The development of the manufacturing-based industries is principally due to the improvement of various machining operations. Experimental studies are important in researches, and their results are also considered useful by the manufacturing industries with their aim to increase quality and productivity. Turning is one of the principal machining processes, and it has been studied since the 20th century in order to prevent machining problems. Chatter or self-excited vibrations represent an important problem and generate the most negative effects on the machined workpiece. To study this cutting process problem, various models were developed to predict stable and unstable cutting conditions. Stability analysis using lobes diagrams became useful to classify stable and unstable conditions. The purpose of this study is to analyze a turning process stability using an analytical model, with three degrees of freedoms, supported and validated with experimental tests results during roughing operations conducted on AU4G1 thin-walled tubular workpieces. The effects of the tubular workpiece thickness, the feed rate and the tool rake angle on the machining process stability will be presented. In addition, the effect of an additional structural damping, mounted inside the tubular workpiece, on the machining process stability will be also studied. It is found that the machining stability process is affected by the tubular workpiece thickness, the feed rate and the tool rake angle. The additional structural damping increases the stability of the machining process and reduces considerably the workpiece vibrations amplitudes. The experimental results highlight that the dynamic behavior of turning process is governed by large radial deformations of the thin-walled workpieces. The influence of this behavior on the stability of the machining process is assumed to be preponderant.

中文翻译：

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AU4G1薄壁管状工件车削过程稳定性分析和实验分析

以制造为基础的工业的发展主要是由于各种机械加工操作的改进。实验研究在研究中很重要，其结果也被制造业认为有用，旨在提高质量和生产力。车削是主要的加工工艺之一，自 20 世纪以来一直在研究它以防止加工问题。颤振或自激振动是一个重要问题，对加工工件产生的负面影响最大。为了研究这个切削过程问题，开发了各种模型来预测稳定和不稳定的切削条件。使用波瓣图的稳定性分析可用于对稳定和不稳定条件进行分类。本研究的目的是使用分析模型分析车削过程的稳定性，该模型具有三个自由度，并在对 AU4G1 薄壁管状工件进行粗加工操作期间得到实验测试结果的支持和验证。将介绍管状工件厚度、进给速度和刀具前角对加工过程稳定性的影响。此外，还将研究安装在管状工件内部的附加结构阻尼对加工过程稳定性的影响。结果表明，加工稳定性过程受管状工件厚度、进给率和刀具前角的影响。额外的结构阻尼提高了加工过程的稳定性，并显着降低了工件的振动幅度。实验结果表明，车削过程的动态行为受薄壁工件的大径向变形控制。这种行为对加工过程稳定性的影响被认为是主要的。