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首页> 外文学位 >Computer modeling of complex metal forming processes using the upper bound elemental technique (UBET) and modified upper bound elemental technique (MUBET).
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Computer modeling of complex metal forming processes using the upper bound elemental technique (UBET) and modified upper bound elemental technique (MUBET).

机译：使用上限元素技术（UBET）和改进的上限元素技术（MUBET）对复杂的金属成型过程进行计算机建模。

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摘要

Metal forming is one of the most important manufacturing techniques that has been used to produce a variety of metal products for centuries. This dissertation addressed the development and use of mathematical models for the analysis and design of profile ring rolling, complex forging processes, and forging pre-form design using backward simulation.; The objective of this research work is to develop a mathematical model for profile axial-radial ring rolling and closed-pass ring rolling and to establish an effective design tool to determine optimum forging strategy for a given final geometry, which implies maximum material utilization and reduction of die design tryouts and manufacturing costs by using appropriate pre-form, achieving required microstructure, identifying critical process variables and parameters in order to improve the consistency of the process, and reducing material waste and energy consumption.; The developed model for simulating the process of axial-radial profile ring rolling and closed-pass profile ring rolling is based on the Upper Bound Elemental Technique (UBET). Also, the models developed for forging pre-form design as well as forging process are based on modified UBET, in which the kinematical admissible velocities fields are derived based on volume mapping approach and evaluated by minimizing the total energy rate of UBET.; The developed models have been successfully tested and implemented using verities of test cases. These models have several advantages, such as computation efficiency, while maintaining a reasonable degree of accuracy as well as capabilities to predict the various process variables.; The research work developed can be applied directly or with simple modifications to other forming processes. The developed models have several advantages, such as prediction of process variables with acceptable accuracy and with quick calculation time. These models can be used as analysis and design tools.
机译：金属成型是最重要的制造技术之一，已被用于生产各种金属产品已有数百年历史。本文研究了数学模型的开发和应用，该模型用于分析和设计型材环轧，复杂的锻造工艺以及使用反向仿真进行的锻造预成型件设计。这项研究工作的目的是开发一种用于轮廓径向-径向径向轧制和封闭式环形轧制的数学模型，并建立有效的设计工具来确定给定最终几何形状的最佳锻造策略，这意味着最大程度地利用和减少材料通过使用适当的预成型件，获得所需的微结构，确定关键的工艺变量和参数以提高工艺的一致性并减少材料浪费和能耗，来降低模具设计的试制和制造成本。基于上界元素技术（UBET）建立的用于模拟轴向-径向轮廓环轧制和封闭式轮廓环轧制过程的模型。同样，为锻造预型件设计和锻造工艺开发的模型基于改进的UBET，其中基于体积映射方法得出运动学允许的速度场，并通过最小化UBET的总能率进行评估。所开发的模型已通过测试案例的验证成功进行了测试和实施。这些模型具有许多优势，例如计算效率，同时保持合理的准确性，以及预测各种过程变量的能力。所开发的研究成果可以直接应用，也可以简单地修改其他成形工艺。所开发的模型具有多个优点，例如以可接受的准确性和快速的计算时间来预测过程变量。这些模型可以用作分析和设计工具。

著录项

  • 作者

    Al-Mohaileb, Mazyad M.;

  • 作者单位

    Ohio University.;

  • 授予单位 Ohio University.;
  • 学科 Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 2004
  • 页码 187 p.
  • 总页数 187
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 机械、仪表工业;
  • 关键词

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