Efficient Identification of stability lobe diagrams

有效识别稳定性波瓣图

• 批准号: 312052494
• 负责人: Professor Dr.-Ing. Christian Brecher
• 金额: --
• 依托单位: Werkzeugmaschinenlabor - WZL
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/312052494?language=en
• 关键词: Efficient; Identification; stability; lobe; diagrams

The obtainable productivity of modern machine tools is significantly limited by the occurrence of chatter vibrations. Chatter vibrations are self-excited and self-reinforcing regenerative vibrations, resulting from the interactions between process and machine tool. Despite of being the topic of numerous research projects, chattering is still not fully mastered and investigated. Therefore it is necessary to investigate the influences on stability extensively. However, the identification of stability lobes diagrams, which display the limits of stability and its dependency on cutting depth and rotational speed, is elaborate and poorly reproducible. There already exist two different approaches to reduce the experimental effort to identify the diagrams: the continuous variation of the cutting depth and the continuous variation of the rotational speed. However both approaches dispose some disadvantages regarding the experimental effort.The aim of the requested project is to develop a methodology to make the identification of the stability lobes diagrams more efficient, automatable and reproducible. The long term aim is to standardize the determination of stability lobes diagrams. The methodology is based on a combination of the two approaches mentioned above. The novelty is that not only one parameter, but the cutting depth as well as the rotational speed are variated. In this way, the stability limits are determined continuously. In a future second phase of the project it is planned to use the new methodology to investigate possibilities to compensate statistical influences on the identification of stability lobes diagrams.To develop the new methodology first the two existing approaches are further investigated to clarify the boundary conditions. Furthermore a method for the identification of chatter is chosen and advanced. Afterwards the new methodology is realized by combining the two approaches together with the identification-method and validated by experiments on machine tools. Afterwards the results are evaluated.The result of the project is a new experimental methodology to identify stability lobes diagrams efficiently and automated, which enables a simple and extensive investigation of influences on the stability of machine tools. In addition to that the methodology simplifies the identification of optimal process parameters for stable machining.

现代机床的生产率因颤振的发生而受到严重限制。颤振是自激和自增强的再生振动，由过程和机床之间的相互作用产生。尽管颤振是众多研究项目的主题，但仍然没有完全掌握和研究。因此有必要广泛研究其对稳定性的影响。然而，稳定性波瓣图的识别显示了稳定性的极限及其对切削深度和转速的依赖性，这是复杂的且可重复性差。已经存在两种不同的方法来减少识别图表的实验工作：切削深度的连续变化和旋转速度的连续变化。然而，这两种方法在实验工作方面都存在一些缺点。所请求项目的目的是开发一种方法，使稳定性波瓣图的识别更加高效、自动化和可重复。长期目标是标准化稳定性波瓣图的确定。该方法基于上述两种方法的组合。新颖之处在于不仅是一个参数，而且切削深度和转速都是变化的。通过这种方式，可以连续确定稳定性极限。在该项目未来的第二阶段，计划使用新方法来研究补偿稳定性波瓣图识别统计影响的可能性。为了开发新方法，首先进一步研究两种现有方法以澄清边界条件。此外，还选择并提出了一种识别颤振的方法。随后，通过将两种方法与识别方法相结合，实现了新的方法，并通过机床实验进行了验证。然后对结果进行评估。该项目的结果是一种新的实验方法，可以有效、自动化地识别稳定性波瓣图，从而可以简单而广泛地研究对机床稳定性的影响。除此之外，该方法还简化了稳定加工的最佳工艺参数的确定。