To predict the curing degree of adhesive bonded automobile aluminum joint, the heat transferring process of the joint within the curing process was experimentally analyzed; Based on the experimental results, the inner heat released by adhesive is neglected; the temperature distribution of the joint is considered to be uniform. According to the joint energy balance, the temperature variation of the joint has been studied, following which the analytic curing degree prediction model of joint is established, and then verified through experiments. Finally, the effects of curing parameters and substrate thickness on the curing degree were discussed. It has been found that increasing cuing temperature can significantly improve the curing rate of the joint while increasing the preheat temperature or decreasing the adherend thickness can not improve the curing rate of the joint, but make the curing of adhesive start earlier. It has also been found that the effect of preheat temperature can be more pronounced at a great adherend thickness.%为了预测铝合金胶接接头固化过程中固化度的变化规律.通过实验对5A02铝合金胶接接头固化过程中的传热特征进行分析,在忽略胶层所释放的内热的前提下,将胶接接头简化为一集总热源系统.根据热传导理论,获得了胶接接头固化过程中温度变化的解析预测公式,并结合胶黏剂的固化动力学方程,得到了胶接接头固化过程中固化度的预测方法.通过实验对接头固化度的计算结果进行了验证,证明固化度解析预测方法的合理性.讨论了接头固化工艺参数及几何参数对固化度的影响规律,发现增加固化温度会明显提高接头的固化速率;增加预热温度或减小铝合金板不能提高接头的固化速率,但会导致接头固化提前开始;当铝合金板厚较大时,增加预热温度对促进胶黏剂固化的影响会更加明显;因此,对于车身结构中铝板较厚的部位,采用增加预热温度的方法能够较好的提高铝板胶接结构的固化度.
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