Minimization of torsion vibrations at deep-drilling tools through glued joints with defined damping

枪钻是一种常用的深孔钻削方法，因其加工质量较好而被广泛采用。然而，由于刀具的薄几何形状，特别是在高进给速度下，可能会出现扭转振动，从而限制了工艺的生产率。因此，仍在努力开发合适的阻尼器，以提高该工艺的生产率。然而，之前的发展未能在市场上获得认可。这其中的原因是，一些阻尼器的效果有限，或者在受控系统的情况下，它们的成本很高，而且它们的复杂性。初步试验表明，夹紧套筒和工具柄之间的粘接而不是焊接界面可能会产生减振，因此对工具的动态稳定性有积极的影响。该项目的目的是系统地评估粘结枪钻削工具的静态和动态性能，以及它们对钻孔过程和由此产生的加工质量的影响。另一个目的是建立粘结工具的有限元模型，以检查和预测粘合工具的阻尼及其对工艺的影响，这取决于粘结剂的特性以及粘结层的厚度。此外，还将确定不同类型和种类的粘合剂的减振机制，以便于进行特定的优化。共有五种不同的胶粘剂(厌氧胶、单组分以及双组分环氧树脂胶粘剂)将用于此。

Gun drilling is a deep hole drilling method often used owing to the attainable machining quality. Torsional vibrations, limiting the productivity of the process, may however arise especially at high feed rates due to the slim geometry of the tools. Hence, the development of suitable dampers is still being worked on to increase the productivity of the process. Previous developments, however, could not gain acceptance on the market. The reasons for that are, among other things, the limited effectiveness of some dampers or in the case of controlled systems, their high costs as well as their complexity.Preliminary tests showed that bonded instead of soldered interfaces between the clamping sleeve and the shank of the tool may have a damping and therefore positive influence on the dynamic stability of the tool. The aim of this project is to systematically assess the static and dynamic behaviour of bonded gun drilling tools and their effects on the drilling process as well as the resulting machining quality. Another aim is to create a finite elements model of the bonded tools for examining and predicting the damping and its effects on the process, depending on the characteristics of the adhesive as well as the thickness of the adhesive layer. In addition, the damping mechanisms occurring for different types and kinds of adhesives will be identified to facilitate a specific optimisation. Altogether five different adhesives (anaerobic adhesive, one-component as well as two-component epoxy resin adhesives) by different manufacturers will be used for this.