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EFFECT OF GROUND SURFACE DEPTH IN HELICAL COMPRESSION SPRING STRESSES

机译:地面深度在螺旋压缩弹簧应力中的影响

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A prevalent coal mill design uses stiff compression springs to force rolls onto a rotating bowl to grind coal prior to combustion in a boiler. The springs are usually plain end (constant pitch) with ground flats at each end. Preloads on these springs are typically 10,000lb to 40,000lb. These springs most often fail in fatigue near the ground flat at ends of the spring. Detailed finite element analyses show that stress concentrations are developed near the flat surface at each end of the spring. First, this paper presents some field experience of spring failures. Then, a parametric study of the depth of the ground of a typical spring showing the effect of this geometry change on spring wire stress concentrations is presented. Modeling the solid volume of the helical spring wire with a mechanical drawing program was developed. This geometry was imported into a finite element program for the rest of the modeling. A cutting plane was used to depict the ground flat. The resulting volume was then meshed with solid finite elements. A force was applied to the ground flat area of one end to stress the spring while the other spring end is constrained in all six degrees of freedom. Some typical spring failures that occurred in the field are presented showing agreement between the predicted location of the stress concentration and the failures.
机译:普遍的煤磨机设计使用坚硬的压缩弹簧,以在燃烧锅炉燃烧之前滚动到旋转碗上以研磨煤。弹簧通常是普通的端部(恒定间距),每个端部处于接地平面。这些弹簧上的预载荷通常为10,000LB至40,000Lb。这些泉水最常在突然间在弹簧的端部附近失败。详细的有限元分析表明应力浓度在弹簧的每个端部的平坦表面附近开发。首先,本文介绍了弹簧故障的一些现场体验。然后,介绍了典型弹簧的地面深度的参数研究,示出了这种几何形状变化对弹簧胁迫浓度的效果。开发了用机械拉伸程序建模螺旋弹簧线的固体体积。将该几何图形导入为其他建模的有限元程序。切割平面用于描绘平坦的地面。然后用固体有限元素啮合得到的体积。将力施加到一端的地平坦面积以应力弹簧,而另一个弹簧端被限制在所有六个自由度中。在该领域发生的一些典型的弹簧故障显示在应力集中的预测位置与故障之间的一致性。

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