【作者】 何涛；

【导师】 石柏军；

【作者基本信息】 华南理工大学 ， 车辆工程， 2010， 硕士

【摘要】 机械变形连接是一项起源于德国的钣金件连接技术。近年来,由于传统的钣金件连接技术越来越不能满足经济性,环保性,安全性的基本要求,机械变形连接凭借其特有的优势在世界范围内迅速发展,应用于工业各个领域,如汽车,航空航天,建筑等。然而,在国内机械变形连接研究甚少,该技术在国内的应用也远不如其他发达国家成熟。因此,本文针对于此,对机械变形连接的成型机理,仿真技术,模具参数选配方法以及关键模具几何参数与连接点质量关系进行了研究讨论。具体如下:本文建立了机械变形连接动态过程的有限元模型,讨论了模拟过程中关键技术的应用及其对有限元结果造成的影响。如速率放大,网格参数优化配置以及ALE网格自适应技术等。通过数值模拟与实验对比分析,验证了有限元数值模拟的正确性和有效性。说明了可以将机械变形数值仿真技术应用到解决实际压力连接过程中的选型,设计、质量等各种问题中去。同时本文在基于有限元数值仿真的基础之上,创新性的提出了基于体积算法的模具参数选配理论,并结合数值计算与剪切、剥离试验验证了该选配理论的正确性。最后,本文通过有限元分析结果与试验结果综合分析讨论了模具关键参数对连接点质量的影响。为机械变形连接模具选型与设计提供了理论参考价值。更多还原

【Abstract】 The clinch forming process is a new branch of sheet joining technology which originated in Germany. In recent years, because of the low efficiency of economical, low security and less green about the traditional joining technique, the Clinching has rapidly developed around the world and used on the industrial scale, such as automobile industry, aircraft industry, building industry. However, in China,the application of clinching is still at an early age and very few studies has taken place in this area. In view of this, this work proposed a fast and efficient finite element method for studying clinch forming with respecting to the die parameters, raised a new method which can select the best tool shape for specified mechanical characteristics, sheet thickness and discussed the relationship about the key parameters and the quality of the press joint.In order to ensure the accuracy of the numerical result, the optimization design of the mesh parameters,ALE adaptive meshing technique were used. In additional, amplifying the punch velocity was used to reduce the computing time. Experimental and numerical results are compared in this work for proving the validity of the finite element method and the result indicates that it has much significance in the die matching, optimization and quality problems. Furthermore, a new volume calculative method was proposed to determine the value of the die parameters based on the FEM and the tensile testing and shear testing results show that the die parameters which be selected were appropriate. And the last, the influence of the major parameters on the mechanical behavior of clinched joint were discussed in this paper and the relationship between them were given, which is useful for clinching tool designing.更多还原