穿透式自冲铆接接头成形工艺及力学性能

Forming process and mechanical properties of self-piercing-through riveting joint

为探究穿透式自冲铆接工艺,建立了穿透式自冲铆接过程的有限元仿真模型,并开展了工艺试验研究,探究了铆钉长度和底板厚度对铝合金/聚碳酸酯异质穿透式自冲铆接接头力学性能的影响,分析了PC板的预热温度对铆接成形裂纹产生的影响。结果表明,穿透式自冲铆接工艺过程可分为压紧、刺穿上板、刺穿下板和成形4个阶段;穿透式自冲铆接接头的失效载荷和能量吸收值均随着铆钉长度和底板厚度的增加而增加;热处理不仅可以抑制裂纹的产生,还可以提高接头的力学性能,预热处理后接头的最大失效载荷相较于常温处理的试样提升了26.21%。

To study the self-piercing-through riveting technology,the finite element simulation model of self-piercing-through riveting process was developed and the process experiments were carried out to explore the effect of rivet length and bottom plate thickness on mechanical performance of aluminum/polycarbonate self-piercing-through riveting joint.The effect of preheating temperature of PC plate on the crack of riveting forming was analyzed.The results show that the process of self-piercing-through technology can be divided into four stages:pressing,piercing the upper plate,piercing the lower plate and forming.Both the failure load and energy absorption of the self-piercing-through riveting joint increase with the increase of the rivet length and the bottom plate thickness.Thermal treatment not only constrains crack generation but also improves the mechanical properties of the joint.The maximum failure load of the joint after preheating treatment is increased by 26.21% compared with that of the specimen after normal temperature treatment.