摩擦加热AZ31镁合金板材的自冲铆接
Self-piercing Riveting of Friction-heated AZ31 Alloy Sheet
杜 越， 王明星， 刘忠侠， 韩高锟， 杨连捷， 刘志勇
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作者单位：(郑州大学 材料物理教育部重点实验室， 河南 郑州 450052)
中文关键字：AZ31镁合金板材； 摩擦加热； 自冲铆接； 剪切强度； 疲劳性能
英文关键字：AZ31 magnesium alloy sheet; friction-heating; self-piercing riveting (SPR); shear strength; fatigue property
中文摘要： 采用摩擦加热的方法对2 mm AZ31镁合金板材进行加热，然后对其进行自冲铆接。对摩擦加热过程中板材的温度变化、 板材的表面损伤、 自冲铆接效果以及铆接接头的剪切和疲劳性能进行了研究。 结果表明，摩擦加热可以将板材的温度迅速提高到自冲铆接所需要的温度， 加热过程会对板材表面造成一定损伤，但损伤程度轻微；将镁合金板材摩擦加热至180 ℃以上再进行自冲铆接可以有效避免板材的开裂，消除裂纹，增加铆钉与板材之间的互锁量，因而可获得具有优良剪切及疲劳性能的自冲铆接接头。与电热板加热同类型镁合金板材的自冲铆接接头相比，摩擦加热自冲铆接接头的剪切强度及疲劳性能均有所增加，这表明摩擦加热对板材表面造成的轻微损伤对铆接接头的力学性能几乎没有影响。
英文摘要：The self-piercing riveting (SPR) of the 2 mm AZ31 alloy sheet was preheated using friction-heating method. The temperature variation and surface damage of the sheet during the fiction-heating, the riveting effect, the shear and fatigue properties of the SPR joints were investigated. The results show that the friction-heating can rapidly increase the temperature of the sheet up to the temperature required for SPR, and the surface of the sheets was slightly damaged. When the SPR was done for the magnesium alloy sheet fiction-heated up to 180℃ and above, the cracking of the riveted sheets can effectively avoided. The fiction-heating yet can increase the interlock volume between the rivets and the riveted sheets. In short, the magnesium alloy SPR joints with excellent shear and fatigue properties can be produced by the fiction-heating. Compared with the SPR joints of the magnesium alloy sheet preheated using the electric-heating plate, the shear and fatigue properties of the SPR joints of the friction-heated magnesium alloy sheet are higher. The slight surface damage caused by the fiction-heating had little effect on the mechanical properties of the SPR joints of the magnesium alloy sheet.