Shot blasting check method for surface defects of blades

An inspection method and shot peening technology, applied in the direction of measuring devices, instruments, and mechanical devices, can solve the problems of unobvious mild surface defects, expensive surface non-destructive hardness testers, and serious environmental pollution.

Active Publication Date: 2009-09-02
WUXI TURBINE BLADE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Non-destructive surface hardness method, which is to test the hardness of 100% of the surface by purchasing a non-destructive surface hardness tester to see if the hardness value is consistent. Missing inspection in some places is inevitable; the pickling method is to put the leaves in the heating acid solution for a certain period of time, and then take them out to check the uniformity of the surface. The disadvantage is that large pickling equipment is required, which seriously pollutes the environment. , the waste acid solution is difficult to handle, and it is not obvious for mild surface defects, such as mild work hardening on the surface

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1. Install the blade into the special shot peening fixture according to the process plan, position, lock and fix;

[0021] 2. Select a nozzle with a caliber of 6mm, 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, and the distance between the nozzle and the surface to be sprayed is 400mm; the moving speed of the nozzle is 285mm / min; the distance between the spray flow and the surface to be sprayed The included angle is about 60 degrees; the nozzle is made of T7 or T8 tool steel and quenched to a hardness of 52.5HRC;

[0022] 3. Select steel wire cut shot with a diameter of 2mm;

[0023] 4. Adjust the shot peening pressure to 0.35MPa; shot peening intensity: 0.8mmA

[0024] 5. Before shot peening the product, spray A test piece first, the arc height of A test piece is 0.1mm; install A test piece in a special shot peening fixture, and use the same process parameters as the produc...

Embodiment 2

[0030] 1. Install the blade into the special shot peening fixture according to the process plan, position, lock and fix;

[0031] 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: 500mm / min; the jet flow and the surface to be sprayed The included angle is about 30 degrees; the nozzle is made of T7 or T8 tool steel and quenched to a hardness of 52.5HRC

[0032] 3. Select S170 cast steel shot with a diameter of 0.2mm;

[0033] 4. Adjust the shot peening pressure at 0.6MPa; shot peening intensity: 0.45mmA

[0034] 5. Before shot peening the product, spray A test piece first, the arc height of A test piece is 0.4mm; install A test piece in a special shot peening fixture, use the same process parameters as the product shot peening to A The test p...

Embodiment 3

[0040] 1. Install the blade into the special shot peening fixture according to the process plan, position, lock and fix;

[0041] 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: 30mm / min; the jet flow and the surface to be sprayed The included angle is about 90 degrees; the nozzle is made of T7 or T8 tool steel and quenched to a hardness of 52.5HRC

[0042] 3. Select S170 steel wire cut shot with a diameter of 1.1mm;

[0043] 4. Adjust the shot peening pressure to 0.1MPa; shot peening intensity: 0.1mmA

[0044] 5. Before shot peening the product, spray A test piece first, the arc height of A test piece is 0.1mm; install A test piece in a special shot peening fixture, and use the same process parameters as the product shot peening to A The te...

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Abstract

The invention relates to a shot blasting check method for surface defects of blades. Turbine blades processed by the method can clearly show various surface defects easily generated in materials during processes, and specifically the method can check that the defects are the liquation of the materials, various processing burns, hardening and the like in the processes. The method is characterized in that the method for surface shot blasting achieves the show of the surface defects of the blades.

Description

technical field [0001] The invention relates to the technical field of inspection methods for surface defects of steam turbine blades, in particular to a shot peening inspection method for surface defects of blades. Background technique [0002] During the processing of steam turbine blades, various surface defects are prone to occur due to the raw materials themselves and the processing process. The existence of these defects will lead to fatigue cracks in the steam turbine blades during use, and water erosion and corrosion will easily occur, causing the blades to be damaged early , the hazard is extremely serious, which is not allowed to exist in the use of steam turbine blades. [0003] In the past, the inspection methods of blade surface defects mainly included surface non-destructive hardness method and pickling method. Non-destructive surface hardness method, which is to test the hardness of 100% of the surface by purchasing a non-destructive surface hardness tester t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N19/00
Inventor 揭念柱夏冰
Owner WUXI TURBINE BLADE
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