基于镦头不均匀变形的压铆力建模
收稿日期: 2015-12-14
修回日期: 2016-02-17
网络出版日期: 2016-03-02
基金资助
国家自然科学基金（51375396)；中航工业产学研项目（cxy2014XGD07)
Riveting force computation model based on formed head inhomogeneous deformation
Received date: 2015-12-14
Revised date: 2016-02-17
Online published: 2016-03-02
Supported by
National Natural Science Foundation of China (51375396); AVIC Production-Study-Research Cooperative Innovation Project (cxy2014XGD07)
压铆力是影响铆接质量的重要参数，其数值的确定主要依赖于经验或简化的理论模型，且不考虑镦头鼓形部分的影响，因而误差较大。依据铆钉材料在压铆过程中的流动趋势，将压铆过程划分为4个阶段，并确定了最大压铆力出现的位置。基于厚壁筒受压进入塑性状态的极限应力分析，建立了镦头不均匀变形的压铆力计算模型，结合体积不变假设得到了镦头圆环部分尺寸，用于压铆力的求解。最后以直径4 mm和5 mm的平锥头铆钉压铆为例，利用ABAQUS软件和G86型钻铆机分别进行数值模拟与压铆实验，对相同压铆力作用下的镦头尺寸进行对比。结果表明，模拟和实验得到的镦头尺寸与理论相比，差别均小于5%，表明该压铆力计算模型具有有效性。
常正平 , 王仲奇 , 王斌斌 , 康永刚 , 罗群 . 基于镦头不均匀变形的压铆力建模[J]. 航空学报, 2016 , 37(7) : 2312 -2320 . DOI: 10.7527/S1000-6893.2016.0043
The riveting force is one of the important parameters to guarantee riveting quality. However, traditional approaches are concentrated on experience or simplified theoretical model and do not consider the impact of formed head inhomogeneous deformation, which brings errors. This paper presents a riveting force computation model to improve the effectiveness where the formed head inhomogeneous deformation is taken into consideration. In this paper, the riveting process is divided into four stages according to the rivet material flow trends, and the maximum riveting force position can be determined. Based on the ultimate stress analysis of thick-walled cylinder compressed into plastic state, the computational model of riveting force is built in the inhomogeneous deformation situation. The model parameter is solved combining with the volume invariant assumption. Finally, 4 mm and 5 mm diameter protruding head rivets are selected to conduct the research. Under the same riveting force, the ABAQUS and G86 drilling and riveting machine are used to finish numerical simulation and riveting experiment respectively. The results show that the difference is less than 5%, comparing the ideal dimension with numerical simulation and experiment. Therefore, the computation model of riveting force has its effectiveness.
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