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Two-stage mechanical-solid phase composite connection method based on semi-tubular rivets

A technology of solid-phase composite and connection method, which is applied in the field of material connection, can solve problems such as joint strength loss, achieve the effect of increasing temperature, improving overall strength and stiffness, and improving riveting force

Active Publication Date: 2020-06-09
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For light alloys that can be strengthened by heat treatment, such as 2-series, 6-series, and 7-series aluminum alloys, affected by frictional heat softening, the strength of the joint is seriously lost

Method used

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  • Two-stage mechanical-solid phase composite connection method based on semi-tubular rivets
  • Two-stage mechanical-solid phase composite connection method based on semi-tubular rivets
  • Two-stage mechanical-solid phase composite connection method based on semi-tubular rivets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Such as figure 2 As shown, it is the specific implementation environment of this embodiment, including: a semi-tubular rivet 1, a driving head 2 and a fixing mold 3, wherein: the driving head 2 matches the groove 101 on the top of the semi-tubular rivet 1 through the boss and is located together Above the workpieces 4 to be connected, the fixing mold 3 is located below the workpieces 4 to be connected.

[0036] Such as figure 1 As shown, the semi-tubular rivet 1 used in this embodiment includes: a rivet cover 102 and a rivet body 103 integrally connected, wherein: the groove 101 in the center of the rivet cover 102 is arranged coaxially with the rivet body 103 .

[0037] The inner and outer walls of the rivet body 103 are smooth, with an inner diameter of 4.3 mm, an outer diameter of 5.3 mm, and a depth of 4 mm.

[0038] The bottom end of the rivet body 103 is provided with a wedge-shaped taper angle 104 with an angle of 45°.

[0039] The boss of the driving head 2 ...

Embodiment 2

[0054] Compared with Example 1, the thickness of the upper plate 401 of the workpiece 4 to be connected in this embodiment is 2.2 mm, and the material is aluminum alloy AA6061-T6, and the thickness of the lower plate 402 is 2.0 mm, and the material is magnesium alloy AZ31B.

[0055] Compared with Example 1, the rivet speed in the first stage of the process used in this example is 3600r / min, the feed rate is 1.0mm / s, and the feed rate in the second stage is 11mm / s.

[0056] Compared with Example 1, the conversion depth D of the first stage in this example is determined by measuring the temperature of the upper surface of the upper plate 401 at a distance of 4.0mm from the edge of the rivet with an infrared thermal imager. When the temperature at this point is greater than 125°C and the feed When the depth is 2.2mm greater than the thickness of the upper layer, the process enters the second stage.

[0057] Other parameters in this embodiment are the same as in Embodiment 1.

[...

Embodiment 3

[0061] Compared with Embodiment 1, the upper plate 401 of the workpiece 4 to be connected in this embodiment is aluminum alloy AA5182-O with a thickness of 1.5 mm, and the lower plate 402 is aluminum alloy AA5182-O with a thickness of 2.0 mm.

[0062] Compared with Example 1, in the first stage of the process adopted in this example, the rivet speed is 3000r / min, the feed rate is 2.0mm / s, and the feed rate in the second stage is 10mm / s.

[0063] Compared with Embodiment 1, the conversion depth D in this embodiment is set to 2.0 mm based on experience.

[0064] Other parameters in this embodiment are the same as in Embodiment 1.

[0065] Compared with the prior art, the maximum riveting force in this embodiment is 19.9kN during the fastening process of the aluminum alloy AA5182-O with a thickness of 1.5mm and the aluminum alloy AA5182-O with a thickness of 2.0mm. The riveting force of the riveting method is reduced by 50.5% compared with 40.2kN.

[0066] The average tensile-s...

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Abstract

A two-stage mechanical-solid-phase composite connection method based on a semi-hollow rivet. By setting the semi-hollow rivet coaxially with the drive head of the fixed mold and engaging the groove on the rivet cover with the boss of the drive head, the drive is set. The head drive drives the rivet into the material to be joined by high-speed rotation and low-speed feed in the first stage of the process; in the second stage, the rivet stops rotating and feeds at a higher speed to avoid excessive accumulation of heat near the rivet. The riveting force makes the bottom of the rivet expand outward under the action of the deformation resistance of the materials to be connected, forming a mechanical interlock. The interface gap is eliminated, and the interface forms a solid-phase connection through thermal diffusion at high temperature. The invention can significantly improve the interference interlocking effect of the mechanical connection, and form a solid-phase connection between the rivet and the workpiece, and between the workpiece and the workpiece, and obtain mechanical-solid Composite joints.

Description

technical field [0001] The invention relates to a technology in the field of material connection, in particular to a two-stage mechanical-solid phase composite connection method based on a semi-hollow rivet. Background technique [0002] The point connections of light alloy components are mainly riveting and friction stir spot welding. The riveting process uses punching to make the rivet and / or the workpiece to be connected plastically deform to form an interference interlock and realize a mechanical connection. The riveting process is usually carried out at room temperature. In order to obtain the ideal interference interlocking effect, a large punching force needs to be applied. The structural strength and rigidity of the riveting equipment, the reliability of the punching drive mechanism, and the strength of the rivet itself are extremely demanding and the punch And mold loss is serious. In addition, for light alloys with low ductility at room temperature, such as 7-ser...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21J15/02B21J15/04B21J15/12B21J15/28
CPCB21J15/027B21J15/025
Inventor 马运五李永兵山河杨炳鑫
Owner SHANGHAI JIAOTONG UNIV