Numerical simulation and experimental examination of forming defects in multi-point deep drawing process
Numerical simulation and experimental examination of forming defects in multi-point deep drawing process
复制标题
DOI：
10.5755/j01.mech.22.3.15252
复制
发表时间：
2016-01-01
期刊：
影响因子：
0.7
通讯作者：
Davoodi, B.
中科院分区：
文献类型：
--
作者：
Beglarzadeh, B.;Davoodi, B.
需要显著降低制造成本以使结构材料对于诸如汽车部件的大规模生产应用具有吸引力。这可以通过高效的多点成形操作来实现，这已经证明了其生产具有非常好的结构完整性和质量的金属产品的能力。本文针对多点拉深成形过程中出现的成形缺陷进行了数值模拟和实验研究。在这项研究中，商用有限元软件ABAQUS / EXPLICIT 6.14.1用于模拟成形过程。为了分析板材在多点拉深过程中的行为，并表示在成形过程中可能发生的缺陷，将利用三维模型。采用初始尺寸为300 × 300 mm的2024铝合金板材进行了多点成形试验，研究了多点成形过程中产生的缺陷，并采用韧性断裂准则对成形板材的断裂进行了预测。研究不同硬度聚氨酯层的压边保持器力，发现压边保持器力的增加与聚氨酯层硬度的增加有直接关系。模拟结果表明，随着聚氨酯层厚度的增加，压入率降低。通过对各单元的Cockcroft -莱瑟姆准则和Clift准则的比较，发现与Clift准则相关的单元达到破裂的时间较早。
Significant reductions in manufacturing costs are required to make structural material attractive for mass production applications such as automotive components. This can be achieved through highly efficient multi point forming operation, which has proven its ability to produce metal products with very good structural integrity and quality. This paper aims at studying forming defects which occur in multi-point deep drawing method through simulation and experimentation. In this study, commercially available finite element software ABAQUS / EXPLICIT 6.14.1 was used for the simulation of forming procedure. In order to analyze sheet behavior in multi point deep drawing procedure and also representing defects which may happen during the forming process, three-dimensional models will be utilized. The experimental tests were carried out through using Sheets of aluminum alloy 2024 with an initial size of 300 x 300 mm. Defects created in the multi-point forming process was investigated and rupture of forming sheet was predicted by using ductile fracture criteria. Studying blank holder force for Polyurethane layers with different hardness reveals that blank holder force increase has a direct relation with the increase in polyurethane layer hardness. The results of simulation depict that by increase in the thickness of polyurethane layer, the rate of indentation is reduced. By comparison of the Cockcroft - Latham and Clift criteria of each element, it is seen that elements which are related to Clift criterion reach to rupture earlier.