Conventional engineering analyses for tube drawing processes have assumed an ideal material with uniform initial tube thickness; however, these assumptions limit the ability to address quality issues in the manufacturing industry. In this study, we present a finite element analysis model to analyze the tube drawing process with non-uniformity of the initial tube thickness and misalignment of the drawing die, using the implicit elastoplastic finite element method with a multibody treatment scheme (MBTS). We specifically focus on tube eccentricity. The plug in the MBTS is regarded as a deformable body with any fixed boundary condition in the lateral direction. Our analysis results show that an adequately tilted drawing die substantially reduces the eccentricity and thickness non-uniformity. The predictions are validated by comparison with experimental results in the literature.

拉管工艺的传统工程分析假设理想材料具有均匀的初始管厚度；然而，这些假设限制了解决制造业质量问题的能力。在本研究中，我们提出了一个有限元分析模型，使用带有多体处理方案（MBTS）的隐式弹塑性有限元方法来分析具有初始管厚度不均匀和拉拔模具未对准的管拉拔过程。我们特别关注管偏心率。MBTS中的塞体被视为横向上具有任意固定边界条件的变形体。我们的分析结果表明，充分倾斜的拉丝模具可以大大减少偏心度和厚度不均匀性。通过与文献中的实验结果进行比较来验证预测。