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采用摩擦加热的方法对2 mmAZ31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。
Friction heating method 2 mmAZ31 magnesium alloy sheet is heated, and then its self-piercing riveting. The temperature variation of sheet, the surface damage of sheet, the self-piercing riveting effect and the shearing and fatigue properties of the riveted joint were studied. The results show that the frictional heating can rapidly increase the temperature of the sheet to the temperature required for the self-piercing riveting. The heating process will cause some damage to the sheet surface, but the degree of damage is slight; the magnesium alloy sheet is frictionally heated above 180 ° C. Riveting can effectively prevent sheet cracking, eliminate cracks and increase the amount of interlocking between the rivet and the plate, thus obtaining a self-piercing riveted joint with excellent shear and fatigue properties. Compared with self-piercing riveting joints of the same type of magnesium alloy plate heated by electric heating plate, the shear strength and fatigue performance of the self-piercing riveting joint increased with friction heating, which indicated that slight damage caused by friction heating on the surface of the plate Mechanical properties have almost no effect.