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.     

质量放大系数对三代轮毂轴承旋压铆合仿真的影响

为提高三代轮毂轴承旋压铆合有限元仿真分析效率,探讨质量放大系数对旋压铆合工艺的影响.通过控制质量放大系数的显式有限元方法对该工艺方法进行仿真,对比分析不同质量放大系数下小内圈的外径膨胀量和位移、翻边的外径差、铆装力、应力和总体载荷的变化,并与实际测得的数据进行对比.结果表明:合适的质量放大系数能够在一定程度上保证旋压铆...     

电磁铆接过程数值模拟

电磁铆接是一种新型铆接工艺,铆接过程中材料的应变率高,铆钉材料的变形方式不同于普通铆接.通过电磁铆接过程的数值模拟分析影响铆接质量的因素,重点分析铆模几何构形对铆钉镦头成形的影响,为铆模优化设计提供了理论依据.数值模拟发现改变铆模倾角可以改变镦头区的应力分布,从而改变镦头区应变分布;减小铆模倾角可以减小最大剪应力,从而减小剪应变,防止镦头裂纹的产生.镦头金相组织表明数值模拟结果符合实际情况.     

包钢焦化厂大跨度门式装卸吊车安装技术

主要介绍了大跨度(76.2 m)全铆接钢结构门式装卸吊车利用临时支架,安装支腿和桥架的施工过程,为今后类似工程实施提供了成功的经验.     

TRIZ理论在自冲铆接机框架设计中的应用

为了提高传统自冲铆接机C型框架的适应性,增大其应用领域,首先介绍了传统自冲铆接机C型框架,并分析了传统自冲铆接机C型框架的喉深有限、适应性差等不足。然后利用技术创新理论TRIZ对传统自冲铆接机C型框架进行分析,提出技术矛盾,利用冲突矩阵找到可行的解决矛盾的方法原理,对传统自冲铆接机C型框架进行了创新型设计。最后提出了一种喉深可调自冲铆接机框架。该框架操作方便,结构简单,可以提高自冲铆接机的适应性,同时结果表明技术创新理论TRIZ有助于产品的创新型设计。     

基于振动试验的典型铆接形式仿真建模方法研究

基于三种典型铆接结构形式为研究对象,先通过振动试验方法分别研究其固有频率和振型。再运用几种不同的仿真建模方法分别建立动力学分析模型,研究其动力学特性,并与试验结果进行比较分析,验证了各种方法的正确性和有效性。在此基础上,提出了复杂工程分析问题中存在大量铆接装配关系时的有限元建模方法。     

粘接剂对自冲铆-粘接复合接头强度的影响及数理统计分析

以自冲铆接和自冲铆-粘接复合接头为对象,采用数理统计分析检验实验数据合理性,进而对比不同材料组合及连接方式来分析粘接剂对自冲铆接接头强度的影响。实验表明,自冲铆接的剪切强度比剥离强度高;粘接剂对异种材料组合(硬质材料置于上板)自冲铆接的影响较同种材料组合自冲铆接更显著;异种材料组合(硬质材料置于上板)自冲铆-粘接复合技术,采用胶层厚度为0.1mm时,可获得有效的连接结构且具有良好的承载能力;T型异种材料组合压印连接吸震、缓冲效果更好。