Recent developments in flat-clinching
Recent developments in flat-clinching
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DOI：
10.1016/j.commatsci.2013.07.013
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发表时间：
2014-01-01
影响因子：
3.3
通讯作者：
Awiszus, Birgit
中科院分区：
文献类型：
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作者：
Gerstmann, Thoralf;Awiszus, Birgit
由于智能轻量化结构的兴起以及由此带来的连接技术的变化，开姆尼茨工业大学的虚拟生产工程主席开发了平扣技术。利用这种技术，可以连接同类材料（金属和金属，如钢和铝），也可以连接不同种类的材料（如铝和塑料）。该工艺是一种单步机械连接方法，无需任何准备工作（例如，预冲孔，倒角）或额外的补充连接元素（例如，螺钉，铆钉）即可将材料组合在一起。变形过程中材料的流动受到决定性的影响，使接合材料发生挠曲；夹紧连接的一种特征，它在总材料厚度内产生力和形状封闭的联锁。因此，创建了单侧平面材料化合物，其与传统夹紧工艺中产生的连接相反，不显示延伸出材料平面的模侧突出。因此，平扣技术甚至可以成功地应用于可见区域和功能表面。材料总厚度内机械联锁的形成是一个受多种因素影响的过程，具有多因素关系。为了量化这些因素并显示连接形成过程中的物质流动，采用有限元方法对连接过程进行了建模。通过进行系统的数值分析，可以优化影响联锁成形的参数，从而影响化合物的剪切强度和拉伸强度。通过实验验证了数值模拟模型的正确性。(C) 2013 Elsevier B.V.版权所有
Due to the rise in intelligent light weight construction and the resulting change in joining technologies, flat-clinch-technology was developed at the Chair of Virtual Production Engineering at Chemnitz University of Technology. Using this technology, it is possible to join materials of the same kind (metal and metal, e.g., steel and aluminum), as well as materials of different kinds (e.g., aluminum and plastics). The process is a single step mechanical joining method that combines materials without any preparatory work (e.g., pre-punching, chamfering) or additional complementary joining elements (e.g., screws, rivets). The material flow during the deformation is decisively influenced so that the join materials cramp; a characteristic feature of clinch connections, which results in a force- and form-closed interlocking within the total material thickness. Thus, a one-sided planar material compound is created, which in contrast to connections produced in conventional clinching processes, does not show the die-sided protrusion extending out of the material plane. Therefore, flat-clinch-technology can be successfully applied even in visible areas and functional surfaces.The formation of the mechanical interlocking within the total material thickness is a process influenced by numerous factors with multi-factorial relationships. In order to quantify these factors and to display the material flow during the formation of the connection, the joining process was modeled by means of the Finite-Element-Method (FEM). By performing a systematic numerical analysis it was possible to optimize the parameters that influence the forming of the interlocking and consequently the shear strength and tensile strength of the compound. The numerical simulation models were validated by experimental investigations. (C) 2013 Elsevier B.V. All rights reserved.