Friction extrusion strengthening method of structural member connecting hole

A technology for connecting holes and structural parts, applied in the field of machining, can solve the problems of high cost of laser shock strengthening technology, unsatisfactory strengthening effect, narrow application range, etc., to eliminate wall scratches, enhance the ability of initiation and expansion, improve The effect of wall quality

Inactive Publication Date: 2016-08-17
SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI
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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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  • Friction extrusion strengthening method of structural member connecting hole
  • Friction extrusion strengthening method of structural member connecting hole
  • Friction extrusion strengthening method of structural member connecting hole

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Embodiment 1

[0037] In this embodiment, the connection hole on the aluminum alloy structure is strengthened by friction extrusion, wherein the mother plate is a 2mm thick 7B04 aluminum alloy sheet, and the diameter of the connection hole before strengthening is 5.6mm. The material of the friction extrusion head is In718 alloy, whose hardness value is much higher than that of 7B04 aluminum alloy. The diameter of the cylindrical section of the friction extrusion head is 6mm, the length of the cylindrical section is 5mm, and the surface roughness Ra value of the friction extrusion head is 0.2μm , The single-sided extrusion interference is 0.2mm. The specific strengthening process is as follows:

[0038] Step 1: Positioning and centering. Align the friction extrusion head with the connection hole to ensure that the axis of the friction extrusion head coincides with the axis of the connection hole.

[0039] Step 2: Rotate and insert. The friction extrusion head is rotated at a speed of 100 r...

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Abstract

The invention discloses a friction extrusion strengthening method of a structural member connecting hole, and belongs to the technical field of machining. The method comprises: using a friction extrusion head as a friction extrusion strengthening tool, under the condition of maintaining 0.02-1 mm extruding magnitude of interference between the friction extrusion head and a connecting hole, rotating the friction extrusion head and inserting into the connecting hole on a structural member in uniform speed, and stopping rotation for 2-5 s, and then pulling the friction extrusion head out; the rotation speed of the friction extrusion head being 100-1000 rpm, insertion speed being 0.1-2 mm / s, and pulling-out speed being 0.3-2 mm / s. In the above process, residual compressive stress is formed on neighborhood of 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 structural member connecting hole. The method is 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 method for connecting holes of structural parts, which is 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 still mechanic...

Claims

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Application Information

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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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