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首页> 外文会议>ASME international manufacturing science and engineering conference 2011 >FORMABILITY AND SURFACE FINISH STUDIES IN SINGLE POINT INCREMENTAL FORMING
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FORMABILITY AND SURFACE FINISH STUDIES IN SINGLE POINT INCREMENTAL FORMING

机译：单点渐进成形中的可塑性和表面精加工研究

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摘要

Incremental sheet metal forming (ISMF) has demonstrated its great potential to form complex three-dimensional parts without using a component specific tooling. The die-less nature in incremental forming provides a competitive alternative for economically and effectively fabricating low-volume functional sheet parts. However, ISMF has limitations with respect to maximum formable wall angle, geometrical accuracy and surface finish of the component. In the present work, an experimental study is carried out to study the effect of incremental sheet metal forming process variables on maximum formable angle and surface finish. Box-Behnken method is used to design the experiments for formability study and full factorial method is used for surface finish study. Analysis of experimental results indicates that formability in incremental forming decreases with increase in tool diameter. Formable angle first increases and then decreases with incremental depth and it is also observed that the variation in the formable angle is not significant in the range of incremental depths considered to produce good surface finishes during the present study. A simple analysis model is used to estimate the stress values during incremental sheet metal forming assuming that the deformation occurs predominantly under plane strain condition. A stress based criterion is used along with the above mentioned analysis to predict the formability in ISMF and its predictions are in very good agreement with the experimental results. Surface roughness decreases with increase in tool diameter for all incremental depths. Surface roughness increases first with increase in incremental depth up to certain angle and then decreases. Surface roughness value decreases with increase in wall angle.
机译：渐进式钣金成型（ISMF）已证明其无需使用组件专用工具即可形成复杂的三维零件的巨大潜力。增量成型中的无模头性质为经济有效地制造小批量功能性片零件提供了竞争性选择。但是，ISMF在最大可成型壁角，几何精度和组件的表面光洁度方面存在局限性。在目前的工作中，进行了一项实验研究，以研究增量钣金成形工艺变量对最大可成形角度和表面光洁度的影响。 Box-Behnken方法用于设计可塑性研究的实验，而全因子方法用于表面光洁度的研究。实验结果分析表明，随着刀具直径的增加，渐进成形中的可成形性降低。可成形角度首先随着增加的深度而增加，然后减小，并且还观察到，在本研究中，可成形角度的变化在认为产生良好表面光洁度的增加深度范围内并不显着。假设变形主要发生在平面应变条件下，可以使用一个简单的分析模型来估算钣金增量成形过程中的应力值。基于应力的准则与上述分析一起用于预测ISMF中的可成形性，其预测与实验结果非常吻合。对于所有增量深度，表面粗糙度均随工具直径的增加而减小。表面粗糙度首先随着增加的深度增加到一定角度而增加，然后减小。表面粗糙度值随着壁角的增加而减小。

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