0002] During the use of the last stage, the second last stage, and the last three-stage arc-shaped blade root blades of the steam turbine, the weaker part is the bearing part of the blade root. Since this part is subjected to high stress and alternating stress during work, It is very easy to produce local fatigue damage, and special processing should be used for this part. [0003] The original treatment method is to apply compressive stress to the part, and the method of improving the fatigue strength of the part includes rolling strengthening, which is a chip-free processing. A certain pressure is applied to the surface of the workpiece by a certain form of rolling tool. At room temperature, the plastic deformation of the metal is used to flatten the microscop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D7/06F01D5/14
CPCY02P10/20
Inventor 揭念柱夏冰杨海东
Owner WUXI TURBINE BLADE
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