电流辅助对铆钉压铆过程及连接性能的影响  

The influence of electric current assist on rivet pressing and riveting process and connection performance

作　　者：陈卫林 王虎军 张川 CHEN Weilin;WANG Hujun;ZHANG Chuan(Anhui Tianhang Electromechanical Co.,Ltd.,Wuhu 241000,China)

机构地区：[1]安徽天航机电有限公司,芜湖241000

出　　处：《现代制造工程》2022年第5期88-93,共6页Modern Manufacturing Engineering

摘　　要：钛合金铆钉在塑性成型过程中存在变形抗力大、变形不均匀等问题。在铆接过程中引入电流辅助铆接技术可有效提升钛合金铆钉的铆接质量,其原理为通过在铆接过程中施加电流,改善金属铆钉塑性,提高铆钉的可加工性。以TA2M航空用铆钉为研究对象,研究了6种电流密度水平下铆钉的温升过程与成型效果,并开展拉伸试验与疲劳试验研究铆接件的力学性能。研究发现,通电会在较短时间内产生显著的焦耳热效应,这对难变形的钛合金铆钉来说是一种有效的热软化手段;通电带来的铆钉软化效应极大降低了加工难度,改善了镦头的成型效果;当通以电流密度为26 A/mm;的电流时,压铆力降低了24.69%,且镦头直径增大了6.80%,高度降低了14.04%,更加接近标准所要求的尺寸;电流辅助铆接技术对钛合金板连接件静态拉伸强度的影响不显著,但可有效提升连接件的疲劳寿命。Titanium alloy rivets have problems such as large deformation resistance and uneven deformation during the plastic forming process.The introduction of electric current assisted riveting technology in the riveting process can effectively improve the riveting quality of titanium alloy rivets, whose principle is to improve the plasticity of metal rivets and improve the workability of rivets by applying electric current during the riveting process.TA2 M aviation rivets were used as the research object, the temperature rise process and forming effect of rivets under 6 electric current density levels were studied, and tensile and fatigue tests were carried out to study the mechanical properties of the test pieces.The research found that energization will produce a significant Joule heating effect in a short time, which is an effective thermal softening method for hard to deform titanium alloy rivets, the rivet softening effect caused by energization greatly reduces the difficulty of processing and improves the forming effect of the upsetting head.When the electric current with a electric current density of 26 A/mm;is applied, the pressure riveting force is reduced by 24.69 %,the diameter of the upsetting head is increased by 6.80 %,and the height is reduced by 14.04 %,which is closer to the basic size required by the standard.The effect of electric current assisted riveting technology on the static tensile strength of the titanium plate connector is not significant, but it can effectively improve the fatigue life of the connector.

关 键 词：电流辅助 铆接 镦头成型 力学性能 

分 类 号：TH162[机械工程—机械制造及自动化]