基于多自由度被动阻尼器的铣削颤振抑制机理研究

项目名称： 基于多自由度被动阻尼器的铣削颤振抑制机理研究

项目编号： No.51205013

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 机械工程学科

项目作者： 杨毅青

作者单位： 北京航空航天大学

项目金额： 26万元

中文摘要： 再生颤振是导致航空复杂结构件切削效率和零件加工质量降低的主要因素。本项目以航空企业中广泛使用的球头刀、环形刀以及端铣刀为应用对象，研究基于多自由度被动阻尼器的航空复杂结构件铣削颤振抑制技术。相比单自由度以及组合式被动阻尼器，多自由度阻尼器不但附加质量小，而且能同时抑制主结构单个或多个模态的振动；但由于铣削加工的复杂性、再生颤振的特殊性以及加工工艺系统模态之间的相互耦合，多自由度被动阻尼器抑制铣削颤振的优化设计算法尚没有得到解决。此外，铣削颤振被动抑制的实现依赖于准确的颤振稳定域模型。针对线性切削力模型无法预测进给速度对稳定域瓣的影响，以及上述刀具在切削过程中所承受的主轴方向上的切削力较大，容易引发该方向模态的振动，本项目拟研究指数切削力模型下的三维颤振稳定域预测。研究成果有助于提升航空复杂结构件铣削加工的效率及质量，项目选题具有较大的理论创新和工程应用价值。

中文关键词： 铣削；颤振；被动阻尼器；多自由度；

英文摘要： Regenerative chatter is the major factor of efficiency and quality reduction in machining the aero complicated structure parts. The chatter suppression of milling based on multi-degree-of-freedom (MDOF) passive damper is investigated in the project, regarding the ball end mill, toroidal cutter and face mill used in the aero industry. Compared to the single-degree-of-freedom (SDOF) and multiple SDOF passive dampers, the MDOF damper is capable of damping single and multiple modes of the primary structure at the same time, while it requires less additional mass. However, there is currently not any optimization principle for the chatter suppression in milling by MDOF damper, as the complexity of milling physics, the particularity of chatter vibration, and the coupling of multiple modes. Besides, the realization of passive control relies on an accurate chatter stability model. As the stability limit are feed rate independent according to the linear model, the milling chatter stability prediction is extended from the linear to exponential cutting force model. Meanwhile, the above model is extended to three dimensional case, as the cutting force of the above mentioned tools are relatively large in the spindle direction and then excite corresponding modes. The research will contribute to the promotion of milling efficie

英文关键词： milling；chatter；passive damper；multi-degree-of-freedom；