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The mechanics of slitting and cutting webs.

机译：切割和切割网的力学。

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摘要

The quality of edges formed during cutting and slitting of thin polymer webs is important for many industrial applications. In order to control the edge quality of the separated material, it is necessary to understand cutting. A model is proposed and the mechanics of cutting are described. An apparatus was constructed to instrument, monitor and control the web slitting process. The slitting speed, tension in the web, blade sharpness and angle of cut were varied during tests. This allowed a quantitative understanding of the cutting mechanisms to be established. The results of the experiments showed the in-plane cutting forces were minimally affected by changes in rate or speed and independent of web tension for sharp blades. The angle of cut had a pronounced effect on the in-plane cutting forces and the stability of the cut. Further experimentation was designed to relate force to plastic deformation caused by a wedge indenting the edge surface of a polymer sample. These experiments clearly revealed the shape of the plastic deformation zone ahead of and around the wedges. Data from the experiments showed increasing cutting force with wedge displacement until the sample fractured. Plastic deformation of the samples was then examined in detail. The results showed out-of-plane plastic volume was equal to the volume displaced by the wedge. Samples also exhibited constant hardness during initial phases of wedge indenting. A finite element model concurred with the empirical plastic zone data. An innovative method was developed to take a dynamic “snapshot” of web displacement around the blade. The results clearly showed the web buckling ahead of the blade producing major instability during the cutting and slitting of thin webs. A finite element model supported the characteristics of the buckling phenomena observed in thin webs.; An understanding of the interaction of cutting parameters and the buckling instability will allow quality web edges with minimal deformation and straight stable separation to be achieved. This work provides the foundation for a mechanistic understanding of deformation and instabilities taking place during the slitting and cutting of thin webs.
机译：在切割和纵切薄聚合物纤维网期间形成的边缘质量对于许多工业应用而言很重要。为了控制分离材料的边缘质量，必须了解切割。提出了一个模型并描述了切割的机理。构造了一种仪器来检测，监视和控制幅材纵切过程。在测试过程中，纵切速度，纤网中的张力，刀片的锋利度和切割角度均发生了变化。这样就可以定量地了解切割机理。实验结果表明，平面切削力受速率或速度变化的影响最小，并且与锋利的刀片的幅材张力无关。切削角度对面内切削力和切削稳定性有显着影响。设计了进一步的实验，以将力与由于楔入聚合物样品的边缘表面而引起的塑性变形有关。这些实验清楚地揭示了楔形之前和周围的塑性变形区的形状。实验数据表明，随着楔形位移，切削力不断增加，直到样品破裂为止。然后详细检查样品的塑性变形。结果表明，平面外塑料体积等于由楔形位移的体积。在楔形压痕的初始阶段，样品还显示出恒定的硬度。有限元模型与经验塑性区数据一致。开发了一种创新的方法来对幅材在刀片周围的位移进行动态“快照”。结果清楚地表明，在切割和切割薄幅材时，幅材在锯片之前弯曲，从而产生较大的不稳定性。有限元模型支持薄网中观察到的屈曲现象的特征。对切​​削参数和屈曲不稳定性的相互作用的理解将使高质量的幅材边缘具有最小的变形和笔直的稳定分离。这项工作为从机械角度理解在切割和切割薄幅材时发生的变形和不稳定性提供了基础。

著录项

  • 作者

    Meehan, Richard Raymond.;

  • 作者单位

    The University of Rochester.;

  • 授予单位 The University of Rochester.;
  • 学科 Engineering Materials Science.; Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 2003
  • 页码 113 p.
  • 总页数 113
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;机械、仪表工业;
  • 关键词

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