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Optimal placement of metal foils in ultrasonic consolidation process.

机译:超声波固结过程中金属箔的最佳放置。

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摘要

Ultrasonic Consolidation is a combination of additive and subtractive manufacturing processes resulting in considerable material waste. This waste is a function of the geometry of the part being manufactured and of the relative placement of the layer with respect to the metal bands. Thus the waste may be minimized by careful choice of the layer angle and offset from the original position.; Previous work done in this field had developed an automated algorithm which optimally places and orients the individual slices of the STL file of the artifact being manufactured. However, the problem was solved on a 2-D scale and the 3-D nature of the part was not considered for the development of the algorithm. The earlier algorithm employed approximation on the input data to minimize the computational expense. This resulted in convergence of the optimizer to suboptimal solutions. Further, as the final part is made of anisotropic material the relative angles and overlap between subsequent layers also plays an important role in the final part strength. Finally, it is noted that the build time required for the ultrasonic consolidation process is a function of the number of bands required to form each slice.; Considering these limitations and opportunities, this thesis presents an algorithm which optimally orients and places the part layers with respect to aluminum bands in order to minimize the waste formed and the build time required. The algorithm has the capability of increasing the part strength by forming crisscross and brick structures using the metal foils. This research work also improves on the previous algorithm by extending the functionality of the algorithm by building in capability to handle multiple loops within the same slice and non convex slice data. Further, the research studies the choice of optimizer that needs to be employed for different types of input data.
机译:超声波固结是增材制造和减材制造工艺的结合,导致大量的材料浪费。这种浪费取决于所制造零件的几何形状以及该层相对于金属带的相对位置。因此,可以通过仔细选择层角度和与原始位置的偏移来最大程度地减少浪费。在该领域中完成的先前工作已经开发了一种自动算法,该算法可以最佳地放置和定向要制造的工件的STL文件的各个切片。但是,该问题已在2-D尺度上解决,并且在开发算法时未考虑零件的3-D性质。较早的算法在输入数据上采用了近似值,以最大程度地减少计算费用。这导致优化器收敛到次优解决方案。此外,由于最终部件是由各向异性材料制成的,因此后续层之间的相对角度和重叠也对最终部件的强度起着重要作用。最后,要注意的是,超声固结过程所需的建立时间是形成每个切片所需的条带数量的函数。考虑到这些局限性和机遇,本文提出了一种算法,该算法针对铝带对零件层进行最佳定向和放置,以最大程度地减少形成的废料和所需的制造时间。该算法具有通过使用金属箔形成十字形和砖形结构来提高零件强度的能力。这项研究工作还通过增强处理相同切片和非凸切片数据内的多个循环的能力来扩展算法的功能,从而对以前的算法进行了改进。此外,研究研究了需要用于不同类型的输入数据的优化器的选择。

著录项

  • 作者

    Rexavier, Raji.;

  • 作者单位

    Clemson University.;

  • 授予单位 Clemson University.;
  • 学科 Engineering Mechanical.
  • 学位 M.S.
  • 年度 2007
  • 页码 135 p.
  • 总页数 135
  • 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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