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Method for extruding and strengthening 7B50-T7751 aluminum alloy thick plate holes

A 7B50-T7751, plate hole technology, applied in the field of aluminum alloy surface strengthening, to achieve the effect of improving fatigue performance, reducing design requirements, and improving notch sensitivity

Inactive Publication Date: 2011-06-01
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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Problems solved by technology

However, there are few reports on the literature and patents on improving the performance of the alloy.

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  • Method for extruding and strengthening 7B50-T7751 aluminum alloy thick plate holes

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Embodiment Construction

[0011] Below in conjunction with embodiment technical solution of the present invention will be described in further detail:

[0012] This kind of 7B50-T7751 thick plate hole extrusion strengthening method, the chemical composition and weight percentage of 7A55 aluminum alloy are shown in Table 1, the heat treatment system of 7B50 thick plate parts is T7751, and the smoothness of the hole wall surface is Ra1.6. A tapered metal mandrel is inserted into the hole, and mechanical pressure is applied to the end of the mandrel, so that the largest diameter part of the mandrel passes through the hole of the workpiece and then the pressure is stopped. The extrusion amount is 2 to 4%. The so-called extrusion The amount refers to the percentage of the deformation of the hole diameter of the workpiece to the original diameter of the hole. The hole edge distance of the workpiece hole is ≥1.7. The so-called hole edge distance refers to the ratio of the nearest distance from the center of t...

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Abstract

The invention provides a method for extruding and strengthening 7B50-T7751 aluminum alloy thick plate holes, wherein the heat treating regime of a 7B50 thick plate is T7751; the fineness of the surface of a hole wall is Ra 1.6; a tapered metal core rod is inserted into the hole; a mechanical pressure is applied on the end part of the core rod; pressurization is stopped after the part, having the maximum diameter, of the core rod passes through the hole of a processed part; the extrusion quantity, which means the percentage of deformation quantity of the diameter of the processed part to the original diameter of the hole, is 2-4%; the hole edge distance of the hole of the processed part is more than or equal to 1.7; and the hole edge distance means the ratio of the shortest distance between the center of the hole of the processed part and the edge of the thick plate to the diameter of the hole of the processed part. Compared with the prior art, the invention has the advantages that the fatigue strength of the 7B50-T7751 thick plate processed by using the technical scheme of the invention is increased to 17 times of the fatigue strength of the processed parts which are not strengthened, the operation technique is simple and convenient, and the method is beneficial to the production control.

Description

technical field [0001] The invention is a 7B50-T7751 aluminum alloy thick plate hole extrusion strengthening method, which belongs to the aluminum alloy surface strengthening technology. Background technique [0002] 7B50-T7751 aluminum alloy thick plate not only has high strength, but also has excellent fracture toughness, stress corrosion resistance and good hardenability, especially the pre-stretched ultra-thick plate over 60mm is more suitable for the manufacture of large overall structural parts. At present, the development trend of aircraft structure design is widely used as the main load-bearing structural parts such as the overall frame, beam, wing panel and so on of the aircraft. At present, the research on the alloy mainly focuses on the billet making method, the development of new forming processing technology and heat treatment system and so on. However, there are few reports on the literature and patents on improving the performance of the alloy. Contents of ...

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Application Information

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IPC IPC(8): C22F1/053
Inventor 张坤刘铬龚澎宋德玉黄敏
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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