Kinematic Model for Ultrasonic-Assisted Manufacturing of Bore Holes with Undefined Cutting Edges
Kinematic Model for Ultrasonic-Assisted Manufacturing of Bore Holes with Undefined Cutting Edges
复制标题
超声波辅助制造具有未定义切削刃的钻孔的运动学模型
DOI：
10.4028/www.scientific.net/amr.223.794
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
J. Twiefel
中科院分区：
文献类型：
--
作者：
U. Heisel;R. Eber;J. Wallaschek;J. Twiefel
混合加工代表了生产技术进步的可能性。作为混合加工工艺的一部分，超声辅助加工通常用于制造难以加工的材料，因为过程力可以显着降低，材料去除率（MRR）可以提高。本文介绍了一种方法，用于超声辅助钻削模型不确定的切削刃。理论上，超声振动可以沿轴向、切向或径向施加，或者可以叠加。在所提出的模型中，选择了平行于进给方向的轴向激励。由于钻孔与高频振动叠加，因此颗粒的轨迹被修改。因此，建立了一个解析运动学模型，其特征在于刀具和工件的周期性接触损失。由于改进的运动学，除了传统的切割参数外，工艺特定的参数（例如冲击速度或振动与切割速度之间的比率）也很重要。这样的工艺参数是有用的描述占主导地位的材料去除机制，在超声辅助加工。此外，本文还提出了两种刀具形貌模型。基于分析方法，材料去除率，通过将单个颗粒去除量相加来计算。所开发的模型的质量进行了验证，通过进给速度和刀具截面的材料去除率的标准计算。结果表明，它必须考虑到，颗粒不击中一个均匀的表面。粮食分配也是一个重要方面。
Hybrid machining represents a possibility for technological progress in production. As a part of hybrid machining processes, ultrasonic-assisted machining is often used to manufacture materials that are difficult to machine since process forces can be significantly reduced and the material removal rate (MRR) can be increased. This paper describes an approach for a model for ultrasonic-assisted drilling with undefined cutting edges. The ultrasonic vibration can theoretically be applied in axial, tangential or radial direction or it can be superimposed. An axial excitation, parallel to the feed direction, is selected in the presented model. Since the drilling is superimposed with a high-frequency vibration, the trajectories of the grains are modified. Therefore, an analytical-kinematic model is established, which is characterised by a periodical contact loss of tool and workpiece. Due to the modified kinematics, process-specific parameters, such as impact velocity or the ratio between vibration and cutting speed, are important, in addition to conventional cutting parameters. Such process parameters are useful to describe dominant material removal mechanisms in ultrasonic-assisted machining. Moreover, two models on tool topography are presented in this paper. Based on an analytical approach, the material removal rate, established by adding up the individual grain removals, is calculated. The quality of the developed models is validated by the standard calculation of the material removal rate by feed rate and tool cross section. The results show, that it must be taken into account that the grains do not hit an even surface. The grain distribution is also an important aspect.
影响因子：
4.1
作者：
Brinksmeier, E.;Aurich, J. C.;Wittmann, M.
通讯作者：
Wittmann, M.