弱刚性薄壁件双转台五轴联动加工稳定性研究

在航空航天工业中，弱刚度薄壁件有着广泛的应用，该类零部件属于典型的薄壁关键零件具有结构复杂、壁薄、刚度弱、表面精度要求高等特点。多轴数控切削加工作为航空航天工业中最主要制造手段，其过程中易产生伴随材料切除的非线性、强时变问题。零件承受的力热载荷，通常会诱发材料微观组织和结构的演变，从而影响后续加工。在实际生产过程中，由于加工参数选择过于保守而导致机床性能难以得到充分发挥的实例屡见不鲜，加工参数选择不当，常常导致切削过程失稳，发生颤振等现象，易引发加工缺陷甚至是加工设备故障的产生，如何实现被该类零件的高效、稳态切削一直以来都是亟需解决的难题。针对弱刚度薄壁件的加工制造过程的工艺系统性能的精准评价，探究加工系统动态特性影响下的切削稳定性问题对解决该类零件加工周期长、加工易变形和加工质量难以控制的问题，最终实现高质量、高效率切削加工有着极重要的意义。

Weak stiffness thin-walled components are widely used in aerospace industry. These components are typical thin-walled key parts with complex structure, thin wall, weak stiffness and high surface accuracy requirements. As the most important manufacturing method in aerospace industry, multi-axis NC cutting is prone to produce non-linear and time-varying problems associated with material removal. The mechanical and thermal loads on parts usually induce the evolution of the microstructure and structure of materials. This phenomenon will affect subsequent processing. In the actual production process, it is common that the performance of machine tools can not be fully developed due to the conservative selection of processing parameters. The improper selection of processing parameters often leads to instability and chatter in the cutting process. This phenomenon is extremely prone to cause processing defects and even faults of processing equipment. How to realize the high-efficiency and steady-state cutting of this kind of parts has always been a difficult problem to be solved urgently. Therefore, for the thin-walled parts with weak stiffness, the precise evaluation of the process system performance in the manufacturing process and studying on cutting stability under the influence of dynamic characteristics of machining system are of great significance solve the problems of long processing cycle, difficult control of processing deformation and quality of this kind of parts. They will help to achieve high quality and high efficiency cutting.