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首页> 外文期刊>Journal of Materials Engineering and Performance >Finite Element Analysis of Material Flow in Mechanical Clinching with Extensible Dies
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Finite Element Analysis of Material Flow in Mechanical Clinching with Extensible Dies

机译：机械冲模加长模头材料流动的有限元分析

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摘要

An investigation of the material flow during the clinching process with extensible dies is carried out. Clinched joints were produced under different forming loads to evaluate the evolution of the joints' profile experimentally. Tensile-shear tests were conducted to evaluate the influence of the forming load on mechanical strength of the clinched joint. Since the joints' strength depends on the joints' profile, which in turn depends on the punch-die cavity volume, an analysis of the forces acting on the extensible dies was carried out. A finite element model was developed and validated by comparing the predicted and measured material flow and quality criteria (e.g., neck thickness and undercut). Therefore, the FE model was utilized to analyze the evolution of contact forces acting on the die sectors during the joining process. Furthermore, the main causes of the asymmetry in the cross section of such joints have been studied. It turned out that the axial asymmetry due to material flow within the gap between consecutive die sectors increases with the punch force and the sheet thickness.
机译：使用可延伸的模具对压接过程中的材料流动进行了研究。在不同的成型载荷下生产出弯缝接头，以通过实验评估其轮廓的演变。进行拉伸剪切试验以评估成形载荷对压接接头机械强度的影响。由于接头的强度取决于接头的轮廓，而接头的轮廓又取决于冲模腔的体积，因此对作用在可拉伸模具上的力进行了分析。通过比较预测和测得的材料流量和质量标准（例如颈部厚度和底切），开发并验证了有限元模型。因此，有限元模型被用来分析在连接过程中作用在模具部分上的接触力的变化。此外，已经研究了这种接头的横截面不对称的主要原因。事实证明，由于材料在连续模具扇区之间的间隙内流动而引起的轴向不对称性随冲压力和片材厚度的增加而增加。

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