锻压技术

沉台工艺对自冲铆接接头的力学性能的影响

英文标题：Effects of sinking process on mechanical properties of self-piercing riveted joints

作者：易超1 于万元2 王超3 陈涛1 3

单位：1. 湖南湖大艾盛汽车技术开发有限公司整车性能集成部 2. 柳州职业技术大学汽车工程学院 3.湖南大学整车先进设计制造技术全国重点实验室

分类号：TG938

出版年,卷(期):页码：2025,50(7):165-172

摘要：

为了研究不同沉台工艺对自冲铆接接头的成形质量、力学性能和失效机理的影响，针对3.0 mm厚度的6063-T6铝合金板材设计了两种沉台特征和3种沉台厚度。铝合金作为上层板与1.2 mm厚度的DP590高强度钢板完成连接，并进行了剖面检查、力学测试和微观组织分析。结果表明，3种沉台厚度的接头均满足下层板为钢板时，底切值和底部厚度大于0.1 mm的要求。U型接头的特征设计增加了铝板的刚度，相比P型接头在相同载荷下的变形更小。在剪切拉伸试验中，6种接头均表现出互锁失效。随着上层板厚度的增加，失效后的铆钉的倾斜程度逐渐减小。相同沉台厚度下，U型接头的峰值力和能量吸收比P型接头至少高1.4%和6.2%。随着沉台厚度增加，U型接头和P型接头的峰值力和能量吸收的增加幅度分别超过22.4%和47.4%。

In order to investigate the influences of different sinking processes on the forming quality, mechanical properties and failure mechanism of self-pierce riveted joints, two sinker features and three sinker thicknesses were designed for 6063-T6 aluminum alloy sheet with the thickness of 3.0 mm. Then, aluminum alloy was used as the upper plate to complete the connection with the DP590 high-strength steel sheet with the thickness of 1.2 mm, and cross-section inspection, mechanical testing and microscopic analysis were conducted. The results show that the joints with three different sinking thicknesses all meet the requirement of undercut value and bottom thickness greater than 0.1 mm when the steel sheet is set as the lower layer. The U-type joint enhances the stiffness of the aluminum sheet, resulting in less deformation compared to the P-type joint under the same loading. In shear-tensile tests, six joints all exhibit interlock failure. As the upper sheet thickness increases, the inclination of the failed rivets gradually decreases. Under the same sinking thickness, the peak load and energy absorption of the U-type joint are at least 1.4% and 6.2% higher than those of the P-type joint, respectively. With the increasing of sinking thickness, the increase in peak load and energy absorption for the U-type and P-type joints exceeds 22.4% and 47.4%, respectively.

基金项目：

微小型纯包架构安全与节能关键技术研究(桂科AA23062064)；2024年度广西高校中青年教师科研基础能力提升项目(2024KY1097)

作者简介：易超(1987-)，男，硕士，工程师 E-mail：yichao0926@163.com 通信作者：于万元(1987-)，女，硕士，工程师 E-mail：ywy196364@126.com

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