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A warm self-piercing riveting method and device for high-strength light-weight metal plates

A metal plate and self-piercing riveting technology, which is applied in the field of warm self-piercing riveting and high-strength light metal plate warm self-piercing riveting, which can solve the problem that the transformation of the microstructure of the material is too late to transform, the thermal insulation solution treatment is not performed, and the riveting area Poor material performance and other problems, to achieve the effect of good connection performance, reduce internal stress, and increase corrosion resistance

Active Publication Date: 2019-07-16
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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  • A warm self-piercing riveting method and device for high-strength light-weight metal plates
  • A warm self-piercing riveting method and device for high-strength light-weight metal plates
  • A warm self-piercing riveting method and device for high-strength light-weight 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 tests, the 7075 high-strength aluminum alloy plate is processed into a rectangular sample of 100mm×20mm, and the riveting area is a square of 20mm×20mm. Put the sample to be riveted into the resistance heating furnace 1, start timing when the temperature of the 7075 high-strength aluminum alloy plate rises to the solid solution temperature of 475°C, and keep it warm for 30 minutes to increase the solid solubility of the crystalline phase, so that the second phase MgZn 2 、Al 2 Mg 3 Zn 3 、Al 2 Particles such as CuMg 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 in real time by the infrared thermal imaging camer...

Embodiment 2

[0057] In this embodiment, the upper plate is made of 2 mm thick high-strength steel plate, and the lower plate is made of 2 mm thick 6061 aluminum alloy, wherein the center of the high-strength steel riveting area is pre-punched to ensure that the rivets pass through the upper plate and enter the lower plate in sequence.

[0058] Put the sample to be riveted into the resistance heating furnace 1, fully heat-preserve and solidify, wherein the heat-preservation temperature is 535°C, and the heat-retaining time is 30min, 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 in real time by the infrared thermal imaging camera 4, and the transfer process does not exceed 3s.

[0060] The infrared camera 4 monitors the surface temperature of t...

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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 deformation heat treatment connection of metal materials, and in particular relates to a method and device for warm self-piercing riveting of high-strength light metal sheets, especially suitable for high-strength light sheet metals with complex shapes (7xxx series aluminum alloys, magnesium alloys, etc.) Alloy and titanium alloy, etc.) and the warm self-piercing riveting method when connecting with heterogeneous plates (high-strength steel, carbon fiber plates). Background technique [0002] In recent years, energy saving and environmental protection have become concerns of the whole world. The light weight of the car body with the goal of improving the fuel economy and environmental protection of the car has become the general trend of the development of the automobile industry. The application of non-ferrous alloy plates such as high-strength aluminum alloys, magnesium alloys, and titanium alloys has ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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