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Open pore structure orifice cold extrusion fatigue strengthening device and method

A technology of opening structure and strengthening device, which is applied in the field of aerospace manufacturing, can solve the problems of inability to strengthen the orifice, and achieve the effect of avoiding uneven stress distribution, improving fatigue life and maintaining uniform strengthening

Active Publication Date: 2021-06-18
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention intends to provide a cold-extrusion fatigue strengthening device for an opening structure orifice, which solves the problem that the existing equipment or process cannot realize fatigue strengthening for the orifice

Method used

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  • Open pore structure orifice cold extrusion fatigue strengthening device and method
  • Open pore structure orifice cold extrusion fatigue strengthening device and method
  • Open pore structure orifice cold extrusion fatigue strengthening device and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] as attached figure 1 And attached figure 2 Shown: a cold extrusion fatigue strengthening device with an open hole structure, including an extruder, a strengthening head and an opening structure. The strengthening head includes a connecting rod, a connecting column and a strengthening head. The connecting rod is a slender cylinder connected There is an external thread on the top of the rod, and the extruder adopts an electromagnetic force loading device, a riveting machine, a pneumatic riveting gun or a press, and an internal thread is provided on the extruder, and the extruder is threadedly connected with the connecting rod. The connecting column is cylindrical, the center of the upper surface of the connecting column is coaxially connected with the bottom of the connecting column, the reinforced head is coaxially connected to the center of the lower surface of the connecting column, and the reinforced head is a rotating body with the central axis of the middle cylinde...

Embodiment 2

[0043] as attached image 3 As shown, the difference between this embodiment and Embodiment 1 is only that: in this embodiment, the outer surface shape of the strengthening head is a conical surface, which is suitable for fatigue strengthening of a large-diameter hole structure orifice, and the cone angle is 30°-150° ( image 3 From left to right in the middle are 30°, 60° and 150° cone angles), by selecting different cone angles, the control of the degree of strengthening in different directions of the orifice is realized, and the degree of strengthening of the orifice along the axial direction of the hole increases with the cone angle The strengthening degree of the orifice along the aperture direction decreases with the increase of the cone angle.

Embodiment 3

[0045] as attached Figure 4 As shown, the difference between this embodiment and Embodiment 1 is only that: in this embodiment, the outer surface shape of the reinforced head includes a generatrix satisfying the surface of revolution in the interval of x=0 to x=R in the hyperbola, parabola and elliptic equation, Among them, R is the radius of the connecting column, which is suitable for fatigue strengthening of large-diameter and medium-depth hole structure orifices.

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Abstract

The invention discloses an open pore structure orifice cold extrusion fatigue strengthening device and method, and particularly relates to the field of aerospace manufacturing. The open pore structure orifice cold extrusion fatigue strengthening device comprises an extruder, a strengthening head and an open pore structure, wherein a connecting rod is in threaded connection with the extruder, the strengthening head is a rotary body with the central axis of a middle cylinder as a rotary shaft, and a locating column is arranged on the strengthening head. The strengthening method comprises the following steps that the strengthening head is selected and is in threaded connection with the extruder; the open pore structure is fixed, then the locating column of the strengthening head is inserted into an orifice from the open pore structure to be located, and the strengthening head is in contact with the orifice; the extruder is utilized to apply pressure, so that the strengthening head extrudes the orifice of the open pore structure; and extrusion is stopped after the strengthening head extrudes the orifice of the open pore structure to the extrusion amount. By the adoption of the technical scheme, the problem that fatigue strengthening cannot be conducted on the orifice through existing equipment or process is solved, and the anti-fatigue performance of the orifice of the open pore structure can be improved.

Description

technical field [0001] The invention relates to the field of aerospace manufacturing, in particular to a cold-extrusion fatigue strengthening device and a strengthening method for orifices with open holes. Background technique [0002] With the rapid development of the aviation industry, civil aircraft and military aircraft in all countries in the world are gradually being updated, and the requirements for increasing the service life of aircraft are also increasing. The service life of the overall structure of the aircraft is mainly determined by the fatigue resistance of the constituent structures. At present, screwing and riveting are the most important connection methods for aircraft structural parts, and bolt holes and riveting holes are likely to cause stress concentration, making the connection structure the main source of fatigue failure of the overall structure, which makes the maintenance cost of the aircraft extremely high, even cause aviation accidents. In the d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D7/04C22F1/00
CPCC21D7/04C22F1/00
Inventor 左杨杰李嘉安陈俊锜杨洲邓金风
Owner SICHUAN UNIV