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首页> 外文学位 >Wear of nanostructured tool coatings bonded to turning inserts dry turning a tantalum tungsten alloy.
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Wear of nanostructured tool coatings bonded to turning inserts dry turning a tantalum tungsten alloy.

机译：与车削刀片结合的纳米结构工具涂层的磨损会导致钽钨合金的干车削。

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摘要

The machining of tantalum alloys using nanostructured coatings bonded to tungsten carbide turning inserts are investigated and presented in this thesis. Turning experiments were conducted on an alloy composed of 98 wt.% tantalum and 2 wt.% tungsten, and tool wear was quantified at moderate cutting speeds. A post-test only experimental design was used to compare the effect of PVD coated tools against an uncoated tool. Surface roughness experiments were compared to theoretical values at various depths of cut, cutting speed, and feed rate. Experimental data was compiled to quantify tool wear and compared to known wear mechanisms. High-speed video recordings of the machining operation were analyzed to determine the mechanisms of chip formation in addition to tool life and tool wear. Titanium-based coatings were found to extend the tool life when compared to an uncoated tool. Measured surface roughness was found to be higher than the calculated theoretical values. The wear mechanisms were classified as chipping and notch wear when machining this particular alloy. The existence of a built-up edge was prevalent during the machining experiments, and the machining chips collected during the analysis were compared to existing chip formation models. A high-speed video montage of the metal chips leads the author to designate a new mechanism of chip formation when machining this particular alloy and is known as the 'continual capricious chip formation mechanism', which is described in section 5.4. The thesis has shown that the machining of this tantalum alloy machines unlike any other metal alloy as discussed in the literature.
机译：本文研究并介绍了使用结合到碳化钨车削刀片上的纳米结构涂层加工钽合金的方法。在由98％（重量）的钽和2％（重量）的钨组成的合金上进行车削实验，并以中等切削速度对工具的磨损进行了定量。仅后测试的实验设计用于比较PVD涂层工具与未涂层工具的效果。在各种切削深度，切削速度和进给速率下，将表面粗糙度实验与理论值进行了比较。收集实验数据以量化工具磨损并将其与已知的磨损机制进行比较。分析了加工操作的高速录像，以确定除刀具寿命和刀具磨损之外的切屑形成机理。与未经涂层的工具相比，发现钛基涂层可以延长工具寿命。发现测得的表面粗糙度高于计算的理论值。在加工这种特殊合金时，磨损机理可分为碎裂和缺口磨损。在机加工实验中普遍存在积屑瘤边缘，并将在分析过程中收集的机加工切屑与现有切屑形成模型进行了比较。金属切屑的高速视频剪辑使作者在加工这种特殊合金时指定了一种新的切屑形成机理，这被称为“连续反复变化的切屑形成机理”，这将在5.4节中介绍。论文表明，这种钽合金机床的加工不同于文献中讨论的任何其他金属合金。

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  • 作者

    Burgess, John W.;

  • 作者单位

    Purdue University.;

  • 授予单位 Purdue University.;
  • 学科 Engineering Mechanical.;Engineering Materials Science.
  • 学位 M.S.
  • 年度 2009
  • 页码 145 p.
  • 总页数 145
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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