DP590钢和AA6061铝合金自冲铆接接头的成形质量及静力学性能  

Forming quality and static mechanical properties for self-piercing riveted joints of DP590 steel and AA6061 aluminum alloy

作　　者：贾颖莲[1,2] 何世松 李晓炀[1] Jia Yinglian;He Shisong;Li Xiaoyang(School of Mechanical and Electrical Engineering,Jiangxi V&T College of Communications,Nanchang 330013,China;Key Laboratory for Conveyance and Equipment,Ministry of Education,East China Jiaotong University,Nanchang 330013,China)

机构地区：[1]江西交通职业技术学院机电工程学院,江西南昌330013 [2]华东交通大学载运工具与装备教育部重点实验室,江西南昌330013

出　　处：《锻压技术》2023年第9期119-129,共11页Forging & Stamping Technology

基　　金：江西省教育厅科学技术研究项目(GJJ2205206,GJJ214612)。

摘　　要：为了探究DP590钢和AA6061铝合金自冲铆接接头的成形质量和静力学性能,采用有限元软件Simufact Forming和利用自冲铆接设备分别进行了自冲铆接成形的模拟和试验验证,并对接头进行了静拉伸测试。结果表明:当连接板叠放顺序相同时,随着钉腿长度在一定范围内增加,接头成形质量具有更好的变化趋势。在钉腿长度相同时,上、下连接板分别为DP590钢和AA6061铝合金的接头的自锁长度大于叠放顺序互换后的接头的自锁长度,钉腿长度为6.0 mm时,组号2接头的自锁长度最大。连接板的叠放顺序是影响接头自锁长度的最主要因素,且有限元模拟与试验验证结果一致。组号2和3接头的最大静载荷值分别大于组号2E和3E接头,且组号2的接头的抗拉伸性能最好。自锁长度是影响接头静力学性能最重要的参数。从宏观形貌观察,接头拉伸失效形式均为自锁失效;从典型拉伸失效断口的微观组织发现,上连接板断口呈韧窝结构,下连接板铆钉孔自锁处有大量的微颗粒,这是因为自冲铆接接头拉伸失效时在自锁部位发生了严重的微动磨损。To investigate the forming quality and static mechanical properties for self-piercing riveted(SPR)joints of DP590 steel and AA6061 aluminum alloy,the simulation of self-piercing riveting was conducted by the finite element software Simufact Forming,and the self-piercing riveting test verification was conducted by using self-piercing riveting equipment.Then,the static tensile tests were also carried out on the joints.The results show that when the stacking order of connecting sheets is the same,the forming quality of joint has a better changing trend as the rivet leg length increases within a certain respectively range.When the rivet leg length is the same,the self-locking length of the joint whose upper and lower connecting sheets are DP590 steel and AA606l aluminum alloy respectively is greater than the self-locking length of the joint after the stacking order is interchanged.When the rivet leg length is 6.O mm,the self-locking length of group No.2 point is greatest.The stacking order of the connecting sheets is the most important factor affecting the self-locking length of the joints,and the finite element simulation result is consistent with the test verification result.The maximum static load values of group No.2 and No.3 joints are greater than those of group No.2E and No.3E joints,respectively,and group No.2 joint has the best tensile resistance.The self-locking length is the most important parameter affecting the static mechanical properties of the joints.From the macroscopic morphological observation,the tensile failure mode of the joints is self-locking failure,and from the microstructure of the typical tensile failure fracture,it is found that the fracture of the upper connecting sheet has a dimple structure and there are a large number of micro-particles in the self-locking area of the rivet hole on the lower connecting sheet,this is because that a serious frtting wear in the self-locking area when the self-piercing riveted joint fails in tension.

关 键 词：自冲铆接 DP590钢板 AA6061铝合金板 钉腿长度 自锁长度 

分 类 号：TG938[金属学及工艺—钳工工艺]