Energy compensated equipower density oblique laser shock method

Patent metadata

Field	Value
Publication number	US-11193183-B2
Application number	US-202017017452-A
Country	US
Kind code	B2
Filing date	Sep 10, 2020
Priority date	May 18, 2018
Publication date	Dec 7, 2021
Grant date	Dec 7, 2021

Abstract

The present invention relates to the technical field of material surface peening, and more particularly to an energy compensated equipower density oblique laser shock method. The method includes: acquiring a radius of curvature of a peening region of a part to be processed, and judging a range of a laser incident angle; determining laser parameters, such as laser pulse width, a spot diameter, and required laser energy under a vertical incidence condition; calculating the required laser energy at the minimum incident angle, and judging whether the energy falls within the technical indexes of a laser; and performing laser shock peening on the part by pulse laser beams with different energies. According to the present invention, the laser power or energy is compensated according to changes in the incident angle and the radius of curvature of the part to be processed.

First claim

What is claimed is:

1. An energy compensated equipower density oblique laser shock method, comprising the following steps:
S1. acquiring a radius of curvature R of an arc peening region of a part to be processed and morphological characteristics thereof; inputting the radius of curvature R and the morphological characteristics into a simulation software to acquire a minimum incident angle α min ; and setting a laser incident angle α to be greater than or equal to α min and be less than 90°, wherein the laser incident angle α is measured from a surface of the arc peening region;
S2: selecting laser parameters within a set range, wherein the laser parameters comprise laser pulse intensity, a diameter D of a laser spot, and required laser energy Eo when the laser incident angle α is 90 degrees;
S3. determining required laser energy E at the minimum incident angle α min ; and judging whether the laser energy E falls within a predetermined range, and proceeding to Step S4 if yes; and if no, returning to Step S2 to reselect the laser parameters; wherein the required laser energy E at the minimum incident angle α min is determined by performing steps of S31 to S32:
S31: setting the incident angle α as α min , and calculating a spot area S according to

S
=

(

2
⁢
R

-

4
⁢

R
2

-

D
2

)

⁢

∫
0

D
2

⁢

1
+

1
⁢
6
⁢

R
2

(

D
2

-

4
⁢

x
2

)

⁢

cos
2

⁢
α

⁢
dx

;

S32: calculating the required laser energy E during oblique shock according to

E
=

4
⁢

E
0

⁢
S

π
⁢

⁢

D
2

=

4
⁢

E
0

(

2
⁢
R

-

4
⁢

⁢

R
2

-

D
2

)

π
⁢

⁢

D
2

⁢

∫
0

D
2

⁢

1
+

1
⁢
6
⁢

R
2

(

D
2

Assignees

• Univ Guangdong Technology

Inventors

• Zhang Yongkang
• Lin Chaohui
• Zhou Zeming
• Zhang Zheng
• Lu Guoxin

Classifications

• B23K26/356

  by shock processing · CPC title

• B23K26/032

  using optical means · CPC title

• C21D10/005 Primary

  by laser shock processing · CPC title

• C21D7/06

  by shot-peening or the like · CPC title