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Combined strengthening method of alloy structural hole

A technology of structural holes and alloys, applied in the field of material surface strengthening, can solve the problems of fracture, stress concentration, and high alloy notch sensitivity, and achieve the effects of small damage, improved fatigue life, and uniform expansion.

Inactive Publication Date: 2014-07-30
北京航为高科连接技术有限公司
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Problems solved by technology

[0004] In order to solve the problem that the common current structural separation surface usually adopts mechanical connection method, due to the high notch sensitivity of the alloy, it is easy to produce stress concentration and fracture when it is subjected to alternating loads

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  • Combined strengthening method of alloy structural hole
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  • Combined strengthening method of alloy structural hole

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Embodiment Construction

[0032] The combination strengthening method of the alloy structure hole according to the present invention will be further described in detail below in conjunction with the accompanying drawings. A combined strengthening method for alloy structure holes, characterized in that the combined strengthening method for alloy structure holes comprises the following steps:

[0033] Step 1. Design the diameter of the initial hole and the diameter of the final hole according to the amount of interference, the amount of reinforcement, and the diameter of the interference bolt;

[0034] Step 2, making an initial hole on the surface of the alloy plate according to the diameter of the initial hole in step 1;

[0035] Step 3, performing cold extrusion on the primary hole to form the final hole;

[0036] Step 4, installing interference bolts in the end holes.

[0037] Specifically, in step 1, the interference amount is 0.05mm-0.14mm, the strengthening amount is 3%-5%, and the diameter of th...

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Abstract

The invention provides a combined strengthening method of an alloy structural hole. The combined strengthening method comprises the following steps: step 1) designing an initial hole diameter and a final hole diameter according to interference value, strengthening amount and an interference bolt; step 2) making an initial hole on the surface on an alloy plate according to the initial hole diameter in the step 1); step 3) forming a final hole by performing cold extrusion on the initial hole; step 4) mounting the interference bolt in a final hole. The combined strengthening method of the alloy structural hole combines the characteristics of good implementation and high efficiency of a hole cold extrusion strengthening process and small damages and relatively uniform expansion of an electromagnetic riveting interference mounting method; by adopting the combined strengthening method, the anti-fatigue performance of the 7050-T7451 aluminum alloy structural hole is greatly improved.

Description

technical field [0001] The invention relates to the technical field of material surface strengthening, in particular to a combined strengthening method of alloy structure holes. Background technique [0002] 7050-T7451 aluminum alloy not only has high strength, but also has good fracture toughness and stress corrosion resistance, and is widely used in key load-bearing structural parts such as aircraft wing panels, frames, and beams. At present, the structural separation surface is usually connected mechanically. Due to the high notch sensitivity of the alloy, it is prone to stress concentration and fracture when subjected to alternating loads. Therefore, the failure of parts mostly occurs in the form of fatigue, especially the fatigue damage of parts with bolt holes due to stress concentration at the edge of the hole. [0003] The main connection method used in aircraft structural parts is mechanical connection. There are about 1.5 to 2 million rivets and bolts on a large a...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/04
Inventor 赵庆云刘风雷黄宏刘华东
Owner 北京航为高科连接技术有限公司
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