铆接力对铝/钢自冲铆接头几何特性的影响

Effect of riveting force on the geometric characteristics of self-piercing riveting joint of aluminum/steel

以铝合金为穿孔板、以低碳钢为锁紧板,对其进行了自冲铆连接。观察、分析了接头横断面几何特性随铆接力的变化。随着铆接力的增大,铝合金与钢自冲铆接头的喇叭口直径、铆钉腿展开度、切入量均呈增大趋势,而下板凸起高度、底角余量则呈下降趋势。在16~24 kN铆接力范围内,铝合金与钢自冲铆接头的底部厚度变化较小,当铆接力大于24 kN,底部厚度随铆接力的增大突然下降。结果表明:铝合金与钢自冲铆接头的抗剪载荷随着铆接力的增大呈先增大后下降的变化趋势,铆接力为24 kN时接头抗剪载荷达到最大,约为5.88 kN。

Aluminum alloy and low carbon steel plates are joined by self-piercing riveting,in which aluminum alloy plate is used as upper plate and low carbon steel plate is used as lower plate,respectively.The variation of the geometric characteristics of joint cross section with riveting force is observed and analyzed.When the riveting force increases,the bell-mouth diameter,rivet leg expansion and amount of undercut of the joint increase,while the lower plate raised height and bottom angle margin of the joint reduce.In the range of 16~24 kN riveting force,the bottom thickness of the joint varies slightly;when the riveting force is over 24 kN,the bottom thickness suddenly reduces as the riveting force increases.The results show that the shear load of the joint increases first and then decreases as the riveting force increases,and the maximum shear load reaches about 5.88 kN when the riveting force is 24 kN.