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Laser shock peening method of blisk

A technology of laser shock strengthening and integral blisk, applied in the field of integral blisk laser shock strengthening, can solve the problems of the influence of surface roughness and size, the difficulty of implementing irregular surface parts, the deformation of thin-walled parts, etc. High frequency vibration fatigue life improvement and high efficiency

Active Publication Date: 2014-07-02
SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional strengthening technology for a single blade is shot peening. Shot peening is difficult to implement on parts with irregular surfaces, and it is easy to cause deformation of thin-walled parts, which may have an impact on surface roughness and size.

Method used

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  • Laser shock peening method of blisk
  • Laser shock peening method of blisk
  • Laser shock peening method of blisk

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0203] Specimen material: TC17 titanium alloy blisk.

[0204] Pretreatment of the workpiece: first clean it with acetone to remove the oil on the surface, and then put it in the air shower for 5 minutes to remove the dust on the surface of the leaf disc (13).

[0205] Laser shock strengthening process parameters: ①The constrained layer uses deionized water, the resistivity of deionized water reaches 18 trillion, the thickness of the constrained layer is 1mm, and the thickness is uniform; ②The left focusing optical path and the right focusing optical path output a single pulse energy of 6J, The pulse width is 15ns, the diameter of the circular spot is 3mm, the left and right uniform light paths output a single pulse energy of 7J, the pulse width is 15ns, and the side length of the square spot is 3mm; the overlapping rate of the circular spot is 30%, and the square spot The overlap rate is 15%.

Embodiment 2

[0207] Pretreatment of the workpiece: first clean it with acetone to remove the oil on the surface, and then put it in the air shower for 5 minutes to remove the dust on the surface of the leaf disc (13).

[0208] Laser shock strengthening process parameters: ① The constrained layer uses deionized water, the resistivity of deionized water reaches 18 trillion, the thickness of the constrained layer is 2 mm, and the thickness is uniform; ② The left and right focus optical paths output single pulse energy of 10J, The pulse width is 120ns, the diameter of the circular spot is 3mm, the left and right uniform light paths output a single pulse energy of 10J, the pulse width is 20ns, and the side length of the square spot is 3mm; the overlapping rate of the circular spot is 20%, and the square spot The overlap rate is 5%.

Embodiment 3

[0210] Pretreatment of the workpiece: first clean it with acetone to remove the oil on the surface, and then put it in the air shower for 5 minutes to remove the dust on the surface of the leaf disc (13).

[0211] Laser shock strengthening process parameters: ① The constrained layer uses deionized water, the resistivity of deionized water reaches 18 trillion, the thickness of the constrained layer is 1.5mm, and the thickness is uniform; ② The left and right focus optical paths output a single pulse energy of 8J , pulse width 18ns, diameter of circular spot is 3mm, left uniform light path and right uniform light path output single pulse energy 9J, pulse width 17ns, square spot side length is 3mm; circular spot overlap rate is 24%, square The overlapping rate of the spot is 8%.

[0212] The mechanical properties before and after laser shock peening of the overall blisks of the above-mentioned Examples 1-3 are shown in Table 1.

[0213] Table 1 Mechanical properties of the whole...

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Abstract

The invention discloses a laser shock peening method of a blisk. The method is below: first installing the blisk on a flange at the terminal of a trajectory robot through a fixture; then setting an optical system to a third optical path (9) working state, a first optical path (15) working state, a fourth optical path (10) working state, a second optical path (14) working state, the fourth optical path (10) working state and the second optical path (14) working state in order; and respectively conducting laser shock peening on a blade back trailing edge region (3), a blade basin leading edge region (6), a blade basin trailing edge region (4), a blade back leading edge region (1), a blade basin tip region (5) and a blade back tip region (2) of a blisk blade. The laser shock peening method provided by the invention is simple, and after laser shock peening, the blisk has residual pressure stress reaching above 300 MPa, high frequency vibration fatigue life increased by about 6-30 times, and little deformation of the workpiece.

Description

technical field [0001] The invention relates to the technical field of application in the surface treatment of an aeroengine integral blisk blade, in particular to a laser shock strengthening method for an integral blisk. Background technique [0002] Laser shock strengthening technology uses plasma shock waves generated by strong laser beams, which can generate compressive surface residual stress on the surface of workpieces with a depth greater than 1mm, improve the damage resistance margin and fatigue performance of blades, and be compatible with the surface of metal materials such as cold extrusion and shot peening. Compared with strengthening methods, it has outstanding advantages such as non-contact, no heat-affected zone, strong controllability and remarkable strengthening effect. The damage resistance and fatigue performance of the laser shock strengthened blade are greatly improved, and even when the edge gap of the strengthened blade is less than 3mm, its service l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D7/00C21D1/09
Inventor 乔红超刘伟军赵吉宾于彦凤
Owner SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI
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