Tool and method for strengthening friction extrusion of structural member connecting hole

A technology for connecting holes and structural parts, applied in the field of machining, can solve problems such as narrow application range, cumbersome operation, complex process, etc., to enhance the ability of initiation and expansion, improve the stress environment, and improve the effect of wall surface quality.

Inactive Publication Date: 2016-08-17
SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the technical cost of laser shock strengthening is too high and the process is complicated. At present, it is only used as a supplement to other strengthening technologies.
[0008] In summary, the existing pore strengthening technology has problems such as unsatisfactory strengthening effect, cumbersome operation, low efficiency, narrow application range and high cost.

Method used

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  • Tool and method for strengthening friction extrusion of structural member connecting hole
  • Tool and method for strengthening friction extrusion of structural member connecting hole
  • Tool and method for strengthening friction extrusion of structural member connecting hole

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Experimental program
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Embodiment 1

[0055] In this embodiment, the connection holes on the aluminum alloy structural parts are strengthened by friction extrusion, wherein the mother plate is a 2mm thick 7B04 aluminum alloy sheet, and the diameter of the connection holes before strengthening is 5.6mm. The material of the friction extrusion head and pressure shoulder is In718, whose hardness value is much higher than that of 7B04 aluminum alloy. The friction extrusion head and pressure shoulder adopt an integrated design. The specific size parameters are as follows:

[0056] (1) Friction extrusion head: D4=6mm, single-sided extrusion interference is 0.2mm, H1=5mm, R=100mm, H2=10mm, side surface roughness Ra of friction extrusion head=0.2μm.

[0057] (2) Shoulder pressure: D1=24mm, D2=14mm, θ=11.31°, due to the integrated design, D3 is ignored.

[0058] (3) Backing plate: T=15mm, D5=8mm.

[0059] Figure 4 Shown is the manufactured one-piece friction extrusion head and pressure shoulder.

[0060] Use the above ...

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Abstract

The invention discloses a tool and a method for strengthening friction extrusion of structural member connecting holes, and belongs to the technical field of machining. The friction extrusion strengthening tool comprises three parts of a friction extrusion head, a necking, and a base plate. When the tool is used to strengthen a structural member connecting hole, under the condition of maintaining 0.02-1 mm extruding magnitude of interference between the friction extrusion head and the connecting hole, the friction extrusion head is rotated and is inserted into the connecting hole in uniform speed. After stopping rotation for 2-5 s, the friction extrusion head is pulled out. The rotation speed of the friction extrusion head is 100-1000 rpm, the insertion speed is 0.1-2 mm / s, and pulling-out speed is 0.3-2 mm / s. In the above process, residual compressive stress is formed near the wall surface of the hole, and plastic flow occurs to the material near the wall surface of the hole, and the material has lattice distortion, and dislocation density is increased, so as to realize friction extrusion strengthening on the connecting hole. The tool and the method are mainly used in strengthening of important structural member connecting holes in aviation, aerospace, trains, and ships, and other industries.

Description

technical field [0001] The invention belongs to the technical field of mechanical processing, and in particular relates to a friction extrusion strengthening tool and method for connecting holes of structural parts, which are mainly used for strengthening connecting holes of important structural parts in industries such as aviation, aerospace, trains and ships. Background technique [0002] In recent years, accidents of aircraft being damaged due to malfunctions have occurred frequently, seriously threatening people's lives. Among the various failures of aircraft, airframe damage has accounted for more than 30% of the total failures. Therefore, the total life of the aircraft is mainly determined by the life of the airframe. Fatigue damage is the root cause of the loss of working ability of the aircraft body, and 75-80% of the fatigue damage occurs in the connecting parts of the body structure. At present, the main connection method used in aircraft structural parts is stil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P9/02
Inventor 王敏朱智张会杰于涛张骁杨广新苏琳
Owner SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI
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