铝电解电容器等效串联电阻的分析及控制

文章分析了铝电解电容器等效串联电阻对产品性能的影响,讨论了等效串联电阻的构成及其影响因素,阐述了铝电解电容器生产中控制等效串联电阻的对策,推出了一种改进的铆接工艺,能够有效降低、稳定电极箔与引线间的铆接接触电阻。     

磁铁铆具结构及设计

通过对磁铁工艺性分析,设计了合理的磁铁铆具,介绍了磁铁铆具结构、铆具工作过程及设计注意事项,说明了主要结构件设计思路及工作原理。该铆具结构稳定、可靠,制作成本低,使用方便,寿命长,铆压的磁铁质量好。     

组合点火管中2号管作用可靠性的提高

分析了组合点火管中2号管作用率偏低的原因，提出其改进措施－点铆式联结工艺。     

东尼载重车车架的组合铆接工位的限位夹具

论述了东尼牌系列载重车车架铆接生产线的设计方案及工作原理。     

基于ANSYS/LS-DYNA的自冲铆接铆钉腿部尖端几何参数的优化

近年来,自冲铆接作为一种新工艺越来越受到重视和青睐。本文利用大型有限元分析软件ANSYS/LS-DYNA建立的自冲铆接的二维有限元模型进行分析,对铆钉腿部尖端几何参数进行优化,得出了其最优的几何参数。     

浪形保持架特殊铆合模的设计及工艺改进

针对浪形保持架54等分铆合模等分球窝无法加工的问题,增加了工艺孔,减少了不必要模具的制造,节约了成本,缩短了生产周期。     

Assembly dimensional prediction for self-piercing riveted aluminum panels

Self-piercing riveting (SPR) is a high-speed mechanical fastening technique for joining sheet components. It has drawn more attention in recent years because it can join some advanced materials that are dissimilar, coated and hard to weld, such as aluminum sheets. Research results have shown that SPR improves joint properties in aluminum and steels. However, there has been concern that there might be dimensional issues due to relatively large material flows at SPR joint configurations. This paper presents the latest research progress in the assembly dimensional prediction area, using experimental data and finite element analysis results. It is found that the joint distortion of SPR as tested is much larger than that from resistance spot welding (RSW), and the inclusion of SPR joint distortion is generally needed for accurate global assembly predictions. To include the local SPR effect, a new algorithm to represent the SPR distortion has been developed. The new algorithm can be incorporated into special finite element analysis codes such as EAVS (elastic assembly variation simulation) to efficiently predict body assembly dimensions where spot joining processes are involved.     

板料连接技术进展

介绍板料连接技术进展。主要介绍半空心铆钉自冲铆接、实心铆钉自冲铆接、无模铆冲连接、有模铆冲连接、液压铆接等技术的工作原理，比较各种连接技术的优、缺点。     

A Comparative Study of Friction Self-Piercing Riveting and Self-Piercing Riveting of Aluminum Alloy AA5182-O

In this paper, self-piercing riveting (SPR) and friction self-piercing riveting (F-SPR) processes were employed to join aluminum alloy AA5182-O sheets. Parallel studies were carried out to compare the two processes in terms of joint macrogeometry, tooling force, microhardness, quasi-static mechanical performance, and fatigue behavior. The results indicate that the F-SPR process formed both rivet–sheet interlocking and sheet–sheet solid-state bonding, whereas the SPR process only contained rivet–sheet interlocking. For the same rivet flaring, the F-SPR process required 63% less tooling force than the SPR process because of the softening effect of frictional heat and the lower rivet hardness of F-SPR. The decrease in the switch depth of the F-SPR resulted in more hardening of the aluminum alloy surrounding the rivet. The higher hardness of aluminum and formation of solid-state bonding enhanced the F-SPR joint stiffness under lap-shear loading, which contributed to the higher quasi-static lap-shear strength and longer fatigue life compared to those of the SPR joints.     

磁阻型电磁铆接工艺研究

目的 为了掌握磁阻型电磁铆接新技术,研究工艺参数对铆接驱动力的影响规律.方法 通过改变放电电压、线圈导线截面尺寸和弹丸尺寸等参数进行磁阻型电磁铆接试验研究,分析各参数对直径为8 mm的2A10铆钉镦头变形的影响,与感应式电磁铆接的成形铆钉进行对比.结果 随着放电电压的升高,铆钉镦头变形量增加;相同放电能量下,导线截面尺寸为2 mm×3 mm的线圈铆钉变形量小于3 mm×4 mm的线圈,弹丸直径为33 mm的铆钉变形量要大于弹丸直径为28 mm铆钉的变形量.相同放电能量下,外径70 mm螺线管线圈铆钉的变形量大于外径为120 mm平板线圈铆钉的变形量.结论 线圈和弹丸的相关参数是影响磁阻型电磁铆接吸引力的重要参数.与感应式电磁铆接相比,磁阻型电磁铆接能量利用率更高,其线圈外径更小,为电磁铆枪小型化提供了一种新方式.