低温环境下超声自冲铆接头力学性能  

The mechanical properties of ultrasonic self-piercing riveting joints under low temperature environment

作　　者：许龙 李承旺 赵伦 叶凯 洪宛璐 雷乐 严卓晟 XU Long;LI Chengwang;ZHAO Lun;YE Kai;HONG Wanlu;LEI Le;YAN Zhuocheng(College of Science China Jiliang University,Hangzhou 310018,China;Institute of Ultrasonic Technology,Shenzhen Polytechnic University,Shenzhen 518055,China;Faculty of Intelligent Manufacturing Engineering,Guizhou Industry Polytechnic College,Guiyang 551400,China;Guangzhou XinDongLi UItrasonic Electronic Equipment Co.,Ltd,Guangzhou 510507,China)

机构地区：[1]中国计量大学理学院,杭州310018 [2]深圳职业技术大学超声技术研究所,深圳518055 [3]贵州工业职业技术学院智能制造工程系,贵阳551400 [4]广州市新栋力超声电子设备有限公司,广州510507

出　　处：《应用声学》2024年第6期1334-1340,共7页Journal of Applied Acoustics

基　　金：国家自然科学基金项目(12104324);高层次人才科研启动项目(6022310046k);深职院新栋力超声波焊接技术研发中心项目(602331009PQ);深圳职业技术学院博士后启动基金项目(6022331003K);深圳市优秀科技创新人才培养项目(RCBS20210706092213010);广东省普通高校特色创新项目(504-6020210006T)。

摘　　要：作为一种新型的机械连接技术,自冲铆接技术已广泛应用于车身制造中。该文选用5A06铝合金作为试验板材,使用自冲铆接工艺与超声焊接工艺制备自冲铆接头与超声自冲铆接头,通过常温拉伸与低温拉伸方法探究超声振动对自冲铆接头力学性能的影响。结果表明:超声金属焊接能够有效地提升自冲铆接头在常温与低温环境下的力学性能;低温下超声自冲铆接头脆性增加,一定程度上降低了接头的稳定性,出现了多种失效形式;低温下自冲铆接头与超声自冲铆接头断口呈脆性断裂形貌;在超声自冲铆接头内部观察到超声固相焊痕,接头内部出现了冶金连接。以上结果说明超声金属焊接有效提升了自冲铆接头的抗低温性能。As a new type of mechanical connection technology,self-piercing riveting technology has been widely used in body manufacturing.In this paper,5A06 aluminum alloy was selected as the test plate,self-piercing riveting joints and ultrasonic self-piercing riveting joints were prepared by self-piercing riveting process and ultrasonic welding process,and the influence of ultrasonic vibration on the mechanical properties of self-piercing riveting joints was explored by normal temperature stretching and low temperature stretching methods.The results show that ultrasonic metal welding can effectively improve the mechanical properties of self-piercing riveting joints in room temperature and low temperature environments.The brittleness of ultra-sonic self-piercing riveting joints increases at low temperatures,which reduces the stability of the joints to a certain extent,and a variety of failure forms appear.The fractures of self-piercing riveting joints and ultrasonic self-piercing riveting joints at low temperature showed brittle fracture morphology.Ultrasonic solid-phase weld marks were observed inside the ultrasonic self-piercing rivet joint,and metallurgical connections appeared inside the joint.The above results show that ultrasonic metal welding can effectively improve the low temperature resistance of self-piercing riveting joints.

关 键 词：低温环境 超声焊接 自冲铆接 力学行为 断口分析 

分 类 号：TB559[理学—物理]