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Analysis and modeling of chip ejection in deep hole drilling processes.

机译：深孔钻削过程中切屑排出的分析和建模。

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摘要

This research investigates chip ejection and formation in the drilling process. The chip ejection mechanism of discontinuous chips, chip thickening in deep hole drilling, spiral chip and string chip forming mechanism, and chip breaker in drilling are analyzed. An analytical model is developed to predict the smoothness of chip ejection, the optimum helix angle for chip transport, and the effect of chip initial speed on chip ejection. Drilling experiments have been conducted to validate the chip ejection speed and chip clogging estimated by the model. The variation of chip thickness across the drill cutting edge is observed. The chip thickness increases with the drilling depth. An analytical model is developed to evaluate and predict the effect of chip thickening on cutting forces. Based on this chip thickening mechanism, it is found that the increase of drilling forces in deep hole drilling is caused by chip thickening besides chip rubbing against the hole wall. The relationship between chip thickness and chip force is validated by drilling experiments. Two models are developed to predict the spiral and string chip formation, respectively. Based on the level of bending due to the chip generation at the cutting edge and deflection by the flute, these models qualitatively investigate relationship of the point angle and flute helix angle on the average chip length. Drilling experiments validate the chip length for spiral and string chip predicted by both models. Several chip breakers for drilling are analyzed. Drilling experiments show the performance of these chip breakers is limited. One new chip breaker is designed and its performance is validated by drilling of the AISI 1018 steel, which is ductile material.
机译：这项研究调查了钻削过程中切屑的排出和形成。分析了不连续切屑的排屑机理，深孔钻削中的切屑增厚，螺旋切屑和串式切屑形成机理以及钻削中的断屑槽。开发了一个分析模型来预测切屑的光滑度，切屑输送的最佳螺旋角以及切屑初始速度对切屑排出的影响。已经进行了钻探实验以验证由模型估计的切屑排出速度和切屑堵塞。观察到整个钻头切削刃上切屑厚度的变化。切屑厚度随钻孔深度而增加。开发了一种分析模型来评估和预测切屑增厚对切削力的影响。基于这种切屑增厚机理，发现深孔钻削中钻削力的增加是由切屑增厚引起的，除了切屑与孔壁摩擦外。切屑厚度和切屑力之间的关系通过钻孔实验得到验证。开发了两种模型来分别预测螺旋形和弦状切屑的形成。这些模型基于切削刃处产生切屑所产生的弯曲程度以及凹槽产生的偏斜，定性地研究了尖角和凹槽螺旋角与平均切屑长度之间的关系。钻探实验验证了两个模型预测的螺旋形和弦形切屑的切屑长度。分析了几种用于钻孔的断屑槽。钻孔实验表明，这些断屑槽的性能受到限制。设计了一种新型断屑槽，并通过对易延展材料AISI 1018钢进行钻孔来验证其性能。

著录项

  • 作者

    Ke, Feng.;

  • 作者单位

    University of Michigan.;

  • 授予单位 University of Michigan.;
  • 学科 Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 2003
  • 页码 132 p.
  • 总页数 132
  • 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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