直刃尖刀形状对超声辅助切削系统振动性能的影响

Effect of Shape Parameters of Straight Blade Cutter on Performance of Ultrasonic Assisted Cutting System

基于超声振动设计理论并结合超声振动变幅杆,设计了一种用于弱刚度材料超声辅助切割的直刃尖刀。建立了直刃尖刀和超声振动系统一体的有限元模型,系统分析了直刃尖刀刀体长度、厚度参数对超声振动系统谐振频率、振幅放大倍数和刀具纵向振幅的影响,探讨了刀具横向和侧向振幅沿刀具轴线方向的分布规律。针对特定的超声振动系统,确定了综合性能最优的刀具参数。研制了具有不同形状参数的去刃模拟刀具,并安装于同一超声振动系统进行测试,对仿真分析结论进行验证,理论分析与试验结果相一致。根据理论分析确定的最佳参数研制了直刃尖刀并测试了其振动性能。研究结论对超声辅助切削加工的直刃刀尖的研制提供了理论指导。

Based on the theory of ultrasonic vibration design and ultrasonic vibration horn, a straight blade cutter for ultrasonic assisted cutting of weak stiffness material was designed. The influence of length, thickness parameters of the blade oil the resonant frequency, amplitude magnification and longitudinal amplitude of the tool was analyzed. The ef- fects of the tool width and transverse direction and the distribution of lateral amplitude along the tool axis direction were discussed. For the particular ultrasonic vibration system, the tool parameters with the best overall performance were deter- mined. The cutting edge simulation tool with different shape parameters was developed and tested on the same ultrasonic vibration system. The conclusion of the simulation analysis was verified. The theoretical analysis was in accordance with the experimental results. According to the optimum paraineters determined by the theoretical analysis, the straight blade cutter was developed and its vibration performance was tested. The conclusion of the study provided theoretical guidance for the development of straight blade cutter for ultrasonic assisted rnachining.