Process stability of a novel roughing-finishing end mill
Process stability of a novel roughing-finishing end mill
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DOI：
10.1007/s11740-020-00963-y
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发表时间：
2020-06
期刊：
影响因子：
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通讯作者：
B. Denkena;R. Grabowski;A. Krödel;L. Ellersiek
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文献类型：
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作者：
B. Denkena;R. Grabowski;A. Krödel;L. Ellersiek
本文对一种新型粗精立铣刀的稳定性进行了研究。该工具有两个锋利的精加工齿和两个径向凹陷的倒角粗齿。通过使用相同的工具进行粗加工和精加工操作，可以减少刀具更换和加工时间。在稳定性研究方面，扩展了计算稳定性图的半离散化方法，并考虑了倒角切削齿的径向后退，使其适用于新的刀具概念。这是必要的，因为径向后退会导致牙齿啮合过程中的不同时间延迟。然后计算了具有不同径向退缩的粗加工刀具以及常规精加工刀具和粗加工刀具的稳定性图。此外，还绘制了实验稳定性图。结果表明，精加工刀具的稳定性计算结果与实验结果吻合较好。然而，粗加工刀具和粗加工刀具的计算稳定性极限与实验稳定性极限不符，这归因于过程阻尼建模的不准确。然而，计算和实验的稳定性图表表明，与精加工刀具相比，粗加工刀具的稳定性极限有显著提高。
In this paper, stability investigations of a novel roughing-finishing end mill are carried out. This tool possesses two sharp finishing teeth and two radially recessed, chamfered roughing teeth. By applying the same tool for roughing and finishing operations, tool changes and process time can be reduced. For the stability investigations, the semi-discretization method for calculating stability charts was extended and made applicable for the novel tool concept by taking into account the radial recession of the chamfered cutting teeth. This is necessary because the radial recession leads to varying time-delays during the tooth engagement. Stability charts were then calculated for roughing-finishing tools with different radial recession as well as for conventional finishing and roughing tools. Furthermore, experimental stability charts were created. The results show a good agreement between calculated and experimental stability charts for the finishing tool. However, the calculated stability limits of the roughing-finishing tool and the roughing tool do not met with the experimental stability limits, which is attributed to inaccuracies in the modelling of process damping. Nevertheless, calculated as well as experimental stability charts indicate a significant increase of the stability limit of the roughing-finishing tool compared to the finishing tool.