Hot melt adhesive assisted laser shock peening method for small hole of airplane structural part

A technology of laser shock strengthening and aircraft structural parts, which is applied in the field of laser shock strengthening, can solve the problems of reducing the structural quality of small holes, ablation of the inner wall of small holes, and damage of sacrificial layers, etc. simple effect

Pending Publication Date: 2022-07-01
SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, when the existing technology is used to strengthen the small holes of aircraft structural parts, since the sacrificial layer is suspended and pasted above the hole, the shock wave generated by laser irradiation is easy to damage the sacrificial layer, which makes the sacrificial layer unable to protect the material, resulting in laser irradiation. The inner wall of the small hole is ablated, which reduces the quality of the small hole structure
And when strengthening the end face of the small hole, the shock wave pressure will cause the inner wall of the small hole to bulge, thereby generating residual tensile stress, forming a new weak position, and affecting the service life of the small hole structure

Method used

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  • Hot melt adhesive assisted laser shock peening method for small hole of airplane structural part
  • Hot melt adhesive assisted laser shock peening method for small hole of airplane structural part
  • Hot melt adhesive assisted laser shock peening method for small hole of airplane structural part

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Embodiment 1

[0023] This embodiment is a laser shock strengthening method for small holes of aircraft structural parts, and the operation process is as follows figure 1 The specific process is as follows:

[0024] 1. For the 7050 aluminum alloy aircraft workpiece with a small hole structure of 5mm in diameter, put it in an ultrasonic cleaning machine for cleaning, dry it with nitrogen and install it on the fixture, paste 3M black tape on the end face of one side of the small hole, and the area where the black tape is pasted exceeds the small hole. more than 5 times the diameter.

[0025] 2. Turn the other side of the small hole upward, and use a glue gun to inject liquid hot-melt glue into the small hole. The composition of the hot-melt glue by weight percentage is: ethylene-vinyl acetate copolymer (EVA) 35%, Terpene Resin 10%, C9 Petroleum Resin 15%, Paraffin 5%, Calcium Carbonate 30%, Dibutyl Phthalate 3%, Silica 2%. The power of the glue gun is 60W. After the hot melt adhesive is soli...

Embodiment 2

[0029] This embodiment is a laser shock strengthening method for small holes of aircraft structural parts, and the specific process is as follows:

[0030] 1. For the 7050 aluminum alloy aircraft workpiece with 5mm small hole structure, put it in the ultrasonic cleaning machine for cleaning, dry it with nitrogen and install it on the fixture, paste 3M black tape on the end face of the small hole structure, and the sticking area of ​​the black tape exceeds the small hole more than 5 times the diameter.

[0031] 2. With the other side of the small hole facing upward, use a glue gun to inject liquid hot melt adhesive into the small hole. The composition of the hot melt is the same as that of Example 1. The power of the glue gun is 100W. After the hot melt glue is solidified, use a knife to remove the hot glue protruding from the surface and paste the black glue layer.

[0032] 3. Apply a water film of a confinement layer to the area to be strengthened, and strengthen the end fac...

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Abstract

The invention discloses a hot melt adhesive assisted laser shock peening method for a small hole of an aircraft structural part, and belongs to the technical field of laser shock peening. The method comprises the following steps: (1) mounting a workpiece with a small hole structure on a clamp, and pasting a sacrificial layer on one end surface; (2) the other end face faces upwards, liquid hot melt adhesive is injected, and after the hot melt adhesive is solidified, a sacrificial layer is pasted; (3) a restraint layer water film is applied to the to-be-strengthened area, laser shock strengthening is conducted on the two end faces of the small hole, and strengthening parameters are as follows: the laser energy is 5-10 J, the light spot diameter is 2-3 mm, the pulse width is 15-20 ns, the frequency is 1-5 Hz, the water film thickness is 1-2 mm, the lap joint rate is 25%-75%, and the shock frequency is 1-4 times; and (4) removing the sacrificial layer after the workpiece is subjected to laser shock peening, and removing the hot melt adhesive in the small hole by using a metal tool of which the diameter is smaller than that of the small hole. The method can ensure the strengthening effect of the laser shock peening small hole.

Description

technical field [0001] The invention relates to the technical field of laser shock strengthening, in particular to a laser shock strengthening method for small holes of aircraft structural parts assisted by hot melt adhesive. Background technique [0002] In the assembly process of aircraft parts, different parts are connected by rivets, so there are a large number of rivet holes in aircraft structural parts. In the process of assembly and use, the location around the hole is a typical stress concentration area, which bears high cyclic external load, so it is a fatigue-weak structure. Under the action of external load, fatigue micro-cracks are prone to occur around the hole, which affects the use of the aircraft. performance. Laser shock peening technology is an emerging surface treatment technology. It is very suitable for the strengthening of small holes in aircraft structural parts due to its advantages of good strengthening effect, strong controllability, and no heat-af...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D10/00
CPCC21D10/005
Inventor 孙博宇赵吉宾乔红超陆莹
Owner SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI
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