Abstract

Broaching is very efficient for machining complex-shaped slots in turbine disks made of high thermal resistant super-alloys. However, large cutting forces and high thermal flux lead to high tool wear. To reduce the broaching forces, this paper proposes a vibration assisted broaching system, including the main components of a hydraulic horizontal internal broaching machine, an electrohydraulic vibration exciter, a 2-dimensional valve and a control unit. A force measuring structure and vibration signal acquisition module are designed and integrated into the system. By changing the frequency of the active vibration, cutting forces are obtained and analyzed by fast Fourier transformation method. The experimental results show that through the additional imposed vibration, static and dynamic broaching forces are significantly reduced.

摘要

拉削对于加工由高耐热性超级合金制成的涡轮盘上的复杂形状的槽非常有效。但是，较大的切削力和较高的热通量会导致较高的工具磨损。为了减小拉削力，本文提出了一种振动辅助拉削系统，包括液压卧式内部拉床的主要部件，电动液压激振器，二维阀和控制单元。设计了测力结构和振动信号采集模块，并将其集成到系统中。通过改变主动振动的频率，可以通过快速傅里叶变换方法获得并分析切削力。实验结果表明，通过附加施加的振动，静态和动态拉削力显着降低。