共查询到20条相似文献,搜索用时 62 毫秒
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随着新能源汽车车身轻量化的发展,铝合金复合材料在车身上逐渐被采用。由于传统焊接不适用于铝合金材料的连接,自冲铆接技术在全铝车身上的应用得到了重视。自冲铆接技术是一种冷连接技术,多片材料无需预先穿孔即可连接在一起。因此,研究自冲铆接工艺的接头性能和质量对车身轻量化有着重要的意义。基于国内外自冲铆接技术的发展现状,综合评述了接头性能的评价参数,归纳了铆钉、凹模、冲头和板料工艺参数对接头性能影响的特点,分析了其关键作用和优先程度,可用于指导自冲铆接技术工艺的开发过程。此外,通过对国外根据工艺参数对接头几何性能和抗剪强度进行预测的方法的总结,分析了国内与国外在强度预测方面存在的差距,提出了我国自冲铆接技术进一步研究的方向。 相似文献
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单搭自冲铆接过程的数值模拟及质量评价 总被引:1,自引:0,他引:1
自冲铆接是在板料和铆钉之间形成连接而不需要预冲孔的新工艺。介绍了自冲铆接的原理,利用有限元软件LS—DYNA对单搭自冲铆接工艺过程进行数值模拟,分析了铆接成形过程、应力应变和时间-载荷变化趋势,对铆接效果及质量进行了评价。 相似文献
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自冲铆接是在板料和铆钉之间形成连接而不需要预冲孔的新工艺。介绍了自冲铆接的原理,利用有限元软件LS-DYNA对单搭自冲铆接工艺过程进行数值模拟,分析了铆接成形过程、应力应变和时间-载荷变化趋势,对铆接效果及质量进行了评价。 相似文献
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以汽车零/部件常用材质双相钢和铝合金的自冲铆接接头为研究对象,采用Simufact.forming有限元模拟仿真软件建立双相钢DP600和铝合金AA6061的自冲铆模型,按基板的不同叠放顺序和铆钉规格进行自冲铆接数值模拟。通过分析铆接接头的钉头高度等参数,找出了铆钉长度和基板的叠放顺序对上下2种叠层材料自冲铆接过程及接头连接质量的影响规律。结果表明:DP600和AA6061为基板的自冲铆接模拟仿真试验中,铆钉长度为6.0 mm时的连接质量最优;铆钉相同而基板叠放顺序互换时,上层为DP600和下层为AA6061的铆接接头质量优于基板叠放顺序互换的铆接接头质量;铆钉长度在一定范围内增大可提高自冲铆接接头的自锁性能,提升自冲铆接接头的质量。 相似文献
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S. Hossein Cheraghi K. Krishnan Bijay Bajracharya 《The International Journal of Advanced Manufacturing Technology》2008,39(11-12):1144-1155
Sheet metal parts are widely used in the assembly of aircraft. The most common method of assembling sheet metal parts is through riveting. Failure of a rivet can have severe consequences in terms of loss of human lives and money. There are many parameters associated with a riveting process that directly affect the quality of rivets including squeeze force, rivet length, rivet diameter, and hole diameter tolerance. Incorrect selection or variations in these parameters could induce excessive residual stresses that result in stress concentration sites and initiate cracks, and also result in improper rivet head deformation leading to loose rivets. This paper presents a study of the effect of the aforementioned riveting parameters on the quality of a formed rivet using finite element simulation. The study was part of a larger project carried out for the local aircraft industry and hence, uses the inch system. The research is conducted on a 1/8″ (0.125″) diameter rivet and a 0.064″ thick aluminum sheet. The results indicate that under normal variations in the riveting process parameters, when using the recommended countersunk depth of 0.042″ for rivet hole, most rivets that are formed will not meet the quality requirements. This is primarily due to the existence of a gap between the formed rivet and the hole. Decreasing the countersunk depth to 0.032″ allows for a higher range of hole and rivet diameter tolerances, as well as an increase in the range of squeeze force that can be applied without violating the quality requirements. 相似文献
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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。 相似文献
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Rotorcraft airframes are complex structures designed to satisfy different goals; fatigue life represents one of the most critical issues, which must be guaranteed throughout the design and the construction phase. In this scenario riveted joints play an important structural role especially because of the variable loads they are subjected to. Their fatigue behaviour is strictly influenced by the local stress fields left very near to the holes during riveting manufacturing operations. Therefore, with the aim to improve design awareness, the effects of the different parameters involved during the riveting process are herein investigated. The effects of the squeeze force, the clearance, the rivet length and the clamping angle in the stress field of the joints are considered by means of numerical models. Detailed finite elements models (including rivet forming formation) are validated through experimental tests. These models are aimed at obtaining an accurate stress–strain field in the most stressed zone including the residual stress in the holes. Finally, using the literature fatigue data of Al8090-T81 and the Crossland multiaxial fatigue criterion, the influence of the riveting parameters on the fatigue strength is evaluated for optimisation purposes. 相似文献
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Lei Changyi Li Jiangxiong 《The International Journal of Advanced Manufacturing Technology》2020,107(1):229-245
The International Journal of Advanced Manufacturing Technology - Slug rivet interference-fit riveting is an advanced connection technology. The quality of riveted aircraft structures can be evolved... 相似文献
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Faisal Aman S. Hossein Cheraghi Krishna K. Krishnan Hamid Lankarani 《The International Journal of Advanced Manufacturing Technology》2013,67(1-4):545-562
Sheet metal parts are widely used in the assembly of aircraft. The most common method of joining sheet metal parts is through riveting. There are many parameters associated with a riveting process that affect the quality of rivets and the integrity of the final assembled product. This paper presents a study on the effect of some controllable process parameters in riveting (i.e., the sequence of riveting, distance between rivets (pitch), and gap between sheets) on the quality of riveted lap joints and the formed rivets. The study is performed on a one eight-inch nominal diameter flat head Tinner rivet and 0.064-in.-thick aluminum sheet. Finite element simulation is used as a means of modeling and analysis of the riveting process. Statistical design of experiment is employed to analyze the simulation data. A good combination of riveting process parameters is found which minimizes the residual stress in sheets and rivets, bulging and material growth in sheets, and which reduces the chances of postriveting clearance in a riveted lap joint. 相似文献
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、切实做好过程策划工作 ,提高工艺工作的准确性 过程策划是过程质量控制的重要内容 ,是确保各产品质量形成过程按程序文件的规定、程序和方法在受控状态下长期有效运行的一项重要工作。为了保证所设计产品的质量 ,工艺工作必须未雨绸缪。在产品设计开发初期 ,就应以用户要求为基础 ,并超过产品要求进行产品生产的基础策划 ,制订详细的过程开发计划 ,充分考虑现有人员、工装、装备、技术能力、物流、生产环境等各方面的因素 ,明确各接口部门的工作任务和职责 ,将各项任务的目标值和时间表具体细化到各接口部门 ,并按照任务要求进行检查督… 相似文献