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Warm self-piercing riveting method and device for high-strength light metal plates

A metal plate, self-piercing riveting technology, applied in the field of warm self-piercing riveting, high-strength light metal plate warm self-piercing riveting, can solve the problem of material microstructure transformation that is too late to transform, heat preservation and solution treatment, and riveting areas Poor material performance and other problems, to achieve the effect of good connection performance, reduce internal stress, and increase corrosion resistance

Active Publication Date: 2018-08-21
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some common problems in the above methods. For example, the processing of the device is difficult, it is not easy to maintain, and the cost is high. Although local heating can improve the formability of the material, it does not carry out heat preservation and solid solution treatment, and the transformation of the microstructure of the material is too late. Local internal stress, and inconsistent material properties, poor material properties in the riveted area

Method used

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  • Warm self-piercing riveting method and device for high-strength light metal plates
  • Warm self-piercing riveting method and device for high-strength light metal plates
  • Warm self-piercing riveting method and device for high-strength light metal plates

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Experimental program
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Effect test

Embodiment 1

[0050] Such as Figure 4 As shown, the upper plate and the lower plate are both 2mm thick 7075 high-strength aluminum alloy. In order to facilitate subsequent performance testing, the 7075 high-strength aluminum alloy plate is processed into a 100mm×20mm rectangular sample, where the riveting area is 20mm×20mm square. Put the sample to be riveted into the resistance heating furnace 1. When the 7075 high-strength aluminum alloy plate is heated to the solid solution temperature of 475 ℃, start timing and keep it for 30 minutes to increase the solid solubility of the crystalline phase and make the second phase MgZn 2 , Al 2 Mg 3 Zn 3 , Al 2 CuMg and other particles are fully dissolved into the aluminum matrix.

[0051] After the solid solution is completed, it is transferred by the transfer mechanism 2 to the mold of the self-piercing riveting machine 3, and the temperature change of the plate is monitored by the infrared thermal imager 4 in real time, and the transfer process does no...

Embodiment 2

[0057] In this embodiment, the upper plate uses a 2mm thick high-strength steel plate, and the lower plate uses a 2mm thick 6061 aluminum alloy. The center of the high-strength steel riveting area is pre-punched to ensure that the rivet passes through the upper plate and enters the lower plate.

[0058] Put the sample to be riveted into the resistance heating furnace 1 to fully heat and hold the solid solution, where the heat retention temperature is 535°C, and the heat retention time is 30 min, so that the solute atoms are fully dissolved into the matrix to obtain a saturated solid solution.

[0059] After the solid solution is completed, it is transferred by the transfer mechanism 2 to the mold of the self-piercing riveting machine 3, and the temperature change of the plate is monitored by the infrared thermal imager 4 in real time, and the transfer process does not exceed 3s.

[0060] The infrared thermal imager 4 monitors the surface temperature of the sheet until it reaches the s...

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Abstract

The invention provides a warm self-piercing riveting method for high-strength light metal plates. The warm self-piercing riveting method for high-strength light metal plates comprises treatment stepsof rapid heating on high-strength light alloy, heat-insulation solution treatment, transferring and air cooling, side pressing, riveting and forming, pressure maintaining and quenching and artificialageing. By heating on the high-strength light metal plates to a certain temperature, the strength and hardness of the high-strength light metal plates are reduced, the plasticity and toughness are improved, and therefore, performance of a riveting process is improved. The invention further discloses a device used in the self-piercing riveting method. The invention aims to implement the novel self-piercing riveting method for the same or dissimilar materials of the high-strength light metal plates such as aluminum alloy, magnesium alloy and titanium alloy, the self-piercing riveting quality ofalloy plates is ensured, the problem of poor self-piercing riveting forming performance of the high-strength light metal plates is solved, furthermore, the production efficiency is improved, and extensive use of a warm self-piercing riveting technology for high-strength light metal plates in various industrial production fields will be facilitated.

Description

Technical field [0001] The invention belongs to the technical field of metal material deformation heat treatment connection, and in particular relates to a high-strength lightweight metal sheet warm self-piercing riveting method and device, and is particularly suitable for high-strength lightweight sheet metals with complex shapes (7xxx series aluminum alloys, magnesium Alloy and titanium alloy, etc.) and the warm self-piercing riveting method when connecting with heterogeneous plates (high-strength steel, carbon fiber board). Background technique [0002] In recent years, energy conservation and environmental protection have become issues of concern to the world. The lightweight of the car body with the goal of improving the fuel economy and environmental protection of automobiles has become the general trend of the development of the automobile industry. The application of high-strength aluminum alloys, magnesium alloys, titanium alloys and other non-ferrous alloy sheets has b...

Claims

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Application Information

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IPC IPC(8): B21J15/02B21J15/38C22F1/04C22F1/18C22F1/06
CPCB21J15/025B21J15/38C22F1/002C22F1/04C22F1/06C22F1/183B21J15/08
Inventor 盈亮代景超韩啸胡平韩小强
Owner DALIAN UNIV OF TECH