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首页> 外文会议>ASME international design engineering technical conferences and computers and information in engineering conference 2014 >DESIGN FOR DIMENSIONAL ACCURACY IN BENDING OPERATIONS: INTRODUCING THE CONCEPT OF FLATNESS LIMIT CURVES
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DESIGN FOR DIMENSIONAL ACCURACY IN BENDING OPERATIONS: INTRODUCING THE CONCEPT OF FLATNESS LIMIT CURVES

机译：弯曲操作中的尺寸精度设计：介绍平整度极限曲线的概念

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摘要

Eliciting knowledge about dimensional variability and influential parameters is crucial in competitive manufacturing. Moreover, this knowledge needs to be generalized and transferred into a practical tool box that design engineers can use as a decision basis in the early phases of product development processes when design flexibility is high and the 'cost of learning' is low. This paper introduces Flatness Limit Curves, a new Design For Manufacturing (DFM) tool, which is aimed at assessing cross-sectional distortions relative to dimensional tolerance requirements in bending operation. Analytical relationships are derived from the theoretical basis of continuum mechanics, applying the deformation theory of plasticity to plane stress sheet metal problems. The theoretical results are compared with experimental results obtained for hollow AA7xxx extrusions, which were formed in an industry-like rotary stretch bender in a controlled laboratory environment. The solutions are then structured and organized into a set of limit curves for assessing nominal flatness of the exterior of the cross section after bending. The associated variability may also be estimated by varying key input parameters to the tool (dimensional accuracy and material quality) within the capability ranges of the upstream process.
机译：汲取有关尺寸可变性和影响参数的知识对于竞争性制造至关重要。此外，需要将这些知识进行概括并转移到实用的工具箱中，当设计灵活性高且“学习成本”低时，设计工程师可以在产品开发过程的早期阶段将其用作决策基础。本文介绍了平面度极限曲线，这是一种新的制造设计（DFM）工具，旨在评估相对于弯曲操作中尺寸公差要求的横截面变形。解析关系是从连续力学的理论基础得出的，将塑性变形理论应用于平面应力钣金问题。将理论结果与中空AA7xxx挤压件的实验结果进行比较，这些挤压件是在受控实验室环境下在工业型旋转拉伸弯曲机中形成的。然后将解决方案构造和组织为一组极限曲线，以评估弯曲后横截面外部的标称平坦度。还可以通过在上游过程的能力范围内改变工具的关键输入参数（尺寸精度和材料质量）来估计相关的可变性。

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