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Method for determining riveting temperature and riveting speed of self-piercing riveting of low-ductility material

A technology for self-piercing riveting and ductile materials, which is applied in the field of riveting speed and determination of riveting temperature for self-piercing riveting of low-ductility materials, and can solve problems such as low deformation capacity, poor plasticity, and difficult self-piercing riveting

Inactive Publication Date: 2012-05-23
ZHENGZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, almost all self-piercing riveting has focused on the riveting of high ductility materials such as steel plates, deformed aluminum alloy plates, etc., and rarely involves the connection of low ductility materials.
Magnesium alloy has only three slip systems, poor plasticity, low deformation ability, poor plasticity at room temperature, not suitable for large deformation forming, and difficult for self-piercing riveting

Method used

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  • Method for determining riveting temperature and riveting speed of self-piercing riveting of low-ductility material
  • Method for determining riveting temperature and riveting speed of self-piercing riveting of low-ductility material
  • Method for determining riveting temperature and riveting speed of self-piercing riveting of low-ductility material

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Experimental program
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Embodiment 1

[0055] Use AZ31 magnesium alloy plate with 2mm thickness, use JA003000 self-piercing riveting machine produced by British Henrob Company for riveting, use flat head semi-hollow rivets with diameter of 5mm and length of 6mm for riveting, the riveting force of the equipment is about 30kN, and the riveting speed is ≤200mm / sec. For sample shapes and dimensions see figure 1 .

[0056] According to the method steps of the present invention, the sample adopts a plate sample with a size of 5 times the gauge length of 60 × 12mm, and is divided into several equal divisions with a distance of 5 mm in the range of the gauge length of the sample before the test, and the gauge mark and the division gauge length Do not engrave on the corners of the specimen. According to the riveting speed range of the self-piercing riveting machine 0-200mm / Sec, the strain rate range of the material is determined to be 0.00128-5s -1 . Tensile tests were carried out at room temperature, 100°C, 150°C, 200°C...

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Abstract

The invention relates to a method for determining riveting temperature and riveting speed of self-piercing riveting of a low-ductility material. The method quickly determines riveting temperature and riveting speed of the material by the steps of determining elongation and strength change curve of the material and the like so as to ensure that the material obtains a high-strength self-piercing riveting joint, reduce exploration and practice of self-piercing riveting technology of the material and reduce cost of alloy riveting. The method is the novel, simple and convenient method for determining riveting preheating temperature and riveting speed of self-piercing riveting of the low-ductility material.

Description

(1) Technical field [0001] The invention belongs to the connection field of metal materials, in particular to a method for determining the riveting temperature and riveting speed of low ductility material self-piercing riveting. (2) Background technology [0002] Magnesium and its alloys and other low-ductility materials can be widely used in automobiles, communications, electronic appliances, aerospace , national defense and military equipment, transportation, metallurgy, chemical industry and other industries. However, due to the shortcomings of magnesium alloys such as low melting point, high linear expansion coefficient and thermal conductivity, and strong affinity with oxygen and nitrogen, it will cause a series of difficulties in the process of welding, riveting, screwing and other mechanical connections. The use of magnesium alloys in structural parts. In recent years, scholars at home and abroad have conducted many researches on magnesium alloy welding and proposed...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21J15/28B29C65/60
CPCB29C66/1122B29C65/602B29C65/603B29C66/8322B29C66/43
Inventor 刘忠侠王培中王军伟王明星
Owner ZHENGZHOU UNIV