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A new procedure for specific cutting force assessment in high-speed end milling.

机译：用于评估高速立铣刀中特定切削力的新程序。

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摘要

High-speed machining (HSM) concepts were developed in response to productivity, quality and cost concerns. Significant advancements in controls and machining technologies have recently come together to enable the wide spread use of HSM on the plant floor. However, with the advancement of HSM technology, dynamic problems associated with modern machine-tool structures have not been fully addressed and are currently limiting performance in some applications.;Thus the focus of this research is to develop a new procedure for predicting the specific cutting forces in the end-milling process for high-speed machining. An improved mechanistic model to predict the specific cutting force using acceleration data captured from the workpiece fixture was developed. The development of the new procedure has also lead to an improvement in the extraction technique used to establish the modal parameters of a machining system. This new extraction technique was found to be more flexible and easier to use than other available techniques.;The new procedure was investigated to test the effect of choosing the number of modes of the improved modal parameters extraction technique on the estimation of the specific cutting force. The effect of filtrating the acceleration signal and the importance of including the run-out of the cutting tool in the model were also investigated.;The new procedure was tested on different setups and with different cutting force models. Experimental validation of the proposed estimation procedure was carried out, analyzed and compared to the open literature. The new procedure was found to be more accurate while being easier to implement.;A key aspect in the modelling of HSM processes is capturing the dynamics of the system during cutting. Machining over a wide range of rotational speeds necessitates the inclusion of many more higher modes in the system than traditionally considered. In addition many of the instruments used to assess performance such as force dynamometers are not designed to measure the cutting forces at high rotational speeds and hence the specific cutting force values being used are often times not being estimated properly.
机译：针对生产率，质量和成本问题，开发了高速加工（HSM）概念。最近，控制和加工技术取得了重大进步，以使HSM在工厂车间得到广泛使用。然而，随着HSM技术的发展，与现代机床结构相关的动态问题尚未得到充分解决，并且目前在某些应用中限制了性能。因此，本研究的重点是开发一种预测特定切削量的新方法在高速加工的立铣刀过程中产生力。开发了一种改进的机械模型，可使用从工件夹具捕获的加速度数据来预测比切削力。新程序的发展也导致了用于建立加工系统模态参数的提取技术的改进。发现该新提取技术比其他可用技术更灵活，更易于使用。;研究了该新程序，以测试选择改进的模态参数提取技术的模式数对比切削力估计的影响。还研究了过滤加速度信号的效果以及在模型中包括切削刀具的跳动的重要性。;在不同的设置和不同的切削力模型下测试了新程序。对所提出的估计程序进行了实验验证，分析并与公开文献进行了比较。发现新过程更准确，同时更易于实施。; HSM过程建模的一个关键方面是捕获切削过程中的系统动态。在大范围的转速上进行机械加工需要在系统中包含比传统方式更多的更高模式。此外，许多用于评估性能的仪器（例如测力计）并未设计为在高转速下测量切削力，因此经常无法正确估算所使用的特定切削力值。

著录项

  • 作者

    Omar, Omar E. E. K. M. H.;

  • 作者单位

    McMaster University (Canada).;

  • 授予单位 McMaster University (Canada).;
  • 学科 Applied Mechanics.;Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 2010
  • 页码 260 p.
  • 总页数 260
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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